JP2021009217A - Zoom lens and imaging device - Google Patents

Abstract

To provide a zoom lens which is compact and has good optical performance and an imaging device equipped with the same.SOLUTION: Provided is a zoom lens comprising, in order from the object side, a positive first lens group, a negative second lens group, and a Gr group which is positive as the whole, the Gr group comprising a Grf group, a negative Grm group and a Grr group in order from the object side. While zooming, the interval between the first lens group and the second lens group and the interval between the second lens group and the Gr group change; while zooming and/or focusing, the interval between the Grf group and the Grm group and the interval between the Grm group and the Grr group change, the Grf group including a Grf convex lens arranged on the most object side of the Grf group and at least one Grf concave lens and satisfying a prescribed conditional expression.SELECTED DRAWING: Figure 1

Description

The present invention relates to a zoom lens and an imaging device including the zoom lens.

In recent years, in image pickup devices using solid-state image sensors such as digital cameras and video cameras, the number of pixels of solid-state image sensors has been increasing, and the imaging optical system is required to have higher performance than before. Further, with the miniaturization of the image pickup apparatus, there is an increasing demand for miniaturization of the imaging optical system.

Under such circumstances, the following zoom lenses are disclosed in publicly known documents.
Patent Document 1 discloses a zoom lens for a so-called digital single-lens reflex camera and a video camera. In the zoom lens of Patent Document 1, the entire second lens group moves on the optical axis at the time of focusing. However, since the diameter of the second lens group is large and the number of lenses constituting the second lens group is large, the drive mechanism of the focus lens group becomes large, and the miniaturization of the image pickup apparatus cannot be sufficiently realized. ..

Patent Document 2 discloses a zoom lens for a so-called mirrorless camera. In the zoom lens of Patent Document 2, the fourth lens group moves on the optical axis at the time of focusing. However, the number of lenses constituting the fourth lens group is large, the drive mechanism of the focus lens group is large, and the size of the image pickup apparatus cannot be sufficiently reduced.

Japanese Unexamined Patent Publication No. 2008-003195 Japanese Unexamined Patent Publication No. 2016-109719

In the above-mentioned conventional technique, a compact zoom lens having good optical performance and an imaging device including the zoom lens have not been realized. In particular, the drive mechanism of the focus lens group is large, and the demand for miniaturization has not been sufficiently realized.

The present invention has been made in view of the above-mentioned problems of a conventional zoom lens and an image pickup apparatus provided with the same, and the main object thereof is a compact zoom lens having good optical performance and an image pickup provided with the same. To provide the equipment.

The zoom lens according to one aspect of the present invention is composed of a positive first lens group, a negative second lens group, and an overall positive Gr group in order from the object side.
The Gr group is composed of a Grf group, a negative Grm group, and a Grr group in order from the object side.
At the time of scaling, the distance between the first lens group and the second lens group and the distance between the second lens group and the Gr group change.
At least one of the scaling time and the focusing time, the distance between the Grf group and the Grm group and the distance between the Grm group and the Grr group change.
The Grf group has a Grf convex lens arranged on the most object side of the Grf group, and at least one Grf concave lens.
It is a zoom lens that satisfies the following conditional expression.
1.60 <ndGrfp <2.50 ・ ・ ・ ・ ・ ・ (1)
1.82 <ndGrfn <2.50 ・ ・ ・ ・ ・ ・ (2)
42 <vdGrmn <100 ・ ・ ・ ・ ・ ・ (3)
here,
ndGrfp: Refractive index of the Grf convex lens on the d line
ndGrfn: Refractive index of the Grf concave lens on the d line
vdGrmn: The minimum Abbe number in the d-line of the concave lens included in the Grm group.

In the present specification, the distance between the Grf group and the Grm group indicates the distance between the most image side surface of the Grf group and the most object side surface of the Grm group. The distance between the Grm group and the Grr group indicates the distance between the most image side surface of the Grm group and the most object side surface of the Grr group.

The image pickup device according to one aspect of the present invention includes the above-mentioned zoom lens and an image pickup element provided on the image side of the zoom lens that converts an optical image formed by the zoom lens into an electrical signal. It is characterized by that.

According to the present invention as described above, it is possible to provide a compact zoom lens having good optical performance and an imaging device including the same.

It is sectional drawing which shows the lens structure of the zoom lens of the numerical example 1 of this invention. It is a spherical aberration diagram, astigmatism diagram, and distortion diagram at infinity focusing at the wide-angle end of the zoom lens of the numerical embodiment 1 of the present invention. Numerical values of the present invention are a spherical aberration diagram, an astigmatism diagram, and a distortion aberration diagram at infinity focusing at an intermediate focal length of the zoom lens of the first embodiment. It is a spherical aberration diagram, astigmatism diagram, and distortion diagram at infinity focusing at the telephoto end of the zoom lens of the numerical embodiment 1 of the present invention. It is sectional drawing which shows the lens structure of the zoom lens of the numerical example 2 of this invention. It is a spherical aberration diagram, astigmatism diagram, and distortion diagram at infinity focusing at the wide-angle end of the zoom lens of the numerical embodiment 2 of the present invention. It is a spherical aberration diagram, astigmatism diagram, and distortion diagram at infinity focusing at the intermediate focal length of the zoom lens of the numerical embodiment 2 of the present invention. It is a spherical aberration diagram, astigmatism diagram, and distortion diagram at infinity focusing at the telephoto end of the zoom lens of the numerical embodiment 2 of the present invention. It is sectional drawing which shows the lens structure of the zoom lens of the numerical example 3 of this invention. It is a spherical aberration diagram, astigmatism diagram, and distortion diagram at the time of infinity focusing at the wide-angle end of the zoom lens of the numerical embodiment 3 of the present invention. It is a spherical aberration diagram, astigmatism diagram, and distortion diagram at infinity focusing at the intermediate focal length of the zoom lens of the numerical embodiment 3 of the present invention. It is a spherical aberration diagram, astigmatism diagram, and distortion diagram at infinity focusing at the telephoto end of the zoom lens of Numerical Example 3 of the present invention. It is sectional drawing which shows the lens structure of the zoom lens of the numerical example 4 of this invention. It is a spherical aberration diagram, astigmatism diagram, and distortion diagram at infinity focusing at the wide-angle end of the zoom lens of the numerical embodiment 4 of the present invention. Numerical values of the present invention are a spherical aberration diagram, an astigmatism diagram, and a distortion aberration diagram at infinity focusing at an intermediate focal length of the zoom lens of Example 4. It is a spherical aberration diagram, astigmatism diagram, and distortion diagram at infinity focusing at the telephoto end of the zoom lens of the numerical embodiment 4 of the present invention. It is sectional drawing which shows the lens structure of the zoom lens of the numerical example 5 of this invention. It is a spherical aberration diagram, astigmatism diagram, and distortion diagram at infinity focusing at the wide-angle end of the zoom lens of the numerical embodiment 5 of the present invention. Numerical values of the present invention are a spherical aberration diagram, an astigmatism diagram, and a distortion aberration diagram at infinity focusing at an intermediate focal length of the zoom lens of Example 5. It is a spherical aberration diagram, astigmatism diagram, and distortion diagram at infinity focusing at the telephoto end of the zoom lens of Numerical Example 5 of the present invention. It is sectional drawing which shows the lens structure of the zoom lens of the numerical example 6 of this invention. It is a spherical aberration diagram, astigmatism diagram, and distortion diagram at infinity focusing at the wide-angle end of the zoom lens of the numerical embodiment 6 of the present invention. It is a spherical aberration diagram, astigmatism diagram, and distortion diagram at infinity focusing at the intermediate focal length of the zoom lens of the numerical embodiment 6 of the present invention. It is a spherical aberration diagram, astigmatism diagram, and distortion diagram at infinity focusing at the telephoto end of the zoom lens of the numerical embodiment 6 of the present invention. It is a block diagram of the image pickup apparatus of the Example of this invention.

