JP5849767B2 - Variable magnification optical system and optical apparatus having the variable magnification optical system - Google Patents

Description

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

  Conventionally, a variable magnification optical system suitable for a photographic camera, an electronic still camera, a video camera, and the like has been proposed (see, for example, Patent Document 1).

JP 2010-043472 A

  However, in recent years, with the improvement in performance of cameras, a variable magnification optical system having higher optical performance is required.

The present invention has been made in view of such a problem, a variable magnification optical system having a higher optical performance, and aims to provide an optical apparatus having a variable magnification optical system.

In order to solve the above problems, a variable magnification optical system according to the present invention includes, 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 refraction. A third lens group having a power, a fourth lens group having a negative refractive power, and a fifth lens group having a positive refractive power, and upon zooming from the wide-angle end state to the telephoto end state, The interval between adjacent lens groups changes, the first lens group and the fifth lens group are fixed in the optical axis direction with respect to the image plane, the fourth lens group is composed of one negative meniscus lens, and It satisfies the conditions.
3.9 <f1 / (− f2) <5.4
−0.3 <fw / f14w <0.2
However,
f1: Focal length of the first lens group f2: Focal length of the second lens group
f14w: Composite focal length of the first lens group, the second lens group, the third lens group, and the fourth lens group in the wide-angle end state
fw: focal length of the entire system in the wide-angle end state

The zoom optical system according to the present invention includes, 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 having a positive refractive power. Group, a fourth lens group having a negative refractive power, and a fifth lens group having a positive refractive power, and at the time of zooming from the wide-angle end state to the telephoto end state, The interval changes, the first lens group and the fifth lens group are fixed in the optical axis direction with respect to the image plane, and the fourth lens group is composed of one negative meniscus lens, and satisfies the following condition: Features.
3.9 <f1 / (− f2) <5.4
1.66 <f1 / f3 <3.00
However,
f1: Focal length of the first lens group
f2: Focal length of the second lens group
f3: focal length of the third lens unit

The zoom optical system according to the present invention includes, 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 having a positive refractive power. Group, a fourth lens group having a negative refractive power, and a fifth lens group having a positive refractive power, and at the time of zooming from the wide-angle end state to the telephoto end state, The interval changes, the first lens group and the fifth lens group are fixed in the optical axis direction with respect to the image plane, and the fourth lens group is composed of one negative meniscus lens, and satisfies the following condition: Features.
3.9 <f1 / (− f2) <5.4
1.2 <(− f4) / f1 <2.5
However,
f1: Focal length of the first lens group
f2: Focal length of the second lens group
f4: focal length of the fourth lens unit

The zoom optical system according to the present invention includes, 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 having a positive refractive power. Group, a fourth lens group having a negative refractive power, and a fifth lens group having a positive refractive power, and at the time of zooming from the wide-angle end state to the telephoto end state, The distance is changed, and the first lens unit and the fifth lens unit are fixed in the optical axis direction with respect to the image plane, and satisfy the following condition.
3.7 <f1 / (− f2) <5.4
1.70 <f1 / f3 ≦ 1.94
However,
f1: Focal length of the first lens group
f2: Focal length of the second lens group
f3: focal length of the third lens unit

According to the present invention, the variable magnification optical system having a higher optical performance, and can provide an optical apparatus having a variable magnification optical system.

It is sectional drawing which shows the lens structure of the variable magnification optical system which concerns on 1st Example. FIG. 5A is a diagram illustrating various aberrations in the wide-angle end state of the variable magnification optical system according to the first example, where (a) shows an infinite focus state, and (b) shows when blur correction is performed in the infinite focus state. The coma aberration figure of is shown. FIG. 4A is a diagram illustrating various aberrations in the intermediate focal length state of the variable magnification optical system according to the first example, where (a) shows the infinite focus state, and (b) performs blur correction in the infinite focus state. The coma aberration figure at the time is shown. FIG. 5A is a diagram illustrating various aberrations in the telephoto end state of the variable magnification optical system according to the first example, where (a) shows an infinite focus state, and (b) shows a blur correction performed in the infinite focus state. The coma aberration figure of is shown. FIG. 4 is a diagram illustrating various aberrations of the zoom optical system according to the first example when focusing at short distance, where (a) shows a wide-angle end state, (b) shows an intermediate focal length state, and (c) shows telephoto. Indicates the end state. It is sectional drawing which shows the lens structure of the variable magnification optical system which concerns on 2nd Example. FIG. 5A is a diagram illustrating various aberrations of the zoom optical system according to Example 2 in the wide-angle end state, where (a) shows the infinite focus state, and (b) shows the shake correction performed in the infinite focus state. The coma aberration figure of is shown. FIG. 4A is a diagram illustrating various aberrations in the intermediate focal length state of the variable magnification optical system according to the second example, where (a) shows the infinite focus state, and (b) performs blur correction in the infinite focus state. The coma aberration figure at the time is shown. FIG. 5A is a diagram illustrating various aberrations in the telephoto end state of the variable magnification optical system according to Example 2, where (a) shows an infinite focus state, and (b) shows a case where blur correction is performed in the infinite focus state. The coma aberration figure of is shown. FIG. 6 is a diagram illustrating various aberrations when the zooming optical system according to Example 2 is in focus at short distance, where (a) shows a wide-angle end state, (b) shows an intermediate focal length state, and (c) shows telephoto. Indicates the end state. It is sectional drawing which shows the lens structure of the variable magnification optical system which concerns on 3rd Example. FIG. 5A is a diagram illustrating various aberrations of the zoom optical system according to Example 3 in the wide-angle end state, where (a) shows the infinite focus state, and (b) shows the shake correction performed in the infinite focus state. The coma aberration figure of is shown. FIG. 9A is a diagram illustrating various aberrations in the intermediate focal length state of the variable magnification optical system according to the third example, in which (a) shows the infinite focus state, and (b) performs blur correction in the infinite focus state. The coma aberration figure at the time is shown. FIG. 9A is a diagram illustrating various aberrations in the telephoto end state of the variable magnification optical system according to the third example, where (a) shows an infinite focus state, and (b) shows a case where blur correction is performed in the infinite focus state. The coma aberration figure of is shown. FIG. 6 is a diagram illustrating various aberrations of the variable magnification optical system according to Example 3 when focusing at short distance, where (a) shows a wide-angle end state, (b) shows an intermediate focal length state, and (c) shows telephoto. Indicates the end state. It is sectional drawing which shows the lens structure of the variable magnification optical system which concerns on 4th Example. FIG. 9A is a diagram illustrating various aberrations of the zoom optical system according to Example 4 in the wide-angle end state, where (a) shows the infinite focus state, and (b) shows the blur correction performed in the infinite focus state. The coma aberration figure of is shown. FIG. 7A is a diagram illustrating various aberrations in the intermediate focal length state of the variable magnification optical system according to the fourth example, where (a) shows the infinite focus state, and (b) performs blur correction in the infinite focus state. The coma aberration figure at the time is shown. FIG. 6A is a diagram illustrating various aberrations in the telephoto end state of the variable magnification optical system according to Example 4, where (a) shows the infinite focus state, and (b) shows the shake correction performed in the infinite focus state. The coma aberration figure of is shown. FIG. 9A is a diagram illustrating various aberrations of the variable magnification optical system according to Example 4 when focusing at close range, wherein (a) It is sectional drawing which shows the lens structure of the variable magnification optical system which concerns on 5th Example. FIG. 6A is a diagram illustrating various aberrations of the variable magnification optical system according to Example 5 in the wide-angle end state, where FIG. 5A illustrates the infinite focus state, and FIG. 5B illustrates the blur correction performed in the infinite focus state. The coma aberration figure of is shown. FIG. 6A is a diagram illustrating various aberrations in the intermediate focal length state of the variable magnification optical system according to the fifth example. FIG. 5A illustrates an infinite focus state, and FIG. 5B illustrates shake correction in the infinite focus state. The coma aberration figure at the time is shown. FIG. 6A is a diagram illustrating various aberrations in the telephoto end state of the variable magnification optical system according to Example 5, where (a) shows the infinite focus state, and (b) shows the case where blur correction is performed in the infinite focus state. The coma aberration figure of is shown. FIG. 10 is a diagram illustrating various aberrations of the variable magnification optical system according to Example 5 when focusing at short distance, where (a) shows a wide-angle end state, (b) shows an intermediate focal length state, and (c) shows telephoto. Indicates the end state. 1 is a cross-sectional view of a single-lens reflex camera equipped with a variable magnification optical system according to the present embodiment. It is a flowchart for demonstrating the manufacturing method of the variable magnification optical system which concerns on this 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, and a fifth lens group G5 having a positive refractive power are configured. In the zoom optical system ZL according to the present embodiment, the first lens group G1 and the fifth lens group G5 are fixed in the optical axis direction with respect to the image plane when zooming from the wide-angle end state to the telephoto end state. ing. In this way, by fixing the first lens group G1 and the fifth lens group G5 in the optical axis direction with respect to the image plane, fluctuations in various aberrations such as spherical aberration at the time of zooming can be reduced. Moreover, it can be set as the structure whose full length does not change at the time of zooming.

