JPH1164728A - Zoom lens having camera shake correction function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a zoom lens having sufficient optical performance from infinity to a short distance, excellently compensating axial lateral chromatic aberration at the time of correcting camera shake while restraining a burden imposed on a driving means to the minimum and made compact without causing interference between mechanical parts for driving. SOLUTION: This zoom lens is provided with a 3rd group Gr3 having an aperture diaphragm S, a 2nd group Gr2 consisting of a focusing group GF and a 4th group Gr4 consisting of a camera shake correction group GB. Variable power is performed by changing intervals between respective zooming groups, focusing is performed by moving the entire 2nd group Gr2 along an optical axis, and camera shake correction is performed by decentering the entire 4th group Gr4 consisting of one combined lens.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens having a camera shake correction function, and more particularly, to a camera for photographing silver halide photography and video photography (moving picture photography,
The present invention relates to a zoom lens having a camera shake correction function, which is used in a camera for shooting still images.

[0002]

2. Description of the Related Art Various types of zoom lenses having a camera shake correction function have been proposed.
For example, in Japanese Patent Application Laid-Open No. Hei 7-27978, a part of the single lens constituting the fourth group of positive / negative / negative / positive or the cemented lens constituting the third group is moved with respect to the optical axis. A zoom lens that performs camera shake correction by moving the lens vertically has been proposed. In JP-A-5-224160, the fifth group of positive, negative, positive, positive, and negative is divided into two groups,
A zoom lens that performs camera shake correction by moving a part (composed of a plurality of lenses) has been proposed. In addition, the present applicant has proposed a zoom lens in which a single lens constituting a fourth group of positive, negative, positive, and positive moves for camera shake correction in Japanese Patent Application Laid-Open No. Hei 8-114771.

In the zoom lens proposed in Japanese Patent Application Laid-Open No. 7-27978, an aperture stop is provided in the fourth lens unit, which is disclosed in Japanese Patent Application Laid-Open Nos. 5-224160 and 8-1.
In the zoom lens proposed in 14771,
An aperture stop is provided in the third group. Further, neither of the above publications discloses a focusing method.

[0004]

Among the above-mentioned conventional zoom lenses, a zoom lens in which a camera shake correction group and an aperture stop exist in the same zoom group includes mechanical components for driving the diaphragm and camera shake correction drive. There is a problem that the mechanical parts interfere with each other. If you try to avoid this interference,
As a result, the entire zoom group including the mechanical components for driving is enlarged, and as a result, the compactness of the entire zoom lens is impaired, and the size of the camera is increased. The same applies when the focus group and the aperture stop are in the same zoom group or when the focus group and the camera shake correction group are in the same zoom group. Attempting to avoid interference with the mechanical parts for the camera will lead to an increase in the size of the camera.

In a zoom lens in which the camera shake correction group is composed of a single lens, the burden on the camera shake correction driving means is minimized, but it is possible to correct axial lateral chromatic aberration generated when eccentric driving is performed. There is a problem that can not be. Furthermore, some zoom lenses for which the focusing method is not specified have a camera shake correction function, but it is difficult to ensure image performance for a close-range object because there is no appropriate focus solution. I do.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and a first object of the present invention is to provide a device having sufficient optical performance from infinity photography to short-range photography and having a plurality of driving mechanical parts. It is an object of the present invention to provide a zoom lens having a camera shake correction function, which can achieve compactness without causing interference. A second object of the present invention is to be able to satisfactorily correct axial lateral chromatic aberration at the time of camera shake correction while minimizing the load on the camera shake correction drive unit, and to cause interference between drive mechanical components. It is an object of the present invention to provide a zoom lens having a camera shake correction function that can achieve compactness without using a camera.

[0007]

In order to achieve the first object, a zoom lens having a camera shake correction function according to a first aspect of the present invention includes a first zoom group having an aperture stop and an object which is larger than the first zoom group. The zoom lens includes a second zoom group located on the image side and a third zoom group located on the image side of the first zoom group, and performs zooming by changing the interval between the zoom groups. Focusing is performed by moving the whole or part of the second zoom group along the optical axis, and camera shake correction is performed by decentering the whole or part of the third zoom group.

According to a second aspect of the present invention, there is provided a zoom lens having a camera shake correction function according to the first aspect, wherein the first zoom group and the third zoom group are adjacent to each other. It is characterized by having.

According to a third aspect of the present invention, there is provided a zoom lens having a camera shake correction function according to the first aspect of the present invention, wherein the first zoom group and the second zoom group are adjacent to each other. It is characterized by having.

