WO2012081602A1

WO2012081602A1 - Variable power optical system, optical device comprising the variable power optical system, and method for producing variable power optical system

Info

Publication number: WO2012081602A1
Application number: PCT/JP2011/078870
Authority: WO
Inventors: 智希伊藤
Original assignee: 株式会社ニコン
Priority date: 2010-12-15
Filing date: 2011-12-14
Publication date: 2012-06-21

Abstract

A variable power optical system (ZL), which is mounted in an optical device such as a single-lens reflex camera (1), comprises sequentially from the object side, a first lens group (G1) that has a positive refractive power, a second lens group (G2) that has a negative refractive power, a third lens group (G3) that has a positive refractive power, a fourth lens group (G4) that has a negative refractive power, a fifth lens group (G5) that has a positive refractive power and sixth lens group (G6) that has a negative refractive power. The variable power optical system (ZL) is configured such that at least some lenses in one lens group among the first to sixth lens groups (G1-G6) move so as to contain a component in the direction that is perpendicular to the optical axis. Consequently, there are provided: a variable power optical system wherein aberration fluctuation at the time when the power is varied is well suppressed; an optical device which comprises the variable power system; and a method for producing a variable power optical system.

Description

Variable magnification optical system, optical apparatus having the variable magnification optical system, and method of manufacturing the variable magnification optical system

The present invention relates to a variable magnification optical system, an optical apparatus having the variable magnification optical system, and a method for manufacturing the variable magnification optical system.

Conventionally, a variable power optical system suitable for a photographic camera, an electronic still camera, a video camera, and the like has been proposed (see, for example, JP-A-11-223770).

However, the conventional variable power optical system has a problem that the aberration fluctuation during zooming is large.

The present invention has been made in view of such problems, and provides a variable power optical system that satisfactorily suppress aberration fluctuations during variable power, an optical apparatus having the variable power system, and a method of manufacturing the variable power optical system. The purpose is to provide.

In order to solve the above-described problem, the first aspect of the present invention is configured in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive refractive power. A third lens group, a fourth lens group having a negative refractive power, a fifth lens group having a positive refractive power, and a sixth lens group having a negative refractive power, and these lenses The lens unit moves so that at least a part of any one lens group includes a component in a direction orthogonal to the optical axis. In this zoom optical system, the focal length of the first lens group is f1, the focal length of the third lens group is f3, the focal length of the fourth lens group is f4, and the focal length of the fifth lens group is Provided is a variable magnification optical system characterized by satisfying the following conditional expressions (1) and (2) when f5 is satisfied.
1.62 <f1 / f3 <2.23 (1)
1.71 <(− f4) / f5 <2.99 (2)

Also, a second aspect of the present invention provides an optical apparatus characterized by having a variable magnification optical system according to the first aspect of the present invention.

Further, according to a third aspect of the present invention, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power, A fourth lens group having negative refracting power, a fifth lens group having positive refracting power, and a sixth lens group having negative refracting power. The optical axis is fixed with respect to the image plane. In this zoom optical system, when the focal length of the first lens group is f1, the focal length of the second lens group is f2, and the focal length of the third lens group is f3, the following conditional expression (5 ) And (6) are satisfied, and a variable magnification optical system is provided.
3.10 <f1 / (− f2) <5.00 (5)
0.40 <(− f2) / f3 <0.60 (6)

Also, a fourth aspect of the present invention provides an optical apparatus characterized by having the variable magnification optical system according to the third aspect of the present invention.

According to a fifth aspect of the present invention, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power; A method of manufacturing a variable magnification optical system having a fourth lens group having a negative refractive power, a fifth lens group having a positive refractive power, and a sixth lens group having a negative refractive power, Among these lens groups, at least a part of any one of the lens groups is movably disposed so as to include a component in a direction orthogonal to the optical axis, and the focal length of the first lens group is f1, and the third lens When the focal length of the group is f3, the focal length of the fourth lens group is f4, and the focal length of the fifth lens group is f5, they are arranged so as to satisfy the following conditional expressions (1) and (2). A variable magnification optical system manufacturing method is provided.
1.62 <f1 / f3 <2.23 (1)
1.71 <(− f4) / f5 <2.99 (2)

According to a sixth aspect of the present invention, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power; A method of manufacturing a variable magnification optical system having a fourth lens group having a negative refractive power, a fifth lens group having a positive refractive power, and a sixth lens group having a negative refractive power, At the time of zooming, the first lens unit is disposed so as to be fixed in the optical axis direction with respect to the image plane, the focal length of the first lens unit is f1, the focal length of the second lens unit is f2, Provided is a variable magnification optical system manufacturing method characterized by disposing the three lens groups so as to satisfy the following conditional expressions (5) and (6) when the focal length of the three lens groups is f3.
3.10 <f1 / (− f2) <5.00 (5)
0.40 <(− f2) / f3 <0.60 (6)

According to the present invention, it is possible to provide a variable magnification optical system that satisfactorily suppress aberration fluctuations during variable magnification, an optical apparatus having the variable magnification optical system, and a method for manufacturing the variable magnification optical system.

