Zoom lens and imaging device

Abstract

To provide a small-size zoom lens that has high optical performance during image shake correction at a telephoto end.SOLUTION: A zoom lens (1a) has a plurality of lens groups. The plurality of lens groups comprises a first lens group (L1) having a positive refractive power, a second lens group (L2) having a negative refractive power, and a subsequent group (L3-L6) comprising one or more lens groups. The interval between the lens groups adjacent to each other changes in zooming, and the second lens group is immobile in zooming. In image shake correction, at least part of the second lens group moves in a direction including an optical axis (OA) and a component of a vertical direction. When the group thickness of the second lens group is defined as D2, and the focal length of the zoom lens at a telephoto end as ft, a conditional expression of 0.003<D2 / ft<0.026 is satisfied.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Patent Document 1 discloses a zoom lens which includes, in order from the object side to the image side, a first lens group through a fifth lens group having positive, negative, positive, negative, negative refractive powers, the spacing between adjacent lens groups changes during zooming, and which performs image blur correction with the second lens group. Patent Document 2 discloses a zoom lens which includes, in order from the object side to the image side, a first lens group through an eighth lens group having positive, negative, positive, negative, positive, negative, negative refractive powers, and which performs image blur correction with three partial lens groups in the second lens group closest to the image side. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2020-105111 [Patent Document 2] Patent No. 6969784 Summary of the Invention [Problem to be solved by the invention]

[0004] In the zoom lens disclosed in Patent Document 1, the second lens group, which moves during zooming and has strong refractive power, is used as an image blur correction group, resulting in degraded optical performance. Furthermore, to achieve even higher magnification, the refractive power of the second lens group must be made even stronger, which degrades optical performance due to manufacturing errors. In the zoom lens disclosed in Patent Document 2, the number of lenses in the second lens group is increased, making it difficult to achieve compactness. Furthermore, when achieving even greater telephoto capabilities, correction of decentering aberrations that occur during image blur correction is insufficient.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a compact zoom lens that has high optical performance when image blur is corrected at the telephoto end. [Means for solving the problem]

[0006] A zoom lens according to one aspect of the present invention is a zoom lens having a plurality of lens groups, the plurality of lens groups being arranged in order from the object side to the image side, including a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a subsequent group consisting of one or more lens groups, For an interval between adjacent lens groups varies, the second lens group remains stationary during zooming, and at least a portion of the second lens group moves in a direction including a component perpendicular to the optical axis during image blur correction; The lens disposed closest to the object side in the second lens group has positive refractive power, and the distance on the optical axis from the lens surface closest to the object side to the lens surface closest to the image side in the second lens group is Let D2 be the focal length of the zoom lens at the telephoto end, and ft be the focal length of the zoom lens at the telephoto end. 0.003 <D2 / ft<0.026 The following condition is satisfied.

