Zoom lens and image capturing device

Abstract

To provide a zoom lens that offers both high optical performance and a reduced product size, and to provide an image capturing device.SOLUTION: A zoom lens provided herein consists of, in order from the object side, a first lens group (G1) having positive refractive power, a second lens group (G2) having negative refractive power, and a rear group having positive refractive power, the rear group comprising an intermediate lens group M1 having positive refractive power and an intermediate lens group M2 having positive refractive power arranged in order from the object side. The zoom lens has specific optical characteristics represented by specific expressions.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a zoom lens and an imaging device.

Background Art

[0002] In an imaging device using a solid-state imaging device such as a digital camera or a video camera, due to the recent progress in high pixel density of the solid-state imaging device, the lens system is required to have higher performance than before. In addition, with the miniaturization of cameras, there is an increasing demand for miniaturization of the optical system.

[0003] Under such circumstances, for example, Patent Documents 1 to 3 disclose inventions of zoom lenses. Patent Document 1 discloses a zoom lens that is a so-called standard zoom for single-lens reflex cameras. Patent Document 2 discloses a zoom lens that is a so-called high-magnification zoom for mirrorless cameras. Patent Document 3 discloses a zoom lens that is a so-called large-aperture zoom for mirrorless cameras.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] The zoom lenses disclosed in Patent Documents 1 and 2 both have a positive magnification for the lens group arranged third from the object side, the light emitted to the image plane side of the lens group arranged third from the object side becomes divergent light, and the lens arranged on the image plane side of the lens group arranged third from the object side becomes large. For this reason, it is difficult to reduce the diameter of the product in the zoom lens described in Patent Document 1. Further, in the zoom lenses described in Patent Documents 1 and 2, the moving amount of the fourth lens group during zooming is also large, and it is difficult to reduce both the diameter and the length of the product.

[0006] In the zoom lens disclosed in Patent Document 3, the lens group arranged third from the object side during zooming is demagnified, has a weak refractive power, and the moving distance of each lens group is large. For this reason, it is difficult to miniaturize the product in the zoom lens described in Patent Document 3.

[0007] Therefore, an object of the present invention is to provide a zoom lens and an imaging device that achieve both high optical performance and miniaturization of the product even in a zoom lens with a zoom ratio exceeding 10 times.

Means for Solving the Problems

[0008] In order to solve the above problems, a zoom lens according to an aspect of the present invention is a zoom lens having a plurality of lens groups, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a rear group which is a set of lens groups and has a positive refractive power as a whole, the rear group has, in order from the object side, an intermediate lens group M1 having a positive refractive power and an intermediate lens group M2 having a positive refractive power, configured such that the interval between adjacent lens groups changes when zooming from the wide-angle end to the telephoto end, the intermediate lens group M1 has, in order from the object side, a set of lenses, a group A having a positive refractive power, a set of lenses, a group B having a negative refractive power, and a set of lenses, a group C having a positive refractive power, further satisfies the following condition A or condition B. (Condition A) At least one lens included in either the intermediate lens group M1 or the intermediate lens group M2 is an anti-vibration lens that moves in a direction intersecting the optical axis of the zoom lens, and when the lens group closest to the image plane side among the rear lens groups is defined as the lens group L, the following formulas (1) and (2) are satisfied. -1000 < βm1w < 0.00 ··· (1) -5.00 < mL / fw < -0.01 ··· (2) However, βm1w: Lateral magnification of the intermediate lens group M1 at infinity focus at the wide-angle end mL: Movement distance of the lens group L during zooming from the wide-angle end to the telephoto end when the movement distance from the object side to the image plane side is defined as positive fw: Focal length of the zoom lens at the wide-angle end (Condition B) At least one lens included in the intermediate lens group M1 and the lens group on the image plane side of the intermediate lens group M1 is an anti-vibration lens that moves in a direction intersecting the optical axis of the zoom lens, and the following formulas (3) and (4) are satisfied. 0.20 < Lt / ft < 1.30 ··· (3) 0.10 < fC / fM1 < 9.50 ··· (4) However, Lt: Overall length of the zoom lens at the telephoto end ft: Focal length of the zoom lens at the telephoto end fC: Focal length of the C group fM1: Focal length of the intermediate lens group M1

[0009] In addition, in order to solve the above problems, an imaging device according to an aspect of the present invention includes the above-described zoom lens and, on the image plane side of the zoom lens, an imaging element that converts an optical image formed by the zoom lens into an electrical signal.

Effect of the Invention

[0010] According to one aspect of the present invention, it is possible to provide a zoom lens and an imaging device that achieve both high optical performance and miniaturization of the product even in a zoom lens with a magnification ratio exceeding 10 times.

Brief Description of the Drawings

[0011]

Figure 1

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Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Mode for Carrying Out the Invention

[0012] Hereinafter, embodiments of the zoom lens and imaging device according to the present invention will be described. More specifically, this embodiment relates to a zoom lens and an imaging device suitable for an imaging device using a solid-state imaging device (such as a CCD or CMOS) such as a digital still camera or a digital video camera. However, the zoom lens and imaging device described below are one aspect of the zoom lens and imaging device according to the present invention, and the zoom lens and imaging device according to the present invention are not limited to the following aspects.

[0013] In this specification, the "zoom lens" is a general term for those including the optical characteristics specified in the present invention, and means one or both of the optical system itself that exhibits the optical characteristics and an article including the optical system.

[0014] 1. Zoom Lens 1-1. Optical Configuration The optical configuration of a zoom lens according to an embodiment of the present invention will be described. The zoom lens of the present embodiment is a zoom lens having a plurality of lens groups. The zoom lens includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a rear group having a positive refractive power as a whole. This configuration is preferable from the viewpoint of shortening the back focus and miniaturizing the product.

[0015] In this specification, the "lens group" means a set of one or more lenses that interlock in the zoom operation. The lenses in the lens group move while maintaining their relative positional relationship during the zoom operation. The zoom operation is performed by changing the distance between the lens groups, and the distance between the lenses belonging to the same lens group does not change during the zoom operation.

[0016] The rear group is a set of lens groups and has a positive refractive power as a whole. The rear group includes, in order from the object side, an intermediate lens group M1 and an intermediate lens group M2.

[0017] The intermediate lens group M1 has a positive refractive power as a whole for the entire lens group. This configuration is preferable from the viewpoint of converting the divergent light from the second lens group having a negative refractive power into convergent light and suppressing the height of the light beam passing through the lens disposed on the image plane side of the M1 group, thereby miniaturizing the product. The intermediate lens group M1 includes, in order from the object side, a group A which is a set of lenses, a group B which is a set of lenses, and a group C which is a set of lenses.

[0018] The group A has a positive refractive power. This configuration is preferable from the viewpoint of converting the divergent light from the second lens group having a negative refractive power into convergent light and suppressing the height of the light beam passing through the lens disposed on the image plane side of the group A, thereby miniaturizing the product.

[0019] Group B has a negative refractive power. This configuration is preferable from the viewpoint of correcting spherical aberration and field curvature that occur in Group A. By having at least one concave lens and at least one convex lens in Group B, it becomes possible to correct chromatic aberration within Group B. Therefore, this configuration is preferable from the viewpoint of further suppressing chromatic aberration variation during zooming. It is preferable for Group B to have a cemented lens composed of one or more concave lenses and one or more convex lenses from the viewpoint of suppressing the influence of manufacturing errors during the assembly of the zoom lens.

[0020] Group C has a positive refractive power. This configuration is preferable from the viewpoint of converting the divergent light from Group B having a negative refractive power into convergent light, suppressing the height of the light rays passing through the lens disposed on the image plane side of Group C, and miniaturizing the product. It is preferable for Group C to have a concave lens from the viewpoints of correcting field curvature and longitudinal chromatic aberration. If Group C has at least one concave lens and at least one convex lens, it becomes possible to correct chromatic aberration within Group C. Therefore, it is preferable for Group C to have at least one concave lens and at least one convex lens from the viewpoint of suppressing chromatic aberration variation during shake correction. It is preferable for Group C to have a cemented lens composed of one or more concave lenses and one or more convex lenses from the viewpoint of suppressing the influence of manufacturing errors during the assembly of the zoom lens.

[0021] The intermediate group M1 may have a further group which is a set of lenses. On the other hand, from the viewpoint of miniaturizing the zoom lens, the intermediate group M1 may have a configuration consisting only of Group A, Group B, and Group C.

[0022] The intermediate lens group M2 has a positive refractive power as a whole for the entire lens group. This configuration is preferable from the viewpoint of suppressing the height of the light rays passing through the lens disposed on the image plane side of Group M2 and miniaturizing the product.

[0023] At least one lens included in the intermediate lens group M1 and the lens group on the image plane side of the intermediate lens group M1 is an anti-shake lens. This configuration is preferable from the viewpoint of miniaturizing the anti-shake lens. At least one lens included in either the intermediate lens group M1 or the intermediate lens group M2 may be an anti-shake lens. This configuration is preferable from the viewpoint of miniaturizing the anti-shake lens. For example, from the viewpoint of realizing better optical performance, it is preferable that the C group is an anti-shake lens.

[0024] The anti-shake lens may move in a direction intersecting the optical axis of the optical system of the zoom lens. The anti-shake lens is usually arranged in the zoom lens so as to move in a direction perpendicular to the optical axis in response to the vibration of the zoom lens.

[0025] In this specification, the "focal length of the zoom lens" means the focal length of the optical system including from the lens on the most object side to the lens on the most image plane side. In this specification, the "focal length of the zoom lens at the wide-angle end" is the focal length at the wide-angle end when focused at infinity. In this specification, the "focal length of the zoom lens at the telephoto end" is the focal length at the telephoto end when focused at infinity. The zoom lens may further include optical elements outside the above range. For example, it may include an optical element that blocks light of a specific wavelength such as a cover glass of an imaging element or an infrared cut filter, or may not include it. Also, in this specification, the distance from the object-side lens surface of the lens on the most object side on the optical axis of the zoom lens to the image plane is referred to as the "overall length".

[0026] The rear group may have a lens group L on the most image plane side. The lens group L is preferably a lens group having a negative refractive power from the viewpoint of optimizing the zooming action of each lens group. Further, the lens group L preferably has at least one convex lens from the viewpoints of suppressing the height of the passing light rays and the variation of the magnification chromatic aberration during zooming.

[0027] The zoom lens may have a lens group F adjacent to the image plane side of the intermediate lens group M2. Having the lens group F is preferable from the viewpoint of miniaturizing the focusing mechanism due to the converging action of the intermediate lens group M1 and the intermediate lens group M2. The lens group F may have a negative refractive power as a whole from the viewpoint of thinning and miniaturizing the focusing mechanism. The lens group F may be composed of a single lens (single lens) from the viewpoint of further enhancing the above effects.

[0028] In this specification, the "single lens (single lens)" refers to a single lens (optical element) having one optical surface on each of the object side and the image plane side, and those with various coatings such as an antireflection film and a protective film on the optical surface are also included in the single lens. The shape of the optical surface of the single lens is not particularly limited. For example, the shape of the optical surface of the single lens may be either a spherical lens or an aspherical lens. Also, for example, the shape of the optical surface of the single lens includes a so-called composite aspherical lens in which an aspherical surface is formed on the surface of a spherical lens with a thin resin layer, and one side thereof may be a plane. The manufacturing method of the single lens is not particularly limited. For example, the single lens may include various lenses manufactured by polishing, mold molding, or injection molding, etc. Also, the material of the single lens is not particularly limited. For example, the single lens may be a glass lens made of glass material or a resin lens made of resin material, etc.

[0029] In addition to the above configuration, the zoom lens may further include a lens group. For example, a third lens group having a negative refractive power may be disposed between the second lens group G2 and the intermediate lens group M1. This configuration is preferable from the viewpoint of suppressing fluctuations in spherical aberration and field curvature during zooming. Also, for example, a third lens group G3 having a positive refractive power may be disposed between the lens group F and the lens group L. This configuration is preferable from the viewpoints of suppressing fluctuations in field curvature during zooming and miniaturizing the lens group L. On the other hand, the zoom lens according to this embodiment may be a zoom lens composed only of the first lens group, the second lens group, and the rear group. This configuration is preferable from the viewpoint of miniaturizing the zoom lens.

[0030] (3) Aperture stop The zoom lens may include a diaphragm. The diaphragm may be arranged on the object side of the intermediate lens group M1, adjacent to the intermediate lens group M1, or may be arranged inside the intermediate lens group M1.

[0031] 1-2. Operation (1) Zoom When the zoom lens zooms from the wide-angle end to the telephoto end or from the telephoto end to the wide-angle end, it zooms by changing the air space on the optical axis between adjacent lens groups.

[0032] When the second lens group moves from the wide-angle end to the telephoto end, it is preferably moved from the image plane side to the object side. The movement locus of the second lens group is not particularly limited. For example, the second lens group may first move to the image plane side and then move to the object side. Also, for example, the second lens group may move first more slowly and then gradually faster. This movement pattern is preferable from the viewpoint of miniaturizing the first lens group.

