WO2024062958A1

WO2024062958A1 - Zoom lens and imaging device

Info

Publication number: WO2024062958A1
Application number: PCT/JP2023/032963
Authority: WO
Inventors: 久幸山中; 純高橋; 俊典武; 啓吾古井田
Original assignee: 株式会社タムロン; 株式会社ニコン
Priority date: 2022-09-21
Filing date: 2023-09-11
Publication date: 2024-03-28

Abstract

Provided are a zooming lens and an imaging device that are small and light-weight, and have high optical performance. The zooming lens (30) comprises, in order from the object side, a negative front group and a positive rear group. The front group includes, in order from the object side, a positive lens group G1 (G1) and a negative composite lens group Gn (G2). The rear group includes a positive composite lens group Gp (G3), a negative lens group Gf (G4), and a negative lens group Gr (G5). The zooming lens (30) have specific optical characteristics expressed by two specific expressions.

Description

Zoom lens and imaging device

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

In recent years, imaging devices using solid-state imaging devices, such as digital still cameras and digital video cameras, have become widespread. Along with this, the optical systems of these imaging devices have become more sophisticated and smaller, and compact imaging device systems are rapidly becoming popular. In particular, for telephoto zoom lenses with long focal lengths, there is a growing demand for higher performance optical systems as well as smaller size and lighter weight.

The above-mentioned zoom lenses have a zoom ratio of about 4 times, a focal length of about 800 mm at the telephoto end when converted to 35 mm size, and a zoom lens with an F value of about 6.3 (for example, , see Patent Document 1). Although the zoom lens has a longer focal length at the telephoto end than conventional lenses, the telephoto ratio of the zoom lens is around 0.6, and the overall length of the zoom lens is reduced.

Japanese Patent Application Publication No. 2020-106778

In telephoto zoom lenses, the weight of the first lens group, which is located closest to the object, accounts for a large proportion of the overall weight of the zoom lens and is therefore dominant. Therefore, reducing the weight of the first lens group is effective in achieving a compact and lightweight zoom lens as a whole. Also, in order to achieve both a lightweight and high-performance zoom lens as a whole, it is effective to appropriately set the lens configuration, power arrangement, glass material, etc. of the first lens group.

In this regard, the configuration of the first lens group of the zoom lens described in Patent Document 1 is composed of, in order from the object side, a first negative lens, a first positive lens, and a second positive lens. In this way, the lens disposed closest to the object side has negative refractive power. Therefore, in the zoom lens described in Patent Document 1, there is still room for consideration from the viewpoint of reducing the weight of the first lens group.

An object of one aspect of the present invention is to provide a zoom lens and an imaging device that are small, lightweight, and have high optical performance.

In order to solve the above problems, a zoom lens according to one aspect of the present invention includes, 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 has only a lens group G1 having a positive refractive power and a composite lens group Gn having a negative refractive power as lens groups and composite lens groups, in order from the object side, 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, and the rear group further includes a lens group Gr having a negative refractive power closer to the image plane than the lens group Gf. The composite lens group Gn has one or more lens groups, and the composite lens group Gp has one or more lens groups, and when changing the magnification between the wide-angle end and the telephoto end, there is a difference between adjacent lens groups. The distance on the optical axis changes, and during focusing, the lens group Gf moves on the optical axis. The sub-group G1b has only one sub-group G1b, and the sub-group G1b has one or more lenses having a positive refractive power and one or more lenses having a negative refractive power, and satisfies the following formula.
0.32≦Dab/D1≦0.75 (1)
0.50≦BFw/Yw≦4.50 (2)
however,
Dab: distance on the optical axis between the lens surface closest to the image plane of the sub group G1a and the lens surface closest to the object side of the sub group G1b; D1: the distance between the lens surface closest to the object side of the lens group G1; , the distance on the optical axis between the lens surface of the lens group G1 that is closest to the image plane; BFw: the distance from the lens surface that is closest to the image plane to the image plane at the wide-angle end of the zoom lens when focusing on infinity; Distance on the optical axis Yw: Maximum image height at the wide-angle end of the zoom lens when focusing at infinity

Moreover, in order to solve the above-mentioned problem, an imaging device according to one aspect of the present invention includes the above-mentioned zoom lens and an optical image formed by the zoom lens provided on the image plane side of the zoom lens. and an image sensor that converts the signal into an electrical signal.

According to one aspect of the present invention, it is possible to provide a zoom lens and an imaging device that are small, lightweight, and have high optical performance.

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

Hereinafter, embodiments of a zoom lens and an imaging device according to an embodiment of the present invention will be described. More specifically, the present embodiment relates to a zoom lens and an imaging device suitable for an imaging device using a solid-state imaging device (CCD, CMOS, etc.) such as a digital still camera and a digital video camera. However, the zoom lens and imaging device described below are one embodiment 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 embodiments. Note that in this specification, "in order" means arranged adjacently unless otherwise specified.

1. Zoom lens 1-1. Optical Configuration A zoom lens according to an embodiment of the present invention includes, in order from the object side, a front group having a negative refractive power and a rear group having a positive refractive power. A zoom lens according to an embodiment of the present invention may include only a front group and a rear group. The front group is a set of multiple lens groups on the object side that have negative refractive power as a whole, and the rear group is a set of multiple lens groups on the image side that have positive refractive power as a whole. is a set of lens groups having . If there are multiple combinations of front and rear groups under the above conditions, the optical axis of the lens group closest to the image plane in the front group and the lens group closest to the object side in the rear group at the wide-angle end of the zoom lens. The set on the object side where the upper interval is widest is defined as the front group, and the set on the image plane side is defined as 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 sub group is composed of one or more lenses in one lens group. In the case where the subgroup is composed of two or more lenses, it is composed of two or more lenses that are consecutively arranged along the optical axis. The sub-groups are fixed within the lens group. That is, the sub-group is configured such that it can move along the optical axis together with the lens group, but cannot move independently on the optical axis within the lens group. A subgroup may be identified as a lens or a set of two or more lenses that achieves a particular optical property, such as the refractive power of the entire subgroup, from the lenses in the lens group.

Additionally, the zoom lens may include a cemented lens. The number of lenses in a cemented lens is the number of lenses cemented together. Examples of the cemented lens include a cemented lens in which a plurality of lenses are integrated without an air gap. Another example of a cemented lens is a cemented lens that is made up of a plurality of lenses that are bonded together by an adhesive that is very thin and has a thickness that does not substantially affect optical performance. In this case, the adhesive layer does not count as a lens. For example, a cemented lens in which two lenses are bonded together via an adhesive layer is counted as two lenses.

Further, the lens included in the zoom lens may include a compound lens in which one lens and resin are integrated. For example, a compound lens in which one lens and resin are integrated 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 has, as sub-groups, only a sub-group G1a having a positive refractive power and a sub-group G1b in order from the object side. 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.

The sub-group G1a has one or more lenses with 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.

The sub group G1b includes 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.