[0007] Other objects and features of the present invention are illustrated in the following examples. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a compact zoom lens that has high optical performance when performing image blur correction at the telephoto end. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a cross-sectional view of a zoom lens at a wide-angle end in a first embodiment. [Figure 2] 3A to 3C are longitudinal aberration diagrams of the zoom lens in Example 1 at the wide-angle end, at the intermediate zoom position, and at the telephoto end. [Figure 3] 4A to 4C are lateral aberration diagrams of the zoom lens at the wide-angle end, at the intermediate zoom position, and at the telephoto end in Example 1. [Figure 4] 4A to 4C are lateral aberration diagrams of the zoom lens in Example 1 at the wide-angle end, at the intermediate zoom position, and at the telephoto end with 0.3 degree image stabilization. [Figure 5] FIG. 10 is a cross-sectional view of a zoom lens at a wide-angle end in a second embodiment. [Figure 6]10A to 10C are longitudinal aberration diagrams of the zoom lens at the wide-angle end, at the intermediate zoom position, and at the telephoto end in Example 2. [Figure 7] 10A to 10C are lateral aberration diagrams of the zoom lens at the wide-angle end, at the intermediate zoom position, and at the telephoto end in Example 2. [Figure 8] 10A to 10C are lateral aberration diagrams of the zoom lens in Example 2 at the wide-angle end, at the intermediate zoom position, and at the telephoto end with 0.3 degree image stabilization. [Figure 9] FIG. 10 is a cross-sectional view of a zoom lens at the wide-angle end in Example 3. [Figure 10] 10A to 10C are longitudinal aberration diagrams of the zoom lens at the wide-angle end, at the intermediate zoom position, and at the telephoto end in Example 3. [Figure 11] 10A to 10C are lateral aberration diagrams of the zoom lens at the wide-angle end, at the intermediate zoom position, and at the telephoto end in Example 3. [Figure 12] 10A to 10C are lateral aberration diagrams of the zoom lens in Example 3 at the wide-angle end, at the intermediate zoom position, and at the telephoto end with 0.3 degree image stabilization. [Figure 13] FIG. 10 is a cross-sectional view of a zoom lens at the wide-angle end in Example 4. [Figure 14] 10A to 10C are longitudinal aberration diagrams of the zoom lens at the wide-angle end, at the intermediate zoom position, and at the telephoto end in Example 4. [Figure 15] 10A to 10C are lateral aberration diagrams of the zoom lens at the wide-angle end, at the intermediate zoom position, and at the telephoto end in Example 4. [Figure 16] 10A to 10C are lateral aberration diagrams of the zoom lens in Example 4 at the wide-angle end, at the intermediate zoom position, and at the telephoto end with 0.3 degree image stabilization. [Figure 17] FIG. 10 is a cross-sectional view of a zoom lens at the wide-angle end in Example 5. [Figure 18] 10A to 10C are longitudinal aberration diagrams of the zoom lens at the wide-angle end, at the intermediate zoom position, and at the telephoto end in Example 5. [Figure 19] 10A to 10C are lateral aberration diagrams of the zoom lens at the wide-angle end, at the intermediate zoom position, and at the telephoto end in Example 5. [Figure 20] 10A to 10C are lateral aberration diagrams of the zoom lens in Example 5 at the wide-angle end, at the intermediate zoom position, and at the telephoto end with 0.3 degree image stabilization. [Figure 21] 1 is a schematic diagram of an imaging device equipped with a zoom lens in each embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0011] Zoom lenses used in imaging devices are required to have a short overall lens length, a compact size, a high zoom ratio, and high optical performance across the entire zoom range and all object distances. In particular, zoom lenses are required to maintain good optical performance (anti-vibration optical performance) during image blur correction at the telephoto end, while minimizing the increase in overall lens length and lens barrel diameter, and minimizing the increase in lens mass. In positive-lead zoom lenses, to satisfy these requirements, it is important to appropriately design each element constituting the zoom lens. To ensure anti-vibration optical performance, particularly at the telephoto end, and to minimize the increase in lens mass, it is important to appropriately design the configuration, position, and group thickness of the anti-vibration lens group.

[0012] The zoom lens of each embodiment has multiple lens groups. The multiple lens groups are arranged in order from the object side to the image side: a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, and a subsequent group consisting of one or more lens groups (L3 to L7). The spacing between adjacent lens groups changes during zooming, but the second lens group L2 remains stationary during zooming. In each embodiment, all or part of the second lens group L2 (at least part of the second lens group L2) is an image stabilizing lens group that performs image blur correction (image stabilizing operation) by moving (decentring) in a direction including a component perpendicular to the optical axis OA.

[0013] FIG. 1 is a cross-sectional view of a zoom lens 1a according to a first embodiment of the present invention. FIGS. 2A, 2B, and 2C are longitudinal aberration diagrams of the zoom lens 1a at the wide-angle end (FIG. 2A), the intermediate zoom position (FIG. 2B), and the telephoto end (FIG. 2C), respectively. FIGS. 3A, 3B, and 3C are lateral aberration diagrams of the zoom lens 1a at the wide-angle end, the intermediate zoom position, and the telephoto end, respectively. FIGS. 4A, 4B, and 4C are lateral aberration diagrams of the zoom lens 1a at the wide-angle end, the intermediate zoom position, and the telephoto end, respectively, with 0.3-degree image stabilization. The zoom lens 1a has a zoom ratio of 3.8 and an F-number of approximately 6.4 to 9.2.

[0014] FIG. 5 is a cross-sectional view of a zoom lens 1b according to a second embodiment of the present invention. FIGS. 6A, 6B, and 6C are longitudinal aberration diagrams of the zoom lens 1b at the wide-angle end, a mid-zoom position, and the telephoto end, respectively. FIGS. 7A, 7B, and 7C are lateral aberration diagrams of the zoom lens 1b at the wide-angle end, a mid-zoom position, and the telephoto end, respectively. FIGS. 8A, 8B, and 8C are lateral aberration diagrams of the zoom lens 1b at the wide-angle end, a mid-zoom position, and the telephoto end, respectively, with 0.3-degree image stabilization. The zoom lens 1b has a zoom ratio of 3.5 and an F-number of approximately 5.6 to 7.1.