[0033] (2) Focusing When the zoom lens focuses, it is preferable that the lens group F moves. Due to the converging action of the intermediate lens group M2, the height of the light beam becomes lower, so that it is possible to reduce the diameter of the lens group F arranged on the image plane side of the intermediate lens group M2. Therefore, making the lens group F the lens group that moves during focusing is preferable from the viewpoint of miniaturizing the focus mechanism.

[0034] 1-3. Formula The zoom lens preferably adopts the above-described configuration and satisfies at least one of the following formulas.

[0035] 1-2-1. Formula (1) -1000 < βm1w < 0.00 ··· (1) However, βm1w: Lateral magnification of the intermediate lens group M1 at infinity focus at the wide-angle end

[0036] Equation (1) defines the lateral magnification of the intermediate lens group M1 at infinity focus at the wide-angle end of the optical system. Satisfying the range defined by Equation (1) is preferable from the viewpoint of reducing the diameter of the lens group on the image plane side of the intermediate lens group M1, since the divergent light incident on the intermediate lens group M1 can be converged light on the image side of the intermediate lens group M1.

[0037] If βm1w is below the lower limit value, the overall length may become long.

[0038] If βm1w exceeds the upper limit value, the lateral magnification of the intermediate lens group M1 at infinity focus at the wide-angle end becomes 0 or positive, the image side of the intermediate lens group M1 remains divergent light, the lens group on the image plane side of the intermediate lens group M1 has a larger diameter, and it becomes difficult to miniaturize the product, so it is not preferable.

[0039] From the viewpoint of miniaturizing the overall length, βm1w is preferably greater than -100.00, more preferably greater than -50.00, still more preferably greater than -10.00, even more preferably greater than -5.00, and particularly preferably greater than -4.00. From the viewpoint of miniaturizing the intermediate lens group M1, βm1w is preferably less than -0.50, more preferably less than -0.70, and still more preferably less than -1.00.

[0040] 1-2-2. Equation (2) -5.00 < mL / fw < -0.01 ··· (2) However, mL: The moving distance of the lens group L during zooming from the wide-angle end to the telephoto end when the moving distance from the object side to the image side is defined as positive fw: The focal length of the zoom lens at the wide-angle end

[0041] Equation (2) defines the ratio between the moving distance of the lens group L during zooming from the wide-angle end to the telephoto end and the focal length of the zoom lens at the wide-angle end. By satisfying the range defined by Equation (2), the lens group L exhibits a magnification effect during zooming. Therefore, satisfying Equation (2) is preferable from the viewpoint of achieving high magnification while suppressing the moving distance of each lens group.

[0042] If it is below the lower limit of mL / fw, the moving distance of the lens group L during zooming may increase. As a result, the overall length of the zoom lens at the telephoto end becomes longer, which is not desirable from the perspective of miniaturization of the product.

[0043] If it exceeds the upper limit of mL / fw, the lens group L will move toward the image plane side during zooming from the wide-angle end to the telephoto end. As a result, the back focus at the wide-angle end becomes longer, which is not desirable from the perspective of miniaturization of the product.

[0044] From the perspective of shortening the zoom lens, mL / fw is preferably greater than -4.00, and more preferably greater than -3.00. From the perspective of suppressing the moving distance of each lens group, mL / fw is preferably less than -0.50, and more preferably less than -0.70.

[0045] 1 - 2 - 3. Equation (3) 0.20 < Lt / ft < 1.30 ··· (3) However, Lt: Overall length of the zoom lens at the telephoto end ft: Focal length of the zoom lens at the telephoto end

[0046] Equation (3) defines the ratio of the overall length of the optical system to the focal length of the optical system at the telephoto end. Satisfying the range defined by Equation (3) is preferable from the perspective of achieving both miniaturization of the product and good optical performance.

[0047] If it is below the lower limit of Lt / ft, the overall length of the optical system at the telephoto end may become shorter than the appropriate value. As a result, it becomes difficult to correct spherical aberration and coma aberration generated on each lens surface, and it becomes difficult to realize a zoom lens having good optical performance, which is not desirable. The "appropriate value" of the overall length of the optical system mainly means a numerical range that can achieve both good optical performance and miniaturization of the product.

[0048] When the upper limit value of Lt / ft is exceeded, the overall length of the optical system at the telephoto end may become longer than the appropriate value. As a result, it becomes difficult to miniaturize the product, which is not desirable.

[0049] From the viewpoint of realizing good optical performance, Lt / ft is preferably greater than 0.30, more preferably greater than 0.40. From the viewpoint of shortening the overall length of the optical system, Lt / ft is preferably less than 1.00, more preferably less than 0.90, and even more preferably less than 0.80.

[0050] 1-2-4. Equation (4) 0.10 < fC / fM1 < 9.50 ··· (4) However, fC: Focal length of group C fM1: Focal length of intermediate lens group M1

[0051] Equation (4) defines the ratio between the focal length of group C and the focal length of intermediate lens group M1 that the optical system has. By satisfying the range defined by Equation (4), it is possible to maintain good aberration correction while strengthening the refractive power of intermediate lens group M1, and to lower the incident position of the light rays incident on the lens group on the image plane side than intermediate lens group M1. Therefore, satisfying Equation (4) is preferable from the viewpoint of achieving both miniaturization of the product and good optical performance.

[0052] When the lower limit value of fC / fM1 is exceeded, the refractive power of group C may become stronger than the appropriate value, or the refractive power of intermediate lens group M1 may become weaker than the appropriate value. As a result, the aberration correction of intermediate lens group M1 does not work properly, and it becomes difficult to realize a zoom lens having good optical performance, which is not desirable. Note that the "appropriate value" of the refractive power of group C and the "appropriate value" of the refractive power of intermediate lens group M1 may be appropriately determined mainly from the range where good optical performance and miniaturization of the product are compatible.

[0053] When exceeding the upper limit value of fC / fM1, the refractive power of group C may become weaker than the appropriate value, or the refractive power of the intermediate lens group M1 may become stronger than the appropriate value. As a result, it becomes difficult to lower the incident position of the light rays incident on the lens group on the image plane side than the intermediate lens group M1, which is not desirable.

[0054] From the viewpoint of realizing good optical performance, fC / fM1 is preferably greater than 0.30, more preferably greater than 0.50, still more preferably greater than 0.70, still more preferably greater than 0.90, and even more preferably greater than 1.00. From the viewpoint of realizing miniaturization of the product, fC / fM1 is preferably less than 9.00, more preferably less than 7.00, still more preferably less than 5.00, still more preferably less than 3.00, and even more preferably less than 2.00.

[0055] 1-2-5. Equation (5) 0.10 < Lt / ft < 3.00 ··· (5)

[0056] Equation (5) defines the ratio of the overall length of the optical system at the telephoto end to the focal length of the zoom lens at the telephoto end. Satisfying the range defined by Equation (5) is preferable from the viewpoint of achieving both miniaturization of the product and good optical performance.

[0057] When falling below the lower limit value of Lt / ft, the overall length of the zoom lens at the telephoto end is shorter than the appropriate value. As a result, it becomes difficult to correct spherical aberration, coma aberration, etc. generated at each lens surface, and it becomes difficult to realize a zoom lens having good optical performance, which is not desirable.

[0058] When exceeding the upper limit value of Lt / ft, the overall length of the zoom lens at the telephoto end is longer than the appropriate value. As a result, it becomes difficult to miniaturize the product, which is not desirable.

[0059] From the perspective of corrections such as spherical aberration and coma aberration, Lt / ft is preferably greater than 0.30, more preferably greater than 0.40. From the perspective of shortening the overall length of the zoom lens, Lt / ft is preferably less than 1.00, more preferably less than 0.90, and even more preferably less than 0.80.

[0060] 1-2-6. Equation (6) 0.10 < fC / fM1 < 20.00 ··· (6)

[0061] Equation (6) defines the ratio between the focal length of the C group of the optical system and the focal length of the intermediate lens group M1. Satisfying the range defined by Equation (6) is preferable from the perspective of maintaining good aberration correction while strengthening the refractive power of the intermediate lens group M1. Also, satisfying the range defined by Equation (6) makes it possible to lower the incident position of the light rays incident on the lens group on the image plane side of the intermediate lens group M1, and is preferable from the perspective of achieving both miniaturization of the product and good optical performance.

[0062] If it is below the lower limit value of fC / fM1, the refractive power of the C group may become stronger than the appropriate value, or the refractive power of the intermediate lens group M1 may become weaker than the appropriate value. As a result, the aberration correction within the intermediate lens group M1 deteriorates, making it difficult to realize a zoom lens with good optical performance, so it is not desirable.

[0063] If it exceeds the upper limit value of fC / fM1, the refractive power of the C group may become weaker than the appropriate value, or the refractive power of the intermediate lens group M1 may become stronger than the appropriate value. For this reason, the aberration correction within the intermediate lens group M1 does not satisfy the appropriate value, making it difficult to realize a zoom lens with good optical performance, so it is not desirable.

[0064] fC / fM1 is preferably greater than 0.30, more preferably greater than 0.50, still more preferably greater than 0.70, further more preferably greater than 0.90, and particularly preferably greater than 1.00 from the viewpoint of making the aberration correction in the intermediate lens group M1 within an appropriate range. fC / fM1 is preferably less than 9.00, more preferably less than 7.00, still more preferably less than 5.00, further more preferably less than 3.00, and particularly preferably less than 2.00 from the viewpoint of realizing good optical performance.

[0065] 1-2-7. Equation (7) -1000 < βm1w < 0.00 ··· (7)

[0066] Equation (7) defines the lateral magnification at infinity focus of the intermediate lens group M1 at the wide-angle end of the optical system. By satisfying the range defined by Equation (7), the divergent light incident on the intermediate lens group M1 becomes convergent light on the image plane side of the intermediate lens group M1. As a result, the lens group on the image plane side of the intermediate lens group M1 can be reduced in diameter, which is preferable from the viewpoint of miniaturizing the product.

[0067] When the upper limit value of βm1w is exceeded, the lateral magnification at infinity focus of the intermediate lens group M1 at the wide-angle end becomes 0 or positive, and the divergent light of the intermediate lens group M1 is emitted from the image plane side as it is. As a result, the lens group on the image plane side of the intermediate lens group M1 is increased in diameter, making it difficult to miniaturize the product, which is not desirable.

[0068] βm1w is preferably greater than -100.00, more preferably greater than -50.00, still more preferably greater than -10.00, further more preferably greater than -5.00, and particularly preferably greater than -4.00 from the viewpoint of miniaturizing the product. βm1w is preferably less than -0.50, more preferably less than -0.70, and still more preferably less than -1.00 from the viewpoint of miniaturizing the product.

[0069] 1-2-8. Equation (8) -5.00 < mL / fw < -0.01 ··· (8)

[0070] Equation (8) defines the ratio of the moving distance of the lens group L during zooming from the wide-angle end to the telephoto end to the focal length of the zoom lens at the wide-angle end. By satisfying the range defined by Equation (8), the lens group L exhibits a magnification effect during zooming. As a result, it is possible to achieve further higher magnification while suppressing the moving distance of each lens group.

[0071] If it is below the lower limit value of mL / fw, the lens group L will move toward the image plane side during zooming from the wide-angle end to the telephoto end. As a result, the back focus becomes longer, which is not desirable from the perspective of miniaturization of the product.

[0072] If it exceeds the upper limit value of mL / fw, it indicates that the L group moves toward the image side during zooming, making it difficult to ensure the necessary back focus and causing difficulties in miniaturization of the product, which is not desirable.

[0073] From the perspective of shortening the zoom lens, the lower limit value of mL / fw is preferably -4.00, more preferably -3.00. From the perspective of suppressing the moving distance of each lens group, the upper limit value of mL / fw is preferably -0.50, more preferably -0.70.

[0074] 1-2-9. Equation (9) 0.10 < f1 / fw < 10.00 ··· (9) However,[[]] f1: Focal length of the first lens group fw: Focal length of the zoom lens at the wide-angle end

[0075] Equation (9) defines the ratio of the focal length of the first lens group of the optical system to the focal length of the zoom lens at the wide-angle end. Satisfying the range defined by Equation (9) is preferable from the perspective of shortening the moving distance of the first lens group during zooming from the wide-angle end to the telephoto end, suppressing the occurrence of spherical aberration and coma aberration generated by the first lens group, and realizing both miniaturization of the product and good optical performance.

[0076] When it is lower than the lower limit value of f1 / fw, the refractive power of the first lens group may be stronger than the appropriate value. As a result, it becomes difficult to correct the spherical aberration and coma aberration generated in the first lens group in the entire zoom lens system, which is not desirable. Note that the "appropriate value" of the refractive power of the first lens group may be appropriately determined mainly from the range where good optical performance and miniaturization of the product are compatible.