  Such a variable magnification optical system ZL according to this embodiment desirably satisfies the following conditional expression (1).

3.7 <f1 / (− f2) <5.4 (1)
However,
f1: Focal length of the first lens group G1 f2: Focal length of the second lens group G2

  Conditional expression (1) is a conditional expression that defines the focal length f1 of the first lens group G1 and the focal length f2 of the second lens group G2. By satisfying this conditional expression (1), it is possible to realize a variable magnification optical system ZL having an optical performance in which various aberrations such as spherical aberration, coma aberration, and field curvature are well corrected.

  When the upper limit value of the conditional expression (1) is exceeded, the refractive power of the first lens group G1 becomes weak, the refractive power balance with the second lens group G2 is lost, and spherical aberration, coma aberration, and field curvature It becomes difficult to correct various aberrations. Moreover, the overall length of the variable magnification optical system ZL is undesirably large. In order to secure the effect of the present application, it is desirable to set the upper limit value of conditional expression (1) to 5.2.

  If the lower limit of conditional expression (1) is not reached, the refractive power of the second lens group G2 becomes strong, and the balance of the refractive power with the first lens group G1 is lost, so that spherical aberration, coma aberration, and image plane are lost. Correction of various aberrations of curvature becomes difficult. Moreover, the overall length of the variable magnification optical system ZL is undesirably large. In order to secure the effect of the present application, it is desirable to set the lower limit value of conditional expression (1) to 3.9.

  In addition, it is desirable that the variable magnification optical system ZL according to the present embodiment satisfies the following conditional expression (2).

−0.3 <fw / f14w <0.2 (2)
However,
f14w: the combined focal length of the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4 in the wide-angle end state fw: the focal length of the entire system in the wide-angle end state

  Conditional expression (2) defines the focal length fw of the entire variable magnification optical system ZL and the combined focal length f14w from the first lens group G1 to the fourth lens group G4 in the wide-angle end state. It is. The present variable magnification optical system ZL can satisfy the conditional expression (2) to realize good optical performance at the time of variable magnification.

  When the upper limit value of the conditional expression (2) is exceeded, the combined refractive power from the first lens group G1 to the fourth lens group G4 in the wide-angle end state becomes strong, and from the first lens group G1 to the fourth lens group G4. The refractive power balance between the two is lost, and it becomes difficult to correct spherical aberration, coma aberration, and various aberrations of field curvature. In order to secure the effect of the present application, it is desirable to set the upper limit value of conditional expression (2) to 0.13.

  If the lower limit of conditional expression (2) is not reached, the combined refractive power from the first lens group G1 to the fourth lens group G4 in the wide-angle end state becomes weak, and the first lens group G1 to the fourth lens group G4. Thus, the balance of refractive power is lost, and it is difficult to correct spherical aberration, coma aberration, and various aberrations of field curvature. In order to secure the effect of the present application, it is desirable to set the lower limit value of conditional expression (2) to −0.25.

  In addition, it is desirable that the variable magnification optical system ZL according to the present embodiment satisfies the following conditional expression (3).

1.66 <f1 / f3 <3.00 (3)
However,
f1: Focal length of the first lens group G1 f3: Focal length of the third lens group G3

  Conditional expression (3) is a conditional expression that defines the focal length f1 of the first lens group G1 and the focal length f3 of the third lens group G3. The zooming optical system ZL satisfies this conditional expression (3) and can realize good optical performance during zooming.

  When the upper limit of conditional expression (3) is exceeded, the refractive power of the first lens group G1 becomes weak, the balance of refractive power with the third lens group G3 is lost, and spherical aberration, coma aberration, and field curvature It becomes difficult to correct various aberrations. Moreover, the overall length of the variable magnification optical system ZL is undesirably large. In order to secure the effect of the present application, it is desirable to set the upper limit of conditional expression (3) to 2.80.

  If the lower limit of conditional expression (3) is not reached, the refractive power of the third lens group G3 becomes strong, the balance of refractive power with the first lens group G1 is lost, and spherical aberration, coma aberration, and image plane Correction of various aberrations of curvature becomes difficult. Moreover, the overall length of the variable magnification optical system ZL is undesirably large. In order to secure the effect of the present application, it is desirable to set the lower limit value of conditional expression (3) to 1.70.

  In addition, it is desirable that the variable magnification optical system ZL according to the present embodiment satisfies the following conditional expression (4).

1.2 <(− f4) / f1 <2.5 (4)
However,
f1: Focal length of the first lens group G1 f4: Focal length of the fourth lens group G4

  Conditional expression (4) is a conditional expression that defines the focal length f4 of the fourth lens group G4 and the focal length f1 of the first lens group G1. The zooming optical system ZL satisfies this conditional expression (4) and can realize good optical performance at the time of zooming.

  If the upper limit of conditional expression (4) is exceeded, the balance of the refractive powers of the fourth lens group G4 and the first lens group G1 will be lost, and the spherical aberration at the time of zooming will deteriorate. In order to secure the effect of the present application, it is desirable to set the upper limit of conditional expression (4) to 2.3.

  If the lower limit of conditional expression (4) is not reached, the balance of refractive power between the fourth lens group G4 and the first lens group G1 will be lost, and the spherical aberration at the time of zooming will deteriorate. In order to secure the effect of the present application, it is desirable to set the lower limit value of conditional expression (4) to 1.4.

  In addition, it is desirable that the variable magnification optical system ZL according to the present embodiment satisfies the following conditional expression (5).

0.3 <(fw / f14w) / (ft / f14t) <1.2 (5)
However,
f14w: Composite focal length of the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4 in the wide-angle end state f14t: the first lens group G1 and the second lens in the telephoto end state The combined focal length of the group G2, the third lens group G3, and the fourth lens group G4 fw: the focal length of the entire system in the wide-angle end state ft: the focal length of the entire system in the telephoto end state

  Conditional expression (5) satisfies the ratio of the focal length fw of the entire zooming optical system ZL to the combined focal length f14w from the first lens group G1 to the fourth lens group G4 in the wide-angle end state, and in the telephoto end state. It is a conditional expression that defines the ratio of the focal length ft of the entire variable magnification optical system ZL to the combined focal length f14t from the first lens group G1 to the fourth lens group G4. The zooming optical system ZL satisfies this conditional expression (5) and can realize good optical performance at the zooming.

  When the upper limit value of the conditional expression (5) is exceeded, the balance of the combined refractive power from the first lens group G1 to the fourth lens group G4 at the time of zooming is lost, and spherical aberration, coma aberration, and field curvature are lost. Correction of various aberrations becomes difficult. In order to secure the effect of the present application, it is desirable to set the upper limit of conditional expression (5) to 1.1.

  If the lower limit of conditional expression (5) is not reached, the balance of the combined refractive powers from the first lens group G1 to the fourth lens group G4 at the time of zooming is lost, and spherical aberration, coma aberration, and image plane are lost. Correction of various aberrations of curvature becomes difficult. In order to secure the effect of the present application, it is desirable to set the lower limit value of conditional expression (5) to 0.4.

  The variable magnification optical system ZL according to the present embodiment is a vibration-proof lens group G5vr that moves so that at least a part of the fifth lens group G5 includes a component in a direction orthogonal to the optical axis. The vibration lens group G5vr preferably includes at least one positive lens and one negative lens. With this configuration, it is possible to satisfactorily correct the variation in lateral chromatic aberration during image stabilization.

  In the zoom optical system ZL according to the present embodiment, it is desirable that the third lens group G3 moves along the optical axis during focusing. With this configuration, it is possible to satisfactorily correct variations in various aberrations such as spherical aberration during focusing.