[0015] FIG. 9 is a cross-sectional view of a zoom lens 1c according to a third embodiment of the present invention. FIGS. 10A, 10B, and 10C are longitudinal aberration diagrams of the zoom lens 1c at the wide-angle end, the intermediate zoom position, and the telephoto end, respectively. FIGS. 11A, 11B, and 11C are lateral aberration diagrams of the zoom lens 1c at the wide-angle end, the intermediate zoom position, and the telephoto end, respectively. FIGS. 12A, 12B, and 12C are lateral aberration diagrams of the zoom lens 1c at the wide-angle end, the intermediate zoom position, and the telephoto end, respectively, with 0.3-degree image stabilization. The zoom lens 1c has a zoom ratio of 3.8 and an F-number of approximately 5.9 to 9.2.

[0016] Fig. 13 is a cross-sectional view of a zoom lens 1d according to a fourth embodiment of the present invention. Figs. 14(A), (B), and (C) are longitudinal aberration diagrams of the zoom lens 1d at the wide-angle end, a mid-zoom position, and the telephoto end, respectively. Figs. 15(A), (B), and (C) are lateral aberration diagrams of the zoom lens 1d at the wide-angle end, a mid-zoom position, and the telephoto end, respectively. Figs. 16(A), (B), and (C) are lateral aberration diagrams of the zoom lens 1d at the wide-angle end, a mid-zoom position, and the telephoto end, respectively, with 0.3-degree image stabilization. The zoom lens 1d has a zoom ratio of 3.8 and an F-number of approximately 6.4 to 9.2.

[0017] Fig. 17 is a cross-sectional view of a zoom lens 1e according to a fifth embodiment of the present invention. Figs. 18(A), (B), and (C) are longitudinal aberration diagrams of the zoom lens 1e at the wide-angle end, a middle zoom position, and the telephoto end, respectively. Figs. 19(A), (B), and (C) are lateral aberration diagrams of the zoom lens 1e at the wide-angle end, a middle zoom position, and the telephoto end, respectively. Figs. 20(A), (B), and (C) are lateral aberration diagrams of the zoom lens 1e at the wide-angle end, a middle zoom position, and the telephoto end, respectively, with 0.3-degree image stabilization. The zoom lens 1e has a zoom ratio of 4.9 and an F-number of approximately 6.4 to 9.2.

[0018] The zoom lens of each embodiment is a zoom lens used in imaging devices such as digital cameras, video cameras, broadcast cameras, surveillance cameras, silver halide cameras, etc. The zoom lens of each embodiment can also be used as a projection optical system for a projection device (projector).

[0019] In the lens cross-sectional views of each embodiment, the left is the object side (front) and the right is the image side (rear). If i denotes the order of the lens groups from the object side, Li denotes the ith lens group. SP is the aperture stop. IP is the image plane. When a zoom lens is used in an imaging device such as a digital camera or video camera, the image plane IP corresponds to the imaging surface of an imaging element (photoelectric conversion element) such as a CCD sensor or CMOS sensor. When a zoom lens is used in an imaging device for a silver halide film camera, it corresponds to the film plane. When zooming from the wide-angle end to the telephoto end, each lens group moves as shown by the arrows. The focus arrow indicates the movement direction when focusing from an object at infinity to a close object. IS denotes an image stabilization lens group (anti-vibration lens group), and image stabilization is achieved by shifting the image stabilization lens group IS in a direction approximately perpendicular to the optical axis OA.

[0020] In the spherical aberration diagram, Fno is the F-number. The solid line d represents the d-line (wavelength 587.6 nm), and the two-dot chain line g represents the g-line (wavelength 435.8 nm). In the astigmatism diagram, the dotted line ΔM represents the meridional image plane at the d-line, and the solid line ΔS represents the sagittal image plane at the d-line. The distortion diagram shows the d-line. The lateral chromatic aberration diagram shows the g-line. ω is the half angle of view (degrees).

[0021] Next, the lens configuration of each embodiment will be described. The zoom lens 1a of the first embodiment is a six-group zoom lens. The zoom lens 1a is composed of, from the object side to the image side, a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L3 with positive refractive power, a fourth lens group L4 with positive refractive power, a fifth lens group L5 with negative refractive power, and a sixth lens group L6 with negative refractive power. The third lens group L3, the fourth lens group L4, the fifth lens group, and the sixth lens group L6 form a subsequent group. During zooming from the wide-angle end to the telephoto end, all lens groups except the second lens group L2 move toward the object side. The second lens group L2 is composed of, from the object side to the image side, three lenses with positive, negative, and negative refractive powers, and remains fixed during zooming. Image blur correction is performed by moving the three lenses (image blur correction lens group IS) that make up the second lens group L2 in a direction approximately perpendicular to the optical axis OA. When focusing from infinity to a close distance, the fifth lens group L5 moves toward the image side (FOCUS). The aperture diaphragm SP, which determines the Fno, is located closest to the image side of the third lens group L3.