[0077] When it exceeds the upper limit value of f1 / fw, the refractive power of the first lens group may be weaker than the appropriate value. As a result, the moving distance of the first lens group during zooming from the wide-angle end to the telephoto end becomes larger than the appropriate value, making it difficult to miniaturize the product, which is not desirable.

[0078] From the viewpoint of realizing good optical performance, f1 / fw is preferably greater than 1.00, more preferably greater than 1.50, still more preferably greater than 2.00, and even more preferably greater than 2.50. From the viewpoint of miniaturization of the product, f1 / fw is preferably less than 9.00, more preferably less than 8.00, still more preferably less than 7.00, and even more preferably less than 6.00.

[0079] 1-2-10. Equation (10) 0.90 < βm1t / βm1w < 10.00 ··· (10) However, βm1w: Lateral magnification of the intermediate lens group M1 at infinity focus at the wide-angle end βm1t: Lateral magnification of the intermediate lens group M1 at infinity focus at the telephoto end

[0080] Equation (10) defines the zoom ratio of the intermediate lens group M1 of the optical system. By satisfying the range defined by Equation (10), the zooming burden of the intermediate lens group M1 and other lens groups during zooming from the wide-angle end to the telephoto end can be optimized, and the moving distance of each lens group during zooming can be further suppressed. Therefore, satisfying the range defined by Equation (10) is preferable from the viewpoint of suppressing fluctuations in optical performance during zooming of the zoom lens and realizing both miniaturization of the product and good optical performance.

[0081] When it is lower than the lower limit value of βm1t / βm1w, the intermediate lens group M1 acts as a reducing power, and the moving distance of the lens groups other than the intermediate lens group M1 may become larger than the appropriate value. As a result, it becomes difficult to miniaturize the product, which is not desirable. The "appropriate value" of the moving distance of the lens groups other than the intermediate lens group M1 may be appropriately determined mainly from the range where good optical performance and miniaturization of the product are compatible.

[0082] When it exceeds the upper limit value of βm1t / βm1w, the zooming action of the intermediate lens group M1 tends to become larger than the appropriate value, the moving distance of the intermediate lens group M1 during zooming from the wide-angle end to the telephoto end may become larger than the appropriate value, or the refractive power of the intermediate lens group M1 may become stronger than the appropriate value. As a result, it becomes difficult to achieve both miniaturization of the product and good optical performance, which is not desirable. The "appropriate value" of the zooming action of the intermediate lens group M1 may be appropriately determined mainly from the range where good optical performance and miniaturization of the product are compatible.

[0083] From the viewpoint of miniaturization of the product, βm1t / βm1w is preferably greater than 1.00, more preferably greater than 1.50, and even more preferably greater than 1.80. From the viewpoint of achieving both miniaturization of the product and good optical performance, βm1t / βm1w is preferably less than 8.00, more preferably less than 6.00, and even more preferably less than 5.00.

[0084] 1-2-11. Equation (11) 0.50 < (1 - βct) × βcrt < 6.00 ··· (11) However, βct: Lateral magnification of group C at infinity focus at the telephoto end βcrt: Combined lateral magnification of the lens groups on the image plane side from group C at infinity focus at the telephoto end

[0085] Equation (11) defines the shake correction coefficient at the telephoto end of group C when group C is composed of an anti-shake lens. Satisfying the range defined by Equation (11) is preferable from the viewpoint of suppressing the moving distance of the anti-shake lens during shake correction and miniaturizing the anti-shake lens unit.

[0086] If it is less than the lower limit value of (1 - βct)×βcrt, it indicates that the shake correction coefficient is smaller than the appropriate value, and the moving distance required during shake correction becomes larger than the appropriate value. As a result, it becomes difficult to miniaturize the anti-shake mechanism, which is not desirable.

[0087] If it exceeds the upper limit value of (1 - βct)×βcrt, it indicates that the shake correction coefficient is larger than the appropriate value, and the refractive power of the anti-shake lens and its subsequent group is stronger than the appropriate value, resulting in a greater deterioration of the optical performance during shake correction, which is not desirable. Note that the "appropriate value" of the shake correction coefficient may be appropriately determined from the range where good optical performance during shake correction and miniaturization of the anti-shake lens unit are compatible.

[0088] (1 - βct)×βcrt is preferably greater than 0.70, more preferably greater than 0.80, still more preferably greater than 0.90, and even more preferably greater than 1.00 from the viewpoint of miniaturizing the anti-shake mechanism. (1 - βct)×βcrt is preferably less than 5.00, preferably less than 4.50, more preferably less than 4.00, more preferably less than 3.50, more preferably less than 3.00, more preferably less than 2.80, and more preferably less than 2.60 from the viewpoint of realizing good optical performance.

[0089] 1 - 2 - 12. Equation (12) 1.40 < Ndp < 1.75 ··· (12) However, Ndp: Refractive index of the convex lens included in group C with respect to the d line

[0090] Equation (12) defines the refractive index of the convex lens in Group C of the optical system with respect to the d-line. Satisfying the range defined by Equation (12) is preferable from the perspective of selecting glass with a low specific gravity. When Group C with such a convex lens is used as an anti-vibration lens, it becomes possible to further reduce the weight of the anti-vibration lens. As a result, further miniaturization and weight reduction of the anti-vibration mechanism become possible.

[0091] If it is below the lower limit value of Ndp, since the refractive index of the convex lens in Group C with respect to the d-line is lower than the appropriate value, in order to obtain the necessary refractive power of Group C, it becomes necessary to increase the curvature radius. As a result, it becomes difficult to correct spherical aberration and coma aberration, which is not desirable.

[0092] If it exceeds the upper limit value of Ndp, since the refractive index of the convex lens in Group C with respect to the d-line is higher than the appropriate value, glass with a high specific gravity will be adopted. As a result, it becomes difficult to reduce the weight of the anti-vibration mechanism, which is not desirable. Note that the "appropriate value" of the refractive index of the convex lens in Group C with respect to the d-line may be appropriately determined mainly from the range where good optical performance and weight reduction of the anti-vibration lens unit are compatible.

[0093] From the perspective of realizing good optical performance, Ndp is preferably greater than 1.45, and more preferably greater than 1.48. From the perspective of weight reduction of the anti-vibration lens unit, Ndp is preferably less than 1.70, more preferably less than 1.65, even more preferably less than 1.60, and still more preferably less than 1.55.

[0094] 1-2-13. Equation (13) 50 < νdp < 100 ··· (13) However, νdp: Abbe number of the convex lens in Group C

[0095] Equation (13) defines the Abbe number of the convex lens in Group C. Satisfying the range defined by Equation (13) is preferable from the perspective of suppressing fluctuations in axial chromatic aberration during zooming and realizing good optical performance.

[0096] When it is below the lower limit value of νdp, the Abbe number of the convex lens in Group C becomes smaller than the appropriate value, and it becomes difficult to suppress the variation of the axial chromatic aberration during zooming, which is not desirable. The "appropriate value" of the Abbe number of the convex lens in Group C may be appropriately determined mainly from the range in which good optical performance can be achieved.

[0097] From the viewpoint of realizing good optical performance, νdp is preferably greater than 55.00, more preferably greater than 60.00, still more preferably greater than 61.00, even more preferably greater than 62.00, and further preferably greater than 64.00. From the viewpoint of realizing good optical performance, νdp is preferably less than 95.00, more preferably less than 90.00, and still more preferably less than 85.00.

[0098] 1-2-14. Equation (14) -20.00 < fB / fM1 < -0.10 ··· (14) However, fB: Focal length of Group B fM1: Focal length of the intermediate lens group M1

[0099] Equation (14) defines the ratio between the focal length of Group B and the focal length of the intermediate lens group M1. Satisfying the range defined by Equation (14) is preferable from the viewpoint of correcting the spherical aberration and coma aberration generated in the groups having positive refractive power in the intermediate lens group M1, that is, Group A and Group C, and strengthening the refractive power of the intermediate lens group M1. Therefore, it is preferable from the viewpoint of achieving both miniaturization of the product and good optical performance.

[0100] When it is below the lower limit value of fB / fM1, the refractive power of Group B may be weaker than the appropriate value, or the refractive power of the intermediate lens group M1 may be stronger than the appropriate value. As a result, insufficient correction of spherical aberration and coma aberration occurs in the intermediate lens group M1, which is not desirable from the viewpoint of obtaining good optical performance.

[0101] When exceeding the upper limit of fB / fM1, the refractive power of Group B may become stronger than the appropriate value, or the refractive power of the intermediate lens group M1 may become weaker than the appropriate value. As a result, in the intermediate lens group M1, overcorrection of spherical aberration and coma aberration occurs, and the moving distance of the intermediate lens group M1 during zooming increases. Consequently, it becomes difficult to achieve both miniaturization of the product and good optical performance, which is not desirable. Note that the "appropriate value" of the refractive power of Group B may be appropriately determined mainly from the range where good optical performance and miniaturization of the product are compatible.

[0102] From the viewpoint of achieving good optical performance, fB / fM1 is preferably greater than -10.00, more preferably greater than -5.00, still more preferably greater than -4.50, even more preferably greater than -4.00, and further preferably greater than -3.50. From the viewpoint of achieving miniaturization of the product and good optical performance, fB / fM1 is preferably less than -0.20, more preferably less than -0.30, and still more preferably less than -0.40.

[0103] 1-2-15. Equation (15) 1.70 < Ndn < 2.20 ··· (15) However, Ndn: Refractive index of the concave lens in Group B with respect to the d-line

[0104] Equation (15) defines the refractive index of the concave lens in Group B with respect to the d-line. Satisfying the range defined by Equation (15) is preferable from the viewpoint of both correcting the spherical aberration and field curvature generated in the groups having positive refractive power in the intermediate lens group M1, that is, Group A and Group C, and strengthening the refractive power of the intermediate lens group M1. Therefore, satisfying Equation (15) is preferable from the viewpoint of achieving both miniaturization of the product and good optical performance.

[0105] When exceeding the upper limit of Ndn, overcorrection occurs for the spherical aberration and field curvature generated in the groups having positive refractive power in the intermediate lens group M1, that is, Group A and Group C, which is not desirable from the viewpoint of achieving good optical performance.

[0106] When it is below the lower limit value of Ndn, since the correction for spherical aberration and field curvature generated in the groups having positive refractive power in the intermediate lens group M1, that is, group A and group C, is insufficient, it is not desirable from the viewpoint of realizing good optical performance.

[0107] From the viewpoint of realizing good optical performance, Ndn is preferably greater than 1.75, more preferably greater than 1.80, still more preferably greater than 1.85, even more preferably greater than 1.90, and still even more preferably greater than 1.95. From the viewpoint of realizing good optical performance, Ndn is preferably less than 2.10, and more preferably less than 2.05.

[0108] 1-2-16. Equation (16) 0.50 < Xm1 / Xm2 < 2.00 ··· (16) However, Xm1: Moving distance of the intermediate lens group M1 during zooming from the wide-angle end to the telephoto end Xm2: Moving distance of the intermediate lens group M2 during zooming from the wide-angle end to the telephoto end

[0109] Equation (16) defines the ratio of the moving distances of the intermediate lens group M1 and the intermediate lens group M2 during zooming. Satisfying the range defined by Equation (16) is preferable from the viewpoint of being able to appropriately distribute the moving distances of each lens group and realizing miniaturization of the product.

[0110] When it is below the lower limit value of Xm1 / Xm2, the moving distance of the intermediate lens group M2 becomes larger than the appropriate value, and the change in the ray height during zooming becomes larger. As a result, it becomes difficult to miniaturize the intermediate lens group M2, which is not desirable. Note that the "appropriate value" of the moving distance of the intermediate lens group M2 may be appropriately determined mainly from the range where good optical performance and miniaturization of the product are compatible.

[0111] When the upper limit value of Xm1 / Xm2 is exceeded, the moving distance of the intermediate lens group M1 becomes larger than the appropriate value, and the change in the ray height during zooming becomes larger. As a result, it becomes difficult to miniaturize the intermediate lens group M1, which is not desirable. Note that the "appropriate value" of the moving distance of the intermediate lens group M1 may be appropriately determined mainly from the range where good optical performance and product miniaturization are compatible.

[0112] From the perspective of product miniaturization, Xm1 / Xm2 is preferably greater than 0.60, and more preferably greater than 0.65. From the perspective of product miniaturization, the upper limit value of Xm1 / Xm2 is preferably less than 1.80, more preferably less than 1.60, still more preferably less than 1.40, and even more preferably less than 1.20.

[0113] 1-2-17. Equation (17) 1.00 < β2t / β2w < 10.00 ··· (17) However, β2w: Lateral magnification of the second lens group at infinity focus at the wide-angle end β2t: Lateral magnification of the second lens group at infinity focus at the telephoto end

[0114] Equation (17) defines the zoom ratio of the second lens group of the optical system. Satisfying the range defined by Equation (17) is preferable from the perspective of realizing product miniaturization because the moving distances of each lens group can be appropriately distributed.

