JP2016048319A - Zoom lens and image capturing device having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a zoom lens that offers a wide view angle of approximately 67° at the wide-angle end, a high zoom ratio of approximately 100x, and superior optical performance over an entire zoom range.SOLUTION: A zoom lens comprises, in order from the object side to the image side; a first lens group that is stationary when zooming and has positive refractive power; a second lens group for zooming that has negative refractive power; a third lens group for zooming that has positive refractive power; a fourth lens group for correcting image plane variation associated with zooming that has negative refractive power; and a fifth lens group that is stationary when zooming and has positive refractive power. The zoom lens has a zoom position m that satisfies L3m/L3w<1.0 within a range of 0.0<M2m/M2t<0.5, and satisfies conditional expressions of -4.0<f4/f3<-1.0, 15<L2w/L3w<200.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a zoom lens and an image pickup apparatus having the same, and is suitable for a broadcast television camera, a video camera, a digital still camera, a surveillance camera, a silver salt photography camera, and the like.

  2. Description of the Related Art In recent years, zoom lenses having a wide angle of view, a high zoom ratio, and high optical performance have been demanded for imaging devices such as television cameras, silver salt film cameras, digital cameras, and video cameras. As a zoom lens having a wide angle of view and a high zoom ratio, a positive lead type five-group zoom lens including five lens groups in which a lens group having a positive refractive power is disposed closest to the object side is known (Patent Documents 1 to 5). 3).

  In Examples of Patent Documents 1 to 3, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, The fifth lens unit has a positive refractive power for image formation. A zoom lens in which the second, third, and fourth lens groups move during zooming has been proposed.

  Patent Document 1 discloses a five-group zoom lens having a zoom ratio of about 5 times and a photographing field angle of about 43 degrees at the wide angle end. Patent Document 2 discloses a 5-group zoom lens having a zoom ratio of about 3 times and a shooting field angle of about 34 degrees at the wide-angle end. Patent Document 3 discloses a 5-group zoom lens having a zoom ratio of about 19 times and a shooting field angle of about 76 degrees at the wide angle end.

Japanese Patent Laid-Open No. 10-039216 JP 2010-191336 A Japanese Patent No. 03827251

  In a five-group zoom lens, in order to obtain high optical performance while maintaining a wide angle of view and a high zoom ratio, it is important to appropriately set the refractive power and configuration of each lens group. In particular, it is important to appropriately set the movement conditions, refractive power, and the like of each zoom movement group. If these are not set appropriately, it becomes difficult to obtain a zoom lens having a wide angle of view and a high zoom ratio and high optical performance over the entire zoom range.

  In particular, the positive first lens group tends to increase the lens diameter (effective diameter) when trying to achieve a high zoom ratio of about 70 to 100 times. The size and weight of the first lens group are the main factors for increasing the size and mass of the entire lens, and greatly affect the operability of the camera lens. For this reason, it is important to reduce the size and weight of the first lens group.

  The present invention provides a zoom lens having a wide angle of view of about 60 ° to 70 ° at a wide angle end, a high zoom ratio of about 70 to 100 times, and high optical performance over the entire zoom range, and an imaging apparatus having the same. With the goal.

In the configuration of the present invention, in order from the object side to the image side, a first lens unit having a positive refractive power that does not move during zooming, a second lens unit having a negative refractive power for zooming, and a positive lens for zooming A zoom lens composed of a third lens unit having a negative refractive power, a fourth lens unit having a negative refractive power that corrects image plane variation caused by zooming, and a fifth lens unit having a positive refractive power that does not move during zooming. In the lens,
The amount by which the second lens group moves in the optical axis direction from the wide-angle end to the telephoto end is M2t,
The amount by which the second lens group moves from the wide angle end to the predetermined zoom position m is M2m,
The distance between the third lens group and the fourth lens group at a predetermined zoom position m is L3m,
The focal length of the third lens group is f3,
The focal length of the fourth lens group is f4,
The distance between the second lens group and the third lens group at the wide angle end is L2w.
When the distance between the third lens group and the fourth lens group at the wide angle end is L3w,
0.0 <M2m / M2t <0.5
Within the scope of
L3m / L3w <1.0
There is a predetermined zoom position m that satisfies
And,
-4.0 <f4 / f3 <-1.0
15 <L2w / L3w <200
It satisfies the following conditional expression.

  According to the present invention, it is possible to obtain a zoom lens having a wide angle of view, a high zoom ratio, and high optical performance over the entire zoom range, and an imaging apparatus having the same.

FIG. 3 is a lens cross-sectional view at the wide angle end of the zoom lens according to the first exemplary embodiment. (A), (B), and (C) are aberration diagrams of Example 1 at the wide-angle end, the focal length of 21.8 mm, and the telephoto end. 6 is a lens cross-sectional view at a wide angle end of a zoom lens according to Embodiment 2. FIG. (A), (B), and (C) are aberration diagrams of Example 2 at the wide-angle end, the focal length of 13.8 mm, and the telephoto end. 6 is a lens cross-sectional view at a wide angle end of a zoom lens according to Embodiment 3; FIG. (A), (B), and (C) are aberration diagrams of Example 3 at the wide-angle end, the focal length of 16.5 mm, and the telephoto end. 6 is a lens cross-sectional view at a wide angle end of a zoom lens according to Embodiment 4; FIG. (A), (B), and (C) are aberration diagrams of Example 4 at the wide-angle end, the focal length of 14.9 mm, and the telephoto end. 6 is a lens cross-sectional view at the wide-angle end of a zoom lens according to Example 5. FIG. (A), (B), and (C) are aberration diagrams of Example 5 at the wide-angle end, the focal length of 10.6 mm, and the telephoto end. 10 is a lens cross-sectional view at a wide angle end of a zoom lens according to Example 6. FIG. (A), (B), and (C) are aberration diagrams of Example 6 at the wide-angle end, the focal length of 16.2 mm, and the telephoto end. (A), (B) It is the schematic diagram of the zoom lens of this invention, and the schematic diagram of a 4 group zoom lens. It is the schematic of the paraxial principle of a 4 group zoom lens. It is the schematic of the paraxial principle of this invention. It is a principal part schematic of the imaging device of this 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 to the image side, a first lens group having a positive refractive power that does not move during zooming, a second lens group having a negative refractive power for zooming, and a zoom lens for zooming. A third lens group having a positive refractive power and a fourth lens group having a negative refractive power for correcting an image plane variation caused by zooming. Further, for zooming, it is composed of a fifth lens group having a positive refractive power that does not move.

  FIG. 1 is a lens cross-sectional view when focusing on an object at infinity at the wide angle end (short focal length end) of Numerical Example 1 as Embodiment 1 of the present invention. 2A, 2 </ b> B, and 2 </ b> C are longitudinal directions when focusing on an object at infinity at the wide-angle end, f = 21.8 mm, and the telephoto end (long focal length end) in Numerical Example 1. FIG. It is an aberration diagram.

  FIG. 3 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end of Numerical Example 2 as Embodiment 2 of the present invention. 4A, 4B, and 4C are longitudinal aberration diagrams when focusing on an object at infinity at the wide-angle end, f = 13.8 mm, and the telephoto end according to Numerical Example 2. FIG.

  FIG. 5 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end of Numerical Embodiment 3 as Embodiment 3 of the present invention. 6A, 6B, and 6C are longitudinal aberration diagrams when focusing on an object at infinity at the wide-angle end, f = 16.5 mm, and the telephoto end according to Numerical Example 3. FIG.

  FIG. 7 is a lens cross-sectional view when focusing on an object at infinity at the wide angle end according to Numerical Example 4 as Embodiment 4 of the present invention. 8A, 8B, and 8C are longitudinal aberration diagrams when focusing on an object at infinity at the wide-angle end, f = 14.9 mm, and the telephoto end according to Numerical Example 4. FIG.

  FIG. 9 is a lens cross-sectional view when focusing on an object at infinity at the wide angle end according to Numerical Example 5 as Example 5 of the present invention. 10A, 10B, and 10C are longitudinal aberration diagrams when focusing on an object at infinity at the wide-angle end, f = 10.6 mm, and the telephoto end according to Numerical Example 5. FIG.

  FIG. 11 is a lens cross-sectional view when focusing on an object at infinity at the wide angle end according to Numerical Example 6 as Example 6 of the present invention. 12A, 12B, and 12C are longitudinal aberration diagrams when focusing on an object at infinity at the wide-angle end, f = 16.2 mm, and the telephoto end according to Numerical Example 6. FIG.