(3) Composite lens group Gn
The composite lens group Gn has negative refractive power as a whole. The composition of the composite lens group Gn may be appropriately determined within a range in which the entire lens group has negative refractive power. The composite lens group Gn has one or more lens groups, and may be composed of only one lens group, or may be composed of a plurality of lens groups. The composite lens group Gn is composed of a plurality of lens groups. By changing the distance between adjacent lens groups during zooming between the wide-angle end and the telephoto end, spherical aberration and field curvature can be suppressed over the entire zoom range. It is also preferable from the viewpoint of easy correction. When the composite lens group Gn is composed of a plurality of lens groups, the plurality of lens groups may include at least one lens group having positive refractive power.

The composite lens group Gn preferably has at least one lens with negative refractive power, and more preferably has two or more lenses with 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.

Further, it is preferable that the composite lens group Gn includes at least one lens having positive refractive power. The fact that the composite lens group Gn includes two or more lenses with negative refractive power and one or more lenses with positive refractive power allows for good correction of various aberrations, high zoom ratio, and high performance. This is preferable from the viewpoint of achieving both At this time, the lens closest to the object side of the composite lens group Gn is a lens having positive refractive power, which lowers the height of the light rays incident on the lens group arranged closer to the image plane than the composite lens group Gn. This is preferable because it contributes to miniaturization and weight reduction of the zoom lens as a whole.

(4) Rear group The rear group has positive refractive power as a whole. 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 includes a lens group Gr having a negative refractive power closer to the image plane than the lens group Gf. Such a configuration is preferable from the viewpoint of easily realizing a zoom lens with a short overall length, since the telephoto type refractive power arrangement can be made stronger.

The rear group may be comprised only of the above-mentioned 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 the lens group Gf and the lens group Gr. Alternatively, the rear group may include one or more lens groups on the image plane side of the lens group Gr.

(5) Composite Lens Group Gp
The composite lens group Gp has a 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 multiple lens groups. When the composite lens group Gp is composed of multiple lens groups, the multiple lens groups may have at least one lens group having a 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. Further, the composite lens group Gp includes, in order from the object side, a lens having a first positive refractive power, a lens having a second positive refractive power, a lens having a third positive refractive power, and a first lens having a positive refractive power. It is more preferable to have a lens with negative refractive power. 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.

It is preferable that the composite lens group Gp has a vibration isolation group Gv that has negative refractive power and moves in a direction perpendicular to the optical axis to correct image blur. The anti-vibration group Gv is a collection of one or more lenses. The anti-vibration group Gv is arranged closer to the image plane than the first lens having negative refractive power, so that the angle of incidence of the axial light beam incident on the anti-vibration group Gv becomes gentler, and eccentricity during image stabilization is reduced. This is preferable from the viewpoint of suppressing the occurrence of aberrations. In the composite lens group Gp, it is preferable that the vibration isolation group Gv be arranged closer to the image plane side from the viewpoint of realizing a smaller diameter of the vibration isolation group Gv.

The configuration of the anti-vibration group Gv can be appropriately determined within a range in which the entire lens has negative refractive power. It is preferable that the anti-vibration group Gv is composed of two or less lenses from the viewpoint of realizing miniaturization of the anti-vibration drive mechanism. In addition, the fact that the anti-vibration group Gv is composed of only a cemented lens consisting of one lens with positive refractive power and one lens with negative refractive power reduces chromatic aberration during anti-vibration. This is preferable from the viewpoint of good correction.

(6) Lens group Gf
Lens group Gf is arranged at a position adjacent to the image plane side of composite lens group Gp. Such a configuration is preferable from the viewpoint of realizing miniaturization and weight reduction of the zoom lens as well as miniaturization of the focus mechanism. The lens group Gf has negative refractive power as a whole and includes at least one lens having negative refractive power. The configuration of the lens group Gf has negative refractive power as a whole, and can be appropriately determined within the range of having at least one lens having negative refractive power. For example, it is preferable that the lens group Gf further includes a lens having positive refractive power from the viewpoint of suppressing aberration fluctuations over the entire object distance. Further, it is preferable that the lens group Gf has a lens having a positive refractive power and a lens having a negative refractive power in order from the object side, from the viewpoint of realizing a reduction in size and weight 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, having the lens group Gr include two or more lenses with negative refractive power and one or more lenses with positive refractive power strengthens the telephoto type structure and reduces 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 placed within the front group, within the rear group, or between the front group and the rear group. . Further, the aperture stop is preferably disposed in the rear group, and for example, may be disposed within the composite lens group Gp, or may be disposed between the composite lens group Gp and the lens group Gf. . It is preferable that the aperture stop is disposed in the rear group from the viewpoint of downsizing the aperture unit. When the aperture diaphragm is placed within the composite lens group Gp or between the composite lens group Gp and the lens group Gf, the diameter of the incident light beam becomes smaller, thereby realizing miniaturization of the aperture diaphragm unit. It is preferable from the viewpoint of

1-2. Operation (1) Variation of power When the zoom lens changes power between the wide-angle end and the telephoto end, the distance between adjacent lens groups on the optical axis changes. When changing the magnification between the wide-angle end and the telephoto end, the distance between each lens group on the optical axis only needs to change, and some lens groups are fixed in the optical axis direction (do not move on the optical axis). ) configuration. The lens group G1 is the heaviest lens group among the lens groups included in the zoom lens. Therefore, in order to move the heavy lens group to a predetermined position with high precision during zooming, the load applied to the members for driving the lens group G1 becomes large, and the structure for driving the lens group G1 also becomes large. Sometimes. From the viewpoint of realizing downsizing of the zoom lens, the lens group G1 is preferably fixed during zooming between the wide-angle end and the telephoto end.

Furthermore, it is preferable that at least one of the one or more lens groups included in the composite lens group Gn moves on the optical axis toward the image plane side during zooming from the wide-angle end to the telephoto end. When the composite lens group Gn has a plurality of lens groups, all the lens groups may move during zooming. It is preferable for the lens groups of the composite lens group Gn to move in this manner during zooming from the viewpoint of reducing the diameter of the lens groups after 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.

The focus group in the zoom lens may further include lens groups other than lens group Gf. In a zoom lens, for example, one or more lens groups having positive or negative refractive power, which are arranged on the image plane side of the lens group Gf, are moved on the optical axis with a movement trajectory different from that of the lens group Gf. It is also possible to use a configuration in which focusing is performed using . In this way, the so-called floating focus method may be adopted for the zoom lens. Such a configuration is preferable from the viewpoint of better correcting spherical aberration and field curvature over the entire object distance.

1-3. Formula Expressing Conditions of Zoom Lens It is desirable that the zoom lens according to the present embodiment employs the above-described configuration and satisfies at least one or more of the following formulas.

1-3-1. Formula (1)
0.32≦Dab/D1≦0.75 (1)
however,
Dab: Distance on the optical axis between the lens surface closest to the image plane of sub group G1a and the lens surface closest to the object side of sub group G1b D1: The distance between the lens surface closest to the object side of lens group G1 and lens group G1 Distance on the optical axis between the lens surface closest to the image plane and

Equation (1) is an equation for appropriately setting the distance on the optical axis between the sub-group G1a and the sub-group G1b with respect to the total length of the lens group G1. Specifically, equation (1) calculates the distance on the optical axis between the lens surface closest to the object side of the lens group G1 and the lens surface closest to the image plane side of the lens group G1, This is a formula for appropriately setting the distance on the optical axis between the lens surface on the image plane side and the lens surface closest to the object side of the sub group G1b. It is preferable to satisfy the formula (1) from the viewpoint of reducing the weight of the lens group G1, which is the heaviest among the lens groups included in the zoom lens, and at the same time, satisfactorily correcting various aberrations.

