JP2024044857A - Zoom lens and image capturing device - Google Patents

Abstract

To provide a compact, light-weight zoom lens which offers high optical performance and allows the size and weight of an anti-shake group to be reduced, and to provide an image capturing device.SOLUTION: A zoom lens (30) disclosed herein comprises a negative front group and a positive rear group in order from an object side, the front group comprising a positive lens group G1 (G1) and a negative composite lens group Gn (G2) in order from the object side, and the rear group comprising a positive composite lens group Gp (G3) having an anti-shake group Gv, a negative lens group Gf (G4), and a negative lens group Gr (G5). The zoom lens (30) has specific optical characteristics represented by two specific expressions.SELECTED DRAWING: Figure 1

Description

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

In recent years, imaging devices using solid-state imaging elements, such as digital still cameras and digital video cameras, have become widespread. As a result, the optical systems of these imaging devices have become more compact and sophisticated, and compact imaging device systems have rapidly become widespread. In particular, for telephoto zoom lenses with long focal lengths, there is a growing demand for smaller, lighter, and more sophisticated optical systems.

In particular, with a telephoto zoom lens, if vibrations are accidentally transmitted to the photographing system of the imaging device, image blurring tends to occur in the photographed image. Conventionally, various zoom lenses have been proposed that are equipped with a mechanism (anti-shake mechanism) for compensating for image blur caused by such accidental vibrations. For example, an optical system is known in which a part of a lens group constituting the optical system is moved in a direction substantially perpendicular to the optical axis to compensate for image blur caused by vibration. Generally, in order to prevent image blur by vibrating a part of a lens group, the lens group vibrated for blur correction (anti-vibration lens group) is required to be small and lightweight.

As a configuration for miniaturizing telephoto zoom lenses, for example, a zoom lens is known that has, in order from the object side, a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, and a lens group with negative refractive power in the rear group, and that changes the magnification by changing the spacing between adjacent lens groups.

In addition, as a configuration for shortening the total optical length of a zoom lens, for example, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive refractive power are used. a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and a fifth lens group having a negative refractive power, and combining the lens groups closer to the image plane than the fifth lens group at the telephoto end. Zoom lenses are known that aim to shorten the total optical length by increasing the lateral magnification. In this zoom lens, an anti-vibration group is placed in the third lens group having positive refractive power, and by moving the anti-vibration group approximately perpendicular to the optical axis, it is possible to eliminate camera shake caused by camera shake during imaging. Image blur is corrected (for example, see Patent Document 1).

Japanese Patent Application Publication No. 2014-126850

However, in the zoom lens described in Patent Document 1, the image stabilization group is not sufficiently compact, and as the image stabilization drive mechanism becomes larger, the entire zoom lens can become larger and heavier.

One aspect of the present invention aims to realize a zoom lens and imaging device that is small and lightweight, has high optical performance, and allows the vibration isolation group to be made small and lightweight.

In order to achieve the above object, a zoom lens according to one aspect of the present invention has, in order from the object side, a front group having negative refractive power and a rear group having positive refractive power, the front group has, as a lens group and a composite lens group, only a lens group G1 having positive refractive power and a composite lens group Gn having negative refractive power, the rear group has, in order from the object side, a composite lens group Gp having positive refractive power and a lens group Gf having negative refractive power, the rear group further has a lens group Gr having negative refractive power on an image surface side of the lens group Gf, the composite lens group Gp has one or more lens groups, the composite lens group Gp has an image stabilizer group Gv which has negative refractive power and moves in a direction perpendicular to the optical axis to correct image blur, a distance on the optical axis between adjacent lens groups changes when zooming between the wide-angle end and the telephoto end, the lens group G1 is fixed, and the lens group Gf moves on the optical axis when focusing, and the following formula is satisfied:
0.65≦|fv|/fpt≦2.00 (1)
0.60≦Dpvt/Dpt≦0.90 (2)
however,
fv: focal length of the vibration reduction group Gv fpt: focal length of the composite lens group Gp at the telephoto end Dpvt: distance on the optical axis at the telephoto end from the lens surface of the composite lens group Gp closest to the object to the lens surface of the vibration reduction group Gv closest to the object Dpt: distance on the optical axis at the telephoto end between the lens surface of the composite lens group Gp closest to the object and the lens surface of the composite lens group Gp closest to the image surface

In order to solve the above problem, an imaging device according to one aspect of the present invention includes the above zoom lens and an imaging element provided on the image plane side of the zoom lens, which converts the optical image formed by the zoom lens into an electrical signal.

According to one aspect of the present invention, it is possible to realize a zoom lens and an imaging device that are small and lightweight, have high optical performance, and allow the vibration isolation group to be made small and lightweight.

FIG. 3 is a diagram schematically showing the optical configuration of the zoom lens of Example 1 at the wide-angle end when focusing at infinity. FIG. 3 is a diagram showing longitudinal aberration at the wide-angle end of the zoom lens of Example 1 when focusing at infinity. 4 is a diagram showing longitudinal aberration of the zoom lens of Example 1 in a middle focal length state when focused on infinity. FIG. FIG. 3 is a diagram showing longitudinal aberration at the telephoto end of the zoom lens of Example 1 when focusing at infinity. FIG. 11 is a diagram illustrating an optical configuration of a zoom lens according to a second embodiment at a wide-angle end when focused on infinity. 13A and 13B are diagrams illustrating longitudinal aberration at the wide-angle end when the zoom lens of Example 2 is focused on an object at infinity. 7 is a diagram showing longitudinal aberration of the zoom lens of Example 2 at an intermediate focal length state when focusing at infinity. FIG. FIG. 7 is a diagram showing longitudinal aberration at the telephoto end of the zoom lens of Example 2 when focusing at infinity. FIG. 7 is a diagram schematically showing the optical configuration of the zoom lens of Example 3 at the wide-angle end when focusing at infinity. 7 is a diagram showing longitudinal aberration at the wide-angle end of the zoom lens of Example 3 when focusing at infinity. FIG. 13 is a diagram showing longitudinal aberration of the zoom lens of Example 3 in a middle focal length state when focused on infinity. FIG. 7 is a diagram showing longitudinal aberration at the telephoto end of the zoom lens of Example 3 when focusing at infinity; FIG. FIG. 7 is a diagram schematically showing the optical configuration of the zoom lens of Example 4 at the wide-angle end when focusing at infinity. 13A and 13B are diagrams illustrating longitudinal aberration at the wide-angle end of the zoom lens of Example 4 when focused on an object at infinity. 13 is a diagram showing longitudinal aberration of the zoom lens of Example 4 in a middle focal length state when focused on infinity. FIG. 13A and 13B are diagrams illustrating longitudinal aberration at the telephoto end when the zoom lens of Example 4 is focused on an object at infinity. FIG. 13 is a diagram illustrating an optical configuration of a zoom lens according to a fifth embodiment at a wide-angle end when focused on infinity. 7 is a diagram showing longitudinal aberration at the wide-angle end of the zoom lens of Example 5 when focusing at infinity. FIG. FIG. 13 is a diagram showing longitudinal aberration of the zoom lens of Example 5 in a middle focal length state when focused on infinity. FIG. 7 is a diagram showing longitudinal aberration at the telephoto end of the zoom lens of Example 5 when focusing at infinity. FIG. 13 is a diagram illustrating an optical configuration of a zoom lens according to a sixth embodiment at a wide-angle end when focused on infinity. FIG. 7 is a diagram showing longitudinal aberration at the wide-angle end of the zoom lens of Example 6 when focusing at infinity. FIG. 12 is a diagram showing longitudinal aberration of the zoom lens of Example 6 at an intermediate focal length state when focusing at infinity. FIG. 9 is a diagram showing longitudinal aberration at the telephoto end of the zoom lens of Example 6 when focusing at infinity. FIG. 13 is a diagram illustrating an optical configuration of a zoom lens according to a seventh embodiment at a wide-angle end when focused on infinity. FIG. 7 is a diagram showing longitudinal aberration at the wide-angle end of the zoom lens of Example 7 when focusing at infinity. FIG. 12 is a diagram showing longitudinal aberration of the zoom lens of Example 7 at an intermediate focal length state when focusing at infinity. FIG. 13 is a diagram showing longitudinal aberration at the telephoto end when the zoom lens of Example 7 is focused on infinity. FIG. 23 is a diagram illustrating an optical configuration of a zoom lens according to an eighth embodiment at a wide-angle end when focused on infinity. FIG. 23 is a diagram showing longitudinal aberration at the wide-angle end when the zoom lens of Example 8 is focused on an object at infinity. FIG. 12 is a diagram showing longitudinal aberration of the zoom lens of Example 8 at an intermediate focal length state when focusing at infinity. FIG. 23 is a diagram showing longitudinal aberration at the telephoto end when the zoom lens of Example 8 is focused on infinity. 1 is a diagram schematically showing an example of the configuration of an imaging device according to an embodiment of the present invention.

The following describes an embodiment of a zoom lens and an imaging device according to one embodiment of the present invention. More specifically, this embodiment relates to a zoom lens and an imaging device suitable for imaging devices that use solid-state imaging elements (CCD, CMOS, etc.) such as digital still cameras and digital video cameras. 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 aspect. In this specification, "in order" means arranged adjacently, unless otherwise specified.

1. Zoom lens 1-1. Optical configuration The zoom lens according to an embodiment of the present invention has, in order from the object side, a front group having negative refractive power and a rear group having positive refractive power. The zoom lens according to an embodiment of the present invention may be composed of only a front group and a rear group. The front group is a collection of a plurality of lens groups on the object side that have negative refractive power as a whole, and the rear group is a collection of a plurality of lens groups on the image side that have positive refractive power as a whole. In the case where there are a plurality of combinations of the front group and the rear group under the above conditions, the collection on the object side when the distance on the optical axis between the front group, the lens group closest to the image surface, and the lens group closest to the object surface of the rear group is the widest at the wide-angle end of the zoom lens is the front group, and the collection on the image surface side is the rear group.

In this specification, a "lens group" includes one or more lenses. A "lens group" is one lens or a group of two or more lenses in which the distance between adjacent lens groups changes when changing the magnification between the wide-angle end and the telephoto end. When the lens group includes a plurality of lenses, the plurality of lenses maintain a relative positional relationship during zooming between the wide-angle end and the telephoto end. The lens group may be configured to be movable on the optical axis or may be fixed.

In this specification, a "synthetic lens group" is a group of lenses determined according to the position on the optical axis and the overall refractive power. A composite lens group is composed of one or more lens groups. When the composite lens group consists of two or more lens groups, each lens group can be moved independently along the optical axis.

A lens group may have one or more subgroups. A subgroup is made up of one or more lenses in a lens group. When a subgroup is made up of two or more lenses, it is made up of two or more lenses arranged in succession along the optical axis. The subgroup is fixed within the lens group, i.e., the subgroup is configured so that it can move on the optical axis with the lens group, but cannot move on the optical axis independently within the lens group. A subgroup can be identified as a lens or a set of two or more lenses that achieves a particular optical characteristic, such as the refractive power of the entire subgroup, from the lenses in the lens group.

The zoom lens may have a cemented lens. An example of a cemented lens is a cemented lens in which multiple lenses are integrated together with no air gap between them. Another example of a cemented lens is a cemented lens in which multiple lenses are integrated together and bonded together with a very thin adhesive that has a thickness that does not substantially affect the optical performance. The number of lenses in a cemented lens is the number of lenses that are bonded together. The adhesive layer is not counted as a lens.

The zoom lens may have a compound lens in which one lens and resin are integrated. A compound lens is counted as one lens.

(1) Front group The front group has negative refractive power as a whole. The front group includes, as a lens group and a composite lens group, in order from the object side, only a lens group G1 having a positive refractive power and a composite lens group Gn having a negative refractive power. It is preferable to arrange the lens group G1 having a positive refractive power closest to the object side from the viewpoint of providing a telephoto type refractive power arrangement and shortening the total optical length of the zoom lens compared to the focal length.

(2) Lens group G1
Lens group G1 has positive refractive power. The lens group G1 includes, in order from the object side, a sub group G1a that is disposed closest to the object side and has a positive refractive power, and a sub group G1b that is disposed at an air interval from the sub group G1a. You may do so. This configuration is preferable from the viewpoint of reducing the diameter of the sub group G1b and from the viewpoint of reducing the weight of the lens group G1, which has the largest proportion of lens weight among the lens groups included in the zoom lens.

Sub group G1a may include one or more lenses having positive refractive power. The sub group G1a may include two or more lenses having positive refractive power. It is preferable for the subgroup G1a to have two or less lenses having positive refractive power from the viewpoint of reducing the weight of the subgroup G1a and from the viewpoint of efficiently and easily lowering the height of the light rays incident on the subgroup G1b. Further, it is preferable that the sub group G1a does not include a lens having negative refractive power from the viewpoint of reducing the weight of the lens group G1.

Sub-group G1b may include one or more lenses with positive refractive power and one or more lenses with negative refractive power. It is preferable that the sub group G1b includes a lens having a positive refractive power and a lens having a negative refractive power from the viewpoint of correcting spherical aberration and chromatic aberration well and easily. It is preferable from the viewpoint of reducing the weight of the lens group G1 that one of the lenses having positive refractive power in the sub group G1b is disposed closest to the object side of the sub group G1b. Furthermore, the lens having a negative refractive power of the sub group G1b is made of a material having a higher specific gravity than the lens having a positive refractive power of the sub group G1a or the lens having a positive refractive power of the sub group G1b. Tend. Therefore, from the viewpoint of reducing the weight of the lens group G1, it is preferable that the air gap between the sub group G1a and the sub group G1b is the maximum air gap in the lens group G1.

It is preferable for lens group G1 to have one or more lenses with negative refractive power from the viewpoint of good and easy correction of spherical aberration and chromatic aberration. Lens group G1 may have multiple lenses with negative refractive power that satisfy equation (8) described below. The lens with negative refractive power included in lens group G1 may be a lens with negative refractive power included in subgroup G1b.

(3) Composite Lens Group Gn
The composite lens group Gn has a negative refractive power as a whole. The configuration of the composite lens group Gn may be appropriately determined within a range in which the composite lens group Gn has a negative refractive power as a whole. For example, the composite lens group Gn may have one or more lens groups, and may be composed of only one lens group, or may be composed of multiple lens groups. For example, the composite lens group Gn may have one or more lens groups having a negative refractive power. It is preferable that the composite lens group Gn is composed of multiple lens groups from the viewpoint of correcting spherical aberration and curvature of field well and easily over the entire zoom range by changing the interval between adjacent lens groups when changing the magnification between the wide-angle end and the telephoto end. When the composite lens group Gn is composed of multiple lens groups, the multiple lens groups may have at least one lens group having a positive refractive power.

The composite lens group Gn preferably includes at least one lens having negative refractive power, and more preferably includes two or more lenses having negative refractive power. Such a configuration is preferable from the viewpoint of providing the composite lens group Gn with a strong negative refractive power and obtaining a zoom lens with a high zoom ratio.

Furthermore, it is preferable that the composite lens group Gn has at least one lens with positive refractive power. It is preferable that the composite lens group Gn has two or more lenses with negative refractive power and one or more lenses with positive refractive power, from the viewpoint of correcting various aberrations well and achieving both high zoom ratio and high performance. In this case, it is preferable that the lens closest to the object side in the composite lens group Gn is a lens with positive refractive power, since this can lower the height of the light rays incident on the lens group arranged on the image plane side of the composite lens group Gn, thereby contributing to the miniaturization and weight reduction of the entire zoom lens.

(4) Rear Group The rear group has positive refractive power as a whole. The rear group has, in order from the object side, a composite lens group Gp having positive refractive power, and a lens group Gf having negative refractive power. The rear group further has a lens group Gr having negative refractive power located closer to the image surface than the lens group Gf. This configuration can further strengthen the refractive power arrangement of the telephoto type, and is therefore preferable from the viewpoint of easily realizing a zoom lens with a short overall length.

The rear group may be composed of only the aforementioned composite lens group Gp, lens group Gf, and lens group Gr, or may further include other lens groups. The rear group may have one or more lens groups between lens group Gf and lens group Gr. Alternatively, the rear group may have one or more lens groups on the image surface side of lens group Gr.

(5) Composite lens group Gp
The composite lens group Gp has positive refractive power as a whole. The composite lens group Gp has one or more lens groups, and may be composed of only one lens group, or may have a plurality of lens groups. When the composite lens group Gp is composed of a plurality of lens groups, the plurality of lens groups may include at least one lens group having negative refractive power.

When the composite lens group Gp is composed of a plurality of lens groups, it is preferable to have a lens group having a positive refractive power closest to the object side. In addition, the composite lens group Gp includes, in order from the object side, a first lens having positive refractive power, a second lens having positive refractive power, a third lens having positive refractive power, and a first negative refractive power. It is more preferable to have a lens having a refractive power of (that is, to include a lens arrangement in which the refractive power of the lens is positive, positive, positive, or negative). Such a configuration is preferable from the viewpoint of strengthening the telephoto type refractive power arrangement and realizing miniaturization of the lens group and the aperture diameter arranged closer to the image plane than the composite lens group Gp.

