JP2019200254A - Zoom lens and imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a zoom lens advantageous in terms of small size, wide angle, high zoom ratio, and high optical performance over the entire zoom range. In order from the object side to the image side, a positive first lens unit L1 that does not move during zooming, and a second lens unit A1 that has the largest amount of movement toward the image side during zooming from the wide-angle end to the telephoto end are included. The second lens unit L2, which is composed of 1 or 2 lens units, and which moves during zooming, and the third lens unit A2, which has the largest amount of movement toward the object side in zooming from the wide-angle end to the telephoto end, among the positive lens units. A third lens unit L3 including one or two lens units, a negative fourth lens unit L4 that moves during zooming and focusing, and a positive lens unit located on the image side at the telephoto end with respect to the wide-angle end. The fifth lens unit L5 includes a fifth lens unit, and the distance between any adjacent lens units changes during zooming. The fifth lens unit L5 includes positive and negative lenses, and moves from the wide-angle end to the telephoto end of the second and third lens units. Of the third lens unit A4 at the wide-angle end to the telephoto end, the fourth lens unit L4 and the fifth lens unit L5 at the wide-angle end and the telephoto end at infinity focusing. Properly set the interval. [Selection diagram] Figure 1

Description

  The present invention relates to a zoom lens and an imaging apparatus.

  In recent years, downsizing of image pickup apparatuses such as digital still cameras and video cameras using solid-state image pickup devices has progressed. An optical system used in the imaging apparatus is required to have high brightness, high zoom ratio, and high optical performance over the entire zoom range. In addition, because of high image quality and a shallow depth of field, it is desired to increase the size of the solid-state imaging device. The zoom lens is required to be small in size while corresponding to the increase in size of the solid-state imaging device.

  2. Description of the Related Art Conventionally, a five-group zoom lens including first to fifth lens groups having positive, negative, positive, negative, and positive refractive powers in order from the object side to the image side is known. Further, as zoom lenses of the 5-group zoom lens system, Patent Document 1 and Patent Document 2 have first, negative, positive, positive, negative, and positive refractive powers in order from the object side to the image side, respectively. In addition, a configuration in which the sixth to sixth lens groups are arranged and the second to fifth lens groups move for zooming is disclosed.

JP 2016-139125 A JP 2006-178244 A

  In the configuration of Patent Document 1, when the zoom ratio is increased, the variation in the chromatic aberration of magnification accompanying zooming becomes large, and it is difficult to obtain high optical performance in the entire zoom range. In the configuration of Patent Document 2, for example, when a high zoom ratio exceeding 5 is performed, the total lens length becomes long, and it is difficult to reduce the size and weight. Moreover, it is more difficult to obtain an advantage in terms of compactness, wide angle, high zoom ratio, and high optical performance over the entire zoom range in such a zoom lens system described above.

  An object of the present invention is to provide a zoom lens that is advantageous in terms of, for example, small size, wide angle, high zoom ratio, and high optical performance over the entire zoom range.

In order to achieve the above object, the zoom lens of the present invention includes, in order from the object side to the image side, a first lens unit having a positive refractive power that does not move for zooming, and a change from the wide-angle end to the telephoto end. A second lens unit including a second refractive power second A lens unit having the largest amount of movement from the object side to the image side for magnification, and one or two lens units, and a wide-angle end to a telephoto end A third lens group having a positive refracting power and a third lens group having one or two lens groups with the largest amount of movement from the image side to the object side for zooming, and zooming And a fourth lens group with negative refractive power that moves for focusing, and a fifth lens group with positive refractive power that moves from the object side to the image side for zooming from the wide-angle end to the telephoto end. The distance between any two adjacent lens groups changes due to zooming, and the fifth lens group has a positive lens And a negative lens, and the amount of movement of the second A lens group from the wide-angle end to the telephoto end is m2, and the amount of movement of the third A lens group from the wide-angle end to the telephoto end is m3. The distance between the fourth lens group and the fifth lens group at the wide-angle end and the fourth lens group at the wide-angle end is d45w, and the fourth focus at the infinite position and the fourth at the telephoto end. The distance between the lens group and the fifth lens group is d45t,
-8.0 <m2 / m3 <-1.5
0.9 <d45t / d45w <10.0
A zoom lens satisfying the following conditional expression: However, the movement amount is positive when the position of the second A lens group at the telephoto end is closer to the image side than the position of the second A lens group at the wide angle end, and the second A lens at the wide angle end is positive. The difference between the position of the group and the position of the second A lens group at the telephoto end is defined as the difference.

  According to the present invention, for example, it is possible to provide a zoom lens that is advantageous in terms of small size, a high zoom ratio, and high optical performance over the entire zoom range.

Lens cross-sectional view when focusing on infinity at the wide-angle end in Numerical Example 1 Aberration diagram when focusing on infinity at the wide-angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 1. Lens cross-sectional view when focusing on infinity at the wide angle end in Numerical Example 2 Aberration diagram when focusing on infinity at the wide-angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 2. Lens cross-sectional view when focusing on infinity at the wide-angle end in Numerical Example 3 Aberration diagram at the time of focusing on infinity at the wide angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 3. Lens sectional view at the time of focusing on infinity at the wide angle end in Numerical Example 4 Aberration diagram at the time of focusing on infinity at the wide-angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 4. Lens sectional view at the time of focusing on infinity at the wide angle end in Numerical Example 5 Aberration diagram when focusing on infinity at the wide-angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 5 Lens sectional view at the time of focusing on infinity at the wide angle end in Numerical Example 6 Aberration diagram when focusing on infinity at the wide angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 6 Schematic diagram of essential parts of a video camera (imaging device) equipped with the zoom lens of the present invention

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The zoom lens according to the present invention includes, in order from the object side, a first lens unit having a positive refractive power that does not move for zooming, and an object that moves for zooming and zooms from the wide-angle end to the telephoto end. Telephoto from the wide-angle end to the second lens group including the second A lens group that has the largest amount of movement from the side to the image side, including one or two lens groups, and a lens group having positive refractive power A third lens group including the third A lens group that has the largest amount of movement from the image side to the object side upon zooming to the end, and a third lens group composed of one or two lens groups, for zooming and focusing A fourth lens unit having a negative refractive power that moves and a fifth lens unit having a positive refractive power located on the image side at the telephoto end with respect to the wide angle end.

  FIG. 1 is a lens cross-sectional view at the time of focusing on an object at infinity at the wide angle end according to Numerical Embodiment 1 as Embodiment 1 of the present invention. 2A, 2B, and 2C are longitudinal aberration diagrams when focusing on an object at infinity at the wide-angle end, the focal length of 57 mm, and the telephoto end of Numerical Example 1. FIG.

  The zoom lens of each embodiment is a photographing optical system used in an imaging apparatus. In the lens cross-sectional view, the left side is the subject side (object side) and the right side is the image side. In the cross-sectional view, L1 is a positive first lens group, L2 is a second lens group, L3 is a third lens group, L4 is a negative fourth lens group, and L5 is a positive fifth lens group. SP is an aperture stop, which is located between the second lens unit L2 and the third lens unit L3. L2A is the second A lens group that has the largest amount of movement from the object side to the image side upon zooming from the wide-angle end to the telephoto end, and L3A is a lens group having positive refractive power from the wide-angle end to the telephoto end. This is the 3A lens group that has the largest amount of movement from the image side to the object side during magnification. In each embodiment, the aperture stop SP is not moved during zooming, and the imaging apparatus is simplified. P is an optical block corresponding to an optical filter, a face plate, or the like. I is an image plane. When used as a photographing optical system for a digital still camera or a video camera, the imaging surface of a solid-state imaging device such as a CCD sensor or a CMOS sensor corresponds to a film surface when a camera for a silver salt film is used. To do.

  In the aberration diagrams, in spherical aberration, d is d-line and g is g-line. In the astigmatism diagram, ΔM and ΔS are a meridional image surface and a sagittal image surface, respectively. Lateral chromatic aberration is represented by the g-line. Fno is an F number. ω is a half angle of view (degree). In the following embodiments, the wide-angle end and the telephoto end refer to zoom positions when the second lens group is positioned at both ends of a range in which the second lens unit can be moved in the optical axis direction due to the mechanism.