  In the zoom optical system ZL according to the present embodiment, each of the first lens group G1, the second lens group G2, the third lens group G3, and the fifth lens group G5 has at least one cemented lens. It is desirable that With this configuration, it is possible to satisfactorily correct the variation in lateral chromatic aberration during zooming.

  In the zoom optical system ZL according to the present embodiment, it is desirable that the fourth lens group G4 is composed of one lens component. With this configuration, it is possible to reduce decentration coma and curvature of field that occur due to decentration due to manufacturing errors.

  In the variable magnification optical system ZL according to the present embodiment, it is desirable that the fourth lens group G4 is composed of one negative meniscus lens. With this configuration, spherical aberration at the telephoto end can be effectively corrected.

  In addition, the zoom optical system ZL according to the present embodiment has the second lens so that the distance between the second lens group G2 and the third lens group G3 is reduced when zooming from the wide-angle end state to the telephoto end state. It is desirable for the third lens group G3 to move so that the group G2 moves to the image plane side and the distance between the third lens group G3 and the fourth lens group G4 changes. With this configuration, the variable magnification optical system ZL can be reduced in size and increased in magnification.

  In the variable magnification optical system ZL according to the present embodiment, it is desirable that all lens surfaces are spherical surfaces. When the lens surface is formed of a spherical surface, it is preferable because lens processing and assembly adjustment are facilitated, and deterioration of optical performance due to errors in processing and assembly adjustment can be prevented. Further, even when the image plane is deviated, it is preferable because there is little deterioration in drawing performance. The same applies to a flat lens surface.

  FIG. 26 shows 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. 26 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 five-group or 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 refers to a portion having at least one lens that is separated by an air interval that changes at the time of zooming or that is separated depending on whether or not it moves so as to have a component substantially orthogonal to the optical axis.

  Alternatively, a single lens group, a plurality of lens groups, or a partial lens group may be moved in the optical axis direction to be a focusing lens group that performs focusing from an object at infinity to a near object. 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, it is preferable that at least a part of 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 is an anti-vibration lens group.

  Further, as shown in the present embodiment, the lens surfaces may be formed with all the lens surfaces spherical or may be formed with a flat surface or an aspherical surface. Here, when the lens surface is aspherical, the aspherical surface is an aspherical surface by grinding, a glass mold aspherical surface made of glass with an aspherical shape, and a composite type in which resin is formed on the glass surface in an aspherical shape 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.

  The aperture stop is preferably disposed in or near the fifth lens group G5. However, the role of the aperture stop may be substituted by a lens frame without providing a member as the aperture stop.

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

  The variable magnification optical system ZL according to the present embodiment has a variable magnification ratio of about 1.5 to 5.

  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.

  Hereinafter, an outline of a method for manufacturing the variable magnification optical system ZL of the present embodiment will be described with reference to FIG. First, the first to fifth lens groups G1 to G5 are prepared by arranging each lens (step S100). Specifically, in the present embodiment, for example, as illustrated in FIG. 1, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex lens L12, a biconvex lens L13, and an object A positive meniscus lens L14 having a convex surface on the side is arranged as a first lens group G1, and a cemented lens of a biconcave lens L21, a biconcave lens L22 and a positive meniscus lens L23 having a convex surface on the object side, and on the object side A cemented lens of a positive meniscus lens L24 having a concave surface and a biconcave lens L25 is arranged to form the second lens group G2, and includes a biconvex lens L31, and a negative meniscus lens L32 having a convex surface facing the object side and a biconvex lens L33. A cemented lens is arranged to form a third lens group G3, a negative meniscus lens L41 having a concave surface facing the object side is arranged to form a fourth lens group G4, and biconvex. Lens L51, positive meniscus lens L52 having a convex surface facing the object side, cemented lens of biconcave lens L53 and biconvex lens L54, cemented lens of biconvex lens L55 and negative meniscus lens L56 having a concave surface facing the object side, biconcave lens L57 A biconvex lens L58, a negative meniscus lens L59 having a concave surface facing the object side, and a positive meniscus lens L510 having a convex surface facing the object side are arranged as a fifth lens group G5.

  At this time, the first lens group G1 and the fifth lens group G5 are arranged so as to be fixed in the optical axis direction with respect to the image plane upon zooming from the wide-angle end state to the telephoto end state (step S200).

  Then, these first to fifth lens groups G1 to G5 are arranged so as to satisfy the above-described conditional expression (1) (step S300).

  Hereinafter, each example of the present application will be described with reference to the drawings. 1, 6, 11, 16, and 21 are cross-sectional views illustrating a configuration of a variable magnification optical system ZL (ZL1 to ZL5) according to each example. In the lower part of the sectional views of these variable magnification optical systems ZL1 to ZL5, the light of each lens group G1 to G5 (or G6) when changing magnification from the wide-angle end state (W) to the telephoto end state (T) is shown. The moving direction along the axis is indicated by an arrow (the first lens group G1 and the fifth lens group G5 are fixed in the optical axis direction with respect to the image plane during zooming).

[First embodiment]
FIG. 1 shows a lens configuration diagram and zoom locus of the variable magnification optical system ZL1 according to the first example. As shown in FIG. 1, the variable magnification optical system ZL1 according to the first example includes a first lens group G1 having a positive refractive power and a second lens group G2 having a negative refractive power in order from the object side. And a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.

  The first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface directed toward the object side and a biconvex lens L12, a biconvex lens L13, and a positive meniscus lens L14 having a convex surface directed toward the object side. Composed. The second lens group G2 includes, in order from the object side, a biconcave lens L21, a cemented lens of the biconcave lens L22 and a positive meniscus lens L23 having a convex surface facing the object side, and a positive meniscus lens having a concave surface facing the object side. It is composed of a cemented lens of L24 and a biconcave lens L25. The third lens group G3 includes, in order from the object side, a biconvex lens L31, and a cemented lens of a negative meniscus lens L32 having a convex surface facing the object side and a biconvex lens L33. 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, a biconvex lens L51, a positive meniscus lens L52 having a convex surface directed toward the object side, a cemented lens of the biconcave lens L53 and the biconvex lens L54, and a concave surface on the biconvex lens L55 and the object side. Is composed of a cemented lens with a negative meniscus lens L56 facing the lens, a biconcave lens L57, a biconvex lens L58, a negative meniscus lens L59 with a concave surface facing the object side, and a positive meniscus lens L510 with a convex surface facing the object side. Thus, the variable magnification optical system ZL1 according to the first example includes at least one cemented lens in each of the first lens group G1, the second lens group G2, the third lens group G3, and the fifth lens group G5. It is comprised. The aperture stop S is disposed between the biconvex lens L54 and the biconvex lens L55 of the fifth lens group G5.

  In the variable magnification optical system ZL1 according to the first example having such a configuration, when changing the magnification from the wide-angle end state to the telephoto end state, the distance between the first lens group G1 and the second lens group G2 increases. The second lens group G2 moves toward the image plane side so that the distance between the second lens group G2 and the third lens group G3 decreases, and the third lens group G3 includes the fourth lens group G4, the third lens group G3, and the like. The fourth lens group G4 moves so that the distance between the fifth lens group G4 and the fourth lens group G4 decreases so that the distance between them increases.

  In the variable magnification optical system ZL1 according to the first example, the third lens group G3 moves on the optical axis from the object side to the image side when focusing from an infinite object point to a short distance object point. To do.

  In the variable magnification optical system ZL1 according to the first example, the cemented lens of the biconvex lens L55 of the fifth lens group G5 and the negative meniscus lens L56 having a concave surface facing the object side, and the biconcave lens L57 are antivibrated. By making the lens group G5vr and moving the anti-vibration lens group G5vr so as to include a component in a direction perpendicular to the optical axis, image plane correction at the time of occurrence of blurring is performed. Thus, the anti-vibration lens group G5vr has at least one positive lens and one negative lens.

  Table 1 below lists values of specifications of the variable magnification optical system ZL1 according to the first example. In Table 1, the overall specifications represent the focal length f, F number FNO, angle of view 2ω, image height Y, and total length TL in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively. . Here, the total length TL represents the distance on the optical axis from the first surface of the lens surface to the image plane when focusing on infinity. Further, the first column m of the lens data 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, and the third column. d is the distance (surface distance) on the optical axis from each optical surface to the next optical surface. The fourth column νd and the fifth column nd are the Abbe number and refractive index for the d-line (λ = 587.6 nm). Is shown. The surface numbers 1 to 41 shown in Table 1 correspond to the numbers 1 to 41 shown in FIG. The lens group focal length indicates the start surface and the focal length of each of the first to fifth lens groups G1 to G5. 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 an aperture 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 embodiments.