[0115] When the lower limit value of β2t / β2w is exceeded, the zoom ratio of the second lens group becomes smaller than the appropriate value, and the moving distance of the parts other than the second lens group during zooming of the zoom lens may become larger than the appropriate value, or the refractive power of the second lens group may be weaker than the appropriate value. As a result, it becomes difficult to achieve both product miniaturization and good optical performance, which is not desirable.

[0116] When the upper limit value of β2t / β2w is exceeded, the magnification ratio of the second lens group becomes larger than the appropriate value, and the moving distance of the second lens group during zooming of the zoom lens may become larger than the appropriate value, or the refractive power of the second lens group may become stronger than the appropriate value. As a result, it becomes difficult to achieve both miniaturization of the product and good optical performance, which is not desirable. Note that the "appropriate value" of the magnification ratio of the second lens group may be appropriately determined mainly from the range where good optical performance and miniaturization of the product are compatible. The "appropriate value" of the moving distance of the second lens group during zooming of the zoom lens may be appropriately determined mainly from the range where good optical performance and miniaturization of the product are compatible. The "appropriate value" of the refractive power of the second lens group may be appropriately determined mainly from the range where good optical performance and miniaturization of the product are compatible.

[0117] From the viewpoint of achieving both miniaturization of the product and good optical performance, β2t / β2w is preferably greater than 2.00, more preferably greater than 3.00, and even more preferably greater than 4.00. From the viewpoint of achieving both miniaturization of the product and good optical performance, β2t / β2w is preferably less than 9.50, more preferably less than 9.00, and even more preferably less than 8.50.

[0118] 1-2-18. Equation (18) 1.10 < βLt / βLw < 3.00 ··· (18) However, βLw: Lateral magnification of the lens group L at infinity focus at the wide-angle end βLt: Lateral magnification of the lens group L at infinity focus at the telephoto end

[0119] Equation (18) defines the magnification ratio of the lens group L of the optical system. Satisfying the range defined by Equation (18) is preferable from the viewpoint of realizing miniaturization of the product because the moving distances of the respective lens groups can be more appropriately distributed.

[0120] When exceeding the upper limit value of βLt / βLw, the zoom ratio of the lens group L becomes larger than the appropriate value, and the moving distance of the lens group L during zooming of the zoom lens may become larger than the appropriate value, or the refractive power of the lens group L may become stronger than the appropriate value. As a result, it becomes difficult to achieve both miniaturization of the product and good optical performance, which is not desirable.

[0121] When falling below the lower limit value of βLt / βLw, the zoom ratio of the lens group L becomes smaller than the appropriate value, and the moving distance other than the lens group L during zooming of the zoom lens may become larger than the appropriate value, or the refractive power of the L group may become weaker than the appropriate value. As a result, it becomes difficult to achieve both miniaturization of the product and good optical performance, which is not desirable.

[0122] From the viewpoint of achieving both miniaturization of the product and good optical performance, βLt / βLw is preferably greater than 1.10, more preferably greater than 1.20, still more preferably greater than 1.30, and even more preferably greater than 1.40. From the viewpoint of achieving both miniaturization of the product and good optical performance, βLt / βLw is preferably less than 2.80, more preferably less than 2.60, still more preferably less than 2.40, even more preferably less than 2.20, and even more preferably less than 2.00.

[0123] 1-2-19. Equation (19) When the entire lens on the image plane side of the intermediate lens group M2 is defined as the R group, it is preferable to satisfy the following equation (19). 1.50 < βRt / βRw < 5.00 ··· (19) However, βRw: Lateral magnification of the R group at infinity focus at the wide-angle end βRt: Lateral magnification of the R group at infinity focus at the telephoto end

[0124] Equation (19) defines the zoom ratio of the R group of the optical system. Satisfying the range defined by equation (19) is preferable from the viewpoint of realizing miniaturization of the product because the moving distances of the respective lens groups can be appropriately distributed.

[0125] When it is below the lower limit value of βRt / βRw, the magnification ratio of the R group may become smaller than the appropriate value, the moving distance of the lens group other than the R group during zooming of the zoom lens may become larger than the appropriate value, or the refractive power of the R group may become weaker than the appropriate value. As a result, it becomes difficult to achieve both miniaturization of the product and good optical performance, which is not desirable.

[0126] When it exceeds the upper limit value of βRt / βRw, the magnification ratio of the R group may become larger than the appropriate value, the moving distance of the lens group included in the R group during zooming of the zoom lens may become longer than the appropriate value, or the refractive power of the R group may become stronger than the appropriate value. As a result, it becomes difficult to achieve both miniaturization of the product and good optical performance, which is not desirable.

[0127] From the viewpoint of achieving both miniaturization of the product and good optical performance, βRt / βRw is preferably greater than 1.10, more preferably greater than 1.20, still more preferably greater than 1.30, and even more preferably greater than 1.40. From the viewpoint of achieving both miniaturization of the product and good optical performance, βRt / βRw is preferably less than 4.50, more preferably less than 4.00, still more preferably less than 3.50, even more preferably less than 3.00, and even more preferably less than 2.50.

[0128] 1 - 2 - 20. Equation (20) -20.00 < (1 - βft) 2 ×βfrt 2 < - 1.00 ··· (20) However, βft: Lateral magnification of lens group F at infinity focus at the telephoto end βfrt: Combined lateral magnification of the lens group on the image plane side of lens group F at infinity focus at the telephoto end

[0129] Equation (20) defines the play magnification of lens group F at the telephoto end (the ratio of the image plane movement amount to the single displacement amount of lens group F). Satisfying the range defined by Equation (20) is preferable from the perspective of achieving both miniaturization of the focusing mechanism and good optical performance because when focusing on a nearby object, the movement distance of lens group F is suppressed within a more appropriate range.

[0130] (1 - βft) 2 ×βfrt 2 If it is below the lower limit value of, the play magnification of lens group F may become smaller than the appropriate value. As a result, it may be necessary to increase the refractive power of lens group F or the lens group on its image plane side more than the appropriate value, which is not desirable from the perspective of suppressing focusing fluctuations when focusing on a nearby object. Note that the "appropriate value" of the play magnification of lens group F may be appropriately determined mainly from the range where good optical performance and product miniaturization are both achieved. The "appropriate value" of the refractive power of lens group F or the lens group on its image plane side may be appropriately determined mainly from the range where good optical performance and product miniaturization are both achieved.

[0131] (1 - βft) 2 ×βfrt 2 If it exceeds the upper limit value of, the play magnification of lens group F may become larger than the appropriate value, and as a result, the movement distance of lens group F when focusing on a nearby object may become larger than the appropriate value, which is not desirable. The "appropriate value" of the movement distance of lens group F may be appropriately determined mainly from the range where good optical performance and product miniaturization are both achieved.

[0132] (1 - βft) 2 ×βfrt 2 is preferably greater than -18.00, more preferably greater than -16.00, even more preferably greater than -14.00, and still more preferably greater than -12.00 from the perspective of more suitably suppressing focusing fluctuations. (1 - βft) 2 ×βfrt 2From the perspective of shortening the moving distance of the lens group F during focusing, it is preferably less than -2.00, more preferably less than -3.00, more preferably less than -4.00, more preferably less than -5.00, more preferably less than -6.00, more preferably less than -7.00, more preferably less than -8.00, and even more preferably less than -9.00.

[0133] 2. Imaging device Next, an imaging device according to an embodiment of the present invention will be described. The imaging device includes the zoom lens according to the above-described embodiment and an imaging element provided on the image plane side of the zoom lens for converting the optical image formed by the zoom lens into an electrical signal.

[0134] Here, there is no limitation on the imaging element, and solid-state imaging elements such as CCD (Charge Coupled Device) sensors and CMOS (Complementary Metal Oxide Semiconductor) sensors can be used for the imaging element, and silver halide films, infrared cut filters (IRCF), etc. can also be used. The imaging device according to the present embodiment is suitable for imaging devices using the above solid-state imaging elements such as digital cameras and video cameras. Further, the imaging device may be a lens-fixed imaging device in which the lens is fixed to the housing, or a lens-exchangeable imaging device such as a single-lens reflex camera and a mirrorless single-lens camera. In particular, the zoom lens according to the present embodiment can ensure a back focus suitable for an interchangeable lens system. Therefore, it is suitable for imaging devices such as single-lens reflex cameras equipped with an optical viewfinder, a phase difference sensor, and a reflex mirror for branching light to these.

[0135] FIG. 13 is a diagram schematically showing an example of the configuration of the imaging device according to the present embodiment. As shown in FIG. 13, the mirrorless single-lens camera 1 has a main body 2 and a lens barrel 3 detachably attached to the main body 2. The mirrorless single-lens camera 1 is an aspect of the imaging device.

[0136] The lens barrel 3 has a zoom lens. The zoom lens 30 includes lenses L1 to L20. The zoom lens is configured to satisfy, for example, the above-described equations (1) and (2), or equations (3) and (4). Note that an aperture S is disposed on the object side of lens L8.

[0137] The lens group composed of lenses L1 to L3 has a positive refractive power as a whole and corresponds to the above-described first lens group. The lens group composed of lenses L4 to L7 has a negative refractive power as a whole and corresponds to the above-described second lens group. The lens group composed of lenses L8 to L13 has a positive refractive power as a whole and corresponds to the above-described intermediate lens group M1. Further, L8 and L9 correspond to the above-described group A, L10 and L11 correspond to the above-described group B, and L12 and L13 correspond to the above-described group C. The lens group composed of lenses L14 to L16 has a positive refractive power as a whole and corresponds to the above-described intermediate lens group M2. The lens group composed of lens L17 has a negative refractive power as a whole and corresponds to the above-described lens group F. The lens group composed of lenses L18 to L20 has a negative refractive power as a whole and corresponds to the above-described lens group L.

[0138] The main body 2 has a CCD sensor I as an imaging element and a cover glass CG. The CCD sensor I is disposed at a position in the main body 2 where the optical axis OA of the zoom lens in the lens barrel 3 attached to the main body 2 is the central axis. The main body 2 may have a parallel flat plate having substantially no refractive power, such as an infrared cut filter (IRCF), instead of the cover glass CG.

[0139] Since the mirrorless single-lens camera 1 includes a zoom lens, high optical performance and downsizing of the product can be achieved simultaneously.

[0140] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention.

[0141] (Summary) The zoom lens according to Embodiment 1 of the present invention is a zoom lens having a plurality of lens groups, which, in order from the object side, include a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a rear group that is a set of lens groups and has a positive refractive power as a whole. The rear group includes, in order from the object side, an intermediate lens group M1 having a positive refractive power and an intermediate lens group M2 having a positive refractive power. When zooming from the wide-angle end to the telephoto end, the interval between adjacent lens groups is configured to change. The intermediate lens group M1 includes, in order from the object side, a set of lenses, a group A having a positive refractive power, a set of lenses, a group B having a negative refractive power, and a set of lenses, a group C having a positive refractive power, and further satisfies the following Condition A or Condition B. (Condition A) At least one lens included in either the intermediate lens group M1 or the intermediate lens group M2 is an anti-vibration lens that moves in a direction intersecting the optical axis of the zoom lens (for example, a direction perpendicular to the optical axis). And when the lens group closest to the image plane side among the rear groups is defined as the lens group L, the following formulas (1) and (2) are satisfied. -1000 < βm1w < 0.00 ··· (1) -5.00 < mL / fw < -0.01 ··· (2) However, βm1w: Lateral magnification of the intermediate lens group M1 at infinity focus at the wide-angle end mL: Movement distance of the lens group L during zooming from the wide-angle end to the telephoto end when the movement distance from the object side to the image plane side is positive fw: Focal length of the zoom lens at the wide-angle end (Condition B) At least one lens included in the intermediate lens group M1 and the lens group on the image plane side of the intermediate lens group M1 is an anti-vibration lens that moves in a direction intersecting the optical axis of the zoom lens. And the following formulas (3) and (4) are satisfied. 0.20 < Lt / ft < 1.30 ··· (3) 0.10 < fC / fM1 < 9.50 ··· (4) However, Lt: Total length of the zoom lens at the telephoto end ft: Focal length of the zoom lens at the telephoto end fC: Focal length of the C group fM1: Focal length of the intermediate lens group M1

[0142] The zoom lens according to Embodiment 2 of the present invention further satisfies the following formula (5) under Condition A of Embodiment 1. 0.10 < Lt / ft < 3.00 ··· (5) However, Lt: Total length of the zoom lens at the telephoto end ft: Focal length of the zoom lens at the telephoto end

[0143] The zoom lens according to Embodiment 3 of the present invention further satisfies the following formula (6) under Condition A in Embodiment 1 or Embodiment 2. 0.10 < fC / fM1 < 20.00 ··· (6) However, fC: Focal length of the C group fM1: Focal length of the intermediate lens group M1

[0144] The zoom lens according to Embodiment 4 of the present invention further satisfies the following formula (7) under Condition B of Embodiment 1. -1000 < βm1w < 0.00 ··· (7) However, βm1w: Lateral magnification of the intermediate lens group M1 at infinity focus at the wide-angle end

[0145] When the lens group closest to the image plane under Condition B in the zoom lens according to Embodiment 5 of the present invention is the lens group L in Embodiment 1 or Embodiment 4, the following formula (8) is satisfied. -5.00 < mL / fw < -0.01 ··· (8) However, mL: Moving distance of the lens group L during variable magnification from the wide-angle end to the telephoto end, with the moving distance from the object side to the image plane side being positive fw: Focal length of the zoom lens at the wide-angle end

[0146] The zoom lens according to Aspect 6 of the present invention satisfies the following formula (9) in any one of Aspects 1 to 5. 0.10 < f1 / fw < 10.00 ··· (9) However, f1: Focal length of the first lens group fw: Focal length of the zoom lens at the wide-angle end

[0147] The zoom lens according to Aspect 7 of the present invention satisfies the following formula (10) in any one of Aspects 1 to 6. 0.90 < βm1t / βm1w < 10.00 ··· (10) However, βm1w: Lateral magnification of the intermediate lens group M1 at infinity focus at the wide-angle end βm1t: Lateral magnification of the intermediate lens group M1 at infinity focus at the telephoto end

[0148] The zoom lens according to Aspect 8 of the present invention, in any one of Aspects 1 to 7, the C group is an anti-shake lens.