  In each embodiment, during zooming from the wide-angle end to the telephoto end, the second A lens unit L2A moves monotonously to the image side. Further, the third A lens unit L3A performs zooming so that it is positioned closer to the object side at the telephoto end than at the wide-angle end. Further, the fourth lens unit L4 is moved non-linearly to the object side to correct the image plane variation due to zooming. In each embodiment, a rear focus type in which focusing (focusing) is performed by moving the fourth lens unit L4 on the optical axis is employed. In each embodiment, the fourth lens unit L4 is extended to the image side to focus from infinity to a short distance at the telephoto end.

  In each embodiment, at the time of shooting, the whole or a part of the third lens unit L3 is moved in a direction having a component perpendicular to the optical axis to cause blurring of a shot image that occurs when the zoom lens vibrates. May be corrected. That is, image blur correction may be performed.

  The zoom lens of each embodiment sequentially moves from the object side to the image side with a first lens unit having a positive refractive power that does not move for zooming, and for zooming, from the wide-angle end to the telephoto end. Among the second lens group including the second A lens group having the largest amount of movement from the object side to the image side at the time of zooming and including one or two lens groups, and a lens group having a positive refractive power A third lens group including one or two lens groups including the third A lens group having the largest amount of movement from the image side to the object side upon zooming from the wide-angle end to the telephoto end; A fourth lens unit having a negative refractive power that moves due to focusing; and a fifth lens unit having a positive refractive power that is positioned on the image side at the telephoto end with respect to the wide-angle end.

The interval between any two adjacent lens groups is configured to change due to zooming. The fifth lens group includes a positive lens and a negative lens. The amount of movement of the second A lens group in zooming from the wide-angle end to the telephoto end is m2, and the amount of movement of the third A lens group in zooming from the wide-angle end to the telephoto end is m3. The distance between the fourth lens group and the fifth lens group at the wide-angle end in the closed state is d45w, and the distance between the fourth lens group and the fifth lens group at the telephoto end in the state focused at infinity. d45t,
−8.0 <m2 / m3 <−1.5 (1)
0.9 <d45t / d45w <10 (2)
The following conditional expression is satisfied.

  Here, the sign of the moving amount of the lens unit that moves during zooming is negative when the lens unit is located on the object side at the telephoto end and positive when it is located on the image side as compared to the wide-angle end. The position differences m2 and m3 correspond to the amount of movement when moving monotonously. When reciprocating, it does not include the reciprocal distance, and is the difference between the position at the wide-angle end and the position in the optical axis direction at the telephoto end.

  The zoom lens of the present invention is configured as described above, and the entire system is small and suitable for ensuring a high zoom ratio. If the first lens unit L1 is decentered, the curvature of field is not rotationally symmetric at the telephoto end, and for example, the object distance to be focused on the left and right of the screen is different, which is not preferable. Therefore, the first lens unit L1 is not moved during zooming. The zooming is performed by moving the second A lens group L2A, the third A lens group L3A, and the fifth lens group L5. The effective diameter of the front lens is also reduced by moving the third lens unit L3A to shorten the entrance pupil position at the intermediate zoom position. The fourth lens unit L4 is moved for correction of image plane variation accompanying focusing and for focusing. The above conditional expressions (1) and (2) are satisfied.

Next, the technical meaning of conditional expressions (1) and (2) will be described.
Conditional expression (1) indicates that the amount of movement of the 2A lens group during zooming from the wide-angle end to the telephoto end and the direction of movement during zooming from the wide-angle end to the telephoto end are those in the lens group whose direction is opposite to that of the 2A lens group. The relationship of the movement amount of the 3A lens group that is the lens group having the largest movement amount is defined. If the upper limit of conditional expression (1) is exceeded, the amount of movement of the second lens group becomes large, the distance from the first lens group to the aperture stop becomes long, and the first lens group becomes large, making it difficult to reduce the size. It becomes. Conversely, if the lower limit of conditional expression (1) is exceeded, it is necessary to earn a large zoom ratio other than the 2A lens group that is the main variable magnification group, and therefore the amount of movement in zooming other than the 2A lens group increases. The total lens length tends to be long, making it difficult to reduce the size.

  Conditional expression (2) indicates that the distance between the fourth lens group and the fifth lens group in the state of being in focus at the wide-angle end and infinity, and the fourth lens group in the state of being in focus at the telephoto end and infinity. And the interval between the fifth lens groups. The fourth lens group is a focus group, and moves from the object side to the image side when the near subject is in focus with respect to the infinite subject. The amount of movement of the fourth lens group associated with focusing is greater at the telephoto end than at the wide angle end. When the distance between the fourth lens group and the fifth lens group is wider at the telephoto end than at the wide-angle end, the distance can be used for focusing, so that the entire lens length can be easily shortened.

  If the upper limit of conditional expression (2) is exceeded, the distance between the fourth lens group and the fifth lens group at the telephoto end becomes too large, and it becomes difficult to shorten the total lens length. On the contrary, if the lower limit of conditional expression (2) is exceeded, the distance at which the fourth lens unit can move by focusing at the telephoto end decreases, and it becomes difficult to shorten the closest focusable shooting distance.

More preferably, conditional expression (1) and conditional expression (2) are set as follows.
-7.0 <m2 / m3 <-1.8 (1a)
1.0 <d45t / d45w <8.0 (2a)

As a further aspect of the zoom lens according to the present invention, it is preferable that the following conditional expression is satisfied.
−0.95 <f4 / f5 <−0.45 (3)
However, the focal length of the fourth lens group is f4, and the focal length of the fifth lens group is f5.

Conditional expression (3) defines the ratio of the focal length of the fourth lens group to the focal length of the fifth lens group.
If the upper limit of conditional expression (3) is exceeded, image plane position fluctuations when the fourth lens unit moves during zooming and focusing become too large, making it difficult to perform image plane correction with high accuracy. Conversely, if the lower limit of conditional expression (3) is exceeded, the amount of movement of the fourth lens group will increase during zooming and focusing, and the total lens length will increase.

More preferably, conditional expression (3) should be set as follows.
−0.90 <f4 / f5 <−0.50 (3a)

As a further aspect of the zoom lens according to the present invention, it is preferable that the following conditional expression is satisfied.
−6.50 <f1 / f2w <−4.00 (4)
However, the focal length of the first lens group is set to f1, and the combined focal length of the front lens group in a state in which it is focused at the wide-angle end and infinity is set to f2w.

Conditional expression (4) defines the ratio between the focal length of the first lens unit and the combined focal length of the front lens unit in a state where the focal point is at the wide-angle end and infinity.
Exceeding the upper limit of conditional expression (4) makes it difficult to correct spherical aberration and coma at the telephoto zoom position. Conversely, if the lower limit of conditional expression (4) is exceeded, it will be difficult to correct astigmatism at the wide-angle zoom position.

More preferably, conditional expression (4) should be set as follows.
−6.00 <f1 / f2w <−4.50 (4a)

As a further aspect of the zoom lens according to the present invention, it is preferable that the following conditional expression is satisfied.
20 <νd5p−νd5n <60 (5)
However, the average Abbe number of the positive lens in the fifth lens group is νd5p, and the average Abbe number of the negative lens in the fifth lens group is νd5n.

Conditional expression (5) defines the ratio between the average Abbe number νd5p of the positive lens in the fifth lens group and the average Abd number νd5n of the negative lens in the fifth lens group.
When the upper limit of conditional expression (5) is exceeded, the effect of correcting the chromatic aberration of magnification when the fifth lens group moves by zooming becomes excessive, and the correction of the chromatic aberration of magnification on the telephoto side becomes excessive. On the other hand, if the lower limit of conditional expression (5) is exceeded, the effect of correcting the chromatic aberration of magnification when the fifth lens group is moved by zooming will be weak, and it will be difficult to satisfactorily correct the variation of chromatic aberration of magnification in the entire zoom range. It becomes.

More preferably, conditional expression (5) should be set as follows.
25 <νd5p−νd5n <55 (5a)

  As a further aspect of the zoom lens according to the present invention, it is preferable that an aperture stop is disposed between the second lens group and the third lens group. It is arranged between the second lens group and the third lens group that move by zooming, and the distance from the first lens group to the aperture stop is controlled by appropriately allocating the respective movement amounts, so that the first lens group is effective. The diameter can be easily reduced.