FIG. 1 is a cross-sectional view showing a lens configuration of a variable magnification optical system according to the first example. 2A and 2B are graphs showing various aberrations in the wide-angle end state of the variable magnification optical system according to the first example. FIG. 2A shows the state at the infinite focus, and FIG. 2B shows 0.3 ° in the infinite focus state. The coma aberration figure when performing the rotational shake correction of is shown. FIGS. 3A and 3B are graphs showing various aberrations in the intermediate focal length state of the variable magnification optical system according to the first example. FIG. 3A shows the infinite focus state, and FIG. A coma aberration diagram when 2o rotational blur correction is performed is shown. FIGS. 4A and 4B are graphs showing various aberrations in the telephoto end state of the variable magnification optical system according to the first example. FIG. 4A shows an infinite focus state, and FIG. 4B shows 0.2 ° in an infinite focus state. The coma aberration figure when performing the rotational shake correction of is shown. FIG. 5 is a cross-sectional view showing a lens configuration of a variable magnification optical system according to the second example. FIGS. 6A and 6B are graphs showing various aberrations in the wide-angle end state of the variable magnification optical system according to the second example. FIG. 6A shows the infinite focus state, and FIG. 6B shows 0.3 o in the infinite focus state. The coma aberration figure when performing the rotational shake correction of is shown. FIGS. 7A and 7B are graphs showing various aberrations in the intermediate focal length state of the variable magnification optical system according to the second example. FIG. 7A shows the infinite focus state, and FIG. A coma aberration diagram when 2o rotational blur correction is performed is shown. FIGS. 8A and 8B are graphs showing various aberrations in the telephoto end state of the variable magnification optical system according to the second example. FIG. 8A shows the infinite focus state, and FIG. 8B shows the 0.2 ° in the infinite focus state. The coma aberration figure when performing the rotational shake correction of is shown. FIG. 9 is a cross-sectional view showing a lens configuration of a variable magnification optical system according to the third example. FIGS. 10A and 10B are graphs showing various aberrations in the wide-angle end state of the variable magnification optical system according to the third example. FIG. 10A shows the infinite focus state, and FIG. 10B shows 0.3 ° in the infinite focus state. The coma aberration figure when performing the rotational shake correction of is shown. 11A and 11B are graphs showing various aberrations in the intermediate focal length state of the variable magnification optical system according to the third example. FIG. 11A shows the infinite focus state, and FIG. A coma aberration diagram when 2o rotational blur correction is performed is shown. 12A and 12B are graphs showing various aberrations in the telephoto end state of the variable magnification optical system according to the third example. FIG. 12A shows the infinite focus state, and FIG. 12B shows 0.2 ° in the infinite focus state. The coma aberration figure when performing the rotational shake correction of is shown. FIG. 13 is a cross-sectional view of a single-lens reflex camera equipped with a variable magnification optical system according to this embodiment. FIG. 14 is a flowchart showing an outline of a method for manufacturing a variable magnification optical system according to the present embodiment. FIG. 15 is a flowchart showing an outline of a method for manufacturing a variable magnification optical system viewed from another viewpoint according to the present embodiment.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the variable magnification optical system ZL according to the present embodiment includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, A third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, a fifth lens group G5 having a positive refractive power, and a sixth lens group G6 having a negative refractive power And have. The variable magnification optical system ZL moves at least a part of any one of the first to sixth lens groups G1 to G6 so as to include a component in a direction orthogonal to the optical axis. It is configured to function as an anti-vibration lens group that displaces an image. By moving at least a part of any one of the first to sixth lens groups G1 to G6, the moving mechanism can be reduced in size.

In addition, the zoom optical system ZL has a distance between the first to sixth lens groups G1 to G6 (a distance between the first lens group G1 and the second lens group G2, a second lens group G2 and the like) during zooming. The distance between the third lens group G3, the distance between the third lens group G3 and the fourth lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, and the fifth lens group G5 and the sixth lens group. The distance between G6 and the G6 is changed. Further, by changing the distance between the lens groups, it is possible to reduce the fluctuation of spherical aberration and the fluctuation of field curvature during zooming.

In the zoom optical system ZL, the first lens group G1 is fixed in the optical axis direction with respect to the image plane during zooming. By fixing the first lens group G1 in the optical axis direction with respect to the image plane, it is possible to simplify the drive mechanism for zooming, thereby reducing the size of the lens barrel.

Now, conditions for configuring the variable magnification optical system ZL according to the present embodiment will be described. First, the variable magnification optical system ZL according to the present embodiment satisfies the following conditional expression (1) when the focal length of the first lens group G1 is f1 and the focal length of the third lens group G3 is f3. It is characterized by that.
1.62 <f1 / f3 <2.23 (1)

Conditional expression (1) defines an appropriate focal length of the first lens group G1 with respect to the focal length of the third lens group G3. By satisfying conditional expression (1), spherical aberration and chromatic aberration at the telephoto end can be corrected well. If the value of f1 / f3 is less than the lower limit value of the conditional expression (1), the refractive power of the first lens group G1 increases, which makes it difficult to correct spherical aberration and chromatic aberration at the telephoto end. In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (1) to 1.70. On the other hand, if the value of f1 / f3 exceeds the upper limit value of the conditional expression (1), the refractive power of the first lens group G1 becomes small, leading to an increase in the total length. In addition, the refractive power of the third lens group G3 increases, and it becomes difficult to correct spherical aberration at the telephoto end, which is not preferable. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (1) to 2.20.

Further, the variable magnification optical system ZL according to the present embodiment satisfies the following conditional expression (2) when the focal length of the fourth lens group G4 is f4 and the focal length of the fifth lens group G5 is f5. It is characterized by that.
1.71 <(− f4) / f5 <2.99 (2)

Conditional expression (2) defines an appropriate focal length of the fourth lens group G4 with respect to the focal length of the fifth lens group G5. By satisfying conditional expression (2), it is possible to satisfactorily correct the variation in spherical aberration during zooming. If the value of (−f4) / f5 is less than the lower limit value of the conditional expression (2), the refractive power of the fourth lens group G4 increases, and the occurrence of decentration coma due to manufacturing errors becomes significant, which is not preferable. In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (2) to 1.90. On the other hand, if the value of (−f4) / f5 exceeds the upper limit value of conditional expression (2), the refractive power of the fourth lens group G4 becomes small, and it becomes difficult to correct the variation of spherical aberration at the time of zooming. It is not preferable. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (2) to 2.85.

As described above, the variable magnification optical system ZL according to the present embodiment is configured to satisfy the conditional expression (1) or the conditional expression (2), so that the aberration fluctuation at the time of zooming and the aberration fluctuation at the time of image blur correction are corrected. It is possible to realize a variable magnification optical system in which the above is satisfactorily suppressed.

In the variable magnification optical system ZL according to the present embodiment, the total length in the wide-angle end state (the distance along the optical axis from the lens surface closest to the object side of the variable magnification optical system ZL to the image plane) is TLw. It is preferable that the following conditional expression (3) is satisfied.
0.30 <f1 / TLw <0.60 (3)

Conditional expression (3) defines an appropriate focal length of the first lens group G1 with respect to the optical total length of the zooming optical system ZL in the wide-angle end state. By satisfying conditional expression (3), it is possible to satisfactorily correct spherical aberration and chromatic aberration in the telephoto end state. If the value of f1 / TLw is less than the lower limit value of conditional expression (3), the refractive power of the first lens group G1 increases, and it becomes difficult to correct spherical aberration and chromatic aberration in the telephoto end state. In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (3) to 0.35. On the other hand, if the value of f1 / TLw exceeds the upper limit value of conditional expression (3), the total optical length becomes shorter than the refractive power of the first lens group G1, and it becomes difficult to correct curvature of field in the wide-angle end state. Absent. In order to secure the effect of the present embodiment, it is preferable to set the upper limit value of conditional expression (3) to 0.52.