  FIGS. 13A and 13B are a schematic diagram of the zoom lens of the present invention and a schematic diagram of a paraxial refractive power arrangement of the four-group zoom lens. In each lens cross-sectional view, the left side is the object (subject) side, and the right side is the image side. U1 is a first lens unit having positive refractive power that does not move during zooming. U2 is a second lens unit having a negative refractive power for zooming, and zooming is performed by moving on the optical axis. U3 is a third lens unit having positive refractive power for zooming, and zooming is performed by moving on the optical axis.

  U4 is a fourth lens unit having a negative refractive power, and moves on the optical axis in order to correct image plane fluctuations accompanying zooming. SP is an aperture stop, and U5 is a fifth lens group (relay group) having a positive refractive power that has an image forming action that does not move during zooming. A focal length conversion converter (extender) or the like may be mounted in the fifth lens unit U5.

  In each aberration diagram, the straight line and the broken line in the spherical aberration are the e-line and the g-line, respectively. A solid line and an alternate long and short dash line in astigmatism are a sagittal image surface and a meridional image surface, respectively, and lateral chromatic aberration is represented by a g-line. ω is the paraxial half angle of view, and Fno is the F number.

  The zoom lens of each embodiment defines the refractive power arrangement of each lens group at the wide-angle end and the movement locus during zooming of the second lens group, the third lens group, and the fourth lens group. This effectively reduces the size and weight of the first lens unit U1 while achieving a wide angle of view and a high zoom ratio.

  Specifically, the amount by which the second lens group moves in the optical axis direction from the wide-angle end to the telephoto end is set to M2t. The amount by which the second lens group moves from the wide-angle end to a predetermined zoom position m is M2m. The distance between the third lens group and the fourth lens group at the zoom position m is L3m. Let the focal length of the third lens group be f3. Let the focal length of the fourth lens group be f4. The distance between the second lens group and the third lens group at the wide angle end is L2w. The distance between the third lens group and the fourth lens group at the wide angle end is L3w.

At this time,
0.0 <M2m / M2t <0.5 (1)
Within the range of L3m / L3w <1.0 (X)
There is a predetermined zoom position m that satisfies
And,
-4.0 <f4 / f3 <-1.0 (2)
15 <L2w / L3w <200 (3)
The following conditional expression is satisfied.

  In each embodiment, the movement trajectory of each lens group during zooming will be described with reference to FIGS. In order to clarify the contrast between the five-group zoom lens of the present invention shown in FIG. 13A and the four-group zoom lens shown in FIG. 13B, in FIG. 13A, the first to fifth lenses are shown. The group is indicated as U1 to U5. In FIG. 13B, the first to fourth lens groups are denoted as U1B to U4B.

  The zoom lens according to each embodiment of the present invention includes first to fifth lens units in order from the object side to the image side as shown in FIG. Specifically, the first lens unit U1 having a fixed positive refractive power at the time of zooming is provided. The zoom lens includes a second lens unit U2 having a negative refractive power for zooming, a third lens unit U3 having a positive refractive power, and a fourth lens unit U4 having a negative refractive power that corrects image plane variation caused by zooming. The zoom lens has a fifth lens unit U5 having a fixed positive refractive power upon zooming, and is constituted by U1 to U5.

  As shown in FIG. 13B, the movement trajectory of the third lens unit U3B of the four-group zoom lens is uniquely determined for image point correction accompanying the zooming movement of the second group U2B. When the second lens unit U2B moves linearly with zooming from the wide-angle end to the telephoto end, the third lens unit U3B moves nonlinearly toward the object side. As shown in FIGS. 14A and 14B, in the four-group zoom lens, the off-axis principal ray incident height H in the first lens unit U1B is close to the focal length fm that is the zoom intermediate position on the wide angle side during zooming. 'Will be the highest. 14A shows a conceptual diagram of lens arrangement at the wide-angle end, and FIG. 14B shows a lens arrangement near fm.

  On the other hand, as shown in FIG. 13A, in the five-unit zoom lens in each embodiment of the present invention, the effective diameter of the first lens unit is set by appropriately setting the movement locus of each variable power lens unit. Suppressed.

  15A and 15B are conceptual diagrams of a 5-group zoom lens according to the present invention, together with a comparative example. In FIGS. 15A and 15B, both the present embodiment and the comparative example have the same refractive power of each lens group, and differ only in the zooming movement locus. In the comparative example, the third lens unit and the fourth lens unit move along the same locus during zooming and are equivalent to the four-unit zoom lens. 15A and 15B, the solid line indicates the locus of the variable magnification movement group in the present invention, and the alternate long and short dash line indicates the movement locus of the variable magnification movement group of the comparative example. 15A and 15B, the focal lengths of the entire system of the present invention and the comparative example are the same.

  FIG. 15A shows the wide-angle end, and the lens arrangements of the present invention and the comparative example are equal. FIG. 15B shows the zoom position m. In the present invention, the distance between the first lens group and the second lens group and the distance between the third lens group and the fourth lens group are narrower than in the comparative example.

  As shown in FIG. 15B, the distance between the first lens unit U1 and the second lens unit U2 is reduced at the wide-angle zoom position m where the off-axis principal ray incident height H ′ of the first lens unit is the highest. As a result, the effective diameter of the first lens group is suppressed by reducing H ′.

  In the fifth group zoom lens according to the embodiment of the present invention, the focal length fm at a predetermined zoom position m is f1 as the focal length of the first lens group, and the lateral distance at the zoom position m of the Nth lens group (N = 1 to 5). When the magnification is βNm, it can be expressed by the following formula.

fm = f1 × (β2m × β3m × β4m × β5m) (Y)
However, each lateral magnification and focal length are values at an infinite object distance.
In addition, since it is a zoom lens, it is necessary that the image point satisfies a certain condition regardless of zooming.

  Since the fifth lens group does not move during zooming, the lateral magnification β5m does not change during zooming. Therefore, in order to obtain a predetermined fm, (β2m × β3m × β4m) need only be constant, but since the lens arrangement that can achieve the condition is not uniquely determined, each zooming movement group within a predetermined range. Can be selected.

  Narrowing the distance between the first lens unit U1 and the second lens unit U2 corresponds to reducing | β2m |. Therefore, in the embodiment of the present invention, in the zoom range on the wide angle side, the distance between the third lens group and the fourth lens group is reduced while the distance between the first lens group U1 and the second lens group U2 is reduced. The optical arrangement keeps the image point of the system constant and increases β3m × β4m.

  When the movement amount of the second lens unit U2 is suppressed, the absolute value of the lateral magnification β2m in the equation (Y) becomes small. Therefore, in order to make fm constant, it is necessary to increase β3m × β4m.

  Here, the combined focal length fab of the two lenses having the focal lengths fa and fb and the principal point interval e ′ can be expressed by the following equation.

1 / fab = 1 / fa + 1 / fb−e ′ / (fa × fb) (Z)
Therefore, when fa> 0, fb <0, and e ′> 0, the fab increases positively when the principal point interval e ′ is decreased.

  In this embodiment, the distance between the third lens unit U3 and the fourth lens unit U4 is narrower than the wide-angle end in the zoom range on the wide angle side, and the combined focal length of U3 and U4 is positively increased according to the equation (Z). Yes. As a result, the combined lateral magnification β3m × β4m of U3 and U4 is increased, and the image points of the entire system are fixed.

  In this embodiment, the amount of movement of the second lens group when the magnification is changed from the wide angle end to a predetermined focal length fm is M2m, and the amount of movement of the second lens group when the magnification is changed from the wide angle end to the telephoto end. Let M2t. In each embodiment, the zoom position at which the third and fourth lens groups are closest to each other within the range of 0 <M2m / M2t <0.5 is described in each numerical embodiment as a zoom intermediate focal length. In addition, longitudinal aberration diagrams at the zoom intermediate focal length, the wide-angle end, and the telephoto end are shown in the drawings corresponding to the respective examples.

  Conditional expression (1) relates to a range where there is a zoom position m that satisfies L3m / L3w <1.0 at the third and fourth lens group intervals L3w and L3m at the wide-angle end and a predetermined zoom intermediate position m. By satisfying conditional expression (1), the first lens unit U1 is mainly reduced in size and weight.