  As a further aspect of the zoom lens of the present invention, it is preferable that the fifth lens group has at least one aspheric surface. Since the light beam passing through the fifth lens group forms an image on the periphery of the sensor and passes through a position away from the optical axis, it is possible to effectively correct the curvature of field.

As a further aspect of the zoom lens according to the present invention, it is preferable that the following conditional expression is satisfied.
1.05 <β5t / β5w <1.70 (6)

Conditional expression (6) satisfies the lateral magnification β5w of the fifth lens group focused on the wide-angle end and infinity, and the lateral magnification of the fifth lens group focused on the telephoto end and infinity. The ratio of β5t is specified.
When the upper limit of conditional expression (6) is exceeded, the amount of movement of the fifth lens unit becomes too large during zooming, and the lateral chromatic aberration and field curvature fluctuations due to zooming become large. On the contrary, if the lower limit of conditional expression (6) is exceeded, the zooming effect by the fifth lens group cannot be obtained, so that the amount of movement of other lens groups becomes large to obtain a predetermined zooming ratio, and the total lens length becomes long. turn into.

More preferably, conditional expression (6) should be set as follows.
1.15 <β5t / β5w <1.63 (6a)

  As a further aspect of the zoom lens of the present invention, the first lens group includes three or more lenses. In order to reduce the effective diameter of the first lens group, it is effective to increase the refractive index of the material of the positive lens of the lens closest to the image among the positive lenses constituting the first lens group. However, a glass material with a high refractive index tends to have a large Abbe number, and therefore, when a material with a high refractive index is used for a positive lens, it is particularly difficult to correct axial chromatic aberration at the telephoto end. Therefore, by adding a positive lens and using a material with small dispersion, it is possible to reduce the effective diameter of the first lens group while satisfactorily correcting the axial chromatic aberration at the telephoto end. In addition, since the effect of relaxing the curvature of each surface of the lenses constituting the first lens group can be obtained, coma and spherical aberration can be favorably corrected at the zoom position on the telephoto side.

As a further aspect of the zoom lens according to the present invention, it is preferable that the following conditional expression is satisfied.
10 <ft / fw (7)
However, let fw be the focal length when the lens is in focus at the wide angle end and infinity, and let ft be the focal length when the lens is focused at the telephoto end and infinity. Conditional expression (7) defines the zoom ratio.

  When the conditional expression (7) is not satisfied, the number of means necessary for obtaining the same effect as that of the present invention increases, which is not preferable as a range to which the present invention is applied.

More preferably, conditional expression (7) should be set as follows.
15 <ft / fw (7a)

  Hereinafter, a specific configuration of the zoom lens according to the present invention will be described with reference to characteristics of lens configurations of Numerical Examples 1 to 6 corresponding to Embodiments 1 to 6.

  FIG. 1 is a lens cross-sectional view of Example 1 (Numerical Example 1) of the present invention when focused at infinity at the wide-angle end. In FIG. 2, (a) is a wide angle end, (b) is a focal length of 57 mm, and (c) is a longitudinal aberration diagram when focusing at infinity at the telephoto end.

  As shown in FIG. 1, the zoom lens includes, in order from the object side, a positive first lens unit L1, a negative second lens unit L2, a positive third lens unit L3, a negative fourth lens unit L4, and a positive lens unit. A fifth lens unit L5 is included. SP is an aperture stop, which is located between the second lens unit L2 and the third lens unit L3.

  In this embodiment, the second lens unit L2 is composed of one lens unit, and moves to the image side upon zooming from the wide-angle end to the telephoto end. In the present embodiment, the second lens unit L2 is the second A lens unit L2A that has the largest amount of movement from the object side to the image side upon zooming from the wide-angle end to the telephoto end.

  In the present embodiment, the third lens unit L3 includes one lens unit. In the present embodiment, the third lens unit L3 has the largest amount of movement from the image side to the object side during zooming from the wide-angle end to the telephoto end among the lens units having positive refractive power. L3A.

  The fourth lens unit L4 is non-linearly moved to the object side to correct image plane variation accompanying zooming. Further, by focusing the fourth lens unit L4 toward the image side, focusing is performed from infinity to a short distance at the telephoto end. Further, the fifth lens unit moves so as to be positioned on the image side at the telephoto end with respect to the wide angle end during zooming. SP is an aperture stop, P is an optical block corresponding to an optical filter, a face plate, etc., and I is an image plane.

  The first lens unit L1 in the present embodiment will be described. The first lens unit L1 corresponds to the first surface to the seventh surface. The first lens unit L1 includes a cemented lens of a meniscus concave lens having a convex surface on the object side and a biconvex lens, a meniscus convex lens having a convex surface on the object side, and a meniscus convex lens having a convex surface on the object side.

The second lens unit L2 corresponds to the eighth to thirteenth surfaces and includes a biconcave lens, a biconcave lens, and a biconvex lens. Further, the tenth and eleventh surfaces are aspherical, and mainly correct the field curvature due to zooming and fluctuations in coma aberration in the peripheral image height.
The third lens unit L3 includes one lens unit (third A lens unit L3A). The third lens unit L3 corresponds to the fifteenth to twenty-third surfaces, and includes a biconvex lens, a convex meniscus concave lens on the object side, a biconvex lens, and a cemented lens of a convex meniscus concave lens on the object side and a biconvex lens. The fifteenth, sixteenth, and twenty-third surfaces are aspherical, and mainly correct variations in spherical aberration caused by zooming. The cemented lens corresponding to the 21st surface to the 23rd surface in the third lens group L3 may be a vibration proof group that corrects image blur due to camera shake or the like by moving in a direction orthogonal to the optical axis. The aspheric surface of the 23rd surface is effective in suppressing fluctuations in coma during vibration isolation.

  The fourth lens unit L4 corresponds to the 24th to 26th surfaces and includes a cemented lens of a biconvex lens and a biconcave lens. The fourth lens unit L4 is a focusing unit that moves to the image side when focusing from the infinity side to the close side.

  The fifth lens unit L5 corresponds to the 27th to 31st surfaces and includes a cemented lens and a biconvex lens of a meniscus convex lens having a convex surface on the image side and a meniscus concave lens having a convex surface on the image side. The thirtieth surface is an aspheric surface, and mainly corrects variations in curvature of field due to zooming.

Numerical Example 1 corresponding to Example 1 will be described. In all numerical examples, not limited to Numerical Example 1, i indicates the order of surfaces (optical surfaces) from the object side, ri is the radius of curvature of the i-th surface from the object side, and di is the i-th surface from the object side. The interval (on the optical axis) between the i th surface and the (i + 1) th surface is shown. Ndi and νdi represent the refractive index and Abbe number of the medium (optical member) between the i-th surface and the (i + 1) -th surface, and BF represents the back focus in terms of air. The aspherical shape is the X axis in the optical axis direction, the H axis in the direction perpendicular to the optical axis, the light traveling direction is positive, R is the paraxial radius of curvature, k is the cone constant, A4, A6, A8, A10, A12. When each aspheric coefficient is used, it is expressed by the following equation. “E-Z” means “× 10 ^−Z ”. The half angle of view is a value obtained by ray tracing.

  Table 1 shows values corresponding to the conditional expressions of this example. The present embodiment satisfies the expressions (1) to (7), and achieves a zoom lens having a wide angle and a high zoom ratio and high optical performance over the entire zoom range while reducing the size of the entire system. . In the zoom lens of the present invention, it is essential that the expressions (1) to (2) are satisfied, but the expressions (3) to (7) may not be satisfied. However, if at least one of the expressions (3) to (7) is satisfied, a better effect can be obtained. The same applies to the other embodiments.

  FIG. 13 is a schematic diagram of an image pickup apparatus (television camera system) using the zoom lens of each embodiment as a photographing optical system. In FIG. 13, reference numeral 101 denotes a zoom lens according to any one of Examples 1 to 6. Reference numeral 124 denotes a camera. The zoom lens 101 can be attached to and detached from the camera 124. An imaging apparatus 125 is configured by attaching the zoom lens 101 to the camera 124.