(Table 1)
[Overall specifications]
Wide-angle end state Intermediate focal length state Telephoto end state f = 102.0 to 200.0 to 294.0
FNO = 4.1 to 4.1 to 4.1
2ω = 24.0 to 12.2 to 8.3
Y = 21.6-21.6-21.6
TL = 285.99 to 285.99 to 285.99

[Lens data]
m r d νd nd
1 215.03 3.00 39.6 1.80440
2 87.06 10.00 82.6 1.49782
3 -2377.73 0.10
4 88.93 11.50 82.6 1.49782
5 -1432.07 0.10
6 81.93 5.00 67.9 1.59319
7 82.38 d7
8 -475.88 2.40 46.6 1.80400
9 60.13 5.99
10 -429.26 2.50 65.4 1.60300
11 40.53 5.50 23.8 1.84666
12 166.18 3.51
13 -68.91 4.00 30.1 1.69895
14 -34.82 2.20 47.4 1.78800
15 314.04 d15
16 152.00 4.50 34.9 1.80 100
17 -128.46 0.10
18 177.47 2.94 23.8 1.84666
19 47.93 8.80 63.3 1.61800
20 -82.90 d20
21 -63.34 2.50 70.3 1.48749
22 -168.91 d22
23 43.14 8.00 82.6 1.49782
24 -229.79 1.00
25 44.71 5.00 70.3 1.48749
26 127.28 2.04
27 -266.67 2.00 35.7 1.90265
28 45.62 6.00 58.8 1.51823
29 -375.22 0.19
30 0.00 16.39 Aperture stop S
31 1800.11 5.00 25.5 1.80518
32 -31.57 1.60 55.5 1.69680
33 -126.31 4.00
34 -65.01 2.00 35.7 1.90265
35 42.85 5.52
36 56.31 6.00 58.8 1.51823
37 -69.48 3.07
38 -25.31 2.40 40.7 1.88300
39 -33.69 0.10
40 66.02 3.50 41.0 1.58144
41 132.25 Bf

[Lens focal length]
Lens group Start surface Focal length 1st lens group 1 149.00
Second lens group 8 -29.00
Third lens group 16 54.84
Fourth lens group 21 -209.50
Fifth lens group 23 134.85

  The zoom optical system ZL1 according to the first example has an on-axis air gap d7 between the first lens group G1 and the second lens group G2, and the second lens group G2 when zooming from the wide-angle end state to the telephoto end state. And the third lens group G3, the on-axis air distance d15, the third lens group G3 and the fourth lens group G4, and the fourth lens group G4 and the fifth lens group G5. The air interval d22 changes. Table 2 below shows values of the variable intervals and the back focus Bf in the wide-angle end state, the intermediate focal length state, and the telephoto end state in the infinity in-focus state. The back focus Bf represents the distance on the optical axis from the most image side lens surface (for example, the 41st surface in FIG. 1) to the image surface. This description is the same in the following embodiments.

(Table 2)
[Variable interval data]
Wide angle end Intermediate focal length Telephoto end f 102.00 200.00 294.00
d7 6.00 48.84 64.07
d15 19.04 10.76 3.00
d20 6.41 11.94 14.17
d22 49.88 9.80 0.10
Bf 56.13 56.13 56.13

  In the zoom optical system ZL1, the focal length of the entire system is f, and the image stabilization coefficient (ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction) is K. In order to correct the rotational shake of the angle θ, the anti-vibration lens group G5vr may be moved in the direction orthogonal to the optical axis by (f · tan θ) / K (the same applies to the following embodiments). Table 3 below shows the focal length, the image stabilization coefficient, and the rotation blur in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system ZL1 at the time of focusing on infinity in the first embodiment. °] and lens group movement [mm]. These descriptions are the same in the following embodiments.

(Table 3)
Focal length Anti-vibration coefficient Rotation blur Lens group movement Wide-angle end 102.0 -1.58 0.33 -0.369
Intermediate focal length 200.0 -1.58 0.23 -0.517
Telephoto end 294.0 -1.58 0.19 -0.627

  Table 4 below shows values corresponding to each condition in the first embodiment. In Table 4, f1 is the focal length of the first lens group G1, f2 is the focal length of the second lens group G2, f3 is the focal length of the third lens group G3, and f4 is the fourth lens group G4. F14w is the combined focal length from the first lens group G1 to the fourth lens group G4 in the wide-angle end state, and f14t is the combined focal length from the first lens group G1 to the fourth lens group G4 in the telephoto end state. The focal length, fw represents the focal length of the entire system in the wide-angle end state, and ft represents the focal length of the entire system in the telephoto end state. The description of the above symbols is the same in the following embodiments.

(Table 4)
(1) f1 / (− f2) = 5.2
(2) fw / f14w = -0.08
(3) f1 / f3 = 2.73
(4) (−f4) /f1=1.4
(5) (fw / f14w) / (ft / f14t) = 1.0

  Thus, the zoom optical system ZL1 according to the first example satisfies all the conditional expressions (1) to (5).

  FIGS. 2 to 5 show spherical aberrations in the wide-angle end state, the intermediate focal length state, and the telephoto end state at the time of focusing at infinity and focusing at close distance of the variable magnification optical system ZL1 according to the first example. The aberration diagrams of astigmatism, distortion, lateral chromatic aberration, and coma are shown. 2 to 4, (a) shows various aberrations in the infinite focus state, and (b) shows coma aberration when blur correction is performed by the lens group movement amount shown in Table 3 above. . FIG. 5 shows various aberrations in the short distance in-focus state. In each aberration diagram, FNO is the F number, A is the half field angle [°], H0 is the object height, d is the d-line (λ = 587.6 nm), and g is the g-line (λ = 435.6 nm). ) Respectively. Further, in each aberration diagram (FIGS. 2 to 4) at the time of focusing on infinity, the spherical aberration diagram shows the F-number value corresponding to the maximum aperture, and the astigmatism diagram and the distortion diagram show the maximum angle of view. The coma aberration diagram shows the values of the respective angles of view. Further, in each aberration diagram (FIG. 5) at the time of focusing on a short distance, the spherical aberration diagram shows the maximum numerical aperture, the astigmatism diagram and the distortion diagram show the maximum object height, and the coma aberration diagram. Shows the value of each object height. In the astigmatism diagram, 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 the respective aberration diagrams, in the first example, it is understood that various aberrations are favorably corrected from the wide-angle end state to the telephoto end state, and the imaging performance is excellent.

[Second Embodiment]
FIG. 6 shows a lens configuration diagram and zoom locus of the variable magnification optical system ZL2 according to the second example. As shown in FIG. 6, the variable magnification optical system ZL2 according to the second example 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. And a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.

  The first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex positive lens L12, a biconvex lens L13, and a positive surface having a convex surface facing the object side. It comprises a meniscus lens L14. The second lens group G2 includes, in order from the object side, a negative meniscus lens L21 having a convex surface facing the object side, a cemented lens of a biconcave lens L22 and a positive meniscus lens L23 having a convex surface facing the object side, and the object side. It is composed of a cemented lens of a negative meniscus lens L24 having a concave surface facing the lens and a biconcave lens L25. The third lens group G3 includes, in order from the object side, a biconvex lens L31, and a cemented lens of a negative meniscus lens L32 having a convex surface facing the object side and a biconvex lens L33. 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, a biconvex lens L51, a positive meniscus lens L52 with a convex surface facing the object side, a negative meniscus lens L53 with a convex surface facing the object side, and a positive surface with a convex surface facing the object side. A cemented lens with a meniscus lens L54, a cemented lens with a biconvex lens L55 and a negative meniscus lens L56 having a concave surface facing the object side, a biconcave lens L57, a biconvex lens L58, a negative meniscus lens L59 with a concave surface facing the object side, and It is composed of a biconvex lens L510. Thus, the variable magnification optical system ZL2 according to the second example includes at least one cemented lens in each of the first lens group G1, the second lens group G2, the third lens group G3, and the fifth lens group G5. It is comprised. The aperture stop S is disposed between the positive meniscus lens L54 and the biconvex lens L55 of the fifth lens group G5.