The composite lens group Gp has a vibration-reduction group Gv that has negative refractive power and moves in a direction perpendicular to the optical axis to correct image blur. The vibration-reduction group Gv is a collection of one or more lenses. It is preferable that the vibration-reduction group Gv be arranged closer to the image surface than the first lens having negative refractive power, since this makes the angle of incidence of the axial light beam incident on the vibration-reduction group Gv gentler and suppresses the occurrence of decentering aberrations during vibration reduction. It is preferable that the vibration-reduction group Gv be arranged closer to the image surface in the composite lens group Gp, from the viewpoint of realizing a smaller diameter for the vibration-reduction group Gv.

The configuration of the vibration-reduction group Gv can be determined appropriately within the range in which the entire group has negative refractive power. It is preferable for the vibration-reduction group Gv to be composed of two or fewer lenses, from the viewpoint of realizing a compact vibration-reduction drive mechanism. It is also preferable for the vibration-reduction group Gv to be composed only of a cemented lens in which one lens having positive refractive power and one lens having negative refractive power are cemented together, from the viewpoint of effectively correcting chromatic aberration during vibration reduction.

It is preferable that the composite lens group Gp has one or more lenses on the object side of the anti-vibration group Gv and on the image side of the anti-vibration group Gv. Furthermore, it is preferable that the lenses on the object side of the anti-vibration group Gv in the composite lens group Gp have a positive refractive power as a whole, and it is preferable that the lenses on the image side of the anti-vibration group have a positive refractive power as a whole. This configuration is advantageous for miniaturizing the anti-vibration group Gv and the lenses arranged on the image side of the anti-vibration group Gv. Furthermore, it is preferable that the composite lens group Gp is composed of only one lens group. This configuration is preferable from the viewpoint of simplifying the cam structure, and therefore from the viewpoint of miniaturizing the lens barrel of the zoom lens. It is also advantageous for suppressing decentering errors that occur when changing magnification between the wide-angle end and the telephoto end. Therefore, the above configuration is preferable from the viewpoint of realizing a zoom lens with little manufacturing variation.

The arrangement of the lenses on the object side of the anti-vibration group Gv in the composite lens group Gp can be appropriately determined so as to have a positive refractive power overall. More preferably, the lens arrangement on the object side has, in order from the object side, a positive lens, a positive lens, a positive lens, and a negative lens, and more preferably has at least two positive lenses and at least two negative lenses. Note that "positive lens" means a lens having a positive refractive power, and "negative lens" means a lens having a negative refractive power. Arranging the lenses in order from the object side to three positive lenses is preferable from the viewpoint of reducing the lens diameter (particularly the anti-vibration group Gv and the lens group Gf) arranged on the image surface side from the arrangement of the lenses, and the aperture diameter of the aperture diaphragm. Therefore, it is preferable from the viewpoint of miniaturizing the anti-vibration drive mechanism, the focus mechanism unit, and the aperture mechanism unit. In addition, in the lens arrangement, it is preferable to arrange the lenses to include at least three negative lenses, because it is easy to satisfactorily correct the various aberrations of the composite lens group Gp having a strong positive refractive power, and it is also preferable from the viewpoint of suppressing the occurrence of decentering aberrations during anti-vibration.

The arrangement of the lenses on the image side of the anti-vibration group Gv in the composite lens group Gp can be appropriately determined so as to have a positive refractive power overall. For example, the arrangement of the lenses on the image side may be composed of only one positive lens, or may be composed of multiple lenses including a negative lens. Including a negative lens on the image side of the anti-vibration group Gv in the composite lens group Gp is preferable from the viewpoint of good and easy correction of spherical aberration over the entire object distance, especially at the telephoto end.

(6) Lens group Gf
The lens group Gf is disposed at a position adjacent to the image surface side of the composite lens group Gp. Such a configuration is preferable from the viewpoint of realizing the miniaturization and weight reduction of the zoom lens and the miniaturization of the focus mechanism. The lens group Gf has a negative refractive power as a whole and has at least one lens having a negative refractive power. The configuration of the lens group Gf can be appropriately determined within the range of having a negative refractive power as a whole and having at least one lens having a negative refractive power. For example, it is preferable that the lens group Gf further has a lens having a positive refractive power from the viewpoint of suppressing aberration fluctuations over the entire object distance. In addition, it is preferable that the lens group Gf has, in order from the object side, a lens having a positive refractive power and a lens having a negative refractive power from the viewpoint of realizing the miniaturization and weight reduction of the lens group Gf.

(7) Lens group Gr
Lens group Gr is arranged on the image plane side of lens group Gf, and has negative refractive power. In the case where a plurality of lens groups having a negative refractive index are arranged on the image plane side of the lens group Gf, the lens group Gr is a plurality of lens groups having a negative refractive index arranged on the image plane side of the lens group Gf. Among them, this lens group has the strongest negative refractive power. The configuration of the lens group Gr can be appropriately determined within a range in which the entire lens group has negative refractive power. For example, the lens group Gr may include one or more lenses having negative refractive power. In addition, the fact that the lens group Gr includes two or more lenses with negative refractive power and one or more lenses with positive refractive power is advantageous from the viewpoint of strengthening the telephoto type structure and reducing the overall length of the zoom lens. This is preferable from the viewpoint of realizing both shortening and high performance.

(8) Aperture diaphragm In the zoom lens, the aperture diaphragm may be disposed in the front group, may be disposed in the rear group, or may be disposed between the front group and the rear group. Moreover, it is preferable that the aperture diaphragm is disposed in the rear group, and may be disposed, for example, in the composite lens group Gp, or may be disposed between the composite lens group Gp and the lens group Gf. Disposing the aperture diaphragm in the rear group is preferable from the viewpoint of realizing a compact aperture diaphragm unit. Disposing the aperture diaphragm in the composite lens group Gp or between the composite lens group Gp and the lens group Gf is preferable from the viewpoint of realizing a compact aperture diaphragm unit, since the diameter of the incident light beam becomes small.

1-2. Operation (1) Magnification change In the zoom lens, the distance between adjacent lens groups on the optical axis changes when the magnification is changed between the wide-angle end and the telephoto end. The distance between each lens group on the optical axis changes when the magnification is changed between the wide-angle end and the telephoto end, and some lens groups may be fixed in the optical axis direction (do not move on the optical axis). The lens group G1 is the heaviest lens group among the lens groups of the zoom lens. Therefore, in order to move the heavy lens group to a predetermined position with high accuracy when the magnification is changed, the load applied to the member for driving the lens group G1 is also large, and the structure for driving the lens group G1 may also become large. From the viewpoint of realizing a compact zoom lens, it is preferable that the lens group G1 is fixed when the magnification is changed between the wide-angle end and the telephoto end.

It is also preferable that at least one of the one or more lens groups in the composite lens group Gn moves along the optical axis toward the image plane when changing magnification from the wide-angle end to the telephoto end. If the composite lens group Gn has multiple lens groups, all of the lens groups may move when changing magnification. It is preferable that the lens groups in the composite lens group Gn move in this manner when changing magnification from the viewpoint of reducing the diameter of the lens groups subsequent to the composite lens group Gn at the telephoto end.

When changing the magnification between the wide-angle end and the telephoto end, it is preferable that the distance between the composite lens group Gp and the lens group Gf on the optical axis be widened at the middle of the zoom. It is preferable to move in this manner from the viewpoint that it becomes easy to satisfactorily correct the curvature of field over the entire zoom range.

When changing the magnification from the wide-angle end to the telephoto end, the lens group Gr may be configured not to move on the optical axis, or may be moved on the optical axis toward the object side. When changing the magnification from the wide-angle end to the telephoto end, moving the lens group Gr with negative refractive power toward the object side on the optical axis can increase the zoom ratio, so it is possible to use a zoom lens with a high zoom ratio. This is preferable from the point of view of implementation.

(2) Focusing During focusing, the lens group Gf moves on the optical axis. During focusing from an infinity focus state to a closest focus state, the lens group Gf preferably moves toward the image plane along the optical axis. Such a configuration is preferable in a zoom lens in which the focus group is closer to the image plane than the aperture stop, from the viewpoint of suppressing fluctuations in the aperture diameter from the infinity focus state to the closest focus state. Further, the lens group Gf is arranged on the image plane side of the composite lens group Gp having positive refractive power. Therefore, the lens group Gf can be easily made smaller and lighter, which is preferable from the viewpoint of reducing the size of the focusing mechanism.

The focus group in the zoom lens may further include other lens groups in addition to the lens group Gf. For example, the zoom lens may be configured to focus by moving one or more lens groups having positive or negative refractive power arranged on the image surface side of the lens group Gf along the optical axis on a movement trajectory different from that of the lens group Gf. In this way, the zoom lens may employ a so-called floating focus method. Such a configuration is preferable from the viewpoint of better correcting spherical aberration and field curvature over the entire object distance.

1-3. Equations Expressing the Conditions of the Zoom Lens It is desirable for the zoom lens according to this embodiment to employ the configuration described above and to satisfy at least one of the following equations.

1-3-1. Formula (1)
0.65≦|fv|/fpt≦2.00 (1)
however,
fv: Focal length of the anti-vibration group Gv fpt: Focal length of the composite lens group Gp at the telephoto end

Equation (1) is an equation for appropriately setting the ratio between the refractive power of the vibration reduction group Gv and the refractive power of the composite lens group Gp at the telephoto end. Satisfying equation (1) is preferable from the standpoint of suppressing aberrations that occur during vibration reduction while controlling the drive amount of the vibration reduction group Gv during vibration reduction within an appropriate range.

When |fv|/fpt is less than the lower limit of equation (1), the amount of drive of the anti-vibration group Gv for correcting image blur becomes small, which is advantageous for downsizing the anti-vibration drive mechanism. It may be difficult to satisfactorily correct spherical aberration and astigmatism. Furthermore, when |fv|/fpt exceeds the upper limit of equation (1), the amount of drive of the anti-vibration group Gv for correcting image blur becomes large, so the anti-vibration drive mechanism becomes larger and the overall size of the zoom lens increases. It may be difficult to achieve miniaturization.

From the viewpoint of properly correcting spherical aberration and astigmatism during image stabilization, |fv|/fpt is more preferably 0.70 or more, more preferably 0.80 or more, and 0.90 It is more preferably 1.00 or more, and more preferably 1.00 or more. Further, from the viewpoint of realizing miniaturization of the entire zoom lens, |fv|/fpt is more preferably 1.90 or less, more preferably 1.80 or less, and more preferably 1.70 or less. It is more preferable that it is 1.65 or less.

1-3-2. Equation (2)
0.60≦Dpvt/Dpt≦0.90 (2)
however,
Dpvt: distance on the optical axis at the telephoto end from the lens surface of the composite lens group Gp closest to the object to the lens surface of the image stabilization group Gv closest to the object. Dpt: distance on the optical axis at the telephoto end from the lens surface of the composite lens group Gp closest to the object. The distance on the optical axis at the telephoto end to the lens surface of the composite lens group Gp closest to the image surface

Equation (2) is based on the distance on the optical axis at the telephoto end between the lens surface closest to the object side of the composite lens group Gp and the lens surface closest to the image plane of the composite lens group Gp. This is a formula for appropriately setting the position of the group Gv in the optical axis direction at the telephoto end. Specifically, equation (2) is based on the distance on the optical axis at the telephoto end between the lens surface closest to the object side of the composite lens group Gp and the lens surface closest to the image plane of the composite lens group Gp. It is defined by the ratio of the distance on the optical axis at the telephoto end from the lens surface closest to the object side of the composite lens group Gp to the lens surface closest to the object side of the anti-vibration group Gv. Satisfying formula (2) is preferable from the viewpoint of realizing miniaturization of the vibration-proof drive mechanism and optimization of the arrangement of the vibration-proof drive mechanism and the focus mechanism.

When Dpvt/Dpt falls below the lower limit of equation (2), the position of the vibration-reduction group Gv within the composite lens group Gp is positioned closer to the object side, which may make it difficult to sufficiently miniaturize the vibration-reduction group Gv and to miniaturize the vibration-reduction drive mechanism. Also, when Dpvt/Dpt exceeds the upper limit of equation (2), the distance on the optical axis between the vibration-reduction group Gv and the lens group Gf becomes too close, which may make it difficult to simultaneously position the vibration-reduction drive mechanism and the focus mechanism.

From the viewpoint of downsizing the anti-vibration drive mechanism and optimizing the arrangement of the anti-vibration drive mechanism and the focus mechanism, Dpvt/Dpt is more preferably 0.62 or more, and more preferably 0.64 or more. , more preferably 0.66 or more, more preferably 0.68 or more, and even more preferably 0.70 or more. Further, from the viewpoint of arranging the anti-vibration drive mechanism and the focus mechanism at the same time, Dpvt/Dpt is more preferably 0.88 or less, more preferably 0.86 or less, and 0.84 or less. is more preferable.

1-3-3. Equation (3)
0.60≦fp1t/fpt≦1.80 (3)
however,
fp1t: focal length at the telephoto end of all lenses arranged on the object side of the image stabilization group Gv in the composite lens group Gp fpt: focal length at the telephoto end of the composite lens group Gp

Equation (3) is expressed as the telephoto end of a set of all lenses arranged closer to the object side than the image stabilization group Gv in the composite lens group Gp with respect to the focal length at the telephoto end when the composite lens group Gp is focused at infinity. This is a formula for appropriately setting the focal length ratio at . Satisfying formula (3) is preferable from the viewpoints of shortening the overall optical length of the zoom lens and achieving a balance between miniaturization of the anti-vibration drive mechanism and optical performance.

Below the lower limit of formula (3) is advantageous in shortening the overall length, but the refractive power of the lens group on the object side described above may become too strong, making it difficult to effectively correct spherical aberration and coma aberration. On the other hand, exceeding the upper limit of formula (3) may make it difficult to reduce the size of the vibration-proof drive mechanism because the lens diameter of the vibration-proof group Gv cannot be reduced.

From the viewpoint of effectively correcting spherical aberration and coma aberration, fp1t/fpt is preferably 0.65 or more, more preferably 0.70 or more, more preferably 0.75 or more, more preferably 0.80 or more, and more preferably 0.85 or more. From the viewpoint of miniaturizing the anti-vibration drive mechanism, fp1t/fpt is preferably 1.70 or less, more preferably 1.60 or less, more preferably 1.50 or less, and more preferably 1.45 or less.

1-3-4. Formula (4)
-0.90≦fr/ft≦-0.03...(4)
however,
fr: Focal length of lens group Gr ft: Focal length at the telephoto end when focusing on infinity of the zoom lens

Equation (4) is an equation for appropriately setting the ratio between the focal length of the lens group Gr and the focal length of the zoom lens at the telephoto end when focusing on infinity. Specifically, equation (4) is an equation for appropriately setting the focal length of the lens group Gr relative to the focal length of the zoom lens at the telephoto end when focusing on infinity. Satisfying equation (4) is preferable from the viewpoint of ensuring a telephoto type refractive power arrangement and easily realizing the miniaturization of the entire zoom lens.

When fr/ft is below the lower limit of formula (4), the telephoto type refractive power arrangement becomes weak, and it may be difficult to achieve a small overall length. For example, if the positive refractive power of lens group G1 is strengthened to ensure a telephoto configuration, it may be difficult to effectively correct chromatic aberration in particular. Also, when fr/ft is above the upper limit of formula (4), the telephoto type refractive power arrangement becomes too strong, and it may be difficult to effectively correct strong curvature of field in the over direction.

From the viewpoint of realizing a reduction in overall length, fr/ft is more preferably -0.80 or more, more preferably -0.75 or more, more preferably -0.70 or more, more preferably -0.65 or more, more preferably -0.60 or more, more preferably -0.55 or more, and more preferably -0.50 or more. Also, from the viewpoint of effectively correcting strong curvature of field in the over-angle direction, fr/ft is more preferably -0.08 or less, more preferably -0.13 or less, more preferably -0.18 or less, more preferably -0.23 or less, and more preferably -0.28 or less.

1-3-5. Formula (5)
1.01≦βrt/βrw≦1.50 (5)
however,
βrt: Lateral magnification of the lens group Gr at the telephoto end when focused at infinity βrw: Lateral magnification of the lens group Gr at the wide-angle end when focused at infinity

Equation (5) is an equation for appropriately setting the ratio between the lateral magnification at the telephoto end and the lateral magnification at the wide-angle end when the lens group Gr is focused at infinity. Specifically, equation (5) is used to appropriately set the lateral magnification at the telephoto end when the lens group Gr is focused at infinity relative to the lateral magnification at the wide-angle end when the lens group Gr is focused at infinity. The formula is It is preferable to satisfy formula (5) from the viewpoint of appropriately setting the zoom ratio of the lens group Gr and achieving both high performance and high zoom ratio.