  The zoom lens 101 includes a first lens group F and a zoom unit LZ. The zoom unit LZ includes a focusing lens group. The zooming unit LZ moves on the optical axis in order to correct the image plane variation accompanying zooming, and the second lens group, the third lens group, and the fifth lens group that move on the optical axis for zooming. A fourth lens group is included. The fourth lens group also serves as a focusing group that moves to the image side when focusing from the infinity side to the close side. SP is an aperture stop. Reference numeral 115 denotes a drive mechanism such as a helicoid or a cam that drives the zoom unit LZ in the optical axis direction. Reference numerals 117 and 118 denote motors (drive means) for electrically driving the drive mechanism 115 and the aperture stop SP. Reference numerals 120 and 121 denote detectors such as an encoder, a potentiometer, or a photosensor for detecting the position of the zooming portion LZ on the optical axis and the aperture diameter of the aperture stop SP.

  In the camera 124, 109 is a glass block corresponding to an optical filter or color separation optical system in the camera 124, and 110 is a solid-state imaging device (photoelectric conversion) such as a CCD sensor or a CMOS sensor that receives an object image formed by the zoom lens 101. Element). When an electronic image sensor is used, the output image can be further improved in image quality by electronically correcting aberrations. Reference numerals 111 and 122 denote CPUs that control various types of driving of the camera 124 and the zoom lens 101.

  As described above, by applying the zoom lens of the present invention to a digital video camera, a television camera, or a cinema camera, an imaging apparatus having high optical performance is realized.

  FIG. 3 is a lens cross-sectional view of a zoom lens that is Embodiment 2 (Numerical Embodiment 2) of the present invention when focused at infinity at the wide angle end. 4A is a longitudinal aberration diagram at the wide-angle end, FIG. 4B is a focal length of 63 mm, and FIG. 4C is a longitudinal aberration diagram at the telephoto end. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 3, the first lens unit L1 having a positive refractive power is provided in order from the object side. The second lens unit L2 includes one lens unit (second A lens unit L2A). The second lens unit L2 has a negative refractive power and moves to the image side upon zooming from the wide-angle end to the telephoto end. In the present embodiment, the second lens unit L2 is the second A lens unit L2A that has the largest amount of movement from the object side to the image side upon zooming from the wide-angle end to the telephoto end. The third lens unit L3 includes one lens unit (third A lens unit L3A). The third lens unit L3 has a positive refractive power and moves on the optical axis upon zooming from the wide-angle end to the telephoto end. In the present embodiment, the third lens unit L3 has the largest amount of movement from the image side to the object side during zooming from the wide-angle end to the telephoto end among the lens units having positive refractive power. L3A.

  Further, a negative fourth lens unit L4 that moves non-linearly on the optical axis in conjunction with the movement of the second lens unit L2 and the third lens unit L3 and corrects the image plane variation due to zooming is provided. ing. Further, the fourth lens unit L4 moves to the image side during focusing from the infinity side to the close side. The fifth lens unit L5 moves so as to be positioned on the image side at the telephoto end with respect to the wide angle end during zooming. SP is an aperture stop, and I is an image plane.

  The first lens unit L1 in the present embodiment will be described. The first lens unit L1 corresponds to the first surface to the seventh surface. The first lens unit L1 includes a cemented lens of a meniscus concave lens having a convex surface on the object side and a biconvex lens, a meniscus convex lens having a convex surface on the object side, and a meniscus convex lens having a convex surface on the object side.

  The second lens unit L2 corresponds to the eighth to thirteenth surfaces and includes a biconcave lens, a biconcave lens, and a biconvex lens. Further, the tenth and eleventh surfaces are aspherical, and mainly correct the field curvature due to zooming and fluctuations in coma aberration in the peripheral image height.

  The third lens unit L3 corresponds to the fifteenth to twenty-third surfaces, a biconvex lens, a convex meniscus concave lens on the object side, a convex meniscus convex lens on the object side, and a cemented lens of a convex meniscus concave lens and biconvex lens on the object side Consists of. The fifteenth, sixteenth, and twenty-third surfaces are aspherical, and mainly correct variations in spherical aberration caused by zooming. The cemented lens corresponding to the 21st surface to the 23rd surface in the third lens group L3 may be a vibration proof group that corrects image blur due to camera shake or the like by moving in a direction orthogonal to the optical axis. The aspheric surface of the 23rd surface is effective in suppressing fluctuations in coma during vibration isolation.

  The fourth lens unit L4 corresponds to the 24th to 26th surfaces and includes a cemented lens of a biconvex lens and a biconcave lens. The fourth lens unit L4 is a focusing unit that moves to the image side when focusing from the infinity side to the close side.

  The fifth lens unit L5 corresponds to the 27th to 31st surfaces and includes a cemented lens of a meniscus concave lens having a convex surface on the image side and a meniscus convex lens having a convex surface on the image side, and a biconvex lens. The 30th and 31st surfaces are aspherical surfaces, and mainly correct the variation in field curvature due to zooming.

  Table 1 shows values corresponding to the conditional expressions of this example. The present embodiment satisfies the expressions (1) to (7), and achieves a zoom lens having a wide angle and a high zoom ratio and high optical performance over the entire zoom range while reducing the size of the entire system. .

  FIG. 5 is a lens cross-sectional view of a zoom lens that is Embodiment 3 (Numerical Embodiment 3) of the present invention when focused at infinity at the wide-angle end. 6A is a longitudinal aberration diagram at the wide-angle end, FIG. 6B is a focal length of 60 mm, and FIG. 6C is a longitudinal aberration diagram at the telephoto end. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 5, the first lens unit L1 having a positive refractive power is provided in order from the object side. The second lens unit L2 includes one lens unit (second A lens unit L2A). The second lens unit L2 has a negative refractive power and moves to the image side upon zooming from the wide-angle end to the telephoto end. In the present embodiment, the second lens unit L2 is the second A lens unit L2A that has the largest amount of movement from the object side to the image side upon zooming from the wide-angle end to the telephoto end. The third lens unit L3 includes a thirty-first lens unit L31 having a positive refractive power that moves on the optical axis for zooming when zooming from the wide-angle end to the telephoto end, and an optical axis for zooming. It has a 32nd lens unit L32 with positive refractive power that moves. In the present embodiment, the third lens unit L31 has the largest amount of movement from the image side to the object side during zooming from the wide-angle end to the telephoto end among the lens units having positive refractive power. It is.

  Further, a negative fourth lens unit L4 that moves non-linearly on the optical axis in conjunction with the movement of the second lens unit L2 and the third lens unit L3 and corrects the image plane variation due to zooming is provided. ing. Further, the fourth lens unit L4 moves to the image side during focusing from the infinity side to the close side. Further, the fifth lens unit moves so as to be positioned on the image side at the telephoto end with respect to the wide-angle end at the time of zooming at L5. SP is an aperture stop, P is a prism or filter, and I is an image plane.

  The first lens unit L1 in the present embodiment will be described. The first lens unit L1 corresponds to the first surface to the seventh surface. The first lens unit L1 includes a cemented lens of a convex meniscus concave lens and a biconvex lens on the object side, a convex meniscus convex lens on the object side, and a convex meniscus convex lens on the object side.

  The second lens unit L2 corresponds to the eighth to thirteenth surfaces and includes a biconcave lens, a biconcave lens, and a biconvex lens. In addition, the ninth surface has an aspherical shape, and mainly corrects the curvature of field caused by zooming and the fluctuation of coma in the peripheral image height.

  The thirty-first lens unit L31 corresponds to the fifteenth to twentieth surfaces and includes a biconvex lens, a convex meniscus concave lens on the object side, and a biconvex lens. The fifteenth surface and the sixteenth surface are aspherical and mainly correct the variation of spherical aberration caused by zooming. The thirty-second lens unit L32 corresponds to the twenty-first surface to the twenty-third surface, and includes a cemented lens of a biconvex lens and a meniscus concave lens having a convex surface on the image side. The thirty-second lens group L32 may be a vibration-proof group that corrects image blur due to camera shake or the like by moving in a direction orthogonal to the optical axis.

  The fourth lens unit L4 corresponds to the 24th to 26th surfaces, and includes a cemented lens of a meniscus convex lens having a convex surface on the image side and a biconcave lens. The fourth lens unit L4 is a focusing unit that moves to the image side when focusing from the infinity side to the close side.