When Dab/D1 is less than the lower limit of equation (1), the height of the light rays incident on subgroup G1b from the optical axis increases, which is mainly advantageous for correcting spherical aberration and chromatic aberration, but It may be difficult to achieve weight reduction. Furthermore, when Dab/D1 exceeds the upper limit of equation (1), it is advantageous to reduce the weight of the subgroup G1b, but it may be difficult to satisfactorily correct various aberrations.

From the viewpoint of realizing weight reduction of the sub group G1b, Dab/D1 is more preferably 0.34 or more, more preferably 0.36 or more, more preferably 0.38 or more, More preferably, it is 0.40 or more. From the viewpoint of satisfactorily correcting various aberrations, Dab/D1 is more preferably 0.72 or less, more preferably 0.69 or less, more preferably 0.66 or less, and 0. It is more preferably 63 or less, more preferably 0.60 or less, and even more preferably 0.57 or less.

1-3-2. Formula (2)
0.50≦BFw/Yw≦4.50 (2)
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 (2) 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 (2) calculates the maximum image height at the wide-angle end when the zoom lens focuses at infinity to the lens surface closest to the image plane at the wide-angle end when the zoom lens focuses at infinity. 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 (2) 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 less than the lower limit of equation (2), the back focus may become too short and the inclination angle of the light incident on the image sensor with respect to the optical axis may become too large. In order to reduce the inclination angle, it is necessary to increase the exit pupil diameter, so it may be difficult to reduce the diameter of the lens group located closest to the image plane of the zoom lens. Furthermore, when BFw/Yw exceeds the upper limit of equation (2), the back focus becomes too long, and it may be difficult to downsize the zoom lens at the wide-angle end.

From the viewpoint of reducing the diameter of the lens group located closest to the image plane of the zoom lens, BFw/Yw is more preferably 0.70 or more, more preferably 0.75 or more, and 0.70 or more. It is more preferably 80 or more, more preferably 0.85 or more, and even more preferably 0.90 or more. Further, from the viewpoint of realizing miniaturization of the zoom lens at the wide-angle end, BFw/Yw is more preferably 4.20 or less, more preferably 3.90 or less, and 3.60 or less. is more preferable, and more preferably 3.30 or less.

1-3-3. Formula (3)
0.80≦f1a/f1≦1.70 (3)
however,
f1a: Focal length of sub group G1a f1: Focal length of lens group G1

Equation (3) is an equation for appropriately setting the ratio of the focal length of the sub group G1a to the focal length of the lens group G1. Specifically, equation (3) is an equation for appropriately setting the focal length of the sub group G1a with respect to the focal length of the lens group G1. It is preferable to satisfy formula (3) from the viewpoint of being able to satisfactorily correct various aberrations while reducing the weight of the zoom lens.

If f1a/f1 is less than the lower limit of equation (3), the focal length of subgroup G1a becomes too small relative to the focal length of lens group G1, making it difficult to satisfactorily correct spherical aberration and chromatic aberration. There is. Furthermore, if f1a/f1 exceeds the upper limit of equation (3), it may be difficult to reduce the size of the sub-group G1b, which may make it difficult to reduce the weight of the entire zoom lens. .

From the viewpoint of satisfactorily correcting spherical aberration and chromatic aberration, f1a/f1 is more preferably 0.85 or more, more preferably 0.90 or more, more preferably 0.95 or more, More preferably, it is 1.00 or more. From the viewpoint of realizing miniaturization of the sub group G1b and weight reduction of the entire zoom lens, f1a/f1 is more preferably 1.65 or less, more preferably 1.60 or less, It is more preferably 1.55 or less, more preferably 1.50 or less, more preferably 1.45 or less, and even more preferably 1.40 or less.

1-3-4. Formula (4)
0.65≦Hbt/Hat≦0.93 (4)
however,
Hat: Height from the optical axis of the marginal ray passing through the lens surface closest to the object at the telephoto end when the sub group G1a is focused at infinity Hbt: Height at the telephoto end when the sub group G1b is focused at infinity Height from the optical axis of the marginal ray passing through the lens surface closest to the object

Equation (4) is an equation for appropriately setting the ratio between the height of the axial ray at the telephoto end of the sub-group G1a when focusing at infinity and the height of the axial ray of the sub-group G1b. Specifically, Equation (4) is based on the height from the optical axis of the marginal ray passing through the lens surface closest to the object at the telephoto end when the sub group G1a is focused at infinity. This is a formula for appropriately setting the height from the optical axis of the marginal ray that passes through the lens surface closest to the object at the telephoto end during long distance focusing. It is preferable to satisfy the expression (4) from the viewpoint of reducing the weight of the lens group G1, which is the heaviest among the lens groups included in the zoom lens, and at the same time, satisfactorily correcting various aberrations.

When Hbt/Hat is less than the lower limit of equation (4), the subgroup G1b can be made smaller and lighter, but it may be difficult to satisfactorily correct mainly spherical aberration and chromatic aberration. Furthermore, if Hbt/Hat exceeds the upper limit of equation (4), it will be difficult to achieve sufficient miniaturization of subgroup G1b, and therefore it will be difficult to achieve sufficient weight reduction of the entire zoom lens. It may happen.

From the viewpoint of satisfactorily correcting spherical aberration and chromatic aberration, Hbt/Hat is more preferably 0.68 or more, more preferably 0.71 or more, more preferably 0.74 or more, It is more preferably 0.77 or more, and even more preferably 0.80 or more. Further, from the viewpoint of realizing weight reduction of the entire zoom lens, Hbt/Hat is more preferably 0.92 or less, more preferably 0.91 or less, and preferably 0.90 or less. More preferably, it is 0.89 or less, and even more preferably 0.88 or less.

1-3-5. Formula (5)
-0.90≦fr/ft≦-0.03 (5)
however,
fr: Focal length of lens group Gr ft: Focal length at the telephoto end when focusing on infinity of the zoom lens

Equation (5) is an equation for appropriately setting the ratio between the focal length of the lens group Gr and the focal length at the telephoto end when the zoom lens is focused at infinity. Specifically, equation (5) is an equation for appropriately setting the focal length of the lens group Gr with respect to the focal length at the telephoto end when the zoom lens is focused at infinity. It is preferable to satisfy formula (5) from the viewpoint of ensuring a telephoto type refractive power arrangement and easily realizing miniaturization of the entire zoom lens.

When fr/ft is less than the lower limit of equation (5), the telephoto type refractive power arrangement becomes weak, and it may be difficult to realize miniaturization of the overall length. For example, if the positive refractive power of the lens group G1 is strengthened to ensure a telephoto configuration, it may be difficult to correct chromatic aberration particularly well. Furthermore, when fr/ft exceeds the upper limit of equation (5), the telephoto type refractive power arrangement becomes too strong, and it may become difficult to satisfactorily correct the strong curvature of field in the over direction.