In the zoom optical system according to this embodiment, it is preferable that the following conditional expression (4) is satisfied when the focal length of the second lens group G2 is f2.
0.08 <(− f2) / TLw <0.15 (4)

Conditional expression (4) defines an appropriate focal length of the second lens group G2 with respect to the entire optical length of the variable magnification optical system ZL in the wide-angle end state. By satisfying conditional expression (4), coma aberration in the wide-angle end state and spherical aberration in the telephoto end state can be favorably corrected. When the value of (−f2) / TLw falls below the lower limit value of the conditional expression (4), the refractive power of the second lens group G2 increases, and the coma aberration in the wide-angle end state and the spherical aberration in the telephoto end state are corrected. It becomes difficult and undesirable. In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (4) to 0.09. On the other hand, if the value of (−f2) / TLw exceeds the upper limit value of the conditional expression (4), the refractive power of the second lens group G2 becomes small, and the diameter of the first lens group G1 becomes large. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (4) to 0.14.

In addition, the variable magnification optical system ZL according to the present embodiment is provided between the third lens group G3 and the sixth lens group G6 (including being arranged between the lens group and the lens group or in the lens group). It is preferable to have an aperture stop S. With this configuration, coma and curvature of field can be favorably corrected.

In the variable magnification optical system ZL according to the present embodiment, it is preferable that at least a part of the third lens group G3 moves along the optical axis during focusing. Furthermore, it is more preferable that all the lenses of the third lens group G3 move toward the object side along the optical axis during focusing. With this configuration, rapid focusing can be performed, and fluctuations in spherical aberration during focusing can be reduced.

Hereinafter, an outline of a manufacturing method of the variable magnification optical system ZL of the present embodiment will be described with reference to FIG. First, each lens is arranged and a lens group is prepared (step S100). Specifically, in the present embodiment, for example, as illustrated in FIG. 1, in order from the object side, a negative negative meniscus lens L11 having a convex surface facing the object side and a biconvex lens L12 are joined, and the convex surface is directed to the object side. The positive meniscus lens L13 and the positive meniscus lens L14 having a convex surface facing the object side are arranged as a first lens group G1, and in order from the object side, a negative meniscus lens L21 having a convex surface facing the object side, a biconcave lens L22, A cemented positive lens with a biconvex lens L23 and a biconcave lens L24 are arranged to form a second lens group G2, and in order from the object side, a biconvex lens L31, a biconvex lens L32, and a negative meniscus lens L33 with a concave surface facing the object side Are arranged as a third lens group G3, and a negative meniscus lens L41 having a concave surface facing the object side is arranged as a fourth lens group G4. In order from the object side, an aperture stop S, a positive meniscus lens L51 having a convex surface facing the object side, and a cemented positive lens of a biconvex lens L52 and a negative meniscus lens L53 having a concave surface facing the object side are arranged as a fifth lens. In order from the object side, a cemented positive lens made up of a biconcave lens L61 and a biconvex lens L62, and a negative meniscus lens L63 having a concave surface facing the object side are arranged in order from the object side to form a sixth lens group G6.

At this time, at least a part of any one of the first to sixth lens groups (a part of the fifth lens group G5 in the case of FIG. 1) has a component in a direction perpendicular to the optical axis. It arrange | positions so that a movement is included (step S200).

In these lens groups G1 to G6, the focal length of the first lens group is f1, the focal length of the third lens group is f3, the focal length of the fourth lens group is f4, and the focal length of the fifth lens group. When the distance is set to f5, it arrange | positions so that the above-mentioned conditional expression (1) and (2) may be satisfied (step S300).

Next, the variable magnification optical system ZL viewed from another viewpoint according to this embodiment includes, in order from the object side, a first lens group G1 having a positive refractive power and a second lens group G2 having a negative refractive power. A third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, a fifth lens group G5 having a positive refractive power, and a sixth lens having a negative refractive power And Group G6. Further, in the variable magnification optical system ZL viewed from another viewpoint according to the present embodiment, the first lens group G1 is fixed in the optical axis direction with respect to the image plane during the variable magnification. By fixing the first lens group G1 in the optical axis direction with respect to the image plane, it is possible to simplify the drive mechanism for zooming, thereby reducing the size of the lens barrel.

Further, the variable magnification optical system ZL viewed from another point of view according to the present embodiment has an interval between the first to sixth lens groups G1 to G6, that is, the first lens group G1 and the second lens group, at the time of zooming. The distance between G2, the distance between the second lens group G2 and the third lens group G3, the distance between the third lens group G3 and the fourth lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, and It is preferable that the distance between the fifth lens group G5 and the sixth lens group G6 changes. With this configuration, fluctuations in spherical aberration and field curvature during zooming can be reduced.

Further, in the variable magnification optical system ZL viewed from another viewpoint according to the present embodiment, at least a part of any one of the first to sixth lens groups G1 to G6 is orthogonal to the optical axis. It is configured to function as an anti-vibration lens group that displaces an image by moving it so as to have a directional component. Thus, by moving a part of the lens group, the moving mechanism can be reduced in size.

The conditions for configuring the variable magnification optical system ZL viewed from another viewpoint according to the present embodiment will now be described. First, in the variable magnification optical system ZL viewed from another viewpoint according to the present embodiment, when the focal length of the first lens group G1 is f1, and the focal length of the second lens group G2 is f2, the following conditional expression Satisfies (5).
3.10 <f1 / (− f2) <5.00 (5)

Conditional expression (5) defines an appropriate focal length of the first lens group G1 with respect to the focal length of the second lens group G2. By satisfying conditional expression (5), it is possible to satisfactorily correct spherical aberration and chromatic aberration in the telephoto end state. If the value of f1 / (− f2) is less than the lower limit value of the conditional expression (5), the refractive power of the first lens group G1 increases, and it becomes difficult to correct spherical aberration and chromatic aberration in the telephoto end state. Absent. In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (5) to 3.40. On the other hand, if the value of f1 / (− f2) exceeds the upper limit value of the conditional expression (5), the refractive power of the first lens group G1 becomes small, which leads to an increase in the total length. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (5) to 4.50.

In addition, the variable magnification optical system ZL viewed from another viewpoint according to the present embodiment satisfies the following conditional expression (6) when the focal length of the third lens group G3 is f3.
0.40 <(− f2) / f3 <0.60 (6)

Conditional expression (6) defines an appropriate focal length of the second lens group G2 with respect to the focal length of the third lens group G3. By satisfying conditional expression (6), coma aberration in the wide-angle end state and spherical aberration in the telephoto end state can be corrected well. When the value of (−f2) / f3 falls below the lower limit value of conditional expression (6), the refractive power of the second lens group G2 increases, and the coma aberration at the wide-angle end state and the spherical aberration at the telephoto end are corrected. It becomes difficult and undesirable. In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (6) to 0.42. Further, if the value of (−f2) / f3 exceeds the upper limit value of the conditional expression (6), the refractive power of the second lens group G2 decreases, and the diameter of the first lens group G1 increases, which is preferable. Absent. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (6) to 0.55.