Hereinafter, embodiments of the zoom lens and the imaging device according to the present invention will be described.
(Zoom lens configuration)
The zoom lens according to the present invention includes a positive first lens group, a negative second lens group, and a positive Gr group as a whole. The Gr group is composed of a Grf group, a negative Grm group, and a Grr group in order from the object side. The magnification is changed by changing the distance between the first lens group and the second lens group and the distance between the second lens group and the Gr group. At least one of scaling and focusing is performed by changing the distance between the Grf group and the Grm group and the distance between the Grm group and the Grr group.

The first lens group is a lens group arranged closest to the object in the lens groups constituting the zoom lens. As long as the first lens group has a positive refractive power, the specific lens configuration is not particularly limited. For example, the first lens group preferably has at least one concave lens in order to satisfactorily correct aberrations and obtain a high-performance zoom lens. Further, it is more preferable to have a concave lens on the most object side.

The distance between the first lens group and the second lens group changes when the magnification is changed. More preferably, when the magnification is changed from the wide-angle end to the telephoto end, the first lens group moves to the object side, so that the total length of the zoom lens at the wide-angle end can be reduced.

The second lens group is arranged on the image side of the first lens group, and the distance between the second lens group and the adjacent lens group changes at the time of magnification change. As long as the second lens group has a negative refractive power, the specific lens configuration is not particularly limited. For example, it is preferable that the second lens group has at least one convex lens in order to satisfactorily correct aberrations and obtain a high-performance zoom lens.

The Gr group is a general term for lenses that include at least one lens group whose distance from adjacent lens groups changes at the time of magnification change and are arranged on the image side of the second lens group in the zoom lens. The Gr group may include two or more lens groups that perform magnification by changing the interval at the time of magnification change, and has a positive refractive power as a whole, and the Grf group, Grm group, which will be described below, As long as it is composed of Grr groups, the specific lens configuration and the number of lens groups included are not particularly limited.

The Gr group is composed of a Grf group, a negative Grm group, and a Grr group. The distance between the Grf group and the Grm group and the distance between the Grm group and the Grr group vary in either scaling or focusing, or both. The Grf group refers to all the lenses arranged on the object side of the Gr group from the distance on the object side of the Grm group that changes at least one of the scaling or focusing of the negative Grm group, and the Grr group refers to the Gr. In a group, it refers to all lenses arranged on the image side of the image side spacing of the Grm group that change in at least one of the scaling or focusing of the negative Grm group. The Grf group and the Grr group may include two or more lens groups that perform magnification by changing the interval at the time of magnification change, and the specific lens configuration and the number of included groups are particularly limited. is not it.

It is preferable that the Grf group has a Grf convex lens arranged on the most object side of the Grf group and at least one Grf concave lens.
By arranging the Grf convex lens on the most object side of the Grf group, the diameter of the lens on the image side can be reduced, which is effective in reducing the size of the zoom lens.
Further, arranging the Grf concave lens in the Grf group is effective in correcting spherical aberration, coma, and curvature of field, and makes it possible to obtain good optical performance over the entire zoom range.

The zoom lens according to the embodiment of the present invention preferably satisfies the following conditional expression.
(Conditional expression (1))
1.60 <ndGrfp <2.50 ・ ・ ・ ・ ・ ・ (1)
here,
ndGrfp: Refractive index of the Grf convex lens on the d line

The conditional expression (1) defines the refractive index of the Grf convex lens of the zoom lens on the d line. The miniaturization of the zoom lens can be achieved by satisfying the range specified by the conditional expression (1).
If the lower limit of the conditional expression (1) is exceeded, the refractive index of the Grf convex lens on the d line becomes smaller than the appropriate value, the required refractive power cannot be obtained, and it becomes difficult to reduce the diameter of the lens arranged on the image side. It is not desirable.
If the upper limit of the conditional expression (1) is exceeded, the performance deterioration due to surface habit and eccentricity becomes large, and it is difficult to secure good optical performance over the entire zoom range due to the influence of manufacturing error, which is not desirable.

In order to obtain the above effect, the lower limit of the conditional expression (1) is preferably 1.70, more preferably 1.80, and even more preferably 1.85. The upper limit is preferably 2.10, more preferably 2.00, and even more preferably 1.94.

The zoom lens according to the embodiment of the present invention preferably satisfies the following conditional expression.
(Conditional expression (2))
1.82 <ndGrfn <2.50 ・ ・ ・ ・ ・ ・ (2)
here,
ndGrfn: Refractive index of the Grf concave lens on the d line

The conditional expression (2) defines the refractive index of the Grf concave lens included in the Grf group on the d-line. By satisfying the range specified by the conditional expression (2), it is effective in correcting spherical aberration, coma, and curvature of field generated by a positive refractive power, and good optical performance can be obtained in the entire zoom range. ..
When the lower limit of the conditional expression (2) is exceeded, the refractive index of the Grf concave lens on the d line becomes smaller than the appropriate value, and the correction is insufficient for spherical aberration, coma aberration, and curvature of field generated by the positive refractive power component. .. As a result, aberration correction becomes difficult in the entire optical system, which is not desirable.
When the upper limit of the conditional equation (2) is exceeded, the refractive index of the Grf concave lens on the d-line becomes larger than the appropriate value, and spherical aberration, coma, and curvature of field generated by the positive refractive power component are overcorrected. .. As a result, aberration correction becomes difficult in the entire optical system, which is not desirable.

In order to obtain the above effect, the lower limit of the conditional expression (2) is preferably 1.85, more preferably 1.90. The upper limit is preferably 2.10, more preferably 2.00, and even more preferably 1.94.

The zoom lens according to the embodiment of the present invention preferably satisfies the following conditional expression.
(Conditional expression (3))
42 <vdGrmn <100 ・ ・ ・ ・ ・ ・ (3)
here,
vdGrmn: The minimum Abbe number in the d-line of the concave lens included in the Grm group.

The conditional expression (3) defines the concave lens of the Grm group having the smallest Abbe number on the d line. By satisfying the range specified by the conditional expression (3), fluctuations in axial chromatic aberration that occur during magnification change or focusing can be suppressed, and good optical performance can be obtained over the entire zoom range.
When the lower limit of the conditional expression (3) is exceeded, the minimum Abbe number of the concave lens included in the Grm group on the d line becomes smaller than the appropriate value, and the glass becomes highly dispersed compared to the appropriate concave lens included in the Grm group. , The under-axis chromatic aberration generated by the positive refractive power in the zoom lens is overcorrected. As a result, aberration correction becomes difficult in the entire optical system, which is not desirable.