If βrt/βrw is less than the lower limit of equation (5), the lens group Gr may not be able to change the magnification, and it may be difficult to achieve a high variable magnification. In order to achieve a high zoom ratio, the amount of movement of at least one lens group included in the composite lens group Gn becomes large, which may make it difficult to reduce the overall length of the zoom lens. Furthermore, if βrt/βrw exceeds the upper limit of equation (5), the load on the lens group Gr for changing magnification becomes too large, and it may become difficult to satisfactorily correct field curvature.

From the viewpoint of achieving a high zoom ratio, βrt/βrw is preferably 1.03 or more, more preferably 1.05 or more, and even more preferably 1.07 or more. From the viewpoint of satisfactorily correcting the field curvature, βrt/βrw is preferably 1.40 or less, more preferably 1.30 or less, and even more preferably 1.25 or less.

1-3-6. Equation (6)
0.35≦Lt/ft≦0.70 (6)
however,
Lt: total optical length at the telephoto end of the zoom lens when focused at infinity ft: focal length at the telephoto end of the zoom lens when focused at infinity

Equation (6) is an equation for appropriately setting the ratio of the total optical length at the telephoto end when the zoom lens is focused at infinity and the focal length at the telephoto end when the zoom lens is focused at infinity. . Specifically, equation (6) is an equation for appropriately setting the optical total length at the telephoto end when the zoom lens is focused at infinity relative to the focal length at the telephoto end when the zoom lens is focused at infinity. It is. Specifically, the "optical total length" of a zoom lens is the total length on the optical axis from the object-side lens surface of the lens closest to the object among the lenses constituting the zoom lens to the image plane. Satisfying equation (6) is preferable from the viewpoint of realizing a compact and lightweight zoom lens with a short overall optical length relative to the focal length.

If Lt/ft is less than the lower limit of equation (6), the total optical length of the zoom lens may become too short relative to the focal length, making it difficult to satisfactorily correct various aberrations. Furthermore, the sensitivity of each lens to errors increases, and the optical performance may deteriorate too much due to manufacturing errors. When Lt/ft exceeds the upper limit of equation (6), the amount of movement of each lens group during zooming increases in order to obtain a predetermined zoom ratio, and the amount of movement of each lens group along the optical axis increases. This may lead to an increase in the size of the variable power drive mechanism, making it difficult to realize a desired compact and lightweight zoom lens.

From the viewpoint of correcting various aberrations well and maintaining optical performance, Lt/ft is more preferably 0.38 or more, more preferably 0.41 or more, and more preferably 0.44 or more. is more preferable, and more preferably 0.47 or more. Further, from the viewpoint of realizing a compact and lightweight zoom lens, Lt/ft is more preferably 0.68 or less, more preferably 0.66 or less, and even more preferably 0.64 or less. It is preferably 0.62 or less, more preferably 0.60 or less.

1-3-7. Formula (7)
5.0≦｜{1-(βft) ² }×(βcrt) ² |≦13.0・・・・・・(7)
however,
βft: Lateral magnification at the telephoto end when lens group Gf is focused at infinity βcrt: Lateral magnification at the telephoto end when all lens groups on the image plane side than lens group Gf are focused at infinity

Equation (7) is an equation for appropriately setting the relationship |{1-(βft)2}×(βcrt) ² | between the lateral magnification of the lens group Gf at the telephoto end when focused at infinity and the lateral magnifications of all lens groups on the image plane side of the lens group ^Gf at the telephoto end when focused at infinity. Satisfying equation (7) is preferable from the viewpoint of controlling the focus position sensitivity within an appropriate range when the lens group Gf is used as the focus group.

If |{1−(βft) ² }×(βcrt) ² | is less than the lower limit of equation (7), the amount of focus movement becomes too large, which may lead to an increase in the size of the focus actuator. Furthermore, if |{1-(βft) ² }×(βcrt) ² | exceeds the upper limit of equation (7), the amount of focus movement per amount of movement of the focus group, that is, the focus position sensitivity, becomes too large. , since the required focusing drive accuracy becomes high, focusing control may become difficult.

From the viewpoint of preventing the focus actuator from becoming large, |{1-(βft) ² }×(βcrt) ² | is more preferably 5.4 or more, more preferably 5.8 or more, more preferably 6.2 or more, more preferably 6.6 or more, and more preferably 7.0 or more. Also, |{1-(βft) ² }×(βcrt) ² | is more preferably 12.5 or less, more preferably 12.0 or less, more preferably 11.5 or less, more preferably 11.0 or less, and more preferably 10.5 or less.

1-3-8. Equation (8)
−0.012≦ΔPgF1≦−0.001 (8)
however,
ΔPgF1: Anomalous dispersion of the lens having negative refractive power in the lens group G1

Formula (8) is a formula for appropriately setting the anomalous dispersion ΔPgF1 at the g-line and F-line of the lens having a negative refractive power in the lens group G1. When the lens group G1 includes multiple lenses having a negative refractive power, at least one lens having a negative refractive power needs to satisfy formula (8). Here, "anomalous dispersion" represents the deviation of the partial dispersion ratio from a reference line when a straight line passing through the coordinates of glass material C7 with a partial dispersion ratio of 0.5393 and νd of 60.49 and the coordinates of glass material F2 with a partial dispersion ratio of 0.5829 and νd of 36.30 is used as the reference line in a coordinate system with the partial dispersion ratio of the g-line and F-line on the vertical axis and the Abbe number νd for the d-line on the horizontal axis.

In general, in zoom lenses, chromatic aberration correction is performed by using a low-dispersion glass material for lenses with positive refractive power and a high-dispersion glass material for lenses with negative refractive power. However, when a straight line passing through the coordinates of the partial dispersion ratios and the Abbe number (νd) for the d-line of glass materials C7 and F2 is taken as a reference line, the deviation of the partial dispersion ratio of the low-dispersion glass material from the reference line is located in the positive direction. In this case, in order to perform good chromatic aberration correction even on the short wavelength side of the visible light range, it is necessary to use a lens with a partial dispersion ratio deviation from the reference line located in the negative direction for the high-dispersion glass material. Therefore, satisfying formula (8) is preferable from the viewpoint of easily realizing a zoom lens with high optical performance in which lateral chromatic aberration is well corrected, especially at the telephoto end.

When ΔPgF1 is below the lower limit of formula (8), excessive chromatic aberration correction may cause the curvature of the lens with negative refractive power in lens group G1 to become too strong. When the curvature of the lens with negative refractive power in lens group G1 becomes strong, it has a large impact on the lens weight, and it may become difficult to realize a lightweight zoom lens. Furthermore, when ΔPgF1 exceeds the upper limit of formula (8), chromatic aberration correction on the short wavelength side at the telephoto end becomes insufficient, and it may become difficult to realize a zoom lens with high optical performance.

From the viewpoint of realizing weight reduction of the zoom lens, ΔPgF1 is more preferably -0.010 or more, more preferably -0.009 or more, more preferably -0.008 or more, More preferably, it is -0.007 or more. Furthermore, from the viewpoint of realizing a zoom lens with high optical performance, ΔPgF1 is more preferably -0.002 or less, more preferably -0.003 or less, and -0.004 or less. is more preferable, and more preferably −0.005 or less.

1-3-9. Equation (9)
0.015≦ΔPgFr≦0.050 (9)
however,
ΔPgFr: Anomalous dispersion of a lens having a negative refractive power in the lens group Gr

Equation (9) is a formula for appropriately setting the anomalous dispersion ΔPgFr at the g-line and F-line of the lens having negative refractive power in the lens group Gr. When the lens group Gr includes multiple lenses having negative refractive power, it is sufficient that at least one lens having negative refractive power satisfies equation (9).

In general, telephoto zoom lenses tend to generate lateral chromatic aberration on the short wavelength side in the under direction at the telephoto end. Therefore, satisfying formula (9) is preferable from the viewpoint of generating lateral chromatic aberration on the short wavelength side by lens group G1 in the over direction and correcting it so as to cancel it out. If lateral chromatic aberration on the short wavelength side is generated in the over direction by lens group G1, axial chromatic aberration on the short wavelength side will be generated on the under side. Therefore, satisfying formula (9) is preferable from the viewpoint of favorably correcting axial chromatic aberration on the short wavelength side in the under direction. Therefore, satisfying formula (9) is preferable from the viewpoint of easily realizing a zoom lens having high optical performance with favorable correction of chromatic aberration.

If ΔPgFr is below the lower limit of formula (9), the correction of axial chromatic aberration at the telephoto end will be insufficient, and it may be difficult to realize a zoom lens with high optical performance. Also, if ΔPgFr is above the upper limit of formula (9), it may be difficult to achieve a good balance between axial chromatic aberration and lateral chromatic aberration.

From the viewpoint of realizing a zoom lens with high optical performance, ΔPgFr is more preferably 0.017 or more, more preferably 0.019 or more, more preferably 0.021 or more, and 0. More preferably, it is .023 or more. Further, from the viewpoint of achieving a good balance between longitudinal chromatic aberration and lateral chromatic aberration, ΔPgFr is more preferably 0.045 or less, more preferably 0.040 or less, and 0.035 or less. It is even more preferable.

1-3-10. Formula (10)
0.05≦fpt/ft≦0.20 (10)
however,
fpt: Focal length at the telephoto end of the composite lens group Gp ft: Focal length at the telephoto end when focusing on infinity of the zoom lens

Equation (10) is an equation for appropriately setting the ratio between the focal length of the composite lens group Gp at the telephoto end and the focal length of the zoom lens at the telephoto end when focusing at infinity. Specifically, equation (10) is an equation for appropriately setting the focal length of the composite lens group Gp at the telephoto end relative to the focal length of the zoom lens at the telephoto end when focusing at infinity. Satisfying equation (10) is preferable from the standpoint of realizing a compact, lightweight zoom lens with a short overall length that easily corrects various aberrations.

If fpt/ft is less than the lower limit of equation (10), the refractive power of the composite lens group Gp will become too strong, making it difficult to properly correct spherical aberration and comatic aberration, making it difficult to use a zoom lens with high optical performance. This may be difficult to achieve. Furthermore, if fpt/ft exceeds the upper limit of equation (10), it may be difficult to shorten the total length of the zoom lens at the telephoto end. In order to realize a compact zoom lens with a desired short overall length, it is necessary to increase the positive refractive power of the lens group G1, which may make it particularly difficult to correct chromatic aberrations well.

From the viewpoint of realizing a zoom lens with high optical performance, fpt/ft is more preferably 0.06 or more, more preferably 0.07 or more, and more preferably 0.08 or more. , more preferably 0.09 or more. Further, from the viewpoint of shortening the total length of the zoom lens at the telephoto end, fpt/ft is more preferably 0.18 or less, more preferably 0.16 or less, and more preferably 0.14 or less. More preferred.

1-3-11. Formula (11)
0.40≦f1/fw≦3.00 (11)
however,
f1: Focal length of lens group G1 fw: Focal length at the wide-angle end when focusing on infinity of the zoom lens

Equation (11) is an equation for appropriately setting the ratio between the focal length of lens group G1 and the focal length at the wide-angle end when the zoom lens is focused at infinity. Specifically, equation (11) is an equation for appropriately setting the focal length of lens group G1 relative to the focal length at the wide-angle end when the zoom lens is focused at infinity. Satisfying equation (11) is preferable from the perspective of realizing a zoom lens with high optical performance while realizing a compact size at the wide-angle end when the zoom lens is focused at infinity.

When f1/fw is less than the lower limit of equation (11), the refractive power of the lens group G1 becomes too large, and it may become difficult to satisfactorily correct field curvature at the wide-angle end. Further, when f1/fw exceeds the upper limit of equation (11), the refractive power of the lens group G1 becomes too small, and it may become difficult to shorten the total optical length at the wide-angle end.

From the viewpoint of satisfactorily correcting field curvature at the wide-angle end, f1/fw is more preferably 0.50 or more, more preferably 0.60 or more, and even more preferably 0.70 or more. It is preferably 0.80 or more, more preferably 0.90 or more. Further, from the viewpoint of shortening the optical total length at the wide-angle end, f1/fw is more preferably 2.70 or less, more preferably 2.40 or less, and even more preferably 2.10 or less. It is preferably 1.90 or less, and more preferably 1.90 or less.

1-3-12. Equation (12)
0.50≦BFw/Yw≦4.50 (12)
BFw: Distance on the optical axis from the lens surface closest to the image plane to the image plane at the wide-angle end when the zoom lens is focused at infinity Yw: Maximum image height at the wide-angle end when the zoom lens is focused at infinity

Equation (12) is an equation for appropriately setting the ratio between the back focus and the maximum image height at the wide-angle end when the zoom lens is focused at infinity. Specifically, Equation (12) is expressed as: This is a formula for appropriately setting the distance on the optical axis from to the image plane. If another optical element is interposed between the lens surface closest to the image plane and the image plane, the optical distance of the other optical element is the air equivalent distance on the optical axis of the optical element. . Examples of the other optical element include a glass flat member having parallel surfaces, a filter, and the like. Examples of the flat glass member include dummy glass and cover glass. It is preferable to satisfy formula (12) from the viewpoint of ensuring a back focus suitable for exchanging zoom lenses at the wide-angle end and from the viewpoint of realizing a compact zoom lens.

If BFw/Yw is below the lower limit of equation (12), the back focus becomes too short, and the inclination angle of the light incident on the image sensor with respect to the optical axis may become too large. To reduce the inclination angle, the exit pupil diameter must be increased, which may make it difficult to reduce the diameter of the lens group located closest to the image plane in the zoom lens. Also, if BFw/Yw is above the upper limit of equation (12), the back focus becomes too long, and it may make it difficult to reduce the size of the zoom lens at the wide-angle end.

From the viewpoint of realizing a small diameter of the lens group located closest to the image surface of the zoom lens, BFw/Yw is more preferably 0.70 or more, more preferably 0.75 or more, more preferably 0.80 or more, more preferably 0.85 or more, and more preferably 0.90 or more. Also, from the viewpoint of realizing a compact zoom lens at the wide-angle end, BFw/Yw is more preferably 4.20 or less, more preferably 3.90 or less, more preferably 3.60 or less, and more preferably 3.30 or less.

1-3-13. Formula (13)
Xp/(-Xn)≦1.0 (13)
however,
Xn: Amount of movement from the wide-angle end to the telephoto end of the lens group with negative refractive power in the composite lens group Gn Xp: Movement amount from the wide-angle end to the telephoto end of the lens group with positive refractive power in the composite lens group Gp amount of movement

The formula (13) is a formula for appropriately setting the ratio of the movement amount of the lens group having a positive refractive power of the composite lens group Gp to the movement amount of the lens group having a negative refractive power of the composite lens group Gn when the magnification is changed from the wide-angle end to the telephoto end. When the composite lens group Gn has a plurality of lens groups having negative refractive power, it is sufficient that one or more lens groups having negative refractive power satisfy the formula (14). When the composite lens group Gp has a plurality of lens groups having positive refractive power, it is sufficient that one or more lens groups having positive refractive power satisfy the formula (13). Here, the sign of each movement amount is positive when the movement toward the object side on the optical axis is changed from the wide-angle end to the telephoto end. It is preferable to satisfy the formula (13) from the viewpoint of making the diameter of the rear group small and realizing the weight reduction of the entire zoom lens.

If Xp/(-Xn) exceeds the upper limit of equation (13), the amount of movement of the lens group having positive refractive power in the composite lens group Gp becomes too large, making it possible to reduce the diameter of the rear group at the telephoto end. This can sometimes be difficult.

From the viewpoint of realizing a smaller diameter of the rear group, Xp/(-Xn) is more preferably 0.90 or less, more preferably 0.80 or less, and even more preferably 0.75 or less. It is preferably 0.70 or less, and more preferably 0.70 or less. The lower limit of Xp/(-Xn) can be determined as appropriate within the range in which the effects of the present invention can be obtained. For example, Xp/(-Xn) is more preferably 0.10 or more, more preferably 0.15 or more, and even more preferably 0.20 or more. If Xp/(-Xn) is below the lower limit, the amount of movement of the lens group having negative refractive power in the composite lens group Gn becomes too large, and the load applied to the member for driving the composite lens group Gn also increases. Sometimes. Therefore, it may be difficult to achieve a good operating feel during zooming.

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 embodiment described above, and an imaging element that is provided on the image plane side of the zoom lens and converts an optical image formed by the zoom lens into an electrical signal.