As described above, the variable magnification optical system ZL viewed from another viewpoint according to the present embodiment is configured to satisfy the conditional expression (5) or the conditional expression (6). It is possible to realize a variable magnification optical system that satisfactorily suppress aberration fluctuations during blur correction.

Further, in the variable magnification optical system ZL viewed from another viewpoint according to the present embodiment, when the focal length of the fourth lens group G4 is f4 and the focal length of the sixth lens group G6 is f6, the following conditional expression It is preferable to satisfy (7).
2.00 <f4 / f6 <3.00 (7)

Conditional expression (7) defines an appropriate focal length of the sixth lens group G6 with respect to the focal length of the fourth lens group G4. By satisfying conditional expression (7), it is possible to satisfactorily correct the variation in spherical aberration during zooming. If the value of f4 / f6 is less than the lower limit value of conditional expression (7), the refractive power of the fourth lens group G4 increases, and the occurrence of decentration coma due to manufacturing errors becomes significant. In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (7) to 2.20. On the other hand, if the value of f4 / f6 exceeds the upper limit value of the conditional expression (7), the refractive power of the fourth lens group G4 becomes small, which makes it difficult to correct the variation of spherical aberration during zooming, which is not preferable. . In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (7) to 2.80.

Further, in the variable magnification optical system ZL viewed from another viewpoint according to the present embodiment, when the focal length of the fifth lens group G5 is f5 and the focal length of the sixth lens group G6 is f6, the following conditional expression It is preferable to satisfy (8).
0.66 <f5 / (− f6) <1.50 (8)

Conditional expression (8) defines an appropriate focal length of the fifth lens group G5 with respect to the focal length of the sixth lens group G6. By satisfying conditional expression (8), it is possible to satisfactorily correct the variation in field curvature at the time of zooming. If the value of f5 / (− f6) is less than the lower limit value of conditional expression (8), the refractive power of the fifth lens group G5 increases, and it becomes difficult to correct curvature of field and astigmatism in the wide-angle end state. It is not preferable. In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (8) to 0.80. Further, when the value of f5 / (− f6) exceeds the upper limit value of the conditional expression (8), the refractive power of the fifth lens group G5 becomes small, and the fluctuation of the field curvature at the time of zooming can be corrected. It becomes difficult and undesirable. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (8) to 1.30.

In addition, the variable magnification optical system ZL viewed from another viewpoint according to the present embodiment is disposed between the third lens group G3 and the sixth lens group G6 (between the lens group and the lens group or in the lens group). It is preferable to have an aperture stop S. With this configuration, coma and curvature of field can be favorably corrected.

Further, in the variable magnification optical system ZL viewed from another viewpoint according to the present embodiment, it is preferable that at least a part of the third lens group G3 moves along the optical axis during focusing. Furthermore, it is more preferable that all the lenses of the third lens group G3 move toward the object side along the optical axis during focusing. With this configuration, rapid focusing can be performed, and fluctuations in spherical aberration during focusing can be reduced.

Hereinafter, an outline of a manufacturing method of the variable magnification optical system ZL viewed from another viewpoint according to the present embodiment will be described with reference to FIG. First, each lens is arranged and a lens group is prepared (step S400). Specifically, in the present embodiment, for example, as illustrated in FIG. 1, in order from the object side, a negative negative meniscus lens L11 having a convex surface facing the object side and a biconvex lens L12 are joined, and the convex surface is directed to the object side. The positive meniscus lens L13 and the positive meniscus lens L14 having a convex surface facing the object side are arranged as a first lens group G1, and in order from the object side, a negative meniscus lens L21 having a convex surface facing the object side, a biconcave lens L22, A cemented positive lens with a biconvex lens L23 and a biconcave lens L24 are arranged to form a second lens group G2, and in order from the object side, a biconvex lens L31, a biconvex lens L32, and a negative meniscus lens L33 with a concave surface facing the object side Are arranged as a third lens group G3, and a negative meniscus lens L41 having a concave surface facing the object side is arranged as a fourth lens group G4. In order from the object side, an aperture stop S, a positive meniscus lens L51 having a convex surface facing the object side, and a cemented positive lens of a biconvex lens L52 and a negative meniscus lens L53 having a concave surface facing the object side are arranged as a fifth lens. In order from the object side, a cemented positive lens made up of a biconcave lens L61 and a biconvex lens L62, and a negative meniscus lens L63 having a concave surface facing the object side are arranged in order from the object side to form a sixth lens group G6.

At this time, the first lens group G1 is arranged so as to be fixed in the optical axis direction with respect to the image plane (step S500).

When these lens groups G1 to G6 have the focal length of the first lens group G1 as f1, the focal length of the second lens group G2 as f2, and the focal length of the third lens group G3 as f3. (5) and (6) are satisfied (step S600).

(Example)
Hereinafter, each example of the present application will be described with reference to the drawings. 1, FIG. 5, and FIG. 9 are sectional views showing the configuration of the variable magnification optical system ZL (ZL1 to ZL3) according to each example. Each of these variable magnification optical systems ZL1 to ZL3 has, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a positive refractive power. A third lens group G3 having a negative refractive power, a fifth lens group G5 having a positive refractive power, and a sixth lens group G6 having a negative refractive power. ing.

Further, in the lower part of the sectional views of these zoom optical systems ZL1 to ZL3, along the optical axis of each lens group G1 to G6 when zooming from the wide-angle end state (W) to the telephoto end state (T) The direction of movement is indicated by an arrow. Specifically, the axial air gap between the first lens group G1 and the second lens group G2 increases, the axial air gap between the second lens group G2 and the third lens group G3 changes, and the third lens. The axial air gap between the group G3 and the fourth lens group G4 changes, the axial air gap between the fourth lens group G4 and the fifth lens group G5 decreases, and the fifth lens group G5 and the sixth lens group G6. The first lens group G1 is fixed in the optical axis direction with respect to the image plane, the second lens group G2 moves toward the image plane side, and the third lens group G3 is temporarily moved. After moving to the image plane side, it moves to the object side, the fourth lens group G4 once moves to the image plane side, then moves to the object side, the fifth lens group G5 moves to the object side, and the sixth lens group G6. Moves to the object side.