  If the conditional expression (1) is not satisfied, the lateral magnification of the third and fourth lens units becomes small at the focal length where H ′ is the highest, and the amount of movement of the second lens unit U2 cannot be suppressed. As a result, since H ′ cannot be effectively suppressed, the first lens unit U1 is not sufficiently reduced in size and weight, which is not preferable.

  Conditional expression (2) relates to the ratio between the focal length f3 of the third lens unit U3 and the focal length f4 of the fourth lens unit U4. By satisfying conditional expression (2), the zoom ratio is increased and the entire lens system is reduced in size.

  Exceeding the upper limit of conditional expression (2) is not preferable because the negative refractive power of the fourth lens unit U4 becomes strong, and the effective beam diameter of the first lens unit U1 increases on the telephoto side.

  If the lower limit value of conditional expression (2) is not reached, the positive refractive power of the third lens unit U3 becomes strong, so that the higher-order aberration increases due to an increase in curvature, and the variation in aberration during zooming is large. Therefore, it is not preferable.

  Conditional expression (3) relates to the ratio of the air interval L2w between the second lens unit U2 and the third lens unit U3 at the wide angle end and the air interval L3w between the third lens unit U3 and the fourth lens unit U4 at the wide angle end. By satisfying conditional expression (3), a wide angle of view and a high zoom ratio are achieved.

  If the upper limit of conditional expression (3) is exceeded, the distance between the third lens unit U3 and the fourth lens unit U4 becomes too small at the wide-angle end, and the third lens unit U3 and the fourth lens unit U4 may come into contact with each other. Is not preferable. Further, since the distance between the second lens unit U2 and the third lens unit U3 becomes too large at the wide angle end, it is disadvantageous for downsizing of the entire system, which is not preferable. If the lower limit of conditional expression (3) is not reached, the amount of movement relating to zooming of the second lens unit U2 becomes small, and it becomes difficult to obtain a sufficient zoom ratio, which is not preferable.

  More preferably, the numerical ranges of the conditional expressions (1a) to (3a) are set as follows.

0.1 <M2m / M2t <0.3 (1a)
−3.2 <f4 / f3 <−1.5 (2a)
25 <L2w / L3w <60 (3a)
Further, the focal lengths of the first lens unit U1, the second lens unit U2, and the third lens unit U3 are defined as f1, f2, and f3. The second and third lens group intervals and the third and fourth lens group intervals when the third and fourth lens groups are closest to each other within the range satisfying the conditional expression (1) are set to L2 mmin and L3 mmin, respectively. At this time,
−11.0 <f1 / f2 <−8.0 (4)
−0.5 <f2 / f3 <−0.3 (5)
20 <L2mmin / L3mmin <1000 (6)
It is preferable to satisfy one or more of the following conditions.

  Conditional expression (4) relates to the ratio between the focal length f1 of the first lens unit U1 and the focal length f2 of the second lens unit U2. By satisfying conditional expression (4), the zoom ratio is increased and the entire lens system is reduced in size.

  If the upper limit value of conditional expression (4) is exceeded, the focal length f2 of the second lens unit U2 becomes relatively longer than the focal length f1 of the first lens unit U1, and it is difficult to increase the zoom ratio. Because of the axial arrangement, it is difficult to increase the zoom ratio and reduce the size of the entire system, which is not preferable. If the lower limit value of conditional expression (4) is not reached, the focal length f1 of the first lens unit U1 becomes too long relative to the focal length f2 of the second lens unit U2, and the second lens is used to increase the zoom ratio. The amount of movement required by the group becomes large, which is disadvantageous for downsizing the entire system, which is not preferable.

  Conditional expression (5) relates to the ratio between the focal length f2 of the second lens unit U2 and the focal length f3 of the third lens unit U3. By satisfying conditional expression (5), the amount of movement associated with zooming of the zoom group is suppressed.

  If the upper limit value of conditional expression (5) is exceeded, the focal length f3 of the third lens unit U3 becomes too long relative to the focal length f2 of the second lens unit U2, and the movement required by the third lens unit during zooming is required. The amount becomes large, which is disadvantageous for downsizing of the entire system. If the lower limit of conditional expression (5) is not reached, the focal length f2 of the second lens unit U2 becomes too long relative to the focal length f3 of the third lens unit U3, and the movement required for the second lens unit during zooming is required. The amount becomes large, which is disadvantageous for downsizing of the entire system.

  Conditional expression (6) relates to the third and fourth lens group intervals at the wide-angle end and the third and fourth lens group intervals when the third and fourth lens groups are closest to each other within a range satisfying conditional expression (1).

  When the upper limit of conditional expression (6) is exceeded, the third and fourth lens group spacing L3mmin when the third and fourth lens groups are closest to each other within the range satisfying conditional expression (1) becomes too small. When the lens groups are driven at high speed, the lens groups may interfere with each other, which is not preferable in manufacturing. If the lower limit of conditional expression (6) is not reached, the third and fourth lens group spacing L3mmin when the third and fourth lens groups are closest to each other within the range satisfying conditional expression (1) becomes too large, and the first lens This is not preferable because the effect of reducing the size and weight of the group U1 is diminished.

  The third lens unit U3 preferably has at least one aspheric surface. By arranging an aspherical surface in the third lens unit U3 that can move freely during zooming, it becomes easy to effectively correct fluctuations in off-axis aberrations such as coma due to zooming.

  The fourth lens unit U4 is preferably composed of at least one negative lens and one positive lens. By using a concave lens and a convex lens for the fourth lens group that moves for image plane correction at the time of zooming, it becomes easy to effectively correct fluctuations of various aberrations due to zooming, particularly fluctuations of chromatic aberration.

  More preferably, the numerical ranges of the conditional expressions (4a) to (6a) are set as follows.

-10.0 <f1 / f2 <-9.0 (4a)
−0.39 <f2 / f3 <−0.45 (5a)
30 <L2mmin / L3mmin <80 (6a)
The features of the lens configurations of Numerical Examples 1 to 6 of the zoom lens according to the present invention will be described below. In the lens cross-sectional views of each embodiment, DG is a color separation prism, an optical filter, or the like, and is shown as a glass block in the corresponding drawing. IP is an image plane and corresponds to the imaging plane of the solid-state imaging device.

[Example 1]
The second lens group U2, the third lens group U3, and the fourth lens group U4, which are moving lens groups at the time of zooming in Example 1 corresponding to Numerical Example 1, will be described. The second lens unit U2 corresponds to the eleventh lens surface to the seventeenth lens surface in Numerical Example 1, and two negative lenses, a positive lens, and a negative lens are bonded in this order from the object side to the image side. It consists of a cemented lens.

  The third lens unit U3 corresponds to the eighteenth lens surface to the twenty-sixth lens surface in Numerical Example 1, and two positive lenses, a positive lens, and a negative lens are bonded in this order from the object side to the image side. It consists of a cemented lens and a positive lens.

  The fourth lens unit U4 corresponds to the 27th to 29th lens surfaces in Numerical Example 1, and is composed of a cemented lens in which a negative lens and a positive lens are bonded in this order from the object side to the image side. ing.

  Aspheric surfaces are used for the eleventh lens surface, the eighteenth lens surface, and the twenty-sixth lens surface, respectively. The eleventh lens surface mainly corrects distortion on the wide-angle side, the eighteenth lens surface corrects off-axis aberrations such as coma on the wide-angle side, and the twenty-sixth lens surface corrects spherical aberration on the telephoto side.

  Table 1 shows the corresponding values of the conditional expressions in this example. In this numerical example, both conditional expressions are satisfied, and while achieving good optical performance, the focal length of the wide-angle end is 9 mm, the wide angle of view is 100 times the zoom ratio, and the high zoom ratio of the first lens unit U1. The lens diameter on the most object side is 196.36 mm, and the size and weight are reduced.

[Example 2]
The second lens group U2, the third lens group U3, and the fourth lens group U4, which are moving lens groups at the time of zooming in Example 2 corresponding to Numerical Example 2, will be described. The second lens unit U2 corresponds to the eleventh lens surface to the eighteenth lens surface in Numerical Example 2, and is composed of two negative lenses, a positive lens, and a negative lens in order from the object side to the image side. ing.

  The third lens unit U3 corresponds to the 19th to 27th lens surfaces in Numerical Example 2, and two positive lenses, a negative lens, and a positive lens are bonded in this order from the object side to the image side. And a positive lens.

  The fourth lens unit U4 corresponds to the 28th to 29th lens surfaces in Numerical Example 2, and is constituted by a negative lens.

