WO2016121966A1 - 変倍光学系、光学機器及び変倍光学系の製造方法 - Google Patents
変倍光学系、光学機器及び変倍光学系の製造方法 Download PDFInfo
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- WO2016121966A1 WO2016121966A1 PCT/JP2016/052762 JP2016052762W WO2016121966A1 WO 2016121966 A1 WO2016121966 A1 WO 2016121966A1 JP 2016052762 W JP2016052762 W JP 2016052762W WO 2016121966 A1 WO2016121966 A1 WO 2016121966A1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
- G02B15/1455—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being negative
- G02B15/145523—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being negative arranged -++-+
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/146—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having more than five groups
- G02B15/1465—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having more than five groups the first group being negative
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
- G02B27/0037—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration with diffracting elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
- G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/60—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having five components only
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Definitions
- the present invention relates to a variable magnification optical system, an optical apparatus, and a method for manufacturing the variable magnification optical system.
- JP 2014-160229 A Japanese Patent Laid-Open No. 11-231220
- variable power optical systems are required to satisfy both good optical performance and a wide angle of view or a small F-number.
- a variable magnification optical system includes a first lens group having a negative refractive power, a second lens group, a third lens group, and a negative refractive power, which are arranged in order from the object side.
- a fourth lens group and a fifth lens group having a positive refractive power; an interval between the first lens group and the second lens group; and a distance between the second lens group and the third lens group.
- the zoom lens performs zooming by changing an interval, an interval between the third lens group and the fourth lens group, and an interval between the fourth lens group and the fifth lens group.
- a forty-second lens group configured to be movable so as to have a component perpendicular to the optical axis; and a forty-first lens group disposed on the object side of the forty-second lens group.
- a variable magnification optical system includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a positive refractive power arranged in order from the object side.
- the fourth lens group includes a forty-second lens group configured to be movable so as to have a component in a direction perpendicular to the optical axis, and is disposed on the object side of the forty-second lens group. And a forty-first lens group whose position is stationary.
- An optical apparatus includes the above-described variable magnification optical system.
- a variable magnification optical system manufacturing method includes a first lens group having negative refractive power, a second lens group, a third lens group, and a negative lens, which are arranged in order from the object side. And a fifth lens group having a positive refractive power, an interval between the first lens group and the second lens group, and the second lens group and the second lens group.
- a variable power optical system that performs zooming by changing a distance between three lens groups, a distance between the third lens group and the fourth lens group, and a distance between the fourth lens group and the fifth lens group.
- the fourth lens group is configured to be movable so as to have a component in a direction perpendicular to the optical axis, and the fourth lens group is disposed on the object side of the forty-second lens group.
- Each lens is arranged in a lens barrel so as to have 41 lens groups.
- a variable magnification optical system manufacturing method includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, arranged in order from the object side, and a positive lens.
- a 42nd lens group configured to be movable so that the fourth lens group has a component in a direction perpendicular to the optical axis, and an object side of the 42nd lens group.
- Each lens is arranged in the lens barrel so as to have a forty-first lens group that is arranged at a position that does not move in the direction perpendicular to the optical axis during image blur correction.
- a variable magnification optical system includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group arranged in order from the object side. And a fourth lens group and a fifth lens group having a positive refractive power, a distance between the first lens group and the second lens group, and the second lens group and the third lens group. And changing the distance between the third lens group and the fourth lens group, and the distance between the fourth lens group and the fifth lens group.
- D34T an air space between the third lens group and the fourth lens group in the telephoto end state
- D34W an air gap between the third lens group and the fourth lens group in the wide-angle end state
- D23T an air gap between the second lens group and the third lens group in the telephoto end state
- D23W an air space between the second lens group and the third lens group in the wide-angle end state
- f4 focal length of the fourth lens group
- f3 focal length of the third lens group.
- a variable magnification optical system includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group arranged in order from the object side. And a fourth lens group having a negative refractive power and a fifth lens group having a positive refractive power, and performing zooming by changing the interval between the lens groups. At least a part is configured to be movable so as to have a component perpendicular to the optical axis, and the following conditional expression is satisfied.
- D34T an air space between the third lens group and the fourth lens group in the telephoto end state
- D34W an air gap between the third lens group and the fourth lens group in the wide-angle end state
- D23T an air gap between the second lens group and the third lens group in the telephoto end state
- D23W an air space between the second lens group and the third lens group in the wide-angle end state
- f4 focal length of the fourth lens group
- f3 focal length of the third lens group.
- An optical apparatus includes the above-described variable magnification optical system.
- a variable magnification optical system manufacturing method includes a first lens group having negative refractive power, a second lens group having positive refractive power, arranged in order from the object side, A third lens group, a fourth lens group, and a fifth lens group having a positive refractive power, an interval between the first lens group and the second lens group, and the second lens group and the second lens group.
- a variable power optical system that performs zooming by changing a distance between three lens groups, a distance between the third lens group and the fourth lens group, and a distance between the fourth lens group and the fifth lens group.
- a manufacturing method of the system wherein at least a part of the fourth lens group is configured to be movable so as to have a component in a direction perpendicular to the optical axis, and in the lens barrel so as to satisfy the following conditional expression: Arrange each lens.
- D34T an air space between the third lens group and the fourth lens group in the telephoto end state
- D34W an air gap between the third lens group and the fourth lens group in the wide-angle end state
- D23T an air gap between the second lens group and the third lens group in the telephoto end state
- D23W an air space between the second lens group and the third lens group in the wide-angle end state
- f4 focal length of the fourth lens group
- f3 focal length of the third lens group.
- a variable magnification optical system manufacturing method includes a first lens group having negative refractive power, a second lens group having positive refractive power, arranged in order from the object side, A variable power optical system having three lens groups, a fourth lens group having negative refractive power, and a fifth lens group having positive refractive power, and performing zooming by changing the interval between the lens groups And at least a part of the fourth lens group is configured to be movable so as to have a component in a direction perpendicular to the optical axis, and in each lens barrel so as to satisfy the following conditional expression: Place the lens.
- D34T an air space between the third lens group and the fourth lens group in the telephoto end state
- D34W an air gap between the third lens group and the fourth lens group in the wide-angle end state
- D23T an air gap between the second lens group and the third lens group in the telephoto end state
- D23W an air space between the second lens group and the third lens group in the wide-angle end state
- f4 focal length of the fourth lens group
- f3 focal length of the third lens group.
- a variable magnification optical system includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a positive refractive power arranged in order from the object side.
- changing the distance between the fifth lens group and the sixth lens group, and at least one of the lens groups of the first lens group to the sixth lens group is changed.
- a part is configured to be movable so as to have a component perpendicular to the optical axis.
- a variable magnification optical system includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a positive refractive power arranged in order from the object side.
- the zooming is performed, and at least a part of any one of the first to sixth lens groups is configured to be movable so as to have a component perpendicular to the optical axis.
- An optical apparatus includes the above-described variable magnification optical system.
- a variable magnification optical system manufacturing method includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, arranged in order from the object side, and a positive lens.
- a method of manufacturing a zoom optical system that performs zooming by changing an interval between the fifth lens group and an interval between the fifth lens group and the sixth lens group, wherein the first lens group to the first lens group Move so that at least a part of any of the 6 lens groups has a component perpendicular to the optical axis.
- placing each lens in the lens barrel placing each lens in the lens barrel.
- a variable magnification optical system manufacturing method includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, arranged in order from the object side, and a positive lens.
- a method of manufacturing a variable power optical system that performs variable power by changing, wherein at least a part of any one of the first lens group to the sixth lens group is a component perpendicular to the optical axis.
- Each lens is arranged in the lens barrel so as to be movable so as to have.
- (W), (M), and (T) are cross-sectional views of the zoom optical system according to the first example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
- (A), (b), and (c) are various aberration diagrams at the time of focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the first example. is there.
- (A), (b), and (c) are graphs showing various aberrations when focusing on the close-up distance in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system according to the first example. is there.
- FIG. (W), (M), and (T) are cross-sectional views of the zoom optical system according to the second example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
- (A), (b), and (c) are various aberration diagrams during focusing at infinity in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system according to the second example. is there.
- FIG. (W), (M), and (T) are sectional views of the zoom optical system according to the third example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
- (A), (b), and (c) are various aberration diagrams at the time of focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the third example. is there.
- (A), (b), and (c) are graphs showing various aberrations when focusing on the close-up distance in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system according to the third example. is there.
- (A), (b), and (c) perform image blur correction at the time of focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the third example.
- (W), (M), and (T) are cross-sectional views of the zoom optical system according to the fourth example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
- (A), (b), and (c) are various aberration diagrams during focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the fourth example. is there.
- (A), (b), and (c) are graphs showing various aberrations when focusing on the close-up distance in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the zoom optical system according to the fourth example. is there.
- FIG. (W), (M), and (T) are cross-sectional views of the zoom optical system according to the fifth example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
- (A), (b), and (c) are various aberration diagrams during focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the fifth example. is there.
- FIG. (W), (M), and (T) are sectional views of the zoom optical system according to the sixth example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
- (A), (b), and (c) are various aberration diagrams at the time of focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the sixth example. is there.
- (A), (b), and (c) are graphs showing various aberrations when focusing on the close-up distance in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the sixth example. is there.
- (A), (b), and (c) perform image blur correction at the time of focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the sixth example.
- (W), (M), and (T) are sectional views of the zoom optical system according to the seventh example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
- (A), (b), and (c) are various aberration diagrams at the time of focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the seventh example. is there.
- (A), (b), and (c) are graphs showing various aberrations when focusing on the close-up distance in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the seventh example. is there.
- FIG. (W), (M), and (T) are sectional views of the variable magnification optical system according to the eighth example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
- (A), (b), and (c) are various aberration diagrams at the time of focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the eighth example. is there.
- FIG. It is a figure which shows an example of a structure of the camera carrying a variable magnification optical system. It is a figure which shows the outline of an example of the manufacturing method of a variable magnification optical system.
- FIG. 1 shows an example of the configuration of the variable magnification optical system ZL.
- the number of lens groups, the lens configuration in each lens group, and the like can be changed as appropriate.
- variable magnification optical system includes a first lens group G1 having a negative refractive power, a second lens group G2, a third lens group G3, and a negative refractive power arranged in order from the object side.
- the fourth lens group is changed by changing the distance between the third lens group G3 and the fourth lens group G4, and the distance between the fourth lens group G4 and the fifth lens group G5.
- G4 includes a forty-second lens group G42 configured to be movable so as to have a component perpendicular to the optical axis, and a forty-first lens group G41 disposed on the object side of the forty-second lens group G42.
- at least one of the second lens group G2 and the third lens group G3 can have a positive refractive power.
- variable magnification optical system ZL has a first lens group G1 having a negative refractive power, a second lens group G2 having a positive refractive power, and a positive refractive power arranged in order from the object side. It has a third lens group G3, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power, and zooming is performed by changing the interval between the lens groups.
- the fourth lens group G4 as the anti-vibration lens group VR, is configured to be movable so as to have a component perpendicular to the optical axis in order to correct image blur, and the forty-second lens group G42. And a forty-first lens group G41 whose position in the direction perpendicular to the optical axis does not move during image blur correction.
- a variable magnification optical system having a wide angle of view can be realized by having negative, positive, positive, and positive lens groups and changing the interval between the groups.
- the fourth lens group G4 includes a 41st lens group G41 and a 42nd lens group G42 arranged in order from the object side, and the 42nd lens group G42 has a component perpendicular to the optical axis.
- the 41st lens group G41 may have a positive refractive power or a negative refractive power.
- the fourth lens group G4 may have one or more lenses (non-moving during image blur correction) on the image side of the forty-second lens group G42.
- the forty-second lens group G42 has negative refractive power.
- the forty-second lens group G42 By giving the forty-second lens group G42 a negative refractive power, decentration aberration, particularly when the forty-second lens group G42 is moved so as to have a component perpendicular to the optical axis in order to correct image blurring, It is possible to satisfactorily correct the occurrence of decentration coma and the tilting of the image plane (single blur).
- variable magnification optical system ZL preferably satisfies the following conditional expression (1). 0.700 ⁇ f42 / f4 ⁇ 1.700 (1)
- f42 focal length of the forty-second lens group G42
- f4 focal length of the fourth lens group G4.
- Conditional expression (1) is a conditional expression for defining the focal length of the forty-second lens group G42 which is the anti-vibration lens group VR with respect to the focal length of the fourth lens group G4.
- conditional expression (1) If the upper limit value of conditional expression (1) is exceeded, the focal length of the forty-second lens group G42 becomes longer, and the amount of movement of the forty-second lens group G42 during image blur correction becomes too large. For this reason, the image blur correction mechanism may be increased in size.
- conditional expression (1) is 1.600. In order to ensure the effect, it is preferable that the upper limit value of the conditional expression (1) is 1.500.
- conditional expression (1) If the lower limit value of conditional expression (1) is not reached, the focal length of the forty-second lens group G42 will be shortened, and the occurrence of decentered coma aberration or one-sided blur that occurs during image blur correction will increase, resulting in good results during image blur correction. Image performance cannot be maintained.
- the lower limit value of conditional expression (1) is 0.800. In order to ensure the effect, it is preferable that the lower limit value of conditional expression (1) is 0.900.
- variable magnification optical system ZL preferably satisfies the following conditional expression (2). -0.400 ⁇ f4 / f41 ⁇ 0.500 (2) However, f4: focal length of the fourth lens group G4, f41: Focal length of the forty-first lens group G41.
- Conditional expression (2) is a conditional expression for defining the focal length of the forty-first lens group G41 with respect to the focal length of the fourth lens group G4.
- the conditional expression (2) is satisfied, the amount of movement of the forty-second lens group G42 to be moved at the time of image blur correction can be made appropriate while improving the image forming performance at the time of image blur correction.
- conditional expression (2) If the upper limit of conditional expression (2) is exceeded, the negative refractive power of the forty-first lens group G41 will increase, and the refractive power of the forty-second lens group G42 will become relatively weak. As a result, the amount of movement of the forty-second lens group G42 during image blur correction becomes too large, and the image blur correction mechanism becomes large.
- conditional expression (2) is 0.400. In order to ensure the effect, it is preferable to set the upper limit value of conditional expression (2) to 0.300.
- conditional expression (2) When the lower limit value of conditional expression (2) is not reached, the positive refractive power of the forty-first lens group G41 becomes large, and the negative refractive power of the forty-second lens group G42 becomes relatively strong. As a result, the occurrence of decentration coma or one-sided blur that occurs at the time of image blur correction increases, and good imaging performance cannot be maintained at the time of image blur correction.
- conditional expression (2) In order to ensure the effect, it is preferable to set the lower limit value of conditional expression (2) to ⁇ 0.300. In order to ensure the effect, it is preferable that the lower limit value of the conditional expression (2) is set to ⁇ 0.200.
- variable magnification optical system ZL preferably satisfies the following conditional expression (3). 0.200 ⁇ f1 / f4 ⁇ 0.900 (3) However, f1: Focal length of the first lens group G1 f4: focal length of the fourth lens group G4.
- Conditional expression (3) is a conditional expression for satisfactorily correcting curvature of field and coma aberration while obtaining a wide angle of view (a half angle of view of about 50 ° or more) in the wide-angle end state.
- conditional expression (3) If the upper limit value of conditional expression (3) is exceeded, the focal length of the first lens group G1 becomes long, and it becomes difficult to obtain a wide angle of view (a half angle of view of about 50 ° or more) in the wide angle end state. Alternatively, the total lens length and the lens diameter of the first lens group G1 are increased, which is not preferable.
- conditional expression (3) In order to ensure the effect, it is preferable to set the upper limit value of conditional expression (3) to 0.750. In order to ensure the effect, it is preferable that the upper limit value of conditional expression (3) is 0.600.
- conditional expression (3) If the lower limit value of conditional expression (3) is not reached, the focal length of the first lens group G1 becomes short, and it becomes difficult to correct curvature of field and coma, making it impossible to achieve good imaging performance.
- the lower limit value of conditional expression (3) is 0.300. In order to ensure the effect, it is preferable that the lower limit value of conditional expression (3) is 0.350.
- the forty-first lens group G41 can preferably include a negative lens and a positive lens.
- the forty-second lens group G42 can be preferably composed of a cemented lens of a positive lens and a negative lens.
- This configuration is effective for correcting decentration coma and one-sided blur when the forty-second lens group G42 is moved for image blur correction.
- the moving lens for image blur correction can be made small and light, and it is effective for downsizing the image blur correction mechanism and the entire lens system.
- the forty-second lens group G42 is not limited to the configuration in which the positive lens and the negative lens are cemented as described above, but may be configured to include two lenses (peeled off at the cemented surface).
- the most image side lens surface of the forty-second lens group G42 is an aspherical surface.
- This configuration is effective for correcting decentration coma and one-sided blur when the forty-second lens group G42 is moved for image blur correction.
- variable magnification optical system ZL preferably satisfies the following conditional expression (4). 1.100 ⁇ A (T3.5) / A (T4.0) ⁇ 5.000 (4) However, A (T3.5): On the point where the axial ray corresponding to the F value of F / 3.5 in the telephoto end state passes through the aspherical surface formed on the lens surface closest to the image side of the forty-second lens group G42. Aspheric amount, A (T4.0): An axial ray corresponding to an F value of F / 4.0 in the telephoto end state passes through an aspherical surface formed on the lens surface closest to the image side of the forty-second lens group G42. Aspheric amount. The aspheric amount is an amount obtained by measuring the sag amount of the aspheric surface with respect to the approximate spherical surface along the optical axis on the aspheric optical axis.
- Conditional expression (4) is a conditional expression for defining an appropriate value of the amount of aspherical surface on the most aspherical surface on the image side of the forty-second lens group G42.
- conditional expression (4) In order to ensure the effect, it is preferable to set the upper limit of conditional expression (4) to 4.000. In order to ensure the effect, it is preferable that the upper limit value of conditional expression (4) is 3.000.
- conditional expression (4) is 1.250. In order to ensure the effect, it is preferable that the lower limit value of the conditional expression (4) is 1.400.
- the first lens group G1 is fixed with respect to the image plane during zooming.
- This configuration is effective for simplifying the zoom movement mechanism and making the lens barrel robust.
- variable magnification optical system ZL can preferably perform focusing by moving the second lens group G2 in the optical axis direction as the focusing lens group.
- the focusing lens group can be reduced in size and weight, and the entire lens system can be reduced in size and the focusing speed during autofocusing can be increased.
- variable magnification optical system ZL having a wide angle of view and excellent correction of various aberrations.
- FIG. 33 shows an example of the configuration of a camera equipped with a variable magnification optical system.
- the camera 1 is an interchangeable lens camera (so-called mirrorless camera) provided with the above-described variable magnification optical system ZL as the photographing lens 2.
- this camera 1 light from an object (not shown) that is not shown is condensed by the taking lens 2, and then on the image pickup surface of the image pickup unit 3 via an OLPF (Optical Low Pass Filter) that is not shown.
- a subject image is formed on the screen.
- the subject image is photoelectrically converted by the photoelectric conversion element provided in the imaging unit 3 to generate an image of the subject.
- This image is displayed on an EVF (Electronic view finder) 4 provided in the camera 1.
- EVF Electronic view finder
- variable magnification optical system ZL mounted on the camera 1 as the photographic lens 2 has a wide angle of view and various aberrations are corrected satisfactorily by its characteristic lens configuration, as will be understood from each example described later. Have excellent optical performance. Therefore, according to the camera 1, it is possible to realize an optical apparatus having a wide angle of view, various aberrations being favorably corrected, and good optical performance.
- the example of the mirrorless camera was demonstrated as the camera 1, it is not limited to this.
- the above zooming optical system ZL is mounted on a single-lens reflex camera that has a quick return mirror in the camera body and observes a subject with a viewfinder optical system, the same effect as the camera 1 can be obtained. Can do.
- variable magnification optical system ZL an example of a manufacturing method of the above-described variable magnification optical system ZL will be outlined.
- 34 and 35 show an example of a manufacturing method of the variable magnification optical system ZL.