In order to achieve the first object, a zoom lens having a camera shake correction function according to a fourth aspect of the present invention is the zoom lens according to the first aspect of the present invention, wherein the whole or a part of the third zoom group is moved with respect to the optical axis. The camera shake is corrected by moving in the vertical direction.

In order to achieve the first object, a zoom lens having a camera shake correction function according to a fifth aspect of the present invention is the zoom lens according to the first aspect of the present invention, wherein the entire third zoom group decentered for the camera shake correction or A part is a camera shake correction group including one single lens or one cemented lens.

In order to achieve the second object, a zoom lens having a camera shake correction function according to a sixth aspect of the present invention is a second zoom group including a first zoom group having an aperture stop and a focus group moving for focusing. And a third zoom group including a camera shake correction group that moves for camera shake correction, each of which independently includes a zoom lens that performs zooming by changing the interval between the zoom groups. It is characterized by comprising one cemented lens.

According to a seventh aspect of the present invention, there is provided a zoom lens having a camera shake correction function according to the sixth aspect, wherein the first zoom group and the third zoom group are adjacent to each other. It is characterized by having.

In order to achieve the second object, a zoom lens having a camera shake correction function according to an eighth aspect of the present invention is the zoom lens according to the sixth aspect, wherein the first zoom group and the second zoom group are adjacent to each other. It is characterized by having.

According to a ninth aspect of the present invention, there is provided a zoom lens having a camera shake correction function according to the ninth aspect of the present invention, wherein the whole or a part of the third zoom group is moved with respect to an optical axis. The camera shake is corrected by moving in the vertical direction.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A zoom lens having a camera shake correction function according to the present invention will be described below with reference to the drawings. FIGS. 1, 8, and 15 are lens configuration diagrams corresponding to the zoom lenses of the first, second, and third embodiments, respectively, and show the lens arrangement at the wide-angle end [W]. Arrows mi (i = 1, 2, 3,...) In each lens configuration diagram schematically show the movement of the i-th lens unit (Gri) during zooming from the wide-angle end [W] to the telephoto end [T]. Is shown in Also, in each lens configuration diagram, the surface with ri (i = 1, 2, 3, ...) is counted from the object side as i
The third surface, the surface marked with * for ri, is an aspheric surface. The axial top surface interval between the groups to which di (i = 1, 2, 3,...) is a variable interval that changes during zooming, of the i-th axial top surface interval counted from the object side. The arrow mD in the lens configuration diagram represents the parallel eccentricity of the camera shake correction group (that is, the movement in the direction perpendicular to the optical axis), and the arrow mF represents the focus movement of the focus group.

The zoom lens according to the first embodiment has, in order from the object side, a first group (Gr1) having a positive power, a second group (Gr2) having a negative power, and a positive group. The zoom lens includes a third lens unit (Gr3), a fourth lens unit (Gr4) having positive power, and a fifth lens unit (Gr5) having negative power. Then, as shown by arrows m1 to m5 in FIG. 1, at the time of zooming from the wide-angle end [W] to the telephoto end [T], the distance between the first unit (Gr1) and the second unit (Gr2) increases. , 2nd group (Gr2) and 3rd group
The distance between (Gr3) and the third group (Gr3) and the fourth group (Gr4)
Are moved so that the distance between the fourth group (Gr4) and the fifth group (Gr5) becomes narrow. The second group (G
An aperture stop (S) that zooms together with the third lens unit (Gr3) between the most image-side surface of r2) and the most object-side surface of the third lens unit (Gr3).
Is arranged.

In the first embodiment, each group is configured as follows in order from the object side. First group (Gr1)
Is composed of a cemented lens of a negative meniscus lens convex on the object side and a biconvex positive lens, and a positive meniscus lens convex on the object side. The second group (Gr2) includes a negative meniscus lens convex on the object side, a biconcave negative lens, a biconvex positive lens, and a negative meniscus lens concave on the object side. The third group (Gr3) includes a biconvex positive lens, a positive meniscus lens convex on the object side, and a negative meniscus lens convex on the object side. The fourth unit (Gr4) includes a cemented lens composed of a biconvex positive lens and a negative meniscus lens convex on the image side. The fifth unit (Gr5) includes a positive meniscus lens convex on the image side, a negative meniscus lens concave on the object side,
It is composed of

In the first embodiment, the second group (Gr2) is the focus group (GF), and the fourth group (Gr4) is the camera shake correction group (Gr).
B). That is, as indicated by the arrow mF (FIG. 1), the second group
By moving (Gr2) to the object side along the optical axis,
Focusing is performed from an object at infinity to an object at a short distance, and the entire fourth unit (Gr4) is eccentrically moved in a direction perpendicular to the optical axis as shown by an arrow mD (FIG. 1). Thus, the camera shake correction is performed.