  Aspheric surfaces are used for the eleventh lens surface, the twenty-second lens surface, and the twenty-seventh lens surface, respectively. The eleventh lens surface mainly corrects distortion on the wide-angle side, the twenty-second lens surface corrects off-axis aberrations such as coma on the wide-angle side, and the twenty-seventh lens surface corrects spherical aberration on the telephoto side.

  In this example, the fourth lens group is composed of one negative lens, but all the conditional expressions are satisfied as shown in Table 1, and good optical performance is achieved. In addition, the lens diameter on the most object side of the first lens unit U1 is 195.37 mm while achieving a focal length of 8.9 mm at the wide-angle end, a wide angle of view of 90 times the zoom ratio, and a high zoom ratio.

[Example 3]
The second lens unit U2, the third lens unit U3, and the fourth lens unit U4, which are moving lens units at the time of zooming in Example 3 corresponding to Numerical Example 3, will be described. The second lens unit U2 corresponds to the eleventh lens surface to the seventeenth lens surface in Numerical Example 3, and two negative lenses, a positive lens, and a negative lens are bonded in this order from the object side to the image side. It consists of a cemented lens.

  The third lens unit U3 corresponds to the 18th to 26th lens surfaces in Numerical Example 3, and two positive lenses, a positive lens, and a negative lens are bonded in this order from the object side to the image side. And a positive lens.

  The fourth lens unit U4 corresponds to the 27th to 29th lens surfaces in Numerical Example 3, and is composed of a cemented lens in which a negative lens and a positive lens are bonded in this order from the object side to the image side. ing.

  Aspheric surfaces are used for the eleventh lens surface, the eighteenth lens surface, and the twenty-sixth lens surface, respectively. The eleventh lens surface mainly corrects distortion on the wide-angle side, the eighteenth lens surface corrects off-axis aberrations such as coma on the wide-angle side, and the twenty-sixth lens surface corrects spherical aberration on the telephoto side.

  Table 1 shows the corresponding values of the conditional expressions in this example. In this numerical example, all the conditional expressions are satisfied, and the first lens unit is achieved while achieving good optical performance, a focal length of 8.7 mm at the wide-angle end, a wide angle of view with a zoom ratio of 80 times, and a high zoom ratio. The lens diameter on the most object side of U1 is 194.22 mm, so that the size and weight are reduced.

[Example 4]
The second lens unit U2, the third lens unit U3, and the fourth lens unit U4, which are moving lens units at the time of zooming in Example 4 corresponding to Numerical Example 4, will be described. The second lens unit U2 corresponds to the eleventh lens surface to the seventeenth lens surface in Numerical Example 4, and two negative lenses, a positive lens, and a negative lens are bonded in this order from the object side to the image side. It consists of a cemented lens.

  The third lens unit U3 corresponds to the 18th to 26th lens surfaces in Numerical Example 4. In order from the object side to the image side, the lens includes two positive lenses, a cemented lens in which a positive lens and a negative lens are bonded together in this order, and a positive lens.

  The fourth lens unit U4 corresponds to the twenty-seventh lens surface to the twenty-ninth lens surface in Numerical Example 4, and is composed of a cemented lens in which a positive lens and a negative lens are bonded in this order from the object side to the image side. ing.

  Aspheric surfaces are used for the eleventh lens surface, the eighteenth lens surface, and the twenty-sixth lens surface, respectively. The eleventh lens surface mainly corrects distortion on the wide-angle side, the eighteenth lens surface corrects off-axis aberrations such as coma on the wide-angle side, and the twenty-sixth lens surface corrects spherical aberration on the telephoto side.

  Table 1 shows the corresponding values of the conditional expressions in this example. In this numerical example, both conditional expressions are satisfied, the first lens group is achieved while achieving good optical performance, a focal length of 8.8 mm at the wide-angle end, a wide angle of view with a zoom ratio of 95 times, and a high zoom ratio. The lens diameter on the most object side of U1 is 198.04 mm, so that the size and weight are reduced.

[Example 5]
The second lens unit U2, the third lens unit U3, and the fourth lens unit U4, which are movable lens units at the time of zooming in Example 5 corresponding to Numerical Example 5, will be described. The second lens unit U2 corresponds to the eleventh lens surface to the seventeenth lens surface in Numerical Example 5, and two negative lenses, a positive lens, and a negative lens are bonded in this order from the object side to the image side. It consists of a cemented lens.

  The third lens unit U3 corresponds to the 18th to 26th lens surfaces in Numerical Example 5. In order from the object side to the image side, the lens includes two positive lenses, a cemented lens in which a positive lens and a negative lens are bonded together in this order, and a positive lens.

  The fourth lens unit U4 corresponds to the 27th to 29th lens surfaces in Numerical Example 5, and is composed of a cemented lens in which a negative lens and a positive lens are bonded in this order from the object side to the image side. ing.

  Aspheric surfaces are used for the eleventh lens surface, the eighteenth lens surface, and the twenty-sixth lens surface, respectively. The eleventh lens surface mainly corrects distortion on the wide-angle side, the eighteenth lens surface corrects off-axis aberrations such as coma on the wide-angle side, and the twenty-sixth lens surface corrects spherical aberration on the telephoto side.

  Table 1 shows the corresponding values of the conditional expressions in this example. This numerical example satisfies all the conditional expressions, achieves good optical performance, has a focal length of 8.3 mm at the wide angle end, a wide angle of view with a zoom ratio of 85 times, and a high zoom ratio. The lens diameter on the most object side of U1 is 206.62 mm, so that the size and weight are reduced.

[Example 6]
The second lens unit U2, the third lens unit U3, and the fourth lens unit U4, which are moving lens units at the time of zooming in Example 6 corresponding to Numerical Example 6, will be described. The second lens unit U2 corresponds to the eleventh lens surface to the seventeenth lens surface in Numerical Example 6, and is a cemented lens in which a negative lens, a negative lens, and a positive lens are sequentially bonded in this order from the object side to the image side. And a negative lens.

  The third lens unit U3 corresponds to the eighteenth lens surface to the twenty-sixth lens surface in Numerical Example 6, and two positive lenses, a negative lens, and a positive lens are bonded in this order from the object side to the image side. And a positive lens.

  The fourth lens unit U4 corresponds to the 27th to 29th lens surfaces in the numerical example, and is configured by a cemented lens in which a negative lens and a positive lens are bonded in this order from the object side to the image side. Yes.

  Aspheric surfaces are used for the eleventh lens surface, the nineteenth lens surface, and the twenty-sixth lens surface, respectively. The eleventh lens surface mainly corrects distortion on the wide-angle side, the nineteenth lens surface corrects off-axis aberrations such as coma on the wide-angle side, and the twenty-sixth lens surface corrects spherical aberration on the telephoto side.

  Table 1 shows the corresponding values of the conditional expressions in this example. In this numerical example, both conditional expressions are satisfied, the first lens group is achieved while achieving good optical performance, a focal length of 9.5 mm at the wide-angle end, a wide field angle of 72 times the zoom ratio, and a high zoom ratio. The lens diameter on the most object side of U1 is 190.00 mm, so that the size and weight are reduced.

  FIG. 15 is a schematic diagram of a main part of an image pickup apparatus (television camera system) using the zoom lenses of Embodiments 1 to 6 of the present invention as a photographing optical system. In FIG. 16, 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 group F, a zoom unit LZ, and a fifth lens group R for image formation. The first lens group F includes a focusing lens group.

  The zooming unit LZ includes a second lens group and a third lens group that move on the optical axis for zooming, and a fourth lens group that moves on the optical axis to correct image plane variation accompanying zooming. include. SP is an aperture stop. The fifth lens group R includes lens units IE ′ and IE that can be inserted and removed from the optical path. By switching the lens units IE and IE ′, the focal length range of the entire zoom lens 101 is displaced. Reference numerals 114 and 115 denote driving mechanisms such as helicoids and cams for driving the first lens unit F and the zooming portion LZ in the optical axis direction, respectively. Reference numerals 116 to 118 denote motors (drive means) that electrically drive the drive mechanisms 114 and 115 and the aperture stop SP.

  Reference numerals 119 to 121 denote detectors such as an encoder, a potentiometer, or a photosensor for detecting the positions of the first lens group F and the zooming unit 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). Reference numerals 111 and 122 denote CPUs that control various types of driving of the camera 124 and the zoom lens 101.