When the upper limit of the conditional expression (3) is exceeded, the minimum Abbe number in the d-line of the concave lens included in the Grm group becomes larger than the appropriate value, and the glass has a lower dispersion than the appropriate concave lens included in the Grm group. , The under-axis chromatic aberration generated by the positive refractive power component in the zoom lens is insufficiently corrected. As a result, aberration correction becomes difficult in the entire optical system, which is not desirable.

In order to obtain the above effect, in the conditional expression (3), the upper limit value is preferably 80.0, more preferably 70.0, and even more preferably 60.0.

The zoom lens according to the embodiment of the present invention preferably satisfies the following conditional expression.
(Conditional expression (4))
10.0 <vdGrfp <35.0 ・ ・ ・ ・ ・ (4)
here
vdGrfp: Abbe number on the d-line of the Grf convex lens

The conditional expression (4) defines the Abbe number on the d-line of the Grf convex lens. By satisfying the range specified by the conditional expression (4), the over-axis chromatic aberration generated by the negative refractive power component at the telephoto end can be under-corrected, the secondary spectrum is minimized, and the entire zoom range is reached. Good chromatic aberration performance can be obtained.
When the lower limit of the conditional expression (4) is exceeded, the Abbe number in the d line of the Grf convex lens becomes smaller than the appropriate value, and the glass becomes highly dispersed compared to the glass properly selected as the Grf convex lens, and the negative in the zoom lens. It is an overcorrection for the over-axis chromatic aberration generated by the refractive power component of. As a result, aberration correction becomes difficult in the entire optical system, which is not desirable.
When the upper limit of the conditional expression (4) is exceeded, the Abbe number in the d line of the Grf convex lens becomes larger than the appropriate value, and the glass becomes a glass having a lower dispersion than the glass properly selected as the Grf convex lens, and the negative in the zoom lens. The correction is insufficient for the over-axis chromatic aberration generated by the refractive power component of. As a result, aberration correction becomes difficult in the entire optical system, which is not desirable.

In order to obtain the above effect, the lower limit of the conditional expression (4) is preferably 15.0, more preferably 17.5. The upper limit is preferably 33.0, more preferably 30.0, and even more preferably 25.0.

The zoom lens according to the embodiment of the present invention preferably satisfies the following conditional expression.
(Conditional expression (5))
10.0 <vdGrfn <40.0 ・ ・ ・ ・ ・ (5)
here
vdGrfn: Abbe number on the d-line of the Grf concave lens

The conditional expression (5) defines the Abbe number on the d-line of the Grf concave lens. By satisfying the range specified by the conditional expression (5), the under-axis chromatic aberration generated by the positive refractive power component at the telephoto end can be overcorrected, the secondary spectrum is minimized, and the entire zoom range is reached. Good chromatic aberration performance can be obtained.
When the lower limit of the conditional expression (5) is exceeded, the Abbe number on the d-line of the Grf concave lens becomes smaller than the appropriate value, and the glass becomes highly dispersed compared to the glass properly selected as the Grf concave lens, and the positive in the zoom lens. It is an overcorrection for the under-axis chromatic aberration generated by the refractive power component of. As a result, aberration correction becomes difficult in the entire optical system, which is not desirable.

When the upper limit of the conditional expression (5) is exceeded, the Abbe number in the d line of the Grf concave lens becomes larger than the appropriate value, and the glass becomes a glass having a lower dispersion than the glass properly selected as the Grf concave lens, and the positive in the zoom lens. The correction is insufficient for the under-axis chromatic aberration generated by the refractive power component of. As a result, aberration correction becomes difficult in the entire optical system, which is not desirable.

In order to obtain the above effect, the lower limit of the conditional expression (5) is preferably 15.0, more preferably 17.5. The upper limit is preferably 35.0, more preferably 32.0, and even more preferably 25.0.

In the zoom lens according to the embodiment of the present invention, it is preferable that the Grm group is a focusing lens group.

By using the Grm group as the focusing lens group, the drive mechanism can be downsized as compared with the case where the first lens group or the second lens group is used as the focusing lens group. Further, by satisfying the conditional expression (1), the conditional expression (2), and the conditional expression (3), it is possible to suppress the aberration fluctuation when focusing on the object at a finite distance, so that the optical performance is good. Can be obtained.

The zoom lens according to the embodiment of the present invention preferably satisfies the following conditional expression.
(Conditional expression (6))
-5 <fGrm / fw <-0.1 ・ ・ ・ ・ ・ (6)
here
fGrm: Focal length of the Grm group
fw: Focal length at the wide-angle end of the zoom lens

The conditional expression (6) defines the ratio of the focal length of the Grm group to the focal length at the wide-angle end of the zoom lens. By satisfying the range defined by the conditional expression (6), spherical aberration and coma aberration generated in the Grm group can be suppressed to an appropriate amount. Further, when trying to obtain a predetermined zoom magnification, the amount of movement of the Grm group can be set to an appropriate amount, and the zoom lens as a whole can be miniaturized.

When the lower limit of the conditional expression (6) is exceeded, the focal length of the Grm group becomes longer than the appropriate value, that is, the refractive power of the Grm group becomes weaker than the appropriate value, and a predetermined zoom magnification is obtained. The amount of movement of the Grm group is larger than the appropriate amount, and the zoom lens becomes large, which is not preferable.
When the upper limit of the conditional expression (6) is exceeded, the focal length of the Grm group becomes shorter than the appropriate value, that is, the refractive power of the Grm group becomes stronger than the appropriate value, and spherical aberration and coma aberration generated in the Grm group occur. Is larger than the appropriate amount, and it becomes difficult to correct the aberration in the entire zoom lens, which is not preferable.

In order to obtain the above effect, the lower limit of the conditional expression (6) is preferably -4.0, more preferably -3.0. The upper limit is preferably -0.5, more preferably -0.6, and even more preferably -0.7.

The zoom lens according to the embodiment of the present invention preferably has an aperture diaphragm and satisfies the following conditional expression.
(Conditional expression (7))
0.01 <Tsfw / fw <5.0 ・ ・ ・ ・ ・ (7)
here
Tsfw: Distance between the aperture stop and the Grm group at the wide-angle end of the zoom lens.
fw: Focal length at the wide-angle end of the zoom lens

Conditional expression (7) defines the ratio of the distance between the aperture diaphragm and the Grm group at the wide-angle end of the zoom lens and the focal length of the zoom lens at the wide-angle end. By satisfying the range specified by the conditional expression (7), the height of the main ray of the off-axis ray passing through the Grm group can be lowered, and the diameter of the Grm group is reduced and when zooming or focusing. It is possible to suppress the fluctuation of the curvature of field that occurs.
If the lower limit of the conditional expression (7) is exceeded, the distance between the aperture diaphragm and the Grm group at the wide-angle end becomes smaller than the appropriate value, and it becomes difficult to arrange the lens holding parts and the like, which is not preferable.
When the upper limit of the conditional expression (7) is exceeded, the distance between the aperture diaphragm at the wide-angle end and the Grm group becomes larger than the appropriate value, the height of the main ray passing through the Grm group becomes higher, and the diameter of the Grm group increases. It is not preferable because the curvature of field generated during enlargement and zooming or focusing becomes large, and it becomes difficult to reduce the size of the zoom lens and correct aberrations in the entire optical system.