[0149] The zoom lens according to Aspect 9 of the present invention satisfies the following formula (11) in Aspect 8. 0.50 < (1 - βct) × βcrt < 6.00 ··· (11) However, βct: Lateral magnification of the C group at infinity focus at the telephoto end βcrt: Combined lateral magnification of the lens group on the image plane side of the C group at infinity focus at the telephoto end

[0150] The zoom lens according to Aspect 10 of the present invention, in Aspect 8 or Aspect 9, the C group has a convex lens and satisfies the following formula (12). 1.40 < Ndp < 1.75 ··· (12) However, Ndp: Refractive index of the convex lens of the C group with respect to the d line

[0151] The zoom lens according to Aspect 11 of the present invention, in any one of Aspects 1 to 10, the C group has a convex lens and satisfies the following formula (13). 50 < νdp < 100 ··· (13) However, νdp: Abbe number of the convex lens of group C

[0152] In the zoom lens according to aspect 12 of the present invention, in any of aspects 1 to 11, group C has a concave lens.

[0153] In the zoom lens according to aspect 13 of the present invention, in any of aspects 1 to 12, group B has a convex lens.

[0154] In the zoom lens according to aspect 14 of the present invention, in any of aspects 1 to 13, the following formula (14) is satisfied. -20.00 < fB / fM1 < -0.10 ··· (14) However, fB: Focal length of group B fM1: Focal length of the intermediate lens group M1

[0155] In the zoom lens according to aspect 15 of the present invention, in any of aspects 1 to 14, group B has a concave lens and satisfies the following formula (15). 1.70 < Ndn < 2.20 ··· (15) However, Ndn: Refractive index with respect to the d line of the concave lens of group B

[0156] In the zoom lens according to aspect 16 of the present invention, in any of aspects 1 to 15, the following formula (16) is satisfied. 0.50 < Xm1 / Xm2 < 2.00 ··· (16) However, Xm1: Moving distance of the intermediate lens group M1 during zooming from the wide-angle end to the telephoto end Xm2: Moving distance of the intermediate lens group M2 during zooming from the wide-angle end to the telephoto end

[0157] In the zoom lens according to aspect 17 of the present invention, in any of aspects 1 to 16, the following formula (17) is satisfied. 1.00 < β2t / β2w < 10.00 ··· (17) However, β2w: Lateral magnification of the second lens group at infinity focus at the wide-angle end β2t: Lateral magnification of the second lens group at infinity focus at the telephoto end

[0158] When the lens group closest to the image plane is defined as lens group L in any of Aspects 1 to 17, the zoom lens according to Aspect 18 of the present invention satisfies the following formula (18). 1.10 < βLt / βLw < 3.00 ··· (18) However, βLw: Lateral magnification of lens group L at infinity focus at the wide-angle end βLt: Lateral magnification of lens group L at infinity focus at the telephoto end

[0159] When the entire lens on the image plane side of the intermediate lens group M2 is defined as group R in any of Aspects 1 to 18, the zoom lens according to Aspect 19 of the present invention satisfies the following formula (19). 1.50 < βRt / βRw < 5.00 ··· (19) However, βRw: Lateral magnification of group R at infinity focus at the wide-angle end βRt: Lateral magnification of group R at infinity focus at the telephoto end

[0160] When the lens group adjacent to the image plane side of the intermediate lens group M2 is defined as lens group F in any of Aspects 1 to 19, the zoom lens according to Aspect 20 of the present invention is focused by the movement of lens group F.

[0161] In Aspect 21 of the present invention, in Aspect 20, lens group F has a negative refractive power as a whole.

[0162] When the zoom lens according to Aspect 22 of the present invention is in Aspect 20 or Aspect 21, it satisfies the following formula (20). -20.00 < (1 - βft) 2 ×βfrt 2 < -1.00 ··· (20) However, βft: Lateral magnification of group F at infinity focus at the telephoto end βfrt: The combined transverse magnification of the lens groups on the image plane side compared to the F group at infinity focus at the telephoto end

[0163] In the zoom lens according to Embodiment 23 of the present invention, in any one of Embodiments 20 to 22, the lens group F is composed of a single lens.

[0164] The imaging device according to Embodiment 24 of the present invention includes any one of the zoom lenses of Embodiments 1 to 23, and an imaging element that converts the optical image formed by the zoom lens into an electrical signal on the image plane side of the zoom lens.

[0165] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention.

Example

[0166] An example of the present invention will be described below. In the following tables, unless otherwise specified, all units of length are "mm", all units of the angle of view are "°", and "E+a" means "×10 a ".

[0167] [Example 1] (1) Configuration of the optical system FIG. 1 is a diagram schematically showing the optical configuration at the telephoto end of the zoom lens of Example 1. The zoom lens of Example 1 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an intermediate lens group M1 having a positive refractive power, an intermediate lens group M2 having a positive refractive power, a lens group F having a negative refractive power, and a lens group L having a negative refractive power. The intermediate lens group M1 includes, in order from the object side, a group A having a positive refractive power, a group B having a negative refractive power, and a group C having a positive refractive power. The intermediate lens group M1, the intermediate lens group M2, the lens group F, and the lens group L correspond to the aforementioned rear group. The lens group F and the lens group L correspond to the aforementioned R group.

[0168] The zoom lens focuses from an infinite object to a close object by moving the lens group F toward the object side.

[0169] In Embodiment 1, the zoom lens performs zooming by changing the air interval on the optical axis between adjacent lens groups. The same applies to the following embodiments.

[0170] The arrows in FIG. 1 indicate the moving directions and moving patterns of the respective lens groups during zooming from the wide-angle end to the telephoto end. As shown in FIG. 1, during zooming from the wide-angle end to the telephoto end, the first lens group G1 gradually moves toward the object side, the second lens group G2 does not move first or moves toward the image side and then toward the object side, the intermediate lens group M1 gradually moves toward the object side, the intermediate lens group M2 gradually moves toward the object side, the lens group F moves toward the object side more slowly first and then faster, and the lens group L gradually moves toward the object side.

[0171] The aperture stop S is disposed adjacent to the object side of the intermediate lens group M1. Also, "I" shown in FIG. 1 is the image plane, which is, for example, the imaging plane of a solid-state imaging device such as a CCD sensor and a CMOS sensor, or the film surface of a silver halide film. Further, a cover glass CG is disposed between the lens group L and the CCD sensor I. Since these points are the same in the diagrams schematically showing the optical configurations shown in other embodiments, the description will be omitted below.

[0172] Hereinafter, the configurations of the respective lens groups will be described. The first lens group G1 is composed of, in order from the object side, a cemented lens of a negative meniscus lens L1 with a convex surface facing the object side and a biconvex lens L2, and a positive meniscus lens L3 with a convex surface facing the object side.

[0173] The second lens group G2 is composed of, in order from the object side, a fourth lens L4 having a negative meniscus shape with a convex surface facing the object side, a cemented lens of a fifth lens L5 which is a biconcave lens and a sixth lens L6 which is a biconvex lens, and a seventh lens L7 having a negative meniscus shape with a concave surface facing the object side. Note that a negative meniscus lens is a lens having a negative refractive power, and a positive meniscus lens is a lens having a positive refractive power.

[0174] The intermediate lens group M1 is composed of, in order from the object side, an eighth lens L8 which is a biconvex lens, a ninth lens L9 which is a biconvex lens, a cemented lens of a tenth lens L10 which is a biconvex lens and an eleventh lens L11 which is a biconcave lens, and a cemented lens of a twelfth lens L12 having a negative meniscus shape with a convex surface facing the object side and a thirteenth lens L13 which is a biconvex lens.

[0175] The intermediate lens group M2 is composed of, in order from the object side, a fourteenth lens L14 which is a biconvex lens, a fifteenth lens L15 which is a biconcave lens, and a sixteenth lens L16 which is a biconvex lens.

[0176] The lens group F is composed of a seventeenth lens L17 having a positive meniscus shape with a convex surface facing the object side.

[0177] The lens group L is composed of, in order from the object side, a cemented lens of an eighteenth lens L18 having a positive meniscus shape with a concave surface facing the object side and a nineteenth lens L19 having a negative meniscus shape with a concave surface facing the object side, and a twentieth lens L20 having a negative meniscus shape with a concave surface facing the object side.

[0178] (2) Numerical Examples Next, numerical examples applying specific numerical values of the zoom lens will be described. Table 1 shows the surface data of the zoom lens.

[0179] In the table of surface data in the embodiments of the present invention, "No." represents the order of the lens surfaces counted from the object side, "R" represents the radius of curvature of the lens surface, "D" represents the interval on the optical axis of the lens surface, "Nd" represents the refractive index with respect to the d-line (wavelength λ = 587.56 nm), and "νd" represents the Abbe number with respect to the d-line (wavelength λ = 587.56 nm). Also, "STOP" displayed in the column next to the surface number represents that it is the aperture stop S. Further, "ASPH" displayed in the column next to the surface number represents that the lens surface is an aspherical surface. At this time, the paraxial radius of curvature is shown in the column of the radius of curvature R. Furthermore, the display of "variable" in the column of "D" means that the interval on the optical axis of the lens surface is a variable interval that changes during zooming.

[0180] In Table 1, No. 1 to 5 are the surface numbers of the first lens group G1. No. 6 to 12 are the surface numbers of the second lens group G2. No. 13 is the surface number of the aperture stop S. No. 14 to 23 are the surface numbers of the intermediate lens group M1. No. 24 to 29 are the surface numbers of the intermediate lens group M2. No. 30 to 31 are the surface numbers of the lens group F. No. 32 to No. 36 are the surface numbers of the lens group L. No. 37 and No. 38 are the surface numbers of the cover glass.

[0181] [Table 1] Surface data No. R D Nd Vd 1 108.356 1.200 1.870700 40.730 2 59.577 7.014 1.437000 95.100 3 -1123.684 0.200 4 57.808 6.162 1.497000 81.610 5 860.818 variable 6 143.279 1.000 1.870700 40.730 7 16.910 5.527 8 -1188.523 0.810 1.744000 44.720 9 14.619 8.006 1.770470 29.740 10 -51.218 2.345 11 ASPH -22.579 1.000 1.618810 63.850 12 ASPH -120.804 Variable 13 STOP INF 1.500 14 34.319 2.816 1.854510 25.150 15 -818.123 1.011 16 66.784 4.561 1.516800 64.200 17 -220.158 0.254 18 39.827 3.571 1.497000 81.610 19 -31.396 0.800 2.001000 29.130 20 33.554 1.987 21 24.476 0.800 1.834810 42.720 22 15.315 4.300 1.516330 64.060 23 ASPH -78.619 Variable 24 ASPH 58.886 2.929 1.618810 63.850 25 ASPH -33.653 0.700 26 -45.908 0.800 2.001000 29.130 27 53.654 0.744 28 45.214 3.637 1.720470 34.710 29 -31.465 Variable 30 48.763 0.800 1.755000 52.320 31 22.441 Variable 32 -151.448 4.524 1.854510 25.150 33 -22.480 0.800 1.729160 54.670 34 -430.647 4.404 35 -27.393 1.000 1.729160 54.670 36 -103.271 Variable 37 INF 2.500 1.516800 64.200 38 INF 1.000

[0182] Table 2 shows the specifications of the zoom lens of Example 1. In the said specifications, "f" is the focal length of the zoom lens, "Fno" is the F-number, "ω" is the semi-field angle, and notations such as "D(5)" represent the changing intervals among the lens intervals respectively.