  Thus, by applying the zoom lens of the present invention to a television camera, an imaging device having high optical performance is realized.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

  Next, numerical examples 1 to 6 corresponding to the first to sixth embodiments of the present invention will be described. In each numerical example, i indicates the order of the surfaces from the object side, ri is the radius of curvature of the i-th surface from the object side, di is the i-th distance from the i-th surface from the object side, and ndi and νdi are The refractive index and Abbe number of the i-th optical member. The last three surfaces are glass blocks such as filters. The focal length, F number, and angle of view represent values when focusing on an object at infinity. BF is a value obtained by air-converting the distance from the final surface of the glass block to the image plane.

  The aspherical shape is expressed by the following formula, where x is the coordinate in the optical axis direction, y is the coordinate in the direction perpendicular to the optical axis, R is the reference radius of curvature, k is the conic constant, and An is the nth-order aspherical coefficient. It is represented by However, “e-x” means “× 10-x”. A lens surface having an aspherical surface is marked with * on the left side of the surface number in each table.

x = (y ² / r) / {1+ (1−k · y ² / r ² ) ^0.5 } + A4 · y ⁴ + A6 · y ⁶ + A8 · y ⁸ + A10 · y ¹⁰ + A12 · y ¹²
Table 1 shows the correspondence between each embodiment and each conditional expression described above.

(Numerical example 1)
Unit mm

Surface data surface number rd nd vd Effective diameter
1 6632.596 6.00 1.83400 37.2 196.36
2 334.796 2.00 196.80
3 343.280 25.00 1.43387 95.1 197.89
4 -780.988 25.00 198.75
5 369.958 26.50 1.43387 95.1 202.95
6 -705.086 0.10 202.73
7 221.685 19.00 1.43387 95.1 196.95
8 668.299 1.48 195.63
9 198.633 16.50 1.49700 81.5 187.15
10 403.481 (variable) 184.63
11 * -491.871 2.20 2.00330 28.3 43.47
12 47.800 8.30 38.48
13 -53.712 1.45 1.88300 40.8 37.97
14 115.319 0.91 38.31
15 115.945 7.09 0.00000 17.5 38.70
16 -58.404 2.20 1.77250 49.6 38.77
17 604.584 (variable) 39.22
18 * 85.681 15.35 1.49700 81.5 81.49
19 -277.955 0.50 81.51
20 145.870 11.40 1.49700 81.5 80.23
21 -226.294 0.10 79.59
22 147.516 11.53 1.43875 94.9 74.25
23 -171.258 1.95 1.84666 23.8 72.51
24 378.364 1.00 69.92
25 127.931 6.51 1.49700 81.5 67.97
26 * -484.294 (variable) 66.79
27 ∞ 1.60 1.88 300 40.8 47.48
28 68.461 4.70 1.80809 22.8 45.45
29 169.071 (variable) 44.63
30 (Aperture) ∞ 5.00 29.36
31 -84.706 1.70 1.88300 40.8 27.68
32 68.204 4.55 1.80809 22.8 27.40
33 -68.232 2.00 27.31
34 -38.899 1.80 1.88300 40.8 26.87
35 45.379 4.50 1.80809 22.8 27.65
36 492.460 7.00 28.04
37 -287.220 2.00 1.72047 34.7 30.15
38 28.523 10.52 1.51633 64.1 31.85
39 -49.127 0.20 33.21
40 970.953 16.24 1.62041 60.3 34.43
41 -188.388 5.00 37.69
42 94.144 9.07 1.53172 48.8 39.50
43 -44.166 1.00 39.49
44 146.691 2.00 1.88300 40.8 35.36
45 27.695 10.32 1.51633 64.1 32.64
46 -139.287 1.00 31.79
47 -195.214 5.65 1.48749 70.2 31.21
48 -55.200 2.00 1.83400 37.2 30.21
49 -100.099 1.20 29.96
50 184.987 4.00 1.48749 70.2 28.75
51 -249.083 10.00 27.73
52 ∞ 33.00 1.60859 46.4 60.00
53 ∞ 13.20 1.51633 64.2 60.00
54 ∞ 10.00 60.00
Image plane ∞

Aspheric data 11th surface
K = 3.87001e-008 A 4 = 5.69989e-007 A 6 = 1.81982e-010 A 8 = -9.29556e-013 A10 = 2.42966e-015 A12 = -2.23609e-018

18th page
K = 0.00000e + 000 A 4 = 3.41822e-008 A 6 = 3.56974e-011 A 8 = -3.98779e-014 A10 = 1.66029e-017 A12 = -3.66398e-021

26th page
K = 0.00000e + 000 A 4 = 1.07577e-006 A 6 = 2.28913e-010 A 8 = -2.56816e-013 A10 = 2.63089e-016 A12 = -7.95027e-020

Various data Zoom ratio 100.00
Wide angle Medium telephoto focal length 9.00 21.85 900.00
F number 1.84 1.84 4.59
Half angle of view 31.43 14.13 0.35
Image height 5.50 5.50 5.50
Total lens length 651.84 651.84 651.84
BF 10.00 10.00 10.00

d10 1.50 69.66 189.21
d17 280.94 193.65 10.33
d26 4.53 2.90 65.35
d29 3.54 24.32 25.63

Entrance pupil position 129.46 289.90 12913.77
Exit pupil position 627.22 627.22 627.22
Front principal point position 138.59 312.52 15 126.10
Rear principal point position 1.00 -11.85 -890.00

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 250.00 121.58 68.42 -20.06
2 11 -25.70 22.15 3.44 -12.14
3 18 66.00 48.34 10.92 -23.49
4 27 -170.00 6.30 2.97 -0.46
5 30 51.22 152.95 55.76 -0.83

Single lens Data lens Start surface Focal length
1 1 -420.28
2 3 551.96
3 5 562.05
4 7 752.94
5 9 764.42
6 11 -42.97
7 13 -41.09
8 15 40.78
9 16 -68.52
10 18 133.26
11 20 179.77
12 22 182.19
13 23 -137.66
14 25 203.75
15 27 -77.13
16 28 138.02
17 31 -42.32
18 32 42.41
19 34 -23.35
20 35 60.95
21 37 -35.67
22 38 36.51
23 40 254.68
24 42 57.58
25 44 -38.75
26 45 45.54
27 47 155.28
28 48 -149.67
29 50 217.67
30 52 0.00
31 53 0.00


(Numerical example 2)
Unit mm

Surface data surface number rd nd vd Effective diameter
1 5463.548 6.00 1.83400 37.2 195.37
2 361.183 2.50 195.06
3 365.430 23.10 1.43387 95.1 196.23
4 -724.067 25.30 196.65
5 359.015 23.80 1.43387 95.1 200.44
6 -920.716 0.10 199.95
7 257.549 16.60 1.43387 95.1 193.39
8 762.140 1.00 191.76
9 202.922 14.90 1.49700 81.5 183.26
10 430.117 (variable) 181.45
11 * -818.817 2.20 2.00330 28.3 45.34
12 54.770 9.50 40.19
13 -41.344 1.45 1.81600 46.6 39.59
14 117.482 1.30 41.00
15 205.758 7.05 0.00000 17.5 41.75
16 -77.096 0.50 43.11
17 -242.758 1.90 1.72916 54.7 44.02
18 187.135 (variable) 45.22
19 163.058 14.30 1.49700 81.5 80.18
20 -142.713 0.10 81.09
21 110.273 11.00 1.43875 94.9 82.57
22 * -311.929 0.10 82.23
23 318.256 2.00 1.76182 26.5 81.41
24 113.457 12.00 1.43875 94.9 79.83
25 -291.197 0.75 79.59
26 183.877 8.00 1.49700 81.5 77.28
27 * -503.430 (variable) 76.57
28 -805.712 1.40 1.77250 49.6 43.32
29 95.576 (variable) 41.78
30 (Aperture) ∞ 5.00 29.70
31 -211.323 1.40 1.88300 40.8 28.17
32 76.748 0.20 27.81
33 36.782 3.05 1.84666 23.8 28.00
34 125.832 7.00 27.67
35 -33.712 1.40 1.85026 32.3 26.26
36 -1772.977 1.00 27.02
37 -477.321 5.61 1.84666 23.8 27.31
38 -33.945 1.80 1.78590 44.2 27.89
39 -85.357 1.00 28.55
40 ∞ 13.89 1.67003 47.2 28.68
41 -93.978 4.50 29.15
42 -51.309 3.53 1.48749 70.2 28.60
43 -33.762 0.70 28.81
44 510.271 1.60 1.80000 29.8 27.39
45 25.047 4.84 1.48749 70.2 26.29
46 82.462 1.20 26.29
47 147.629 4.65 1.51823 58.9 26.40
48 -43.305 1.60 1.83400 37.2 26.48
49 -44.870 0.20 26.71
50 36.688 3.86 1.48749 70.2 25.51
51 198.185 5.00 24.69
52 ∞ 33.00 1.60859 46.4 60.00
53 ∞ 13.20 1.51633 64.2 60.00
54 ∞ 10.00 60.00
Image plane ∞