In order to obtain the above effect, the lower limit of the conditional expression (7) is preferably 0.1, more preferably 0.2, and even more preferably 0.5. The upper limit is preferably 3.0, more preferably 2.5, and even more preferably 2.0.

The zoom lens according to the embodiment of the present invention preferably has at least two Grf concave lenses.

With this configuration, it is effective in correcting spherical aberration, coma aberration, curvature of field, etc. generated by a positive refractive power component, and good optical performance can be obtained in the entire zoom range.

In the zoom lens according to the embodiment of the present invention, it is preferable that the Grf concave lens has a concave surface on the image side.

With this configuration, curvature of field can be overcorrected, and aberration correction can be performed satisfactorily in the entire optical system. In order to obtain the above effect, it is more preferable that at least two Grf concave lenses have a concave surface on the image side.

In the zoom lens according to the embodiment of the present invention, it is preferable that the Grf concave lens forms a junction lens.

In this configuration, spherical aberration and curvature of field can be satisfactorily corrected by the action of the joint surface of the Grf concave lens. Further, as compared with the case where the Grf concave lens is composed of a single lens, it is possible to suppress the occurrence of axial coma aberration due to eccentricity during assembly.

In the zoom lens according to the embodiment of the present invention, it is preferable that the Grm group is composed of a single lens.

With this configuration, the weight of the Grm group can be reduced, the variable magnification drive mechanism can be easily simplified, and the zoom lens can be miniaturized.

Here, the single lens refers to one lens (optical element) having one optical surface on the object side and one on the image side, and various coatings such as an antireflection film and a protective film are applied to the optical surface. Those that have been damaged are also included in the single lens. The shape of the optical surface of the single lens is not particularly limited, and may be spherical or aspherical. One side thereof may be flat. The method for manufacturing the single lens is not particularly limited, and includes various lenses manufactured by polishing, molding, injection molding, or the like. On the other hand, a single lens means that it is composed of one lens, and is a bonded lens in which a plurality of lenses such as a positive lens and a negative lens are adhered or adhered to each other on the optical surface without interposing an air layer. Is excluded, and further, the one in which an air layer is interposed between the optical surfaces of a plurality of lenses is also excluded.

The zoom lens according to the embodiment of the present invention preferably has a vibration-proof lens system in which the Gr group moves in a direction perpendicular to the optical axis to change the imaging position.

Since the Gr group has an anti-vibration lens system that moves in a direction perpendicular to the optical axis to change the imaging position, the anti-vibration lens system is arranged in the first lens group and the second lens group. Compared to the case, the camera shake of the photographer can be satisfactorily corrected without increasing the size of the drive mechanism.

In order to obtain the above effect, the anti-vibration lens system is preferably arranged in the Grf group.

In the zoom lens according to the embodiment of the present invention, it is preferable that the anti-vibration lens system has a lens having an aspherical surface on at least one surface.

When the anti-vibration lens system has a lens having an aspherical surface on at least one surface, it is possible to suppress the occurrence of axial coma aberration and curvature of field during camera shake correction, and to obtain good optical performance.

The zoom lens according to the embodiment of the present invention preferably satisfies the following conditional expression.
-10 <(1-βvc) × βvcr <-0.10 ・ ・ ・ (8)
Here, βvc: lateral magnification of the anti-vibration lens system at the telephoto end βvcr: composite lateral magnification of all lenses arranged on the image side of the anti-vibration lens system at the telephoto end.

The conditional expression (8) is an expression that defines the ratio of the vertical movement amount of the anti-vibration lens system to the image point movement amount on the image plane, that is, the camera shake correction coefficient. By satisfying the range specified by the conditional expression (8), the camera shake correction coefficient can be set to an appropriate range, the occurrence of axial coma aberration and curvature of field during camera shake correction can be suppressed, and camera shake correction can be performed. It is possible to realize a large-diameter lens having excellent optical performance even at times.
When the lower limit of the conditional expression (8) is exceeded, the camera shake correction coefficient becomes larger than the appropriate value. As a result, it is necessary to make the combined refractive power of all the lenses arranged on the image side of the anti-vibration lens system and the anti-vibration lens system stronger than the appropriate values, but the axial coma aberration and the image at the time of camera shake correction This is not preferable because the amount of curvature of field increases.
When the upper limit of the conditional expression (8) is exceeded, the camera shake correction coefficient becomes smaller than the appropriate value, the vertical movement amount of the anti-vibration lens system during camera shake correction becomes larger than the appropriate value, and the drive mechanism becomes large. This is not preferable because it leads to an increase in the size of the zoom lens.

In order to obtain the above effect, the lower limit of the conditional expression (8) is preferably -5.0, more preferably -4.0. The upper limit is preferably -0.55, more preferably -1.0.

In the zoom lens according to the embodiment of the present invention, it is preferable that the anti-vibration lens system is a single lens.

With this configuration, the weight of the anti-vibration lens system can be reduced, the drive mechanism of the anti-vibration lens system can be easily simplified, and the zoom lens can be miniaturized.

The image pickup device according to an embodiment of the present invention includes the above-mentioned zoom lens and an image pickup element provided on the image side of the zoom lens and converting an optical image formed by the zoom lens into an electrical signal. It is preferable that the image sensor is a lens. Here, the image sensor and the like are not particularly limited, and a solid-state image sensor such as a CCD sensor or a CMOS sensor can also be used. That is, the image pickup device according to the present invention is preferably an image pickup device using these solid-state image pickup elements such as a digital camera and a video camera. Further, the image pickup device may be a lens-fixed image pickup device in which the lens is fixed to a housing, or may be an interchangeable lens type image pickup device such as a single-lens reflex camera or a mirrorless single-lens camera. Of course.

<Example>
Next, numerical examples of the present invention will be described with reference to numerical tables and figures. However, the present invention is not limited to the following numerical examples.
The zoom lens of each numerical example listed below is a photographing zoom lens preferably used for an imaging device (optical device) such as a digital camera, a video camera, and a silver salt film camera.

In common with respect to each numerical embodiment, in the lens cross-sectional view (FIG. 1, FIG. 5, FIG. 9, FIG. 13, FIG. 17, FIG. 21), the left side is the object side and the right side is the image side when facing the drawing. is there. The arrow at the bottom of the lens cross section represents the locus of movement of each lens group with variable magnification from the wide-angle end (W) to the telephoto end (T) from top to bottom.

(Numerical Example 1)
FIG. 1 is a cross-sectional view of a lens showing the configuration of the numerical embodiment 1. The zoom lens is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a Gr group Gr having a positive refractive power in order from the object side. The Gr lens group Gr is a Grf group having a positive refractive power, that is, a third lens group G3, a Grm group having a negative refractive power, that is, a fourth lens group G4, and a Grr group having a positive refractive power, that is, a fifth lens group G5. Consists of.

When scaling from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, and the second lens group G2 moves to the image side so as to draw a convex locus on the image side, and then moves to the object side. Moving. The third lens group G3 moves to the object side, the fourth lens group G4 moves to the object side, and the fifth lens group G5 is fixed on the optical axis.
Focusing is performed by moving the fourth lens group G4 along the optical axis.
The Gvc concave lens Gvc in the third lens group G3 is moved in the direction perpendicular to the optical axis to correct camera shake during shooting.
In FIG. 1, "S" is an aperture diaphragm, and "I" shown on the image side of the zoom lens is an image plane. A light receiving surface of a solid-state image sensor such as a CCD sensor or a CMOS sensor, a film surface of a silver halide film, or the like is arranged on the image surface. The same applies to the following examples.