The zoom lens according to the second embodiment has, in order from the object side, a first lens unit (Gr1) having positive power, a second lens unit (Gr2) having negative power, and a positive lens. The zoom lens includes a third lens unit (Gr3) and a fourth lens unit (Gr4) having negative power. Then, as shown by arrows m1 to m4 in FIG. 8, at the time of zooming from the wide-angle end [W] to the telephoto end [T], the distance between the first lens unit (Gr1) and the second lens unit (Gr2) increases. The distance between the second group (Gr2) and the third group (Gr3) is reduced, and the third group (Gr3)
Each group moves so that the distance between r3) and the fourth group (Gr4) becomes narrow. The most image-side surface of the second group (Gr2) and the third group (Gr2)
An aperture stop (S) that zooms together with the third lens unit (Gr3) is arranged between the third lens unit (Gr3) and the surface closest to the object in 3).

In the second embodiment, each group is configured as follows in order from the object side. First group (Gr1)
Is composed of a cemented lens of a negative meniscus lens convex on the object side and a biconvex positive lens, and a positive meniscus lens convex on the object side. The second group (Gr2) includes a negative meniscus lens convex on the object side, a biconcave negative lens, a biconvex positive lens, and a biconcave negative lens. 3rd group (Gr
3) is composed of a biconvex positive lens, a positive meniscus lens convex on the object side, and a negative meniscus lens convex on the object side. The fourth group (Gr4) includes a cemented lens of a biconvex positive lens and a negative meniscus lens convex on the image side, a positive meniscus lens convex on the image side, and a negative meniscus lens concave on the object side. .

In the second embodiment, the second group (Gr2) is the focus group (GF), and the cemented lens forming a part of the fourth group (Gr4) is the camera shake correction group (Gb). That is, as shown by an arrow mF (FIG. 1), the second unit (Gr2) is moved to the object side along the optical axis, thereby performing focusing from an object at infinity to an object at a short distance. , Also the arrow mD
As shown in (FIG. 1), the camera shake correction is performed by eccentrically moving the camera shake correction group (Gb), which constitutes a part of the fourth group (Gr4), in the direction perpendicular to the optical axis. I have.

The zoom lens according to the third embodiment has, in order from the object side, a first group (Gr1) having positive power, a second group (Gr2) having negative power, and a positive group. The zoom lens includes a third lens unit (Gr3), a fourth lens unit (Gr4) having positive power, and a fifth lens unit (Gr5) having negative power. Then, as shown by arrows m1 to m5 in FIG.
Group (Gr1) during zooming from the camera to the telephoto end [T]
The distance between the second group (Gr2) and the third group (Gr2)
The distance between the group (Gr3) and the third group (Gr3) and the fourth group (Gr3)
Each group moves so that the distance between the fourth group (Gr4) and the fifth group (Gr5) becomes narrower. The second group
Between the most image-side surface of (Gr2) and the most object-side surface of the third lens unit (Gr3), an aperture stop that zooms together with the third lens unit (Gr3)
(S) is arranged.

In the third embodiment, each group is configured as follows in order from the object side. First group (Gr1)
Is composed of a cemented lens of a negative meniscus lens convex on the object side and a positive meniscus lens concave on the image side, and a positive meniscus lens convex on the object side. The second group (Gr2) includes a negative meniscus lens convex on the object side, a biconcave negative lens,
It is composed of a biconvex positive lens, a negative meniscus lens concave on the object side, and a positive meniscus lens convex on the object side. The third unit (Gr3) includes two biconvex positive lenses and a biconcave negative lens. The fourth unit (Gr4) includes a cemented lens composed of a biconvex positive lens and a negative meniscus lens convex on the image side. The fifth unit (Gr5) includes a positive meniscus lens convex on the image side and a negative meniscus lens concave on the object side.

In the third embodiment, four lenses (r6 to r13) forming a part of the second group (Gr2) are the focus group (Gf), and the fourth group (Gr4) is the camera shake correction group (Gr2). GB). That is,
As shown by an arrow mF (FIG. 15), the focus group (Gf) constituting a part of the second group (Gr2) is moved toward the object side along the optical axis, so that an object at infinity can be moved to a close object. Focusing is performed, and the arrow mD (FIG. 1)
As shown in 5), the entire fourth lens unit (Gr4) is eccentrically moved in a direction perpendicular to the optical axis to perform camera shake correction.