Aspheric data 11th surface
K = -2.79830e + 001 A 4 = 1.39034e-006 A 6 = 3.21946e-010 A 8 = -2.12778e-012 A10 = 5.05261e-015 A12 = -2.36020e-018

22nd page
K = 0.00000e + 000 A 4 = 7.33646e-007 A 6 = -1.80747e-010 A 8 = 1.17959e-013 A10 = -4.44244e-017 A12 = 6.93481e-021

27th page
K = 0.00000e + 000 A 4 = -2.94099e-007 A 6 = 6.68256e-011 A 8 = 1.13263e-013 A10 = -1.37570e-016 A12 = 4.31274e-020

Various data Zoom ratio 90.00
Wide angle Medium telephoto focal length 8.90 13.84 801.00
F number 1.82 1.81 4.10
Half angle of view 31.72 21.67 0.39
Image height 5.50 5.50 5.50
Total lens length 619.07 619.07 619.07
BF 10.00 10.00 10.00

d10 2.00 30.35 196.21
d18 286.91 238.39 9.51
d27 10.16 7.40 84.20
d29 3.92 26.84 13.07

Entrance pupil position 126.51 177.23 10568.62
Exit pupil position -711.41 -711.41 -711.41
Front principal point position 135.30 190.81 10480.26
Rear principal point position 1.10 -3.84 -791.00

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 260.00 113.30 64.90 -18.79
2 11 -26.50 23.90 4.21 -13.33
3 19 66.00 48.25 14.76 -20.13
4 28 -110.00 1.40 0.70 -0.08
5 31 57.86 119.23 53.44 -12.32

Single lens Data lens Start surface Focal length
1 1 -461.04
2 3 561.96
3 5 597.21
4 7 885.52
5 9 754.26
6 11 -50.68
7 13 -37.13
8 15 58.42
9 17 -144.03
10 19 155.09
11 21 186.71
12 23 -230.37
13 24 187.32
14 26 271.25
15 28 -110.00
16 31 -63.25
17 33 59.84
18 35 -40.14
19 37 42.49
20 38 -72.45
21 40 139.56
22 42 189.31
23 44 -32.71
24 45 71.56
25 47 64.89
26 48 -2774.99
27 50 91.33
28 52 0.00
29 53 0.00


(Numerical Example 3)
Unit mm

Surface data surface number rd nd vd Effective diameter
1 7483.698 6.00 1.83400 37.2 194.22
2 367.131 2.00 193.12
3 374.503 23.50 1.43387 95.1 193.97
4 -711.789 22.98 194.55
5 392.862 20.00 1.43387 95.1 198.18
6 -1068.349 0.10 197.92
7 243.114 20.30 1.43387 95.1 192.42
8 2037.813 0.93 191.31
9 166.124 16.00 1.43875 94.9 177.71
10 336.092 (variable) 176.20
11 * -374.160 2.20 2.00330 28.3 45.65
12 43.803 10.00 39.68
13 -44.012 1.45 1.81600 46.6 39.30
14 107.567 1.12 41.10
15 135.961 7.10 0.00000 17.5 42.53
16 -77.925 1.80 1.69680 55.5 43.67
17 -157.168 (variable) 45.26
18 * 92.182 14.50 1.49700 81.5 75.24
19 -210.456 0.10 75.43
20 131.357 9.84 1.49700 81.5 74.68
21 -288.714 0.20 74.17
22 199.647 8.90 1.49700 81.5 71.13
23 -166.941 2.20 1.84666 23.8 70.20
24 445.294 0.50 68.13
25 194.863 6.08 1.49700 81.5 67.29
26 * -212.146 (variable) 66.60
27 -1274.270 1.40 1.88300 40.8 40.84
28 56.577 3.83 1.80518 25.4 39.22
29 176.192 (variable) 38.80
30 (Aperture) ∞ 5.00 27.27
31 -35.205 1.61 1.88300 40.8 26.37
32 537.083 4.47 1.80809 22.8 27.20
33 -48.781 2.89 27.66
34 -194.140 1.80 1.88300 40.8 27.16
35 151.411 5.95 27.17
36 -1752.268 1.50 1.72916 54.7 28.07
37 84.486 2.77 1.80518 25.4 28.36
38 -841.981 2.21 28.49
39 -2902.411 14.20 1.62041 60.3 28.78
40 -84.326 4.51 29.84
41 -374.173 5.23 1.51823 58.9 29.34
42 -45.700 0.45 29.24
43 -163.912 1.50 1.83400 37.2 28.29
44 34.002 6.78 1.51633 64.1 27.55
45 -49.281 1.15 27.57
46 843.054 5.52 1.48749 70.2 26.61
47 -39.436 1.50 1.83400 37.2 25.93
48 -154.919 0.25 25.83
49 46.802 4.34 1.48749 70.2 25.31
50 -120.000 5.00 24.68
51 ∞ 33.00 1.60859 46.4 50.00
52 ∞ 13.20 1.51633 64.2 50.00
53 ∞ 7.00 50.00
Image plane ∞

Aspheric data 11th surface
K = -4.79829e-008 A 4 = 1.14555e-006 A 6 = 2.16538e-010 A 8 = -1.50573e-012 A10 = 2.73258e-015 A12 = -1.71264e-018

18th page
K = 0.00000e + 000 A 4 = -5.00405e-008 A 6 = 9.25509e-011 A 8 = -5.93355e-014 A10 = 4.69683e-017 A12 = -1.56916e-020

26th page
K = 0.00000e + 000 A 4 = 8.78841e-007 A 6 = 2.18589e-010 A 8 = -2.93906e-013 A10 = 3.44972e-016 A12 = -1.28740e-019

Various data Zoom ratio 80.00
Wide angle Medium telephoto focal length 8.70 16.48 696.00
F number 1.74 1.74 3.60
Half angle of view 32.30 18.46 0.45
Image height 5.50 5.50 5.50
Total lens length 587.59 587.59 587.59
BF 7.00 7.00 7.00

d10 2.19 48.24 179.32
d17 258.59 195.99 7.66
d26 8.67 6.83 44.87
d29 3.28 21.66 40.88

Entrance pupil position 124.96 222.62 10869.93
Exit pupil position 1206.92 1206.92 1206.92
Front principal point position 133.72 239.33 11969.64
Rear principal point position -1.70 -9.48 -689.00

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 240.00 111.82 61.65 -20.62
2 11 -27.00 23.67 2.20 -16.00
3 18 65.00 42.32 10.41 -19.20
4 27 -150.00 5.23 2.12 -0.72
5 30 46.76 124.83 48.63 -9.95

Single lens Data lens Start surface Focal length
1 1 -460.16
2 3 567.89
3 5 663.13
4 7 632.48
5 9 725.94
6 11 -38.66
7 13 -37.92
8 15 51.82
9 16 -222.94
10 18 130.69
11 20 182.55
12 22 183.88
13 23 -141.77
14 25 204.78
15 27 -60.96
16 28 101.10
17 31 -37.15
18 32 54.96
19 34 -95.55
20 36 -110.02
21 37 94.61
22 39 139.17
23 41 99.51
24 43 -33.44
25 44 39.93
26 46 77.18
27 47 -63.41
28 49 69.43
29 51 0.00
30 52 0.00