  In the variable magnification optical system ZL2 according to the second example having such a configuration, when changing the magnification from the wide-angle end state to the telephoto end state, the distance between the first lens group G1 and the second lens group G2 increases. The second lens group G2 moves toward the image plane side so that the distance between the second lens group G2 and the third lens group G3 decreases, and the third lens group G3 moves once toward the image plane side and then moves toward the object side. The fourth lens group G4 once moves to the image plane side and then moves to the object side.

  In the zoom optical system ZL2 according to the second example, the third lens group G3 moves on the optical axis from the object side to the image side when focusing from an infinite object point to a short-distance object point. To do.

  In the variable magnification optical system ZL2 according to the second example, the cemented lens of the biconvex lens L55 of the fifth lens group G5 and the negative meniscus lens L56 having a concave surface on the object side, and the biconcave lens L57 are antivibrated. By making the lens group G5vr and moving the anti-vibration lens group G5vr so as to include a component in a direction perpendicular to the optical axis, image plane correction at the time of occurrence of blurring is performed. Thus, the anti-vibration lens group G5vr has at least one positive lens and one negative lens.

  Table 5 below lists values of specifications of the variable magnification optical system ZL2 according to the second example. The surface numbers 1 to 41 shown in Table 5 correspond to the numbers 1 to 41 shown in FIG.

(Table 5)
[Overall specifications]
Wide-angle end state Intermediate focal length state Telephoto end state f = 102.0 to 200.0 to 294.0
FNO = 4.1 to 4.1 to 4.1
2ω = 24.0 to 12.2 to 8.3
Y = 21.6-21.6-21.6
TL = 287.92 to 287.92 to 287.92

[Lens data]
m r d νd nd
1 873.94 3.00 39.6 1.80440
2 99.81 10.00 82.6 1.49782
3 -2839.21 0.10
4 110.00 11.50 82.6 1.49782
5 -331.59 0.10
6 86.12 7.00 67.9 1.59319
7 205.28 d7
8 315.98 2.40 46.6 1.80 400
9 45.29 10.10
10 -132.71 2.50 65.4 1.60300
11 49.21 5.50 23.8 1.84666
12 922.81 3.84
13 -58.96 4.00 30.1 1.69895
14 -35.11 2.20 47.4 1.78800
15 53303.88 d15
16 159.00 4.50 34.9 1.80 100
17 -159.00 0.10
18 174.43 2.94 23.8 1.84666
19 52.00 8.80 63.3 1.61800
20 -104.45 d20
21 -68.70 2.50 70.3 1.48749
22 -142.62 d22
23 43.72 8.00 82.6 1.49782
24 -654.47 1.00
25 42.36 5.00 70.3 1.48749
26 128.57 1.64
27 8755.11 2.00 35.7 1.90265
28 38.22 6.00 58.8 1.51823
29 3087.09 2.29
30 0.00 11.18 Aperture stop S
31 594.64 5.00 25.5 1.80518
32 -34.74 1.60 55.5 1.69680
33 -361.05 4.10
34 -112.09 2.00 35.7 1.90265
35 39.31 5.15
36 48.26 6.00 58.8 1.51823
37 -77.00 6.83
38 -25.99 2.40 40.7 1.88300
39 -43.55 0.10
40 100.57 3.50 41.0 1.58144
41 -884.31 Bf

[Lens focal length]
Lens group Start surface Focal length 1st lens group 1 121.76
Second lens group 8 -29.12
Third lens group 16 62.80
Fourth lens group 21 -274.92
5th lens group 23 176.03

  The zoom optical system ZL2 according to the second example has an on-axis air gap d7 between the first lens group G1 and the second lens group G2 and the second lens group G2 when zooming from the wide-angle end state to the telephoto end state. And the third lens group G3, the on-axis air distance d15, the third lens group G3 and the fourth lens group G4, and the fourth lens group G4 and the fifth lens group G5. The air interval d22 changes. Table 6 below shows values of the variable intervals and the back focus Bf in the wide-angle end state, the intermediate focal length state, and the telephoto end state in the infinity in-focus state.

(Table 6)
[Variable interval data]
Wide angle end Intermediate focal length Telephoto end f 102.00 200.00 294.00
d7 6.00 48.84 64.07
d15 19.04 10.76 3.00
d20 6.41 11.94 14.17
d22 49.88 9.80 0.10
Bf 56.13 56.13 56.13

  Table 7 below shows the focal length, anti-vibration coefficient, and rotational blur in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system ZL2 when focusing on infinity in the second embodiment. °] and lens group movement [mm].

(Table 7)
Focal length Anti-vibration coefficient Rotation blur Lens group movement Wide-angle end 102.0 -1.69 0.33 -0.344
Intermediate focal length 200.0 -1.69 0.23 -0.481
Telephoto end 294.0 -1.69 0.19 -0.584

  Table 8 below shows values corresponding to the conditional expressions in the second embodiment.

(Table 8)
(1) f1 / (− f2) = 4.2
(2) fw / f14w = 0.07
(3) f1 / f3 = 1.94
(4) (−f4) /f1=2.3
(5) (fw / f14w) / (ft / f14t) = 1.0

  Thus, the variable magnification optical system ZL2 according to the second example satisfies all the conditional expressions (1) to (5).

  FIGS. 7 to 10 show spherical aberrations in the wide-angle end state, the intermediate focal length state, and the telephoto end state when the variable magnification optical system ZL2 according to the second embodiment is in focus at infinity and at close focus. The aberration diagrams of astigmatism, distortion, lateral chromatic aberration, and coma are shown. 7 to 9, (a) shows various aberrations in the infinite focus state, and (b) shows coma aberration when blur correction is performed by the lens group movement amount shown in Table 7 above. . FIG. 10 shows various aberrations in the short distance in-focus state. As is apparent from the respective aberration diagrams, in the second example, it is understood that various aberrations are favorably corrected from the wide-angle end state to the telephoto end state, and the imaging performance is excellent.

[Third embodiment]
FIG. 11 shows a lens configuration diagram and zoom locus of the variable magnification optical system ZL3 according to the third example. As shown in FIG. 11, the variable magnification optical system ZL3 according to the third example 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. And a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.

  The first lens group G1, in order from the object side, includes a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex lens L12, a biconvex lens L13, and a positive meniscus lens L14 having a convex surface facing the object side. Composed. The second lens group G2 includes, in order from the object side, a biconcave lens L21, a cemented lens of the biconcave lens L22 and a positive meniscus lens L23 having a convex surface facing the object side, and a positive meniscus lens having a concave surface facing the object side. It is composed of a cemented lens of L24 and a negative meniscus lens L25 having a concave surface facing the object side. The third lens group G3 includes, in order from the object side, a biconvex lens L31, and a cemented lens of a negative meniscus lens L32 having a convex surface facing the object side and a biconvex lens L33. 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, a biconvex lens L51, a positive meniscus lens L52 having a convex surface directed toward the object side, a cemented lens of the biconcave lens L53 and the biconvex lens L54, and a concave surface on the biconvex lens L55 and the object side. Is composed of a cemented lens with a negative meniscus lens L56 facing the lens, a biconcave lens L57, a biconvex lens L58, a negative meniscus lens L59 with a concave surface facing the object side, and a positive meniscus lens L510 with a convex surface facing the object side. Thus, the variable magnification optical system ZL3 according to the third example includes at least one cemented lens in each of the first lens group G1, the second lens group G2, the third lens group G3, and the fifth lens group G5. It is comprised. The aperture stop S is disposed between the biconvex lens L54 and the biconvex lens L55 of the fifth lens group G5.

  In the zoom optical system ZL3 according to the third example having such a configuration, when zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group G1 and the second lens group G2 is increased. The second lens group G2 moves toward the image plane side so that the distance between the second lens group G2 and the third lens group G3 decreases, and the third lens group G3 moves once toward the image plane side and then moves toward the object side. The fourth lens group G4 once moves to the image plane side and then moves to the object side.

  In the zoom optical system ZL3 according to the third example, the third lens group G3 moves on the optical axis from the object side to the image side when focusing from an infinite object point to a short-distance object point. To do.