Here, the imaging element is not limited, and solid-state imaging elements such as CCD (Charge Coupled Device) sensors and CMOS (Complementary Metal Oxide Semiconductor) sensors can be used as the imaging element, and silver halide film can also be used. The imaging device according to this embodiment is suitable for imaging devices using the above-mentioned solid-state imaging elements, such as digital cameras and video cameras. The imaging device may be a fixed-lens imaging device in which the lens is fixed to the housing, or a lens-interchangeable imaging device such as a single-lens reflex camera or a mirrorless single-lens camera. In particular, the zoom lens according to this 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 finder, a phase difference sensor, and a reflex mirror for branching light to these.

FIG. 33 is a diagram schematically showing an example of the configuration of an imaging device according to this embodiment. As shown in FIG. 33, the mirrorless single-lens camera 1 includes a main body 2 and a lens barrel 3 that is detachable from the main body 2. The mirrorless single-lens camera 1 is one embodiment of an imaging device.

The lens barrel 3 has a zoom lens 30. The zoom lens 30 includes a first lens group 31, a second lens group 32, a third lens group 33, a fourth lens group 34, and a fifth lens group 35. The zoom lens 30 is configured to satisfy, for example, the above-mentioned expressions (1) and (2). The first lens group 31 includes a first sub-a group 31a and a first sub-b group 31b. An aperture 36 is disposed within the third lens group 33.

The first lens group 31 has positive refractive power and corresponds to the above-mentioned lens group G1. The second lens group 32 has negative refractive power and corresponds to the above-mentioned composite lens group Gn. The third lens group 33 has positive refractive power and corresponds to the above-mentioned composite lens group Gp. The fourth lens group 34 has negative refractive power and corresponds to the above-mentioned lens group Gf. The fifth lens group 35 has negative refractive power and corresponds to the above-mentioned lens group Gr. The first sub-group a 31a has positive refractive power and corresponds to the above-described sub-group G1a. The first sub-group b 31b has positive refractive power and corresponds to the above-mentioned sub-group G1b. Further, the first lens group 31 and the second lens group 32 correspond to the above-mentioned front group. The third lens group 33, the fourth lens group 34, and the fifth lens group 35 correspond to the aforementioned rear group. The sub-group 33v corresponds to the above-mentioned anti-vibration group Gv.

The main body 2 has a CCD sensor 21 as an image sensor and a cover glass 22. The CCD sensor 21 is disposed in the main body 2 at a position where the optical axis OA of the zoom lens 30 in the lens barrel 3 attached to the main body 2 is the central axis. The main body 2 may have a parallel plate that has no substantial refractive power instead of the cover glass 22.

It is more preferable that the imaging device according to this embodiment has an image processing section that electrically processes the captured image data acquired by the imaging element to change the shape of the captured image, and an image correction data storage section that stores image correction data and an image correction program used to process the captured image data in the image processing section.

When a zoom lens is miniaturized, the shape of a captured image formed on an imaging plane tends to be distorted. At that time, it is preferable to correct distortion in the shape of the captured image. The correction may be performed by, for example, storing distortion correction data for correcting distortion in the shape of the captured image in advance in the image correction data holding unit, and using the distortion correction data held in the image correction data holding unit in the image processing unit. This can be implemented by using According to such an imaging device, the zoom lens can be further downsized, beautiful captured images can be obtained, and the entire imaging device can be downsized.

Furthermore, in the imaging device according to this embodiment, it is preferable that the image correction data holding section holds lateral chromatic aberration correction data in advance. Further, it is preferable that the image processing section corrects the chromatic aberration of magnification of the captured image using the chromatic aberration of magnification correction data held in the image correction data holding section. By correcting chromatic aberration of magnification, that is, chromatic distortion, by the image processing section, it becomes possible to reduce the number of lenses constituting the zoom lens. Therefore, according to such an imaging device, the zoom lens can be further downsized, beautiful captured images can be obtained, and the entire imaging device can be downsized.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the claims. Embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present invention.

As is clear from the above description, according to the above embodiment, the entire system can be easily made smaller and lighter, the overall length at the telephoto end is short, the vibration isolation group is small and lightweight, and various aberrations are suppressed well. A corrected high-performance zoom lens and an imaging device including the zoom lens can be provided.

(summary)
The zoom lens according to aspect 1 of the present invention has, in order from the object side, a front group having a negative refractive power and a rear group having a positive refractive power, and the front group serves as a lens group and a composite lens group. In order from the object side, there is only a lens group G1 having a positive refractive power and a composite lens group Gn having a negative refractive power, and the rear group includes, in order from the object side, a composite lens group Gp having a positive refractive power. , and a lens group Gf having a negative refractive power, the rear group further has a lens group Gr having a negative refractive power closer to the image plane than the lens group Gf, and the composite lens group Gp includes one or more lenses. The composite lens group Gp has a negative refractive power and an anti-vibration group Gv that moves in a direction perpendicular to the optical axis to correct image blur, and the composite lens group Gp has a negative refractive power and an anti-vibration group Gv that moves in a direction perpendicular to the optical axis to correct image blur. At this time, the distance between adjacent lens groups on the optical axis changes, lens group G1 is fixed, and during focusing, lens group Gf moves on the optical axis, and the zoom lens satisfies the following equation.
0.65≦|fv|/fpt≦2.00 (1)
0.60≦Dpvt/Dpt≦0.90 (2)
however,
fv: Focal length of the anti-vibration group Gv fpt: Focal length of the composite lens group Gp at the telephoto end Dpvt: Telephoto distance from the lens surface closest to the object side of the composite lens group Gp to the lens surface closest to the object side of the anti-vibration group Gv Distance on the optical axis at the end Dpt: Distance on the optical axis at the telephoto end between the lens surface closest to the object side of the composite lens group Gp and the lens surface closest to the image plane of the composite lens group Gp

The zoom lens according to aspect 2 of the present invention is the same as in aspect 1, and includes one or more lenses each on the object side of the anti-vibration group Gv and on the image plane side of the anti-vibration group Gv, and in the composite lens group Gp. All the lenses arranged closer to the object side than the anti-vibration group Gv have a positive refractive power as a whole, and all the lenses arranged closer to the image plane than the anti-vibration group Gv in the composite lens group Gp have an overall positive refractive power. A zoom lens having refractive power may also be used.

The zoom lens according to the third aspect of the present invention may be the zoom lens according to the second aspect described above that satisfies the following formula.
0.60≦fp1t/fpt≦1.80 (3)
however,
fp1t: Focal length at the telephoto end of all lenses arranged closer to the object than the anti-vibration group Gv in the composite lens group Gp

A zoom lens according to Aspect 4 of the present invention may be the zoom lens according to any one of Aspects 1 to 3 described above, which satisfies the following formula:
−0.90≦fr/ft≦−0.03 (4)
however,
fr: focal length of lens group Gr ft: focal length at telephoto end of zoom lens when focused at infinity

A zoom lens according to aspect 5 of the present invention is a zoom lens according to any one of aspects 1 to 4 above, in which the lens group Gr moves on the optical axis toward the object side when changing the magnification from the wide-angle end to the telephoto end. There may be.

The zoom lens according to aspect 6 of the present invention may be a zoom lens that satisfies the following formula in any one of aspects 1 to 5 above.
1.01≦βrt/βrw≦1.50 (5)
however,
βrt: Lateral magnification of the lens group Gr at the telephoto end when focused at infinity βrw: Lateral magnification of the lens group Gr at the wide-angle end when focused at infinity

A zoom lens according to Aspect 7 of the present invention may be the zoom lens according to any one of Aspects 1 to 6 above, which satisfies the following formula:
0.35≦Lt/ft≦0.70 (6)
however,
Lt: total optical length at the telephoto end of the zoom lens when focused at infinity ft: focal length at the telephoto end of the zoom lens when focused at infinity

The zoom lens according to aspect 8 of the present invention may be a zoom lens that satisfies the following formula in any one of aspects 1 to 7 above.
5.0≦｜{1-(βft) ² }×(βcrt) ² |≦13.0・・・・・・(7)
however,
βft: Lateral magnification at the telephoto end when lens group Gf is focused at infinity βcrt: Lateral magnification at the telephoto end when all lens groups on the image plane side than lens group Gf are focused at infinity

A zoom lens according to Aspect 9 of the present invention may be a zoom lens according to any one of Aspects 1 to 8, in which lens group G1 has one or more lenses having negative refractive power, and at least one of the lenses having negative refractive power in lens group G1 satisfies the following formula:
−0.012≦ΔPgF1≦−0.001 (8)
however,
ΔPgF1: Anomalous dispersion of the lens having negative refractive power in the lens group G1

A zoom lens according to Aspect 10 of the present invention may be the zoom lens according to any one of Aspects 1 to 9 described above, in which at least one of the lenses having negative refractive power included in the lens group Gr satisfies the following formula:
0.015≦ΔPgFr≦0.050 (9)
however,
ΔPgFr: Anomalous dispersion of the lens having the negative refractive power included in the lens group Gr

The zoom lens according to aspect 11 of the present invention may be a zoom lens that satisfies the following formula in any one of aspects 1 to 10 above.
0.05≦fpt/ft≦0.20 (10)
however,
ft: Focal length at the telephoto end when focusing on infinity of the zoom lens

The zoom lens according to aspect 12 of the present invention may be a zoom lens that satisfies the following formula in any one of aspects 1 to 11 above.
0.40≦f1/fw≦3.00 (11)
however,
f1: Focal length of lens group G1 fw: Focal length at the wide-angle end when focusing on infinity of the zoom lens

An imaging device according to a thirteenth aspect of the present invention includes the zoom lens according to any one of the first to twelfth aspects, and an optical image formed by the zoom lens, which is provided on the image plane side of the zoom lens. It may also include an image sensor that converts the signal into a target signal.

An embodiment of the present invention will be described below. In each table below, the unit of length is "mm" and the unit of angle of view is "°". Moreover, "E+a" indicates "x10 ^a ".

[Example 1]
FIG. 1 is a diagram schematically showing the optical configuration of the zoom lens of Example 1 at the wide-angle end when focusing on infinity. 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, and a third lens group G3 having a positive refractive power. , a fourth lens group G4 having negative refractive power, and a fifth lens group G5 having negative refractive power. The first lens group G1 includes a first sub-a group G1a having a positive refractive power and a first sub-b group G1b having a positive refractive power. The third lens group G3 includes a sub-group Gv having negative refractive power. An aperture stop S is arranged within the third lens group G3. "IP" shown in FIG. 1 is an image plane.

The first lens group G1 includes, in order from the object side, a biconvex lens L1, a cemented lens of a biconvex lens L2 and a biconcave lens L3, and a biconvex lens L4. The first sub-a group G1a is composed of a lens L1. The first sub-b group G1b is composed of a cemented lens of a lens L2 and a lens L3, and a lens L4.

The second lens group G2 includes, in order from the object side, a cemented lens of a biconvex lens L5 and a biconcave lens L6, a biconcave lens L7, and a biconcave lens L8.

The third lens group G3 includes, in order from the object side, a biconvex lens L9, a positive meniscus lens L10 with a convex surface facing the object side, a cemented lens of a biconvex lens L11 and a biconcave lens L12, a biconvex lens L13, and the object side. A three-piece cemented lens consisting of a negative meniscus lens L14 with a convex surface facing toward the object side, a biconvex lens L15, and a biconcave lens L16, a cemented lens with a positive meniscus lens L17 and a biconcave lens L18 with a concave surface facing the object side, and a biconvex lens L19. configured. The cemented lens of lenses L17 and L18 constitutes a sub-group Gv. The sub group Gv is arranged so as to be movable in a direction perpendicular to the optical axis so as to correct image blur.

The fourth lens group G4 is composed of a negative meniscus lens L20 with its convex surface facing the object side.

The fifth lens group G5 is composed of, from the object side, a cemented lens of a biconcave lens L21 and a biconvex lens L22, a cemented lens of a biconvex lens L23 and a biconcave lens L24, and a negative meniscus lens L25 with its concave surface facing the object side. The negative meniscus lens L25 is a composite resin type aspherical lens with a composite resin film molded into an aspherical shape attached to the object side surface.

In the zoom lens of Example 1, the first lens group G1 corresponds to the aforementioned lens group G1. The first sub-group a G1a corresponds to the above-mentioned sub-group G1a, and the first sub-group B G1b corresponds to the above-mentioned sub-group G1b. The second lens group G2 corresponds to the above-mentioned composite lens group Gn. The third lens group G3 corresponds to the above-mentioned composite lens group Gp. The fourth lens group G4 corresponds to the aforementioned lens group Gf. The fifth lens group G5 corresponds to the above-mentioned lens group Gr. The first lens group G1 and the second lens group G2 correspond to the above-mentioned front group. The sub-group Gv corresponds to the above-mentioned anti-vibration group Gv.

The zoom lens of Example 1 performs a magnification change operation by changing the distance on the optical axis between adjacent lens groups. In the figure, the arrows shown under each lens group at the wide-angle end indicate the trajectory of movement of each lens group when moving from the wide-angle end to the telephoto end. When changing magnification from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 moves on the optical axis toward the image plane, and the third lens group G3, the fourth lens group G4, and the fifth lens group G5 move on the optical axis toward the object side. When focusing, the fourth lens group G4 moves on the optical axis.

Next, an example in which specific numerical values of a zoom lens are applied will be described. Table 1 shows surface data of the zoom lens of Example 1.

In the surface data tables for the embodiments of the present invention, "surface number" refers to the order of the lens surface counted from the object side, "r" refers to the radius of curvature of the lens surface, "d" refers to the distance on the optical axis of the lens surface, "nd" refers to the refractive index for the d-line (wavelength λ=587.56 nm), and "νd" refers to the Abbe number for the d-line. In addition, the "S" designation in the surface number indicates that it is an aperture, and the "ASPH" designation indicates that the lens surface is aspheric. Furthermore, the designations "d(7)", "d(14)", etc. in the "d" column indicate that the distance on the optical axis of the lens surface is a variable distance that changes when changing magnification or focusing.

In Table 1, No. 1 to 7 are surface numbers of the first lens group G1; 8 to 14 are surface numbers of the second lens group G2. No. 15 to 33 are surface numbers of the third lens group G3; 22 represents an aperture stop. No. 34 and 35 are surface numbers of the fourth lens group G4; 36 to 44 are surface numbers of the fifth lens group G5. Note that the surface number of the object surface is "0", which is 1 smaller than the minimum value in the table. The surface number of the image plane is 1 larger than the maximum value in the table, and is "45" in this example.

[Table 1]
Surface number rd nd νd
Object plane ∞ d(0)
1 182.4497 10.0000 1.48749 70.44
2 -403.6984 26.6202
3 188.4803 9.3461 1.49700 81.61
4 -223.4841 2.7000 1.83481 42.72
5 262.8225 3.0000
6 242.8417 5.4615 1.49700 81.61
7 -1183.0117 d(7)
8 84.0753 7.2331 1.80610 33.27
9 -128.8885 1.5000 1.48749 70.44
10 62.3275 5.0723
11 -199.9849 1.7000 1.80420 46.50
12 176.6502 3.5867
13 -102.4296 1.5000 1.83481 42.72
14 185.5932 d(14)
15 121.4017 4.1486 1.80518 25.46
16 -454.9999 0.2000
17 43.9537 6.4374 1.49700 81.61
18 383.2534 0.2000
19 43.6627 7.3975 1.49700 81.61
20 -150.4361 1.5000 1.83400 37.34
21 55.9208 8.6104
22 S ∞ 2.5000
23 159.8368 3.3696 1.60562 43.71
24 -127.0059 0.2000
25 52.0010 1.2000 2.00069 25.46
26 19.2714 8.3553 1.51823 58.96
27 -39.5892 1.2000 1.83481 42.72
28 417.8253 2.7578
29 -109.8115 3.0362 1.80610 33.27
30 -40.3853 1.1000 1.63930 44.87
31 74.3588 2.3776
32 46.1051 3.9921 1.80518 25.46
33 -164.7419 d(33)
34 190.4021 1.0000 1.59282 68.62
35 36.1350 d(35)
36 -56.6572 1.1000 1.92286 20.88
37 25.1658 6.9096 1.68893 31.16
38 -32.9514 0.7000
39 90.9865 7.1625 1.75211 25.05
40 -20.6569 1.2000 1.59282 68.62
41 152.7300 4.3386
42 ASPH -33.2505 0.2500 1.53610 41.21
43 -34.1891 1.5000 1.87070 40.73
44 -82.3749 d(44)
Image plane ∞

Table 2 shows the specifications of the zoom lens of Example 1. In this specification table, from the left, the numerical values are shown for the wide-angle end, the intermediate focal length state, and the telephoto end. In this specification table, "f" represents the focal length of the zoom lens when focused at infinity, "FNo." represents the F-number, "ω" represents the half angle of view, and "Y" represents the maximum image height. Also, in the specification table, "d(n)" (n is an integer) represents the variable distance on the optical axis of the zoom lens when changing the magnification.