  The fifth lens unit L5 corresponds to the 27th to 31st surfaces and includes a cemented lens of a meniscus concave lens having a convex object surface and a biconvex lens, and a biconvex lens. The 30th and 31st surfaces are aspherical surfaces, and mainly correct the variation in field curvature due to zooming.

  Table 1 shows values corresponding to the conditional expressions of this example. The present embodiment satisfies the expressions (1) to (7), and achieves a zoom lens having a wide angle and a high zoom ratio and high optical performance over the entire zoom range while reducing the size of the entire system. .

  FIG. 7 is a lens cross-sectional view of a zoom lens that is Embodiment 4 (Numerical Embodiment 4) of the present invention when focused at infinity at the wide-angle end. 8A is a longitudinal aberration diagram at the wide-angle end, FIG. 8B is a focal length of 63 mm, and FIG. 8C is a longitudinal aberration diagram at the telephoto end. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 7, the first lens unit L1 having a positive refractive power is provided in order from the object side. Further, the second lens unit L2 has a negative refracting power 21st lens unit L21 that moves to the image side upon zooming from the wide-angle end to the telephoto end, and a zoom lens from the wide-angle end to the telephoto end. The zoom lens includes a twenty-second lens unit L22 having positive refractive power for zooming that moves toward the image side. In the present embodiment, the twenty-first lens unit L21 is the second A lens unit that has the largest amount of movement from the object side to the image side upon zooming from the wide-angle end to the telephoto end. Further, the third lens unit L3 includes a positive power for zooming 31st lens unit L31 that moves on the optical axis upon zooming from the wide-angle end to the telephoto end, and zooming from the wide-angle end to the telephoto end. At this time, the zoom lens includes a thirty-second lens unit L32 having a positive refractive power for zooming and moving on the optical axis. In the present embodiment, the third lens unit L31 has the largest amount of movement from the image side to the object side during zooming from the wide-angle end to the telephoto end among the lens units having positive refractive power. It is.

  Further, a negative fourth lens unit L4 that moves non-linearly on the optical axis in conjunction with the movement of the second lens unit L2 and the third lens unit L3 and corrects the image plane variation due to zooming is provided. ing. Further, the fourth lens unit L4 moves to the image side during focusing from the infinity side to the close side. Further, the fifth lens unit moves so as to be positioned on the image side at the telephoto end with respect to the wide angle end during zooming. SP is an aperture stop, and I is an image plane.

  The first lens unit L1 in the present embodiment will be described. The first lens unit L1 corresponds to the first surface to the seventh surface. The first lens unit L1 includes a cemented lens of a meniscus concave lens having a convex surface on the object side and a biconvex lens, a biconvex lens, and a meniscus convex lens having a convex surface on the object side.

  The twenty-first lens unit L21 corresponds to the eighth to thirteenth surfaces and includes a biconcave lens, a biconcave lens, and a biconcave lens. Further, the tenth and eleventh surfaces are aspherical, and mainly correct the field curvature due to zooming and fluctuations in coma aberration in the peripheral image height. The twenty-second lens unit L22 corresponds to the thirteenth to fourteenth surfaces and is composed of a biconvex lens.

  The thirty-first lens unit L31 corresponds to the seventeenth to twenty-second surfaces and includes a biconvex lens, a convex meniscus concave lens on the object side, and a biconvex lens. In addition, the 17th and 18th surfaces are aspherical, and mainly correct variations in spherical aberration due to zooming. The thirty-second lens unit L32 corresponds to the twenty-third to twenty-fifth surfaces, and includes a cemented lens of a convex meniscus convex lens on the object side and a convex meniscus convex lens on the object side. The thirty-second lens group may be an anti-vibration group that corrects image blur due to camera shake or the like by moving in a direction orthogonal to the optical axis.

  The fourth lens unit L4 corresponds to the 26th to 28th surfaces, and is composed of a cemented lens of a biconvex lens and a biconcave lens. The fourth lens unit L4 is a focusing unit that moves to the image side when focusing from the infinity side to the close side.

  The fifth lens unit L5 corresponds to the 29th to 33rd surfaces and includes a cemented lens and a biconvex lens of a meniscus convex lens having a convex surface on the image side and a meniscus concave lens having a convex surface on the image side. The 32nd and 33rd surfaces are aspherical surfaces, and mainly correct the fluctuations in the curvature of field caused by zooming.

  Table 1 shows values corresponding to the conditional expressions of this example. The present embodiment satisfies the expressions (1) to (7), and achieves a zoom lens having a wide angle and a high zoom ratio and high optical performance over the entire zoom range while reducing the size of the entire system. .

  FIG. 9 is a lens cross-sectional view of a zoom lens that is Embodiment 5 (Numerical Embodiment 5) of the present invention when focused at infinity at the wide-angle end. 10A is a longitudinal aberration diagram at the wide angle end, FIG. 10B is a focal length of 57 mm, and FIG. 10C is a longitudinal aberration diagram at the telephoto end. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 9, the first lens unit L1 having a positive refractive power is provided in order from the object side. The second lens unit L2 includes one lens unit (second A lens unit L2A). The second lens unit L2 has a negative refractive power and moves to the image side upon zooming from the wide-angle end to the telephoto end. In the present embodiment, the second lens unit L2 is the second A lens unit L2A that has the largest amount of movement from the object side to the image side upon zooming from the wide-angle end to the telephoto end. The third lens unit L3 includes one lens unit (third A lens unit L3A). The third lens unit L3 has a positive refractive power and moves non-linearly on the optical axis upon zooming from the wide-angle end to the telephoto end. In the present embodiment, the third lens unit L3 has the largest amount of movement from the image side to the object side during zooming from the wide-angle end to the telephoto end among the lens units having positive refractive power. L3A.

  Further, a negative fourth lens unit L4 that moves non-linearly on the optical axis in conjunction with the movement of the second lens unit L2 and the third lens unit L3 and corrects the image plane variation due to zooming is provided. ing. Further, the fourth lens group moves to the image side when focusing from the infinity side to the close side. Further, the fifth lens unit moves so as to be positioned on the image side at the telephoto end with respect to the wide angle end during zooming. SP is an aperture stop, P is a prism or filter, and I is an image plane.

  The first lens unit L1 in the present embodiment will be described. The first lens unit L1 corresponds to the first surface to the seventh surface. The first lens unit L1 includes a cemented lens of a meniscus concave lens having a convex surface on the object side and a biconvex lens, a meniscus convex lens having a convex surface on the object side, and a meniscus convex lens having a convex surface on the object side.

  The second lens unit L2 corresponds to the eighth to thirteenth surfaces and includes a biconcave lens, a biconcave lens, and a biconvex lens. Further, the tenth and eleventh surfaces are aspherical, and mainly correct the field curvature due to zooming and fluctuations in coma aberration in the peripheral image height.

  The third lens unit L3 corresponds to the fifteenth to twenty-third surfaces, and includes a biconvex lens, a convex meniscus concave lens on the object side, a biconvex lens, and a cemented lens of a convex meniscus concave lens on the object side and a biconvex lens. The fifteenth, sixteenth, and twenty-third surfaces are aspherical, and mainly correct variations in spherical aberration caused by zooming. The cemented lens corresponding to the 21st surface to the 23rd surface in the third lens group may be an anti-vibration group that corrects image blur due to camera shake or the like by moving in a direction orthogonal to the optical axis. The aspheric surface of the 23rd surface is effective in suppressing fluctuations in coma during vibration isolation.

  The fourth lens unit L4 corresponds to the 24th to 26th surfaces and includes a cemented lens of a biconvex lens and a biconcave lens. The fourth lens unit L4 is a focusing unit that moves to the image side when focusing from the infinity side to the close side.

  The fifth lens unit L5 corresponds to the 27th to 31st surfaces and includes a cemented lens of a meniscus convex lens having a convex surface on the image side and a meniscus concave lens having a convex surface on the image side, and a biconvex lens. The thirtieth surface is an aspheric surface, and mainly corrects variations in curvature of field due to zooming.

  Table 1 shows values corresponding to the conditional expressions of this example. The present embodiment satisfies the expressions (1) to (7), and achieves a zoom lens having a wide angle and a high zoom ratio and high optical performance over the entire zoom range while reducing the size of the entire system. .