- the zooming is performed by changing the distance between the third lens group G3, the distance between the third lens group G3 and the fourth lens group G4, and the distance between the fourth lens group G4 and the fifth lens group G5.
- Each lens is arranged (step ST1).
- the fourth lens group G4 includes a forty-second lens group G42 configured to be movable so as to have a component perpendicular to the optical axis, and a forty-first lens group G41 disposed on the object side of the forty-second lens group G42.
- each lens is arranged (step ST2).
- a first lens group G1 having negative refracting power, a second lens group G2 having positive refracting power, and a positive refracting lens which are arranged in order from the object side in the lens barrel.
- a third lens group G3 having a refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power are changed by changing the interval between the lens groups.
- Each lens is arranged so as to double the magnification (step ST10).
- the fourth lens group G4 is arranged on the object side of the forty-second lens group G42 and the forty-second lens group G42 configured to be movable so as to have a component perpendicular to the optical axis in order to correct the image blur.
- Each lens is arranged so as to have the forty-first lens group G41 whose position in the vertical direction with respect to the optical axis does not move during correction (step ST20).
- a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 are arranged in order from the object side.
- the first lens group G1 and a biconvex lens L21, a cemented lens of a negative meniscus lens L22 having a concave surface on the image side and a positive meniscus lens L23 having a convex surface on the object side are arranged to form a second lens group G2.
- a cemented lens of a biconvex lens L31 and a negative meniscus lens L32 having a concave surface facing the object side is arranged as a third lens group G3, and a biconcave lens L41, a biconvex lens L42, a biconcave lens L43, and a convex surface on the object side.
- a fourth lens group G4 which is a biconvex lens L51, a biconvex lens L52, and a biconcave lens L5.
- a cemented lens of a, and the fifth lens group G5 are arranged a cemented lens of a biconvex lens L54 and a biconcave lens L55.
- the fourth lens group G4 includes a biconcave lens L41 to a biconvex lens L42 as a forty-first lens group G41, and a cemented lens of a biconcave lens L43 and a positive meniscus lens L44 having a convex surface facing the object side. Vibration lens group VR).
- the lens groups thus prepared are arranged in the above-described procedure to manufacture the variable magnification optical system ZL.
- variable magnification optical system ZL having a wide angle of view and having various aberrations corrected satisfactorily.
- variable magnification optical system ZL ZL1 to ZL2
- W wide-angle end state
- T telephoto end state
- M intermediate focal length state
- variable magnification optical systems ZL1 to ZL2 At the top of the cross-sectional view of the variable magnification optical systems ZL1 to ZL2, the moving direction of the focusing lens group when focusing on an object at a close distance from infinity is indicated by an arrow, and the image stabilizing lens group for correcting image blurring The state of VR is also shown.
- each reference symbol for FIG. 1 according to the first embodiment is used independently for each embodiment in order to avoid complication of explanation due to an increase in the number of digits of the reference symbol. Therefore, even if the same reference numerals as those in the drawings according to the other embodiments are given, they are not necessarily in the same configuration as the other embodiments.
- Tables 1 and 2 are shown below, but these are tables of specifications in the first to second embodiments.
- d-line (wavelength 587.562 nm) and g-line (wavelength 435.835 nm) are selected as the calculation targets of the aberration characteristics.
- the surface number is the order of the optical surfaces from the object side along the light traveling direction
- R is the radius of curvature of each optical surface
- D is the next optical surface from each optical surface ( Or an optical surface distance to the image surface)
- nd is a refractive index of the material of the optical member with respect to the d-line
- ⁇ d is an Abbe number based on the d-line of the material of the optical member.
- (Di) indicates the surface interval between the i-th surface and the (i + 1) -th surface
- (aperture stop) indicates the aperture stop S.
- the optical surface is an aspherical surface
- the surface number is marked with *
- the column of curvature radius R indicates the paraxial curvature radius.
- f is the focal length of the entire lens system
- FNo is the F number
- ⁇ is the half angle of view (unit: °)
- Y is the maximum image height
- BF is the optical axis at the time of focusing on infinity.
- the distance from the last lens surface to the image surface I is expressed in terms of air length.
- TL is the distance from the front lens surface to the last lens surface on the optical axis when focusing on infinity. Each one is shown.
- Di is the surface distance between the i-th surface and the (i + 1) -th surface
- D0 is the axial air space between the object surface and the lens surface closest to the object side of the first lens group G1
- f represents the focal length of the entire lens system
- ⁇ represents the photographing magnification.
- mm is generally used for the focal length f, the radius of curvature R, the surface interval D, and other lengths, etc. unless otherwise specified.
- the optical system is not limited to this because the same optical performance can be obtained even when proportional expansion or proportional reduction is performed.
- the unit is not limited to “mm”, and other appropriate units can be used.
- variable magnification optical system ZL (ZL1) includes a first lens group G1 having negative refractive power arranged in order from the object side, and a first lens group having positive refractive power.
- the second lens group G2 includes a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.
- the first lens group G1 is composed of a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 arranged in order from the object side.
- the negative meniscus lens L11 has two aspheric surfaces.
- the biconcave lens L12 has an aspheric object side surface.
- the second lens group G2 includes a biconvex lens L21 arranged in order from the object side, a cemented lens of a negative meniscus lens L22 having a concave surface facing the image side, and a positive meniscus lens L23 having a convex surface facing the object side.
- the third lens group G3 is composed of a cemented lens composed of a biconvex lens L31 and a negative meniscus lens L32 having a concave surface directed toward the object side, which are arranged in order from the object side.
- the fourth lens group G4 is composed of a 41st lens group G41 having negative refractive power and a 42nd lens group G42 having negative refractive power, which are arranged in order from the object side.
- the forty-first lens group G41 is composed of a biconcave lens L41 and a biconvex lens L42 arranged in this order from the object side.
- the forty-second lens group G42 is composed of a cemented lens composed of a biconcave lens L43 and a positive meniscus lens L44 having a convex surface directed toward the object side.
- the positive meniscus lens L44 has an aspheric image side surface.
- the fifth lens group G5 includes a biconvex lens L51, a cemented lens of a biconvex lens L52 and a biconcave lens L53, and a cemented lens of a biconvex lens L54 and a biconcave lens L55, which are arranged in order from the object side.
- the biconcave lens L55 has an aspheric image side surface.
- An aperture stop S is provided between the third lens group G3 and the fourth lens group G4, and the aperture stop S constitutes the fourth lens group G4.
- the zooming from the wide-angle end state to the telephoto end state is performed by changing each lens group interval (the interval between the first lens group G1 and the second lens group G2, the interval between the second lens group G2 and the third lens group G3,
- the first lens group G1 is fixed with respect to the image plane so that the distance between the third lens group G3 and the fourth lens group G4 and the distance between the fourth lens group G4 and the fifth lens group G5 are changed.
- the second lens group G2 is moved to the object side
- the third lens group G3 is moved to the object side
- the fourth lens group G4 is moved to the object side
- the fifth lens group G5 is moved to the object side.
- the aperture stop S is moved to the object side integrally with the fourth lens group G4.
- Focusing from infinity to a close object is performed by moving the second lens group G2 to the image side.
- the image blur correction (anti-vibration) on the image plane I is performed by moving the forty-second lens group G42 as a vibration-proof lens group VR so as to have a component perpendicular to the optical axis.
- the image stabilization coefficient ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction
- K rotational blurring at an angle ⁇
- the 41st lens group G41 located on the object side of the 42nd lens group G42 is fixed at the time of image blur correction.
- the image stabilization coefficient in the wide-angle end state, is ⁇ 0.74 and the focal length is 16.40 mm. Therefore, the image stabilization lens group VR for correcting the rotational blur of 0.81 degrees is used.
- the amount of movement is -0.31 mm.
- the image stabilization coefficient In the intermediate focal length state, the image stabilization coefficient is ⁇ 0.90 and the focal length is 23.50 mm. Therefore, the movement amount of the image stabilization lens group VR for correcting the rotation blur of 0.68 degrees is ⁇ 0. .31 mm.
- the movement amount of the image stabilization lens group VR for correcting the rotation blur of 0.57 degrees is ⁇ 0. 29 mm.
- Table 1 below shows the values of each item in the first example.
- Surface numbers 1 to 32 in Table 1 correspond to the optical surfaces m1 to m32 shown in FIG.
- variable magnification optical system ZL1 satisfies the conditional expressions (1) to (4).
- FIG. 2 is a diagram showing various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) at the time of focusing on infinity of the variable magnification optical system ZL1 according to the first example.
- (A) shows a wide-angle end state
- (b) shows an intermediate focal length state
- (c) shows a telephoto end state.
- FIG. 3 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the zoom optical system ZL1 according to the first example is in close focus.
- FIG. 4A is a wide-angle end state
- FIG. 4B is an intermediate focus.
- the distance state, (c) shows the telephoto end state.
- FNO is the F number
- NA is the numerical aperture
- A is the half field angle (unit: °) with respect to each image height
- H0 is the object height.
- d indicates the d-line
- g indicates the aberration at the g-line.
- those without these descriptions show aberrations at the d-line.
- the value of the F number corresponding to the maximum aperture is shown.
- the numerical aperture value corresponding to the maximum aperture is shown.
- the solid line indicates the sagittal image plane
- the broken line indicates the meridional image plane.
- variable magnification optical system ZL1 has various aberrations from the wide-angle end state to the telephoto end state, and from the infinite focus state to the close-up focus state. It can be seen that it has a good optical performance. Further, it can be seen that the image formation performance is high at the time of image blur correction.
- variable magnification optical system ZL (ZL2) includes a first lens group G1 having negative refractive power arranged in order from the object side, and a first lens group having positive refractive power.
- the second lens group G2 includes a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.
- the first lens group G1 is composed of a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 arranged in order from the object side.
- the negative meniscus lens L11 has two aspheric surfaces.
- the biconcave lens L12 has an aspheric object side surface.
- the second lens group G2 includes a biconvex lens L21 arranged in order from the object side, a cemented lens of a negative meniscus lens L22 having a concave surface facing the image side, and a positive meniscus lens L23 having a convex surface facing the object side.
- the third lens group G3 is composed of a biconvex lens L31.
- the fourth lens group G4 is composed of a 41st lens group G41 having negative refractive power and a 42nd lens group G42 having negative refractive power, which are arranged in order from the object side.
- the forty-first lens group G41 is composed of a biconcave lens L41 and a biconvex lens L42 arranged in this order from the object side.
- the forty-second lens group G42 is composed of a cemented lens composed of a biconcave lens L43 and a positive meniscus lens L44 having a convex surface directed toward the object side.
- the positive meniscus lens L44 has an aspheric image side surface.
- the fifth lens group G5 includes, in order from the object side, a cemented lens of a biconvex lens L51 and a negative meniscus lens L52 having a concave surface facing the object side, a negative meniscus lens L53 and a biconvex lens L54 having a concave surface facing the image side. And a negative meniscus lens L55 having a concave surface facing the object side.
- the negative meniscus lens L55 has an aspheric image side surface.
- An aperture stop S is provided between the third lens group G3 and the fourth lens group G4, and the aperture stop S constitutes the fourth lens group G4.
- the zooming from the wide-angle end state to the telephoto end state is performed by changing each lens group interval (the interval between the first lens group G1 and the second lens group G2, the interval between the second lens group G2 and the third lens group G3,
- the first lens group G1 is temporarily moved to the image side so that the distance between the third lens group G3 and the fourth lens group G4 and the distance between the fourth lens group G4 and the fifth lens group G5 are changed.
- the second lens group G2 is moved to the object side
- the third lens group G3 is moved to the object side
- the fourth lens group G4 is moved to the object side
- the fifth lens group G5 is moved to the object side. This is done by moving to the object side.
- the aperture stop S is moved to the object side integrally with the fourth lens group G4.
- Focusing from infinity to a close object is performed by moving the second lens group G2 to the image side.
- the image blur correction (anti-vibration) on the image plane I is performed by moving the forty-second lens group G42 as a vibration-proof lens group VR so as to have a component perpendicular to the optical axis.
- the image stabilization coefficient ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction
- K rotational blurring at an angle ⁇
- the 41st lens group G41 located on the object side of the 42nd lens group G42 is fixed at the time of image blur correction.
- the image stabilization coefficient in the wide-angle end state, is ⁇ 0.65 and the focal length is 16.40 mm. Therefore, the image stabilization lens group VR for correcting the rotational blur of 0.81 degrees is used.
- the amount of movement is -0.36 mm.
- the image stabilization coefficient In the intermediate focal length state, the image stabilization coefficient is ⁇ 0.76 and the focal length is 23.50 mm. Therefore, the movement amount of the image stabilization lens group VR for correcting the rotation blur of 0.68 degrees is ⁇ 0. 37 mm.
- the image stabilization coefficient In the telephoto end state, the image stabilization coefficient is ⁇ 0.99 and the focal length is 34.00 mm. Therefore, the amount of movement of the image stabilization lens group VR for correcting the rotational blur of 0.57 degrees is ⁇ 0. 34 mm.
- Table 2 below shows the values of each item in the second example.
- Surface numbers 1 to 31 in Table 2 correspond to the optical surfaces m1 to m31 shown in FIG.
- FIG. 6 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) of the zoom optical system ZL2 according to the second example when focusing on infinity.
- (A) shows a wide-angle end state
- (b) shows an intermediate focal length state
- (c) shows a telephoto end state.
- FIG. 7 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the zoom optical system ZL2 according to the second example is in close focus.
- FIG. 8 is a lateral aberration diagram when image blur correction is performed at the time of focusing on infinity of the variable magnification optical system ZL2 according to the second example, where (a) is a wide-angle end state, and (b) is an intermediate focus.
- the distance state, (c) shows the telephoto end state.
- variable magnification optical system ZL2 has various aberrations from the wide-angle end state to the telephoto end state, and from the infinite focus state to the close-up focus state. It can be seen that it has a good optical performance. Further, it can be seen that the image formation performance is high at the time of image blur correction.
- variable magnification optical system having a bright F value of about F2.8 and a wide field angle of about 50 ° or more at a half field angle and in which various aberrations are well corrected is realized. be able to.
- variable magnification optical system ZL As a numerical example of the variable magnification optical system ZL, a five-group configuration is shown, but the present invention is not limited to this and can be applied to other group configurations (for example, six groups). Specifically, a configuration in which a lens or a lens group is added closest to the object side or a configuration in which a lens or a lens group is added closest to the image side may be used. In addition, it is conceivable to divide the first lens group G1 into a plurality of lens groups and move or fix one of them in a different locus during zooming.
- the forty-first lens group G41 has a negative refractive power, but may have a positive refractive power.
- the forty-second lens group G42 has negative refractive power, but may have positive refractive power.
- the lens group refers to a portion having at least one lens separated by an air interval that changes at the time of zooming or focusing.
- variable magnification optical system ZL in order to focus from infinity to a short distance object, a part of the lens group, one entire lens group, or a plurality of lens groups is moved in the optical axis direction as a focusing lens group.
- a configuration may be adopted.
- such a focusing lens group can be applied to autofocus, and is also suitable for driving by an autofocus motor (for example, an ultrasonic motor, a stepping motor, a voice coil motor, etc.).
- an autofocus motor for example, an ultrasonic motor, a stepping motor, a voice coil motor, etc.
- the entire second lens group G2 is the focusing lens group, but a part of the second lens group G2 may be the focusing lens group.
- the focusing lens group may be composed of one single lens and one cemented lens as described above, but there is no particular limitation on the number of lenses, and the focusing lens group is composed of one or more lens components. Also good.
- variable magnification optical system ZL either one of the entire lens group or the partial lens group is moved so as to have a component in a direction perpendicular to the optical axis, or rotated (oscillated) in an in-plane direction including the optical axis.
- a vibration-proof lens group that corrects image blur caused by camera shake may be used.
- a part of the fourth lens group G4 is an anti-vibration lens group.
- the anti-vibration lens group may be composed of one cemented lens as described above, but the number of lenses is not particularly limited, and may be composed of one single lens or a plurality of lens components.
- the anti-vibration lens group may have a positive refractive power, and it is preferable that the refractive power of the fourth lens group G4 as a whole becomes negative.
- the lens surface may be formed as a spherical surface, a flat surface, or an aspherical surface.
- the lens surface is a spherical surface or a flat surface, lens processing and assembly adjustment are facilitated, and deterioration of optical performance due to processing and assembly adjustment errors can be prevented. Further, even when the image plane is deviated, there is little deterioration in drawing performance.
- the lens surface is an aspheric surface
- the aspheric surface is an aspheric surface by grinding, a glass mold aspheric surface made of glass with an aspheric shape, or a composite aspheric surface made of resin with an aspheric shape on the glass surface. Any aspherical surface may be used.
- the lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.
- GRIN lens gradient index lens
- the aperture stop S be disposed integrally with the 41st lens group G41 in the 4th lens group G4. It may be configured to be movable separately from the forty-first lens group G41.
- a lens frame may be used instead of a member as an aperture stop.
- each lens surface may be provided with an antireflection film having a high transmittance in a wide wavelength region in order to reduce flare and ghost and achieve good optical performance with high contrast.
- the kind of antireflection film can be selected as appropriate. Further, the number and position of the antireflection film can be appropriately selected.
- any of the image side surface of L11, the object side surface of L12, the image side surface of L12, the object side surface of L13, the image side surface of L13, and the object side surface of L14 of the first lens group G1 It is possible to apply an antireflection film having a high transmittance in the wavelength region to the surface or a plurality of surfaces.
- the zoom optical system ZL can have a zoom ratio of about 1.5 to 2.5 times.
- the variable magnification optical system ZL can have a focal length (35 mm version equivalent) in the wide-angle end state of, for example, about 15 to 20 mm.
- the variable magnification optical system ZL can have an F value in the wide-angle end state of about 2.7 to 3.5, for example.
- the F value in the telephoto end state can be set to about 2.7 to 3.5, for example.
- the variable magnification optical system ZL can make the F value substantially constant (the amount of change is less than 10% of the F value in the telephoto end state) when the focal length state changes from the wide-angle end state to the telephoto end state.
- FIG. 9 shows an example of the configuration of the variable magnification optical system ZL.
- the number of lens groups, the lens configuration in each lens group, and the like can be changed as appropriate.
- the variable magnification optical system includes a first lens group G1 having negative refractive power, a second lens group G2 having positive refractive power, and a third lens group G3 arranged in order from the object side. And a fourth lens group G4 and a fifth lens group G5 having a positive refractive power, a distance between the first lens group G1 and the second lens group G2, and a second lens group G2 and a third lens group.
- the fourth lens group is changed by changing the distance between the third lens group G3 and the fourth lens group G4, and the distance between the fourth lens group G4 and the fifth lens group G5.
- At least a part of G4 is configured to be movable so as to have a component perpendicular to the optical axis.
- the fourth lens group G4 can have a negative refractive power.
- variable magnification optical system ZL includes a first lens group G1 having negative refractive power, a second lens group G2 having positive refractive power, and a third lens group G3 arranged in order from the object side.
- the fourth lens group G4 has a fourth lens group G4 having a negative refractive power and a fifth lens group G5 having a positive refractive power.
- the fourth lens group G4 performs zooming by changing the interval between the lens groups.
- At least a part of the image stabilization lens group VR is configured to be movable so as to have a component perpendicular to the optical axis in order to correct image blur.
- a negative first lens group G1, a positive second lens group G2, a third lens group G3, a negative fourth lens group G4, and a positive fifth lens group G5 are provided.
- image blur correction by moving at least a part of the negative fourth lens group G4 so as to have a component perpendicular to the optical axis, the occurrence of decentering coma during image blur correction and the occurrence of one-side blur Occurrence can be suppressed and good imaging performance can be realized.
- the third lens group G3 may have a positive refractive power or a negative refractive power.
- the fourth lens group G4 may have one or more lenses that do not move at the time of image blur correction in addition to the anti-vibration lens group VR.
- the zoom optical system ZL satisfies the following conditional expressions (5) and (6).