[0183] [Table 2] Wide-angle Intermediate Telephoto f 28.826 91.616 291.040 Fno 3.956 6.481 7.300 ω 38.281 12.679 4.056 D(5) 1.000 26.471 64.763 D(12) 26.604 7.182 1.500 D(23) 5.465 3.155 3.682 D(29) 2.007 9.382 2.011 D(31) 14.707 7.333 14.704 D(36) 13.480 39.911 51.627

[0184] Table 3 shows the aspherical coefficients of the aspherical surfaces in the zoom lens of Example 1. The aspherical coefficients in the said table are the values when each aspherical shape is defined by the following formula (I).

[0185]

Equation

[0186] In the said formula, "X(Y)" is a function indicating the displacement amount of the aspherical surface in the optical axis direction from a reference plane perpendicular to the optical axis, "C" is the curvature at the vertex of the surface, "Y" is the height (distance) from the optical axis to the aspherical surface in the direction perpendicular to the optical axis, "k" is the conic constant (conic coefficient), and "An" (n is an integer) is the aspherical coefficient of the n-th order.

[0187] [Table 3] Aspherical data No. K A4 A6 11 0.00 -1.912570E-05 3.574780E-07 12 0.00 -3.386900E-05 3.166070E-07 23 0.00 3.581830E-06 5.311830E-09 24 0.00 -1.251230E-05 -7.995040E-08 25 0.00 6.779470E-06 -9.976160E-08 No. A8 A10 A12 11 -4.507780E-09 3.038130E-11 -8.606390E-14 12 -3.774900E-09 2.348260E-11 -5.995090E-14 23 -4.028280E-10 -7.314920E-13 1.788380E-14 24 1.392650E-09 -1.761440E-11 1.582530E-14 25 1.672330E-09 -1.935610E-11 1.865960E-14

[0188] Figure 2 shows the longitudinal aberration diagram at INF focusing when zooming from the wide-angle end to the telephoto end of the optical system. Each longitudinal aberration diagram represents spherical aberration, astigmatism, and distortion in order from the left. Also, Z1 represents the longitudinal aberration diagram at the wide-angle end, Z2 represents the longitudinal aberration diagram at the intermediate position, and Z3 represents the longitudinal aberration diagram at the telephoto end, respectively.

[0189] In the diagram representing spherical aberration, the vertical axis is the ratio of the ray height to the entrance pupil, and the horizontal axis is defocus. In the diagram showing spherical aberration, the solid line represents the d-line (587.6 nm), and the dashed line represents the g-line (435.8 nm).

[0190] In the figure representing the aberration of coma, the vertical axis represents the angle of view and the horizontal axis represents defocus. In the figure showing the aberration of coma, the solid line represents the sagittal direction S of the d-line, and the dashed line represents the meridional direction T of the d-line.

[0191] In the figure representing the distortion aberration, the vertical axis represents the angle of view and the horizontal axis represents %. In the figure showing the distortion aberration, the solid line represents the distortion aberration of the d-line. Note that the order of displaying these aberrations, the arrangement, and what the solid line, wavy line, etc. represent in each figure are the same in Examples 2 to 6, so the description will be omitted below.

[0192] [Example 2] (1) Configuration of the optical system Figure 3 is a diagram schematically showing the optical configuration at the telephoto end of the zoom lens of Example 2. The zoom lens of Example 2 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a negative refractive power, an intermediate lens group M1 having a positive refractive power, an intermediate lens group M2 having a positive refractive power, a lens group F having a negative refractive power, and a lens group L having a negative refractive power. The intermediate lens group M1 includes, in order from the object side, a group A having a positive refractive power, a group B having a negative refractive power, and a group C having a positive refractive power. The intermediate lens group M1, the intermediate lens group M2, the lens group F, and the lens group L correspond to the aforementioned rear group. The lens group F and the lens group L correspond to the aforementioned R group.

[0193] The zoom lens focuses from an infinite object to a close object by moving the lens group F toward the object side.

[0194] The arrows in Fig. 3 indicate the moving directions and moving patterns of each lens group during the zooming from the wide-angle end to the telephoto end. As shown in Fig. 3, during the zooming from the wide-angle end to the telephoto end, the first lens group G1 gradually moves toward the object side, the second lens group G2 first does not move or moves toward the image plane side and then moves toward the object side, the third lens group G3 first moves more slowly and then more quickly toward the object side, the intermediate lens group M1 gradually moves toward the object side, the intermediate lens group M2 gradually moves toward the object side, the lens group F first moves more slowly and then more quickly toward the object side, and the lens group L gradually moves toward the object side.

[0195] Hereinafter, the configurations of each lens group will be described. The first lens group G1 is composed of, in order from the object side, a cemented lens of a negative meniscus lens L1 with a convex surface facing the object side and a biconvex lens L2, and a positive meniscus lens L3 with a convex surface facing the object side.

[0196] The second lens group G2 is composed of, in order from the object side, a negative meniscus lens L4 with a convex surface facing the object side, and a cemented lens of a cemented lens of a negative meniscus lens L5 with a convex surface facing the object side and a biconvex lens L6.

[0197] The third lens group G3 is composed of a negative meniscus lens L7 with a concave surface facing the object side.

[0198] The intermediate lens group M1 is composed of, in order from the object side, a positive meniscus lens L8 with a convex surface facing the object side, a cemented lens of a biconvex lens L9, a biconcave lens L10, and a positive meniscus lens L11 with a convex surface facing the object side, and a cemented lens of a negative meniscus lens L12 with a convex surface facing the object side and a biconvex lens L13.

[0199] The intermediate lens group M2 is composed of, in order from the object side, a biconvex lens L14, and a cemented lens of a biconcave lens L15 and a biconvex lens L16.

[0200] The lens group F is composed of a negative meniscus lens L17 with a convex surface facing the object side.

[0201] The lens group L is composed of, in order from the object side, a cemented lens of a positive meniscus lens L18 with a concave surface facing the object side and a biconcave lens L19, and a negative meniscus lens L20 with a concave surface facing the object side.

[0202] (2) Numerical Examples Table 4 shows the surface data of the zoom lens.

[0203] [Table 4] Surface Data No. R D Nd Vd 1 111.112 0.800 1.910820 35.250 2 71.088 7.032 1.437000 95.100 3 -643.286 0.200 4 65.679 6.579 1.437000 95.100 5 2188.473 Variable 6 299.301 1.000 1.804200 46.500 7 27.199 2.782 8 80.412 0.800 1.804200 46.500 9 16.961 8.074 1.770470 29.740 10 -1053.348 Variable 11 -29.452 0.800 1.618000 63.390 12 ASPH -402.633 Variable 13 STOP INF 0.200 14 34.410 3.977 1.921190 23.960 15 216.742 0.200 16 31.728 5.490 1.516800 64.200 17 -89.103 0.800 2.001000 29.130 18 23.286 4.633 1.516800 64.200 19 187.606 0.200 20 33.200 0.800 1.870700 40.730 21 22.135 5.684 1.516330 64.060 22 ASPH -147.890 Variable 23 ASPH 57.367 7.065 1.618810 63.850 24 ASPH -34.920 0.700 25 -40.685 0.800 2.001000 29.130 26 55.601 8.122 1.672700 32.170 27 -30.562 Variable 28 42.904 0.800 1.497000 81.610 29 21.883 Variable 30 -195.786 4.088 1.854780 24.800 31 -22.937 0.800 1.729160 54.670 32 81.382 4.143 33 -22.431 0.800 1.729160 54.670 34 -53.956 Variable 35 INF 2.500 1.516800 64.200 36 INF 1.000

[0204] Table 5 shows the specifications of the zoom lens of Example 2.

[0205] [Table 5] Specification values Wide angle Medium Telephoto f 41.208 126.410 388.127 Fno 4.100 6.500 7.300 ω 27.966 9.250 3.101 D(5) 1.000 30.210 55.215 D(10) 11.626 7.360 6.812 D(12) 28.769 12.583 1.000 D(22) 2.000 2.418 2.000 D(27) 1.996 6.511 1.997 D(29) 15.241 10.726 15.240 D(34) 13.479 35.398 66.879

[0206] Table 6 shows the aspherical coefficients of the aspherical surfaces in the zoom lens of Example 2.

[0207] [Table 6] Aspherical Data No. K A4 A6 12 0.00 -7.773920E-06 -2.666640E-09 22 0.00 2.104600E-06 -3.440740E-09 23 0.00 -1.754630E-05 -4.190830E-08 24 0.00 4.543850E-07 -3.311770E-08 No. A8 A10 A12 12 3.201870E-11 -2.383810E-13 5.835560E-16 22 2.856760E-11 -2.702400E-13 7.356970E-16 23 2.626230E-11 -1.078860E-12 1.200970E-15 25 -5.212780E-11 -4.474700E-13 6.522490E-16

[0208] [Example 3] (1) Configuration of the optical system FIG. 5 is a diagram schematically showing the optical configuration at the telephoto end of the zoom lens of Example 3. The zoom lens of Example 3 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an intermediate lens group M1 having a positive refractive power, an intermediate lens group M2 having a positive refractive power, a lens group F having a negative refractive power, and a lens group L having a negative refractive power. The intermediate lens group M1 includes, in order from the object side, a group A having a positive refractive power, a group B having a negative refractive power, and a group C having a positive refractive power. The intermediate lens group M1, the intermediate lens group M2, the lens group F, and the lens group L correspond to the aforementioned rear group. The lens group F and the lens group L correspond to the aforementioned R group.

[0209] The zoom lens focuses from an infinite object to a close object by moving the lens group F toward the object side.

[0210] The arrows in FIG. 5 indicate the moving directions and moving patterns of the respective lens groups during zooming from the wide-angle end to the telephoto end. As shown in FIG. 5, during zooming from the wide-angle end to the telephoto end, the first lens group G1 gradually moves toward the object side, the second lens group G2 first does not move or moves toward the image plane side and then moves toward the object side, the intermediate lens group M1 gradually moves toward the object side, the intermediate lens group M2 gradually moves toward the object side, the lens group F first moves more slowly and then more quickly toward the object side, and the lens group L gradually moves toward the object side.

[0211] Hereinafter, the configurations of the respective lens groups will be described. The first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L1 with its convex surface facing the object side and a biconvex lens L2, and a positive meniscus lens L3 with its convex surface facing the object side.

[0212] The second lens group G2 includes, in order from the object side, a negative meniscus lens L4 with its convex surface facing the object side, a biconcave lens L5, a biconvex lens L6, and a negative meniscus lens L7 with its concave surface facing the object side.

[0213] The intermediate lens group M1 is composed of, in order from the object side, a biconvex lens L8, a cemented lens of a biconcave lens L9 and a biconvex lens L10, and a cemented lens of a negative meniscus lens L11 with its convex surface facing the object side and a biconvex lens L12.

[0214] The intermediate lens group M2 is composed of, in order from the object side, a biconvex lens L13 and a cemented lens of a biconcave lens L14 and a biconvex lens L15.

[0215] The lens group F is composed of a concave meniscus lens L16 with its convex surface facing the object side.

[0216] The lens group L is composed of, in order from the object side, a cemented lens of a biconvex lens L17 and a negative meniscus lens L18 with its concave surface facing the object side, and a biconcave lens L19.

[0217] (2) Numerical Examples Table 7 shows the surface data of the zoom lens.

[0218] [Table 7] Surface Data No. R D Nd Vd 1 106.581 1.200 1.870700 40.730 2 61.356 7.164 1.437000 95.100 3 -427.231 0.200 4 55.554 5.832 1.497000 81.610 5 317.904 Variable 6 ASPH 76.902 0.800 1.953750 32.320 7 14.164 6.732 8 -24.384 0.800 1.729160 54.670 9 101.357 1.272 10 42.045 4.139 1.854510 25.150 11 -30.861 1.846 12 -18.739 1.001 1.834810 42.720 13 -32.055 Variable 14 STOP INF 1.500 15 46.441 3.180 1.854780 24.800 16 -41.785 2.749 17 -27.743 0.800 2.001000 29.130 18 43.710 2.628 1.618000 63.390 19 -83.754 0.500 20 27.648 0.815 1.903660 31.310 21 17.439 4.000 1.516800 64.200 22 ASPH -69.461 Variable 23 ASPH 30.394 3.802 1.618810 63.850 24 ASPH -26.077 0.701 25 -129.970 0.800 2.001000 29.130 26 17.152 3.544 1.688930 31.160 27 -110.472 Variable 28 92.986 0.800 1.729160 54.670 29 26.257 Variable 30 98.725 5.740 1.647690 33.840 31 -13.235 0.800 1.804200 46.500 32 -22.505 1.503 33 -29.398 1.000 1.804200 46.500 34 55.482 Variable 35 INF 2.500 1.516800 64.200 36 INF 1.000

[0219] Table 8 shows the specifications of the zoom lens of Example 3.