As described above, in the first to third embodiments,
A zoom lens that performs zooming by changing the distance between zoom groups, wherein the whole (GF) or a part (Gf) of the second group (Gr2) located closer to the object side than the third group (Gr3) Focusing is performed by moving the optical system along the optical axis.
The camera shake correction is performed by decentering the whole (GB) or a part (Gb) of the fourth lens unit (Gr4) located closer to the image side than r3). Thus, at least three zoom groups (Gr2
~ Gr4), and according to the configuration in which zooming is performed by changing the interval between the groups, the degree of freedom in zooming is increased, and it is possible to realize a zoom lens with a high zoom ratio while maintaining high optical performance. it can.

In general, different driving means are required for driving for camera shake correction, driving of the aperture stop, and driving of the focus group. For example, when the camera shake correction group and the aperture stop exist in the same zoom group, it is necessary to arrange each driving mechanical component around one lens holding member.
If this arrangement is performed so that the two driving mechanical parts do not physically interfere with each other, the entire zoom group including the driving mechanical parts becomes large as described above, and as a result, the entire zoom lens becomes large. The compactness of the camera is impaired, and the camera becomes larger. Further, not only the arrangement of the driving mechanical parts but also the arrangement of the means for supplying electric power to the driving means are complicated, which is not preferable.

In order to solve the problem caused by the interference between the driving mechanical parts, the camera shake correction group, the aperture stop, and the focus group are independently set to the zoom group as in the first to third embodiments. It is desirable to arrange them separately. If the camera shake correction group, the aperture stop, and the focus group are separately arranged in independent zoom groups, the driving mechanical components are separately arranged in independent zoom groups. As a result, the size of each zoom group and the difficulty of designing each driving mechanical component are reduced, so that the entire zoom lens including the driving unit is made compact without causing interference between the driving mechanical components. It becomes possible.

In the case of the first to third embodiments, the first zoom group (GA) having the aperture stop (S) and the movement of the whole (GF) or part (Gf) along the optical axis The above-described configuration is realized by providing a second zoom group (GF) that performs focusing by using a third zoom group (GB) that performs camera shake correction by parallel eccentricity of the whole (GB) or a part (Gb). ing. In each embodiment, the third group (Gr3) corresponds to the first zoom group (GA), the second group (Gr2) corresponds to the second zoom group (GF), and the fourth group (Gr2) corresponds to the fourth group. The group (Gr4) corresponds to the third zoom group (GB).

In the first to third embodiments, the first
The second lens group is closer to the object side than the third lens group (Gr3), which is the zoom lens group (GA).
A second group (Gr2) that is a zoom group (GF) is disposed, and a fourth group that is a third zoom group (GB) is located closer to the image side than the third group (Gr3) that is the first zoom group (GA). (Gr4) is arranged. Accordingly, in order from the object side, the focus group (GF or Gf), the aperture stop (S), and the camera shake correction group (GB or Gb) are arranged. With this configuration, it is possible to minimize the camera shake correction group and the focus group, and to obtain a good camera shake correction effect from infinity shooting to close-range shooting. This will be described in more detail.

First, when the focus group (GF or Gf) is closer to the object side than the camera shake correction group (GB or Gb), the object distance to the lens group closer to the image than the focus group (GF or Gf) is. Is constant regardless of focusing. That is,
Since the magnification of the camera shake correction group (GB or Gb) is constant irrespective of focusing, variation in aberration up to the camera shake correction group (GB or Gb) is reduced. Therefore, since the effect of camera shake correction does not depend on the object distance, a sufficient camera shake correction effect can be obtained from infinity shooting to close-range shooting.

Second, since the light beams are densely gathered near the aperture stop (S), the first zoom group (GA) having the aperture stop (S)
And a third zoom group (G
B) is adjacent to the image stabilization group (GB or G
The lens diameter of b) can be reduced. This allows
Since the weight of the camera shake correction group (GB or Gb) can be reduced, the load on the camera shake correction drive unit can be reduced, and the size of the camera shake correction drive unit can be reduced.

Third, since the light beams are gathered densely near the aperture stop (S), the first zoom group (GA) having the aperture stop (S)
And a second zoom group (G) constituting a focus group (GF or Gf).
F) is adjacent to the focus group (GF or G
f) The lens diameter can be reduced. This allows
Since the weight of the focus group (GF or Gf) can be reduced, the load on the focus driving unit can be reduced, and the size of the focus driving unit can be reduced.