- D34T the air gap between the third lens group G3 and the fourth lens group G4 in the telephoto end state
- D34W the air gap between the third lens group G3 and the fourth lens group G4 in the wide-angle end state
- D23T the air gap between the second lens group G2 and the third lens group G3 in the telephoto end state
- D23W the air gap between the second lens group G2 and the third lens group G3 in the wide-angle end state
- f4 focal length of the fourth lens group G4, f3: focal length of the third lens group G3.
- Conditional expression (5) indicates the change in the distance between the third lens group G3 and the fourth lens group G4 during zooming from the wide-angle end state to the telephoto end state, and the second lens group G2 and the third lens group G3. It is a conditional expression for prescribing an appropriate value of the ratio to the interval change. By satisfying conditional expression (5), it is possible to realize a bright F-number (about F2.8 to F3.5) and good correction of various aberrations including spherical aberration while maintaining the zooming effect. Can do.
- conditional expression (5) is 0.800. In order to ensure the effect, it is preferable that the upper limit value of conditional expression (5) is 0.600.
- the ratio of the change in the distance between the third lens group G3 and the fourth lens group G4 to the change in the distance between the second lens group G2 and the third lens group G3 becomes negatively large.
- the change in the distance between the second lens group G2 and the third lens group G3 becomes relatively small, and the zooming effect is reduced. As a result, it becomes difficult to ensure a zoom ratio and a wide angle of view.
- conditional expression (5) In order to ensure the effect, it is preferable to set the lower limit value of conditional expression (5) to ⁇ 0.300. In order to ensure the effect, it is preferable that the lower limit value of the conditional expression (5) is set to ⁇ 0.200.
- Conditional expression (6) is a conditional expression for defining an appropriate ratio of the focal lengths of the fourth lens group G4 and the third lens group G3. By satisfying conditional expression (6), it is possible to make the amount of movement of the fourth lens group G4 moved at the time of image blur correction appropriate while improving the image forming performance at the time of image blur correction.
- the negative refractive power of the third lens group G3 increases, and at the same time, the negative refractive power of the fourth lens group G4 decreases, and the fourth refractive index is moved during image blur correction.
- the amount of movement of the lens group G4 increases.
- the image blur correction mechanism is increased in size, and the entire lens is increased in size.
- conditional expression (6) is 0.400. In order to ensure the effect, it is preferable that the upper limit value of conditional expression (6) is 0.350.
- the positive refractive power of the third lens group G3 increases, and at the same time, the negative refractive power of the fourth lens group G4 increases, and the fourth lens group during image blur correction.
- the occurrence of decentration aberrations increases when G4 is moved so as to have a component perpendicular to the optical axis. As a result, the occurrence of decentration coma or one-sided blur that occurs during image blur correction increases, and good imaging performance cannot be maintained.
- conditional expression (6) In order to ensure the effect, it is preferable to set the lower limit of conditional expression (6) to ⁇ 0.350. In order to ensure the effect, it is preferable that the lower limit value of conditional expression (6) is set to ⁇ 0.300.
- variable magnification optical system ZL preferably satisfies the following conditional expression (7). 0.200 ⁇ f1 / f4 ⁇ 0.900 (7) However, f1: Focal length of the first lens group G1.
- Conditional expression (7) is a conditional expression for satisfactorily correcting curvature of field and coma aberration while obtaining a wide angle of view (a half angle of view of about 50 ° or more) in the wide-angle end state.
- conditional expression (7) If the upper limit value of conditional expression (7) is exceeded, the focal length of the first lens group G1 becomes long, and it becomes difficult to obtain a wide angle of view (a half angle of view of about 50 ° or more) in the wide angle end state. Alternatively, the total lens length and the lens diameter of the first lens group G1 are increased, which is not preferable.
- conditional expression (7) is 0.800. In order to ensure the effect, it is preferable that the upper limit value of conditional expression (7) is 0.700.
- conditional expression (7) If the lower limit value of conditional expression (7) is not reached, the focal length of the first lens group G1 becomes short, and it becomes difficult to correct curvature of field and coma, making it impossible to achieve good imaging performance.
- conditional expression (7) In order to ensure the effect, it is preferable that the lower limit value of conditional expression (7) is 0.250. In order to ensure the effect, it is preferable that the lower limit value of conditional expression (7) is 0.300.
- the third lens group G3 can preferably include a negative lens and a positive lens.
- This configuration is effective in correcting decentration coma and one-sided blur when the fourth lens group G4 is moved for image blur correction. It is also effective for correcting various aberrations including spherical aberration and astigmatism during zooming.
- the fourth lens group G4 includes a cemented lens of a positive lens and a negative lens.
- This configuration is effective in correcting decentration coma and one-sided blur when the fourth lens group G4 is moved for image blur correction.
- the lens that moves for image blur correction can be reduced in size and weight, which is effective in reducing the size of the image blur correction mechanism and the entire lens.
- the fourth lens group G4 is not limited to the configuration in which the positive lens and the negative lens are bonded as described above, but may be configured to include two lenses (peeled off at the bonding surface).
- the most image side lens surface of the fourth lens group G4 is an aspherical surface.
- This configuration is effective in correcting decentration coma and one-sided blur when the fourth lens group G4 is moved for image blur correction.
- variable magnification optical system ZL preferably satisfies the following conditional expression (8). 1.100 ⁇ A (T3.5) / A (T4.0) ⁇ 5.000 (8) However, A (T3.5): On the point where the axial ray corresponding to the F value of F / 3.5 in the telephoto end state passes through the aspherical surface formed on the lens surface closest to the image side of the fourth lens group G4. Aspheric amount, A (T4.0): An axial ray corresponding to an F value of F / 4.0 in the telephoto end state passes through an aspherical surface formed on the lens surface closest to the image side of the fourth lens group G4. Aspheric amount.
- the aspheric amount is an amount obtained by measuring the sag amount of the aspheric surface with respect to the approximate spherical surface along the optical axis on the aspheric optical axis.
- Conditional expression (8) is a conditional expression for defining an appropriate value of the amount of aspheric surface on the most aspherical surface on the image side of the fourth lens group G4.
- conditional expression (8) If the upper limit of conditional expression (8) is exceeded, the aspherical amount of the fourth lens group G4 becomes excessive, and decentration coma and one-sided blur when the fourth lens group G4 is moved for image blur correction are corrected. Difficult to do.
- conditional expression (8) is set to 4.000. In order to ensure the effect, it is preferable that the upper limit value of conditional expression (8) is 3.000.
- conditional expression (8) If the lower limit of conditional expression (8) is not reached, the aspheric amount of the fourth lens group G4 is insufficient, and decentration coma and one-sided blur when the fourth lens group G4 is moved for image blur correction are corrected. Difficult to do.
- conditional expression (8) is 1.250. In order to ensure the effect, it is preferable that the lower limit value of the conditional expression (8) is 1.400.
- the zoom optical system ZL it is preferable that the third lens group G3 is fixed with respect to the image plane at the time of zooming, for example, as in a fourth example described later.
- the zooming mechanism can be simplified, and it is effective in ensuring imaging performance by downsizing, cost reduction, and eccentric error reduction.
- this effect becomes significant when the diaphragm is integrated with the third lens group G3.
- the fourth lens group G4 is fixed with respect to the image plane at the time of zooming, for example, as in a fifth example described later.
- This configuration can simplify the zoom mechanism and is effective in reducing the size and cost. Further, since the fourth lens group G4 is the anti-vibration lens group VR, it is not necessary to move the image blur correction mechanism in the optical axis direction, which is particularly effective for downsizing the entire lens.
- variable magnification optical system ZL can preferably perform focusing by moving the second lens group G2 in the optical axis direction as the focusing lens group.
- the focusing lens group can be reduced in size and weight, and the entire lens system can be reduced in size and the focusing speed during autofocusing can be increased.
- variable magnification optical system ZL having a bright F value, a wide angle of view, and various aberrations corrected satisfactorily.
- the above-described zoom optical system ZL can be provided in the above-described camera (optical apparatus) shown in FIG.
- variable magnification optical system ZL mounted on the camera 1 as the photographing lens 2 has a bright F value, a wide angle of view, and various aberrations due to its characteristic lens configuration, as will be understood from each of the embodiments described later. And has good optical performance. Therefore, according to the camera 1, it is possible to realize an optical apparatus having a bright F value, a wide angle of view, various aberrations being favorably corrected, and good optical performance.
- the example of the mirrorless camera was demonstrated as the camera 1, it is not limited to this.
- the above zooming optical system ZL is mounted on a single-lens reflex camera that has a quick return mirror in the camera body and observes a subject with a viewfinder optical system, the same effect as the camera 1 can be obtained. Can do.
- variable magnification optical system ZL an example of a manufacturing method of the above-described variable magnification optical system ZL will be outlined.
- 36 and 37 show an example of a method for manufacturing the variable magnification optical system ZL.
- the zooming is performed by changing the distance between the third lens group G3, the distance between the third lens group G3 and the fourth lens group G4, and the distance between the fourth lens group G4 and the fifth lens group G5.
- Each lens is arranged (step ST1).
- Each lens is arranged so that at least a part of the fourth lens group G4 can move so as to have a component perpendicular to the optical axis (step ST2).
- Each lens is arranged so as to satisfy the following conditional expressions (5) and (6) (step ST3).
- D34T an air space between the third lens group and the fourth lens group in the telephoto end state
- D34W an air gap between the third lens group and the fourth lens group in the wide-angle end state
- D23T an air gap between the second lens group and the third lens group in the telephoto end state
- D23W an air space between the second lens group and the third lens group in the wide-angle end state
- f4 focal length of the fourth lens group
- f3 focal length of the third lens group.
- the zoom lens has a group G3, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.
- Each lens is arranged (step ST10).
- Each lens is arranged so that at least a part of the fourth lens group G4 can move so as to have a component perpendicular to the optical axis in order to correct image blurring (step ST20).
- Each lens is arranged so as to satisfy the following conditional expressions (5) and (6) (step ST30).
- D34T the air gap between the third lens group G3 and the fourth lens group G4 in the telephoto end state
- D34W the air gap between the third lens group G3 and the fourth lens group G4 in the wide-angle end state
- D23T the air gap between the second lens group G2 and the third lens group G3 in the telephoto end state
- D23W the air gap between the second lens group G2 and the third lens group G3 in the wide-angle end state
- f4 focal length of the fourth lens group G4, f3: focal length of the third lens group G3.
- a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 are arranged in order from the object side.
- a first lens group G1 a cemented lens of a biconvex lens L21, a negative meniscus lens L22 having a concave surface facing the image side and a positive meniscus lens L23 having a convex surface facing the object side, and a concave surface facing the biconvex lens L24 and the object side Is arranged to form a second lens group G2, and a biconcave lens L31 and a biconvex lens L32 are arranged to form a third lens group G3.
- the biconcave lens L41 and the object side are arranged on the object side.
- a cemented lens with a positive meniscus lens L42 having a convex surface is disposed to form a fourth lens group G4.
- a biconvex lens L51, a biconvex lens L52, and a biconcave lens L5 are arranged.
- a cemented lens of a, and the fifth lens group G5 are arranged biconvex lens L54 and a biconcave lens L55.
- the lens groups thus prepared are arranged in the above-described procedure to manufacture the variable magnification optical system ZL.
- variable magnification optical system ZL having a bright F value, a wide angle of view, and various aberrations corrected favorably.
- FIG. 13, and FIG. 17 are sectional views showing the configuration and refractive power distribution of the variable magnification optical system ZL (ZL1 to ZL3) according to each example.
- the optical axis of each lens group when changing magnification from the wide-angle end state (W) to the telephoto end state (T) through the intermediate focal length state (M) is shown.
- the moving direction along is indicated by an arrow.
- variable magnification optical systems ZL1 to ZL3 In the upper part of the sectional view of the variable magnification optical systems ZL1 to ZL3, the moving direction of the focusing lens group when focusing on an object at a short distance from infinity is indicated by an arrow, and the image stabilizing lens group for correcting image blurring The state of VR is also shown.
- each reference code for FIG. 9 according to the third embodiment is used independently for each embodiment in order to avoid complication of explanation due to an increase in the number of digits of the reference code. Therefore, even if the same reference numerals as those in the drawings according to the other embodiments are given, they are not necessarily in the same configuration as the other embodiments.
- Tables 3 to 5 are shown below. These are tables of specifications in the third to fifth embodiments.
- d-line (wavelength 587.562 nm) and g-line (wavelength 435.835 nm) are selected as the calculation targets of the aberration characteristics.
- the surface number is the order of the optical surfaces from the object side along the light traveling direction
- R is the radius of curvature of each optical surface
- D is the next optical surface from each optical surface ( Or an optical surface distance to the image surface)
- nd is a refractive index of the material of the optical member with respect to the d-line
- ⁇ d is an Abbe number based on the d-line of the material of the optical member.
- (Di) indicates the surface interval between the i-th surface and the (i + 1) -th surface
- (aperture stop) indicates the aperture stop S.
- the optical surface is an aspherical surface
- the surface number is marked with *
- the column of curvature radius R indicates the paraxial curvature radius.
- f is the focal length of the entire lens system
- FNo is the F number
- ⁇ is the half angle of view (unit: °)
- Y is the maximum image height
- BF is the optical axis at the time of focusing on infinity.
- the distance from the last lens surface to the image surface I is expressed in terms of air length.
- TL is the distance from the front lens surface to the last lens surface on the optical axis when focusing on infinity. Each one is shown.
- Di is the surface distance between the i-th surface and the (i + 1) -th surface
- D0 is the axial air space between the object surface and the lens surface closest to the object side of the first lens group G1
- f represents the focal length of the entire lens system
- ⁇ represents the photographing magnification.
- mm is generally used for the focal length f, the radius of curvature R, the surface interval D, and other lengths, etc. unless otherwise specified.
- the optical system is not limited to this because the same optical performance can be obtained even when proportional expansion or proportional reduction is performed.
- the unit is not limited to “mm”, and other appropriate units can be used.
- variable magnification optical system ZL (ZL1) includes a first lens group G1 having negative refractive power arranged in order from the object side, and a first lens group having positive refractive power.
- the second lens group G2 includes a third lens group G3 having negative refractive power, a fourth lens group G4 having negative refractive power, and a fifth lens group G5 having positive refractive power.
- the first lens group G1 is composed of a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 arranged in order from the object side.
- the negative meniscus lens L11 has two aspheric surfaces.
- the biconcave lens L12 has an aspheric object side surface.
- the second lens group G2 includes a twenty-first lens group G21 having a positive refractive power and a twenty-second lens group G22 having a positive refractive power, which are arranged in order from the object side.
- the twenty-first lens group G21 includes a biconvex lens L21 arranged in order from the object side, and a cemented lens of a negative meniscus lens L22 having a concave surface facing the image side and a positive meniscus lens L23 having a convex surface facing the object side.
- the 22nd lens group G22 is composed of a cemented lens composed of a biconvex lens L24 and a negative meniscus lens L25 having a concave surface directed toward the object side, which are arranged in order from the object side.
- the third lens group G3 is composed of a biconcave lens L31 and a biconvex lens L32 arranged in order from the object side.
- the fourth lens group G4 is composed of a cemented lens of a biconcave lens L41 arranged in order from the object side and a positive meniscus lens L42 having a convex surface directed toward the object side.
- the positive meniscus lens L42 has an aspheric image side surface.
- the fifth lens group G5 includes a biconvex lens L51, a cemented lens of a biconvex lens L52 and a biconcave lens L53, and a cemented lens of a biconvex lens L54 and a biconcave lens L55, which are arranged in order from the object side.
- the biconcave lens L55 has an aspheric image side surface.
- An aperture stop S is provided between the second lens group G2 and the third lens group G3, and the aperture stop S constitutes the third lens group G3.
- the zooming from the wide-angle end state to the telephoto end state is performed by changing each lens group interval (the interval between the first lens group G1 and the second lens group G2, the interval between the second lens group G2 and the third lens group G3,
- the first lens group G1 is temporarily moved to the image side so that the distance between the third lens group G3 and the fourth lens group G4 and the distance between the fourth lens group G4 and the fifth lens group G5 are changed.
- the second lens group G2 is moved to the object side
- the third lens group G3 is moved to the object side
- the fourth lens group G4 is moved to the object side
- the fifth lens group G5 is moved to the object side. This is done by moving to the object side.
- the aperture stop S is moved to the object side integrally with the third lens group G3.
- Focusing from infinity to a close object is performed by moving the 21st lens group G21 to the image side.
- image blur correction on the image plane I is performed by moving the fourth lens group G4 as a vibration-proof lens group VR so as to have a component perpendicular to the optical axis.
- the image stabilization coefficient ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction
- K rotational blurring at an angle ⁇ is used.
- the image stabilization lens group VR for correcting the rotation blur of 0.81 degrees is used.
- the amount of movement is -0.36 mm.
- the image stabilization coefficient is ⁇ 0.74 and the focal length is 23.50 mm. Therefore, the movement amount of the image stabilization lens group VR for correcting the rotation blur of 0.68 degrees is ⁇ 0. .38 mm.
- the image stabilization coefficient is ⁇ 0.95 and the focal length is 34.00 mm. Therefore, the movement amount of the image stabilization lens group VR for correcting the rotational blur of 0.57 degrees is ⁇ 0. 35 mm.
- Table 3 shows the values of each item in the third example.
- Surface numbers 1 to 32 in Table 3 correspond to the respective optical surfaces m1 to m32 shown in FIG.
- variable magnification optical system ZL1 satisfies the conditional expressions (5) to (8).
- FIG. 10 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) at the time of focusing on infinity of the variable magnification optical system ZL1 according to the third example.
- (A) shows a wide-angle end state
- (b) shows an intermediate focal length state
- (c) shows a telephoto end state.
- FIG. 11 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the zoom optical system ZL1 according to the third example is in close focus.
- FIG. 12A is a wide-angle end state
- FIG. The distance state, (c) shows the telephoto end state.
- FNO is the F number
- NA is the numerical aperture
- A is the half field angle (unit: °) with respect to each image height
- H0 is the object height.
- d indicates the d-line
- g indicates the aberration at the g-line.
- those without these descriptions show aberrations at the d-line.
- the value of the F number corresponding to the maximum aperture is shown.
- the numerical aperture value corresponding to the maximum aperture is shown.
- the solid line indicates the sagittal image plane
- the broken line indicates the meridional image plane.
- variable magnification optical system ZL1 has various aberrations from the wide-angle end state to the telephoto end state, and from the infinite focus state to the close-up focus state. It can be seen that it has a good optical performance. Further, it can be seen that the image formation performance is high at the time of image blur correction.
- variable magnification optical system ZL (ZL2) includes a first lens group G1 having negative refractive power arranged in order from the object side, and a first lens group having positive refractive power.
- the second lens group G2 includes a third lens group G3 having negative refractive power, a fourth lens group G4 having negative refractive power, and a fifth lens group G5 having positive refractive power.
- the first lens group G1 is composed of a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 arranged in order from the object side.
- the negative meniscus lens L11 has two aspheric surfaces.
- the biconcave lens L12 has an aspheric object side surface.
- the second lens group G2 includes a twenty-first lens group G21 having a positive refractive power and a twenty-second lens group G22 having a positive refractive power, which are arranged in order from the object side.
- the twenty-first lens group G21 includes a biconvex lens L21 arranged in order from the object side, and a cemented lens of a negative meniscus lens L22 having a concave surface facing the image side and a positive meniscus lens L23 having a convex surface facing the object side.
- the 22nd lens group G22 is composed of a cemented lens composed of a biconvex lens L24 and a negative meniscus lens L25 having a concave surface directed toward the object side, which are arranged in order from the object side.
- the third lens group G3 is composed of a negative meniscus lens L31 having a concave surface facing the object side and a positive meniscus lens L32 having a convex surface facing the image side, which are arranged in order from the object side.
- the fourth lens group G4 is composed of a cemented lens of a biconcave lens L41 arranged in order from the object side and a positive meniscus lens L42 having a convex surface directed toward the object side.
- the positive meniscus lens L42 has an aspheric image side surface.
- the fifth lens group G5 includes a biconvex lens L51, a cemented lens of a biconvex lens L52 and a biconcave lens L53, and a cemented lens of a biconvex lens L54 and a biconcave lens L55, which are arranged in order from the object side.