(Numerical example 4)
Unit mm

Surface data surface number rd nd vd Effective diameter
1 -4797.504 6.00 1.83400 37.2 198.04
2 390.534 2.00 194.78
3 414.125 21.50 1.43387 95.1 195.45
4 -714.454 24.14 196.00
5 593.695 19.50 1.43387 95.1 201.51
6 -712.548 0.10 201.48
7 240.686 25.00 1.43387 95.1 197.59
8 ∞ 1.62 196.24
9 160.500 16.20 1.43875 94.9 180.68
10 305.437 (variable) 179.29
11 * -214.863 2.20 2.00330 28.3 47.93
12 69.851 8.60 43.13
13 -62.692 1.45 1.81600 46.6 41.83
14 110.878 1.44 41.37
15 150.339 7.10 0.00000 17.5 41.72
16 -65.706 1.80 1.72916 54.7 42.31
17 138.620 (variable) 43.86
18 * 96.722 14.50 1.49700 81.5 80.34
19 -243.052 0.10 80.64
20 134.803 14.00 1.49700 81.5 80.64
21 -169.022 0.20 80.01
22 252.868 9.22 1.43875 94.9 75.39
23 -163.420 2.20 1.84666 23.8 74.33
24 1203.533 0.50 72.45
25 179.286 6.08 1.49700 81.5 70.87
26 * -350.712 (variable) 70.01
27 -1977.439 1.40 1.88300 40.8 42.39
28 66.155 3.83 1.80518 25.4 40.76
29 160.692 (variable) 40.14
30 (Aperture) ∞ 5.00 28.95
31 -49.799 1.61 1.88300 40.8 27.73
32 67.783 3.97 1.80809 22.8 28.09
33 -233.634 3.39 28.27
34 -311.621 1.80 1.88300 40.8 28.49
35 -1606.059 5.95 28.65
36 -460.342 1.50 1.72916 54.7 29.40
37 47.361 2.77 1.80518 25.4 29.82
38 118.931 2.21 29.90
39 41.428 14.20 1.62041 60.3 31.36
40 919.972 5.51 30.06
41 760.857 4.00 1.51823 58.9 29.13
42 -180.314 0.45 28.73
43 220.062 1.50 1.83400 37.2 28.32
44 28.125 7.80 1.51633 64.1 27.37
45 -69.112 1.15 27.30
46 112.637 5.52 1.48749 70.2 26.49
47 -27.522 1.50 1.83400 37.2 26.14
48 -51.627 0.25 26.19
49 292.717 3.30 1.48749 70.2 25.24
50 -120.000 5.00 24.48
51 ∞ 33.00 1.60859 46.4 50.00
52 ∞ 13.20 1.51633 64.2 50.00
53 ∞ 7.10 50.00
Image plane ∞

Aspheric data 11th surface
K = 4.94607e + 001 A 4 = 1.75621e-006 A 6 = 3.14737e-010 A 8 = 4.20809e-013 A10 = -1.79283e-016 A12 = 5.46452e-019

18th page
K = 0.00000e + 000 A 4 = -1.12015e-007 A 6 = 4.37353e-011 A 8 = -8.02595e-014 A10 = 5.27808e-017 A12 = -1.34952e-020

26th page
K = 0.00000e + 000 A 4 = 7.55305e-007 A 6 = 6.54718e-011 A 8 = -1.11234e-013 A10 = 1.28238e-016 A12 = -5.03422e-020

Various data Zoom ratio 95.00
Wide angle Medium telephoto focal length 8.80 14.90 836.00
F number 1.76 1.76 4.30
Half angle of view 32.01 20.26 0.38
Image height 5.50 5.50 5.50
Total lens length 613.64 613.64 613.64
BF 7.10 7.10 7.10

d10 2.36 39.25 189.62
d17 278.18 223.50 10.21
d26 7.29 2.67 56.81
d29 3.45 25.86 34.64

Entrance pupil position 128.73 199.74 13047.77
Exit pupil position -1378.45 -1378.45 -1378.45
Front principal point position 137.47 214.47 13379.35
Rear principal point position -1.70 -7.80 -828.90

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 250.00 116.06 66.62 -17.97
2 11 -26.50 22.59 4.67 -11.12
3 18 66.00 46.80 11.70 -21.42
4 27 -150.00 5.23 2.29 -0.55
6 30 53.05 124.58 51.08 -9.05

Single lens Data lens Start surface Focal length
1 1 -430.04
2 3 606.23
3 5 747.95
4 7 552.55
5 9 743.58
6 11 -51.90
7 13 -48.65
8 15 47.82
9 16 -60.64
10 18 140.80
11 20 152.79
12 22 227.22
13 23 -168.15
14 25 238.92
15 27 -72.05
16 28 135.91
17 31 -32.12
18 32 64.74
19 34 -435.62
20 36 -58.56
21 37 95.19
22 39 69.22
23 41 280.56
24 43 -38.56
25 44 39.66
26 46 45.81
27 47 -72.28
28 49 174.45
29 51 0.00
30 52 0.00


(Numerical example 5)
Unit mm

Surface data surface number rd nd vd Effective diameter
1 5389.599 6.00 1.83400 37.2 206.62
2 361.847 2.00 199.32
3 371.219 22.50 1.43387 95.1 198.99
4 -824.917 25.00 198.07
5 384.494 22.00 1.43387 95.1 201.42
6 -840.051 0.10 201.19
7 239.168 19.30 1.43387 95.1 194.65
8 1354.723 0.80 193.75
9 182.211 14.20 1.49700 81.5 181.57
10 316.878 (variable) 179.37
11 * 4468.630 2.20 2.00330 28.3 48.67
12 48.651 10.60 42.41
13 -48.458 1.45 1.81600 46.6 41.45
14 115.133 1.44 41.64
15 159.618 6.10 0.00000 17.5 41.97
16 -81.107 1.80 1.69680 55.5 42.06
17 1798.708 (variable) 41.90
18 * 76.477 12.72 1.49700 81.5 72.04
19 -454.467 0.10 72.01
20 127.594 9.84 1.49700 81.5 71.35
21 -253.173 0.20 70.77
22 163.129 9.22 1.49700 81.5 67.35
23 -170.226 2.20 1.84666 23.8 66.10
24 450.089 0.50 63.99
25 138.796 6.08 1.49700 81.5 62.59
26 * -240.519 (variable) 61.65
27 812.833 1.40 1.88300 40.8 33.87
28 64.475 3.83 1.80518 25.4 32.70
29 164.979 (variable) 31.84
30 (Aperture) ∞ 5.00 22.34
31 -44.387 1.61 1.88300 40.8 20.55
32 41.659 3.97 1.80809 22.8 20.49
33 -76.555 3.39 20.51
34 -55.823 1.80 1.88300 40.8 19.83
35 244.069 5.95 20.01
36 -107.382 1.50 1.72916 54.7 20.98
37 91.660 2.77 1.80518 25.4 21.49
38 561.887 2.21 21.87
39 249.183 14.20 1.62041 60.3 22.69
40 -212.154 5.51 25.07
41 107.903 5.23 1.51823 58.9 26.49
42 -43.463 0.45 26.61
43 -1277.583 1.50 1.83400 37.2 26.33
44 32.518 5.78 1.51633 64.1 26.26
45 -81.234 1.15 26.58
46 217.095 5.52 1.48749 70.2 26.81
47 -32.435 1.50 1.83400 37.2 26.85
48 -56.086 0.25 27.35
49 75.787 4.34 1.48749 70.2 27.09
50 -120.000 5.00 26.68
51 ∞ 33.00 1.60859 46.4 50.00
52 ∞ 13.20 1.51633 64.2 50.00
53 ∞ 7.00 50.00
Image plane ∞

Aspheric data 11th surface
K = 1.39027e + 001 A 4 = 7.68209e-007 A 6 = 1.68981e-010 A 8 = -8.65620e-013 A10 = 1.63113e-015 A12 = -9.37172e-019

18th page
K = 0.00000e + 000 A 4 = 1.60433e-008 A 6 = 7.61094e-011 A 8 = -5.40381e-014 A10 = 4.34443e-017 A12 = -1.42954e-020

26th page
K = 0.00000e + 000 A 4 = 1.43192e-006 A 6 = 2.24400e-010 A 8 = -2.54087e-013 A10 = 3.43003e-016 A12 = -9.78251e-020

Various data Zoom ratio 85.00
Wide angle Medium telephoto focal length 8.30 10.63 705.50
F number 1.84 1.84 3.60
Half angle of view 33.53 27.37 0.45
Image height 5.50 5.50 5.50
Total lens length 596.12 596.12 596.12
BF 7.00 7.00 7.00

d10 1.40 22.95 185.62
d17 266.96 241.00 8.35
d26 10.22 7.24 57.60
d29 4.13 11.52 31.13