  In the variable magnification optical system ZL3 according to the third example, the cemented lens of the biconvex lens L55 of the fifth lens group G5 and the negative meniscus lens L56 having a concave surface on the object side, and the biconcave lens L57 are antivibrated. By making the lens group G5vr and moving the anti-vibration lens group G5vr so as to include a component in a direction perpendicular to the optical axis, image plane correction at the time of occurrence of blurring is performed. Thus, the anti-vibration lens group G5vr has at least one positive lens and one negative lens.

  Table 9 below provides values of specifications of the variable magnification optical system ZL3 according to the third example. The surface numbers 1 to 41 shown in Table 9 correspond to the numbers 1 to 41 shown in FIG.

(Table 9)
[Overall specifications]
Wide-angle end state Intermediate focal length state Telephoto end state f = 102.0 to 200.0 to 294.0
FNO = 4.1 to 4.1 to 4.1
2ω = 24.0 to 12.2 to 8.3
Y = 21.6-21.6-21.6
TL = 287.97 to 287.97 to 287.97

[Lens data]
m r d νd nd
1 1952.31 3.00 39.6 1.80440
2 98.02 10.00 82.6 1.49782
3 -925.08 0.10
4 112.07 11.50 82.6 1.49782
5 -343.75 0.10
6 82.47 7.00 67.9 1.59319
7 326.17 d7
8 2710.38 2.40 46.6 1.80 400
9 44.67 13.10
10 -95.01 2.50 65.4 1.60300
11 53.74 5.50 23.8 1.84666
12 1759.38 3.08
13 -74.86 4.00 30.1 1.69895
14 -37.19 2.20 47.4 1.78800
15 -2269.35 d15
16 174.60 4.50 34.9 1.80 100
17 -182.34 0.10
18 123.06 2.94 23.8 1.84666
19 49.49 8.80 63.3 1.61800
20 -121.20 d22
21 -74.35 2.50 70.3 1.48749
22 -243.16 24.82
23 44.44 8.00 82.6 1.49782
24 -203.10 1.00
25 50.61 5.00 70.3 1.48749
26 213.04 1.86
27 -262.72 2.00 35.7 1.90265
28 44.08 6.00 58.8 1.51823
29 -1875.66 2.15
30 0.00 11.32 Aperture stop S
31 648.86 5.00 25.5 1.80518
32 -37.47 1.60 55.5 1.69680
33 -103.62 4.01
34 -67.73 2.00 35.7 1.90265
35 47.32 6.19
36 58.49 6.00 58.8 1.51823
37 -63.28 5.67
38 -28.48 2.40 40.7 1.88300
39 -50.15 0.10
40 86.90 3.50 41.0 1.58144
41 430.05 Bf

[Lens focal length]
Lens group Start surface Focal length first lens group 1 108.00
Second lens group 8 -27.48
Third lens group 16 63.00
4th lens group 21 -220.77
5th lens group 23 161.07

  The zoom optical system ZL3 according to the third example has an on-axis air gap d7 between the first lens group G1 and the second lens group G2, and the second lens group G2 when zooming from the wide-angle end state to the telephoto end state. And the third lens group G3, the on-axis air distance d15, the third lens group G3 and the fourth lens group G4, and the fourth lens group G4 and the fifth lens group G5. The air interval d22 changes. Table 10 below shows the values of the variable intervals and the back focus Bf in the wide-angle end state, the intermediate focal length state, and the telephoto end state in the infinity in-focus state.

(Table 10)
[Variable interval data]
Wide angle end Intermediate focal length Telephoto end f 102.00 200.00 294.00
d7 11.54 37.37 46.42
d15 28.30 15.09 3.09
d20 10.00 17.14 19.38
d22 24.82 5.07 5.78
Bf 56.17 56.17 56.17

  Table 11 below shows the focal length, the image stabilization coefficient, and the rotation blur in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system ZL3 at the time of focusing on infinity in the third embodiment. °] and lens group movement [mm].

(Table 11)
Focal length Anti-vibration coefficient Rotation blur Lens group movement Wide-angle end 102.0 -1.42 0.33 -0.409
Intermediate focal length 200.0 -1.42 0.23 -0.573
Telephoto end 294.0 -1.42 0.19 -0.694

  Table 12 below shows values corresponding to the conditional expressions in the third embodiment.

(Table 12)
(1) f1 / (− f2) = 3.9
(2) fw / f14w = 0.04
(3) f1 / f3 = 1.71
(4) (−f4) /f1=2.0
(5) (fw / f14w) / (ft / f14t) = 1.0

  Thus, the zoom optical system ZL3 according to the third example satisfies all the conditional expressions (1) to (5).

  FIGS. 12 to 15 show spherical aberrations in the wide-angle end state, the intermediate focal length state, and the telephoto end state when the variable magnification optical system ZL3 according to the third example is in focus at infinity and at close focus. The aberration diagrams of astigmatism, distortion, lateral chromatic aberration, and coma are shown. 12 to 14, (a) shows various aberrations in the infinite focus state, and (b) shows coma aberration when blur correction is performed by the lens group movement amount shown in Table 11 above. . FIG. 15 shows various aberrations in the short distance in-focus state. As is apparent from the respective aberration diagrams, in the third example, it is understood that various aberrations are favorably corrected from the wide-angle end state to the telephoto end state, and the imaging performance is excellent.

[Fourth embodiment]
FIG. 16 shows a lens configuration diagram and zoom locus of the variable magnification optical system ZL4 according to the fourth example. As shown in FIG. 16, the zoom optical system ZL4 according to the fourth example 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. And a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.

  The first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a positive meniscus lens L12 having a convex surface facing the object side, a biconvex lens L13, and a convex surface facing the object side. From the positive meniscus lens L14. 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 lens of a biconcave lens L22 and a biconvex lens L23, and a negative meniscus lens having a concave surface directed toward the object side. L24. The third lens group G3 includes, in order from the object side, a positive meniscus lens L31 having a concave surface facing the object side, and a cemented lens of a negative meniscus lens L32 having a convex surface facing the object side and a biconvex lens L33. The 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, a biconvex lens L51, a positive meniscus lens L52 with a convex surface facing the object side, a negative meniscus lens L53 with a convex surface facing the object side, and a positive surface with a convex surface facing the object side. A cemented lens with a meniscus lens L54, a cemented lens with a biconvex lens L55 and a biconcave lens L56, a negative meniscus lens L57 with a convex surface facing the object side, a biconvex lens L58, a positive meniscus lens L59 with a convex surface facing the object side, and It is composed of a negative meniscus lens L510 having a concave surface facing the object side. Thus, the variable magnification optical system ZL4 according to the fourth example includes at least one cemented lens in each of the first lens group G1, the second lens group G2, the third lens group G3, and the fifth lens group G5. It is comprised. The aperture stop S is disposed between the positive meniscus lens L54 and the biconvex lens L55 of the fifth lens group G5.

  In the zoom optical system ZL4 according to the fourth example having such a configuration, when zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group G1 and the second lens group G2 increases. The second lens group G2 moves toward the image plane side so that the distance between the second lens group G2 and the third lens group G3 decreases, and the third lens group G3 moves once toward the image plane side and then moves toward the object side. Then, the fourth lens group G4 moves to the image side so that the distance from the fifth lens group G5 decreases.

  In the variable magnification optical system ZL4 according to the fourth example, the third lens group G3 moves on the optical axis from the object side to the image side when focusing from an infinite object point to a close object point. To do.

  In the variable magnification optical system ZL4 according to the fourth example, the cemented lens of the biconvex lens L55 and the biconcave lens L56 of the fifth lens group G5, and the negative meniscus lens L57 having a convex surface facing the object side are antivibrated. By making the lens group G5vr and moving the anti-vibration lens group G5vr so as to include a component in a direction perpendicular to the optical axis, image plane correction at the time of occurrence of blurring is performed. Thus, the anti-vibration lens group G5vr has at least one positive lens and one negative lens.

  Table 13 below provides values of specifications of the variable magnification optical system ZL4 according to the fourth example. The surface numbers 1 to 40 shown in Table 13 correspond to the numbers 1 to 40 shown in FIG.