- the biconcave lens L55 has an aspheric image side surface.
- An aperture stop S is provided between the second lens group G2 and the third lens group G3, and the aperture stop S constitutes the third lens group G3.
- the zooming from the wide-angle end state to the telephoto end state is performed by changing each lens group interval (the interval between the first lens group G1 and the second lens group G2, the interval between the second lens group G2 and the third lens group G3,
- the first lens group G1 is temporarily moved to the image side so that the distance between the third lens group G3 and the fourth lens group G4 and the distance between the fourth lens group G4 and the fifth lens group G5 are changed.
- the object is moved to the object side
- the second lens group G2 is moved to the object side
- the third lens group G3 is fixed to the image plane
- the fourth lens group G4 is once moved to the image side. This is done by moving the fifth lens group G5 to the object side.
- the aperture stop S is fixed to the image plane integrally with the third lens group G3.
- Focusing from infinity to a close object is performed by moving the 21st lens group G21 to the image side.
- image blur correction on the image plane I is performed by moving the fourth lens group G4 as a vibration-proof lens group VR so as to have a component perpendicular to the optical axis.
- the image stabilization coefficient ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction
- K rotational blurring at an angle ⁇ is used.
- the image stabilization lens group VR for correcting the rotational blur of 0.81 degrees is used.
- the amount of movement is -0.34 mm.
- the image stabilization coefficient is ⁇ 0.76 and the focal length is 24.50 mm. Therefore, the movement amount of the image stabilization lens group VR for correcting the rotation blur of 0.67 degrees is ⁇ 0. .38 mm.
- the image stabilization coefficient is ⁇ 0.95 and the focal length is 34.00 mm. Therefore, the movement amount of the image stabilization lens group VR for correcting the rotational blur of 0.57 degrees is ⁇ 0. 35 mm.
- Table 4 shows the values of each item in the fourth example.
- Surface numbers 1 to 32 in Table 4 correspond to the optical surfaces m1 to m32 shown in FIG.
- variable magnification optical system ZL2 satisfies the conditional expressions (5) to (8).
- FIG. 14 is a diagram showing various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) at the time of focusing on infinity of the variable magnification optical system ZL2 according to Example 4.
- (A) shows a wide-angle end state
- (b) shows an intermediate focal length state
- (c) shows a telephoto end state.
- FIG. 15 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the zoom optical system ZL2 according to Example 4 is in close focus.
- FIG. 16A is a wide-angle end state
- FIG. 16B is an intermediate focus.
- the distance state, (c) shows the telephoto end state.
- variable magnification optical system ZL2 has various aberrations from the wide-angle end state to the telephoto end state, and from the infinite focus state to the close-up focus state. It can be seen that it has a good optical performance. Further, it can be seen that the image formation performance is high at the time of image blur correction.
- variable magnification optical system ZL (ZL3) includes a first lens group G1 having negative refractive power arranged in order from the object side, and a first lens group G1 having positive refractive power.
- the second lens group G2 includes a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.
- the first lens group G1 is composed of a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 arranged in order from the object side.
- the negative meniscus lens L11 has two aspheric surfaces.
- the biconcave lens L12 has an aspheric object side surface.
- the second lens group G2 includes a twenty-first lens group G21 having a positive refractive power and a twenty-second lens group G22 having a positive refractive power, which are arranged in order from the object side.
- the twenty-first lens group G21 includes a biconvex lens L21 arranged in order from the object side, and a cemented lens of a negative meniscus lens L22 having a concave surface facing the image side and a positive meniscus lens L23 having a convex surface facing the object side.
- the 22nd lens group G22 is composed of a cemented lens composed of a biconvex lens L24 and a negative meniscus lens L25 having a concave surface directed toward the object side, which are arranged in order from the object side.
- the third lens group G3 is composed of a negative meniscus lens L31 arranged in order from the object side and having a concave surface directed toward the object side, and a biconvex lens L32.
- the biconvex lens L32 has an aspheric image side surface.
- the fourth lens group G4 is composed of a cemented lens of a biconcave lens L41 arranged in order from the object side and a positive meniscus lens L42 having a convex surface directed toward the object side.
- the positive meniscus lens L42 has an aspheric image side surface.
- the fifth lens group G5 includes a biconvex lens L51, a biconvex lens L52, a cemented lens of a negative meniscus lens L53 having a concave surface directed toward the object side, and a biconvex lens L54 and a biconcave lens L55, which are arranged in order from the object side. It consists of a lens.
- the biconvex lens L52 has an aspheric object side surface.
- the biconcave lens L55 has an aspheric image side surface.
- An aperture stop S is provided between the second lens group G2 and the third lens group G3, and the aperture stop S constitutes the third lens group G3.
- the first lens group G1 is once moved to the image side and then moved to the object side so that the distance between the lens groups changes, and the second lens group G2 is moved. This is done by moving to the object side, moving the third lens group G3 to the object side, fixing the fourth lens group G4 to the image plane, and moving the fifth lens group G5 to the object side.
- the aperture stop S is moved to the object side integrally with the third lens group G3.
- Focusing from infinity to a close object is performed by moving the 21st lens group G21 to the image side.
- image blur correction on the image plane I is performed by moving the fourth lens group G4 as a vibration-proof lens group VR so as to have a component perpendicular to the optical axis.
- the image stabilization coefficient ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction
- K rotational blurring at an angle ⁇ is used.
- the image stabilization lens group VR for correcting the rotation blur of 0.81 degrees is used.
- the amount of movement is -0.23 mm.
- the image stabilization coefficient is ⁇ 1.12 and the focal length is 23.50 mm. Therefore, the movement amount of the image stabilization lens group VR for correcting the rotation blur of 0.68 degrees is ⁇ 0. .25 mm.
- the image stabilization coefficient is ⁇ 1.37 and the focal length is 34.00 mm. Therefore, the movement amount of the image stabilization lens group VR for correcting the rotation blur of 0.57 degrees is ⁇ 0. 24 mm.
- Table 5 shows the values of each item in the fifth example.
- Surface numbers 1 to 32 in Table 5 correspond to the optical surfaces m1 to m32 shown in FIG.
- variable magnification optical system ZL3 satisfies the conditional expressions (5) to (8).
- FIG. 18 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the variable magnification optical system ZL3 according to Example 5 is focused at infinity.
- (A) shows a wide-angle end state
- (b) shows an intermediate focal length state
- (c) shows a telephoto end state.
- FIG. 19 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the zoom optical system ZL3 according to Example 5 is in close focus.
- FIG. 20 is a lateral aberration diagram when image blur correction is performed at the time of focusing on infinity of the variable magnification optical system ZL3 according to Example 5, where (a) is a wide-angle end state and (b) is an intermediate focus. The distance state, (c) shows the telephoto end state.
- variable magnification optical system ZL3 has various aberrations from the wide-angle end state to the telephoto end state and from the infinite focus state to the close-up focus state. It can be seen that it has a good optical performance. Further, it can be seen that the image formation performance is high at the time of image blur correction.
- variable magnification optical system having a bright F value of about F2.8 and a wide field angle of about 50 ° or more at a half field angle and in which various aberrations are well corrected is realized. be able to.
- variable magnification optical system ZL As a numerical example of the variable magnification optical system ZL, a five-group configuration is shown, but the present invention is not limited to this and can be applied to other group configurations (for example, six groups). Specifically, a configuration in which a lens or a lens group is added closest to the object side or a configuration in which a lens or a lens group is added closest to the image side may be used. In addition, it is conceivable to divide the first lens group G1 into a plurality of lens groups and move or fix one of them in a different locus during zooming. Further, as described above, the third lens group G3 may have a negative refractive power or a positive refractive power.
- the lens group refers to a portion having at least one lens separated by an air interval that changes at the time of zooming or focusing.
- variable magnification optical system ZL in order to focus from infinity to a short distance object, a part of the lens group, one entire lens group, or a plurality of lens groups is moved in the optical axis direction as a focusing lens group.
- a configuration may be adopted.
- such a focusing lens group can be applied to autofocus, and is also suitable for driving by an autofocus motor (for example, an ultrasonic motor, a stepping motor, a voice coil motor, etc.).
- an autofocus motor for example, an ultrasonic motor, a stepping motor, a voice coil motor, etc.
- a part of the second lens group G2 is a focusing lens group, but the entire second lens group G2 may be a focusing lens group.
- the focusing lens group may be composed of one single lens and one cemented lens as described above, but there is no particular limitation on the number of lenses, and the focusing lens group is composed of one or more lens components. Also good.
- variable magnification optical system ZL either one of the entire lens group or the partial lens group is moved so as to have a component in a direction perpendicular to the optical axis, or rotated (oscillated) in an in-plane direction including the optical axis.
- a vibration-proof lens group that corrects image blur caused by camera shake may be used.
- the entire fourth lens group G4 is the anti-vibration lens group, but a part of the fourth lens group G4 may be the anti-vibration lens group.
- the anti-vibration lens group may be composed of one cemented lens as described above, but the number of lenses is not particularly limited, and may be composed of one single lens or a plurality of lens components.
- the anti-vibration lens group may have a positive refractive power, and it is preferable that the refractive power of the fourth lens group G4 as a whole becomes negative.
- the lens surface may be formed as a spherical surface, a flat surface, or an aspherical surface.
- the lens surface is a spherical surface or a flat surface, lens processing and assembly adjustment are facilitated, and deterioration of optical performance due to processing and assembly adjustment errors can be prevented. Further, even when the image plane is deviated, there is little deterioration in drawing performance.
- the lens surface is an aspheric surface
- the aspheric surface is an aspheric surface by grinding, a glass mold aspheric surface made of glass with an aspheric shape, or a composite aspheric surface made of resin with an aspheric shape on the glass surface. Any aspherical surface may be used.
- the lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.
- GRIN lens gradient index lens
- the aperture stop S can be preferably disposed integrally with the third lens group G3, particularly with the third lens group G3, but is moved separately from the third lens group G3. You may comprise.
- a lens frame may be used instead of a member as an aperture stop.
- each lens surface may be provided with an antireflection film having a high transmittance in a wide wavelength region in order to reduce flare and ghost and achieve good optical performance with high contrast.
- the kind of antireflection film can be selected as appropriate. Further, the number and position of the antireflection film can be appropriately selected. In the case of the above-described embodiment, any one of the L11 image side surface, the L12 object side surface, the L12 image side surface, the L13 object side surface, the L13 image side surface, the L14 object side surface, or a plurality of surfaces of the first lens group G1 It is preferable to provide an antireflection film having a high transmittance in the wavelength region on the surface.
- the zoom optical system ZL can have a zoom ratio of about 1.5 to 2.5 times.
- the variable magnification optical system ZL can have a focal length (35 mm version equivalent) in the wide-angle end state of, for example, about 15 to 20 mm.
- the variable magnification optical system ZL can have an F value in the wide-angle end state of about 2.7 to 3.5, for example.
- the F value in the telephoto end state can be set to about 2.7 to 3.5, for example.
- the variable magnification optical system ZL can make the F value substantially constant (the amount of change is less than 10% of the F value in the telephoto end state) when the focal length state changes from the wide-angle end state to the telephoto end state.
- FIG. 21 shows an example of the configuration of the variable magnification optical system ZL.
- the number of lens groups, the lens configuration in each lens group, and the like can be changed as appropriate.
- variable magnification optical system has a first lens group G1 having a negative refractive power, a second lens group G2 having a positive refractive power, and a positive refractive power arranged in order from the object side.
- the zooming is performed by changing the distance between the first lens group G1 and the sixth lens group G6 by changing the distance between the first lens group G5 and the sixth lens group G6.
- At least a part of the lens is configured to be movable so as to have a component perpendicular to the optical axis.
- variable magnification optical system ZL has a first lens group G1 having a negative refractive power, a second lens group G2 having a positive refractive power, and a positive refractive power arranged in order from the object side. It has a third lens group G3, a fourth lens group G4, a fifth lens group G5 having a negative refractive power, and a sixth lens group G6 having a positive refractive power, and the interval between the lens groups is changed.
- at least a part of any one of the first lens group G1 to the sixth lens group G6 is used as an anti-vibration lens group VR. It is configured to be movable so as to have a vertical component.
- Negative first lens group G1, positive second lens group G2, positive third lens group G3, fourth lens group G4, negative fifth lens group G5, and positive sixth lens group G6 By changing the distance between each group, it is possible to secure the degree of freedom of aberration correction, and to realize a variable magnification optical system with a wide angle of view and brightness. Further, by performing image blur correction by moving at least a part of any one of the first lens group G1 to the sixth lens group G6 so as to have a component perpendicular to the optical axis, Therefore, it is possible to suppress the occurrence of decentration coma aberration and the occurrence of one-sided blur and to realize good imaging performance.
- the fourth lens group G4 may have a positive refractive power or a negative refractive power.
- variable magnification optical system ZL can be configured so that at least a part of the fifth lens group G5 can move as an anti-vibration lens group VR so as to have a component perpendicular to the optical axis in order to correct image blur. Preferably it is possible.
- the negative fifth lens group G5 is selected as a lens group (anti-vibration lens group VR) that is moved for image blur correction, decentration aberration, particularly decentration coma aberration, generated when the fifth lens group G5 is shifted decentered. Further, it is possible to suppress the occurrence of eccentric image plane tilting (single blurring) and to improve the imaging performance at the time of image blur correction.
- the fifth lens group G5 can be configured to have a relatively small lens diameter, and is effective in reducing the size of the image blur correction mechanism and in turn reducing the size of the entire lens.
- the fifth lens group G5 may include one or more lenses that do not move during image blur correction, in addition to the anti-vibration lens group VR.
- variable magnification optical system ZL preferably satisfies the following conditional expression (9). -0.500 ⁇ f5 / f4 ⁇ 0.500 (9) However, f5: focal length of the fifth lens group G5, f4: focal length of the fourth lens group G4.
- Conditional expression (9) is a conditional expression for defining an appropriate value of the focal length of the fifth lens group G5 with respect to the focal length of the fourth lens group G4.
- conditional expression (9) When the upper limit value of conditional expression (9) is exceeded, the negative focal length of the fourth lens group G4 becomes short, the aberration correction balance in combination with the adjacent fifth lens group G5 for image blur correction is lost, and image blurring is lost. It becomes difficult to ensure imaging performance at the time of correction.
- the focal length of the fifth lens group G5 since the focal length of the fifth lens group G5 becomes negatively long, the amount of movement of the fifth lens group G5 for image blur correction increases, and the size of the image blur correction mechanism and the entire lens increases. Absent.
- conditional expression (9) is 0.400. In order to ensure the effect, it is preferable to set the upper limit value of conditional expression (9) to 0.350.
- conditional expression (9) If the lower limit value of conditional expression (9) is not reached, the positive focal length of the fourth lens group G4 becomes shorter, and the aberration correction balance in combination with the adjacent fifth lens group G5 for image blur correction is lost. It is difficult to ensure imaging performance during blur correction. Further, since the focal length of the fifth lens group G5 becomes negatively long, the amount of movement of the fifth lens group G5 for image blur correction increases, and the size of the image blur correction mechanism and the entire lens increases. It is not preferable.
- conditional expression (9) In order to ensure the effect, it is preferable to set the lower limit value of conditional expression (9) to ⁇ 0.400. In order to secure the effect, it is preferable that the lower limit value of the conditional expression (9) is set to ⁇ 0.300.
- variable magnification optical system ZL preferably satisfies the following conditional expression (10). 0.300 ⁇ ( ⁇ f1) / f6 ⁇ 0.900 (10) However, f1: Focal length of the first lens group G1 f6: focal length of the sixth lens group G6.
- Conditional expression (10) is a conditional expression for defining the focal length of the first lens group G1 with respect to the sixth lens group G6. By satisfying conditional expression (10), it is possible to satisfactorily correct field curvature and coma aberration while obtaining a wide angle of view (about 50 ° or more of the half angle of view) in the wide-angle end state.
- conditional expression (10) If the upper limit value of conditional expression (10) is exceeded, the negative focal length of the first lens group G1 becomes long, and it becomes difficult to obtain a wide angle of view (a half angle of view of about 50 ° or more) in the wide angle end state. Alternatively, the effective diameter of the first lens group G1 increases, leading to an increase in the size of the entire lens, which is not preferable.
- conditional expression (10) is 0.800. In order to ensure the effect, it is preferable that the upper limit value of conditional expression (10) is 0.700.
- conditional expression (10) If the lower limit of conditional expression (10) is not reached, the negative focal length of the first lens group G1 becomes short, and astigmatism and coma aberration in the wide-angle end state worsen, making correction difficult.
- conditional expression (10) is 0.400. In order to secure the effect, it is preferable that the lower limit value of conditional expression (10) is 0.500.
- variable magnification optical system ZL preferably satisfies the following conditional expression (11). ⁇ 0.400 ⁇ f1 / f4 ⁇ 0.400 (11) However, f1: Focal length of the first lens group G1 f4: focal length of the fourth lens group G4.
- Conditional expression (11) is a conditional expression for defining the focal length of the first lens group G1 with respect to the fourth lens group G4. More specifically, the conditional expression (11) indicates that the focal length of the fourth lens group G4 suitable for correcting decentration aberration when the adjacent fifth lens group G5 is shifted decentered for image blur correction, and the wide-angle end. This is a conditional expression for prescribing the focal length of the first lens group G1 for reducing the size of the entire lens while obtaining a wide angle of view (a half angle of view of about 50 ° or more).
- conditional expression (11) If the upper limit value of conditional expression (11) is exceeded, the negative focal length of the fourth lens group G4 becomes shorter, the aberration correction balance in combination with the adjacent fifth lens group G5 for image blur correction is lost, and image blurring is lost. It becomes difficult to ensure imaging performance at the time of correction.
- the negative focal length of the first lens group G1 becomes long, and it becomes difficult to obtain a wide angle of view (a half angle of view of about 50 ° or more) in the wide angle end state.
- the effective diameter of the first lens group G1 increases, leading to an increase in the size of the entire lens, which is not preferable.
- conditional expression (11) In order to ensure the effect, it is preferable to set the upper limit value of conditional expression (11) to 0.300. In order to ensure the effect, it is preferable that the upper limit value of conditional expression (11) is 0.200.
- the positive focal length of the fourth lens group G4 becomes shorter, the aberration correction balance in combination with the adjacent fifth lens group G5 for image blur correction is lost, and image blur is lost. It becomes difficult to ensure imaging performance at the time of correction.
- the negative focal length of the first lens group G1 becomes long, and it becomes difficult to obtain a wide angle of view (a half angle of view of about 50 ° or more) in the wide angle end state.
- the effective diameter of the first lens group G1 increases, leading to an increase in the size of the entire lens, which is not preferable.
- conditional expression (11) In order to ensure the effect, it is preferable to set the lower limit value of conditional expression (11) to ⁇ 0.300. In order to ensure the effect, it is preferable that the lower limit value of the conditional expression (11) is set to ⁇ 0.200.
- the fourth lens group G4 can preferably include a negative lens and a positive lens.
- This configuration is effective for correcting decentration coma and one-sided blur when the fifth lens group G5 is moved for image blur correction. Further, it is effective for good correction of variations in spherical aberration, astigmatism, and chromatic aberration during zooming.
- the fifth lens group G5 can preferably be composed of a cemented lens of a positive lens and a negative lens.
- This configuration is effective for correcting decentration coma and one-sided blur when the fifth lens group G5 is moved for image blur correction.
- the lens that moves for image blur correction can be reduced in size and weight, which is effective in reducing the size and cost of the image blur correction mechanism.
- the fifth lens group G5 is not limited to the configuration in which the positive lens and the negative lens are bonded as described above, but may be configured to include two lenses (peeled off at the bonding surface).
- the most image side lens surface of the fifth lens group G5 can preferably be an aspherical surface.
- This configuration is effective for correcting decentration coma and one-sided blur when the fifth lens group G5 is moved for image blur correction.
- the zoom optical system ZL preferably satisfies the following conditional expression (12).
- a (T3.5) On the point where the axial ray corresponding to the F value of F / 3.5 passes through the aspherical surface formed on the lens surface closest to the image side of the fifth lens group G5 in the telephoto end state.