Further, in these variable magnification optical systems ZL1 to ZL3, the third lens group G3 moves along the optical axis from the object side to the image plane side when focusing on the closest object from infinity. In the variable magnification optical systems ZL1 and ZL2 according to the first and second examples, a part of the fifth lens group G5 moves so as to include a component in a direction orthogonal to the optical axis as an anti-vibration lens group. In the variable magnification optical system ZL3 according to the third example, a part of the sixth lens group G6 moves so as to include a component in a direction orthogonal to the optical axis as an anti-vibration lens group.

<First embodiment>
FIG. 1 is a diagram showing a configuration of a variable magnification optical system ZL1 according to the first example of the present application. In the variable magnification optical system ZL1 of FIG. 1, the first lens group G1 has, in order from the object side, a cemented negative lens of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex lens L12, and a convex surface facing the object side. It is composed of a positive meniscus lens L13 and a positive meniscus lens L14 having a convex surface facing the object side. The second lens group G2 includes, in order from the object side, a negative meniscus lens L21 having a convex surface directed toward the object side, a cemented positive lens of a biconcave lens L22 and a biconvex lens L23, and a biconcave lens L24. The third lens group G3 includes, in order from the object side, a biconvex lens L31, and a cemented negative lens of a biconvex lens L32 and a negative meniscus lens L33 having a concave surface facing the object side. The fourth lens group G4 includes a negative meniscus lens L41 having a concave surface directed toward the object side. The fifth lens group G5 includes, in order from the object side, an aperture stop S, a positive meniscus lens L51 having a convex surface facing the object side, and a cemented positive lens of a biconvex lens L52 and a negative meniscus lens L53 having a concave surface facing the object side. It is configured. The sixth lens group G6 includes, in order from the object side, a cemented positive lens made up of a biconcave lens L61 and a biconvex lens L62, and a negative meniscus lens L63 with a concave surface facing the object side.

Table 1 below lists the values of the specifications of the first embodiment. In Table 1, (total specifications) are the focal length f, the F number FNO, the angle of view 2ω, the image height in each of the wide-angle end state (W), the intermediate focal length state (M), and the telephoto end state (T). Y and full length TL are shown respectively. Further, in (lens data), the first column m indicates the order (surface number) of the lens surfaces from the object side along the traveling direction of the light beam, the second column r indicates the curvature radius of each lens surface, The third column d indicates the distance (surface interval) on the optical axis from each optical surface to the next optical surface, and the fourth column νd and the fifth column nd indicate Abbe numbers with respect to the d-line (λ = 587.6 nm). And the refractive index. The total length TL represents the distance on the optical axis from the first surface of the lens surface to the image surface at the time of focusing on infinity. In the variable magnification optical system ZL1, the focal length of the entire system is f, and the image movement amount on the imaging surface with respect to the image stabilization coefficient, that is, the amount of movement of the moving lens group (anti-vibration lens group) in shake correction. In order to correct rotational shake at an angle θ with a lens having a ratio of K, the image stabilization lens group for shake correction may be moved in the direction orthogonal to the optical axis by (f · tan θ) / K. The same applies to the examples). Further, (anti-shake correction data) includes the focal length f in the wide-angle end state (M), the intermediate focal length state (M), and the telephoto end state (T) of the variable magnification optical system ZL1 according to the first example. The vibration coefficient K, the rotational shake θ (unit: degree), and the vibration-proof lens group movement amount Dvr (unit: mm) are shown. Further, (lens group data) indicates the start surface ST and the focal length of each of the first to sixth lens groups G1 to G6. Here, the focal length f, the radius of curvature r, the surface interval d, and other length units listed in all the following specification values are generally “mm”, but the optical system is proportionally enlarged or proportional. Since the same optical performance can be obtained even if the image is reduced, the present invention is not limited to this. A radius of curvature of 0.00 indicates a plane in the case of a lens surface, and indicates an aperture or a diaphragm surface in the case of a stop. Further, the refractive index of air of 1.0000 is omitted. The description of these symbols and the description of the specification table are the same in the following examples.

(Table 1)
(Overall specifications)
W M T
f = 81.6 240.0 392.0
FNO = 4.59 5.00 5.77
2ω = 29.4 9.9 6.1
Y = 21.6 21.6 21.6
TL = 272.2 272.2 272.2
(Lens data)
m r d νd nd
1 296.532 2.500 32.35 1.85026
2 99.157 7.768 82.51 1.49782
3 -5648.049 0.100
4 107.361 6.853 82.51 1.49782
5 1442.619 0.100
6 87.207 7.958 82.51 1.49782
7 1442.621 D1
8 1295.063 2.000 46.62 1.81600
9 43.784 5.132
10 -72.122 2.000 65.46 1.60300
11 40.058 6.018 23.78 1.84666
12 -127.005 1.379
13 -58.482 2.000 42.72 1.83481
14 184.347 D2
15 110.569 5.196 53.87 1.71300
16 -65.335 0.200
17 280.819 6.998 82.51 1.49782
18 -46.060 1.800 29.37 1.95000
19 -129.313 D3
20 -80.102 2.000 60.09 1.64000
21 -422.530 D4
22 0.000 2.000 Aperture stop S
23 44.633 3.987 82.51 1.49782
24 224.471 13.809
25 71.214 5.405 52.30 1.51742
26 -74.260 1.500 23.78 1.84666
27 -191.536 D5
28 -997.616 1.500 40.76 1.88300
29 24.061 7.006 33.80 1.64769
30 -45.482 1.665
31 -29.745 1.500 46.62 1.81600
32 -102.450 BF
(Lens group data)
Lens group ST Focal length G1 1 111.246
G2 8 -28.407
G3 15 60.186
G4 20 -154.790
G5 22 66.241
G6 28 -63.117
(Variable interval data)
W M T
D1 12.385 45.589 51.052
D2 42.241 16.728 2.000
D3 8.980 19.588 17.980
D4 39.432 11.781 2.000
D5 18.379 18.556 19.067
BF 52.4 61.6 81.7
(Image stabilization data)
f K θ Dvr
Wide-angle end W 81.6 0.76 0.3 0.56
Intermediate focal length M 240.0 0.86 0.2 0.98
Telephoto end T 392.0 1.07 0.2 1.28
(Conditional value)
(1) f1 / f3 = 1.85
(2) (-f4) /f5=2.34
(3) f1 / TLw = 0.41
(4) f2 / TLw = 0.10
(5) f1 / (-f2) = 3.92
(6) (-f2) /f3=0.47
(7) f4 / f6 = 2.45
(8) f5 / (-f6) = 1.05