As can be seen from the above three points, the camera shake correction group (GB or Gb) and the focus group (GF or Gf) are minimized, and a good camera shake correction effect is obtained from infinity shooting to close-range shooting. For this purpose, as in the first to third embodiments, the focus group (GF or Gf), the aperture stop (S), and the camera shake correction group (GB or Gb) may be arranged in this order from the object side. It is desirable.

In the case where the camera shake correction is performed by inclining the camera shake correction group with respect to the optical axis, the camera shake correction drive means has an axis at the center of rotation. For this reason, as the rotation center moves away from the camera shake correction group, the camera shake correction driving unit increases in the optical axis direction. On the other hand,
When the camera shake correction is performed by moving the camera shake correction group (GB or Gb) in the direction perpendicular to the optical axis as in the third embodiment, the camera shake correction driving means can be made relatively simple and compact. Can be configured.

In the case where the camera shake correction group is composed of one single lens, the number of constituent lenses is minimal, so that the load on the camera shake correction driving means can be minimized. However, when the camera shake correction group is decentered, it is impossible to perform color correction using a single lens alone, so that it is not possible to correct axial lateral chromatic aberration generated at the time of decentering. Further, it is not preferable to configure the camera shake correction group with a plurality of lenses in order to correct the chromatic aberration of the camera shake correction group because the load on the camera shake correction driving unit increases. Therefore,
As in the third embodiment, it is desirable to form a camera shake correction group (GB or Gb) with one cemented lens. If the camera shake correction group is composed of one cemented lens, it is possible to correct the axial lateral chromatic aberration at the time of camera shake correction and to minimize the load on the camera shake correction drive unit.

When the camera shake correction group is composed of one cemented lens as described above, the on-axis optical path length of the camera shake correction group becomes minimum. In this case, for example, even if the focus group, the camera shake correction group, and the aperture stop are arranged in this order from the object side, the on-axis optical path length from the focus group to the aperture stop does not widen so much. The effective diameter of remains small. Therefore, when the camera shake correction group is configured by one cemented lens, if the focus group, the camera shake correction group, and the aperture stop are included in the independent zoom group, respectively, the above-described first to third embodiments will be described. Similar effects can be obtained.

Each of the zoom units constituting the first to third embodiments is composed of only a refraction type lens which deflects an incident light beam by refraction, but is not limited to this.
For example, each zoom group may be configured by a diffractive lens that deflects an incident light beam by diffraction, a refraction / diffraction hybrid lens that deflects an incident light beam by a combination of a diffraction action and a refraction action, or the like.

[0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A zoom lens having a camera shake correction function according to the present invention will be described more specifically with reference to construction data, aberration diagrams, and the like. Examples 1 to 3 given here as examples correspond to the above-described first to third embodiments, respectively, and FIGS. 1, 8, and 15 showing the first to third embodiments correspond to FIGS. 3 shows lens configurations at the wide-angle end [W] of Examples 1 to 3, respectively.

In the construction data of each embodiment, ri (i = 1, 2, 3,...) Is the radius of curvature of the i-th surface counted from the object side, and di (i = 1, 2, 3,. ..) is the i-th shaft upper surface distance counted from the object side (shown here before the eccentricity), which is changed by zooming (variable space).
Is the actual surface distance between the groups at the wide-angle end [W] to the intermediate focal length state [M] to the telephoto end [T]. Also, Ni (i = 1,2,
3, ...) and νi (i = 1,2,3, ...) are the refractive index (Nd) and Abbe number (νd) for the d-line of the i-th lens counted from the object side.
It is. The focal length f and F number FNO of the entire system corresponding to each focal length state [W], [M], [T] are shown together with the construction data.

Further, the surface marked with * for the radius of curvature ri is:
It indicates that the surface is constituted by an aspherical surface, and is defined by the following expression (AS) representing the surface shape of the aspherical surface. The aspherical surface data of each aspherical surface is shown together with other data. X = (C · Y ² ) / {1 + √ (1-ε · Y ² · C ² )} + Σ (Ai · Y ⁱ ) (AS) where, in the equation (AS), X: the optical axis direction The displacement amount from the reference plane, Y: height in the direction perpendicular to the optical axis, C: paraxial curvature, ε: second-order surface parameter, Ai: i-th order aspherical coefficient.