Numerical values In Table 1 showing the lens data of Example 1, the surface number No. Is the order of the lens surfaces counted from the object side, R is the radius of curvature of the lens surface, D is the distance on the optical axis of the lens surface, Nd is the refractive index with respect to the d line (wavelength λ = 587.6 nm), and ABV is the d line. The Abbe numbers for (wavelength λ = 587.6 nm) are shown respectively. Further, the aperture diaphragm S is indicated by adding STOP to the surface number. Further, when the lens surface is aspherical, the surface number is indicated by ASPH, and the column of radius of curvature R indicates the paraxial radius of curvature.
Table 2 shows the F-number, half angle of view, and the distance between the movable lens group and the adjacent lens group on the image side at each focal length of the zoom lens.
Table 3 shows the aspherical coefficient and the conical constant when the shape of the aspherical surface is expressed by the following equation. The aspherical surface shall be defined by the following equation.
z = ch ² / [1 + {1- (1 + k) c ² h ² } 1/2] + A ₄ h ⁴ + A ₆ h ⁶ + A ₈ h ⁸ + A ₁₀ h ¹⁰ + A ₁₂ h ¹²
(However, c is the curvature (1 / r), h is the height from the optical axis, k is the conical coefficient, and A ₄ , A ₆ , A ₈ , A ₁₀ , and A ₁ are the aspherical coefficients of each order.)
Since these are the same in Tables 3 to 19 relating to Numerical Examples 2 to 6, the description thereof will be omitted below.

2 to 4 show a longitudinal aberration diagram of the zoom lens when it is in focus at infinity. Each longitudinal aberration diagram shows spherical aberration, astigmatism, and distortion in order from the left.
In the figure showing spherical aberration, the solid line represents the d line (587.6 nm). In the figure showing astigmatism, the solid line represents the sagittal direction of the d line, and the broken line represents the meridional direction of the d line.
The order in which these aberrations are displayed, the arrangement, and the solid lines, wavy lines, and the like in each figure are shown in Examples 2 to 6, FIGS. 6 to 8, 10 to 12, 14 to 16, and so on. Since the same applies to FIGS. 18 to 20 and 22 to 24, the description thereof will be omitted below.

[Table 1]
No. RD Nd ABV
1 2000.000 1.200 1.92286 20.88
2 251.498 4.474 1.77250 49.62
3-334.651 0.200
4 41.925 5.956 1.59319 67.90
5 75.902 D (5)
6ASPH 84.620 0.200 1.51460 49.96
7 50.864 1.000 1.87070 40.73
8 14.151 8.695
9 -26.471 0.800 1.61997 63.88
10 20.069 6.749 1.85026 32.35
11 -33.310 0.953
12 -23.718 1.866 1.90366 31.31
13 -46.358 D (13)
14 33.006 3.063 1.80518 25.46
15 -368.354 1.471
16STOP 0.000 1.000
17 616.656 6.909 1.55032 75.50
18 -25.902 0.800 1.92119 23.96
19 151.063 1.000
20 21.429 0.800 2.00100 29.13
21 15.058 7.670 1.59319 67.90
22 -37.466 1.000
23ASPH -61.153 1.000 1.69350 53.20
24ASPH 34.627 0.800
25ASPH 20.773 4.788 1.77377 47.17
26ASPH -84.058 D (26)
27 -197.049 1.000 1.62299 58.12
28 19.516 0.150 1.51460 49.96
29ASPH 19.516 D (29)
30 53.015 6.000 1.77250 49.62
31 -115.535 18.080
32 inf. 2.500 1.51680 64.20
33 inf. 1.000

[Table 2]
F 16.477 29.656 53.349
Fno 2.903 2.904 2.902
W 42.054 25.047 14.489
D (5) 1.000 18.718 35.468
D (13) 24.375 7.962 1.000
D (26) 1.098 4.854 5.544
D (29) 6.405 7.808 21.553

[Table 3]
No. K A4 A6 A8 A10 A12
6 0.00 1.78265E-05 -3.80659E-08 2.10074E-10 -8.52242E-13 1.58686E-15
23 0.00 -2.36708E-06 -2.68549E-07 2.80258E-09 5.81858E-12 -1.25057E-13
24 0.00 -1.39621E-05 1.45229E-08 -7.53754E-09 1.52158E-10 -8.35097E-13
25 0.00 -1.64474E-05 5.20674E-07 -6.41791E-09 8.49591E-11 -1.75638E-13
26 0.00 3.26460E-05 4.13941E-07 1.91471E-09 -4.60396E-11 6.77568E-13
29 0.00 4.13276E-06 -3.80651E-07 6.12980E-09 -6.18723E-11 2.69244E-13

Numerical value The focal length of the first lens group G1 of Example 1 is 111.357, the focal length of the second lens group G2 is -19.444, the focal length of the third lens group G3 is 23.316, and the focal length of the fourth lens group G4 is -28.434. , The focal length of the fifth lens group G5 is 47.783.

(Numerical Example 2)
FIG. 5 is a cross-sectional view of a lens showing the configuration of the zoom lens of the numerical embodiment 2 according to the present invention. Numerical value The zoom lens of Example 2 is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a Gr group Gr having a positive refractive power in order from the object side. The lens. The Gr group Gr is a Grf group Grf having a positive refractive power, that is, a third lens group G3, a Grm group Grm having a negative refractive power, that is, a fourth lens group G4, and a Grr group Grr having a positive refractive power, that is, a fifth lens group. It is composed of G5.

When scaling from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, and the second lens group G2 moves to the image side so as to draw a convex locus on the image side, and then moves to the object side. Moving. The third lens group G3 moves to the object side, the fourth lens group G4 moves to the object side, and the fifth lens group G5 is fixed on the optical axis.
Focusing is performed by moving the fourth lens group G4 along the optical axis.
The Grf concave lens Gvc in the third lens group G3 is moved in the direction perpendicular to the optical axis to satisfactorily correct camera shake during shooting.

Numerical value The lens data and the like of Example 2 are as follows.
[Table 4]
No. RD Nd ABV
1 688.383 1.200 1.92286 20.88
2 164.125 3.817 1.75500 52.34
3 1017.671 0.200
4 56.238 6.772 1.75500 52.34
5 186.744 D (5)
6ASPH 83.374 0.200 1.51460 49.96
7 51.042 1.000 1.87070 40.73
8 15.031 9.752
9 -29.021 0.800 1.61997 63.88
10 21.625 6.654 1.85026 32.35
11 -31.540 0.676
12 -25.319 1.000 1.80000 29.84
13 -63.814 D (13)
14 27.791 2.786 1.92286 20.88
15 189.515 1.816
16STOP 0.000 1.000
17 61.474 2.751 1.59319 67.90
18 -44.949 0.800 1.96300 24.11
19 28.024 0.200
20 17.999 0.800 2.00100 29.13
21 12.925 6.025 1.59319 67.90
22 -42.097 1.025
23ASPH -44.824 1.000 1.69350 53.20
24ASPH 36.345 0.808
25ASPH 22.574 6.088 1.77250 49.50
26ASPH -48.210 D (26)
27 -120.204 1.000 1.59349 67.00
28 25.406 0.150 1.51460 49.96
29ASPH 25.406 D (29)
30 69.162 6.500 1.61997 63.88
31 -113.620 29.120
32 inf. 2.500 1.51680 64.20
33 inf. 1.000