  FIG. 11 is a lens cross-sectional view of a zoom lens that is Embodiment 6 (Numerical Embodiment 6) of the present invention when focused at infinity at the wide-angle end. 12A is a longitudinal aberration diagram at the wide angle end, FIG. 12B is a focal length of 52 mm, and FIG. 12C is a longitudinal aberration diagram at the telephoto end. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 11, the first lens unit L1 having a positive refractive power is provided in order from the object side. The second lens unit L2 includes one lens unit (second A lens unit L2A). The second lens unit L2 has a negative refractive power and moves to the image side upon zooming from the wide-angle end to the telephoto end. In the present embodiment, the second lens unit L2 is the second A lens unit L2A that has the largest amount of movement from the object side to the image side upon zooming from the wide-angle end to the telephoto end. The third lens unit L3 includes one lens unit (third A lens unit L3A). The third lens unit L3 has a positive refractive power and moves on the optical axis upon zooming from the wide-angle end to the telephoto end. In the present embodiment, the third lens unit L3 has the largest amount of movement from the image side to the object side during zooming from the wide-angle end to the telephoto end among the lens units having positive refractive power. L3A.

  Further, a negative fourth lens unit L4 that moves non-linearly on the optical axis in conjunction with the movement of the second lens unit L2 and the third lens unit L3 and corrects the image plane variation due to zooming is provided. ing. Further, the fourth lens unit L4 moves to the image side during focusing from the infinity side to the close side. Further, the fifth lens unit L5 moves so as to be positioned on the image side at the telephoto end with respect to the wide angle end during zooming. SP is an aperture stop, and I is an image plane.

  The first lens unit L1 in the present embodiment will be described. The first lens unit L1 corresponds to the first surface to the seventh surface. The first lens unit L1 includes a cemented lens of a meniscus concave lens having a convex surface on the object side, a meniscus convex lens having a convex surface on the object side, a biconvex lens, and a meniscus convex lens having a convex surface on the object side.

  The second lens unit L2 corresponds to the eighth to fifteenth surfaces, and includes a biconcave lens, a biconcave lens, a biconvex lens, and a biconvex lens. Further, the tenth and eleventh surfaces are aspherical, and mainly correct the field curvature due to zooming and fluctuations in coma aberration in the peripheral image height.

  The third lens unit L3 corresponds to the 17th to 25th surfaces, and includes a biconvex lens, a convex meniscus concave lens on the object side, a biconvex lens, and a cemented lens of a convex meniscus concave lens on the object side and a biconvex lens. The 17th, 18th, and 25th surfaces are aspherical, and mainly correct variations in spherical aberration caused by zooming. The cemented lens corresponding to the 23rd surface to the 25th surface in the third lens group L3 may be a vibration proof group that corrects image blur due to camera shake or the like by moving in a direction orthogonal to the optical axis. The aspherical surface of the 25th surface is effective in suppressing fluctuations in coma during vibration isolation.

  The fourth lens unit L4 corresponds to the 26th to 28th surfaces, and includes a cemented lens of a meniscus convex lens having a convex surface on the image side and a biconcave lens. The fourth lens unit L4 is a focusing unit that moves to the image side when focusing from the infinity side to the close side.

  The fifth lens unit L5 corresponds to the 29th to 33rd surfaces and is composed of a cemented lens and a biconvex lens of a meniscus convex lens having a convex surface on the image side and a meniscus concave lens having a convex surface on the image side. The thirty-third surface is an aspheric surface, and mainly corrects variations in curvature of field due to zooming.

Table 1 shows values corresponding to the conditional expressions of this example. The present embodiment satisfies the expressions (1) to (7), and achieves a zoom lens having a wide angle and a high zoom ratio and high optical performance over the entire zoom range while reducing the size of the entire system. .

(Numerical example 1)
Unit mm

Surface data surface number rd nd vd
1 229.860 1.62 1.91082 35.3
2 46.425 6.56 1.49700 81.5
3 -341.001 0.17
4 53.681 3.88 1.49700 81.5
5 260.533 0.17
6 60.062 3.56 1.76385 48.5
7 542.179 (variable)
8 -313.126 0.90 1.83481 42.7
9 12.000 6.44
10 * -16.987 1.00 1.58313 59.4
11 * 58.173 0.66
12 108.295 2.63 1.89286 20.4
13 -38.695 (variable)
14 (Aperture) ∞ (Variable)
15 * 16.377 4.77 1.58313 59.4
16 * -75.354 4.52
17 240.353 0.63 1.83481 42.7
18 15.868 0.38
19 20.395 2.63 1.43875 94.7
20 -129.753 0.54
21 16.340 0.60 2.00069 25.5
22 11.928 4.20 1.55332 71.7
23 * -44.145 (variable)
24 296.005 1.41 1.84666 23.8
25 -21.925 0.82 1.79952 42.2
26 15.250 (variable)
27 -36.599 3.91 1.48749 70.2
28 -10.337 0.73 1.83481 42.7
29 -25.098 0.17
30 * 118.944 4.42 1.55332 71.7
31 -16.833 (variable)
32 ∞ 2.00 1.51633 64.1
33 ∞ (variable)
Image plane ∞

Aspheric data 10th surface
K = -9.99466e-001 A 4 = -1.74461e-005 A 6 = -1.76532e-007 A 8 = -9.00824e-010

11th page
K = -2.58899e + 000 A 4 = -3.88173e-005 A 6 = -1.17638e-007 A 8 = 3.93426e-010

15th page
K = -1.02141e + 000 A 4 = 1.37942e-005 A 6 = -9.19690e-010 A 8 = 6.92650e-012

16th page
K = -1.31620e + 000 A 4 = 1.77135e-005 A 6 = -6.12719e-008 A 8 = 8.82871e-011

23rd page
K = -1.30764e + 000 A 4 = 1.46688e-005 A 6 = -2.08326e-008 A 8 = -1.27278e-010

30th page
K = -5.06438e + 001 A 4 = -1.37923e-005 A 6 = -1.67057e-008 A 8 = 1.08519e-010

Various data Zoom ratio 20.00
Wide angle Medium telephoto focal length 8.50 57.08 170.00
F number 2.80 3.99 4.50
Half angle of view 37.18 7.40 2.50
Image height 6.45 7.41 7.41
Total lens length 140.53 140.53 140.53
BF 19.78 13.42 12.59

d 7 1.09 31.21 44.12
d13 43.89 13.77 0.86
d14 12.09 1.00 0.78
d23 1.51 11.00 9.16
d26 4.84 12.81 15.69
d31 10.00 3.63 2.81
d33 8.46 8.46 8.46

Zoom lens group data group Start surface Focal length
1 1 64.65
2 8 -12.06
3 14 ∞
sp 15 21.07
4 24 -21.19
5 27 36.53
P 32 ∞

(Numerical example 2)
Unit mm

Surface data surface number rd nd vd
1 192.439 1.62 1.91082 35.3
2 52.710 6.93 1.43875 94.9
3 -360.132 0.17
4 57.639 4.50 1.49700 81.5
5 340.073 0.17
6 72.120 3.54 1.76385 48.5
7 573.161 (variable)
8 -152.272 0.90 1.83481 42.7
9 13.424 7.43
10 * -19.986 1.00 1.58313 59.4
11 * 67.051 0.13
12 110.584 2.96 1.89286 20.4
13 -40.627 (variable)
14 (Aperture) ∞ (Variable)
15 * 16.402 4.87 1.58313 59.4
16 * -82.930 4.39
17 118.192 0.63 1.83481 42.7
18 14.441 0.14
19 16.509 2.55 1.43875 94.7
20 137.500 0.57
21 17.597 0.60 2.00069 25.5
22 12.953 3.99 1.55332 71.7
23 * -48.350 (variable)
24 76.918 1.61 1.84666 23.9
25 -38.604 0.82 1.83481 42.7
26 16.334 (variable)
27 -16.929 0.73 1.83481 42.7
28 -119.656 1.84 1.48749 70.2
29 -24.653 0.15
30 * 49.297 4.75 1.55332 71.7
31 * -16.761 (variable)
Image plane ∞

Aspheric data 10th surface
K = -1.03109e + 000 A 4 = -6.14255e-006 A 6 = -3.37820e-008 A 8 = -6.75811e-010

11th page
K = -1.00860e + 000 A 4 = -2.77492e-005 A 6 = -3.21566e-008 A 8 = -2.96028e-010