Example 1 (Positive / Negative / Positive / Positive / Negative)

[Aspherical surface data of the sixth surface (r6)] ε = 1.0000 A4 = 0.83645 300 × 10 ^-5 A6 = 0.67353100 × 10 ^-7 A8 = -0.10566100 × 10 ^-8 A10 = 0.51276 200 × 10 ^-11 A12 = 0.88135000 × 10 ^-15

[Aspherical surface data of the nineteenth surface (r19)] ε = 1.0000 A4 = -0.39985900 × 10 ^-4 A6 = 0.21782000 × 10 ^-6 A8 = 0.95114000 × 10 ^-9 A10 = -0.20385600 × 10 ^-10 A12 = -0.29974600 × 10 ^-12

[Aspherical surface data of the twentieth surface (r20)] ε = 1.0000 A4 = 0.77224600 × 10 ^-4 A6 = 0.72183200 × 10 ^-6 A8 = 0.51068600 × 10 ^-8 A10 = 0.42389 400 × 10 ^-10 A12 = -0.73088800 × 10 ^-12

[Aspherical surface data of the 24th surface (r24)] ε = 1.0000 A4 = -0.45652900 × 10 ^-4 A6 = -0.51530 100 × 10 ^-6 A8 = -0.52845 600 × 10 ^-8 A10 = 0.41459 300 × 10 ^-10 A12 = -0.71354200 × 10 ^-12

[Aspherical surface data of the 25th surface (r25)] ε = 1.0000 A4 = -0.34438900 × 10 ^-4 A6 = -0.52934900 × 10 ^-6 A8 = 0.50113400 × 10 ^-9 A10 = -0.43265 700 × 10 ^-10 A12 = -0.20027900 × 10 ^-14

<< Embodiment 2 (positive / negative / positive / negative) >>

[Aspherical surface data of sixth surface (r6)] ε = 1.0000 A4 = 0.84449900 × 10 ^-5 A6 = 0.63551500 × 10 ^-8 A8 = 0.20154300 × 10 ^-11 A10 = -0.14396 400 × 10 ^-12 A12 = 0.17773000 × 10 ^-14

[Aspherical surface data of the nineteenth surface (r19)] ε = 1.0000 A4 = -0.40326000 × 10 ^-4 A6 = 0.26710500 × 10 ^-6 A8 = 0.12593500 × 10 ^-8 A10 = -0.19817 800 × 10 ^-10 A12 = -0.47458 300 × 10 ^-12

[Aspherical surface data of the twentieth surface (r20)] ε = 1.0000 A4 = 0.82195 200 × 10 ^-4 A6 = 0.74794 100 × 10 ^-6 A8 = 0.70469000 × 10 ^-8 A10 = 0.24450 700 × 10 ^-10 A12 = -0.47794400 × 10 ^-12

[Aspherical surface data of the 24th surface (r24)] ε = 1.0000 A4 = -0.51552400 × 10 ^-4 A6 = -0.42163600 × 10 ^-6 A8 = -0.18955400 × 10 ^-8 A10 = 0.71695600 × 10 ^-10 A12 = -0.17765700 × 10 ^-11

[Aspherical surface data of the 25th surface (r25)] ε = 1.0000 A4 = -0.32518400 × 10 ^-4 A6 = -0.37081400 × 10 ^-6 A8 = 0.25625300 × 10 ^-8 A10 = -0.42716 300 × 10 ^-10 A12 = -0.31376 100 × 10 ^-12

<< Embodiment 3 (positive / negative / positive / positive / negative) >>

[Aspherical surface data of the sixth surface (r6)] ε = 1.0000 A4 = 0.66392800 × 10 ^-5 A6 = -0.35561500 × 10 ^-7 A8 = 0.28951400 × 10 ^-9 A10 = -0.11033500 × 10 ^-11 A12 = 0.54879700 × 10 ^-14

[Aspherical surface data of the 21st surface (r21)] ε = 1.0000 A4 = 0.59076200 × 10 ^-4 A6 = 0.82572900 × 10 ^-6 A8 = -0.12752000 × 10 ^-7 A10 = -0.87916000 × 10 ^-10 A12 = 0.15020400 × 10 ^-11

[Aspherical surface data of the 22nd surface (r22)] ε = 1.0000 A4 = 0.19223400 × 10 ^-3 A6 = 0.43866100 × 10 ^-6 A8 = 0.59818500 × 10 ^-7 A10 = -0.16565500 × 10 ^-8 A12 = 0.15712800 × 10 ^-10