[Table 5]
F 24.714 40.968 67.899
Fno 4.100 4.100 4.100
W 42.458 27.220 17.161
D (5) 1.000 15.139 30.522
D (13) 20.628 7.362 1.000
D (26) 1.010 4.761 5.697
D (29) 8.241 11.662 26.544

[Table 6]
No. K A4 A6 A8 A10 A12
6 0.00 1.29752E-05 -3.14572E-08 1.62959E-10 -5.19631E-13 7.57582E-16
23 0.00 2.86692E-06 -2.30537E-07 3.22374E-09 -7.11810E-12 -6.17076E-14
24 0.00 -1.52890E-05 6.83680E-08 -4.22634E-09 8.33663E-11 -4.83401E-13
25 0.00 -1.93044E-05 4.39178E-07 -4.47022E-09 5.78013E-11 -1.72393E-13
26 0.00 3.16204E-05 2.34438E-07 2.44475E-09 -2.93199E-11 3.42601E-13
29 0.00 2.77133E-06 -1.26974E-07 1.12597E-09 -6.58648E-12 1.10279E-14

Numerical value The focal length of the first lens group G1 of Example 2 is 109.300, the focal length of the second lens group G2 is -21.888, the focal length of the third lens group G3 is 24.886, and the focal length of the fourth lens group G4 is -35.228. , The focal length of the fifth lens group G5 is 70.303.

(Numerical Example 3)
FIG. 9 is a cross-sectional view of a lens showing the configuration of the zoom lens of the numerical embodiment 3. Numerical value The zoom lens of Example 3 is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a Gr group Gr having a positive refractive power in order from the object side. The lens. The Gr group Gr is composed of a Grf group Grf having a positive refractive power, that is, a third lens group G3, a fourth lens group G4 having a negative refractive power, and a Grr group Grr having a positive refractive power, that is, a fifth lens group G5. Will be done.
When scaling from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, and the second lens group G2 moves to the image side so as to draw a convex locus on the image side, and then moves to the object side. Moving. Further, the third lens group G3 moves to the object side, the fourth lens group G4 moves to the object side, and the fifth lens group G5 moves to the object side.
Focusing is performed by moving the fourth lens group G4 along the optical axis.
The Gvc concave lens Gvc in the third lens group is moved about the optical axis in the direction perpendicular to the optical axis to correct camera shake during shooting.

Numerical value The lens data and the like of Example 3 are as follows.
[Table 7]
No. RD Nd ABV
1 182.146 1.200 1.92286 20.88
2 109.764 2.687 1.75500 52.34
3 168.071 0.200
4 76.975 5.053 1.75500 52.34
5 370.296 D (5)
6ASPH 82.805 0.200 1.51460 49.96
7 57.642 1.000 1.87070 40.73
8 16.704 10.803
9 -30.171 1.701 1.61997 63.88
10 24.307 6.761 1.85026 32.27
11 -42.477 1.809
12 -25.079 1.000 1.85478 24.80
13 -37.871 D (13)
14 24.331 3.420 1.85478 24.80
15 94.297 2.263
16STOP 0.000 1.002
17 56.891 2.971 1.59319 67.90
18 -68.385 0.800 1.95540 26.44
19 33.635 0.200
20 18.683 1.079 2.00100 29.13
21 11.766 6.488 1.59319 67.90
22 -46.883 1.000
23ASPH -50.612 1.000 1.77250 49.50
24ASPH 31.611 1.100
25ASPH 22.125 6.105 1.77250 49.50
26ASPH -69.424 0.382
27 -70.415 1.702 1.74077 27.76
28 -54.161 D (28)
29ASPH 132.494 0.800 1.59349 67.00
30ASPH 23.566 D (30)
31 44.723 2.124 1.66695 35.37
32 69.948 D (32)
33 inf. 2.500 1.51680 64.20
34 inf. 1.000

[Table 8]
F 24.725 40.963 67.911
Fno 4.100 4.100 4.100
W 42.496 27.174 17.167
D (5) 1.000 16.908 33.196
D (13) 24.936 9.908 1.000
D (28) 2.764 3.672 2.393
D (30) 14.606 13.698 14.976
D (32) 18.347 28.368 44.586

[Table 9]
No. K A4 A6 A8 A10 A12
6 0.00 9.98914E-06 -1.65026E-08 9.10887E-11 -2.78176E-13 3.99209E-16
23 0.00 -6.23788E-07 -2.62926E-07 6.37575E-09 -5.26054E-11 1.56101E-13
24 0.00 -1.19424E-05 -2.30539E-07 3.25711E-09 2.05167E-12 -1.31972E-13
25 0.00 -1.96508E-05 1.80923E-07 -2.43809E-09 3.96828E-11 -1.13302E-13
26 0.00 2.33283E-05 1.85050E-07 -1.03998E-09 6.70391E-12 1.06493E-13
29 0.00 -5.68298E-06 -3.67418E-08 3.42188E-10 1.19122E-11 -1.08488E-13
30 0.00 -6.63961E-06 -1.24517E-07 2.15708E-09 -7.18969E-12 -2.82251E-14

Numerical value The focal length of the first lens group G1 of Example 3 is 146.101, the focal length of the second lens group G2 is -25.334, the focal length of the third lens group G3 is 27.737, and the focal length of the fourth lens group G4 is -48.429. , The focal length of the fifth lens group G5 is 179.878.

(Numerical Example 4)
(Zoom lens configuration)
FIG. 13 is a cross-sectional view of a lens showing the configuration of the zoom lens of the numerical embodiment 4. Numerical value The zoom lens of Example 4 is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a Gr group Gr having a positive refractive power in order from the object side. The lens. The Gr group Gr is from the Grf group having a positive refractive power, that is, the third lens group G3, the Grm group having a negative refractive power, that is, the fourth lens group G4, and the Grr group having a positive refractive power, that is, the fifth lens group G5. It is composed.
When scaling from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, and the second lens group G2 moves to the image side so as to draw a convex locus on the image side, and then moves to the object side. Moving. The third lens group G3 moves to the object side, the fourth lens group G4 moves to the object side, and the fifth lens group G5 is fixed on the optical axis.
Focusing is performed by moving the fourth lens group G4 along the optical axis.
The Gvc concave lens Gvc in the third lens group G3 is moved in the direction perpendicular to the optical axis to correct camera shake during shooting.