15th page
K = -1.02909e + 000 A 4 = 1.59677e-005 A 6 = 1.71624e-008 A 8 = 5.03587e-011

16th page
K = -6.87054e + 001 A 4 = 3.30576e-006 A 6 = 2.46695e-008 A 8 = -1.22398e-010

23rd page
K = -6.14349e-001 A 4 = 1.36909e-005 A 6 = -8.13698e-009 A 8 = -1.53402e-010

30th page
K = -4.75221e + 000 A 4 = -1.53913e-005 A 6 = 8.21843e-008 A 8 = -1.25964e-009

No. 31
K = -3.02663e + 000 A 4 = -5.94055e-005 A 6 = 2.39509e-007 A 8 = -1.83873e-009

Various data Zoom ratio 25.00
Wide angle Medium telephoto focal length 8.50 63.31 212.50
F number 2.80 4.34 5.00
Half angle of view 37.18 6.68 2.00
Image height 6.45 7.41 7.41
Total lens length 153.44 153.44 153.44
BF 20.78 13.56 12.80

d 7 1.45 36.43 51.42
d13 50.99 16.01 1.02
d14 15.98 2.73 0.83
d23 1.43 10.88 7.41
d26 5.83 16.85 22.98
d31 20.78 13.56 12.80

Zoom lens group data group Start surface Focal length
1 1 73.31
2 8 -13.56
3 14 ∞
sp 15 22.84
4 24 -25.61
5 27 41.55

(Numerical Example 3)
Unit mm

Surface data surface number rd nd vd
1 235.765 1.71 1.91082 35.3
2 59.823 7.89 1.43875 94.9
3 -263.656 0.15
4 61.039 5.32 1.43875 94.9
5 1048.824 0.15
6 65.722 4.18 1.76385 48.5
7 273.064 (variable)
8 -1040.122 0.89 1.88300 40.8
9 * 13.767 7.62
10 -20.527 0.68 1.59522 67.7
11 103.436 0.15
12 50.849 2.70 1.95906 17.5
13 -147.489 (variable)
14 (Aperture) ∞ (Variable)
15 * 15.694 4.81 1.58313 59.4
16 * -76.551 3.14
17 355.591 0.89 1.80610 40.9
18 14.851 0.52
19 19.003 3.98 1.43875 94.9
20 -42.363 (variable)
21 31.722 3.67 1.53775 74.7
22 -23.166 0.60 1.74077 27.8
23 -51.589 (variable)
24 -2047.847 1.85 1.95906 17.5
25 -37.738 0.85 1.83481 42.7
26 18.670 (variable)
27 265.043 0.76 2.00 100 29.1
28 39.948 2.70 1.48749 70.2
29 -218.481 0.10
30 * 30.827 3.50 1.49700 81.5
31 * -36.926 (variable)
32 ∞ 2.00 1.51633 64.1
33 ∞ (variable)
Image plane ∞

Aspheric data 9th surface
K = -6.87216e-001 A 4 = 1.54311e-005 A 6 = 4.67764e-008 A 8 = 8.13783e-010 A10 = -4.88459e-012 A12 = 2.78728e-014

15th page
K = 5.17960e-001 A 4 = -3.05597e-005 A 6 = -1.42033e-007 A 8 = -2.02945e-010 A10 = -2.52913e-012 A12 = -3.40317e-014

16th page
K = 1.44330e + 001 A 4 = 2.51292e-005 A 6 = -6.55589e-008 A 8 = 8.54556e-010 A10 = -8.55492e-012 A12 = 3.53815e-014

30th page
K = 3.80783e + 000 A 4 = -4.90627e-007 A 6 = -3.24867e-007 A 8 = 5.16029e-009

No. 31
K = -1.44605e + 001 A 4 = 8.00319e-007 A 6 = -2.80164e-007 A 8 = 5.90058e-009

Various data Zoom ratio 30.00
Wide angle Medium telephoto focal length 8.30 59.93 249.00
F number 2.80 4.76 5.60
Half angle of view 37.80 7.04 1.70
Image height 6.44 7.40 7.40
Total lens length 159.32 159.32 159.32
BF 16.53 12.90 10.55

d 7 0.95 37.34 52.93
d13 53.46 17.07 1.48
d14 17.70 4.44 1.26
d20 4.90 3.51 0.86
d23 1.83 11.52 5.95
d26 5.14 13.73 27.47
d31 7.98 4.35 2.00
d33 7.23 7.23 7.23

Zoom lens group data group Start surface Focal length
1 1 73.92
2 8 -13.00
sp 14 ∞
3 15 33.65
3 '21 44.89
4 24 -23.89
5 27 43.58
P 32 ∞

(Numerical example 4)
Unit mm

Surface data surface number rd nd vd
1 276.821 1.62 1.91082 35.3
2 49.164 5.94 1.49700 81.5
3 -743.123 0.17
4 57.518 4.06 1.49700 81.5
5 -817.239 0.17
6 54.463 2.44 1.76385 48.5
7 230.181 (variable)
8 -1211.866 0.90 1.83481 42.7
9 14.937 5.08
10 * -44.266 1.00 1.58313 59.4
11 * 106.763 2.53
12 -23.109 0.60 1.48749 70.2
13 35.997 (variable)
14 39.104 3.05 1.80810 22.8
15 -68.622 (variable)
16 (Aperture) ∞ (Variable)
17 * 18.912 3.55 1.55332 71.7
18 * -120.113 6.92
19 204.751 0.63 1.89190 37.1
20 22.820 0.69
21 48.572 2.88 1.43875 94.9
22 -23.162 (variable)
23 15.260 0.60 1.95375 32.3
24 11.627 2.97 1.48749 70.2
25 90.841 (variable)
26 551.459 1.66 1.89286 20.4
27 -23.442 0.82 1.85 150 40.8
28 20.336 (variable)
29 -19.362 2.59 1.48749 70.2
30 -12.168 0.73 2.00 100 29.1
31 -20.361 0.17
32 * 52.647 5.52 1.48749 70.2
33 * -15.291 (variable)
Image plane ∞

Aspheric data 10th surface
K = -2.48662e + 001 A 4 = 4.06423e-007 A 6 = -5.71638e-007 A 8 = 3.17499e-009

11th page
K = 3.60562e + 001 A 4 = 2.13754e-005 A 6 = -7.65502e-007 A 8 = 4.17109e-009

17th page
K = 1.89579e-001 A 4 = -1.02876e-005 A 6 = -2.97295e-008 A 8 = 1.63058e-010

18th page
K = -1.26325e + 002 A 4 = 1.01457e-005 A 6 = 1.51859e-008 A 8 = 1.47278e-010

32nd page
K = -9.30034e + 000 A 4 = -4.17318e-006 A 6 = -7.93777e-009 A 8 = 1.53054e-010

Side 33
K = -1.03132e + 000 A 4 = -1.28628e-006 A 6 = -4.97259e-008 A 8 = 2.22294e-010

Various data Zoom ratio 20.00
Wide angle Medium telephoto focal length 8.50 62.67 170.05
F number 2.70 4.80 5.60
Half angle of view 37.17 6.74 2.50
Image height 6.45 7.41 7.41
Total lens length 152.49 152.49 152.49
BF 23.63 19.03 14.87

d 7 1.00 28.96 40.95
d13 1.06 0.79 0.57
d15 40.28 12.59 0.82
d16 22.48 1.91 2.70
d22 0.48 0.64 0.48
d25 2.06 16.16 15.02
d28 4.22 15.13 19.79
d33 23.63 19.03 14.87

Zoom lens group data group Start surface Focal length
1 1 63.13
2 8 -7.42
2 '14 31.22
sp 16 ∞
3 17 35.50
3 '23 55.08
4 26 -26.06
5 29 35.41