[Aspherical surface data of the 26th surface (r26)] ε = 1.0000 A4 = -0.10553800 × 10 ^-3 A6 = -0.10910900 × 10 ^-5 A8 = 0.43503400 × 10 ^-7 A10 = -0.82295000 × 10 ^-9 A12 = 0.40413 400 × 10 ^-11

[Aspherical surface data of the 27th surface (r27)] ε = 1.0000 A4 = -0.69947800 × 10 ^-4 A6 = -0.87885400 × 10 ^-6 A8 = 0.29904700 × 10 ^-7 A10 = -0.50361 200 × 10 ^-9 A12 = 0.20882900 × 10 ^-11

FIG. 2, FIG. 3, FIG. 9, FIG. 10, FIG. 16, FIG.
FIG. 7 shows the aberration performance of each embodiment before decentering (normal state). 2, 9, and 16 are longitudinal aberration diagrams of Examples 1 to 3 before decentering (normal state) and in an infinity shooting state.
FIGS. 3, 10 and 17 show the first to third embodiments before eccentricity.
FIG. 4 is a longitudinal aberration diagram in a close-up shooting state (a shooting distance of 1 m). 9, FIG. 9, FIG. 10, FIG. 16 and FIG. 17, [W] is a wide-angle end, [M] is an intermediate focal length state (middle), and [T] is various aberrations at a telephoto end (from the left). In order, spherical aberration, astigmatism,
Distortion; Y ': image height), the solid line (d) represents the aberration with respect to the d-line, the dashed line (SC) represents the sine condition, and the dashed line (DM)
And a solid line (DS) represent astigmatism with respect to the d-line on the meridional surface and the sagittal surface, respectively.

FIGS. 4 to 7, FIGS. 11 to 14, and FIGS. 18 to 21 show the aberration performance of each embodiment before eccentricity (normal state) and after eccentricity (camera shake correction state). 4 and 5; FIG.
FIGS. 12 and 18 are transverse aberration diagrams on the meridional surface before and after eccentricity, at infinity, and in FIGS. 6 and 7; FIGS. FIG. 7 is a lateral aberration diagram before and after decentering, in a close-up shooting state, and on a meridional surface in each embodiment. 4 to 7 show the first embodiment and FIGS.
4 corresponds to the second embodiment, and FIGS. 18 to 21 correspond to the third embodiment, respectively. FIGS. 4, 6; FIGS. 11, 13; 7, FIG. 12, FIG. 14; FIG.
9 and FIG. 21 correspond to the telephoto end [T], respectively. 4 to 7, FIG. 11 to FIG. 14, and FIG.
[A] is the lateral aberration at the image height Y '= + 12,0, -12 in the camera shake correction state of 0.7 degrees {the camera shake correction angle θ of the camera shake correction group θ = 0.7 ° (= 0.0122173 rad)}. FIG. 3B is a lateral aberration diagram at an image height Y ′ = + 12,0 in a normal state.

Table 1 shows the off-axis image point movement error and the on-axis lateral chromatic aberration in each embodiment in the 0.7-degree camera shake correction state. In Table 1, [W] is the wide-angle end, [M] is the intermediate focal length state.
(Middle), [T] is the off-axis image point movement error at the telephoto end (mm)
And on-axis lateral chromatic aberration (mm), and the value in each focal length state is, in order from the top, the image height Y ′ on the meridional surface.
= 12mm (+12,0), Image height on meridional plane Y '=-12
mm (-12,0), image height on sagittal plane Y '= 12mm {(0, + 1
2); The minus side appears symmetrically with the plus side. }. Further, the value of the on-axis lateral chromatic aberration represents the difference between the values of the d-line and the g-line.

[0063]

[Table 1]

[0064]

As described above, according to the first to ninth aspects of the present invention, the respective driving mechanical parts are arranged separately in independent zoom groups, so that the interference between the driving mechanical parts is achieved. The compactness can be achieved without causing the problem. According to the first to fifth aspects, since focusing is performed in front of the aperture stop and camera shake correction is performed behind the aperture stop, sufficient optical performance is obtained from infinity shooting to short-range shooting. Can be obtained. According to the sixth to ninth aspects, since the camera shake correction group is composed of one cemented lens, the load on the camera shake correction drive unit can be minimized, and the axial lateral chromatic aberration at the time of camera shake correction can be improved. Can be corrected.

[Brief description of the drawings]

FIG. 1 is a lens configuration diagram of a first embodiment (Example 1).

FIG. 2 is a longitudinal aberration diagram of Example 1 in an infinity shooting state before decentering.

FIG. 3 is a longitudinal aberration diagram in a close-up shooting state before decentering according to the first embodiment.