[Table 2]
Wide-angle end Mid-range Telephoto end
f 184.9819 349.9912 582.1707
F No. 5.1502 5.6457 6.5297
ω 6.5781 3.4710 2.1003
Y 21.6330 21.6330 21.6330
Wide-angle end Mid-range Telephoto end Wide-angle end Mid-range Telephoto end
d(0) ∞ ∞ ∞ 2070.5451 2070.5451 2070.5450
d(7) 8.4054 46.3531 63.0476 8.4054 46.3531 63.0476
d(14) 79.1475 35.7220 1.2000 79.1475 35.7220 1.2000
d(33) 3.0021 5.7207 3.9418 5.9658 16.0325 27.6185
d(35) 29.8255 27.1070 28.8859 26.8619 16.7952 5.2091
d(44) 48.6113 54.0890 71.9167 48.6113 54.0890 71.9167

Table 3 shows the aspheric coefficients of each aspheric surface in the zoom lens of Example 1. The aspheric coefficients in this table are values when each aspheric surface shape is defined by the following formula.
[Formula] z = ch ² / [1 + {1 - (1 + k) c ² h ² } ^1/2 ] + A 4 h ⁴ + A 6 h ⁶ + A 8 ^{h 8} + A ^{10 h 10} + A ^{12 h 12}

In the above formula, "z" is the amount of displacement of the aspheric surface in the optical axis direction from a reference plane perpendicular to the optical axis, "c" is the curvature (1/r), "h" is the height from the optical axis, "k" is the conic coefficient, and "An" (n is an integer) is the n-th order aspheric coefficient. Note that the aspheric coefficient of surface numbers not shown is 0.

[Table 3]
Face number k A4 A6
42 0.0000 5.44991E-06 3.77913E-09
Face number A8 A10 A12
42 1.20134E-11 8.72519E-14 -1.90492E-16

Table 4 shows the focal length of each lens group that constitutes the zoom lens of Example 1.

[Table 4]
Group Number Focal Length
G1 233.0280
G2 -65.3334
G3 60.5168
G4 -75.4136
G5 -218.2960

Further, FIGS. 2, 3, and 4 are diagrams showing longitudinal aberrations of the zoom lens of Example 1 at the wide-angle end, intermediate focal length state, and infinity focus at the telephoto end, respectively. The longitudinal aberrations shown in each figure are spherical aberration (SA (mm)), astigmatism (AST (mm)), and distortion aberration (DIS (%)) in order from the left side as viewed from the drawing. The same applies to other embodiments.

In the diagram showing spherical aberration, the vertical axis is the F number and the horizontal axis is defocus. In the diagram representing spherical aberration, the solid line represents the spherical aberration at the d-line (wavelength λ = 587.56 nm), the broken line represents the spherical aberration at the C-line (wavelength λ = 656.27 nm), and the dashed line represents the spherical aberration at the g-line (wavelength λ = 435.84 nm). show.

In the diagram showing astigmatism, the vertical axis represents the half angle of view, and the horizontal axis represents defocus. In the diagram showing astigmatism, the solid line represents the astigmatism in the sagittal image plane for the d-line (indicated by ds in the diagram), and the dashed line represents the astigmatism in the meridional plane for the d-line (indicated by dm in the diagram).

In the diagram showing distortion aberration, the vertical axis is a half angle of view, and the horizontal axis is a percentage.

[Example 2]
FIG. 5 is a diagram showing the optical configuration of the zoom lens of Example 2 at the wide-angle end when focusing on infinity. FIG. 6, FIG. 7, and FIG. 8 are diagrams showing longitudinal aberrations of the zoom lens of Example 2 at the wide-angle end, the intermediate focal length state, and the telephoto end when focusing on infinity, respectively. The zoom lens of Example 2 is composed 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, a third lens group G3 having negative refractive power, a fourth lens group G4 having positive refractive power, a fifth lens group G5 having negative refractive power, and a sixth lens group G6 having negative refractive power. The first lens group G1 includes a first sub-a group G1a having positive refractive power and a first sub-b group G1b having positive refractive power. The fourth lens group G4 includes a sub-group Gv having negative refractive power. An aperture stop S is arranged in the fourth lens group G4.

The first lens group G1 includes, in order from the object side, a biconvex lens L1, a cemented lens of a biconvex lens L2 and a biconcave lens L3, and a biconvex lens L4. The first sub-a group G1a is composed of a lens L1. The first sub-b group G1b is composed of a cemented lens of a lens L2 and a lens L3, and a lens L4.

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

The third lens group G3 is composed of a biconcave lens L8.

The fourth lens group G4 is composed of, in order from the object side, a biconvex lens L9, a positive meniscus lens L10 with its convex surface facing the object side, a cemented lens of a biconvex lens L11 and a biconcave lens L12, a biconvex lens L13, a triplet cemented lens of a negative meniscus lens L14 with its convex surface facing the object side, a biconvex lens L15 and a biconcave lens L16, a cemented lens of a positive meniscus lens L17 with its concave surface facing the object side and a biconcave lens L18, and a biconvex lens L19. The cemented lens of lenses L17 and L18 constitutes a subgroup Gv. The subgroup Gv is arranged to be movable in a direction perpendicular to the optical axis so as to correct image blur.

The fifth lens group G5 is composed of a negative meniscus lens L20 with its convex surface facing the object side.

The sixth lens group G6 is composed of, from the object side, a cemented lens of a biconcave lens L21 and a biconvex lens L22, a cemented lens of a biconvex lens L23 and a biconcave lens L24, and a negative meniscus lens L25 with its concave surface facing the object side. The negative meniscus lens L25 is a composite resin type aspherical lens with a composite resin film molded into an aspherical shape attached to the object side surface.

In the zoom lens of Example 2, the first lens group G1 corresponds to the aforementioned lens group G1. The first sub-group a G1a corresponds to the above-mentioned sub-group G1a, and the first sub-group B G1b corresponds to the above-mentioned sub-group G1b. The second lens group G2 and the third lens group G3 correspond to the above-mentioned composite lens group Gn. The fourth lens group G4 corresponds to the above-mentioned composite lens group Gp. The fifth lens group G5 corresponds to the above-mentioned lens group Gf. The sixth lens group G6 corresponds to the above-mentioned lens group Gr. The first lens group G1, the second lens group G2, and the third lens group G3 correspond to the above-mentioned front group. The fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 correspond to the aforementioned rear group. The sub-group Gv corresponds to the above-mentioned anti-vibration group.

The zoom lens of Example 2 performs a zooming operation by changing the distance between adjacent lens groups on the optical axis. When changing the magnification from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 and the third lens group G3 move on the optical axis toward the image plane, and the fourth lens group G4, The fifth lens group G5 and the sixth lens group G6 move on the optical axis toward the object side. During focusing, the fifth lens group G5 moves on the optical axis.

Table 5 is a table of surface data for the zoom lens of Example 2. In Table 5, No. 1 to 7 are surface numbers of the first lens group G1, No. 8 to 12 are surface numbers of the second lens group G2, and No. 13 and 14 are surface numbers of the third lens group G3. No. 15 to 33 are surface numbers of the fourth lens group G4, and No. 22 represents the aperture stop. No. 34 and 35 are surface numbers of the fifth lens group G5, and No. 36 to 44 are surface numbers of the sixth lens group G6.

[Table 5]
Surface number rd nd νd
Object plane ∞ d(0)
1 172.3685 10.0000 1.48749 70.44
2 -466.6312 26.9019
3 187.3246 9.2687 1.49700 81.61
4 -230.5965 2.5000 1.83481 42.72
5 246.0023 3.0000
6 190.2720 6.2969 1.49700 81.61
7 -1072.1852 d(7)
8 77.8587 7.3231 1.80610 33.27
9 -142.2214 1.5000 1.48749 70.44
10 63.5272 4.7685
11 -244.1937 1.7000 1.80420 46.50
12 104.9919 d(12)
13 -97.9818 1.5000 1.83481 42.72
14 194.4426 d(14)
15 105.6778 4.1057 1.80518 25.46
16 -659.0602 0.2000
17 44.4203 5.8251 1.49700 81.61
18 334.8743 0.2000
19 46.5822 7.9673 1.49700 81.61
20 -114.8096 1.5000 1.83400 37.34
21 63.6089 6.7379
22 S∞2.5000
23 234.0486 3.3421 1.60562 43.71
24 -102.1570 0.6914
25 53.1148 1.2000 2.00069 25.46
26 19.4680 8.3914 1.51823 58.96
27 -36.8410 1.2000 1.83481 42.72
28 1906.2293 2.6088
29 -119.1446 2.9444 1.80610 33.27
30 -41.8259 1.1000 1.63930 44.87
31 73.0637 2.2178
32 45.2983 3.9688 1.80518 25.46
33 -174.4977 d(33)
34 152.9104 1.0000 1.59282 68.62
35 34.1887 d(35)
36 -37.7950 1.1000 1.92286 20.88
37 26.7942 7.4286 1.68893 31.16
38 -28.1806 0.7000
39 155.7716 7.7609 1.75211 25.05
40 -19.4971 1.2000 1.59282 68.62
41 1515.7308 4.4453
42 ASPH -30.8499 0.2500 1.53610 41.21
43 -32.1437 1.5000 1.87070 40.73
44 -56.9736 d(44)
Image plane ∞

Table 6 shows the specifications of the zoom lens of Example 2. Table 7 shows the aspheric coefficients of each aspheric surface in the zoom lens of Example 2. Table 8 shows the focal lengths of each lens group constituting the zoom lens of Example 2.

[Table 6]
Wide-angle end Intermediate Telephoto end
f 185.0086 350.0125 582.1636
FNo. 5.8014 6.1650 6.5296
ω 6.5999 3.4907 2.1082
Y 21.6330 21.6330 21.6330
Wide-angle end Intermediate Telephoto end Wide-angle end Intermediate Telephoto end
d(0) ∞ ∞ ∞ 2070.5448 2070.5449 2070.5446
d(7) 12.5172 39.4888 56.7686 12.5172 39.4888 56.7686
d(12) 4.6966 5.6756 4.9219 4.6966 5.6756 4.9219
d(14) 74.8686 33.7845 1.2000 74.8686 33.7845 1.2000
d(33) 2.9989 6.4865 4.6940 5.9374 15.8708 27.4934
d(35) 31.6550 28.1675 29.9599 28.7165 18.7832 7.1606
d(44) 45.8745 59.0079 75.0666 45.8745 59.0079 75.0666

[Table 7]
Surface number k A4 A6
42 0.0000 5.33455E-06 7.84308E-09
Surface number A8 A10 A12
42 -2.79958E-11 2.54947E-13 -4.75745E-16

[Table 8]
Group number Focal length
G1 214.6420
G2 -207.4500
G3 -77.8618
G4 57.5179
G5 -74.5122
G6 -258.8370

[Example 3]
FIG. 9 is a diagram schematically showing the optical configuration of the zoom lens of Example 3 at the wide-angle end when focusing on infinity. FIGS. 10, 11, and 12 are diagrams showing longitudinal aberrations of the zoom lens of Example 3 at the wide-angle end, intermediate focal length state, and telephoto end when focusing on infinity. 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 positive refractive power, and a third lens group G3 having a negative refractive power. , a fourth lens group G4 having a positive refractive power, a fifth lens group G5 having a negative refractive power, and a sixth lens group G6 having a negative refractive power. The first lens group G1 includes a first sub-a group G1a having a positive refractive power and a first sub-b group G1b having a positive refractive power. The fourth lens group G4 includes a sub-group Gv having negative refractive power. An aperture stop S is arranged within the fourth lens group G4.

The first lens group G1 includes, in order from the object side, a biconvex lens L1, a cemented lens of a biconvex lens L2 and a biconcave lens L3, and a biconvex lens L4. The first sub-a group G1a is composed of a lens L1. The first sub-b group G1b is composed of a cemented lens of a lens L2 and a lens L3, and a lens L4.

The second lens group G2 is composed of, from the object side, a biconvex lens L5 and a biconcave lens L6.

The third lens group G3 includes, in order from the object side, a negative meniscus lens L7 with a convex surface facing the object side, and a negative meniscus lens L8 with a concave surface facing the object side.

The fourth lens group G4 includes, in order from the object side, a biconvex lens L9, a positive meniscus lens L10 with a convex surface facing the object side, a cemented lens of a biconvex lens L11 and a biconcave lens L12, a biconvex lens L13, and the object side. A three-piece cemented lens consisting of a negative meniscus lens L14 with a convex surface facing toward the object side, a biconvex lens L15, and a biconcave lens L16, a cemented lens with a positive meniscus lens L17 and a biconcave lens L18 with a concave surface facing the object side, and a biconvex lens L19. configured. The cemented lens of lenses L17 and L18 constitutes a sub-group Gv. The sub group Gv is arranged so as to be movable in a direction perpendicular to the optical axis so as to correct image blur.

The fifth lens group G5 is composed of a negative meniscus lens L20 with its convex surface facing the object side.

The sixth lens group G6 includes, in order from the object side, a cemented lens of a biconcave lens L21 and a biconvex lens L22, a cemented lens of a biconvex lens L23 and a biconcave lens L24, and a negative meniscus lens L25 with a concave surface facing the object side. configured. The negative meniscus lens L25 is a composite resin type aspherical lens in which a composite resin film molded into an aspherical shape is attached to the object side surface.

In the zoom lens of Example 3, the first lens group G1 corresponds to the aforementioned lens group G1. The first sub-group a G1a corresponds to the above-mentioned sub-group G1a, and the first sub-group B G1b corresponds to the above-mentioned sub-group G1b. The second lens group G2 and the third lens group G3 correspond to the above-mentioned composite lens group Gn. The fourth lens group G4 corresponds to the above-mentioned composite lens group Gp. The fifth lens group G5 corresponds to the above-mentioned lens group Gf. The sixth lens group G6 corresponds to the above-mentioned lens group Gr. The first lens group G1, the second lens group G2, and the third lens group G3 correspond to the above-mentioned front group. The fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 correspond to the aforementioned rear group. The sub-group Gv corresponds to the above-mentioned anti-vibration group.

The zoom lens of Example 3 performs a magnification change operation by changing the distance on the optical axis between adjacent lens groups. When changing magnification from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 and the third lens group G3 move on the optical axis toward the image surface, and the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 move on the optical axis toward the object side. When focusing, the fifth lens group G5 moves on the optical axis.

Table 9 is a table of surface data for the zoom lens of Example 3. In Table 9, No. 1 to 7 are surface numbers of the first lens group G1, No. 8 to 11 are surface numbers of the second lens group G2, and No. 12 to 15 are surface numbers of the third lens group G3. No. 16 to 34 are surface numbers of the fourth lens group G4, and No. 23 represents the aperture stop. No. 35 and 36 are surface numbers of the fifth lens group G5, and No. 37 to 45 are surface numbers of the sixth lens group G6.

[Table 9]
Surface number rd nd νd
Object plane ∞ d(0)
1 175.2847 10.0000 1.48749 70.44
2 -445.8112 27.1481
3 204.0444 8.6050 1.49700 81.61
4 -233.5655 2.7000 1.83481 42.72
5 280.2832 3.0000
6 187.6493 6.0365 1.49700 81.61
7 -2236.2229 d(7)
8 96.1318 5.5977 1.77047 29.74
9 -349.0675 1.4104
10 -460.7200 1.5000 1.59349 67.00
11 82.5279 d(11)
12 747.7002 1.5000 1.74330 49.22
13 78.8618 5.9572
14 -70.0752 1.5000 1.77250 49.62
15 -2767.1835 d(15)
16 133.5099 3.9572 1.80518 25.46
17 -571.5164 0.2000
18 48.0149 6.6337 1.49700 81.61
19 2953.3024 0.2000
20 47.1234 10.0000 1.49700 81.61
21 -114.8386 1.5000 1.83400 37.34
22 69.3677 3.8799
23 S∞7.6694
24 263.4682 3.1546 1.60562 43.71
25 -110.2858 0.2000
26 55.4420 1.2000 2.00069 25.46
27 19.1999 8.1782 1.51823 58.96
28 -37.1350 1.2000 1.83481 42.72
29 1552.3735 2.6407
30 -108.5796 3.0672 1.80610 33.27
31 -39.6094 1.1000 1.63930 44.87
32 73.8435 2.3655
33 45.4628 4.1159 1.80518 25.46
34 -144.8730 d(34)
35 171.2908 1.0000 1.59282 68.62
36 35.5787 d(36)
37 -35.6989 1.1000 1.92286 20.88
38 31.2562 7.1269 1.68893 31.16
39 -26.6093 0.7000
40 91.5706 7.4959 1.75211 25.05
41 -20.9094 1.2000 1.59282 68.62
42 405.9052 4.2269
43 ASPH -32.8943 0.1500 1.53610 41.21
44 -35.3610 1.5000 1.87070 40.73
45 -96.0677 d(45)
Image plane ∞

Table 10 shows the specifications of the zoom lens of Example 3. Table 11 shows the aspheric coefficients of each aspheric surface in the zoom lens of Example 3. Table 12 shows the focal lengths of each lens group that constitutes the zoom lens of Example 3.