From the viewpoint of realizing miniaturization of the total length, fr/ft is more preferably -0.80 or more, more preferably -0.75 or more, and more preferably -0.70 or more. , more preferably -0.65 or more, more preferably -0.60 or more, more preferably -0.55 or more, more preferably -0.50 or more. Furthermore, from the viewpoint of satisfactorily correcting strong overdirection field curvature, fr/ft is more preferably -0.08 or less, more preferably -0.13 or less, and -0.18 It is more preferably below, more preferably -0.23 or less, even more preferably -0.28 or less.

1-3-6. Equation (6)
1.01≦βrt/βrw≦1.50 (6)
however,
βrt: lateral magnification at the telephoto end when the lens group Gr is focused at infinity βrw: lateral magnification at the wide-angle end when the lens group Gr is focused at infinity

Equation (6) 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 (6) 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 (6) 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 (6), 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. Further, if βrt/βrw exceeds the upper limit of equation (6), the load on the lens group Gr for changing the magnification becomes too large, and it may become difficult to satisfactorily correct the curvature of field.

From the viewpoint of realizing a high zoom ratio, βrt/βrw is more 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 field curvature, βrt/βrw is more preferably 1.40 or less, more preferably 1.30 or less, and even more preferably 1.25 or less.

1-3-7. Formula (7)
0.65≦|fv|/fpt≦2.00 (7)
however,
fv: Focal length of the anti-vibration group Gv fpt: Focal length of the composite lens group Gp at the telephoto end

Equation (7) is an equation for appropriately setting the ratio between the refractive power of the anti-vibration group Gv and the refractive power of the composite lens group Gp at the telephoto end. Specifically, equation (7) is an equation for appropriately setting the absolute value of the focal length of the image stabilization group Gv with respect to the focal length of the composite lens group Gp at the telephoto end. It is preferable to satisfy formula (7) from the viewpoint of controlling the drive amount of the vibration isolation group Gv within an appropriate range during vibration isolation and suppressing aberrations that occur during vibration isolation.

When |fv|/fpt is less than the lower limit of equation (7), 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 (7), 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.

1-3-8. Formula (8)
0.35≦Lt/ft≦0.70 (8)
however,
Lt: Total optical length of the zoom lens at the telephoto end when focusing on infinity ft: Focal length of the zoom lens at the telephoto end when focusing on infinity

Equation (8) is a formula 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 (8) 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" 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 (8) 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 (8), 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 (8), 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.

1-3-9. Formula (9)
5.0≦|{1-(βft) ² }×(βcrt) ² |≦13.0 (9)
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 (9) is the relationship between the lateral magnification of the lens group Gf at the telephoto end when focused at infinity and the lateral magnification at the telephoto end of all the lens groups on the image side than the lens group Gf when focused at infinity. This is a formula for appropriately setting the relationship |{1−(βft) ² }×(βcrt) ² |. Satisfying equation (9) is preferable from the viewpoint of controlling focus position sensitivity within an appropriate range when lens group Gf is used as a focus group.

If |{1−(βft) ² }×(βcrt) ² | is less than the lower limit of equation (9), 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 (9), 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 increasing in size, |{1-(βft) ² }×(βcrt) ² | is more preferably 5.4 or more, more preferably 5.8 or more, and 6 It is more preferably .2 or more, more preferably 6.6 or more, and even more preferably 7.0 or more. Further, |{1-(βft) ² }×(βcrt) ² | is more preferably 12.5 or less, more preferably 12.0 or less, and more preferably 11.5 or less. It is preferably 11.0 or less, more preferably 10.5 or less.

1-3-10. Formula (10)
55.0≦vdp≦78.0 (10)
however,
vdp: Abbe number at d-line of at least one lens with positive refractive power included in subgroup G1a

Equation (10) is an equation for appropriately setting the Abbe number at the d-line of at least one lens with positive refractive power included in the subgroup G1a. When the sub group G1a includes a plurality of lenses having positive refractive power, it is sufficient that at least one lens having positive refractive power satisfies Expression (10). Satisfying formula (10) is preferable from the viewpoint of achieving a zoom lens that has high optical performance with good correction of chromatic aberration, and at the same time reducing the weight of the zoom lens.

If vdp is less than the lower limit of equation (10), the correction of chromatic aberration at the telephoto end may be insufficient, and it may be difficult to realize a zoom lens with high optical performance. Further, when vdp exceeds the upper limit of equation (10), the Abbe number at the d-line of the lens having positive refractive power included in subgroup G1a may become too large. A glass material with a large Abbe number at the d-line tends to have a large specific gravity, and the sub group G1a tends to be composed of the lens with the largest diameter among the lenses constituting the zoom lens. Therefore, the specific gravity has a large effect on the weight of the lens. Therefore, it may be difficult to reduce the weight of the subgroup G1a.

From the viewpoint of realizing a zoom lens with high optical performance, vdp is more preferably 58.0 or more, more preferably 61.0 or more, and even more preferably 63.0 or more. Further, from the viewpoint of realizing weight reduction of the subgroup G1a, vdp is more preferably 75.0 or less, and more preferably 72.0 or less.

1-3-11. Formula (11)
-0.012≦ΔPgF1b≦-0.001 (11)
however,
ΔPgF1b: Anomalous dispersion of at least one lens having negative refractive power included in subgroup G1b

Equation (11) is a formula for appropriately setting the anomalous dispersion ΔPgF1b at the g-line and F-line of at least one lens having negative refractive power in the sub-group G1b. When the sub-group G1b has multiple lenses having negative refractive power, at least one lens having negative refractive power only needs to satisfy equation (11). 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, which has a partial dispersion ratio of 0.5393 and νd of 60.49, and the coordinates of glass material F2, which has 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 ratios 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 is corrected by using a low-dispersion glass material for lenses with positive refractive power, and using a high-dispersion glass material for lenses with negative refractive power. There is. However, when the reference line is a straight line passing through the coordinates of the partial dispersion ratios of glass materials C7 and F2 and the Abbe number (νd) for the d-line, the deviation from the reference line of the partial dispersion ratio of glass materials on the low dispersion side is positive. Located in the 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 whose deviation from the reference line of the partial dispersion ratio is in the negative direction for the glass material on the high dispersion side. Therefore, it is preferable to satisfy formula (11) from the viewpoint of easily realizing a zoom lens having high optical performance in which lateral chromatic aberration is well corrected, especially at the telephoto end.

If ΔPgF1b is less than the lower limit of equation (11), excessive chromatic aberration correction may cause the curvature of the lens with negative refractive power of sub group G1b to become too strong. If the curvature of the lens having negative refractive power included in the sub group G1b becomes strong, the influence on the lens weight becomes large, and it may become difficult to realize a weight reduction of the zoom lens. Furthermore, if ΔPgF1b exceeds the upper limit of equation (11), correction of chromatic aberration on the short wavelength side at the telephoto end may become insufficient, making it difficult to realize a zoom lens with high optical performance.

From the viewpoint of realizing weight reduction of the zoom lens, ΔPgF1b 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. Further, from the viewpoint of realizing a zoom lens with high optical performance, ΔPgF1b 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.