FIG. 4 is a meridional lateral aberration diagram before and after decentering, at a wide-angle end, and at infinity, according to the first embodiment.

FIG. 5 is a meridional lateral aberration diagram before and after eccentricity, at a telephoto end, and at infinity in the first embodiment.

FIG. 6 is a meridional lateral aberration diagram before and after decentering, at a wide-angle end, and in a close-up shooting state according to the first embodiment.

FIG. 7 is a meridional lateral aberration diagram before and after decentering, at a telephoto end, and in a close-up shooting state according to the first embodiment.

FIG. 8 is a lens configuration diagram of a second embodiment (Example 2).

FIG. 9 is a longitudinal aberration diagram of Embodiment 2 in an infinity shooting state before decentering.

FIG. 10 is a longitudinal aberration diagram of Example 2 in a short-distance shooting state before decentering.

FIG. 11 is a meridional lateral aberration diagram before and after decentering, at a wide-angle end, and at infinity in Example 2;

FIG. 12 is a meridional lateral aberration diagram before and after decentering, at a telephoto end, and at infinity in Example 2;

FIG. 13 is a meridional lateral aberration diagram before and after eccentricity, at a wide-angle end, and in a close-up shooting state in Example 2.

FIG. 14 is a meridional lateral aberration diagram before and after decentering, at a telephoto end, and in a close-up shooting state according to the second embodiment.

FIG. 15 is a diagram illustrating a lens configuration according to a third embodiment (Example 3).

FIG. 16 is a longitudinal aberration diagram of Embodiment 3 in an infinity shooting state before decentering.

FIG. 17 is a longitudinal aberration diagram of Example 3 in a close-up shooting state before decentering.

FIG. 18 is a meridional lateral aberration diagram before and after decentering, at the wide-angle end, and at infinity in Example 3;

FIG. 19 is a meridional lateral aberration diagram before and after eccentricity, at a telephoto end, and at infinity in Example 3;

FIG. 20 is a meridional lateral aberration diagram before and after decentering, at a wide-angle end, and in a close-up shooting state according to the third embodiment.

FIG. 21 is a meridional lateral aberration diagram before and after eccentricity, at a telephoto end, and in a close-up shooting state in Example 3.

[Explanation of symbols]

 Gr1 ... first group Gr2 ... second group (second zoom group) Gr3 ... third group (first zoom group) Gr4 ... fourth group (third zoom group) Gr5 ... fifth group GF ... second zoom group ( Focus group) Gf: Focus group GA: First zoom group S: Aperture stop GB: Third zoom group (camera shake correction group) Gb: Camera shake correction group GR: Final group

Claims (9)

[Claims] A first zoom group having an aperture stop; a second zoom group located closer to the object side than the first zoom group;
A third zoom group located closer to the image side than the first zoom group, wherein zooming is performed by changing the interval between the zoom groups, and the entire zoom lens or one of the second zoom groups is changed. A zoom lens having a camera shake correction function, wherein focusing is performed by moving the unit along the optical axis, and camera shake correction is performed by decentering the whole or a part of the third zoom group. 2. The zoom lens having a camera shake correction function according to claim 1, wherein said first zoom group and said third zoom group are adjacent to each other. 3. The zoom lens having a camera shake correction function according to claim 1, wherein said first zoom group and said second zoom group are adjacent to each other. 4. The zoom lens having a camera shake correction function according to claim 1, wherein camera shake correction is performed by moving the whole or a part of said third zoom group in a direction perpendicular to an optical axis. 5. The camera shake correction group according to claim 1, wherein the whole or a part of the third zoom group decentered for the camera shake correction is a single lens or a single cemented lens. A zoom lens having the image stabilization function described in the above. 6. A first zoom group having an aperture stop, a second zoom group including a focus group moving for focusing, and a third zoom group including a camera shake correction group moving for camera shake correction. What is claimed is: 1. A zoom lens having a camera shake correction function, wherein the zoom lens is independently provided and changes the magnification by changing the interval between the zoom groups, wherein the camera shake correction group includes one cemented lens. 7. The zoom lens having a camera shake correction function according to claim 6, wherein said first zoom group and said third zoom group are adjacent to each other. 8. The zoom lens having a camera shake correction function according to claim 6, wherein said first zoom group and said second zoom group are adjacent to each other. 9. The zoom lens having a camera shake correction function according to claim 6, wherein camera shake correction is performed by moving the whole or a part of said third zoom group in a direction perpendicular to an optical axis.