- Aspheric amount A (T4.0): An axial ray corresponding to an F value of F / 4.0 in the telephoto end state passes through an aspherical surface formed on the lens surface closest to the image side of the fifth lens group G5.
- the aspheric amount is an amount obtained by measuring the sag amount of the aspheric surface with respect to the approximate spherical surface along the optical axis on the aspheric optical axis.
- Conditional expression (12) is a conditional expression for defining an appropriate value of the amount of aspheric surface on the most aspherical surface on the image side of the fifth lens group G5.
- conditional expression (12) If the upper limit of conditional expression (12) is exceeded, the amount of aspherical surface of the fifth lens group G5 becomes excessive, and decentration coma and one-sided blur when the fifth lens group G5 is moved for image blur correction are corrected. Difficult to do.
- conditional expression (12) is set to 4.000. In order to ensure the effect, it is preferable that the upper limit value of conditional expression (12) is 3.000.
- conditional expression (12) If the lower limit of conditional expression (12) is not reached, the amount of aspherical surface of the fifth lens group G5 is insufficient, and decentration coma and one-sided blur when the fifth lens group G5 is moved for image blur correction are corrected. Difficult to do.
- conditional expression (12) is 1.250. In order to ensure the effect, it is preferable that the lower limit value of the conditional expression (12) is 1.400.
- the first lens group G1 is fixed with respect to the image plane during zooming.
- This configuration is effective for simplifying the zooming mechanism and making the lens barrel robust.
- the fourth lens group G4 is fixed with respect to the image plane during zooming.
- the zooming mechanism can be simplified, and it is effective in ensuring imaging performance by downsizing, cost reduction, and eccentric error reduction.
- this effect becomes significant when the diaphragm is integrated with the fourth lens group G4.
- the fifth lens group G5 is fixed with respect to the image plane during zooming.
- This configuration can simplify the zoom mechanism and is effective in reducing the size and cost.
- the fifth lens group G5 is the anti-vibration lens group VR, it is not necessary to move the image blur correction mechanism in the optical axis direction, which is particularly effective for downsizing the entire lens.
- variable magnification optical system ZL can perform focusing by moving at least a part of any one of the second lens group G2 to the sixth lens group G6 in the optical axis direction as a focusing lens group. Preferably it is possible.
- the focusing lens group can be reduced in size and weight, and the focusing speed can be increased.
- variable magnification optical system ZL can preferably perform focusing by moving the second lens group G2 in the optical axis direction as the focusing lens group.
- the amount of focusing movement in the wide-angle end state and the telephoto end state can be set to substantially the same value, and the focus shift at the time of zooming when focusing on a short distance can be reduced.
- variable magnification optical system ZL preferably satisfies the following conditional expression (13).
- f2 focal length of the second lens group G2
- f3 focal length of the third lens group G3.
- Conditional expression (13) is a conditional expression for defining an appropriate ratio of the focal lengths of the second lens group G2 and the third lens group G3 when performing focusing with the second lens group G2.
- conditional expression (13) is 1.900. In order to secure the effect, it is preferable that the upper limit value of conditional expression (13) is 1.800.
- conditional expression (13) If the lower limit value of conditional expression (13) is not reached, the focal length of the second lens group G2 becomes short, and the amount of focusing movement in the wide-angle end state increases. For this reason, the difference in the amount of focusing movement between the wide-angle end state and the telephoto end state increases, and the focus shift at the time of zooming when focusing on a short distance increases, which is not preferable.
- the lower limit value of conditional expression (13) is 0.700. In order to ensure the effect, it is preferable that the lower limit value of conditional expression (13) is 0.900.
- variable magnification optical system ZL having a bright F value, a wide angle of view, and various aberrations corrected satisfactorily.
- the above-described zoom optical system ZL can be provided in the above-described camera (optical apparatus) shown in FIG.
- variable magnification optical system ZL mounted on the camera 1 as the photographing lens 2 has a bright F value, a wide angle of view, and various aberrations due to its characteristic lens configuration, as will be understood from each of the embodiments described later. And has good optical performance. Therefore, according to the camera 1, it is possible to realize an optical apparatus having a bright F value, a wide angle of view, various aberrations being favorably corrected, and good optical performance.
- the example of the mirrorless camera was demonstrated as a camera, it is not limited to this.
- the above zooming optical system ZL is mounted on a single-lens reflex camera that has a quick return mirror in the camera body and observes a subject with a viewfinder optical system, the same effect as the camera 1 can be obtained. Can do.
- variable magnification optical system ZL an example of a manufacturing method of the above-described variable magnification optical system ZL will be outlined. 38 and 39 show an example of a manufacturing method of the variable magnification optical system ZL.
- a third lens group G3 having power, a fourth lens group G4, a fifth lens group G5 having negative refractive power, and a sixth lens group G6 having positive refractive power, and the first lens group The distance between G1 and the second lens group G2, the distance between the second lens group G2 and the third lens group G3, the distance between the third lens group G3 and the fourth lens group G4, and the fourth lens group G4.
- Each lens is arranged so as to perform zooming by changing the distance between the fifth lens group G5 and the distance between the fifth lens group G5 and the sixth lens group G6 (step ST1).
- Each lens is arranged such that at least a part of any one of the first lens group G1 to the sixth lens group G6 can move so as to have a component perpendicular to the optical axis ( Step ST2).
- Each lens is arranged so as to perform zooming by changing the interval (step ST10).
- the first lens group G1 to the sixth lens group G6 at least a part of any one of the lens groups is configured to be movable so as to have a component perpendicular to the optical axis in order to correct image blur.
- Each lens is arranged (step ST20).
- a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 are arranged in order from the object side.
- the first lens group G1 and a biconvex lens L21, a cemented lens of a negative meniscus lens L22 having a concave surface on the image side and a positive meniscus lens L23 having a convex surface on the object side are arranged to form a second lens group G2.
- a cemented lens of a biconvex lens L31 and a negative meniscus lens L32 having a concave surface facing the object side is arranged as a third lens group G3, a biconcave lens L41 and a biconvex lens L42 are arranged, and a fourth lens group G4.
- a cemented lens of a biconcave lens L51 and a positive meniscus lens L52 having a convex surface facing the object side is arranged as a fifth lens group G5, and the biconvex lens L61, A lens L62 and a cemented lens of a biconcave lens L63, and the sixth lens group G6 to place a cemented lens of a biconvex lens L64 and a biconcave lens L65.
- the lens groups thus prepared are arranged in the above-described procedure to manufacture the variable magnification optical system ZL.
- variable magnification optical system ZL having a bright F value, a wide angle of view, and various aberrations corrected favorably.
- FIG. 21, FIG. 25, and FIG. 29 are sectional views showing the configuration and refractive power distribution of the variable magnification optical system ZL (ZL1 to ZL3) according to each example.
- the optical axis of each lens group when changing magnification from the wide-angle end state (W) to the telephoto end state (T) through the intermediate focal length state (M) is shown.
- the moving direction along is indicated by an arrow.
- variable magnification optical systems ZL1 to ZL3 In the upper part of the sectional view of the variable magnification optical systems ZL1 to ZL3, the moving direction of the focusing lens group when focusing on an object at a short distance from infinity is indicated by an arrow, and the image stabilizing lens group for correcting image blurring The state of VR is also shown.
- each reference code with respect to FIG. 21 according to the sixth embodiment is used independently for each embodiment in order to avoid complication of explanation due to an increase in the number of digits of the reference code. Therefore, even if the same reference numerals as those in the drawings according to the other embodiments are given, they are not necessarily in the same configuration as the other embodiments.
- Tables 6 to 8 are shown below, but these are tables of specifications in the sixth to eighth examples.
- d-line (wavelength 587.562 nm) and g-line (wavelength 435.835 nm) are selected as the calculation targets of the aberration characteristics.
- the surface number is the order of the optical surfaces from the object side along the light traveling direction
- R is the radius of curvature of each optical surface
- D is the next optical surface from each optical surface ( Or an optical surface distance to the image surface)
- nd is a refractive index of the material of the optical member with respect to the d-line
- ⁇ d is an Abbe number based on the d-line of the material of the optical member.
- (Di) indicates the surface interval between the i-th surface and the (i + 1) -th surface
- (aperture stop) indicates the aperture stop S.
- the optical surface is an aspherical surface
- the surface number is marked with *
- the column of curvature radius R indicates the paraxial curvature radius.
- f is the focal length of the entire lens system
- FNo is the F number
- ⁇ is the half angle of view (unit: °)
- Y is the maximum image height
- BF is the optical axis at the time of focusing on infinity.
- the distance from the last lens surface to the image surface I is expressed in terms of air length.
- TL is the distance from the front lens surface to the last lens surface on the optical axis when focusing on infinity. Each one is shown.
- Di is the surface distance between the i-th surface and the (i + 1) -th surface
- D0 is the axial air space between the object surface and the lens surface closest to the object side of the first lens group G1
- f represents the focal length of the entire lens system
- ⁇ represents the photographing magnification.
- mm is generally used for the focal length f, the radius of curvature R, the surface interval D, and other lengths, etc. unless otherwise specified.
- the optical system is not limited to this because the same optical performance can be obtained even when proportional expansion or proportional reduction is performed.
- the unit is not limited to “mm”, and other appropriate units can be used.
- variable magnification optical system ZL (ZL1) includes a first lens group G1 having negative refractive power arranged in order from the object side, and a first lens group having positive refractive power.
- a sixth lens group G6 is a sixth lens group G6.
- the first lens group G1 is composed of a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 arranged in order from the object side.
- the negative meniscus lens L11 has two aspheric surfaces.
- the biconcave lens L12 has an aspheric object side surface.
- the second lens group G2 includes a biconvex lens L21 arranged in order from the object side, a cemented lens of a negative meniscus lens L22 having a concave surface facing the image side, and a positive meniscus lens L23 having a convex surface facing the object side.
- the third lens group G3 is composed of a cemented lens composed of a biconvex lens L31 and a negative meniscus lens L32 having a concave surface directed toward the object side, which are arranged in order from the object side.
- the fourth lens group G4 is composed of a biconcave lens L41 and a biconvex lens L42 arranged in order from the object side.
- the fifth lens group G5 is composed of a cemented lens composed of a biconcave lens L51 and a positive meniscus lens L52 having a convex surface directed toward the object side, which are arranged in order from the object side.
- the positive meniscus lens L52 has an aspheric image side surface.
- the sixth lens group G6 includes a biconvex lens L61, a cemented lens of a biconvex lens L62 and a biconcave lens L63, and a cemented lens of a biconvex lens L64 and a biconcave lens L65, which are arranged in order from the object side.
- the biconcave lens L65 has an aspheric image side surface.
- An aperture stop S is provided between the third lens group G3 and the fourth lens group G4, and the aperture stop S constitutes the fourth lens group G4.
- the zooming from the wide-angle end state to the telephoto end state is performed by changing each lens group interval (the interval between the first lens group G1 and the second lens group G2, the interval between the second lens group G2 and the third lens group G3, The distance between the third lens group G3 and the fourth lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, and the distance between the fifth lens group G5 and the sixth lens group G6) are changed.
- the first lens group G1 is moved once to the image side, then moved to the object side, the second lens group G2 is moved to the object side, the third lens group G3 is moved to the object side, and the fourth This is done by moving the lens group G4 to the object side, moving the fifth lens group G5 to the object side, and moving the sixth lens group G6 to the object side.
- the aperture stop S is moved to the object side integrally with the fourth lens group G4.
- Focusing from infinity to a close object is performed by moving the second lens group G2 to the image side.
- image blur correction on the image plane I is performed by moving the fifth lens group G5 as a vibration-proof lens group VR so as to have a component perpendicular to the optical axis.
- the image stabilization coefficient ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction
- K rotational blurring at an angle ⁇ is used.
- the image stabilization coefficient in the wide-angle end state, is ⁇ 0.64 and the focal length is 16.40 mm. Therefore, the image stabilization lens group VR for correcting the rotational blur of 0.81 degrees is used.
- the amount of movement is -0.36 mm.
- the image stabilization coefficient In the intermediate focal length state, the image stabilization coefficient is ⁇ 0.76 and the focal length is 23.50 mm. Therefore, the movement amount of the image stabilization lens group VR for correcting the rotation blur of 0.68 degrees is ⁇ 0. 36 mm.
- the movement amount of the image stabilization lens group VR for correcting the rotational blur of 0.57 degrees is ⁇ 0. 36 mm.
- Table 6 shows the values of each item in the sixth example.
- Surface numbers 1 to 32 in Table 6 correspond to the optical surfaces m1 to m32 shown in FIG.
- Table 6 shows that the variable magnification optical system ZL1 according to the sixth example satisfies the conditional expressions (9) to (13).
- FIG. 22 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) at the time of focusing on infinity of the variable magnification optical system ZL1 according to Example 6.
- (A) shows a wide-angle end state
- (b) shows an intermediate focal length state
- (c) shows a telephoto end state.
- FIG. 23 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the zooming optical system ZL1 according to Example 6 is in close focus.
- FIG. 24 is a lateral aberration diagram when image blur correction is performed at the time of focusing on infinity of the variable magnification optical system ZL1 according to Example 6, where (a) is a wide-angle end state and (b) is an intermediate focus. The distance state, (c) shows the telephoto end state.
- FNO is the F number
- NA is the numerical aperture
- A is the half field angle (unit: °) with respect to each image height
- H0 is the object height.
- d indicates the d-line
- g indicates the aberration at the g-line.
- those without these descriptions show aberrations at the d-line.
- the value of the F number corresponding to the maximum aperture is shown.
- the numerical aperture value corresponding to the maximum aperture is shown.
- the solid line indicates the sagittal image plane
- the broken line indicates the meridional image plane.
- variable magnification optical system ZL1 has various aberrations from the wide-angle end state to the telephoto end state, and from the infinite focus state to the close-up focus state. It can be seen that it has a good optical performance. Further, it can be seen that the image formation performance is high at the time of image blur correction.
- variable magnification optical system ZL (ZL2) includes a first lens group G1 having negative refractive power arranged in order from the object side, and a first lens group G1 having positive refractive power.
- a sixth lens group G6 is a sixth lens group G6.
- the first lens group G1 is composed of a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 arranged in order from the object side.
- the negative meniscus lens L11 has two aspheric surfaces.
- the biconcave lens L12 has an aspheric object side surface.
- the second lens group G2 includes a biconvex lens L21 arranged in order from the object side, a cemented lens of a negative meniscus lens L22 having a concave surface facing the image side, and a positive meniscus lens L23 having a convex surface facing the object side.
- the third lens group G3 is composed of a cemented lens composed of a biconvex lens L31 and a negative meniscus lens L32 having a concave surface directed toward the object side, which are arranged in order from the object side.
- the fourth lens group G4 includes a negative meniscus lens L41 arranged in order from the object side and having a concave surface directed toward the object side, and a biconvex lens L42.
- the fifth lens group G5 is composed of a cemented lens composed of a biconcave lens L51 and a positive meniscus lens L52 having a convex surface directed toward the object side, which are arranged in order from the object side.
- the positive meniscus lens L52 has an aspheric image side surface.
- the sixth lens group G6 includes a biconvex lens L61, a cemented lens of a biconvex lens L62 and a biconcave lens L63, and a cemented lens of a biconvex lens L64 and a biconcave lens L65, which are arranged in order from the object side.
- the biconcave lens L65 has an aspheric image side surface.
- An aperture stop S is provided between the third lens group G3 and the fourth lens group G4, and the aperture stop S constitutes the fourth lens group G4.
- the zooming from the wide-angle end state to the telephoto end state is performed by changing each lens group interval (the interval between the first lens group G1 and the second lens group G2, the interval between the second lens group G2 and the third lens group G3, The distance between the third lens group G3 and the fourth lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, and the distance between the fifth lens group G5 and the sixth lens group G6) are changed.
- the first lens group G1 is fixed with respect to the image plane
- the second lens group G2 is moved to the object side
- the third lens group G3 is moved to the object side
- the fourth lens group G4 is moved to the image plane.
- the fifth lens group G5 is temporarily moved to the image side, then moved to the object side
- the sixth lens group G6 is moved to the object side.
- the aperture stop S is fixed to the image plane integrally with the fourth lens group G4.
- Focusing from infinity to a close object is performed by moving the second lens group G2 to the image side.
- image blur correction on the image plane I is performed by moving the fifth lens group G5 as a vibration-proof lens group VR so as to have a component perpendicular to the optical axis.
- the image stabilization coefficient ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction
- K rotational blurring at an angle ⁇ is used.
- the image stabilization coefficient in the wide-angle end state, is ⁇ 0.68 and the focal length is 16.40 mm. Therefore, the image stabilization lens group VR for correcting the rotational blur of 0.81 degrees is used.
- the amount of movement is -0.34 mm.
- the anti-vibration coefficient In the intermediate focal length state, the anti-vibration coefficient is ⁇ 0.83 and the focal length is 23.50 mm. Therefore, the movement amount of the anti-vibration lens group VR for correcting the rotation blur of 0.68 degrees is ⁇ 0. 34 mm.
- the image stabilization coefficient In the telephoto end state, the image stabilization coefficient is ⁇ 0.95 and the focal length is 34.00 mm. Therefore, the movement amount of the image stabilization lens group VR for correcting the rotational blur of 0.57 degrees is ⁇ 0. 35 mm.
- Table 7 shows the values of each item in the seventh example.
- Surface numbers 1 to 32 in Table 7 correspond to the optical surfaces m1 to m32 shown in FIG.
- variable magnification optical system ZL2 satisfies the conditional expressions (9) to (13).
- FIG. 26 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the variable magnification optical system ZL2 according to Example 7 is focused at infinity.
- (A) shows a wide-angle end state
- (b) shows an intermediate focal length state
- (c) shows a telephoto end state.
- FIG. 27 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the zooming optical system ZL2 according to Example 7 is in close focus.
- FIGS. 28A and 28B are lateral aberration diagrams when image blur correction is performed at the time of focusing on infinity of the variable magnification optical system ZL2 according to the seventh example.
- FIG. 28A is a wide-angle end state
- FIG. The distance state, (c) shows the telephoto end state.
- variable magnification optical system ZL2 has excellent various aberrations from the wide-angle end state to the telephoto end state and from the infinite focus state to the close-up focus state. It can be seen that it has a good optical performance. Further, it can be seen that the image formation performance is high at the time of image blur correction.
- variable magnification optical system ZL (ZL3) includes a first lens group G1 having negative refractive power arranged in order from the object side, and a first lens group having positive refractive power.
- a sixth lens group G6 is a sixth lens group G6.
- the first lens group G1 is composed of a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 arranged in order from the object side.
- the negative meniscus lens L11 has two aspheric surfaces.
- the biconcave lens L12 has an aspheric object side surface.
- the second lens group G2 includes a biconvex lens L21 arranged in order from the object side, a cemented lens of a negative meniscus lens L22 having a concave surface facing the image side, and a positive meniscus lens L23 having a convex surface facing the object side.
- the third lens group G3 is composed of a cemented lens composed of a biconvex lens L31 and a negative meniscus lens L32 having a concave surface directed toward the object side, which are arranged in order from the object side.
- the fourth lens group G4 includes a negative meniscus lens L41 arranged in order from the object side and having a concave surface directed toward the object side, and a biconvex lens L42.
- the biconvex lens L42 has an aspheric image side surface.
- the fifth lens group G5 is composed of a cemented lens composed of a biconcave lens L51 and a positive meniscus lens L52 having a convex surface directed toward the object side, which are arranged in order from the object side.
- the positive meniscus lens L52 has an aspheric image side surface.
- the sixth lens group G6 includes a biconvex lens L61, a biconvex lens L62, a cemented lens of a negative meniscus lens L63 having a concave surface directed toward the object side, and a biconvex lens L64 and a biconcave lens L65 arranged in order from the object side. It consists of a lens.
- the biconvex lens L62 has an aspheric object side surface.
- the biconcave lens L65 has an aspheric image side surface.
- An aperture stop S is provided between the third lens group G3 and the fourth lens group G4, and the aperture stop S constitutes the fourth lens group G4.