2A and 2B are graphs showing various aberrations in the wide-angle end state of the variable magnification optical system according to the first example. FIG. 2A shows the state at the infinite focus, and FIG. 2B shows 0.3 ° in the infinite focus state. The coma aberration figure when performing the rotational shake correction of is shown. FIGS. 3A and 3B are graphs showing various aberrations in the intermediate focal length state of the variable magnification optical system according to the first example. FIG. 3A shows the infinite focus state, and FIG. A coma aberration diagram when 2o rotational blur correction is performed is shown. FIGS. 4A and 4B are graphs showing various aberrations in the telephoto end state of the variable magnification optical system according to the first example. FIG. 4A shows an infinite focus state, and FIG. 4B shows 0.2 ° in an infinite focus state. The coma aberration figure when performing the rotational shake correction of is shown. In each aberration diagram, FNO represents an F number, A represents a half field angle, d represents a d-line (λ = 587.6 nm), and g represents a g-line (λ = 435.6 nm). In the aberration diagram showing astigmatism, the solid line indicates the sagittal image plane, and the broken line indicates the meridional image plane. The description of these aberration diagrams is the same in the following examples. As is apparent from each aberration diagram, it is clear that in the first example, various aberrations are satisfactorily corrected and the imaging performance is excellent.

<Second embodiment>
FIG. 5 is a diagram showing a configuration of the variable magnification optical system ZL2 according to the second example of the present application. In the variable magnification optical system ZL2 of FIG. 5, the first lens group G1 includes, in order from the object side, a cemented negative lens of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex lens L12, and a convex surface facing the object side. And a positive meniscus lens L14 having a convex surface facing the object side. The second lens group G2, in order from the object side, is a cemented negative lens composed of a biconvex lens L21 and a biconcave lens L22, a cemented negative lens composed of a biconcave lens L23 and a positive meniscus lens L24 having a convex surface facing the object, and a biconcave lens L25. It is composed of The third lens group G3 includes, in order from the object side, a biconvex lens L31, and a cemented positive lens formed by a biconvex lens L32 and a negative meniscus lens L33 having a concave surface facing the object side. The fourth lens group G4 includes a negative meniscus lens L41 having a concave surface directed toward the object side. The fifth lens group G5 includes, in order from the object side, an aperture stop S, a positive meniscus lens L51 having a convex surface facing the object side, and a cemented positive lens of a biconvex lens L52 and a negative meniscus lens L53 having a concave surface facing the object side. Composed. The sixth lens group G6 includes, in order from the object side, a cemented positive lens formed by a negative meniscus lens L61 having a convex surface facing the object side and a biconvex lens L62, and a negative meniscus lens L63 having a concave surface facing the object side. .

Table 2 below lists the values of the specifications of the second embodiment.

(Table 2)
(Overall specifications)
W M T
f = 81.6 240.0 392.0
FNO = 4.59 4.96 5.77
2ω = 29.6 10.0 6.1
Y = 21.6 21.6 21.6
TL = 259.3 259.3 259.3
(Lens data)
m r d νd nd
1 335.544 2.500 32.35 1.85026
2 93.505 7.996 82.51 1.49782
3 -1086.225 0.100
4 96.595 7.149 82.51 1.49782
5 2728.493 0.100
6 88.859 7.036 82.51 1.49782
7 1101.814 D1
8 1028.718 3.605 23.78 1.84666
9 -72.545 2.000 63.37 1.61800
10 54.820 2.862
11 -227.525 2.000 54.66 1.72916
12 40.357 3.253 22.79 1.80809
13 150.185 2.893
14 -53.892 2.000 42.72 1.83481
15 136.842 D2
16 141.465 4.145 54.66 1.72916
17 -67.855 0.200
18 128.206 4.357 82.51 1.49782
19 -60.471 2.000 25.45 2.00069
20 -168.761 D3
21 -75.436 2.000 54.66 1.72916
22 -170.623 D4
23 0.000 2.000 Aperture stop
24 39.720 3.230 82.51 1.49782
25 107.621 4.538
26 84.859 4.750 52.30 1.51742
27 -54.303 2.000 28.46 1.72825
28 -156.848 D5
29 125.494 2.000 46.62 1.81600
30 20.977 4.948 36.30 1.62004
31 -39.213 2.487
32 -30.042 2.000 40.76 1.88300
33 -376.111 BF
(Lens group data)
Lens group ST Focal length G1 1 107.465
G2 8 -26.561
G3 16 57.782
G4 21 -187.102
G5 23 69.602
G6 29 -76.319
(Variable interval data)
W M T
D1 6.027 41.419 47.116
D2 38.421 16.139 2.000
D3 9.884 18.100 16.200
D4 39.081 10.416 2.000
D5 17.135 17.511 17.879
BF 64.6 71.5 89.9
(Image stabilization data)
f K θ Dvr
Wide-angle end W 81.6 0.80 0.3 0.53
Intermediate focal length M 240.0 0.87 0.2 0.98
Telephoto end T 392.0 1.05 0.2 1.30
(Values for conditional expressions)
(1) f1 / f3 = 1.86
(2) (-f4) /f5=2.69
(3) f1 / TLw = 0.42
(4) f2 / TLw = 0.10
(5) f1 / (-f2) = 4.05
(6) (-f2) /f3=0.46
(7) f4 / f6 = 2.45
(8) f5 / (-f6) = 0.91

FIGS. 6A and 6B are graphs showing various aberrations in the wide-angle end state of the variable magnification optical system according to the second example. FIG. 6A shows the infinite focus state, and FIG. 6B shows 0.3 o in the infinite focus state. The coma aberration figure when performing the rotational shake correction of is shown. FIGS. 7A and 7B are graphs showing various aberrations in the intermediate focal length state of the variable magnification optical system according to the second example. FIG. 7A shows the infinite focus state, and FIG. A coma aberration diagram when 2o rotational blur correction is performed is shown. FIGS. 8A and 8B are graphs showing various aberrations in the telephoto end state of the variable magnification optical system according to the second example. FIG. 8A shows the infinite focus state, and FIG. 8B shows the 0.2 ° in the infinite focus state. The coma aberration figure when performing the rotational shake correction of is shown. As is apparent from the respective aberration diagrams, it is clear that in the second embodiment, various aberrations are corrected well and the imaging performance is excellent.