Entrance pupil position 125.45 163.12 11176.86
Exit pupil position 125.52 125.52 125.52
Front principal point position 134.33 174.70 16082.05
Rear principal point position -1.30 -3.63 -698.50

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 250.00 111.90 63.30 -19.05
2 11 -26.50 23.59 4.55 -13.04
3 18 60.00 40.86 10.00 -18.79
4 27 -200.00 5.23 2.99 0.13
5 30 32.07 124.83 43.36 2.26

Single lens Data lens Start surface Focal length
1 1 -462.40
2 3 591.96
3 5 609.74
4 7 664.27
5 9 831.01
6 11 -48.63
7 13 -41.42
8 15 56.04
9 16 -110.86
10 18 132.38
11 20 171.68
12 22 168.67
13 23 -144.22
14 25 177.51
15 27 -78.92
16 28 128.05
17 31 -23.99
18 32 33.55
19 34 -51.01
20 36 -67.31
21 37 134.43
22 39 186.17
23 41 60.26
24 43 -37.76
25 44 45.60
26 46 58.11
27 47 -94.37
28 49 95.66
29 51 0.00
30 52 0.00


(Numerical example 6)
Unit mm

Surface data surface number rd nd vd Effective diameter
1 10527.308 6.00 1.83400 37.2 190.00
2 339.773 2.00 189.84
3 339.926 22.00 1.43387 95.1 190.93
4 -1180.999 25.02 191.62
5 689.949 20.00 1.43387 95.1 197.05
6 -513.721 0.10 197.10
7 303.314 17.00 1.43387 95.1 193.35
8 2541.317 2.91 192.44
9 164.205 21.00 1.49700 81.5 180.99
10 474.005 (variable) 179.36
11 * 6450.063 2.20 2.00330 28.3 46.69
12 49.658 10.00 41.39
13 -50.012 1.45 1.81600 46.6 40.57
14 150.627 7.70 0.00000 17.5 41.05
15 -78.157 2.00 41.84
16 -66.478 2.00 1.69680 55.5 42.11
17 -1326.160 (variable) 44.11
18 88.190 17.00 1.49700 81.5 80.63
19 * -155.078 0.10 80.73
20 91.159 13.00 1.43875 94.9 79.20
21 -1604.215 0.10 77.93
22 148.806 2.00 1.80809 22.8 74.93
23 74.192 15.00 1.43875 94.9 71.48
24 -606.627 0.50 69.52
25 194.059 5.48 1.43875 94.9 66.63
26 * -2301.024 (variable) 64.67
27 916.794 1.40 1.77250 49.6 39.79
28 78.446 3.89 1.92286 18.9 38.36
29 97.437 (variable) 37.02
30 (Aperture) ∞ 5.00 23.93
31 -68.491 1.40 1.88300 40.8 22.18
32 70.623 4.67 1.92286 18.9 21.97
33 -126.307 2.00 21.74
34 -47.793 1.40 1.88300 40.8 21.36
35 75.174 8.95 21.57
36 96.263 1.50 1.72916 54.7 25.03
37 78.013 4.77 1.80518 25.4 25.21
38 -161.018 4.21 25.49
39 -32.718 1.80 1.72000 43.7 25.55
40 68.811 7.71 1.58267 46.4 27.66
41 -39.952 7.00 29.21
42 -5764.109 6.33 1.51823 58.9 31.58
43 -40.005 0.22 32.06
44 114.293 1.50 1.83400 37.2 31.62
45 28.473 9.00 1.51633 64.1 30.90
46 -124.261 2.00 31.22
47 246.939 5.00 1.48749 70.2 31.26
48 -49.974 1.50 1.85026 32.3 31.19
49 -324.249 0.20 31.56
50 67.732 6.04 1.48749 70.2 31.82
51 -59.836 8.00 31.65
52 ∞ 33.00 1.60859 46.4 50.00
53 ∞ 13.20 1.51633 64.2 50.00
54 ∞ 10.00 50.00
Image plane ∞

Aspheric data 11th surface
K = 7.23170e + 004 A 4 = 2.23679e-007 A 6 = 6.76661e-010 A 8 = -3.65222e-012 A10 = 7.85270e-015 A12 = -6.36331e-018

19th page
K = 0.00000e + 000 A 4 = 3.41580e-007 A 6 = 1.44719e-010 A 8 = -1.65687e-013 A10 = 4.58673e-017 A12 = 3.96172e-021

26th page
K = 0.00000e + 000 A 4 = 7.86282e-007 A 6 = 7.07035e-011 A 8 = -2.41514e-013 A10 = 9.53990e-016 A12 = -5.60321e-019

Various data Zoom ratio 72.00
Wide angle Medium Telephoto focal length 9.50 16.16 684.00
F number 1.82 1.82 3.60
Half angle of view 30.07 18.80 0.46
Image height 5.50 5.50 5.50
Total lens length 625.13 625.13 625.13
BF 10.00 10.00 10.00

d10 4.57 46.57 171.98
d17 264.36 212.33 6.00
d26 5.00 2.95 77.30
d29 4.96 17.04 23.61

Entrance pupil position 134.14 222.45 9950.46
Exit pupil position 130.07 130.07 130.07
Front principal point position 144.40 240.79 14530.85
Rear principal point position 0.50 -6.16 -674.00

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 238.00 116.02 69.02 -15.59
2 11 -28.00 25.35 4.85 -13.18
3 18 63.00 53.18 12.46 -26.22
4 27 -150.00 5.29 3.78 0.96
5 30 34.25 136.40 46.77 2.18

Single lens Data lens Start surface Focal length
1 1 -418.43
2 3 609.52
3 5 680.43
4 7 790.03
5 9 492.92
6 11 -49.47
7 13 -45.63
8 14 53.84
9 16 -100.08
10 18 115.47
11 20 196.57
12 22 -183.44
13 23 151.31
14 25 407.15
15 27 -110.60
16 28 392.02
17 31 -38.96
18 32 49.04
19 34 -32.72
20 36 -582.10
21 37 65.25
22 39 -30.41
23 40 44.32
24 42 77.39
25 44 -45.54
26 45 45.62
27 47 85.44
28 48 -69.15
29 50 65.98
30 52 0.00
31 53 0.00

U1 first lens group, U2 second lens group, U3 third lens group, U4 fourth lens group,
U5 5th lens group, SP: Aperture, DG glass block, IP imaging surface

Claims (6)

In order from the object side to the image side, a first lens unit having a positive refractive power that does not move during zooming, a second lens unit having a negative refractive power for zooming, and a third lens having a positive refractive power for zooming. In a zoom lens including a lens group, a fourth lens group having a negative refractive power that corrects image plane variation caused by zooming, and a fifth lens group having a positive refractive power that does not move during zooming,
The amount by which the second lens group moves in the optical axis direction from the wide-angle end to the telephoto end is M2t,
The amount by which the second lens group moves from the wide-angle end to a predetermined zoom position m is M2m,
The distance between the third lens group and the fourth lens group at the predetermined zoom position m is L3m,
The focal length of the third lens group is f3,
The focal length of the fourth lens group is f4,
The distance between the second lens group and the third lens group at the wide-angle end is L2w.
When the distance between the third lens group and the fourth lens group at the wide angle end is L3w,
0.0 <M2m / M2t <0.5
Within the scope of
L3m / L3w <1.0
The predetermined zoom position m satisfying
And,
-4.0 <f4 / f3 <-1.0
15 <L2w / L3w <200
A zoom lens characterized by satisfying the following conditions: The focal length of the first lens group is f1,
When the focal length of the second lens group is f2,
−11.0 <f1 / f2 <−8.0
The zoom lens according to claim 1, wherein the following condition is satisfied. −0.5 <f2 / f3 <−0.3
The zoom lens according to claim 1, wherein the following condition is satisfied. 0.0 <M2m / M2t <0.5
Within the range
The distance between the second lens group and the third lens group when the third lens group and the fourth lens group are closest to each other is L2 mmin,
When the distance between the third lens group and the fourth lens group when the third lens group and the fourth lens group are closest to each other is L3 mmin,
20 <L2mmin / L3mmin <1000
The zoom lens according to claim 1, wherein the following condition is satisfied.   The zoom lens according to any one of claims 1 to 4, wherein the fourth lens group includes at least one negative lens and one positive lens.   An image pickup apparatus comprising: the zoom lens according to claim 1; and a solid-state image pickup device that receives an image formed by the zoom lens.