- the first lens group G1 is once moved to the image side and then moved to the object side so that the distance between the lens groups changes, and the second lens group G2 is moved.
- Move to the object side move the third lens group G3 to the object side, move the fourth lens group G4 to the object side, fix the fifth lens group G5 to the image plane, and move the sixth lens group G6 to This is done by moving to the object side.
- the aperture stop S is moved to the object side integrally with the fourth lens group G4.
- Focusing from infinity to a close object is performed by moving the second lens group G2 to the image side.
- image blur correction on the image plane I is performed by moving the fifth lens group G5 as a vibration-proof lens group VR so as to have a component perpendicular to the optical axis.
- the image stabilization coefficient ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction
- K rotational blurring at an angle ⁇ is used.
- the image stabilization coefficient is ⁇ 0.93 and the focal length is 16.40 mm in the wide-angle end state.
- the amount of movement is -0.25 mm.
- the image stabilization coefficient is ⁇ 1.02, and the focal length is 23.50 mm. .27 mm.
- the image stabilization coefficient is ⁇ 1.28 and the focal length is 34.00 mm. 26 mm.
- Table 8 shows the values of each item in the eighth example.
- Surface numbers 1 to 32 in Table 8 correspond to the optical surfaces m1 to m32 shown in FIG.
- variable magnification optical system ZL3 satisfies the conditional expressions (9) to (13).
- FIG. 30 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the zoom optical system ZL3 according to Example 8 is focused at infinity.
- (A) shows a wide-angle end state
- (b) shows an intermediate focal length state
- (c) shows a telephoto end state.
- FIG. 31 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the zooming optical system ZL3 according to Example 8 is in close focus.
- FIG. 32 is a lateral aberration diagram when image blur correction is performed at the time of focusing on infinity of the variable magnification optical system ZL3 according to Example 8, where (a) is a wide-angle end state and (b) is an intermediate focus. The distance state, (c) shows the telephoto end state.
- variable magnification optical system ZL3 has various aberrations from the wide-angle end state to the telephoto end state, and from the infinite focus state to the close-up focus state. It can be seen that it has a good optical performance. Further, it can be seen that the image formation performance is high at the time of image blur correction.
- variable magnification optical system having a bright F value of about F2.8 and a wide field angle of about 50 ° or more at a half field angle and in which various aberrations are well corrected is realized. be able to.
- variable magnification optical system ZL As a numerical example of the variable magnification optical system ZL, a six-group configuration is shown, but the present invention is not limited to this, and can be applied to other group configurations (for example, seven groups). Specifically, a configuration in which a lens or a lens group is added closest to the object side or a configuration in which a lens or a lens group is added closest to the image side may be used. In addition, it is conceivable to divide the first lens group G1 into a plurality of lens groups and move or fix one of them in a different locus during zooming. As described above, the fourth lens group G4 may have a negative refractive power or a positive refractive power.
- the lens group refers to a portion having at least one lens separated by an air interval that changes at the time of zooming or focusing.
- variable magnification optical system ZL in order to focus from infinity to a short distance object, a part of the lens group, one entire lens group, or a plurality of lens groups is moved in the optical axis direction as a focusing lens group.
- a configuration may be adopted.
- such a focusing lens group can be applied to autofocus, and is also suitable for driving by an autofocus motor (for example, an ultrasonic motor, a stepping motor, a voice coil motor, etc.).
- an autofocus motor for example, an ultrasonic motor, a stepping motor, a voice coil motor, etc.
- the entire second lens group G2 is the focusing lens group, but a part of the second lens group G2 may be the focusing lens group.
- the focusing lens group may be composed of one single lens and one cemented lens as described above, but there is no particular limitation on the number of lenses, and the focusing lens group is composed
- variable magnification optical system ZL either one of the entire lens group or the partial lens group is moved so as to have a component in a direction perpendicular to the optical axis, or rotated (oscillated) in an in-plane direction including the optical axis.
- a vibration-proof lens group that corrects image blur caused by camera shake may be used.
- the entire fifth lens group G5 can be most preferably an anti-vibration lens group, but a part of the fifth lens group G5 may be an anti-vibration lens group. It is also possible to use at least a part of the second lens group G2 or at least a part of the third lens group G3 as an anti-vibration lens group.
- the lens surface may be formed as a spherical surface, a flat surface, or an aspherical surface.
- the lens surface is a spherical surface or a flat surface, lens processing and assembly adjustment are facilitated, and deterioration of optical performance due to processing and assembly adjustment errors can be prevented. Further, even when the image plane is deviated, there is little deterioration in drawing performance.
- the lens surface is an aspheric surface
- the aspheric surface is an aspheric surface by grinding, a glass mold aspheric surface made of glass with an aspheric shape, or a composite aspheric surface made of resin with an aspheric shape on the glass surface. Any aspherical surface may be used.
- the lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.
- GRIN lens gradient index lens
- the aperture stop S can be preferably disposed integrally with the fourth lens group G4, in particular, the fourth lens group G4, but is moved separately from the fourth lens group G4. You may comprise. Further, the aperture stop S may be disposed in the fifth lens G5. In addition, a lens frame may be used instead of a member as an aperture stop.
- each lens surface may be provided with an antireflection film having a high transmittance in a wide wavelength region in order to reduce flare and ghost and achieve good optical performance with high contrast.
- the kind of antireflection film can be selected as appropriate. Further, the number and position of the antireflection film can be appropriately selected.
- the zoom optical system ZL can have a zoom ratio of about 1.5 to 2.5 times.
- the variable magnification optical system ZL can have a focal length (35 mm version equivalent) in the wide-angle end state of, for example, about 15 to 20 mm.
- the variable magnification optical system ZL can have an F value in the wide-angle end state of about 2.7 to 3.5, for example.
- the F value in the telephoto end state can be set to about 2.7 to 3.5, for example.
- the variable magnification optical system ZL can make the F value substantially constant (the amount of change is less than 10% of the F value in the telephoto end state) when the focal length state changes from the wide-angle end state to the telephoto end state.
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- Physics & Mathematics (AREA)
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- Optics & Photonics (AREA)
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- Adjustment Of Camera Lenses (AREA)
Abstract
Description
-0.400 < (D34T-D34W)/(D23T-D23W) < 1.000
-0.400 < f4/f3 < 0.450
但し、
D34T:望遠端状態における前記第3レンズ群と前記第4レンズ群との空気間隔、
D34W:広角端状態における前記第3レンズ群と前記第4レンズ群との空気間隔、
D23T:望遠端状態における前記第2レンズ群と前記第3レンズ群との空気間隔、
D23W:広角端状態における前記第2レンズ群と前記第3レンズ群との空気間隔、
f4:前記第4レンズ群の焦点距離、
f3:前記第3レンズ群の焦点距離。
-0.400 < (D34T-D34W)/(D23T-D23W) < 1.000
-0.400 < f4/f3 < 0.450
但し、
D34T:望遠端状態における前記第3レンズ群と前記第4レンズ群との空気間隔、
D34W:広角端状態における前記第3レンズ群と前記第4レンズ群との空気間隔、
D23T:望遠端状態における前記第2レンズ群と前記第3レンズ群との空気間隔、
D23W:広角端状態における前記第2レンズ群と前記第3レンズ群との空気間隔、
f4:前記第4レンズ群の焦点距離、
f3:前記第3レンズ群の焦点距離。
-0.400 < (D34T-D34W)/(D23T-D23W) < 1.000
-0.400 < f4/f3 < 0.450
但し、
D34T:望遠端状態における前記第3レンズ群と前記第4レンズ群との空気間隔、
D34W:広角端状態における前記第3レンズ群と前記第4レンズ群との空気間隔、
D23T:望遠端状態における前記第2レンズ群と前記第3レンズ群との空気間隔、
D23W:広角端状態における前記第2レンズ群と前記第3レンズ群との空気間隔、
f4:前記第4レンズ群の焦点距離、
f3:前記第3レンズ群の焦点距離。
-0.400 < (D34T-D34W)/(D23T-D23W) < 1.000
-0.400 < f4/f3 < 0.450
但し、
D34T:望遠端状態における前記第3レンズ群と前記第4レンズ群との空気間隔、
D34W:広角端状態における前記第3レンズ群と前記第4レンズ群との空気間隔、
D23T:望遠端状態における前記第2レンズ群と前記第3レンズ群との空気間隔、
D23W:広角端状態における前記第2レンズ群と前記第3レンズ群との空気間隔、
f4:前記第4レンズ群の焦点距離、
f3:前記第3レンズ群の焦点距離。
0.700 < f42/f4 < 1.700 …(1)
但し、
f42:第42レンズ群G42の焦点距離、
f4:第4レンズ群G4の焦点距離。
-0.400 < f4/f41 < 0.500 …(2)
但し、
f4:第4レンズ群G4の焦点距離、
f41:第41レンズ群G41の焦点距離。
0.200 < f1/f4 < 0.900 …(3)
但し、
f1:第1レンズ群G1の焦点距離、
f4:第4レンズ群G4の焦点距離。
1.100 < A(T3.5)/A(T4.0) < 5.000 …(4)
但し、
A(T3.5):望遠端状態においてF/3.5のF値に対応する軸上光線が、第42レンズ群G42の最も像側のレンズ面に形成された非球面を通る点での非球面量、
A(T4.0):望遠端状態においてF/4.0のF値に対応する軸上光線が、第42レンズ群G42の最も像側のレンズ面に形成された非球面を通る点での非球面量。
なお、前記非球面量とは、非球面の光軸上での、近似球面に対する非球面のサグ量を光軸に沿って測った量をいう。
X(y)=(y2/R)/{1+(1-κ×y2/R2)1/2}+A4×y4+A6×y6+A8×y8+A10×y10 …(a)
第1実施例について、図1~図4及び表1を用いて説明する。第1実施例に係る変倍光学系ZL(ZL1)は、図1に示すように、物体側から順に並んだ、負の屈折力を有する第1レンズ群G1と、正の屈折力を有する第2レンズ群G2と、正の屈折力を有する第3レンズ群G3と、負の屈折力を有する第4レンズ群G4と、正の屈折力を有する第5レンズ群G5からなる。
[レンズ諸元]
面番号 R D nd νd
*1 144.72719 3.000 1.76690 46.9
*2 16.78385 12.144 1.00000
*3 -146.50988 1.700 1.76690 46.9
4 112.07990 2.219 1.00000
5 -201.75172 1.700 1.49700 81.7
6 50.54104 1.200 1.00000
7 47.54818 5.221 1.75520 27.6
8 -219.28043 (D8) 1.00000
9 46.75733 3.989 1.64769 33.7
10 -272.45513 0.100 1.00000
11 50.36118 1.000 1.84666 23.8
12 19.87141 4.835 1.60342 38.0
13 62.52826 (D13) 1.00000
14 48.51662 6.297 1.49700 81.7
15 -35.93964 1.400 1.84666 23.8
16 -54.11218 (D16) 1.00000
17 (開口絞り) 3.263 1.00000
18 -42.29429 1.300 1.90366 31.3
19 142.58723 0.100 1.00000
20 81.26353 3.890 1.84666 23.8
21 -56.98684 2.000 1.00000
22 -67.55578 1.300 1.80400 46.6
23 33.77804 3.516 1.80518 25.4
*24 150.14014 (D24) 1.00000
25 32.07862 7.401 1.49700 81.7
26 -48.27408 0.100 1.00000
27 44.80816 8.054 1.49700 81.7
28 -28.00000 1.500 1.74950 35.2
29 112.01929 0.500 1.00000
30 60.44099 6.300 1.49700 81.7
31 -60.00000 2.000 1.80610 41.0
*32 983.65534 (D32) 1.00000
[非球面データ]
面 κ A4 A6 A8 A10
1 1.00000e+00 2.21315e-06 -2.13704e-09 -5.22294e-12 7.89630e-15
2 0.00000e+00 9.86610e-06 -4.32155e-09 1.14702e-10 -3.66795e-13
3 1.00000e+00 -2.67699e-06 1.28816e-10 4.17268e-11 -1.97814e-13
24 1.00000e+00 -1.85215e-06 1.82819e-10 7.49821e-12 -1.11725e-14
32 1.00000e+00 1.67690e-05 8.61235e-09 1.61417e-11 9.86306e-15
[各種データ]
W M T
f 16.40 23.50 34.00
FNo 2.85 2.84 2.85
ω 53.9 40.6 30.1
Y 20.00 20.00 20.00
TL 159.619 159.618 159.618
BF 27.426 36.177 49.659
[可変間隔データ]
無限遠合焦時 至近距離合焦時
W M T W M T
D0 ∞ ∞ ∞ 340.38 340.38 340.38
β - - - -0.0451 -0.0649 -0.0941
f 16.40 23.50 34.00 - - -
D8 25.600 10.000 2.000 27.097 11.678 3.852
D13 5.565 12.410 5.867 4.069 10.733 4.016
D16 3.000 9.997 14.864 3.000 9.997 14.864
D24 12.000 5.006 1.200 12.000 5.006 1.200
D32 27.426 36.177 49.659 27.426 36.177 49.659
[レンズ群データ]
レンズ群 始面 焦点距離
第1レンズ群 1 -22.99
第2レンズ群 9 81.72
第3レンズ群 14 62.91
第4レンズ群 17 -50.13
第41レンズ群 17 -648.11
第42レンズ群 22 -57.48
第5レンズ群 25 38.14
[条件式対応値]
条件式(1) f42/f4 = 1.15
条件式(2) f4/f41 = 0.077
条件式(3) f1/f4 = 0.459
条件式(4) A(T3.5)/A(T4.0) = 1.735
(A(T3.5)=-0.0180,A(T4.0)=-0.0104)
第2実施例について、図5~図8及び表2を用いて説明する。第2実施例に係る変倍光学系ZL(ZL2)は、図5に示すように、物体側から順に並んだ、負の屈折力を有する第1レンズ群G1と、正の屈折力を有する第2レンズ群G2と、正の屈折力を有する第3レンズ群G3と、負の屈折力を有する第4レンズ群G4と、正の屈折力を有する第5レンズ群G5からなる。
[レンズ諸元]
面番号 R D nd νd
*1 155.70823 3.000 1.76690 46.9
*2 16.71640 13.373 1.00000
*3 -200.00000 1.800 1.76690 46.9
4 150.01535 2.786 1.00000
5 -91.03331 1.700 1.49782 82.6
6 143.99051 1.200 1.00000
7 58.46345 4.345 1.75520 27.6
8 -434.09219 (D8) 1.00000
9 63.66223 3.791 1.57957 53.7
10 -122.54394 0.100 1.00000