(Table 13)
[Overall specifications]
Wide-angle end state Intermediate focal length state Telephoto end state f = 102.0 to 200.0 to 294.0
FNO = 4.1 to 4.1 to 4.1
2ω = 24.0 to 12.2 to 8.3
Y = 21.6-21.6-21.6
TL = 281.49-281.49-281.49

[Lens data]
m r d νd nd
1 142.25 3.00 25.5 1.80518
2 89.07 10.00 82.6 1.49782
3 229.07 0.15
4 102.83 8.00 82.6 1.49782
5 2442.11 0.25
6 90.96 8.50 82.6 1.49782
7 307.48 d7
8 455.48 2.40 40.7 1.88300
9 39.92 6.38
10 -90.00 2.50 70.3 1.48749
11 43.44 6.00 23.8 1.84666
12 -459.63 7.66
13 -54.75 2.20 52.8 1.74100
14 555.51 d14
15 -176.01 5.00 70.3 1.48749
16 -59.96 0.29
17 70.55 2.94 27.6 1.75520
18 49.22 9.50 70.3 1.48749
19 -89.70 d19
20 -69.76 2.50 49.8 1.61772
21 -210.58 d21
22 57.60 7.00 70.3 1.48749
23 -423.50 0.10
24 45.35 5.00 70.3 1.48749
25 166.07 1.61
26 301.04 1.73 31.3 1.90366
27 48.20 5.00 82.6 1.49782
28 2126.16 2.50
29 0.00 11.45 Aperture stop S
30 78.07 5.00 27.6 1.75520
31 -56.53 1.53 52.8 1.74100
32 50.30 4.16
33 250.37 1.37 35.7 1.90265
34 49.98 5.39
35 56.79 4.30 58.8 1.51823
36 -143.80 0.20
37 68.85 4.00 41.0 1.58144
38 220.38 6.16
39 -34.54 2.41 40.7 1.88300
40 -60.28 Bf

[Lens focal length]
Lens group Start surface Focal length 1st lens group 1 119.08
Second lens group 8 -29.26
Third lens group 15 63.12
Fourth lens group 20 -170.03
5th lens group 22 121.57

  The zoom optical system ZL4 according to the fourth example has an on-axis air gap d7 between the first lens group G1 and the second lens group G2 and the second lens group G2 when zooming from the wide-angle end state to the telephoto end state. And the third lens group G3, the axial air gap d14 between the third lens group G3 and the fourth lens group G4, and the axial distance between the fourth lens group G4 and the fifth lens group G5. The air interval d21 changes. Table 14 below shows values of the variable intervals and the back focus Bf in the wide-angle end state, the intermediate focal length state, and the telephoto end state in the infinitely focused state.

(Table 14)
[Variable interval data]
Wide angle end Intermediate focal length Telephoto end f 102.00 200.00 294.00
d7 7.75 35.49 45.39
d14 26.63 14.35 3.05
d19 3.98 11.44 16.96
d21 29.39 6.47 2.35
Bf 67.54 67.54 67.54

  Table 15 below shows the focal length, the image stabilization coefficient, and the rotation blur in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system ZL4 when focusing on infinity in the fourth embodiment. °] and lens group movement [mm].

(Table 15)
Focal length Anti-vibration coefficient Rotation blur Lens group movement Wide-angle end 102.0 -1.60 0.33 -0.363
Intermediate focal length 200.0 -1.60 0.23 -0.508
Telephoto end 294.0 -1.60 0.19 -0.616

  Table 16 below shows values corresponding to the conditional expressions in the fourth embodiment.

(Table 16)
(1) f1 / (− f2) = 4.1
(2) fw / f14w = -0.20
(3) f1 / f3 = 1.89
(4) (−f4) /f1=1.4
(5) (fw / f14w) / (ft / f14t) = 1.0

  Thus, the zoom optical system ZL4 according to the fourth example satisfies all the conditional expressions (1) to (5).

  FIGS. 17 to 20 show spherical aberrations in the wide-angle end state, the intermediate focal length state, and the telephoto end state when the variable magnification optical system ZL4 according to the fourth example is in focus at infinity and at close focus. The aberration diagrams of astigmatism, distortion, lateral chromatic aberration, and coma are shown. 17 to 19, (a) shows various aberrations in the infinitely focused state, and (b) shows coma aberration when blur correction is performed by the lens group movement amount shown in Table 15 above. . FIG. 20 shows various aberrations in the short distance in-focus state. As is apparent from each aberration diagram, in the fourth example, it is understood that various aberrations are favorably corrected from the wide-angle end state to the telephoto end state, and the imaging performance is excellent.

[Fifth embodiment]
FIG. 21 shows the lens configuration and zoom locus of the variable magnification optical system ZL5 according to the fifth example. As shown in FIG. 21, the variable magnification optical system ZL5 according to the fifth example includes a first lens group G1 having a positive refractive power and a second lens group G2 having a negative refractive power in order from the object side. 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 a group G6.

  The first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a positive meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens having a convex surface facing the object side. 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 facing the object side, a cemented lens of a biconcave lens L22 and a positive meniscus lens L23 having a convex surface facing the object side, and the object side. And a negative meniscus lens L24 having a concave surface. The third lens group G3 includes, in order from the object side, a biconvex lens L31, and a cemented lens of a negative meniscus lens L32 having a convex surface facing the object side and a biconvex lens L33. The fourth lens group G4 is composed of a cemented lens of a biconcave lens L41 and a biconvex lens L42 in order from the object side. The fifth lens group G5 includes, in order from the object side, a biconvex lens L51, a positive meniscus lens L52 having a convex surface facing the object side, a cemented lens of the biconvex lens L53 and the biconcave lens L54, a biconvex lens L55, and a biconcave lens L56. A cemented lens, a biconcave lens L57, a biconvex lens L58, a negative meniscus lens L59 having a concave surface facing the object side, and a planoconvex lens L510 having a convex surface facing the object side. The sixth lens group G6 includes a negative meniscus lens L61 having a concave surface directed toward the object side. As described above, the variable magnification optical system ZL5 according to the fifth example includes at least one cemented lens in each of the first lens group G1, the second lens group G2, the third lens group G3, and the fifth lens group G5. It is comprised. The aperture stop S is disposed between the biconcave lens L54 and the biconvex lens L55 of the fifth lens group G5.

  In the zoom optical system ZL5 according to the fifth example having such a configuration, when zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group G1 and the second lens group G2 increases. The second lens group G2 moves toward the image plane side so that the distance between the second lens group G2 and the third lens group G3 decreases, and the third lens group G3 moves once toward the image plane side and then moves toward the object side. Then, the fourth lens group G4 once moves to the image plane side and then moves to the object side, and the sixth lens group G6 moves to the image side so that the distance between the fifth lens group G5 and the sixth lens group G6 increases. Moving.

  In the zoom optical system ZL5 according to Example 5, the third lens group G3 moves on the optical axis from the object side to the image side when focusing from an infinite object point to a short object point. To do.

  In the zoom optical system ZL5 according to the fifth example, the cemented lens of the biconvex lens L55 and the biconcave lens L56 of the fifth lens group G5, and the biconcave lens L57 are used as an antivibration lens group G5vr. By moving the lens group G5vr so as to include a component in a direction orthogonal to the optical axis, image plane correction at the time of occurrence of blurring is performed. Thus, the anti-vibration lens group G5vr has at least one positive lens and one negative lens.

  Table 17 below provides values of specifications of the variable magnification optical system ZL5 according to the fifth example. The surface numbers 1 to 43 shown in Table 17 correspond to the numbers 1 to 43 shown in FIG.