1-3-12. Formula (12)
0.05≦fpt/ft≦0.20 (12)
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 (12) 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 (12) is an equation for appropriately setting the focal length of the composite lens group Gp at the telephoto end with respect to the focal length at the telephoto end when the zoom lens is focused at infinity. Satisfying equation (12) is preferable from the viewpoint of making it easy to satisfactorily correct various aberrations and realizing a compact and lightweight zoom lens with a short overall length.

If fpt/ft is less than the lower limit of equation (12), the refractive power of the composite lens group Gp becomes 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 (12), 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.

1-3-13. Formula (13)
0.40≦f1/fw≦3.00 (13)
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 (13) is an equation for appropriately setting the ratio between the focal length of the lens group G1 and the focal length at the wide-angle end when the zoom lens is focused at infinity. Specifically, equation (13) is an equation for appropriately setting the focal length of the lens group G1 with respect to the focal length at the wide-angle end when the zoom lens is focused at infinity. Satisfying equation (13) is preferable from the viewpoint of realizing a zoom lens having high optical performance while realizing miniaturization of the zoom lens at the wide-angle end.

When f1/fw is less than the lower limit of equation (13), the refractive power of the lens group G1 becomes too large, and it may become difficult to satisfactorily correct the curvature of field at the wide-angle end. Further, when f1/fw exceeds the upper limit of equation (13), 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.

1-3-14. Formula (14)
Xp/(-Xn)≦1.0 (14)
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

Equation (14) expresses the amount of movement of the lens group having positive refractive power in the composite lens group Gp relative to the amount of movement of the lens group having negative refractive power in the composite lens group Gn when zooming from the wide-angle end to the telephoto end. This is a formula for appropriately setting the ratio of the amount of movement of . When the composite lens group Gn includes a plurality of lens groups having negative refractive power, it is sufficient that one or more lens groups having negative refractive power satisfy Expression (14). When the composite lens group Gp includes a plurality of lens groups having positive refractive power, it is sufficient that one or more lens groups having positive refractive power satisfy Expression (14). Here, the sign of each movement amount is positive when moving toward the object side on the optical axis when changing the magnification from the wide-angle end to the telephoto end. It is preferable to satisfy formula (14) from the viewpoint of reducing the diameter of the rear group and from the viewpoint of realizing weight reduction of the zoom lens as a whole.

If Xp/(-Xn) exceeds the upper limit of equation (14), 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.

1-3-15. Formula (15)
35.0≦vdn≦55.0 (15)
however,
vdn: Abbe number at the d-line of the lens with negative refractive power that subgroup G1b has

Equation (15) is an equation for appropriately setting the Abbe number at the d-line of the lens having negative refractive power included in sub group G1b. In the case where the sub group G1b includes a plurality of lenses having negative refractive power, at least one of the lenses having negative refractive power only needs to satisfy Expression (15). It is preferable to satisfy formula (15) from the viewpoint of realizing a zoom lens having high optical performance with good correction of chromatic aberration and reducing the weight of the zoom lens.

If vdn is less than the lower limit of equation (15), correction of chromatic aberration at the telephoto end may be insufficient, making it difficult to realize a zoom lens with high optical performance. Further, when vdn exceeds the upper limit of equation (15), the curvature of the lens having negative refractive power of subgroup G1b may become too strong in order to obtain a secondary spectrum of equivalent chromatic aberration. The sub group G1b tends to be composed of lenses with the second largest diameter after the sub group G1a among the lenses that make up the zoom lens. , the influence on the lens weight becomes large, and it may become difficult to realize the weight reduction of the sub group G1b.

From the viewpoint of realizing a zoom lens with high optical performance, vdn is more preferably 37.0 or more, more preferably 39.0 or more, and even more preferably 41.0 or more. Further, from the viewpoint of realizing weight reduction of the subgroup G1b, vdn is more preferably 53.0 or less, more preferably 51.0 or less, more preferably 49.0 or less, Vdn is more preferably 47.0 or less.

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, there is no limitation to the image sensor, and a solid-state image sensor such as a CCD (Charge Coupled Device) sensor or a CMOS (Complementary Metal Oxide Semiconductor) sensor can be used as the image sensor, and a silver halide film or the like can also be used. can. The imaging device according to this embodiment is suitable for imaging devices using the above solid-state imaging device, such as digital cameras and video cameras. Further, the imaging device may be a fixed-lens imaging device in which the lens is fixed to a housing, or may be an interchangeable-lens 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 an imaging device such as a single-lens reflex camera that is equipped with an optical finder, a phase difference sensor, and a reflex mirror for branching light between them.

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 aspect 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 equations (1) and (2). The first lens group 31 includes a first sub-a group 31a and a first sub-b group 31b. Note that a diaphragm 36 is arranged 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-described 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 arranged in the main body 2 at a position where the optical axis OA of the zoom lens 30 in the lens barrel 3 mounted on the main body 2 is the central axis. Instead of the cover glass 22, the main body 2 may have a parallel flat plate having no substantial refractive power.

The imaging device according to the present embodiment includes an image processing unit that electrically processes the captured image data acquired by the image sensor to change the shape of the captured image, and a device for processing the captured image data in the image processing unit. It is more preferable to include an image correction data holding unit that holds image correction data, an image correction program, etc. used for the image correction.

When a zoom lens is miniaturized, the shape of the captured image formed on the 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 to have the image correction data storage unit store magnification chromatic aberration correction data in advance. It is also preferable that the image processing unit performs magnification chromatic aberration correction of the captured image using the magnification chromatic aberration correction data stored in the image correction data storage unit. By correcting the magnification chromatic aberration, i.e., color distortion aberration, with the image processing unit, it is possible to reduce the number of lenses that make up the zoom lens. Therefore, with such an imaging device, it is possible to further miniaturize the zoom lens, obtain beautiful captured images, and miniaturize the entire imaging device.

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.

(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 Gn includes one or more lenses. The composite lens group Gp has one or more lens groups, and when zooming between the wide-angle end and the telephoto end, the distance between adjacent lens groups on the optical axis changes, and during focusing, the lens group Gf moves on the optical axis, and the lens group G1 has only subgroups G1a and G1b having positive refractive power in order from the object side, and the subgroup G1b has one or more lenses. The zoom lens includes a lens having a positive refractive power and one or more lenses having a negative refractive power, and satisfies the following formula.
0.32≦Dab/D1≦0.75 (1)
0.50≦BFw/Yw≦4.50 (2)
however,
Dab: Distance on the optical axis between the lens surface closest to the image side of sub group G1a and the lens surface closest to the object side of sub group G1b D1: The distance between the lens surface closest to the object side of lens group G1 and the lens group Distance on the optical axis between the lens surface closest to the image plane of G1 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 focusing on infinity of the zoom lens Yw: Maximum image height at the wide-angle end when focusing on infinity of the zoom lens

A zoom lens according to a second aspect of the present invention is a zoom lens according to the first aspect, in which one of the lenses having positive refractive power in the sub group G1b is disposed closest to the object side in the sub group G1b. Good too.

The zoom lens according to aspect 3 of the present invention may be a zoom lens in which the lens group G1 is fixed during zooming between the wide-angle end and the telephoto end in the above-mentioned

aspect

1 or 2.