[Table 10]
Wide-angle end Intermediate Telephoto end
f 184.9759 350.0057 582.1347
FNo. 5.1699 5.7007 6.5258
ω 6.5695 3.4726 2.1003
Y 21.6330 21.6330 21.6330
Wide-angle end Intermediate Telephoto end Wide-angle end Intermediate Telephoto end
d(0) ∞ ∞ ∞ 2070.5451 2070.5451 2070.5451
d(7) 6.1221 40.7465 58.0025 6.1221 40.7465 58.0025
d(11) 5.3889 4.7208 3.6164 5.3889 4.7208 3.6164
d(15) 76.2871 34.9116 1.2000 76.2871 34.9116 1.2000
d(34) 3.0029 5.5514 3.7973 5.9848 15.5963 26.9742
d(36) 29.7175 27.1691 28.9231 26.7356 17.1241 5.7462
d(45) 48.2194 55.6386 73.1988 48.2194 55.6386 73.1988

[Table 11]
Surface number k A4 A6
43 0.0000 4.24654E-06 6.80969E-10
Surface number A8 A10 A12
43 2.12552E-11 -8.31897E-15 -1.10171E-16

[Table 12]
Group Number Focal Length
G1 214.6950
G2 480.0070
G3 -50.7792
G4 61.0824
G5 -75.9577
G6 -211.8270

[Example 4]
Fig. 13 is a diagram showing the optical configuration of the zoom lens of Example 4 at the wide-angle end when focusing on infinity. Fig. 14, Fig. 15, and Fig. 16 are diagrams showing longitudinal aberrations of the zoom lens of Example 4 at the wide-angle end, the intermediate focal length state, and the telephoto end when focusing on infinity, respectively. The zoom lens of Example 4 is composed 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, a third lens group G3 having positive refractive power, a fourth lens group G4 having positive refractive power, a fifth lens group G5 having negative refractive power, and a sixth lens group G6 having negative refractive power. The first lens group G1 includes a first sub-a group G1a having positive refractive power and a first sub-b group G1b having negative refractive power. The fourth lens group G4 includes a sub-group Gv having negative refractive power. An aperture diaphragm S is disposed between the third lens group G3 and the fourth lens group G4.

The first lens group G1 is composed of, in order from the object side, a biconvex lens L1, a positive meniscus lens L2 with its convex surface facing the object side, and a cemented lens of a biconvex lens L3 and a biconcave lens L4. The first sub-a group G1a is composed of lens L1. The first sub-b group G1b is composed of a cemented lens of lens L2 and lens L3, and lens L4.

The second lens group G2 includes, in order from the object side, a cemented lens consisting of a positive meniscus lens L5 with a convex surface facing the object side, a negative meniscus lens L6 with a convex surface facing the object side, and a positive meniscus lens with a concave surface facing the object side. It is composed of a cemented lens of a lens L7 and a biconcave lens L8, and a biconcave lens L9.

The third lens group G3 is composed of, in order from the object side, a positive meniscus lens L10 with its convex surface facing the object side, a biconvex lens L11, and a cemented lens of a biconvex lens L12 and a biconcave lens L13.

The fourth lens group G4 is composed of, in order from the object side, a biconvex lens L14, a triplet cemented lens of a negative meniscus lens L15 with its convex surface facing the object side, a biconvex lens L16, and a biconcave lens L17, a cemented lens of a positive meniscus lens L18 with its concave surface facing the object side, and a biconcave lens L19, and a cemented lens of a negative meniscus lens L20 with its convex surface facing the object side, and a biconvex lens L21. The cemented lens of lenses L18 and L19 constitutes a subgroup Gv. Subgroup Gv is arranged to be movable in a direction perpendicular to the optical axis so as to correct image blur. The cemented lens of lenses L20 and L21 has positive refractive power.

The fifth lens group G5 is composed of a cemented lens of a biconvex lens L22 and a biconcave lens L23 in order from the object side.

The sixth lens group G6 includes, in order from the object side, a cemented lens of a negative meniscus lens L24 with a convex surface facing the object side and a biconvex lens L25, a cemented lens of a biconvex lens L26 and a biconcave lens L27, and a cemented lens with a concave surface facing the object side. It is composed of a negative meniscus lens L28 that is directed toward the lens. The negative meniscus lens L28 is a composite resin type aspherical lens in which a composite resin film molded into an aspherical shape is attached to the object side surface.

In the zoom lens of Example 4, the first lens group G1 corresponds to the aforementioned lens group G1. The first sub-group a G1a corresponds to the above-mentioned sub-group G1a, and the first sub-group B G1b corresponds to the above-mentioned sub-group G1b. The second lens group G2 corresponds to the above-mentioned composite lens group Gn. The third lens group G3 and the fourth lens group G4 correspond to the above-mentioned composite lens group Gp. The fifth lens group G5 corresponds to the above-mentioned lens group Gf. The sixth lens group G6 corresponds to the above-mentioned lens group Gr. The first lens group G1 and the second lens group G2 correspond to the above-mentioned front group. The third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 correspond to the aforementioned rear group. The sub-group Gv corresponds to the above-mentioned anti-vibration group.

The zoom lens of Example 4 performs a magnification change operation by changing the distance on the optical axis between adjacent lens groups. When changing magnification from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 moves on the optical axis toward the image surface, and the third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 move on the optical axis toward the object side. When focusing, the fifth lens group G5 moves on the optical axis.

Table 13 is a table of surface data for the zoom lens of Example 4. In Table 13, No. 1 to 7 are surface numbers of the first lens group G1, and No. 8 to 15 are surface numbers of the second lens group G2. No. 16 to 22 are surface numbers of the third lens group G3, No. 23 represents the aperture stop, and No. 24 to 35 are surface numbers of the fourth lens group G4. No. 36 to 38 are surface numbers of the fifth lens group G5, and No. 39 to 47 are surface numbers of the sixth lens group G6.

[Table 13]
Surface number rd nd νd
Object plane ∞ d(0)
1 151.9293 10.6000 1.48749 70.44
2 -519.5684 29.7855
3 162.9951 5.9575 1.49700 81.61
4 1728.8044 0.8809
5 168.1106 8.2820 1.49700 81.61
6 -252.8425 3.0000 1.83481 42.72
7 157.1010 d(7)
8 60.4454 4.2150 1.80000 29.84
9 96.7504 1.7000 1.69680 55.46
10 50.4170 6.5910
11 -1588.5187 4.8519 1.80100 34.97
12 -77.7510 1.5000 1.49700 81.61
13 112.4948 4.6838
14 -80.2541 1.5000 1.83481 42.72
15 464.1728 d(15)
16 101.1685 4.1195 1.60562 43.71
17 2256.2991 0.2000
18 45.0963 7.9170 1.49700 81.61
19 -317.1815 0.2000
20 49.5278 8.2285 1.49700 81.61
21 -99.2343 1.5000 1.87070 40.73
22 88.4540 d(22)
23 S∞5.5275
24 960.0559 4.6327 1.51680 64.20
25 -90.8481 0.2000
26 54.8461 1.2000 1.91082 35.25
27 17.9262 8.8947 1.54814 45.78
28 -28.2645 1.2000 1.83481 42.72
29 330.2866 3.1317
30 -63.7040 3.6264 1.80610 33.27
31 -27.9860 1.1000 1.61772 49.81
32 63.4711 2.4267
33 44.7427 1.2000 1.90366 31.31
34 25.1696 5.6665 1.83400 37.34
35 -110.2890 d(35)
36 502.1105 3.1020 1.63854 55.38
37 -38.0143 1.0000 1.59282 68.62
38 31.3566 d(38)
39 138.3535 1.1000 1.92286 20.88
40 21.3454 7.0000 1.59270 35.31
41 -38.1411 0.2000
42 54.4899 7.1270 1.75520 27.51
43 -20.4237 1.2000 1.69680 55.46
44 41.9476 5.9746
45 ASPH -20.8854 0.2500 1.53610 41.21
46 -23.0668 1.5000 1.91082 35.25
47 -31.8491 d(47)
Image plane ∞

Table 14 shows the specifications of the zoom lens of Example 4. Table 15 shows the aspheric coefficients of each aspheric surface in the zoom lens of Example 4. Table 16 shows the focal length of each lens group constituting the zoom lens of Example 4.

[Table 14]
Wide-angle end Mid-range Telephoto end
f 185.0329 350.1211 582.2405
F No. 5.1476 5.6976 6.5270
ω 6.6359 3.5169 2.1317
Y 21.6330 21.6330 21.6330
Wide-angle end Mid-range Telephoto end Wide-angle end Mid-range Telephoto end
d(0) ∞ ∞ ∞ 2070.5452 2070.5451 2070.5451
d(7) 1.5026 37.1050 55.5806 1.5026 37.1050 55.5806
d(15) 84.4457 37.8434 1.2000 84.4457 37.8434 1.2000
d(22) 4.2766 4.9044 5.8547 4.2766 4.9044 5.8547
d(35) 2.4964 4.3921 2.5016 5.6699 14.1487 24.8465
d(38) 17.9610 18.2330 28.7515 14.7875 8.4764 6.4067
d(47) 45.8001 54.0045 62.5941 45.8001 54.0045 62.5941

[Table 15]
Face number k A4 A6
45 0.0000 2.07917E-05 2.90901E-08
Face number A8 A10 A12
45 1.08256E-10 6.48354E-14 4.34761E-16

[Table 16]
Group number Focal length
G1 259.4720
G2 -71.9529
G3 58.8966
G4 359.9130
G5 -61.1261
G6 -488.0160

[Example 5]
Fig. 17 is a diagram showing the optical configuration of the zoom lens of Example 5 at the wide-angle end when focusing on infinity. Fig. 18, Fig. 19, and Fig. 20 are diagrams showing longitudinal aberrations of the zoom lens of Example 5 at the wide-angle end, the intermediate focal length state, and the telephoto end when focusing on infinity, respectively. The zoom lens of Example 5 is composed 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, a third lens group G3 having positive refractive power, a fourth lens group G4 having negative refractive power, a fifth lens group G5 having negative refractive power, and a sixth lens group G6 having negative refractive power. The first lens group G1 includes a first sub-a group G1a having positive refractive power and a first sub-b group G1b having positive refractive power. The fourth lens group G4 includes a sub-group Gv having negative refractive power. An aperture diaphragm S is disposed between the third lens group G3 and the fourth lens group G4.

The first lens group G1 includes, in order from the object side, a biconvex lens L1, a biconvex lens L2, and a cemented lens of a biconvex lens L3 and a biconcave lens L4. The first sub-a group G1a is composed of a lens L1. The first sub-b group G1b is composed of a cemented lens of a lens L2 and a lens L3, and a lens L4.

The second lens group G2 includes, in order from the object side, a cemented lens consisting of a positive meniscus lens L5 with a convex surface facing the object side, a negative meniscus lens L6 with a convex surface facing the object side, and a positive meniscus lens with a concave surface facing the object side. It is composed of a cemented lens of a lens L7 and a biconcave lens L8, and a negative meniscus lens L9 with a concave surface facing the object side.

The third lens group G3 includes, in order from the object side, a positive meniscus lens L10 with a convex surface facing the object side, a biconvex lens L11, and a cemented lens of a biconvex lens L12 and a biconcave lens L13.

The fourth lens group G4 is a three-piece cemented lens consisting of, in order from the object side, a positive meniscus lens L14 with a concave surface facing the object side, a negative meniscus lens L15 with a convex surface facing the object side, a biconvex lens L16, and a biconcave lens L17. , a cemented lens of a positive meniscus lens L18 with a concave surface facing the object side and a biconcave lens L19, and a cemented lens of a negative meniscus lens L20 with a convex surface facing the object side and a biconvex lens L21. The cemented lens of lenses L18 and L19 constitutes a sub-group Gv. The sub group Gv is arranged so as to be movable in a direction perpendicular to the optical axis so as to correct image blur. The cemented lens of lenses L20 and L21 has positive refractive power.

The fifth lens group G5 is composed of a cemented lens of a biconvex lens L22 and a biconcave lens L23 in order from the object side.

The sixth lens group G6 includes, in order from the object side, a cemented lens of a negative meniscus lens L24 with a convex surface facing the object side and a biconvex lens L25, a cemented lens of a biconvex lens L26 and a biconcave lens L27, and a cemented lens with a concave surface facing the object side. It is composed of a negative meniscus lens L28 that is directed toward the lens. The negative meniscus lens L28 is a composite resin type aspherical lens in which a composite resin film molded into an aspherical shape is attached to the object side surface.

In the zoom lens of Example 5, the first lens group G1 corresponds to the aforementioned lens group G1. The first sub-group a G1a corresponds to the above-mentioned sub-group G1a, and the first sub-group B G1b corresponds to the above-mentioned sub-group G1b. The second lens group G2 corresponds to the above-mentioned composite lens group Gn. The third lens group G3 and the fourth lens group G4 correspond to the above-mentioned composite lens group Gp. The fifth lens group G5 corresponds to the above-mentioned lens group Gf. The sixth lens group G6 corresponds to the above-mentioned lens group Gr. The first lens group G1 and the second lens group G2 correspond to the above-mentioned front group. The third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 correspond to the aforementioned rear group. The sub-group Gv corresponds to the above-mentioned anti-vibration group.

The zoom lens of Example 5 performs a zooming operation by changing the distance between adjacent lens groups on the optical axis. During zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 moves on the optical axis toward the image plane, and the third lens group G3, fourth lens group G4, The fifth lens group G5 and the sixth lens group G6 move on the optical axis toward the object side. During focusing, the fifth lens group G5 moves on the optical axis.

Table 17 is a table of surface data of the zoom lens of Example 5. In Table 17, No. 1 to 7 are surface numbers of the first lens group G1; 8 to 15 are surface numbers of the second lens group G2. No. 16 to 22 are surface numbers of the third lens group G3; 23 represents an aperture stop, and No. 24 to 35 are surface numbers of the fourth lens group G4. No. 36 to 38 are surface numbers of the fifth lens group G5, and No. 39 to 47 are surface numbers of the sixth lens group G6.

[Table 17]
Surface number rd nd νd
Object plane ∞ d(0)
1 169.8414 9.3235 1.48749 70.44
2 -728.1200 29.8699
3 150.3164 7.4299 1.49700 81.61
4 -1745.9586 0.2000
5 135.3383 8.8694 1.49700 81.61
6 -337.6166 3.0000 1.83481 42.72
7 135.5884 d(7)
8 63.9526 4.4632 1.80000 29.84
9 126.3700 1.7000 1.69680 55.46
10 48.3366 7.0467
11 -346.7227 4.5108 1.80100 34.97
12 -70.9343 1.5000 1.49700 81.61
13 128.1954 4.5956
14 -72.9113 1.5000 1.83481 42.72
15 -1506.6855 d(15)
16 91.0862 4.0894 1.60562 43.71
17 543.6365 0.2000
18 45.0435 7.9770 1.49700 81.61
19 -346.0660 0.2000
20 59.7389 7.4199 1.49700 81.61
21 -80.3697 1.5000 1.87070 40.73
22 239.4883 d(22)
23 S∞ 4.2707
24 -137.9289 4.0000 1.51680 64.20
25 -62.4885 0.2000
26 73.3823 1.2000 1.91082 35.25
27 19.4027 9.9310 1.54814 45.78
28 -24.9260 1.2000 1.83481 42.72
29 -1571.8078 2.9252
30 -64.4921 4.0000 1.80610 33.27
31 -28.8427 1.1000 1.61772 49.81
32 71.0222 2.4245
33 49.5594 1.2000 1.90366 31.31
34 24.6809 6.0948 1.83400 37.34
35 -107.1472 d(35)
36 560.7871 2.9173 1.63854 55.38
37 -44.4733 1.0000 1.59282 68.62
38 34.8639 d(38)
39 195.8798 1.1000 1.92286 20.88
40 22.5257 7.0000 1.59270 35.31
41 -35.8613 0.2000
42 53.3051 7.1677 1.75520 27.51
43 -20.3159 1.2000 1.69680 55.46
44 41.7380 6.4244
45 ASPH -19.2985 0.2500 1.53610 41.21
46 -21.2634 1.5000 1.91082 35.25
47 -29.7573 d(47)
Image plane ∞

Table 18 shows the specifications of the zoom lens of Example 5. Table 19 shows the aspheric coefficients of each aspheric surface in the zoom lens of Example 5. Table 20 shows the focal length of each lens group constituting the zoom lens of Example 5.