[0220] [Table 8] Specification values Wide angle, medium, telephoto f 18.543 73.437 290.998 Fno 3.481 5.656 8.212 ω 38.938 10.450 2.731 D(5) 1.000 35.427 66.530 D(13) 35.853 7.808 1.500 D(22) 8.034 4.422 2.634 D(27) 3.989 10.939 1.001 D(29) 10.278 3.328 13.266 D(34) 13.500 34.324 67.731

[0221] Table 9 shows the aspherical coefficients of the aspherical surfaces in the zoom lens of Example 3.

[0222] [Table 9] Aspherical data No. K A4 A6 6 0.00 6.741350E-06 9.342860E-09 22 0.00 3.133110E-06 -6.069810E-10 23 0.00 -3.153600E-06 2.659370E-10 24 0.00 2.891270E-05 -2.032010E-08 No. A8 A10 A12 6 -9.966290E-11 3.807520E-13 2.437220E-16 22 -3.399520E-10 5.643530E-12 -3.536760E-14 23 4.639900E-10 -3.663480E-12 3.735970E-1 24 1.469060E-10 -3.690610E-13 2.303290E-14

[0223] [Example 4] (1) Configuration of the optical system FIG. 7 is a diagram schematically showing the optical configuration at the telephoto end of the zoom lens of Example 4. The zoom lens of Example 4 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an intermediate lens group M1 having a positive refractive power, an intermediate lens group M2 having a positive refractive power, a lens group F having a negative refractive power, a third lens group G3 having a positive refractive power, and a lens group L having a negative refractive power. The intermediate lens group M1 includes, in order from the object side, a group A having a positive refractive power, a group B having a negative refractive power, and a group C having a positive refractive power. The intermediate lens group M1, the intermediate lens group M2, the lens group F, the third lens group G3, and the lens group L correspond to the aforementioned rear group. The lens group F, the third lens group G3, and the lens group L correspond to the aforementioned R group.

[0224] The zoom lens focuses from an infinite object to a close object by moving the lens group F toward the object side.

[0225] The arrows in FIG. 7 indicate the moving directions and moving patterns of the respective lens groups during zooming from the wide-angle end to the telephoto end. As shown in FIG. 3, during zooming from the wide-angle end to the telephoto end, the first lens group G1 gradually moves toward the object side, the second lens group G2 first does not move or moves toward the image plane side and then moves toward the object side, the intermediate lens group M1 gradually moves toward the object side, the intermediate lens group M2 gradually moves toward the object side, the lens group F moves toward the object side more slowly at first and then more quickly, the third lens group G3 gradually moves toward the object side, and the lens group L gradually moves toward the object side.

[0226] The configuration of each lens group will be described below. The first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L1 with its convex surface facing the object side and a biconvex lens L2, and a positive meniscus lens L3 with its convex surface facing the object side.

[0227] The second lens group G2 is composed of, in order from the object side, a negative meniscus lens L4 with a convex surface facing the object side, a biconcave lens L5, a biconvex lens L6, and a biconcave lens L7.

[0228] The intermediate lens group M1 is composed of, in order from the object side, a biconvex lens L8, a cemented lens of a biconvex lens L9 and a biconcave lens L10, and a cemented lens of a positive meniscus lens L11 with a convex surface facing the object side and a biconvex lens L12.

[0229] The intermediate lens group M2 is composed of, in order from the object side, a biconvex lens L13 and a cemented lens of a biconcave lens L14 and a biconvex lens L15.

[0230] The lens group F is composed of a negative meniscus lens L16 with a convex surface facing the object side.

[0231] The third lens group G3 is composed of a cemented lens of a biconcave lens L17 and a biconvex lens L18.

[0232] The lens group L is composed of, in order from the object side, a negative meniscus lens L19 with a convex surface facing the object side.

[0233] (2) Numerical Examples Table 10 shows the surface data of the zoom lens.

[0234] [Table 10] Surface Data No. R D Nd Vd 1 123.084 1.200 1.870700 40.730 2 62.860 8.867 1.437000 95.100 3 -1888.659 0.200 4 62.147 8.650 1.497000 81.610 5 2547.487 Variable 6 27.364 0.800 1.834810 42.720 7 16.044 4.650 8 -48.004 0.800 1.729160 54.670 9 94.714 0.202 10 25.688 3.423 1.854510 25.150 11 -380.211 5.641 12 -30.830 1.000 1.804200 46.500 13 147.357 Variable 14 STOP INF 1.500 15 66.258 2.168 1.806100 40.730 16 -357.546 0.201 17 83.859 3.529 1.698950 30.050 18 -26.655 0.800 2.001000 29.130 19 290.007 0.506 20 39.524 1.000 1.870700 40.730 21 23.677 4.000 1.497000 81.610 22 -84.948 Variable 23 ASPH 39.371 3.298 1.592010 67.020 24 ASPH -33.102 0.700 25 -72.900 0.800 2.001000 29.130 26 40.966 2.746 1.620040 36.300 27 -54.850 Variable 28 60.904 0.800 1.592820 68.620 29 22.079 Variable 30 -76.129 0.800 1.729160 54.670 31 19.496 4.783 1.672700 32.170 32 -28.648 Variable 33 -28.495 0.800 1.870700 40.730 34 - 4654.016 Variable 35 INF 2.500 1.516800 64.200 36 INF 1.000

[0235] Table 11 shows the specifications of the zoom lens of Example 4.

[0236] [Table 11] Specification values Wide - angle Medium Telephoto f 41.248 141.384 485.008 Fno 4.605 6.501 8.200 ω 18.966 5.541 1.640 D(5) 1.000 49.824 73.207 D(13) 29.346 13.490 1.500 D(22) 10.948 2.480 10.510 D(27) 12.626 14.231 1.128 D(29) 7.978 6.373 19.476 D(32) 7.248 6.348 3.038 D(34) 13.492 26.390 53.786

[0237] Table 12 shows the aspherical coefficients of the aspherical surfaces in the zoom lens of Example 4.

[0238] [Table 12] Aspherical data No. K A4 A6 23 0.00 - 3.524240E - 06 - 3.640660E - 08 24 0.00 1.267780E - 05 - 1.019830E - 08 No. A8 A10 A12 23 2.396240E - 09 - 4.052570E - 11 2.852050E - 13 24 1.405120E - 09 - 2.905700E - 11 2.375070E - 13

[0239] [Example 5] (1) Configuration of the optical system FIG. 9 is a diagram schematically showing the optical configuration at the telephoto end of the zoom lens according to Example 5. The zoom lens according to Example 5 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an intermediate lens group M1 having a positive refractive power, an intermediate lens group M2 having a positive refractive power, a lens group F having a negative refractive power, a third lens group G3 having a positive refractive power, and a lens group L having a negative refractive power. The intermediate lens group M1 includes, in order from the object side, a group A having a positive refractive power, a group B having a negative refractive power, and a group C having a positive refractive power. The intermediate lens group M1, the intermediate lens group M2, the lens group F, the third lens group G3, and the lens group L correspond to the aforementioned rear group. The lens group F, the third lens group G3, and the lens group L correspond to the aforementioned R group.

[0240] The zoom lens focuses from an infinite object to a close object by moving the lens group F toward the object side.

[0241] The arrows in FIG. 9 indicate the moving directions and moving patterns of the respective lens groups during zooming from the wide-angle end to the telephoto end. As shown in FIG. 9, during zooming from the wide-angle end to the telephoto end, the first lens group G1 gradually moves toward the object side, the second lens group G2 does not move first or moves toward the image side and then toward the object side, the intermediate lens group M1 gradually moves toward the object side, the intermediate lens group M2 gradually moves toward the object side, the lens group F moves toward the object side first more slowly and then more quickly, the third lens group G3 gradually moves toward the object side, and the lens group L gradually moves toward the object side.

[0242] The configuration of each lens group will be described below. The first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L1 with a convex surface facing the object side and a biconvex lens L2, and a biconvex lens L3.

[0243] The second lens group G2 includes, in order from the object side, a cemented lens of a biconvex lens L4 and a biconcave lens L5, a biconcave lens L6, and a biconcave lens L7.

[0244] The intermediate lens group M1 is composed of, in order from the object side, a biconvex lens L8, a cemented lens of a biconvex lens L9 and a negative meniscus lens L10 with its concave surface facing the object surface, and a cemented lens of a negative meniscus lens L11 with its convex surface facing the object side and a biconvex lens L12.

[0245] The intermediate lens group M2 is composed of, in order from the object side, a biconvex lens L13 and a cemented lens of a biconcave lens L14 and a biconvex lens L15.

[0246] The lens group F is composed of a negative meniscus lens L16 with its convex surface facing the object side.

[0247] The third lens group G3 is composed of, in order from the object side, a cemented lens of a biconcave lens L17 and a biconvex lens L18.

[0248] The lens group L is composed of a biconcave lens L19.

[0249] (2) Numerical Examples Table 13 shows the surface data of the zoom lens.

[0250] [Table 13] Surface Data No. R D Nd Vd 1 161.851 1.200 1.870700 40.730 2 74.926 10.737 1.437000 95.100 3 -976.687 0.200 4 75.504 10.535 1.497000 81.610 5 -1427.877 Variable 6 60.350 3.937 1.846660 23.780 7 -75.869 0.800 1.592820 68.620 8 48.223 5.494 9 -429.392 0.800 1.870700 40.730 10 67.831 2.545 11 -41.475 1.000 1.953750 32.320 12 213.032 Variable 13 STOP INF 1.500 14 49.394 2.781 1.696800 55.460 15 -196.292 0.200 16 849.274 3.536 1.728250 28.320 17 -26.315 0.800 2.001000 29.130 18 501.040 0.500 19 52.271 0.800 1.804200 46.500 20 28.820 4.000 1.516800 64.200 21 -270.889 Variable 22 ASPH 29.854 4.209 1.618810 63.850 23 ASPH -41.616 0.700 24 -110.467 0.800 1.834810 42.720 25 19.923 4.284 1.517420 52.150 26 -65.228 Variable 27 70.882 0.800 1.729160 54.670 28 28.742 Variable 29 -72.596 0.800 1.729160 54.670 30 20.652 4.707 1.672700 32.170 31 -37.915 Variable 32 -39.396 0.800 1.755000 52.320 33 -5675.591 Variable 34 INF 2.500 1.516800 64.200 35 INF 1.000

[0251] Table 14 shows the specifications of the zoom lens of Example 5.

[0252] [Table 14] Specification values Wide angle Medium Telephoto f 51.518 173.153 582.185 Fno 4.600 6.500 8.200 ω 15.399 4.578 1.376 D(5) 1.000 55.620 82.334 D(12) 35.638 23.564 1.500 D(21) 19.388 2.835 6.054 D(26) 23.346 14.002 0.997 D(28) 6.257 15.601 28.606 D(31) 3.916 6.835 1.000 D(33) 13.488 28.691 62.564

[0253] Table 15 shows the aspherical coefficients of the aspherical surfaces in the zoom lens of Example 5.

[0254] [Table 15] Aspherical data No. K A4 A6 22 0.00 -2.854210E-06 2.612630E-08 23 0.00 8.939510E-06 4.071040E-08 No. A8 A10 A12 22 -7.899660E-11 -2.150510E-12 2.480900E-14 23 -6.187070E-10 3.438190E-12 4.073480E-15

[0255] [Example 6] (1) Configuration of the optical system FIG. 11 is a diagram schematically showing the optical configuration at the telephoto end of the zoom lens according to Embodiment 6. The zoom lens according to Embodiment 6 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an intermediate lens group M1 having a positive refractive power, an intermediate lens group M2 having a positive refractive power, a lens group F having a negative refractive power, a third lens group G3 having a positive refractive power, and a lens group L having a negative refractive power. The intermediate lens group M1 includes, in order from the object side, a group A having a positive refractive power, a group B having a negative refractive power, and a group C having a positive refractive power. The intermediate lens group M1, the intermediate lens group M2, the lens group F, the third lens group G3, and the lens group L correspond to the aforementioned rear group. The lens group F, the third lens group G3, and the lens group L correspond to the aforementioned R group.

[0256] The zoom lens focuses from an infinite object to a close object by moving the lens group F toward the object side.

[0257] The arrows in FIG. 11 indicate the moving directions and moving patterns of the respective lens groups during zooming from the wide-angle end to the telephoto end. As shown in FIG. 11, during zooming from the wide-angle end to the telephoto end, the first lens group G1 gradually moves toward the object side, the second lens group G2 first does not move or moves toward the image plane side and then moves toward the object side, the intermediate lens group M1 gradually moves toward the object side, the intermediate lens group M2 gradually moves toward the object side, the lens group F first moves more slowly and then more quickly toward the object side, the third lens group G3 gradually moves toward the object side, and the lens group L gradually moves toward the object side.