<Third embodiment>
FIG. 9 is a diagram showing a configuration of the variable magnification optical system ZL3 according to the third example of the present application. In the variable magnification optical system ZL3 of FIG. 9, the first lens group G1 includes, in order from the object side, a cemented negative lens of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex lens L12, and a convex surface facing the object side. And a positive meniscus lens L14 having a convex surface facing the object side. The second lens group G2 includes, in order from the object side, a cemented negative lens composed of a positive meniscus lens L21 and a biconcave lens L22 having a concave surface directed toward the object side, a cemented negative lens composed of a biconvex lens L23 and a biconcave lens L24, and an object side. It is composed of a negative meniscus lens L25 having a concave surface. The third lens group G3 includes, in order from the object side, a biconvex lens L31, and a cemented negative lens of a biconvex lens L32 and a negative meniscus lens L33 having a concave surface facing the object side. The fourth lens group G4 includes a negative meniscus lens L41 having a concave surface directed toward the object side. The fifth lens group G5 includes, in order from the object side, an aperture stop S, a cemented positive lens composed of a negative meniscus lens L51 having a convex surface facing the object side and a biconvex lens L52, and a positive meniscus lens L53 having a convex surface facing the object side. It is configured. The sixth lens group G6 includes, in order from the object side, a cemented negative lens composed of a biconvex lens L61 and a biconcave lens L62, a negative meniscus lens L63 having a convex surface facing the object side, and a positive meniscus lens L64 having a convex surface facing the object side. It is composed of a cemented positive lens and a negative meniscus lens L65 having a concave surface facing the object side.

Table 3 below lists the values of the specifications of the third example.

(Table 3)
(Overall specifications)
W M T
f = 81.6 240.0 392.0
FNO = 4.59 5.00 5.77
2ω = 29.6 10.0 6.1
Y = 21.6 21.6 21.6
TL = 283.6 283.6 283.6
(Lens data)
m r d νd nd
1 320.893 2.500 31.27 1.90366
2 112.834 6.507 82.51 1.49782
3 -3554.736 0.100
4 115.342 5.868 82.51 1.49782
5 1458.395 0.100
6 111.883 5.830 82.51 1.49782
7 1458.395 D1
8 -4213.036 2.473 23.78 1.84666
9 -133.478 2.000 54.66 1.72916
10 59.984 1.578
11 128.930 4.222 23.78 1.84666
12 -77.994 2.000 54.66 1.72916
13 77.642 4.034
14 -57.953 2.000 47.38 1.78800
15 -3369.986 D2
16 130.165 6.000 54.66 1.72916
17 -68.142 0.200
18 284.742 4.725 58.93 1.51823
19 -50.235 2.000 29.37 1.95000
20 -241.532 D3
21 -56.158 2.000 40.76 1.88300
22 -110.578 D4
23 0.000 2.000 Aperture stop S
24 59.819 2.000 37.16 1.83400
25 40.409 7.114 64.11 1.51680
26 -91.984 0.100
27 90.161 2.573 82.51 1.49782
28 904.396 D5
29 110.032 2.314 25.43 1.80518
30 -108.778 1.500 40.76 1.88300
31 55.519 22.382
32 58.247 1.500 40.76 1.88300
33 30.631 4.891 38.01 1.60342
34 598.923 5.810
35 -34.467 1.500 40.76 1.88300
36 -68.483 BF
(Lens group data)
Lens group ST Focal length G1 1 135.000
G2 8 -36.474
G3 16 73.876
G4 21 -131.497
G5 23 61.193
G6 29 -55.551
(Variable interval data)
W M T
D1 8.441 49.813 58.145
D2 59.847 22.570 3.383
D3 17.930 17.586 23.344
D4 26.917 9.136 2.573
D5 16.815 23.327 26.470
BF 45.8 53.4 61.9
(Vibration correction data)
f K θ Dvr
Wide-angle end W 81.6 0.80 0.3 0.53
Intermediate focal length M 240.0 0.89 0.2 0.95
Telephoto end T 392.0 0.98 0.2 1.39
(Values for conditional expressions)
(1) f1 / f3 = 1.83
(2) (-f4) /f5=2.15
(3) f1 / TLw = 0.48
(4) f2 / TLw = 0.13
(5) f1 / (-f2) = 3.70
(6) (-f2) /f3=0.49
(7) f4 / f6 = 2.37
(8) f5 / (-f6) = 1.10

FIGS. 10A and 10B are graphs showing various aberrations in the wide-angle end state of the variable magnification optical system according to the third example. FIG. 10A shows the infinite focus state, and FIG. 10B shows 0.3 ° in the infinite focus state. The coma aberration figure when performing the rotational shake correction of is shown. 11A and 11B are graphs showing various aberrations in the intermediate focal length state of the variable magnification optical system according to the third example. FIG. 11A shows the infinite focus state, and FIG. A coma aberration diagram when 2o rotational blur correction is performed is shown. 12A and 12B are graphs showing various aberrations in the telephoto end state of the variable magnification optical system according to the third example. FIG. 12A shows the infinite focus state, and FIG. 12B shows 0.2 ° in the infinite focus state. The coma aberration figure when performing the rotational shake correction of is shown. As is apparent from each aberration diagram, in the third example, it is clear that various aberrations are corrected favorably and the imaging performance is excellent.

FIG. 13 is a schematic cross-sectional view of a single-lens reflex camera 1 (hereinafter simply referred to as a camera) as an optical apparatus including the above-described variable magnification optical system ZL. In this camera 1, light from an object (subject) (not shown) is collected by the taking lens 2 (variable magnification optical system ZL) and imaged on the focusing screen 4 via the quick return mirror 3. The light imaged on the focusing screen 4 is reflected a plurality of times in the pentaprism 5 and guided to the eyepiece lens 6. Thus, the photographer can observe the object (subject) image as an erect image through the eyepiece 6.

Further, when a release button (not shown) is pressed by the photographer, the quick return mirror 3 is retracted out of the optical path, and light of an object (subject) (not shown) condensed by the photographing lens 2 is captured on the image sensor 7. Form an image. Thereby, the light from the object (subject) is captured by the image sensor 7 and recorded as an object (subject) image in a memory (not shown). In this way, the photographer can shoot an object (subject) with the camera 1. The camera 1 shown in FIG. 13 may hold the variable magnification optical system ZL in a detachable manner, or may be formed integrally with the variable magnification optical system ZL. The camera 1 may be a so-called single-lens reflex camera. Further, even a camera that does not have a quick return mirror can achieve the same effects as the above camera.

The contents described below can be appropriately adopted as long as the optical performance is not impaired.
In the present embodiment, the variable magnification optical system ZL having a six-group configuration is shown, but the above-described configuration conditions and the like can be applied to other group configurations such as a seven-group configuration. Further, a configuration in which a lens or a lens group is added to the most object side, or a configuration in which a lens or a lens group is added to the most image side may be used. The lens group includes at least one lens that is separated by an air interval that changes at the time of zooming or focusing, or that is separated depending on whether or not it moves so as to have a component substantially orthogonal to the optical axis. The part which has is shown.