(Numerical example 5)
Unit mm

Surface data surface number rd nd vd
1 200.160 1.62 1.91082 35.3
2 49.830 6.67 1.43875 94.9
3 -346.975 0.17
4 56.280 4.47 1.49700 81.5
5 353.544 0.17
6 63.512 3.72 1.76385 48.5
7 536.426 (variable)
8 -276.123 0.90 1.83481 42.7
9 12.146 6.43
10 * -16.949 1.00 1.58313 59.4
11 * 52.504 0.68
12 96.608 3.03 1.89286 20.4
13 -40.813 (variable)
14 (Aperture) ∞ (Variable)
15 * 16.601 5.15 1.58313 59.4
16 * -85.273 4.22
17 1376.882 0.63 1.83481 42.7
18 16.257 0.41
19 20.327 2.99 1.43875 94.7
20 -91.194 0.56
21 17.513 0.60 2.00069 25.5
22 13.037 4.36 1.55332 71.7
23 * -44.474 (variable)
24 176.669 1.46 1.84666 23.8
25 -23.360 0.82 1.79952 42.2
26 15.915 (variable)
27 -47.179 4.58 1.48749 70.2
28 -10.397 0.73 1.83481 42.7
29 -29.309 0.17
30 * 100.513 4.96 1.55332 71.7
31 -16.222 (variable)
32 ∞ 2.00 1.51633 64.1
33 ∞ (variable)
Image plane ∞

Aspheric data 10th surface
K = -8.20999e-001 A 4 = -1.12225e-005 A 6 = -2.37643e-007 A 8 = -1.27317e-010

11th page
K = -5.05902e + 000 A 4 = -3.52345e-005 A 6 = -1.27851e-007 A 8 = 6.14536e-010

15th page
K = -9.53633e-001 A 4 = 1.41187e-005 A 6 = 1.53126e-008 A 8 = -1.58031e-011

16th page
K = -2.37547e + 000 A 4 = 1.81523e-005 A 6 = -4.83346e-008 A 8 = 2.57254e-011

23rd page
K = -9.50529e-001 A 4 = 1.49634e-005 A 6 = 2.23430e-009 A 8 = -1.33166e-010

30th page
K = -5.34241e + 001 A 4 = -1.52436e-005 A 6 = -4.17505e-008 A 8 = 1.60379e-010

Various data Zoom ratio 20.00
Wide angle Medium Telephoto focal length 8.70 56.79 174.00
F number 2.80 3.99 4.50
Half angle of view 36.54 7.43 2.44
Image height 6.45 7.41 7.41
Total lens length 150.48 150.48 150.48
BF 19.01 12.77 12.58

d 7 1.16 33.73 47.69
d13 47.63 15.05 1.10
d14 10.25 1.70 2.52
d23 1.35 11.52 9.62
d26 10.57 15.19 16.47
d31 10.00 3.76 3.56
d33 7.69 7.69 7.69

Zoom lens group data group Start surface Focal length
1 1 68.15
2 8 -11.89
sp 14 ∞
3 15 21.98
4 24 -23.21
5 27 36.00
p 32 ∞

(Numerical example 6)
Unit mm

Surface data surface number rd nd vd
1 155.757 1.50 1.90366 31.3
2 44.188 5.52 1.49700 81.5
3 487.330 0.30
4 108.306 3.12 1.49700 81.5
5 -329.509 0.20
6 39.517 3.76 1.77250 49.6
7 193.793 (variable)
8 -447.877 1.00 1.88300 40.8
9 11.713 6.11
10 * -18.266 1.00 1.58313 59.4
11 * 26.306 0.56
12 66.806 1.00 1.43875 94.9
13 -582.755 0.96
14 72.122 2.22 1.92286 18.9
15 -66.408 (variable)
16 (Aperture) ∞ (Variable)
17 * 22.631 3.76 1.58313 59.4
18 * -74.416 5.25
19 137.585 1.00 1.83400 37.2
20 19.050 0.05
21 19.495 4.66 1.43700 95.1
22 -25.499 0.50
23 26.259 0.70 1.95375 32.3
24 18.438 2.97 1.48749 70.2
25 * -233.237 (variable)
26 -73.486 1.74 1.85478 24.8
27 -15.840 0.70 1.80 400 46.5
28 29.275 (variable)
29 -531.192 3.78 1.49700 81.5
30 -17.988 1.00 2.00069 25.5
31 -40.740 0.17
32 47.443 4.86 1.48749 70.2
33 * -20.117 (variable)
Image plane ∞

Aspheric data 10th surface
K = 0.00000e + 000 A 4 = 2.05821e-005 A 6 = -3.51251e-007 A 8 = 5.72479e-010

11th page
K = 0.00000e + 000 A 4 = -4.94096e-005 A 6 = -2.36657e-007 A 8 = 1.48851e-009

17th page
K = 0.00000e + 000 A 4 = -5.51869e-006 A 6 = 6.94676e-008 A 8 = -7.16481e-010

18th page
K = 0.00000e + 000 A 4 = 1.99184e-005 A 6 = 7.35516e-008 A 8 = -8.86932e-010

25th page
K = 0.00000e + 000 A 4 = -2.56536e-006 A 6 = -6.16050e-008 A 8 = 7.83911e-010

Side 33
K = 0.00000e + 000 A 4 = 3.47185e-005 A 6 = -2.68467e-008 A 8 = 1.23044e-010

Various data Zoom ratio 15.00
Wide-angle Medium Telephoto focal length
F number 2.85 4.10 4.60
Angle of view 37.50 8.15 3.37
Image height 6.45 7.41 7.41
Total lens length 147.68 147.68 147.68
BF 18.09 15.63 13.10

d 7 1.21 25.37 35.72
d15 35.78 11.62 1.26
d16 16.21 1.78 3.55
d25 2.52 17.75 19.01
d28 15.49 17.14 16.65
d33 18.09 15.63 13.10

Zoom lens group data group Start surface Focal length
1 1 56.70
2 8 -10.58
sp 16 ∞
3 17 23.64
4 26 -27.59
5 29 32.70

L1 1st lens group L2 2nd lens group L3 3rd lens group L4 4th lens group L5 5th lens group L2A 2A lens group L3A 3A lens group

Claims (9)

In order from the object side to the image side, the first lens unit having a positive refractive power that does not move for zooming, and the amount of movement from the object side to the image side for zooming from the wide-angle end to the telephoto end is the largest. A second lens unit including a second negative lens unit having a large negative refractive power and composed of one or two lens units, and a movement from the image side to the object side for zooming from the wide-angle end to the telephoto end A third lens group including the third lens group of positive refractive power having the largest amount and including one or two lens groups, and a fourth lens of negative refractive power that moves for zooming and focusing. A lens group, and a fifth lens group having a positive refractive power that moves from the object side to the image side for zooming from the wide-angle end to the telephoto end,
The distance between any two adjacent lens groups changes due to zooming,
The fifth lens group includes a positive lens and a negative lens,
The amount of movement of the second A lens group in zooming from the wide-angle end to the telephoto end is m2, and the amount of movement of the third A lens group in zooming from the wide-angle end to the telephoto end is m3. The distance between the fourth lens group and the fifth lens group at the wide angle end is d45w, and the fourth lens group and the fifth lens at the telephoto end are in focus at infinity. The distance from the group is d45t,
-8.0 <m2 / m3 <-1.5
0.9 <d45t / d45w <10.0
A zoom lens satisfying the following conditional expression:
However, the movement amount is positive when the position of the second A lens group at the telephoto end is closer to the image side than the position of the second A lens group at the wide angle end, and the second A lens at the wide angle end is positive. The difference between the position of the group and the position of the second A lens group at the telephoto end is defined as the difference. The focal length of the fourth lens group is f4, and the focal length of the fifth lens group is f5.
−0.95 <f4 / f5 <−0.45
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. The focal length of the first lens group is f1, and the focal length at the wide angle end of the second lens group is f2w.
−6.5 <f1 / f2w <−4.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. An average Abbe number of positive lenses included in the fifth lens group is νd5p, and an average Abbe number of negative lenses included in the fifth lens group is νd5n.
20 <νd5p−νd5n <60
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.   5. The zoom lens according to claim 1, further comprising an aperture stop between the second lens group and the third lens group.   The zoom lens according to claim 1, wherein the fifth lens group includes an aspherical surface. The lateral magnification of the fifth lens group at the infinity position and at the wide-angle end is β5w, and the lateral magnification of the fifth lens group at the infinity position and the telephoto end is β5t. As
1.05 <β5t / β5w <1.70
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.   The zoom lens according to claim 1, wherein the first lens group includes at least three lenses. The zoom lens according to any one of claims 1 to 8,
An image sensor disposed on the image plane of the zoom lens;
An imaging device comprising:

Images