[Table 18]
Wide-angle end Intermediate Telephoto end
f 185.0226 350.1384 582.2199
FNo. 5.1403 5.8832 6.5262
ω 6.6158 3.5115 2.1258
Y 21.6330 21.6330 21.6330
Wide-angle end Intermediate Telephoto end Wide-angle end Intermediate Telephoto end
d(0) ∞ ∞ ∞ 2070.5452 2070.5451 2070.5451
d(7) 3.6762 36.2957 55.3864 3.6762 36.2957 55.3864
d(15) 79.6736 36.0542 1.2000 79.6736 36.0542 1.2000
d(22) 4.7994 5.3564 6.2254 4.7994 5.3564 6.2254
d(35) 5.9404 7.3235 2.5023 9.5232 18.2514 27.2994
d(38) 19.4938 19.9576 30.4030 15.9110 9.0297 5.6059
d(47) 43.1703 51.7665 61.0368 43.1703 51.7665 61.0368

[Table 19]
Surface number k A4 A6
45 0.0000 2.18261E-05 2.25336E-08
Surface number A8 A10 A12
45 2.56953E-10 -8.42204E-13 2.76395E-15

[Table 20]
Group Number Focal Length
G1 236.3170
G2 -67.4597
G3 53.2018
G4 -2856.5300
G5 -67.6503
G6 -338.2150

[Example 6]
FIG. 21 is a diagram showing the optical configuration of the zoom lens of Example 6 at the wide-angle end when focusing on infinity. FIG. 22, FIG. 23, and FIG. 24 are diagrams showing longitudinal aberrations of the zoom lens of Example 6 at the wide-angle end, the intermediate focal length state, and the telephoto end when focusing on infinity, respectively. The zoom lens of Example 6 is composed 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, a third lens group G3 having positive refractive power, a fourth lens group G4 having negative refractive power, and a fifth lens group G5 having negative refractive power. The first lens group G1 includes a first sub-a group G1a having positive refractive power and a first sub-b group G1b having positive refractive power. The third lens group G3 includes a sub-group Gv having negative refractive power. An aperture stop S is arranged in the third lens group G3.

The first lens group G1 is composed of, in order from the object side, a biconvex lens L1, a biconvex lens L2, and a cemented lens of a biconvex lens L3 and a biconcave lens L4. The first sub-a group G1a is composed of lens L1. The first sub-b group G1b is composed of a cemented lens of lens L2 and lens L3, and lens L4.

The second lens group G2 is composed of, in order from the object side, a cemented lens of a biconvex lens L5 and a biconcave lens L6, a cemented lens of a positive meniscus lens L7 with its concave surface facing the object side and a biconcave lens L8, and a biconcave lens L9.

The third lens group G3 is composed of, in order from the object side, a positive meniscus lens L10 with a convex surface facing the object side, a biconvex lens L11, a cemented lens of a biconvex lens L12 and a biconcave lens L13, a positive meniscus lens L14 with a concave surface facing the object side, a triplet cemented lens of a negative meniscus lens L15 with a convex surface facing the object side, a biconvex lens L16 and a biconcave lens L17, a cemented lens of a positive meniscus lens L18 with a concave surface facing the object side and a biconcave lens L19, and a cemented lens of a negative meniscus lens L20 with a convex surface facing the object side and a biconvex lens L21. The cemented lens of the lenses L18 and L19 constitutes a subgroup Gv. The subgroup Gv is arranged to be movable in a direction perpendicular to the optical axis so as to correct image blur. The cemented lens of the lenses L20 and L21 has positive refractive power.

The fourth lens group G4 is composed of, in order from the object side, a cemented lens consisting of a positive meniscus lens L22 with its concave surface facing and a biconcave lens L23.

The fifth lens group G5 includes, in order from the object side, a cemented lens of a negative meniscus lens L24 with a convex surface facing the object side and a biconvex lens L25, a cemented lens of a biconvex lens L26 and a biconcave lens L27, and a cemented lens with a concave surface facing the object side. It is composed of a negative meniscus lens L28 that is directed toward the lens. The negative meniscus lens L28 is a composite resin type aspherical lens in which a composite resin film molded into an aspherical shape is attached to the object side surface.

In the zoom lens of Example 6, the first lens group G1 corresponds to the aforementioned lens group G1. The first sub-group a G1a corresponds to the above-mentioned sub-group G1a, and the first sub-group B G1b corresponds to the above-mentioned sub-group G1b. The second lens group G2 corresponds to the above-mentioned composite lens group Gn. The third lens group G3 corresponds to the above-mentioned composite lens group Gp. The fourth lens group G4 corresponds to the aforementioned lens group Gf. The fifth lens group G5 corresponds to the above-mentioned lens group Gr. The first lens group G1 and the second lens group G2 correspond to the above-mentioned front group. The third lens group G3, the fourth lens group G4, and the fifth lens group G5 correspond to the aforementioned rear group. The sub-group Gv corresponds to the above-mentioned anti-vibration group.

The zoom lens of Example 6 performs a zooming operation by changing the distance between adjacent lens groups on the optical axis. During zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 moves on the optical axis toward the image plane, and the third lens group G3, fourth lens group G4, And the fifth lens group G5 moves on the optical axis toward the object side. During focusing, the fourth lens group G4 moves on the optical axis.

Table 21 is a table of surface data for the zoom lens of Example 6. In Table 21, No. 1 to 7 are surface numbers for the first lens group G1, No. 8 to 15 are surface numbers for the second lens group G2, No. 16 to 35 are surface numbers for the third lens group G3, and No. 23 represents the aperture stop. No. 36 to 38 are surface numbers for the fourth lens group G4, and No. 39 to 47 are surface numbers for the fifth lens group G5.

Table 21.
Surface number rd nd νd
Object plane ∞ d(0)
1 206.9045 8.7203 1.48749 70.44
2 -535.7473 49.6554
3 124.6420 8.4061 1.49700 81.61
4 -572.0663 0.2000
5 250.4086 7.1255 1.49700 81.61
6 -207.4291 3.0000 1.83481 42.72
7 178.6123 d(7)
8 156.0998 4.1415 1.80518 25.46
9 -713.0123 1.7000 1.69680 55.46
10 137.8420 3.6952
11 -511.1605 4.5915 1.80610 40.73
12 -76.4395 1.5000 1.49700 81.61
13 96.9725 4.9580
14 -78.7377 1.5000 1.83481 42.72
15 413.3270 d(15)
16 63.4940 5.0068 1.61772 49.81
17 405.0584 0.2000
18 43.3956 7.4658 1.49700 81.61
19 -457.8945 0.2001
20 49.6109 7.5057 1.49700 81.61
21 -76.6056 1.5000 1.87070 40.73
22 67.9152 3.9825
23 S∞5.3226
24 -255.0218 3.1532 1.58144 40.89
25 -62.0218 0.2000
26 40.7876 1.2000 1.91082 35.25
27 16.6997 9.3235 1.54814 45.78
28 -28.8101 1.2000 1.83481 42.72
29 152.4120 3.2844
30 -65.0436 3.0216 1.80610 33.27
31 -29.8757 1.1000 1.61772 49.81
32 65.8664 2.2965
33 40.1756 1.2000 1.90366 31.31
34 22.0992 5.4990 1.83400 37.34
35 -148.2010 d(35)
36 -336.2279 3.2525 1.63854 55.38
37 -27.2907 1.0000 1.59282 68.62
38 31.3797 d(38)
39 66.2174 1.1000 1.92286 20.88
40 17.5849 7.0000 1.59270 35.31
41 -41.9820 0.2000
42 58.1086 6.6061 1.75520 27.51
43 -18.2576 1.2000 1.69680 55.46
44 31.5289 5.7900
45 ASPH -19.5266 0.2500 1.53610 41.21
46 -21.2103 1.5000 1.91082 35.25
47 -26.0109 d(47)
Image plane ∞

Table 22 shows a specification table of the zoom lens of Example 6. Table 23 is a table showing aspherical coefficients of each aspherical surface in the zoom lens of Example 6. Table 24 shows the focal length of each lens group constituting the zoom lens of Example 6.

[Table 22]
Wide-angle end Intermediate Telephoto end
f 185.0391 350.1077 582.1701
FNo. 5.1488 5.6978 6.5262
ω 6.5076 3.4492 2.0941
Y 21.6330 21.6330 21.6330
Wide-angle end Intermediate Telephoto end Wide-angle end Intermediate Telephoto end
d(0) ∞ ∞ ∞ 2070.5451 2070.5451 2070.5450
d(7) 1.5000 34.1201 50.6036 1.5000 34.1201 50.6036
d(15) 79.2208 35.6007 1.2000 79.2208 35.6007 1.2000
d(35) 2.4965 4.0168 2.5028 5.3012 12.4700 20.9922
d(38) 11.9366 15.3445 23.6215 9.1319 6.8913 5.1322
d(47) 44.5468 50.6186 61.7729 44.5468 50.6186 61.7729

[Table 23]
Face number k A4 A6
45 0.0000 2.14515E-05 4.16103E-08
Face number A8 A10 A12
45 3.58278E-10 -7.60201E-13 7.58936E-15

Table 24.
Group Number Focal Length
G1 240.8510
G2 -67.5018
G3 60.0454
G4 -52.1282
G5 -456.0090

[Example 7]
FIG. 25 is a diagram schematically showing the optical configuration of the zoom lens of Example 7 at the wide-angle end when focusing on infinity. 26, 27, and 28 are diagrams showing the longitudinal aberration of the zoom lens of Example 7 at the wide-angle end, intermediate focal length state, and telephoto end when focusing at infinity, respectively. The zoom lens of Example 7 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, and a third lens group G3 having a positive refractive power. , a fourth lens group G4 having negative refractive power, and a fifth lens group G5 having negative refractive power. The first lens group G1 includes a first sub-a group G1a having a positive refractive power and a first sub-b group G1b having a positive refractive power. The third lens group G3 includes a sub-group Gv having negative refractive power. An aperture stop S is arranged within the third lens group G3.

The first lens group G1 includes, in order from the object side, a biconvex lens L1, a cemented lens of a biconvex lens L2 and a biconcave lens L3, and a positive meniscus lens L4 with a convex surface facing the object side. The first sub-a group G1a is composed of a lens L1. The first sub-group b G1b is composed of a cemented lens of a lens L2 and a lens L3, and a lens L4.

The second lens group G2 is composed of, from the object side, a cemented lens of a biconvex lens L5 and a biconcave lens L6, a biconcave lens L7, and a biconcave lens L8.

The third lens group G3 includes, in order from the object side, a biconvex lens L9, a positive meniscus lens L10 with a convex surface facing the object side, a cemented lens of a biconvex lens L11 and a biconcave lens L12, a biconvex lens L13, and a biconvex lens L13 on the object side. A three-piece cemented lens consisting of a negative meniscus lens L14 with a convex surface facing, a biconvex lens L15, a negative meniscus lens L16 with a concave surface facing the object side, and a cemented positive meniscus lens L17 with a concave surface facing the object side and a biconcave lens L18. It is composed of a lens and a biconvex lens L19. The cemented lens of lenses L17 and L18 constitutes a sub-group Gv. The sub group Gv is arranged so as to be movable in a direction perpendicular to the optical axis so as to correct image blur.

The fourth lens group G4 is composed of a negative meniscus lens L20 with a convex surface facing the object side.

The fifth lens group G5 is composed of, from the object side, a cemented lens of a biconcave lens L21 and a biconvex lens L22, a cemented lens of a biconvex lens L23 and a biconcave lens L24, and a negative meniscus lens L25 with its concave surface facing the object side. The negative meniscus lens L25 is a composite resin type aspherical lens with a composite resin film molded into an aspherical shape attached to the object side surface.

In the zoom lens of Example 7, the first lens group G1 corresponds to the aforementioned lens group G1. The first sub-group a G1a corresponds to the above-mentioned sub-group G1a, and the first sub-group B G1b corresponds to the above-mentioned sub-group G1b. The second lens group G2 corresponds to the above-mentioned composite lens group Gn. The third lens group G3 corresponds to the above-mentioned composite lens group Gp. The fourth lens group G4 corresponds to the aforementioned lens group Gf. The fifth lens group G5 corresponds to the above-mentioned lens group Gr. The first lens group G1 and the second lens group G2 correspond to the above-mentioned front group. The third lens group G3, the fourth lens group G4, and the fifth lens group G5 correspond to the aforementioned rear group. The sub-group Gv corresponds to the above-mentioned anti-vibration group.

The zoom lens of Example 7 performs a magnification change operation by changing the distance on the optical axis between adjacent lens groups. When changing magnification from the wide-angle end to the telephoto end, the second lens group G2 moves on the optical axis toward the image surface, and the first lens group G1, the third lens group G3, the fourth lens group G4, and the fifth lens group G5 move on the optical axis toward the object side. When focusing, the fourth lens group G4 moves on the optical axis.

Table 25 is a table of surface data of the zoom lens of Example 7. In Table 25, No. 1 to 7 are surface numbers of the first lens group G1; 8 to 14 are surface numbers of the second lens group G2. No. 15 to 33 are surface numbers of the third lens group G3; 22 represents an aperture stop. No. 34 and 35 are surface numbers of the fourth lens group G4. No. 36 to 44 are surface numbers of the fifth lens group G5.

[Table 25]
Surface number rd nd νd
Object plane ∞ d(0)
1 172.3802 10.0000 1.48749 70.44
2 -466.0819 26.4680
3 169.8051 9.2897 1.49700 81.61
4 -263.4463 2.5000 1.83481 42.72
5 226.0306 3.0000
6 180.5266 5.8396 1.49700 81.61
7 49261.6741 d(7)
8 82.5925 7.1450 1.80610 33.27
9 -135.3569 1.5000 1.48749 70.44
10 61.2463 4.5401
11 -410.1487 1.7000 1.80420 46.50
12 141.4302 3.9575
13 -94.4441 1.5000 1.83481 42.72
14 141.7533 d(14)
15 127.1737 3.9110 1.80518 25.46
16 -374.1390 0.2000
17 48.9558 5.7404 1.49700 81.61
18 1105.3240 0.2000
19 44.0541 7.9860 1.49700 81.61
20 -116.7261 1.5000 1.83400 37.34
21 63.0332 3.9536
22 S ∞ 9.4153
23 393.3859 3.2093 1.60562 43.71
24 -86.2503 0.2319
25 62.1900 1.2000 2.00069 25.46
26 20.5654 7.9590 1.51823 58.96
27 -34.5551 1.2000 1.83481 42.72
28 -413.5774 2.3360
29 -130.1270 3.0678 1.80610 33.27
30 -40.6450 1.1000 1.63930 44.87
31 64.9719 2.3553
32 44.8910 4.5000 1.80518 25.46
33 -194.2508 d(33)
34 126.1060 1.0000 1.59282 68.62
35 31.5877 d(35)
36 -73.0143 1.1000 1.92286 20.88
37 25.5204 7.5632 1.68893 31.16
38 -37.0338 0.7000
39 82.9678 7.9111 1.75211 25.05
40 -22.7677 1.2000 1.59282 68.62
41 87.6639 5.6099
42 ASPH -30.6150 0.2500 1.53610 41.21
43 -33.0113 1.5000 1.87070 40.73
44 -59.9951 d(44)
Image plane ∞

Table 26 shows the specifications of the zoom lens of Example 7. Table 27 shows the aspheric coefficients of each aspheric surface in the zoom lens of Example 7. Table 28 shows the focal length of each lens group constituting the zoom lens of Example 7.

[Table 26]
Wide-angle end Intermediate Telephoto end
f 184.9891 350.0115 582.1094
FNo. 5.8025 6.1007 6.5255
ω 6.6295 3.5092 2.1242
Y 21.6330 21.6330 21.6330
Wide-angle end Intermediate Telephoto end Wide-angle end Intermediate Telephoto end
d(0) ∞ ∞ ∞ 2100.5451 2087.7170 2072.8528
d(7) 1.5000 37.4228 59.2326 1.5000 37.4228 59.2326
d(14) 58.2807 25.1860 1.2000 58.2807 25.1860 1.2000
d(33) 7.9909 10.7393 3.0058 11.4266 21.7301 25.4774
d(35) 30.7812 19.2814 29.2251 27.3455 8.2906 6.7535
d(44) 36.5625 55.3140 70.1441 36.5625 55.3140 70.1441

[Table 27]
Surface number k A4 A6
42 0.0000 7.87716E-06 -1.01553E-09
Surface number A8 A10 A12
42 8.18662E-11 -2.73250E-13 5.01859E-16

[Table 28]
Group number Focal length
G1 220.1850
G2 -60.7037
G3 59.2832
G4 -71.3715
G5 -255.4510

[Example 8]
Fig. 29 is a diagram showing the optical configuration of the zoom lens of Example 8 at the wide-angle end when focusing on infinity. Figs. 30, 31, and 32 are diagrams showing longitudinal aberrations of the zoom lens of Example 8 at the wide-angle end, the intermediate focal length state, and the telephoto end when focusing on infinity, respectively. The zoom lens of Example 8 is composed 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, a third lens group G3 having positive refractive power, a fourth lens group G4 having negative refractive power, a fifth lens group G5 having negative refractive power, and a sixth lens group G6 having positive refractive power. The first lens group G1 includes a first sub-a group G1a having positive refractive power and a first sub-b group G1b having positive refractive power. The third lens group G3 includes a sub-group Gv having negative refractive power. An aperture stop S is arranged in the third lens group G3.