11 62.33486 1.400 1.84666 23.8
12 22.85521 4.835 1.60342 38.0
13 130.87641 (D13) 1.00000
14 64.13663 4.239 1.49782 82.6
15 -84.26911 (D15) 1.00000
16 (開口絞り) 3.263 1.00000
17 -45.56608 1.000 1.80400 46.6
18 3172.25670 0.100 1.00000
19 102.14214 2.827 1.84666 23.8
20 -141.92393 2.000 1.00000
21 -108.76161 1.000 1.80400 46.6
22 29.84706 3.696 1.80518 25.4
*23 110.49500 (D23) 1.00000
24 33.41270 8.825 1.49782 82.6
25 -24.42987 1.500 1.80440 39.6
26 -40.93874 0.100 1.00000
27 30.63415 1.500 1.80100 34.9
28 16.29239 13.887 1.49782 82.6
29 -35.27572 1.938 1.00000
30 -31.58375 2.000 1.80604 40.7
*31 -200.00000 (D31) 1.00000
[非球面データ]
面 κ A4 A6 A8 A10
1 1.00000e+00 1.06028e-06 1.59159e-09 -7.12097e-12 6.57046e-15
2 0.00000e+00 6.61060e-06 -1.49507e-09 8.61304e-11 -2.65762e-13
3 1.00000e+00 -3.92122e-06 -4.32274e-09 3.03947e-11 -1.42986e-13
23 1.00000e+00 -1.67719e-06 -3.27153e-09 3.18352e-11 -8.33990e-14
31 1.00000e+00 8.89940e-06 -7.38491e-09 2.38442e-11 -1.86910e-13
[各種データ]
W M T
f 16.40 23.50 34.00
FNo 2.90 2.89 2.89
ω 53.8 40.4 30.1
Y 20.00 20.00 20.00
TL 161.618 157.904 159.837
BF 27.338 34.304 48.377
[可変間隔データ]
無限遠合焦時 至近距離合焦時
W M T W M T
D0 ∞ ∞ ∞ 338.38 342.10 340.16
β - - - -0.0452 -0.0644 -0.0939
f 16.40 23.50 34.00 - - -
D8 25.186 11.390 2.000 26.735 13.032 3.804
D13 7.484 7.667 5.628 5.935 6.025 3.825
D15 3.000 11.823 16.426 3.000 11.823 16.426
D23 12.405 6.515 1.200 12.405 6.515 1.200
D31 27.338 34.304 48.377 27.338 34.304 48.377
[レンズ群データ]
レンズ群 始面 焦点距離
第1レンズ群 1 -23.61
第2レンズ群 9 79.09
第3レンズ群 14 73.86
第4レンズ群 16 -53.41
第41レンズ群 16 -294.62
第42レンズ群 21 -67.66
第5レンズ群 24 38.67
[条件式対応値]
条件式(1) f42/f4 = 1.27
条件式(2) f4/f41 = 0.181
条件式(3) f1/f4 = 0.442
条件式(4) A(T3.5)/A(T4.0) = 1.759
(A(T3.5)=-0.0183,A(T4.0)=-0.0104)
-0.400 < f4/f3 < 0.450 …(6)
但し、
D34T:望遠端状態における第3レンズ群G3と第4レンズ群G4との空気間隔、
D34W:広角端状態における第3レンズ群G3と第4レンズ群G4との空気間隔、
D23T:望遠端状態における第2レンズ群G2と第3レンズ群G3との空気間隔、
D23W:広角端状態における第2レンズ群G2と第3レンズ群G3との空気間隔、
f4:第4レンズ群G4の焦点距離、
f3:第3レンズ群G3の焦点距離。
0.200 < f1/f4 < 0.900 …(7)
但し、
f1:第1レンズ群G1の焦点距離。
1.100 < A(T3.5)/A(T4.0) < 5.000 …(8)
但し、
A(T3.5):望遠端状態においてF/3.5のF値に対応する軸上光線が、第4レンズ群G4の最も像側のレンズ面に形成された非球面を通る点での非球面量、
A(T4.0):望遠端状態においてF/4.0のF値に対応する軸上光線が、第4レンズ群G4の最も像側のレンズ面に形成された非球面を通る点での非球面量。
なお、前記非球面量とは、非球面の光軸上での、近似球面に対する非球面のサグ量を光軸に沿って測った量をいう。
-0.400 < (D34T-D34W)/(D23T-D23W) < 1.000 …(5)
-0.400 < f4/f3 < 0.450 …(6)
但し、
D34T:望遠端状態における前記第3レンズ群と前記第4レンズ群との空気間隔、
D34W:広角端状態における前記第3レンズ群と前記第4レンズ群との空気間隔、
D23T:望遠端状態における前記第2レンズ群と前記第3レンズ群との空気間隔、
D23W:広角端状態における前記第2レンズ群と前記第3レンズ群との空気間隔、
f4:前記第4レンズ群の焦点距離、
f3:前記第3レンズ群の焦点距離。
-0.400 < (D34T-D34W)/(D23T-D23W) < 1.000 …(5)
-0.400 < f4/f3 < 0.450 …(6)
但し、
D34T:望遠端状態における第3レンズ群G3と第4レンズ群G4との空気間隔、
D34W:広角端状態における第3レンズ群G3と第4レンズ群G4との空気間隔、
D23T:望遠端状態における第2レンズ群G2と第3レンズ群G3との空気間隔、
D23W:広角端状態における第2レンズ群G2と第3レンズ群G3との空気間隔、
f4:第4レンズ群G4の焦点距離、
f3:第3レンズ群G3の焦点距離。
X(y)=(y2/R)/{1+(1-κ×y2/R2)1/2}+A4×y4+A6×y6+A8×y8+A10×y10 …(a)
第3実施例について、図9~図12及び表3を用いて説明する。第3実施例に係る変倍光学系ZL(ZL1)は、図9に示すように、物体側から順に並んだ、負の屈折力を有する第1レンズ群G1と、正の屈折力を有する第2レンズ群G2と、負の屈折力を有する第3レンズ群G3と、負の屈折力を有する第4レンズ群G4と、正の屈折力を有する第5レンズ群G5とからなる。
[レンズ諸元]
面番号 R D nd νd
*1 168.38636 3.000 1.76690 46.9
*2 16.71640 12.168 1.00000
*3 -132.14592 1.700 1.76690 46.9
4 134.95206 1.900 1.00000
5 -243.29246 1.700 1.49700 81.7
6 51.76998 1.200 1.00000
7 49.16596 5.282 1.75520 27.6
8 -184.55701 (D8) 1.00000
9 42.28900 4.491 1.64769 33.7
10 -283.89703 0.100 1.00000
11 49.70559 0.999 1.84666 23.8
12 19.12296 4.835 1.60342 38.0
13 52.76752 (D13) 1.00000
14 53.11057 6.255 1.49700 81.7
15 -33.51166 1.400 1.84666 23.8
16 -47.05744 (D16) 1.00000
17 (開口絞り) 3.263 1.00000
18 -39.36811 1.300 1.90366 31.3
19 217.23501 0.099 1.00000
20 80.07138 3.361 1.84666 23.8
21 -72.96748 (D21) 1.00000
22 -75.94681 1.300 1.80400 46.6
23 32.26272 3.644 1.80518 25.4
*24 182.89657 (D24) 1.00000
25 31.94239 7.389 1.49700 81.7
26 -48.60077 0.100 1.00000
27 41.92922 8.209 1.49700 81.7
28 -28.00000 1.500 1.74950 35.2
29 117.62625 0.518 1.00000
30 67.34233 7.882 1.49700 81.7
31 -60.00000 2.000 1.80610 41.0
*32 468.65935 (D32) 1.00000
[非球面データ]
面 κ A4 A6 A8 A10
1 1.00000e+00 1.93012e-06 -2.42361e-09 -3.50001e-12 6.82597e-15
2 0.00000e+00 9.23814e-06 -3.45504e-09 9.54947e-11 -3.15535e-13
3 1.00000e+00 -2.60282e-06 -3.46987e-09 5.33701e-11 -2.20299e-13
24 1.00000e+00 -1.37016e-06 -1.51547e-09 2.18954e-11 -6.25589e-14
32 1.00000e+00 1.88211e-05 1.24803e-08 1.76466e-11 3.26274e-14
[各種データ]
W M T
f 16.40 23.50 34.00
FNo 2.88 2.85 2.87
ω 54.0 39.8 29.5
Y 20.00 20.00 20.00
TL 159.620 156.503 159.635
BF 25.339 31.627 44.226
[可変間隔データ]
無限遠合焦時 至近距離合焦時
W M T W M T
D0 ∞ ∞ ∞ 340.38 343.50 340.37
β - - - -0.0451 -0.0643 -0.0942
f 16.40 23.50 34.00 - - -
D8 25.600 11.916 2.000 27.194 13.664 3.990
D13 6.085 6.085 6.085 4.491 4.337 4.095
D16 3.000 9.806 18.528 3.000 9.806 18.528
D21 2.000 5.039 2.000 2.000 5.039 2.000
D24 12.000 6.434 1.200 12.000 6.434 1.200
D32 25.339 31.627 44.226 25.339 31.627 44.226
[レンズ群データ]
レンズ群 始面 焦点距離
第1レンズ群 1 -23.62
第2レンズ群 9 40.58
第21レンズ群 9 84.14
第22レンズ群 14 60.13
第3レンズ群 17 -235.40
第4レンズ群 22 -66.32
第5レンズ群 25 37.85
[条件式対応値]
条件式(5) (D34T-D34W)/(D23T-D23W) = 0.000
条件式(6) f4/f3 = 0.282
条件式(7) f1/f4 = 0.356
条件式(8) A(T3.5)/A(T4.0) = 1.736
(A(T3.5)=-0.0112,A(T4.0)=-0.0065)
第4実施例について、図13~図16及び表4を用いて説明する。第4実施例に係る変倍光学系ZL(ZL2)は、図13に示すように、物体側から順に並んだ、負の屈折力を有する第1レンズ群G1と、正の屈折力を有する第2レンズ群G2と、負の屈折力を有する第3レンズ群G3と、負の屈折力を有する第4レンズ群G4と、正の屈折力を有する第5レンズ群G5とからなる。
[レンズ諸元]
面番号 R D nd νd
*1 193.25434 3.000 1.76690 46.9
*2 17.13465 12.086 1.00000
*3 -200.00000 1.700 1.76690 46.9
4 99.36571 1.934 1.00000
5 -702.67887 1.700 1.49700 81.7
6 45.42128 1.200 1.00000
7 45.47188 6.037 1.75520 27.6
8 -335.54839 (D8) 1.00000
9 52.73871 6.048 1.64769 33.7
10 -167.28882 0.100 1.00000
11 55.01437 1.000 1.84666 23.8
12 20.79608 4.835 1.60342 38.0
13 68.48478 (D13) 1.00000
14 48.68485 6.332 1.49700 81.7
15 -36.34788 1.400 1.84666 23.8
16 -49.89711 (D16) 1.00000
17 (開口絞り) 3.263 1.00000
18 -37.12733 1.300 1.90366 31.3
19 -213.84119 0.100 1.00000
20 -3697.41390 2.901 1.84666 23.8
21 -52.57832 (D21) 1.00000
22 -113.43754 1.300 1.80400 46.6
23 27.30005 3.766 1.80518 25.4
*24 90.97626 (D24) 1.00000
25 32.82370 7.685 1.49700 81.7
26 -46.49495 0.100 1.00000
27 47.76928 8.611 1.49700 81.7
28 -28.00000 1.500 1.74950 35.2
29 179.04198 0.500 1.00000
30 80.91519 5.824 1.49700 81.7
31 -60.00000 2.000 1.80610 41.0
*32 728.12773 (D32) 1.00000
[非球面データ]
面 κ A4 A6 A8 A10
1 1.00000e+00 2.55253e-06 -2.06216e-09 -3.73822e-12 6.17187e-15
2 0.00000e+00 8.20822e-06 -1.94550e-09 8.73648e-11 -2.71723e-13
3 1.00000e+00 -2.79582e-06 -3.37193e-09 4.74900e-11 -1.88234e-13
24 1.00000e+00 -1.52089e-06 2.03534e-09 7.28188e-12 -3.57628e-14
32 1.00000e+00 1.34254e-05 8.78505e-09 -2.82571e-12 6.66429e-14
[各種データ]
W M T
f 16.40 24.50 34.00
FNo 2.85 2.88 2.87
ω 53.9 38.5 29.6
Y 20.00 20.00 20.00
TL 163.818 160.810 162.492
BF 26.615 31.660 41.455
[可変間隔データ]
無限遠合焦時 至近距離合焦時
W M T W M T
D0 ∞ ∞ ∞ 336.18 339.19 337.51
β - - - -0.0456 -0.0679 -0.0949
f 16.40 24.50 34.00 - - -
D8 24.176 10.171 2.298 25.710 11.867 4.175
D13 5.770 5.770 5.770 4.235 4.074 3.893
D16 3.000 14.001 23.546 3.000 14.001 23.546
D21 2.035 4.457 2.000 2.035 4.457 2.000
D24 16.000 8.528 1.200 16.000 8.528 1.200
D32 26.615 31.660 41.455 26.615 31.660 41.455
[レンズ群データ]
レンズ群 始面 焦点距離
第1レンズ群 1 -23.00
第2レンズ群 9 39.44
第21レンズ群 9 83.59
第22レンズ群 14 58.05
第3レンズ群 17 -297.53
第4レンズ群 22 -62.23
第5レンズ群 25 38.73
[条件式対応値]
条件式(5) (D34T-D34W)/(D23T-D23W) = -0.002
条件式(6) f4/f3 = 0.209
条件式(7) f1/f4 = 0.370
条件式(8) A(T3.5)/A(T4.0) = 1.694
(A(T3.5)=-0.0079,A(T4.0)=-0.0047)
第5実施例について、図17~図20及び表5を用いて説明する。第5実施例に係る変倍光学系ZL(ZL3)は、図17に示すように、物体側から順に並んだ、負の屈折力を有する第1レンズ群G1と、正の屈折力を有する第2レンズ群G2と、正の屈折力を有する第3レンズ群G3と、負の屈折力を有する第4レンズ群G4と、正の屈折力を有する第5レンズ群G5とからなる。
[レンズ諸元]
面番号 R D nd νd
*1 207.85739 3.000 1.76690 46.9
*2 16.71640 12.075 1.00000
*3 -126.64950 1.700 1.76690 46.9
4 138.69829 1.900 1.00000
5 -305.30737 1.700 1.49700 81.7
6 49.66923 1.200 1.00000
7 48.16519 5.621 1.75520 27.6
8 -201.97549 (D8) 1.00000
9 42.04729 8.608 1.64769 33.7
10 -374.37994 0.100 1.00000
11 49.19749 1.000 1.84666 23.8
12 19.13552 4.835 1.60342 38.0
13 51.73593 (D13) 1.00000
14 46.66560 6.999 1.49700 81.7
15 -31.81612 1.400 1.84666 23.8
16 -46.26169 (D16) 1.00000
17 (開口絞り) 3.263 1.00000
18 -41.32099 1.300 1.90366 31.3
19 -114.37285 0.100 1.00000
20 118.37175 3.171 1.84666 23.8
*21 -71.92314 (D21) 1.00000
22 -71.28950 1.300 1.80400 46.6
23 28.48969 3.132 1.80518 25.4
*24 57.82940 (D24) 1.00000
25 32.18491 7.336 1.49700 81.7
26 -48.06359 0.100 1.00000
*27 101.54911 8.015 1.49700 81.7
28 -28.00000 1.500 1.74950 35.2
29 -184.91003 0.500 1.00000
30 50.32451 6.043 1.49700 81.7
31 -60.00000 2.000 1.80610 41.0
*32 136.26267 (D32) 1.00000
[非球面データ]
面 κ A4 A6 A8 A10
1 1.00000e+00 1.94090e-06 -1.49023e-09 -3.81067e-12 6.84376e-15
2 0.00000e+00 6.00339e-06 2.07998e-09 7.93413e-11 -2.62472e-13
3 1.00000e+00 -3.68171e-06 -3.47017e-09 4.98784e-11 -2.14759e-13
21 1.00000e+00 2.76768e-06 -5.47451e-09 1.50258e-11 -4.82676e-14
24 1.00000e+00 -4.45941e-06 2.05441e-09 2.73993e-11 -5.84691e-14
27 1.00000e+00 1.45862e-06 -4.94280e-09 -2.35002e-11 5.70437e-14
32 1.00000e+00 1.61827e-05 1.00472e-08 -2.91720e-11 1.40466e-13
[各種データ]
W M T
f 16.40 23.50 34.00
FNo 2.81 2.81 2.87
ω 54.1 39.5 29.0
Y 20.00 20.00 20.00
TL 163.819 160.497 163.297
BF 25.292 29.551 37.861
[可変間隔データ]
無限遠合焦時 至近距離合焦時
W M T W M T
D0 ∞ ∞ ∞ 336.18 339.50 336.70
β - - - -0.0457 -0.0652 -0.0954
f 16.40 23.50 34.00 - - -
D8 25.802 11.237 2.000 27.363 12.989 4.002
D13 6.063 6.063 6.063 4.502 4.311 4.061
D16 3.000 11.092 19.651 3.000 11.092 19.651
D21 2.000 5.157 8.625 2.000 5.157 8.625
D24 13.764 9.499 1.200 13.764 9.499 1.200
D32 25.292 29.551 37.861 25.292 29.551 37.861
[レンズ群データ]
レンズ群 始面 焦点距離
第1レンズ群 1 -23.00
第2レンズ群 9 40.81
第21レンズ群 9 86.19
第22レンズ群 14 56.83
第3レンズ群 17 181.29
第4レンズ群 22 -39.15
第5レンズ群 25 37.83
[条件式対応値]
条件式(5) (D34T-D34W)/(D23T-D23W) = 0.398
条件式(6) f4/f3 = -0.216
条件式(7) f1/f4 = 0.588
条件式(8) A(T3.5)/A(T4.0) = 1.714
(A(T3.5)=-0.0169,A(T4.0)=-0.0099)
-0.500 < f5/f4 < 0.500 …(9)
但し、
f5:第5レンズ群G5の焦点距離、
f4:第4レンズ群G4の焦点距離。
0.300 < (-f1)/f6 < 0.900 …(10)
但し、
f1:第1レンズ群G1の焦点距離、
f6:第6レンズ群G6の焦点距離。
-0.400 < f1/f4 < 0.400 …(11)
但し、
f1:第1レンズ群G1の焦点距離、
f4:第4レンズ群G4の焦点距離。
但し、
A(T3.5):望遠端状態においてF/3.5のF値に対応する軸上光線が、第5レンズ群G5の最も像側のレンズ面に形成された非球面を通る点での非球面量、
A(T4.0):望遠端状態においてF/4.0のF値に対応する軸上光線が、第5レンズ群G5の最も像側のレンズ面に形成された非球面を通る点での非球面量。
なお、前記非球面量とは、非球面の光軸上での、近似球面に対する非球面のサグ量を光軸に沿って測った量をいう。
但し、
f2:第2レンズ群G2の焦点距離、
f3:第3レンズ群G3の焦点距離。
X(y)=(y2/R)/{1+(1-κ×y2/R2)1/2}+A4×y4+A6×y6+A8×y8+A10×y10 …(a)
第6実施例について、図21~図24及び表6を用いて説明する。第6実施例に係る変倍光学系ZL(ZL1)は、図21に示すように、物体側から順に並んだ、負の屈折力を有する第1レンズ群G1と、正の屈折力を有する第2レンズ群G2と、正の屈折力を有する第3レンズ群G3と、負の屈折力を有する第4レンズ群G4と、負の屈折力を有する第5レンズ群G5と、正の屈折力を有する第6レンズ群G6とからなる。
[レンズ諸元]
面番号 R D nd νd
*1 151.57543 3.000 1.76690 46.9
*2 16.71640 11.694 1.00000
*3 -185.40568 1.700 1.76690 46.9
4 99.91509 2.170 1.00000
5 -274.19230 1.700 1.49700 81.7
6 49.10090 1.360 1.00000
7 48.81906 5.099 1.75520 27.6
8 -219.36815 (D8) 1.00000
9 46.26831 4.082 1.64769 33.7
10 -187.68256 0.100 1.00000
11 56.37531 1.000 1.84666 23.8
12 19.88291 4.835 1.60342 38.0
13 62.23978 (D13) 1.00000
14 50.91403 6.157 1.49700 81.7
15 -37.11951 1.400 1.84666 23.8
16 -49.12403 (D16) 1.00000
17 (開口絞り) 3.263 1.00000
18 -37.34848 1.300 1.90366 31.3
19 339.67895 1.232 1.00000
20 109.52156 3.549 1.84666 23.8
21 -57.24803 (D21) 1.00000
22 -96.39093 1.300 1.80400 46.6
23 33.70480 3.529 1.80518 25.4
*24 130.78415 (D24) 1.00000
25 30.94169 7.448 1.49700 81.7
26 -51.16421 0.100 1.00000
27 51.26380 7.685 1.49700 81.7
28 -28.22102 1.500 1.74950 35.2
29 70.36935 1.879 1.00000
30 44.36240 6.229 1.49700 81.7
31 -60.00000 2.000 1.80610 41.0
*32 8552.25410 (D32) 1.00000
[非球面データ]
面 κ A4 A6 A8 A10
1 1.00000e+00 1.52765e-06 -2.32063e-09 -3.31568e-12 6.28041e-15
2 0.00000e+00 8.58810e-06 -3.90468e-10 8.78796e-11 -3.06104e-13
3 1.00000e+00 -2.38304e-06 2.33737e-10 4.37038e-11 -1.95636e-13
24 1.00000e+00 -1.34495e-06 -1.30741e-09 1.88294e-11 -4.98252e-14
32 1.00000e+00 1.59358e-05 1.01734e-08 8.62033e-12 3.21603e-14
[各種データ]
W M T
f 16.40 23.50 34.00
FNo 2.88 2.88 2.93
ω 54.0 40.5 29.6
Y 20.00 20.00 20.00
TL 163.818 161.015 162.021
BF 26.430 35.126 45.401
[可変間隔データ]
無限遠合焦時 至近距離合焦時
W M T W M T
D0 ∞ ∞ ∞ 336.18 338.99 337.98