[0258] The configurations of the respective lens groups will be described below. The first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L1 and a biconvex lens L2 with the convex surface facing the object side, and a biconvex lens L3.

[0259] The second lens group G2 includes, in order from the object side, a cemented lens of a positive meniscus lens L4 and a biconcave lens L5 with the convex surface facing the object side, a biconcave lens L6, and a biconcave lens L7.

[0260] The intermediate lens group M1 is composed of, in order from the object side, a biconvex lens L8, a cemented lens of a positive meniscus lens L9 with its concave surface facing the object side and a biconcave lens L10, and a cemented lens of a negative meniscus lens L11 with its convex surface facing the object side and a biconvex lens L12.

[0261] The intermediate lens group M2 is composed of, in order from the object side, a biconvex lens L13 and a cemented lens of a biconcave lens L14 and a biconvex lens L15.

[0262] The lens group F is composed of a negative meniscus lens L16 with its convex surface facing the object side.

[0263] The third lens group G3 is composed of, in order from the object side, a cemented lens of a biconvex lens L17 and a biconcave lens L18, and a cemented lens of a biconcave lens L19 and a biconvex lens L20.

[0264] The lens group L is composed of a negative meniscus lens L21 with its concave surface facing the object plane.

[0265] (2) Numerical examples Table 16 shows the surface data of the zoom lens.

[0266] [Table 16] Surface data No. R D Nd Vd 1 231.295 1.200 1.834810 42.720 2 90.335 9.060 1.437000 95.100 3 -622.345 0.200 4 90.259 8.578 1.497000 81.610 5 -1419.574 Variable 6 78.374 4.344 1.854780 24.800 7 -99.298 2.225 1.497000 81.610 8 51.973 1.866 9 -675.886 0.800 1.834810 42.720 10 86.447 2.798 11 -74.370 1.000 1.870700 40.730 12 84.743 Variable 13 STOP INF 1.500 14 36.938 3.711 1.647690 33.840 15 -408.078 0.765 16 -211.183 3.436 1.854510 25.150 17 -32.221 0.800 2.001000 29.130 18 126.815 0.500 19 60.005 0.800 1.834810 42.720 20 34.897 4.000 1.518230 58.960 21 -512.633 Variable 22 ASPH 27.955 5.452 1.618810 63.850 23 ASPH -52.938 0.703 24 -164.103 0.800 1.953750 32.320 25 24.898 9.899 1.517420 52.150 26 -47.532 Variable 27 161.144 0.814 1.497000 81.610 28 35.526 Variable 29 47.332 4.482 1.647690 33.840 30 -32.337 0.808 2.001000 29.130 31 39.909 4.111 32 -54.011 0.800 1.437000 95.100 33 37.034 6.874 1.717360 29.500 34 -31.012 Variable 35 -34.214 0.800 1.729160 54.670 36 -8790.330 Variable 37 INF 2.500 1.516800 64.200 38 INF 1.000

[0267] Table 17 shows the specifications table of the zoom lens of Example 6.

[0268] [Table 17] Specification values Wide-angle Medium Telephoto f 61.846 189.603 581.950 Fno 4.600 6.500 8.400 ω 18.825 6.199 2.075 D(5) 1.000 58.068 96.164 D(12) 46.502 19.454 1.825 D(21) 14.726 6.970 1.000 D(26) 6.888 12.104 1.002 D(28) 10.543 5.326 16.429 D(34) 25.231 22.979 11.780 D(36) 13.489 30.321 70.200

[0269] Table 18 shows the aspherical coefficients of the aspherical surfaces in the zoom lens of Example 6.

[0270] [Table 18] Aspherical data No. K A4 A6 22 0.00 -5.067390E-06 6.532070E-09 23 0.00 8.552010E-06 9.130610E-09 No. A8 A10 A12 22 -5.488680E-12 -5.452510E-13 2.726130E-15 34 -1.558500E-10 5.085040E-13 2.613270E-16

[0271] The calculated values according to the above formulas in Examples 1 to 6 are shown in Table 19.

[0272] [Table 19] Example 1 Example 2 Example 3 βm1w -1.855 0.267 -1.774 mL / fw -1.323 -1.296 -2.925 Lt / ft 0.746 0.593 0.763 fC / fM1 1.319 1.838 1.380 f1 / fw 3.792 2.817 5.668 βm1t / βm1w 2.244 -0.106 3.407 (1-βct)×βcrt 2.400 2.401 2.400 Ndp 1.516 1.516 1.517 νdp 64.060 64.060 64.200 fB / fM1 -0.816 -2.302 -0.670 Ndn 2.001 2.001 2.001 Xm1 / Xm2 0.953 1.000 0.948 β2t / β2w 4.442 -30.929 5.228 βLt / βLw 1.519 1.973 1.454 βRt / βRw 1.765 2.165 2.066 (1-βft) 2 ×βfrt 2 -9.941 -10.508 -11.000 Example 4 Example 5 Example 6 βm1w -3.179 -125.499 7.188 mL / fw -0.977 -0.953 -0.917 Lt / ft 0.474 0.438 0.490 fC / fM1 1.738 2.757 3.556 f1 / fw 2.956 2.785 2.797 βm1t / βm1w 0.513 0.020 3.267 (1-βct)×βcrt 1.782 1.205 1.170 Ndp 1.497 1.517 1.518 νdp 81.610 64.200 58.960 fB / fM1 -3.397 -1.763 -1.261 Ndn 2.001 2.001 2.001 Xm1 / Xm2 0.758 0.674 0.880 β2t / β2w 7.610 7.975 5.372 βLt / βLw 1.810 1.709 1.889 βRt / βRw 2.037 2.228 1.974 (1-βft) 2 ×βfrt 2 -11.000 -11.008 -10.997

Explanation of Symbols

[0273] 1 Mirrorless Single-lens Camera 2 Body 3 Lens Barrel

Claims

1. A zoom lens having a plurality of lens groups, comprising: a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a rear group which is a set of lens groups and has a positive refractive power as a whole, in order from the object side; the rear group has, in order from the object side, an intermediate lens group M1 having a positive refractive power and an intermediate lens group M2 having a positive refractive power; configured such that the interval between adjacent lens groups changes during zooming from the wide-angle end to the telephoto end; the intermediate lens group M1 has, in order from the object side, a set of lenses, a group A having a positive refractive power, a set of lenses, a group B having a negative refractive power, and a set of lenses, a group C having a positive refractive power; A zoom lens further satisfying the following condition A or condition B. (Condition A) At least one lens included in either the intermediate lens group M1 or the intermediate lens group M2 is an anti-vibration lens that moves in a direction intersecting the optical axis of the zoom lens, and when the lens group closest to the image plane side among the rear groups is defined as lens group L, the following formulas (1) and (2) are satisfied. -1000 < βm1w < 0.00... (1) -5.00 < mL / fw < -0.01... (2) However, βm1w: Lateral magnification of the intermediate lens group M1 at infinity focus at the wide-angle end mL: Moving distance of the lens group L during zooming from the wide-angle end to the telephoto end when the moving distance from the object side to the image plane side is taken as positive fw: Focal length of the zoom lens at the wide-angle end (Condition B) At least one lens included in the intermediate lens group M1 and the lens group on the image plane side of the intermediate lens group M1 is an anti-vibration lens that moves in a direction intersecting the optical axis of the zoom lens, and the following formulas (3) and (4) are satisfied. 0.20 < Lt / ft < 1.30... (3) 0.10 < fC / fM1 < 9.50... (4) However, Lt: Overall length of the zoom lens at the telephoto end ft: Focal length of the zoom lens at the telephoto end fC: Focal length of the group C fM1: Focal length of the intermediate lens group M1

2. The zoom lens according to claim 1, further satisfying the following formula (5) in the condition A. 0.10 < Lt / ft < 3.00... (5) However, Lt: Overall length of the zoom lens at the telephoto end ft: Focal length of the zoom lens at the telephoto end

3. The zoom lens according to claim 1, further satisfying the following formula (6) in the condition A. 0.10 < fC / fM1 < 20.00... (6) However, fC: Focal length of the C group fM1: Focal length of the intermediate lens group M1

4. The zoom lens according to claim 1, further satisfying the following formula (7) under the condition B. -1000 < βm1w < 0.00... (7) However, βm1w: Lateral magnification of the intermediate lens group M1 at infinity focus at the wide-angle end

5. The zoom lens according to claim 1, satisfying the following formula (8) when the lens group closest to the image plane side is the lens group L under the condition B. -5.00 < mL / fw < -0.01... (8) However, mL: Moving distance of the lens group L during variable magnification from the wide-angle end to the telephoto end when the moving distance from the object side to the image plane side is positive fw: Focal length of the zoom lens at the wide-angle end

6. The zoom lens according to claim 1, satisfying the following formula (9). 0.10 < f1 / fw < 10.00... (9) However, f1: Focal length of the first lens group fw: Focal length of the zoom lens at the wide-angle end

7. The zoom lens according to claim 1, satisfying the following formula (10). 0.90 < βm1t / βm1w < 10.00... (10) However, βm1w: Lateral magnification of the intermediate lens group M1 at infinity focus at the wide-angle end βm1t: Lateral magnification of the intermediate lens group M1 at infinity focus at the telephoto end

8. The zoom lens according to claim 1, wherein the C group is the anti-vibration lens.

9. The zoom lens according to claim 8, satisfying the following formula (11). 0.50 < (1 - βct) × βcrt < 6.00... (11) However, βct: Lateral magnification of the C group at infinity focus at the telephoto end βcrt: Combined lateral magnification of the lens group on the image plane side of the C group at infinity focus at the telephoto end

10. The zoom lens according to claim 8, wherein the C group has a convex lens and satisfies the following formula (12). 1.40 < Ndp < 1.75... (12) However, Ndp: Refractive index of the convex lens of the C group with respect to the d line

11. The zoom lens according to claim 1, wherein the C group has a convex lens and satisfies the following formula (13). 50 < νdp < 100... (13) However, νdp: Abbe number of the convex lens of the C group

12. The zoom lens according to claim 1, wherein the C group has a concave lens.

13. The zoom lens according to claim 1, wherein the B group has a convex lens.

14. The zoom lens according to claim 1, which satisfies the following formula (14). -20.00 < fB / fM1 < -0.10... (14) However,[[]] fB: The focal length of the B group fM1: The focal length of the intermediate lens group M1

15. The zoom lens according to claim 1, wherein the B group has a concave lens and satisfies the following formula (15). 1.70 < Ndn < 2.20... (15) However,[[]] Ndn: The refractive index of the concave lens included in the B group with respect to the d line

16. The zoom lens according to claim 1, which satisfies the following formula (16). 0.50 < Xm1 / Xm2 < 2.00... (16) However,[[]] Xm1: The moving distance of the intermediate lens group M1 during zooming from the wide-angle end to the telephoto end Xm2: The moving distance of the intermediate lens group M2 during zooming from the wide-angle end to the telephoto end

17. The zoom lens according to claim 1, which satisfies the following formula (17). 1.00 < β2t / β2w < 10.00... (17) However,[[]] β2w: The lateral magnification of the second lens group at infinity focus at the wide-angle end β2t: The lateral magnification of the second lens group at infinity focus at the telephoto end

18. When the lens group closest to the image plane is the lens group L, the zoom lens according to claim 1, which satisfies the following formula (18). 1.10 < βLt / βLw < 3.00... (18) However,[[]] βLw: The lateral magnification of the lens group L at infinity focus at the wide-angle end βLt: The lateral magnification of the lens group L at infinity focus at the telephoto end

19. When the entire lens on the image plane side of the intermediate lens group M2 is the R group, the zoom lens according to claim 1, which satisfies the following formula (19). 1.50 < βRt / βRw < 5.00... (19) However,[[]] βRw: The lateral magnification of the R group at infinity focus at the wide-angle end βRt: The lateral magnification of the R group at infinity focus at the telephoto end

20. The zoom lens according to claim 1, wherein when the lens group adjacent to the image plane side of the intermediate lens group M2 is the lens group F, focusing is achieved by the movement of the lens group F.

21. The zoom lens according to claim 20, wherein the lens group F has a negative refractive power as a whole.

22. The zoom lens according to claim 20, which satisfies the following formula (20). -20.00 < (1 - βft) ２ ×βfrt ２ < -1.00...(20) However,[[]] βft: The lateral magnification of the F group at infinity focus at the telephoto end βfrt: The combined lateral magnification of the lens group on the image plane side of the F group at infinity focus at the telephoto end

23. The zoom lens according to claim 20, wherein the lens group F is composed of a single lens.

24. An imaging device comprising: the zoom lens according to any one of Claims 1 to 23; and an imaging element that is disposed on the image plane side of the zoom lens and that converts an optical image formed by the zoom lens into an electrical signal.

Images