The zoom lens according to aspect 4 of the present invention may be any one of aspects 1 to 3 described above, in which at least one of the 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.

In the zoom lens according to aspect 5 of the present invention, in any one of aspects 1 to 4, the lens group Gr moves on the optical axis toward the object side during zooming from the wide-angle end to the telephoto end. It can also be used as a zoom lens.

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.
0.80≦f1a/f1≦1.70 (3)
however,
f1a: Focal length of sub group G1a f1: Focal length of lens group G1

The zoom lens according to aspect 7 of the present invention may be a zoom lens that satisfies the following formula in any one of aspects 1 to 6 above.
0.65≦Hbt/Hat≦0.93 (4)
however,
Hat: Height from the optical axis of the marginal ray passing through the lens surface closest to the object at the telephoto end when the sub group G1a is focused at infinity Hbt: Height at the telephoto end when the sub group G1b is focused at infinity Height from the optical axis of the marginal ray passing through the lens surface closest to the object

The zoom lens according to aspect 8 of the present invention may be a zoom lens that satisfies the following expression in any one of aspects 1 to 7 above.
-0.90≦fr/ft≦-0.03 (5)
however,
fr: Focal length of lens group Gr ft: Focal length at the telephoto end when focusing on infinity of the zoom lens

The zoom lens according to aspect 9 of the present invention may be a zoom lens that satisfies the following formula in any one of aspects 1 to 8 above.
1.01≦βrt/βrw≦1.50 (6)
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

In the zoom lens according to aspect 10 of the present invention, in any one of aspects 1 to 9, the composite lens group Gp has negative refractive power and moves in a direction perpendicular to the optical axis to prevent image blur. It is also possible to use a zoom lens that has an anti-vibration group Gv to be corrected and satisfies the following equation.
0.65≦|fv|/fpt≦2.00 (7)
however,
fv: Focal length of the anti-vibration group Gv fpt: Focal length of the composite lens group Gp at the telephoto end

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.
0.35≦Lt/ft≦0.70 (8)
however,
Lt: Total optical length of the zoom lens at the telephoto end when focusing on infinity ft: Focal length of the zoom lens at the telephoto end when focusing on infinity

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.
5.0≦|{1-(βft) ² }×(βcrt) ² |≦13.0 (9)
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

The zoom lens according to aspect 13 of the present invention may be a zoom lens that satisfies the following formula in any one of aspects 1 to 12 described above.
55.0≦vdp≦78.0 (10)
however,
vdp: Abbe number at d-line of at least one lens with positive refractive power included in subgroup G1a

The zoom lens according to aspect 14 of the present invention may be a zoom lens that satisfies the following formula in any one of aspects 1 to 13 above.
-0.012≦ΔPgF1b≦-0.001 (11)
however,
ΔPgF1b: Anomalous dispersion of at least one lens having negative refractive power included in subgroup G1b

The zoom lens according to aspect 15 of the present invention may be a zoom lens that satisfies the following formula in any one of aspects 1 to 14 described above.
0.05≦fpt/ft≦0.20 (12)
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

The zoom lens according to aspect 16 of the present invention may be a zoom lens that satisfies the following formula in any one of aspects 1 to 15 above.
0.40≦f1/fw≦3.00 (13)
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 aspect 17 of the present invention includes the zoom lens according to any one of aspects 1 to 16, and an optical image formed by the zoom lens provided on the image plane side of the zoom lens. The image capturing device may include an image capturing element that performs conversion.

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 is composed of, 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, 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 a convex surface facing the object side.

The fifth lens group G5 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 1, the first lens group G1 corresponds to the above-mentioned 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 Gv.

The zoom lens of Example 1 performs a zooming operation by changing the distance between adjacent lens groups on the optical axis. In the figure, the arrows shown below each lens group at the wide-angle end indicate the locus of movement of each lens group when moving from the wide-angle end to the telephoto end. 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.

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

In addition, in the table of surface data in the embodiment of the present invention, "surface number" is the order of the lens surface counted from the object side, "r" is the radius of curvature of the lens surface, and "d" is the number on the optical axis of the lens surface. The interval "nd" represents the refractive index for the d-line (wavelength λ=587.56 nm), and "vd" represents the Abbe number for the d-line. Further, in the surface number, the symbol "S" indicates that the lens is a diaphragm, and the symbol "ASPH" indicates that the lens surface is an aspherical surface. Furthermore, the indications such as "d(7)" and "d(14)" in the "d" column indicate that the interval on the optical axis of the lens surface is a variable interval that changes when changing the magnification or focusing. means.

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 r d 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 a specification table of the zoom lens of Example 1. In this specification table, numerical values at the wide-angle end, intermediate focal length state, and telephoto end are shown in order from the left side. In the specification table, "f" represents the focal length of the zoom lens when focusing at infinity, "FNo." represents the F number, "ω" represents the half angle of view, and "Y" represents the maximum image height. Further, in the specification table, "d(n)" (n is an integer) represents a variable interval on the optical axis of the zoom lens during zooming. In addition, in Table 2, the "wide-angle end", "intermediate" and "telephoto end" on the left represent the variable interval when focusing at infinity, and the "wide-angle end", "intermediate" and "telephoto end" on the right represent the shooting distance. It represents the variable interval when focusing at a distance of 2400 mm. The same applies to the specification tables in the following examples.

[Table 2]
Wide-angle end Intermediate Telephoto end f 184.9819 349.9912 582.1707
FNo. 5.1502 5.6457 6.5297
ω 6.5781 3.4710 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 2070.5450
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 is a table showing aspherical coefficients of each aspherical surface in the zoom lens of Example 1. The aspheric coefficients in the table are values when each aspheric shape is defined by the following formula.
[Formula] z=ch ² / [1+{1-(1+k)c ² h ² } ^1/2 ]+A4h ⁴ +A6h ⁶ +A8h ⁸ +A10h ¹⁰ +A12h ¹²

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

[Table 3]
Surface number k A4 A6
42 0.0000 5.44991E-06 3.77913E-09
Surface 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 makes up 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 the longitudinal aberration of the zoom lens of Example 1 at the wide-angle end, intermediate focal length state, and infinity focusing 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 is the half angle of view, and the horizontal axis is defocus. In the figure showing astigmatism, the solid line shows the astigmatism in the sagittal image plane (indicated by ds in the figure) for the d-line, and the broken line shows the astigmatism in the meridional plane (indicated by dm in the figure) for the d-line.

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

[Example 2]
FIG. 5 is a diagram schematically showing the optical configuration of the zoom lens of Example 2 at the wide-angle end when focusing on infinity. 6, 7, and 8 are diagrams showing the longitudinal aberration of the zoom lens of Example 2 at the wide-angle end, intermediate focal length state, and telephoto end when focusing at infinity, respectively. The zoom lens of Example 2 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, 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 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, and a biconcave lens L7.

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

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 a biconvex lens L13 on the object side. Consists of a three-piece cemented lens consisting of a negative meniscus lens L14 with a convex surface facing, 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. be done. 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 a 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 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 Gv.