Also, a focusing lens group that performs focusing from an object at infinity to a near object by moving a single lens group, a plurality of lens groups, or a partial lens group in the optical axis direction may be used. In this case, the focusing lens group can be applied to autofocus, and is also suitable for driving a motor for autofocus (such as an ultrasonic motor). In particular, in the present embodiment, as described above, it is preferable that the third lens group G3 is a focusing lens group.

In addition, the lens group or the partial lens group is moved so as to have a component in a direction orthogonal to the optical axis, or is rotated (swayed) in the in-plane direction including the optical axis to reduce image blur caused by camera shake. A vibration-proof lens group to be corrected may be used. In particular, it is preferable that at least a part of the fifth lens group G5 or the sixth lens group G6 is an anti-vibration lens group.

Further, the lens surface may be formed of a spherical surface, a flat surface, or an aspheric surface. If all lens surfaces are formed with spherical surfaces without using an aspherical surface as in the variable magnification optical system ZL shown in this embodiment, lens processing and assembly adjustment are facilitated, and optical performance is deteriorated due to errors in processing and assembly adjustment. This is preferable. The same applies even if the lens surface includes a flat surface. Further, even when the image plane is deviated, it is preferable because there is little deterioration in drawing performance. If the lens surface is aspherical, the aspherical surface is an aspherical surface by grinding, a glass mold aspherical surface that is formed of glass with an aspherical shape, or a composite type nonspherical surface that is formed of a resin on the surface of glass. Any aspherical surface may be used. The lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.

In addition, each lens surface may be provided with an antireflection film having a high transmittance in a wide wavelength range in order to reduce flare and ghost and achieve high optical performance with high contrast.

In the variable magnification optical system ZL according to this embodiment, the variable magnification ratio is about 2.5 to 8.
In addition, in order to explain this application in an easy-to-understand manner, the configuration requirements of the embodiment have been described, but it goes without saying that the present application is not limited to this.

Claims

From the object side,
A first lens group having a positive refractive power;
A second lens group having negative refractive power;
A third lens group having positive refractive power;
A fourth lens group having negative refractive power;
A fifth lens group having positive refractive power;
A sixth lens group having negative refractive power;
The lens group moves so that at least a part of any one lens group includes a component in a direction orthogonal to the optical axis,
When the focal length of the first lens group is f1, the focal length of the third lens group is f3, the focal length of the fourth lens group is f4, and the focal length of the fifth lens group is f5, The following formula 1.62 <f1 / f3 <2.23
1.71 <(− f4) / f5 <2.99
A variable power optical system characterized by satisfying the following conditions.
Upon zooming, the distance between the first lens group and the second lens group changes, the distance between the second lens group and the third lens group changes, and the third lens group and the fourth lens The distance between the fourth lens group and the fifth lens group is changed, and the distance between the fifth lens group and the sixth lens group is changed. 2. The variable magnification optical system according to 1.
When the total length in the wide-angle end state is TLw, the following expression 0.30 <f1 / TLw <0.60
2. The variable magnification optical system according to claim 1, wherein the following condition is satisfied.
When the focal length of the second lens group is f2 and the total length in the wide-angle end state is TLw, the following expression 0.08 <(− f2) / TLw <0.15
2. The variable magnification optical system according to claim 1, wherein the following condition is satisfied.
2. The variable magnification optical system according to claim 1, further comprising an aperture stop between the third lens group and the sixth lens group.
2. The zoom optical system according to claim 1, wherein the first lens unit is fixed in the optical axis direction with respect to the image plane during zooming.
2. The variable magnification optical system according to claim 1, wherein at the time of focusing, at least a part of the third lens group moves along the optical axis.
An optical apparatus comprising the variable magnification optical system according to claim 1.
From the object side,
A first lens group having a positive refractive power;
A second lens group having negative refractive power;
A third lens group having positive refractive power;
A fourth lens group having negative refractive power;
A fifth lens group having positive refractive power;
A sixth lens group having negative refractive power;
During zooming, the first lens group is fixed in the optical axis direction with respect to the image plane,
When the focal length of the first lens group is f1, the focal length of the second lens group is f2, and the focal length of the third lens group is f3, the following expression 3.10 <f1 / (− f2) <5.00
0.40 <(− f2) / f3 <0.60
A variable power optical system characterized by satisfying the following conditions.
Upon zooming, the distance between the first lens group and the second lens group changes, the distance between the second lens group and the third lens group changes, and the third lens group and the fourth lens The distance between the fourth lens group and the fifth lens group is changed, and the distance between the fifth lens group and the sixth lens group is changed. 9. The zoom optical system according to 9.
When the focal length of the fourth lens group is f4 and the focal length of the sixth lens group is f6, the following expression 2.00 <f4 / f6 <3.00
The variable magnification optical system according to claim 9, wherein the following condition is satisfied.
When the focal length of the fifth lens group is f5 and the focal length of the sixth lens group is f6, the following formula 0.66 <f5 / (− f6) <1.50
The variable magnification optical system according to claim 9, wherein the following condition is satisfied.
10. The zoom optical system according to claim 9, further comprising an aperture stop between the third lens group and the sixth lens group.
10. The zoom optical system according to claim 9, wherein at least a part of any one of the lens groups moves so as to include a component in a direction orthogonal to the optical axis.
10. The zoom optical system according to claim 9, wherein at the time of focusing, at least a part of the third lens group moves along the optical axis.
An optical apparatus comprising the variable magnification optical system according to claim 9.
In order from the object side, 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, and a fourth lens having a negative refractive power A variable magnification optical system having a group, a fifth lens group having a positive refractive power, and a sixth lens group having a negative refractive power,
Arranging at least a part of any one of the lens groups so as to include a component in a direction orthogonal to the optical axis,
When the focal length of the first lens group is f1, the focal length of the third lens group is f3, the focal length of the fourth lens group is f4, and the focal length of the fifth lens group is f5, The following formula 1.62 <f1 / f3 <2.23
1.71 <(− f4) / f5 <2.99
A method of manufacturing a variable magnification optical system, wherein the zoom lens system is arranged so as to satisfy the above condition.
In order from the object side, 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, and a fourth lens having a negative refractive power A variable magnification optical system having a group, a fifth lens group having a positive refractive power, and a sixth lens group having a negative refractive power,
During zooming, the first lens group is disposed so as to be fixed in the optical axis direction with respect to the image plane,
When the focal length of the first lens group is f1, the focal length of the second lens group is f2, and the focal length of the third lens group is f3, the following expression 3.10 <f1 / (− f2) <5.00
0.40 <(− f2) / f3 <0.60
A method of manufacturing a variable magnification optical system, wherein the zoom lens system is arranged so as to satisfy the above condition.