The first lens group G1 includes, in order from the object side, a biconvex lens L1, a biconvex lens L2, and a cemented lens of a biconvex lens L3 and a biconcave lens L4. The first sub-a group G1a is composed of a lens L1. The first sub-b group G1b is composed of a cemented lens of a lens L2 and a lens L3, and a lens L4.

The second lens group G2 includes, in order from the object side, a cemented lens consisting of a positive meniscus lens L5 with a convex surface facing the object side, a negative meniscus lens L6 with a convex surface facing the object side, and a positive meniscus lens with a concave surface facing the object side. It is composed of a cemented lens of a lens L7 and a biconcave lens L8, and a biconcave lens L9.

The third lens group G3 includes, in order from the object side, a biconvex lens L10, a biconvex lens L11, a cemented lens of a biconvex lens L12 and a biconcave lens L13, a biconvex lens L14, and a negative meniscus lens with a convex surface facing the object side. A three-piece cemented lens of L15, a biconvex lens L16, and a biconcave lens L17, a cemented lens of a positive meniscus lens L18 and a biconcave lens L19 with a concave surface facing the object side, and a negative meniscus lens L20 with a convex surface facing the object side. It is composed of a cemented lens with a biconvex lens L21. The cemented lens of lenses L18 and L19 constitutes a sub-group Gv. The sub group Gv is arranged so as to be movable in a direction perpendicular to the optical axis so as to correct image blur. The cemented lens of lenses L20 and L21 has positive refractive power.

The fourth lens group G4 is composed of, in order from the object side, a cemented lens consisting of a positive meniscus lens L22 with its concave surface facing and a biconcave lens L23.

The fifth lens group G5 is composed of, in order from the object side, a cemented lens of a negative meniscus lens L24 with its convex surface facing the object side and a biconvex lens L25, a cemented lens of a biconvex lens L26 and a biconcave lens L27, and a negative meniscus lens L28 with its concave surface facing the object side. The negative meniscus lens L28 is a composite resin type aspherical lens with a composite resin film molded into an aspherical shape attached to the object side surface.

The sixth lens group G6 is composed of a biconvex lens L29.

In the zoom lens of Example 8, the first lens group G1 corresponds to the lens group G1 described above. The first sub-a group G1a corresponds to the sub-group G1a described above, and the first sub-b group G1b corresponds to the sub-group G1b described above. The second lens group G2 corresponds to the composite lens group Gn described above. The third lens group G3 corresponds to the composite lens group Gp described above. The fourth lens group G4 corresponds to the lens group Gf described above. The fifth lens group G5 corresponds to the lens group Gr described above. The first lens group G1 and the second lens group G2 correspond to the front group described above. The third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 correspond to the rear group described above. The sub group Gv corresponds to the vibration isolation group described above.

The zoom lens of Example 8 performs a magnification change operation by changing the distance on the optical axis between adjacent lens groups. When changing magnification from the wide-angle end to the telephoto end, the first lens group G1 and the sixth lens group are fixed, the second lens group G2 moves on the optical axis toward the image surface, and the third lens group G3, the fourth lens group G4, and the fifth lens group G5 move on the optical axis toward the object side. When focusing, the fourth lens group G4 moves on the optical axis.

Table 29 is a table of surface data for the zoom lens of Example 8. In Table 29, No. 1 to 7 are surface numbers of the first lens group G1, No. 8 to 15 are surface numbers of the second lens group G2, No. 16 to 35 are surface numbers of the third lens group G3, and No. 23 represents the aperture stop. No. 36 to 38 are surface numbers of the fourth lens group G4, No. 39 to 47 are surface numbers of the fifth lens group G5, and No. 48 and 49 are surface numbers of the sixth lens group G6.

Table 29.
Surface number rd nd νd
Object plane ∞ d(0)
1 167.0051 9.7717 1.48749 70.44
2 -581.8001 34.0529
3 148.0607 7.1345 1.49700 81.61
4 -1998.0634 0.2000
5 174.2255 8.0845 1.49700 81.61
6 -256.0406 3.0000 1.83481 42.72
7 155.6926 d(7)
8 75.6673 4.6247 1.80000 29.84
9 199.9490 1.7000 1.69680 55.46
10 60.4735 6.2405
11 -345.8231 4.4881 1.80100 34.97
12 -74.2304 1.5000 1.49700 81.61
13 132.9156 4.4201
14 -81.6451 1.5000 1.83481 42.72
15 718.4249 d(15)
16 167.0711 3.5462 1.60562 43.71
17 -668.6218 0.2000
18 50.3092 7.7533 1.49700 81.61
19 -173.3638 0.5194
20 48.5962 8.6061 1.49700 81.61
21 -80.9143 1.5000 1.87070 40.73
22 105.0696 7.2411
23 S∞7.2229
24 2060.6500 4.0000 1.58144 40.75
25 -85.3052 0.2000
26 49.3627 1.2030 1.91082 35.25
27 17.6896 8.3492 1.54072 47.23
28 -32.2886 1.2000 1.83481 42.72
29 109.3314 3.3144
30 -72.6032 3.0427 1.80610 33.27
31 -31.7214 1.1000 1.61772 49.81
32 72.3530 2.2001
33 45.2497 1.2000 1.90366 31.31
34 27.7950 5.0000 1.83400 37.34
35 -109.1425 d(35)
36 -2448.6513 3.1258 1.63854 55.38
37 -31.9909 1.0000 1.59282 68.62
38 32.0214 d(38)
39 70.0871 1.1000 1.92286 20.88
40 20.0006 7.0000 1.59270 35.31
41 -58.4669 0.2000
42 35.5361 6.8580 1.75520 27.51
43 -27.4922 1.2000 1.69680 55.46
44 24.6912 6.1109
45 ASPH -33.6516 0.1500 1.53610 41.21
46 -47.0817 1.5000 1.83481 42.72
47 -178.1352 d(47)
48 156.1964 5.2414 1.51680 64.20
49 -83.7431 d(49)
Image plane ∞

Table 30 shows the specifications of the zoom lens of Example 8. Table 31 shows the aspheric coefficients of each aspheric surface in the zoom lens of Example 8. Table 32 shows the focal length of each lens group constituting the zoom lens of Example 8.

[Table 30]
Wide-angle end Mid-range Telephoto end
f 185.0202 350.0371 582.2048
F No. 5.1485 5.6965 6.5266
ω 6.5165 3.4560 2.0986
Y 21.6330 21.6330 21.6330
Wide-angle end Mid-range Telephoto end Wide-angle end Mid-range Telephoto end
d(0) ∞ ∞ ∞ 2070.5452 2070.5451 2070.5452
d(7) 5.3690 38.3171 52.9577 5.3690 38.3171 52.9577
d(15) 80.4177 36.4695 1.2000 80.4177 36.4695 1.2000
d(35) 2.4976 4.2781 3.6043 5.9892 14.5841 25.3710
d(38) 19.2638 18.5798 28.0910 15.7722 8.2737 6.3243
d(47) 4.8505 14.7541 26.5456 4.8505 14.7541 26.5456
d(49) 29.4548 29.4548 29.4548 29.4548 29.4548 29.4548

[Table 31]
Surface number k A4 A6
45 0.0000 1.53321E-05 3.36775E-08
Surface number A8 A10 A12
45 -4.71209E-11 1.01485E-12 -1.13213E-15

[Table 32]
Group number Focal length
G1 245.7150
G2 -70.4455
G3 65.0983
G4 -57.6700
G5 -110.0000
G6 106.2780

Table 33 shows the values calculated by the above-mentioned formulas in Examples 1 to 8 and the numerical values used in the formulas.

Table 33.
Example 1 Example 2 Example 3 Example 4
Equation (1) |fv|/fpt 1.391 1.499 1.371 0.978
Equation (2) Dpvt/Dpt 0.821 0.820 0.826 0.790
Equation (3) fp1t/fpt 1.180 1.187 1.169 1.086
Equation (4) fr/ft -0.375 -0.445 -0.364 -0.838
Equation (5) βrt/βrw 1.084 1.086 1.090 1.035
Equation (6) Lt/ft 0.566 0.566 0.566 0.566
Equation (7) |{1-(βft) ² }×(βcrt) ² | 7.459 7.745 7.565 7.690
Equation (8) ΔPgF1 -0.0067 -0.0067 -0.0067 -0.0067
Equation (9) ΔPgFr 0.0283 0.0283 0.0283 0.0283
Equation (10) fpt/ft 0.104 0.099 0.105 0.111
Equation (11) f1/fw 1.260 1.160 1.161 1.402
Equation (12) BFw/Yw 2.247 2.121 2.229 2.117
Equation (13) Xp/(-Xn) 0.427 0.660 0.481 0.539
Example 5 Example 6 Example 7 Example 8
Equation (1) |fv|/fpt 1.032 1.070 1.405 1.115
Equation (2) Dpvt/Dpt 0.776 0.791 0.816 0.814
Equation (3) fp1t/fpt 1.088 1.098 1.144 1.126
Equation (4) fr/ft -0.581 -0.783 -0.439 -0.189
Equation (5) βrt/βrw 1.051 1.038 1.113 1.150
Equation (6) Lt/ft 0.566 0.566 0.562 0.566
Equation (7) |{1-(βft) ² }×(βcrt) ² | 7.062 9.124 7.765 7.892
Equation (8) ΔPgF1 -0.0067 -0.0067 -0.0067 -0.0067
Equation (9) ΔPgFr 0.0283 0.0283 0.0283 0.0283
Equation (10) fpt/ft 0.113 0.103 0.102 0.112
Equation (11) f1/fw 1.277 1.302 1.190 1.328
Equation (12) BFw/Yw 1.996 2.059 1.690 1.362
Equation (13) Xp/(-Xn) 0.518 0.589 0.900 0.665
Example 1 Example 2 Example 3 Example 4
BFw 48.611 45.875 48.219 45.800
f1 233.028 214.642 214.695 259.472
fr -218.296 -258.837 -211.827 -488.016
βrt 1.371 1.418 1.424 1.027
βrw 1.265 1.305 1.307 0.992
fv -84.165 -86.235 -83.718 -63.414
fpt 60.517 57.518 61.082 64.843
Lt 329.455 329.455 329.455 329.455
βft 2.229 2.203 2.175 2.880
βcrt 1.371 1.418 1.424 1.027
Xp 23.305 29.192 24.979 29.168
Xn -54.642 -44.251 -51.880 -54.078
Dpvt 48.077 46.470 50.614 52.806
Dpt 58.583 56.701 61.262 66.826
fp1t 71.391 68.287 71.378 70.392
Example 5 Example 6 Example 7 Example 8
BFw 43.170 44.547 36.563 29.455
f1 236.317 240.851 220.185 245.715
fr -338.215 -456.009 -255.451 -110.000
βrt 1.080 1.039 1.295 1.503
βrw 1.027 1.002 1.163 1.307
fv -67.752 -64.235 -83.303 -72.570
fpt 65.626 60.045 59.283 65.098
Lt 329.455 329.455 327.147 329.455
βft 2.657 3.074 2.373 2.809
βcrt 1.080 1.039 1.295 1.070
Xp 26.764 28.917 27.040 31.629
Xn -51.710 -49.103 -30.040 -47.589
Dpvt 51.339 49.545 49.043 54.856
Dpt 66.158 62.662 60.066 67.398
fp1t 71.372 65.917 67.836 73.270

REFERENCE SIGNS LIST 1 mirrorless single-lens camera 2 body 3 lens barrel 21 CCD sensor 30 zoom lens 31, G1 first lens group 31a first sub-a group 31b first sub-b group 32 second lens group (composite lens group Gn)
33 third lens group (composite lens group Gp)
33v Sub-group (vibration control group Gv)
34 Fourth lens group (lens group Gf)
35 Fifth lens group (lens group Gr)
36, S Aperture stop OA Optical axis

Claims (13)

The lens has, in order from the object side, a front group having negative refractive power and a rear group having positive refractive power;
the front group includes, as a lens group and a composite lens group, in that order from the object side, a lens group G1 having a positive refractive power and a composite lens group Gn having a negative refractive power,
the rear group includes, in order from the object side, a composite lens group Gp having positive refractive power and a lens group Gf having negative refractive power;
the rear group further includes a lens group Gr having a negative refractive power located closer to the image surface than the lens group Gf,
The composite lens group Gp has one or more lens groups,
the composite lens group Gp has a vibration reduction group Gv that has a negative refractive power and moves in a direction perpendicular to the optical axis to correct image blur,
When the magnification is changed between the wide-angle end and the telephoto end, the distance on the optical axis between the adjacent lens groups changes, and the lens group G1 is fixed.
During focusing, the lens group Gf moves along the optical axis,
A zoom lens that satisfies the following formula:
0.65≦|fv|/fpt≦2.00 (1)
0.60≦Dpvt/Dpt≦0.90 (2)
however,
fv: focal length of the vibration reduction group Gv fpt: focal length of the composite lens group Gp at the telephoto end Dpvt: distance on the optical axis at the telephoto end from the lens surface of the composite lens group Gp closest to the object to the lens surface of the vibration reduction group Gv closest to the object Dpt: distance on the optical axis at the telephoto end from the lens surface of the composite lens group Gp closest to the object to the lens surface of the composite lens group Gp closest to the image surface The composite lens group Gp has one or more lenses each on the object side of the image stabilization group Gv and on the image plane side of the image plane side of the image stabilization group Gv. All lenses placed on the sides have positive refractive power as a whole,
2. The zoom lens according to claim 1, wherein all lenses arranged closer to the image plane than the image stabilization group Gv in the composite lens group Gp have positive refractive power as a whole. 3. The zoom lens according to claim 2, which satisfies the following formula:
0.60≦fp1t/fpt≦1.80 (3)
however,
fp1t: focal length at the telephoto end of all lenses arranged on the object side of the image stabilization group Gv in the composite lens group Gp 2. The zoom lens of claim 1, wherein the following formula is satisfied:
−0.90≦fr/ft≦−0.03 (4)
however,
fr: focal length of the lens group Gr, ft: focal length of the zoom lens at the telephoto end when focused on infinity The zoom lens according to claim 1, wherein the lens group Gr moves toward the object side on the optical axis during zooming from the wide-angle end to the telephoto end. The zoom lens according to claim 1, which satisfies the following formula.
1.01≦βrt/βrw≦1.50 (5)
however,
βrt: Lateral magnification of the lens group Gr at the telephoto end when focusing on infinity βrw: Lateral magnification of the lens group Gr at the wide-angle end when focusing on infinity 2. The zoom lens of claim 1, wherein the following formula is satisfied:
0.35≦Lt/ft≦0.70 (6)
however,
Lt: total optical length of the zoom lens at the telephoto end when focused on infinity ft: focal length of the zoom lens at the telephoto end when focused on infinity 2. The zoom lens of claim 1, wherein the following formula is satisfied:
5.0≦|{1−(βft) ² }×(βcrt) ² |≦13.0 (7)
however,
βft: lateral magnification at the telephoto end of the lens group Gf when focused on infinity βcrt: lateral magnification at the telephoto end of all lens groups on the image side of the lens group Gf when focused on infinity The lens group G1 has one or more lenses having negative refractive power,
2. The zoom lens according to claim 1, wherein at least one of the lenses having negative refractive power included in the lens group G1 satisfies the following formula:
−0.012≦ΔPgF1≦−0.001 (8)
however,
ΔPgF1: Anomalous dispersion of the lens having negative refractive power included in the lens group G1 The zoom lens according to claim 1, wherein at least one of the lenses having negative refractive power included in the lens group Gr satisfies the following formula.
0.015≦ΔPgFr≦0.050 (9)
however,
ΔPgFr: anomalous dispersion of the lens having negative refractive power included in the lens group Gr The zoom lens according to claim 1, which satisfies the following formula.
0.05≦fpt/ft≦0.20 (10)
however,
ft: Focal length at the telephoto end when focusing on infinity of the zoom lens 2. The zoom lens of claim 1, wherein the following formula is satisfied:
0.40≦f1/fw≦3.00 (11)
however,
f1: focal length of the lens group G1 fw: focal length of the zoom lens at the wide-angle end when focused on infinity An imaging device comprising the zoom lens according to any one of claims 1 to 12, and an image sensor provided on the image plane side of the zoom lens, which converts an optical image formed by the zoom lens into an electrical signal.

Images