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 of the zoom lens of Example 2. In Table 5, No. 1 to 7 are surface numbers of the first lens group G1; 8 to 12 are surface numbers of the second lens group G2; 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; 22 represents an aperture stop. No. 34 and 35 are surface numbers of the fifth lens group G5. 36 to 44 are surface numbers of the sixth lens group G6.

[Table 5]
Surface number r d 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 a specification table of the zoom lens of Example 2. Table 7 is a table showing aspherical coefficients of each aspherical surface in the zoom lens of Example 2. Table 8 shows the focal length 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 is composed of, 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 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 a biconvex lens L5 and a biconcave lens L6 in order from the object side.

The third lens group G3 is composed of, 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.

In the zoom lens of Example 3, 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 and the third lens group G3 correspond to the composite lens group Gn described above. The fourth lens group G4 corresponds to the composite lens group Gp described above. The fifth lens group G5 corresponds to the lens group Gf described above. The sixth lens group G6 corresponds to the lens group Gr described above. The first lens group G1, the second lens group G2, and the third lens group G3 correspond to the front group described above. 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 Gv described above.

The zoom lens of Example 3 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 9 is a table of surface data of the zoom lens of Example 3. In Table 9, No. 1 to 7 are surface numbers of the first lens group G1; 8 to 11 are surface numbers of the second lens group G2; 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; 23 represents an aperture stop. No. 35 and 36 are surface numbers of the fifth lens group G5; 37 to 45 are surface numbers of the sixth lens group G6.

[Table 9]
Surface number r d 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 specification table of the zoom lens of Example 3. Table 11 is a table showing aspherical coefficients of each aspherical surface in the zoom lens of Example 3. Table 12 shows the focal length of each lens group constituting 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 schematically showing the optical configuration of the zoom lens of Example 4 at the wide-angle end when focusing on infinity. FIGS. 14, 15, and 16 are diagrams showing longitudinal aberrations of the zoom lens of Example 4 at the wide-angle end, intermediate focal length state, and telephoto end when focusing on infinity. The zoom lens of Example 4 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive 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 negative refractive power. The fourth lens group G4 includes a sub-group Gv having negative refractive power. An aperture stop S is arranged 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 a 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 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 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, and a cemented lens of a biconvex lens L12 and a biconcave lens L13.

The fourth lens group G4 includes, in order from the object side, a biconvex lens L14, a negative meniscus lens L15 with a convex surface facing the object side, a three-piece cemented lens consisting of a biconvex lens L16, a biconcave lens L17, and a concave surface facing the object side. The lens is composed of a cemented lens of a positive meniscus lens L18 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 fifth lens group G5 is composed of, in order from the object side, a cemented lens consisting of a biconvex lens L22 and a biconcave lens L23.

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 Gv.

The zoom lens of Example 4 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 13 is a table of surface data of the zoom lens of Example 4. In Table 13, 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 13]
Surface number r d 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 a specification table of the zoom lens of Example 4. Table 15 is a table showing aspherical coefficients of each aspherical 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 Intermediate Telephoto end f 185.0329 350.1211 582.2405
FNo. 5.1476 5.6976 6.5270
ω 6.6359 3.5169 2.1317
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) 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]
Surface number k A4 A6
45 0.0000 2.07917E-05 2.90901E-08
Surface 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 schematically showing the optical configuration of the zoom lens of Example 5 at the wide-angle end when focusing on infinity. FIGS. 18, 19, and 20 are diagrams showing longitudinal aberrations of the zoom lens of Example 5 at the wide-angle end, intermediate focal length state, and telephoto end when focusing on infinity. The zoom lens of Example 5 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a 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 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 between the third lens group G3 and the fourth lens group G4.

The first lens group G1 is composed of, 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-group a G1a is composed of lens L1. The first sub-group b 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 negative meniscus lens L9 with a concave surface facing the object side.

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 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.

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 Gv.

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 r d 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 that constitutes 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 schematically showing the optical configuration of the zoom lens of Example 6 at the wide-angle end when focusing on infinity. FIGS. 22, 23, and 24 are diagrams showing longitudinal aberrations of the zoom lens of Example 6 at the wide-angle end, intermediate focal length state, and telephoto end when focusing at infinity, respectively. The zoom lens of Example 6 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, 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 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 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, 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 includes, 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, and a concave surface facing the object side. A three-piece cemented lens consisting of a positive meniscus lens L14, a negative meniscus lens L15 with a convex surface facing the object side, a biconvex lens L16, and a biconcave lens L17, and a positive meniscus lens L18 with a concave surface facing the object side and a biconcave lens L19. It is composed of a cemented lens, 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 fourth lens group G4 is composed of, 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 Gv.

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 of the zoom lens of Example 6. In Table 21, 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 35 are surface numbers of the third lens group G3; 23 represents an 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.

[Table 21]
Surface number r d 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 is composed of, 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-b group G1b is composed of a cemented lens of a lens L2 and a lens L3, and a lens L4.

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 its convex surface facing the object side.

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 Gv.

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

[Table 25]
Surface number r d 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 a specification table of the zoom lens of Example 7. Table 27 is a table showing aspherical coefficients of each aspherical 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]
Face number k A4 A6
42 0.0000 7.87716E-06 -1.01553E-09
Face 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 schematically 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, intermediate focal length state, and telephoto end when focusing on infinity. The zoom lens of Example 8 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, 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 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 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 fourth lens group G4 is composed of, in order from the object side, a cemented lens of a positive meniscus lens L22 with a concave surface and a biconcave lens L23.

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 Gv 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 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, No. 39 to 47 are surface numbers for the fifth lens group G5, and No. 48 and 49 are surface numbers for the sixth lens group G6.

[Table 29]
Surface number r d 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 specification table of the zoom lens of Example 8. Table 31 is a table showing aspherical coefficients of each aspherical 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 Intermediate Telephoto end f 185.0202 350.0371 582.2048
FNo. 5.1485 5.6965 6.5266
ω 6.5165 3.4560 2.0986
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 2070.5452
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

The values calculated using the above formulas and the numerical values used in the formulas in Examples 1 to 8 are shown in Table 33.