β - - - -0.0457 -0.0652 -0.0949
f 16.40 23.50 34.00 - - -
D8 25.987 9.457 2.038 27.527 11.210 3.979
D13 7.006 12.655 5.930 5.466 10.902 3.989
D16 3.000 9.141 20.142 3.000 9.141 20.142
D21 2.000 3.664 2.000 2.000 3.664 2.000
D24 14.086 5.661 1.200 14.086 5.661 1.200
D32 26.430 35.126 45.401 26.430 35.126 45.401
[レンズ群データ]
レンズ群 始面 焦点距離
第1レンズ群 1 -22.97
第2レンズ群 9 85.91
第3レンズ群 14 57.96
第4レンズ群 17 -366.64
第5レンズ群 22 -68.50
第6レンズ群 25 41.25
[条件式対応値]
条件式(9) f5/f4 = 0.187
条件式(10) (-f1)/f6 = 0.557
条件式(11) f1/f4 = 0.063
条件式(12) A(T3.5)/A(T4.0) = 1.735
(A(T3.5)=-0.0111,A(T4.0)=-0.0064)
条件式(13) f2/f3 = 1.482
第7実施例について、図25~図28及び表7を用いて説明する。第7実施例に係る変倍光学系ZL(ZL2)は、図25に示すように、物体側から順に並んだ、負の屈折力を有する第1レンズ群G1と、正の屈折力を有する第2レンズ群G2と、正の屈折力を有する第3レンズ群G3と、負の屈折力を有する第4レンズ群G4と、負の屈折力を有する第5レンズ群G5と、正の屈折力を有する第6レンズ群G6とからなる。
[レンズ諸元]
面番号 R D nd νd
*1 200.42947 3.000 1.76690 46.9
*2 17.07497 11.709 1.00000
*3 -200.00000 1.700 1.76690 46.9
4 109.91543 1.900 1.00000
5 -693.49354 1.700 1.49700 81.7
6 49.25847 1.200 1.00000
7 50.08128 4.923 1.75520 27.6
8 -295.12270 (D8) 1.00000
9 56.93713 4.745 1.64769 33.7
10 -156.65949 0.100 1.00000
11 47.36415 1.000 1.84666 23.8
12 21.40251 4.835 1.60342 38.0
13 47.99942 (D13) 1.00000
14 45.23118 6.615 1.49700 81.7
15 -36.27556 1.400 1.84666 23.8
16 -49.02120 (D16) 1.00000
17 (開口絞り) 3.263 1.00000
18 -34.76577 1.300 1.90366 31.3
19 -208.11349 0.100 1.00000
20 1901.47190 3.098 1.84666 23.8
21 -49.48608 (D21) 1.00000
22 -126.18353 1.300 1.80400 46.6
23 29.00114 3.536 1.80518 25.4
*24 83.38799 (D24) 1.00000
25 32.33148 7.547 1.49700 81.7
26 -47.61976 0.100 1.00000
27 54.51882 7.863 1.49700 81.7
28 -28.00000 1.500 1.74950 35.2
29 206.04990 0.500 1.00000
30 66.17138 6.083 1.49700 81.7
31 -60.00000 2.000 1.80610 41.0
*32 861.15398 (D32) 1.00000
[非球面データ]
面 κ A4 A6 A8 A10
1 1.00000e+00 7.17332e-07 5.06827e-10 -3.44033e-12 4.39234e-15
2 0.00000e+00 2.76313e-06 5.96322e-09 1.96762e-11 -9.83208e-14
3 1.00000e+00 -3.91032e-06 1.30563e-09 7.32124e-12 -8.19441e-14
24 1.00000e+00 -1.84007e-06 -1.52537e-09 3.88829e-11 -1.13936e-13
32 1.00000e+00 1.32449e-05 9.98520e-09 -1.19528e-11 7.08648e-14
[各種データ]
W M T
f 16.40 23.50 34.00
FNo 2.89 2.89 2.88
ω 54.1 40.7 29.4
Y 20.00 20.00 20.00
TL 163.818 163.818 163.818
BF 27.200 36.104 42.239
[可変間隔データ]
無限遠合焦時 至近距離合焦時
W M T W M T
D0 ∞ ∞ ∞ 336.18 336.18 336.18
β - - - -0.0457 -0.0658 -0.0954
f 16.40 23.50 34.00 - - -
D8 26.014 8.000 3.463 27.625 9.934 5.532
D13 6.348 17.201 6.207 4.737 15.267 4.137
D16 3.000 10.164 25.693 3.000 10.164 25.693
D21 3.470 4.520 2.000 3.470 4.520 2.000
D24 14.768 4.813 1.200 14.768 4.813 1.200
D32 27.200 36.102 42.239 27.200 36.102 42.239
[レンズ群データ]
レンズ群 始面 焦点距離
第1レンズ群 1 -23.00
第2レンズ群 9 92.82
第3レンズ群 14 54.87
第4レンズ群 17 -326.41
第5レンズ群 22 -61.92
第6レンズ群 25 38.74
[条件式対応値]
条件式(9) f5/f4 = 0.190
条件式(10) (-f1)/f6 = 0.594
条件式(11) f1/f4 = 0.070
条件式(12) A(T3.5)/A(T4.0) = 1.707
(A(T3.5)=-0.0102,A(T4.0)=-0.0060)
条件式(13) f2/f3 = 1.692
第8実施例について、図29~図32及び表8を用いて説明する。第8実施例に係る変倍光学系ZL(ZL3)は、図29に示すように、物体側から順に並んだ、負の屈折力を有する第1レンズ群G1と、正の屈折力を有する第2レンズ群G2と、正の屈折力を有する第3レンズ群G3と、正の屈折力を有する第4レンズ群G4と、負の屈折力を有する第5レンズ群G5と、正の屈折力を有する第6レンズ群G6とからなる。
[レンズ諸元]
面番号 R D nd νd
*1 208.62300 3.000 1.76690 46.9
*2 16.71640 11.616 1.00000
*3 -175.02069 1.700 1.76690 46.9
4 110.47412 1.976 1.00000
5 -309.93761 1.700 1.49700 81.7
6 50.80447 1.826 1.00000
7 48.81082 5.374 1.75520 27.6
8 -305.35584 (D8) 1.00000
9 44.00730 5.080 1.64769 33.7
10 -220.95399 0.100 1.00000
11 45.68721 1.000 1.84666 23.8
12 18.95011 4.835 1.60342 38.0
13 51.37666 (D13) 1.00000
14 52.59784 6.421 1.49700 81.7
15 -32.17632 1.400 1.84666 23.8
16 -47.86287 (D16) 1.00000
17 (開口絞り) 3.263 1.00000
18 -46.57030 1.300 1.90366 31.3
19 -281.42063 0.100 1.00000
20 109.62358 3.171 1.84666 23.8
*21 -72.38183 (D21) 1.00000
22 -78.11006 1.300 1.80400 46.6
23 29.63097 3.221 1.80518 25.4
*24 65.36297 (D24) 1.00000
25 33.81626 7.605 1.49700 81.7
26 -44.63696 0.100 1.00000
*27 86.44474 7.374 1.49700 81.7
28 -28.00000 1.500 1.74950 35.2
29 -250.50625 0.500 1.00000
30 46.84110 6.390 1.49700 81.7
31 -60.00000 2.000 1.80610 41.0
*32 122.72298 (D32) 1.00000
[非球面データ]
面 κ A4 A6 A8 A10
1 1.00000e+00 1.39337e-06 -1.56403e-09 -2.43613e-12 5.76634e-15
2 0.00000e+00 6.81735e-06 -4.70283e-09 9.66754e-11 -2.75609e-13
3 1.00000e+00 -2.75105e-06 -4.68963e-09 6.12032e-11 -2.39910e-13
21 1.00000e+00 2.96251e-06 -3.94707e-09 1.51980e-11 -4.38181e-14
24 1.00000e+00 -3.46562e-06 2.48929e-09 1.12700e-11 -3.06893e-14
27 1.00000e+00 1.85219e-06 -2.91274e-09 -1.43450e-11 1.77124e-14
32 1.00000e+00 1.48107e-05 7.00561e-09 -1.17225e-11 8.02298e-14
[各種データ]
W M T
f 16.40 23.50 34.00
FNo 2.84 2.84 2.89
ω 54.1 39.9 29.4
Y 20.00 20.00 20.00
TL 163.819 156.784 160.573
BF 26.203 30.775 40.005
[可変間隔データ]
無限遠合焦時 至近距離合焦時
W M T W M T
D0 ∞ ∞ ∞ 336.18 343.22 339.43
β - - - -0.0457 -0.0645 -0.0945
f 16.40 23.50 34.00 - - -
D8 22.206 10.203 2.000 23.643 11.741 3.714
D13 11.561 4.934 5.407 10.123 3.396 3.693
D16 3.000 11.883 19.173 3.000 11.883 19.173
D21 2.000 4.717 8.936 2.000 4.717 8.936
D24 14.997 10.421 1.200 14.997 10.421 1.200
D32 26.203 30.775 40.005 26.203 30.775 40.005
[レンズ群データ]
レンズ群 始面 焦点距離
第1レンズ群 1 -22.37
第2レンズ群 9 76.68
第3レンズ群 14 62.47
第4レンズ群 17 268.42
第5レンズ群 22 -43.69
第6レンズ群 25 37.51
[条件式対応値]
条件式(9) f5/f4 = -0.163
条件式(10) (-f1)/f6 = 0.596
条件式(11) f1/f4 = -0.083
条件式(12) A(T3.5)/A(T4.0) = 1.719
(A(T3.5)=-0.0152,A(T4.0)=-0.0089)
条件式(13) f2/f3 = 1.227
G1 第1レンズ群
G2 第2レンズ群
G3 第3レンズ群
G4 第4レンズ群
G21 第21レンズ群
G22 第22レンズ群
G41 第41レンズ群
G42 第42レンズ群
G5 第5レンズ群
G6 第6レンズ群
VR 防振レンズ群
S 開口絞り
I 像面
1 カメラ(光学機器)
Claims (30)
- 物体側から順に並んだ、負の屈折力を有する第1レンズ群と、第2レンズ群と、第3レンズ群と、負の屈折力を有する第4レンズ群と、正の屈折力を有する第5レンズ群とを有し、
前記第1レンズ群と前記第2レンズ群との間隔と、前記第2レンズ群と前記第3レンズ群との間隔と、前記第3レンズ群と前記第4レンズ群との間隔と、前記第4レンズ群と前記第5レンズ群との間隔を変化させることにより変倍を行い、
前記第4レンズ群は、光軸と垂直方向の成分を持つように移動可能に構成した第42レンズ群と、前記第42レンズ群の物体側に配置された第41レンズ群とを有することを特徴とする変倍光学系。 - 前記第2レンズ群と前記第3レンズ群との少なくとも一方は正の屈折力を有することを特徴とする請求項1に記載の変倍光学系。
- 前記第42レンズ群は、負の屈折力を有することを特徴とする請求項1又は2に記載の変倍光学系。
- 以下の条件式を満足することを特徴とする請求項1~3のいずれか一項に記載の変倍光学系。
0.700 < f42/f4 < 1.700
但し、
f42:前記第42レンズ群の焦点距離、
f4:前記第4レンズ群の焦点距離。 - 以下の条件式を満足することを特徴とする請求項1~4のいずれか一項に記載の変倍光学系。
-0.400 < f4/f41 < 0.500
但し、
f4:前記第4レンズ群の焦点距離、
f41:前記第41レンズ群の焦点距離。 - 以下の条件式を満足することを特徴とする請求項1~5のいずれか一項に記載の変倍光学系。
0.200 < f1/f4 < 0.900
但し、
f1:前記第1レンズ群の焦点距離、
f4:前記第4レンズ群の焦点距離。 - 前記第41レンズ群は、負レンズと、正レンズとを有することを特徴とする請求項1~6のいずれか一項に記載の変倍光学系。
- 前記第42レンズ群は、正レンズと負レンズとの接合レンズからなることを特徴とする請求項1~7のいずれか一項に記載の変倍光学系。
- 前記第42レンズ群の最も像側のレンズ面は、非球面であり、
以下の条件式を満足することを特徴とする請求項1~8のいずれか一項に記載の変倍光学系。
1.100 < A(T3.5)/A(T4.0) < 5.000
但し、
A(T3.5):望遠端状態においてF/3.5のF値に対応する軸上光線が、前記第42レンズ群の最も像側のレンズ面に形成された非球面を通る点での非球面量、
A(T4.0):望遠端状態においてF/4.0のF値に対応する軸上光線が、前記第42レンズ群の最も像側のレンズ面に形成された非球面を通る点での非球面量。
なお、前記非球面量とは、非球面の光軸上での、近似球面に対する非球面のサグ量を光軸に沿って測った量をいう。 - 請求項1~9のいずれか一項に記載の変倍光学系を搭載することを特徴とする光学機器。
- 物体側から順に並んだ、負の屈折力を有する第1レンズ群と、第2レンズ群と、第3レンズ群と、負の屈折力を有する第4レンズ群と、正の屈折力を有する第5レンズ群とを有し、
前記第1レンズ群と前記第2レンズ群との間隔と、前記第2レンズ群と前記第3レンズ群との間隔と、前記第3レンズ群と前記第4レンズ群との間隔と、前記第4レンズ群と前記第5レンズ群との間隔を変化させることにより変倍を行う変倍光学系の製造方法であって、
前記第4レンズ群が、光軸と垂直方向の成分を持つように移動可能に構成した第42レンズ群と、前記第42レンズ群の物体側に配置された第41レンズ群とを有するように、レンズ鏡筒内に各レンズを配置することを特徴とする変倍光学系の製造方法。 - 物体側から順に並んだ、負の屈折力を有する第1レンズ群と、正の屈折力を有する第2レンズ群と、第3レンズ群と、第4レンズ群と、正の屈折力を有する第5レンズ群とを有し、
前記第1レンズ群と前記第2レンズ群との間隔と、前記第2レンズ群と前記第3レンズ群との間隔と、前記第3レンズ群と前記第4レンズ群との間隔と、前記第4レンズ群と前記第5レンズ群との間隔を変化させることにより変倍を行い、
前記第4レンズ群の少なくとも一部を光軸と垂直方向の成分を持つように移動可能に構成し、
以下の条件式を満足することを特徴とする変倍光学系。
-0.400 < (D34T-D34W)/(D23T-D23W) < 1.000
-0.400 < f4/f3 < 0.450
但し、
D34T:望遠端状態における前記第3レンズ群と前記第4レンズ群との空気間隔、
D34W:広角端状態における前記第3レンズ群と前記第4レンズ群との空気間隔、
D23T:望遠端状態における前記第2レンズ群と前記第3レンズ群との空気間隔、
D23W:広角端状態における前記第2レンズ群と前記第3レンズ群との空気間隔、
f4:前記第4レンズ群の焦点距離、
f3:前記第3レンズ群の焦点距離。 - 前記第4レンズ群は、負の屈折力を有することを特徴とする請求項12に記載の変倍光学系。
- 以下の条件式を満足することを特徴とする請求項12又は13に記載の変倍光学系。
0.200 < f1/f4 < 0.900
但し、
f1:前記第1レンズ群の焦点距離。 - 前記第3レンズ群は、負レンズと、正レンズとを有することを特徴とする請求項12~14のいずれか一項に記載の変倍光学系。
- 前記第4レンズ群は、正レンズと負レンズとの接合レンズからなることを特徴とする請求項12~15のいずれか一項に記載の変倍光学系。
- 前記第4レンズ群の最も像側のレンズ面は、非球面であり、
以下の条件式を満足することを特徴とする請求項12~16のいずれか一項に記載の変倍光学系。
1.100 < A(T3.5)/A(T4.0) < 5.000
但し、
A(T3.5):望遠端状態においてF/3.5のF値に対応する軸上光線が、前記第4レンズ群の最も像側のレンズ面に形成された非球面を通る点での非球面量、
A(T4.0):望遠端状態においてF/4.0のF値に対応する軸上光線が、前記第4レンズ群の最も像側のレンズ面に形成された非球面を通る点での非球面量。
なお、前記非球面量とは、非球面の光軸上での、近似球面に対する非球面のサグ量を光軸に沿って測った量をいう。 - 請求項12~17のいずれか一項に記載の変倍光学系を搭載することを特徴とする光学機器。
- 物体側から順に並んだ、負の屈折力を有する第1レンズ群と、正の屈折力を有する第2レンズ群と、第3レンズ群と、第4レンズ群と、正の屈折力を有する第5レンズ群とを有し、
前記第1レンズ群と前記第2レンズ群との間隔と、前記第2レンズ群と前記第3レンズ群との間隔と、前記第3レンズ群と前記第4レンズ群との間隔と、前記第4レンズ群と前記第5レンズ群との間隔を変化させることにより変倍を行う変倍光学系の製造方法であって、
前記第4レンズ群の少なくとも一部を光軸と垂直方向の成分を持つように移動可能に構成し、
以下の条件式を満足するように、
レンズ鏡筒内に各レンズを配置することを特徴とする変倍光学系の製造方法。
-0.400 < (D34T-D34W)/(D23T-D23W) < 1.000
-0.400 < f4/f3 < 0.450
但し、
D34T:望遠端状態における前記第3レンズ群と前記第4レンズ群との空気間隔、
D34W:広角端状態における前記第3レンズ群と前記第4レンズ群との空気間隔、
D23T:望遠端状態における前記第2レンズ群と前記第3レンズ群との空気間隔、
D23W:広角端状態における前記第2レンズ群と前記第3レンズ群との空気間隔、
f4:前記第4レンズ群の焦点距離、
f3:前記第3レンズ群の焦点距離。 - 物体側から順に並んだ、負の屈折力を有する第1レンズ群と、正の屈折力を有する第2レンズ群と、正の屈折力を有する第3レンズ群と、第4レンズ群と、負の屈折力を有する第5レンズ群と、正の屈折力を有する第6レンズ群とを有し、
前記第1レンズ群と前記第2レンズ群との間隔と、前記第2レンズ群と前記第3レンズ群との間隔と、前記第3レンズ群と前記第4レンズ群との間隔と、前記第4レンズ群と前記第5レンズ群との間隔と、前記第5レンズ群と前記第6レンズ群との間隔を変化させることにより変倍を行い、
前記第1レンズ群~前記第6レンズ群のうち、いずれかのレンズ群の少なくとも一部を光軸と垂直方向の成分を持つように移動可能に構成することを特徴とする変倍光学系。 - 前記第5レンズ群の少なくとも一部を像ブレを補正するために光軸と垂直方向の成分を持つように移動可能に構成することを特徴とする請求項20に記載の変倍光学系。
- 以下の条件式を満足することを特徴とする請求項20又は21に記載の変倍光学系。
-0.500 < f5/f4 < 0.500
但し、
f5:前記第5レンズ群の焦点距離、
f4:前記第4レンズ群の焦点距離。 - 以下の条件式を満足することを特徴とする請求項20~22のいずれか一項に記載の変倍光学系。
0.300 < (-f1)/f6 < 0.900
但し、
f1:前記第1レンズ群の焦点距離、
f6:前記第6レンズ群の焦点距離。 - 以下の条件式を満足することを特徴とする請求項20~23のいずれか一項に記載の変倍光学系。
-0.400 < f1/f4 < 0.400
但し、
f1:前記第1レンズ群の焦点距離、
f4:前記第4レンズ群の焦点距離。 - 前記第4レンズ群は、負レンズと、正レンズとを有することを特徴とする請求項20~24のいずれか一項に記載の変倍光学系。
- 前記第5レンズ群は、正レンズと負レンズとの接合レンズからなることを特徴とする請求項20~25のいずれか一項に記載の変倍光学系。
- 前記第4レンズ群の最も像側のレンズ面は、非球面であり、
以下の条件式を満足することを特徴とする請求項20~26のいずれか一項に記載の変倍光学系。
1.100 < A(T3.5)/A(T4.0) < 5.000
但し、
A(T3.5):望遠端状態においてF/3.5のF値に対応する軸上光線が、前記第5レンズ群の最も像側のレンズ面に形成された非球面を通る点での非球面量、
A(T4.0):望遠端状態においてF/4.0のF値に対応する軸上光線が、前記第5レンズ群の最も像側のレンズ面に形成された非球面を通る点での非球面量。
なお、前記非球面量とは、非球面の光軸上での、近似球面に対する非球面のサグ量を光軸に沿って測った量をいう。 - 以下の条件式を満足することを特徴とする請求項20~27のいずれか一項に記載の変倍光学系。
0.500 < f2/f3 < 2.000
但し、
f2:前記第2レンズ群の焦点距離、
f3:前記第3レンズ群の焦点距離。 - 請求項20~28のいずれか一項に記載の変倍光学系を搭載することを特徴とする光学機器。
- 物体側から順に並んだ、負の屈折力を有する第1レンズ群と、正の屈折力を有する第2レンズ群と、正の屈折力を有する第3レンズ群と、第4レンズ群と、負の屈折力を有する第5レンズ群と、正の屈折力を有する第6レンズ群とを有し、前記第1レンズ群と前記第2レンズ群との間隔と、前記第2レンズ群と前記第3レンズ群との間隔と、前記第3レンズ群と前記第4レンズ群との間隔と、前記第4レンズ群と前記第5レンズ群との間隔と、前記第5レンズ群と前記第6レンズ群との間隔を変化させることにより変倍を行う変倍光学系の製造方法であって、
前記第1レンズ群~前記第6レンズ群のうち、いずれかのレンズ群の少なくとも一部が光軸と垂直方向の成分を持つように移動可能な構成となるように、レンズ鏡筒内に各レンズを配置することを特徴とする変倍光学系の製造方法。
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| EP16743569.2A EP3252520B1 (en) | 2015-01-30 | 2016-01-29 | Variable magnification optical system, optical instrument and method of manufacturing variable magnification optical system |
| JP2016572206A JPWO2016121966A1 (ja) | 2015-01-30 | 2016-01-29 | 変倍光学系、光学機器及び変倍光学系の製造方法 |
| CN201680015607.4A CN107430261B (zh) | 2015-01-30 | 2016-01-29 | 变倍光学系统以及光学设备 |
| US15/545,705 US10678034B2 (en) | 2015-01-30 | 2016-01-29 | Variable magnification optical system, optical apparatus, and method for manufacturing variable magnification optical system |
| US16/885,722 US11520127B2 (en) | 2015-01-30 | 2020-05-28 | Variable magnification optical system, optical apparatus, and method for manufacturing variable magnification optical system |
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| US16/885,722 Division US11520127B2 (en) | 2015-01-30 | 2020-05-28 | Variable magnification optical system, optical apparatus, and method for manufacturing variable magnification optical system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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Also Published As
| Publication number | Publication date |
|---|---|
| US11520127B2 (en) | 2022-12-06 |
| JP6747492B2 (ja) | 2020-08-26 |
| CN107430261B (zh) | 2020-07-17 |
| US20180196241A1 (en) | 2018-07-12 |
| EP3252520B1 (en) | 2025-08-20 |
| US10678034B2 (en) | 2020-06-09 |
| EP3252520A1 (en) | 2017-12-06 |
| JP2019056916A (ja) | 2019-04-11 |
| EP3252520A4 (en) | 2019-02-27 |
| US20200292799A1 (en) | 2020-09-17 |
| JPWO2016121966A1 (ja) | 2017-10-19 |
| CN107430261A (zh) | 2017-12-01 |
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