(Table 17)
[Overall specifications]
Wide-angle end state Intermediate focal length state Telephoto end state f = 102.0 to 200.0 to 294.0
FNO = 4.1 to 4.1 to 4.1
2ω = 24.0 to 24.0 to 24.0
Y = 21.6-21.6-21.6
TL = 280.05-280.05-280.05

[Lens data]
m r d νd nd
1 148.54 3.00 34.9 1.80 100
2 72.83 9.50 82.6 1.49782
3 622.37 0.15
4 84.83 7.00 82.6 1.49782
5 183.68 0.25
6 81.76 8.80 82.6 1.49782
7 1521.20 d7
8 278.00 2.40 46.6 1.81600
9 34.22 8.50
10 -156.53 2.50 70.3 1.48749
11 37.12 6.50 23.8 1.84666
12 243.91 6.44
13 -49.33 2.20 52.8 1.74100
14 -1295.87 d14
15 131.67 7.00 70.3 1.48749
16 -84.83 0.29
17 97.63 2.94 25.4 1.80518
18 49.31 9.30 63.9 1.51680
19 -102.87 d19
20 -60.95 1.80 82.6 1.49782
21 182.59 3.50 58.8 1.51823
22 -149.27 d22
23 46.58 7.00 82.6 1.49782
24 -1110.75 0.10
25 63.07 4.30 82.6 1.49782
26 585.57 0.93
27 53.78 4.60 70.3 1.48749
28 -220.47 2.00 35.7 1.90265
29 56.28 4.50
30 0.00 9.49 Aperture stop S
31 76.25 5.00 23.8 1.84666
32 -81.52 1.60 42.7 1.83481
33 35.32 5.00
34 -484.62 1.37 29.3 1.95000
35 194.10 4.13
36 56.93 5.00 52.2 1.51742
37 -62.83 6.67
38 -29.37 2.40 40.7 1.88300
39 -60.05 0.10
40 93.98 3.50 41.0 1.58144
41 0.00 d41
42 -70.66 2.00 70.3 1.48749
43 -109.39 Bf

[Lens focal length]
Lens group Start surface Focal length first lens group 1 109.02
Second lens group 8 -27.14
Third lens group 15 61.42
Fourth lens group 20 -222.97
Fifth lens group 23 138.29
6th lens group 42 -416.43

  The zoom optical system ZL5 according to the fifth example has an on-axis air gap d7 between the first lens group G1 and the second lens group G2 and the second lens group G2 when zooming from the wide-angle end state to the telephoto end state. And the third lens group G3, the axial air distance d14 between the third lens group G3 and the fourth lens group G4, the axial air distance between the fourth lens group G4 and the fifth lens group G5. d22, the axial air gap d41 between the fifth lens group G5 and the sixth lens group G6, and the back focus Bf change. Table 18 below shows values of variable intervals in the wide-angle end state, the intermediate focal length state, and the telephoto end state in the infinitely focused state.

(Table 18)
[Variable interval data]
Wide angle end Intermediate focal length Telephoto end f 102.00 200.00 294.00
d7 1.84 30.21 40.11
d14 25.93 14.13 3.32
d19 10.67 16.91 19.44
d22 28.63 5.82 2.45
d41 5.00 9.36 13.19
Bf 56.24 51.88 48.05

  Table 19 below shows the focal length, the image stabilization coefficient, and the rotation blur in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system ZL5 at the time of focusing on infinity in the fifth embodiment. °] and lens group movement [mm].

(Table 19)
Focal length Anti-vibration coefficient Rotation blur Lens group movement Wide-angle end 102.0 -1.53 0.33 -0.381
Intermediate focal length 200.0 -1.53 0.23 -0.532
Telephoto end 294.0 -1.54 0.19 -0.643

  Table 20 below shows values corresponding to the conditional expressions in the fifth embodiment.

(Table 20)
(1) f1 / (− f2) = 4.1
(2) fw / f14w = −0.01
(3) f1 / f3 = 1.77
(4) (−f4) /f1=2.0
(5) (fw / f14w) / (ft / f14t) = 0.47

  Thus, the zoom optical system ZL5 according to the fifth example satisfies all the conditional expressions (1) to (5).

  FIGS. 22 to 25 show spherical aberrations in the wide-angle end state, the intermediate focal length state, and the telephoto end state when the variable magnification optical system ZL5 according to the fifth example is in focus at infinity and at close focus. The aberration diagrams of astigmatism, distortion, lateral chromatic aberration, and coma are shown. 22 to 24, (a) shows various aberrations in the infinite focus state, and (b) shows coma aberration when blur correction is performed by the lens group movement amount shown in Table 19 above. . FIG. 25 shows various aberrations in the short distance in-focus state. As is apparent from the respective aberration diagrams, in the fifth example, it is understood that various aberrations are favorably corrected from the wide-angle end state to the telephoto end state, and the imaging performance is excellent.

ZL (ZL1 to ZL5) Variable magnification optical system G1 First lens group G2 Second lens group G3 Third lens group G4 Fourth lens group G5 Fifth lens group G5vr Anti-vibration lens group 1 Single-lens reflex camera (optical apparatus)

Claims (14)

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 group, and a fifth lens group having a positive refractive power,
During zooming from the wide-angle end state to the telephoto end state, the interval between adjacent lens groups changes, and the first lens group and the fifth lens group are fixed in the optical axis direction with respect to the image plane,
The fourth lens group includes one negative meniscus lens,
A variable magnification optical system characterized by satisfying the following condition:
3.9 <f1 / (− f2) <5.4
−0.3 <fw / f14w <0.2
However,
f1: Focal length of the first lens group f2: Focal length of the second lens group
f14w: Composite focal length of the first lens group, the second lens group, the third lens group, and the fourth lens group in the wide-angle end state
fw: focal length of the entire system in the wide-angle end state 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 group, and a fifth lens group having a positive refractive power,
During zooming from the wide-angle end state to the telephoto end state, the interval between adjacent lens groups changes, and the first lens group and the fifth lens group are fixed in the optical axis direction with respect to the image plane,
The fourth lens group includes one negative meniscus lens,
A variable magnification optical system characterized by satisfying the following condition:
3.9 <f1 / (− f2) <5.4
1.66 <f1 / f3 <3.00
However,
f1: Focal length of the first lens group f2: Focal length of the second lens group
f3: focal length of the third lens group 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 group, and a fifth lens group having a positive refractive power,
During zooming from the wide-angle end state to the telephoto end state, the interval between adjacent lens groups changes, and the first lens group and the fifth lens group are fixed in the optical axis direction with respect to the image plane,
The fourth lens group includes one negative meniscus lens,
A variable magnification optical system characterized by satisfying the following condition:
3.9 <f1 / (− f2) <5.4
1.2 <(− f4) / f1 <2.5
However,
f1: Focal length of the first lens group f2: Focal length of the second lens group
f4: focal length of the fourth lens group 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 group, and a fifth lens group having a positive refractive power,
During zooming from the wide-angle end state to the telephoto end state, the interval between adjacent lens groups changes, and the first lens group and the fifth lens group are fixed in the optical axis direction with respect to the image plane,
A variable magnification optical system characterized by satisfying the following condition:
3.7 <f1 / (− f2) <5.4
1.70 <f1 / f3 ≦ 1.94
However,
f1: Focal length of the first lens group f2: Focal length of the second lens group
f3: focal length of the third lens group 5. The variable magnification optical system according to claim 2, wherein a condition of the following formula is satisfied.
−0.3 <fw / f14w <0.2
However,
f14w: Composite focal length of the first lens group, the second lens group, the third lens group, and the fourth lens group in the wide-angle end state fw: Focal length of the entire system in the wide-angle end state 5. The variable magnification optical system according to claim 2, wherein a condition of the following formula is satisfied.
1.2 <(− f4) / f1 <2.5
However,
f4: focal length of the fourth lens group The variable power optical system according to claim 4 , wherein the fourth lens group includes one lens component. The zoom lens system according to any one of claims 1 to 7, wherein a condition of the following formula is satisfied.
0.3 <(fw / f14w) / (ft / f14t) <1.2
However,
f14w: Composite focal length of the first lens group, the second lens group, the third lens group, and the fourth lens group in the wide-angle end state f14t: The first lens group in the telephoto end state, the second The combined focal length of the lens group, the third lens group, and the fourth lens group fw: the focal length of the entire system in the wide-angle end state ft: the focal length of the entire system in the telephoto end state At least a part of the fifth lens group is an anti-vibration lens group that moves so as to include a component in a direction orthogonal to the optical axis;
The vibration reduction lens group is variable power optical system according to any one of claims 1-8, characterized in that it comprises a positive lens and a negative lens by at least one. Upon focusing, the third lens group, the variable magnification optical system according to any one of claims 1 to 9, characterized in that moves along the optical axis. The first lens group, the second lens group, the third lens group and each of said fifth lens group includes, in any one of claims 1 to 10, characterized in that it comprises at least one cemented lens The variable power optical system described. When zooming from the wide-angle end state to the telephoto end state,
The second lens group moves to the image plane side so that the distance between the second lens group and the third lens group decreases,
The variable magnification optical system according to any one of claims 1 to 11 , wherein the third lens group moves so that an interval between the third lens group and the fourth lens group changes. The variable magnification optical system according to claim 1, wherein all lens surfaces are spherical surfaces. An optical apparatus characterized by having a variable magnification optical system according to any one of claims 1 to 13.

Images