[Table 33]
Example 1 Example 2 Example 3 Example 4
Equation (1) Dab/D1 0.466 0.464 0.472 0.509
Formula (2) BFw/Yw 2.247 2.121 2.229 2.117
Equation (3) f1a/f1 1.112 1.209 1.209 0.934
Equation (4) Hbt/Hat 0.863 0.863 0.863 0.839
Equation (5) fr/ft -0.375 -0.445 -0.364 -0.838
Equation (6) βrt/βrw 1.084 1.086 1.090 1.035
Equation (7)|fv|/fpt 1.391 1.499 1.371 0.978
Formula (8) Lt/ft 0.566 0.566 0.566 0.566
Equation (9)|{1-(βft) ² }×(βcrt) ² | 7.459 7.745 7.565 7.690
Equation (10)vdp 70.44 70.44 70.44 70.44
Equation (11)ΔPgF1b -0.0067 -0.0067 -0.0067 -0.0067
Equation (12) fpt/ft 0.104 0.099 0.105 0.111
Equation (13) f1/fw 1.260 1.160 1.161 1.402
Equation (14)Xp/(-Xn) 0.427 0.660 0.481 0.539
Example 5 Example 6 Example 7 Example 8
Equation (1) Dab/D1 0.509 0.644 0.464 0.547
Formula (2)BFw/Yw 1.996 2.059 1.690 1.362
Equation (3) f1a/f1 1.200 1.276 1.178 1.088
Equation (4) Hbt/Hat 0.863 0.806 0.863 0.838
Equation (5) fr/ft -0.581 -0.783 -0.439 -0.189
Equation (6) βrt/βrw 1.051 1.038 1.113 1.150
Equation (7)|fv|/fpt 1.032 1.070 1.405 1.115
Formula (8) Lt/ft 0.566 0.566 0.562 0.566
Equation (9)|{1-(βft) ² }×(βcrt) ² | 7.062 9.124 7.765 7.892
Equation (10)vdp 70.44 70.44 70.44 70.44
Equation (11)ΔPgF1b -0.0067 -0.0067 -0.0067 -0.0067
Equation (12) fpt/ft 0.113 0.103 0.102 0.112
Equation (13) f1/fw 1.277 1.302 1.190 1.328
Equation (14)Xp/(-Xn) 0.518 0.589 0.900 0.665
Example 1 Example 2 Example 3 Example 4
Dab 26.620 26.902 27.148 29.785
D1 57.128 57.967 57.490 58.506
BFw 48.611 45.875 48.219 45.800
f1a 259.216 259.537 259.459 242.397
f1 233.028 214.642 214.695 259.472
Hbt 38.481 38.480 38.500 37.420
Hat 44.579 44.579 44.602 44.602
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
Example 5 Example 6 Example 7 Example 8
Dab 29.870 49.655 26.468 34.053
D1 58.693 77.107 57.097 62.244
BFw 43.170 44.547 36.563 29.455
f1a 283.468 307.365 259.468 267.320
f1 236.317 240.851 220.185 245.715
Hbt 38.503 35.960 38.500 37.366
Hat 44.606 44.602 44.602 44.602
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

1 Mirrorless single-lens camera 2 Main body 3 Lens barrel 21 CCD sensor 30 Zoom lens 31, G1 1st lens group 31a 1st sub-a group 31b 1st sub-b group 32 2nd lens group (composite lens group Gn)
33 Third lens group (composite lens group Gp)
33v sub group (anti-vibration group Gv)
34 Fourth lens group (lens group Gf)
35 Fifth lens group (lens group Gr)
36, S aperture diaphragm OA optical axis

Claims

In order from the object side, it has a front group having a negative refractive power and a rear group having a positive refractive power,
The front group has, as a lens group and a composite lens group, only a lens group G1 having a positive refractive power and a composite lens group Gn having a negative refractive power, in order from the object side,
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 includes a lens group Gr having a negative refractive power closer to the image plane than the lens group Gf,
The composite lens group Gn has one or more lens groups,
The composite lens group Gp has one or more lens groups,
When changing the magnification between the wide-angle end and the telephoto end, the distance between adjacent lens groups on the optical axis changes,
During focusing, the lens group Gf moves on the optical axis,
The lens group G1 has, as subgroups, only a subgroup G1a and a subgroup G1b having positive refractive power in order from the object side,
The sub-group G1b includes one or more lenses having positive refractive power and one or more lenses having negative refractive power,
A zoom lens that satisfies the following formula.
0.32≦Dab/D1≦0.75 (1)
0.50≦BFw/Yw≦4.50 (2)
however,
Dab: distance on the optical axis between the lens surface closest to the image plane of the sub group G1a and the lens surface closest to the object side of the sub group G1b; D1: the distance between the lens surface closest to the object side of the lens group G1; , the distance on the optical axis between the lens surface of the lens group G1 that is closest to the image plane; BFw: the distance from the lens surface that is closest to the image plane to the image plane at the wide-angle end of the zoom lens when focusing on infinity; Distance on the optical axis Yw: Maximum image height at the wide-angle end of the zoom lens when focusing at infinity
The zoom lens according to claim 1, wherein one of the lenses having the positive refractive power of the sub group G1b is disposed closest to the object side of the sub group G1b.
The zoom lens of claim 1, wherein the lens group G1 is fixed when changing magnification between the wide-angle end and the telephoto end.
The zoom lens according to claim 1, wherein at least one of the lens groups included in the composite lens group Gn moves on the optical axis toward the image plane during zooming from the wide-angle end to the telephoto end.
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.
0.80≦f1a/f1≦1.70 (3)
however,
f1a: Focal length of the sub group G1a f1: Focal length of the lens group G1
The zoom lens according to claim 1, which satisfies the following formula.
0.65≦Hbt/Hat≦0.93 (4)
however,
Hat: Height from the optical axis of the marginal ray passing through the lens surface closest to the object at the telephoto end when the sub group G1a is focused at infinity Hbt: The telephoto end when the sub group G1b is focused at infinity Height from the optical axis of the marginal ray passing through the lens surface closest to the object at
The zoom lens according to claim 1, which satisfies the following formula.
-0.90≦fr/ft≦-0.03 (5)
however,
fr: Focal length of the lens group Gr ft: Focal length at the telephoto end of the zoom lens when focusing on infinity
The zoom lens according to claim 1, which satisfies the following formula.
1.01≦βrt/βrw≦1.50 (6)
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
The composite lens group Gp has a vibration isolation group Gv that has negative refractive power and moves in a direction perpendicular to the optical axis to correct image blur,
The zoom lens according to claim 1, which satisfies the following formula.
0.65≦|fv|/fpt≦2.00 (7)
however,
fv: Focal length of the image stabilization group Gv fpt: Focal length of the composite lens group Gp at the telephoto end
The zoom lens according to claim 1, which satisfies the following formula.
0.35≦Lt/ft≦0.70 (8)
however,
Lt: Total optical length of the zoom lens at the telephoto end when focusing on infinity ft: Focal length of the zoom lens at the telephoto end when focusing on infinity
The zoom lens according to claim 1, which satisfies the following formula.
5.0≦|{1-(βft) 2 }×(βcrt) 2 |≦13.0 (9)
however,
βft: Lateral magnification at the telephoto end when the lens group Gf is focused at infinity βcrt: Lateral magnification at the telephoto end when all lens groups on the image plane side than the lens group Gf are focused at infinity
The zoom lens according to claim 1, which satisfies the following formula.
55.0≦vdp≦78.0 (10)
however,
vdp: Abbe number at the d-line of at least one lens having positive refractive power included in the subgroup G1a
The zoom lens according to claim 1, which satisfies the following formula.
-0.012≦ΔPgF1b≦-0.001 (11)
however,
ΔPgF1b: anomalous dispersion of at least one lens having negative refractive power included in the subgroup G1b
The zoom lens according to claim 1, which satisfies the following formula.
0.05≦fpt/ft≦0.20 (12)
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
The zoom lens according to claim 1, which satisfies the following formula.
0.40≦f1/fw≦3.00 (13)
however,
f1: Focal length of the lens group G1 fw: Focal length of the zoom lens at the wide-angle end when focusing on infinity
The zoom lens according to any one of claims 1 to 16, and an image sensor provided on the image plane side of the zoom lens and converting an optical image formed by the zoom lens into an electrical signal. , imaging device.