Numerical value The lens data and the like of Example 4 are as follows.
[Table 10]
No. RD Nd ABV
1 996.724 1.200 1.92286 20.88
2 203.034 4.724 1.77250 49.62
3 -416.040 0.200
4 49.543 6.521 1.61997 63.88
5 115.082 D (5)
6ASPH 155.318 0.200 1.51460 49.96
7 65.339 1.190 1.87070 40.73
8 15.890 9.678
9 -24.547 0.800 1.61997 63.88
10 24.248 6.563 1.85026 32.35
11 -31.607 1.099
12 -23.095 1.199 1.90366 31.34
13 -37.985 D (13)
14 28.698 2.785 1.92286 20.88
15 75.762 2.392
16STOP 0.000 1.690
17 29.254 3.969 1.59319 67.90
18 -68.399 0.800 1.96300 24.11
19 30.865 1.000
20 21.086 1.748 2.00100 29.13
21 13.365 6.843 1.59319 67.90
22 -57.527 1.000
23ASPH -62.180 1.000 1.69350 53.20
24ASPH 41.625 0.800
25ASPH 21.055 7.114 1.77377 47.17
26ASPH -72.558 D (26)
27 -135.045 1.000 1.59349 67.00
28 20.826 0.150 1.51460 49.96
29ASPH 20.826 D (29)
30 49.638 5.324 1.75500 52.34
31 -128.013 18.763
32 inf. 2.500 1.51680 64.20
33 inf. 1.000

[Table 11]
F 17.507 34.486 67.899
Fno 2.900 2.900 2.900
W 40.339 21.809 11.484
D (5) 1.000 20.389 40.352
D (13) 28.449 8.314 1.000
D (26) 1.369 5.838 5.451
D (29) 5.930 7.909 23.950

[Table 12]
No. K A4 A6 A8 A10 A12
6 0.00 1.54091E-05 -2.95342E-08 1.42901E-10 -5.18027E-13 9.09923E-16
23 0.00 -5.62744E-06 1.71245E-07 -7.89939E-09 1.11898E-10 -4.89966E-13
24 0.00 -1.59116E-05 4.43181E-07 -1.45801E-08 1.83238E-10 -7.72093E-13
25 0.00 -1.26537E-05 3.56484E-07 -3.60385E-09 3.97646E-11 -9.90564E-14
26 0.00 3.08427E-05 1.97745E-07 2.35779E-09 -2.95500E-11 2.82052E-13
29 0.00 9.23625E-07 -2.51901E-07 3.69382E-09 -3.41158E-11 1.36937E-13

Numerical value The focal length of the first lens group G1 of Example 4 is 105.576, the focal length of the second lens group G2 is -21.226, the focal length of the third lens group G3 is 25.471, and the focal length of the fourth lens group G4 is -30.311. , The focal length of the fifth lens group G5 is 47.994.

(Numerical Example 5)
FIG. 17 is a cross-sectional view of a lens showing the configuration of the zoom lens of the numerical embodiment 5. Numerical value The zoom lens of Example 5 is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a Gr group Gr having a positive refractive power in order from the object side. The lens. The Gr group includes a Grf group having a positive refractive power, that is, a third lens group G3 having a positive refractive power, a fourth lens group G4 having a positive refractive power, and a Grm group having a negative refractive power, that is, a fifth lens group. It is composed of G5, a Grr group having a positive refractive power, that is, a sixth lens group G6.
When scaling from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, and the second lens group G2 moves to the image side so as to draw a convex locus on the image side, and then moves to the object side. Moving. Further, the third lens group G3 moves to the object side, the fourth lens group G4 moves to the object side, the fifth lens group G5 moves to the object side, and the sixth lens group G6 moves to the object side.
Focusing is performed by moving the fifth lens group G5 along the optical axis.
The Gvc concave lens Gvc in the fourth lens group is moved in the direction perpendicular to the optical axis to correct camera shake during shooting.

Numerical value The lens data and the like of Example 5 are as follows.
[Table 13]
No. RD Nd ABV
1 82.044 1.200 1.92286 20.88
2 64.694 6.488 1.75500 52.34
3 387.277 D (3)
4ASPH 87.363 0.200 1.51460 49.96
5 56.476 1.000 1.87070 40.73
6 16.888 11.178
7 -30.598 1.904 1.61997 63.88
8 25.618 6.832 1.85026 32.27
9 -41.264 1.278
10 -25.947 1.000 1.85478 24.80
11 -41.195 D (11)
12 24.680 3.508 1.85478 24.80
13 116.941 2.737
14STOP 0.000 1.000
15 58.461 2.853 1.59319 67.90
16 -71.228 0.800 1.95816 26.30
17 30.485 0.200
18 17.962 0.800 2.00100 29.13
19 11.698 7.151 1.59319 67.90
20 -40.302 D (20)
21ASPH -46.170 1.000 1.77250 49.50
22ASPH 30.047 1.015
23ASPH 20.282 7.579 1.77250 49.50
24ASPH -68.827 D (24)
25ASPH 130.453 0.800 1.59349 67.00
26ASPH 23.296 D (26)
27 45.401 2.113 1.78795 24.53
28 71.269 D (28)
29 inf. 2.500 1.51680 64.20
30 inf. 1.000

[Table 14]
F 24.723 40.962 67.903
Fno 4.110 4.112 4.109
W 42.482 27.164 17.165
D (3) 1.000 16.692 33.898
D (11) 24.662 9.853 1.000
D (20) 0.568 0.819 1.000
D (24) 3.248 3.757 2.505
D (26) 14.047 13.702 15.799
D (28) 18.475 28.496 43.307

[Table 15]
No. K A4 A6 A8 A10 A12
4 0.00 9.34445E-06 -1.48253E-08 7.21196E-11 -2.04831E-13 2.80677E-16
21 0.00 5.96329E-07 -3.88332E-07 7.63596E-09 -5.63489E-11 1.56101E-13
22 0.00 -1.17460E-05 -3.87541E-07 5.12724E-09 -5.02839E-12 -1.37730E-13
23 0.00 -2.26569E-05 1.26991E-07 -1.54165E-09 3.35046E-11 -1.22928E-13
24 0.00 2.73118E-05 1.50401E-07 -2.11620E-10 1.51568E-12 1.07210E-13
25 0.00 -1.00968E-05 -6.52017E-09 7.57102E-10 2.83635E-12 -5.91493E-14
26 0.00 -1.35319E-05 -6.29236E-08 2.18641E-09 -1.38061E-11 1.13791E-14

Numerical value The focal length of the first lens group G1 of Example 5 is 147.089, the focal length of the second lens group G2 is -25.354, the focal length of the third lens group G3 is 29.303, and the focal length of the fourth lens group G4 is 106.916. The focal length of the fifth lens group G5 is -47.918, and the focal length of the sixth lens group G6 is 153.227.

(Numerical Example 6)
FIG. 21 is a cross-sectional view of a lens showing the configuration of the zoom lens of the numerical embodiment 6. Numerical values In the zoom lens of Example 6, in order from the object side, the first lens group G1 having a positive refractive power, the second lens group G2 having a negative refractive power, and the Gr group Gr having a positive refractive power, that is, the third It is composed of a lens group G3. The third lens group G3 is composed of a Grf group Grf, a Grm group Grm, and a positive meniscus lens Grr group Grr.
When scaling from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, and the second lens group G2 moves to the image side so as to draw a convex locus on the image side, and then moves to the object side. It moves, and Gr group Gr moves to the object side.
Focusing is performed by moving the Grm group Grm having a negative refractive power along the optical axis.
The Gvc concave lens Gvc in the Grf group Grf can be moved in the direction perpendicular to the optical axis to satisfactorily correct camera shake during shooting.

Numerical value The lens data and the like of Example 6 are as follows.
[Table 16]
No. RD Nd ABV
1 103.235 1.200 1.92286 20.88
2 76.710 6.556 1.75500 52.34
3 3002.806 D (3)
4ASPH 103.048 0.200 1.51460 49.96
5 64.366 1.408 1.87070 40.73
6 18.409 10.221
7 -29.200 1.014 1.61997 63.88
8 25.410 5.945 1.85026 32.27
9 -48.133 2.183
10 -22.633 1.000 1.85478 24.80
11 -30.852 D (11)
12 23.704 3.790 1.85478 24.80
13 95.620 2.903
14STOP 0.000 1.000
15 60.390 2.994 1.59319 67.90
16 -65.131 0.800 1.95104 25.84
17 33.219 0.200
18 17.897 0.800 2.00100 29.13
19 11.429 8.294 1.59319 67.90
20 -71.986 1.352
21ASPH -44.888 1.000 1.77250 49.50
22ASPH 35.316 1.047
23ASPH 22.008 6.342 1.77250 49.50
24ASPH -42.598 3.152
25ASPH 306.708 0.800 1.59349 67.00
26ASPH 26.242 13.910
27 48.153 4.302 1.92286 20.88
28 60.270 D (28)
29 inf. 2.500 1.51680 64.20
30 inf. 1.000

[Table 17]
F 27.799 43.457 67.905
Fno 4.100 4.100 4.100
W 39.167 25.803 17.162
D (3) 3.897 17.308 26.394
D (11) 21.230 9.864 1.000
D (28) 18.961 29.875 46.649

[Table 18]
No. K A4 A6 A8 A10 A12
4 0.00 6.85022E-06 -9.01762E-09 5.33929E-11 -1.67759E-13 3.03955E-16
21 0.00 6.82104E-06 -3.99441E-07 7.90040E-09 -4.26423E-11 1.72015E-14
22 0.00 3.16978E-06 -5.15549E-07 5.87720E-09 1.37952E-11 -3.10812E-13
23 0.00 -2.50998E-05 -2.86707E-08 -1.11929E-09 2.83851E-11 -8.15037E-14
24 0.00 1.61800E-05 7.59569E-08 -9.24577E-10 -1.82886E-12 1.16079E-13
25 0.00 3.97589E-06 7.16355E-08 -1.06256E-10 -4.38988E-12 4.00442E-14
26 0.00 3.84251E-06 4.53217E-08 6.78497E-10 -1.11994E-11 5.67154E-14

Numerical value The focal length of the first lens group G1 of Example 6 is 153.381, the focal length of the second lens group G2 is -25.072, and the focal length of the third lens group G3 is 27.957.

(Imaging device)
In an embodiment of the photographing apparatus 100, as shown in FIG. 25, the photographing lens 110 is supported by a lens barrel 106 mounted on the photographing apparatus housing 102 by a lens mount 104. The subject image is formed on the imaging surface I via the photographing lens 110 and the cover glass C, and the subject image is displayed on the display 112.

(Numerical value related to conditional expression)
The values of the conditional expressions according to each numerical example are as follows.
[Table 19]
Example 1 Example 2 Example 3 Example 4 Example 5 Example 5 Example 6
(1) ndpH 1.80518 1.92286 1.92286 1.92286 1.85500 1.85500
(2) ndnH 2.00100 2.00100 2.00100 2.00100 2.00100 2.00100
(3) vdGrmn 58.12 67.00 67.00 67.00 67.00 67.00
(4) vdGrfp 25.45 20.88 20.88 20.88 26.29 26.29
(5) vdGrfn 29.13 29.13 29.13 29.13 29.13 29.13
(6) fGrm / fw -1.726 -1.425 -1.959 -1.731 -1.938 -1.741
(7) Tsfw / fw 1.630 0.870 1.076 1.561 0.541 0.971
(8) (1-βvc) × βvcr -1.532 -2.170 -2.750 -1.417 -2.883 -2.802

G1 1st lens group G2 2nd lens group G3 3rd lens group G4 4th lens group G5 5th lens group G6 6th lens group 100 Imaging device 102 Imaging device housing 104 Lens mount 106 Lens lens barrel 110 Imaging lens

Claims (15)

From the object side, it consists of a positive first lens group, a negative second lens group, and a positive Gr group as a whole.
The Gr group is composed of a Grf group, a negative Grm group, and a Grr group in order from the object side.
At the time of scaling, the distance between the first lens group and the second lens group and the distance between the second lens group and the Gr group change.
At least one of the scaling time and the focusing time, the distance between the Grf group and the Grm group and the distance between the Grm group and the Grr group change.
The Grf group has a Grf convex lens arranged on the most object side of the Grf group, and at least one Grf concave lens.
A zoom lens that satisfies the following conditional expression.
1.60 <ndGrfp <2.50 ・ ・ ・ ・ ・ ・ (1)
1.82 <ndGrfn <2.50 ・ ・ ・ ・ ・ ・ (2)
42 <vdGrmn <100 ・ ・ ・ ・ ・ ・ (3)
here,
ndGrfp: Refractive index of the Grf convex lens on the d line
ndGrfn: Refractive index of the Grf concave lens on the d line
vdGrmn: The minimum Abbe number in the d-line of the concave lens included in the Grm group. The zoom lens according to claim 1, wherein the Grf convex lens satisfies the following conditional expression.
10.0 <vdGrfp <35.0 ・ ・ ・ ・ ・ (4)
here
vdGrfp: Abbe number on the d-line of the Grf convex lens The zoom lens according to claim 1 or 2, wherein the Grf concave lens satisfies the following conditional expression.
10.0 <vdGrfn <40.0 ・ ・ ・ ・ ・ (5)
here
vdGrfn: Abbe number on the d-line of the Grf concave lens The zoom lens according to claim 1, wherein the Grm group is a focusing group. The zoom lens according to claim 1, wherein the Grm group satisfies the following conditional expression.
-5 <fGrm / fw <-0.1 ・ ・ ・ ・ ・ (6)
here
fGrm: Focal length of the Grm group
fw: Focal length at the wide-angle end of the zoom lens The zoom lens according to claim 1, which has an aperture diaphragm and satisfies the following conditional expression.
0.01 <Tsfw / fw <5.0 ・ ・ ・ ・ ・ (7)
here
Tsfw: Distance between the aperture stop and the Grm group at the wide-angle end
fw: Focal length at the wide-angle end of the zoom lens The zoom lens according to claim 1, wherein the Grf group has at least two Grf concave lenses. The zoom lens according to claim 1, wherein the Grf concave lens has a concave surface on the image side. The zoom lens according to claim 1, wherein the Grf concave lens is a junction lens. The zoom lens according to claim 1, wherein the Grm group comprises a single lens. The zoom lens according to claim 1, wherein the Gr group has a vibration-proof lens system that moves in a direction perpendicular to the optical axis to change the imaging position. The zoom lens according to claim 11, wherein the anti-vibration lens system has a lens having an aspherical surface on at least one surface. The zoom lens according to claim 11 or 12, which satisfies the following conditional expression.
-10 <(1-βvc) × βvcr <-0.10 ・ ・ ・ (8)
Here, βvc: lateral magnification of the anti-vibration lens system at the telephoto end βvcr: composite lateral magnification of all lenses arranged on the image side of the anti-vibration lens system at the telephoto end The zoom lens according to claim 11, wherein the anti-vibration lens system comprises a single lens. The zoom lens according to one of claims 1 to 14 and an image pickup element provided on the image side of the zoom lens and converting an optical image formed by the zoom lens into an electrical signal are provided. An image pickup device characterized by this.

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