[0022] The zoom lens 1b of Example 2 is a six-group zoom lens. From the object side to the image side, the zoom lens 1b is composed of a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L3 with positive refractive power, a fourth lens group L4 with positive refractive power, a fifth lens group L5 with negative refractive power, and a sixth lens group L6 with negative refractive power. The third lens group L3, the fourth lens group L4, the fifth lens group, and the sixth lens group L6 form a subsequent group. During zooming from the wide-angle end to the telephoto end, all lens groups except the second lens group L2 move toward the object side. The second lens group L2 is composed of four lenses with positive, negative, negative, and negative refractive powers, from the object side to the image side, and remains fixed during zooming. Image blur correction is performed by moving the entire second lens group L2 (image blur correction lens group IS) in a direction approximately perpendicular to the optical axis OA. When focusing from infinity to a close distance, the fourth lens group L4 moves toward the image side (FOCUS). An aperture diaphragm SP, which determines the Fno, is located inside the third lens group L3.

[0023] The zoom lens 1c of Example 3 is a three-group zoom lens. The zoom lens 1c is composed of, from the object side to the image side, a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, and a third lens group L3 with positive refractive power. The third lens group L3 is a rear group. When zooming from the wide-angle end to the telephoto end, all lens groups except the second lens group L2 move toward the object side. The second lens group L2 remains stationary during zooming. The second lens group L2 is composed of five lenses with, from the object side to the image side, positive, negative, negative, negative, and positive refractive powers. Image blur correction is performed by moving the three lenses (negative, negative, and positive) on the image side of the second lens group L2 (image blur correction lens group IS) in a direction perpendicular to the optical axis OA. When focusing from infinity to a close distance, two lenses with positive and negative refractive powers, the eighth and ninth lenses counting from the object side in the third lens unit L3, move toward the image side (FOCUS). In addition, the aperture stop SP, which determines the Fno, is located inside the third lens unit L3.

[0024] The zoom lens 1d of Example 4 is a six-group zoom lens. From the object side to the image side, the zoom lens 1d is composed of a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L3 with positive refractive power, a fourth lens group L4 with positive refractive power, a fifth lens group L5 with negative refractive power, and a sixth lens group L6 with negative refractive power. The third lens group L3, the fourth lens group L4, the fifth lens group, and the sixth lens group L6 form a subsequent group. During zooming from the wide-angle end to the telephoto end, all lens groups except the second lens group L2 move toward the object side. The second lens group L2 remains stationary during zooming. The second lens group L2 is composed of, from the object side to the image side, two lenses with positive and negative refractive powers. Image blur correction is performed by moving the entire second lens group L2 (image blur correction lens group IS) in a direction perpendicular to the optical axis OA. When focusing from infinity to a close distance, the fifth lens unit L5 moves toward the object side (FOCUS). The aperture stop SP, which determines the Fno, is located inside the third lens unit L3.

[0025] The zoom lens 1e of Example 5 is a seven-group zoom lens. The zoom lens 1e is composed of, in order from the object side, a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L3 with negative refractive power, a fourth lens group L4 with positive refractive power, a sixth lens group L6 with negative refractive power, and a seventh lens group L7 with negative refractive power. The third lens group L3, the fourth lens group L4, the fifth lens group, the sixth lens group L6, and the seventh lens group L7 form a subsequent group. During zooming from the wide-angle end to the telephoto end, the first lens group L1 and the fourth lens group L4 to the seventh lens group L7 move toward the object side. The third lens group L3 moves toward the image side. The second lens group L2 remains stationary during zooming. The second lens group L2 is composed of three lenses, with positive, negative, and negative refractive powers, in that order from the object side to the image side, and image blur is corrected by moving the entire second lens group L2 (image blur correction lens group IS) in a direction approximately perpendicular to the optical axis OA. When focusing from infinity to a close distance, the sixth lens group L6 moves (FOCUS).

[0026] The zoom lens of each embodiment performs zooming by moving a subsequent group consisting of a first lens group L1 and multiple lens groups (such as a third lens group L3) closer to the image than the second lens group L2. When zooming from the wide-angle end to the telephoto end, the first lens group L1 moves toward the object, thereby reducing the effective diameter of the front lens at the wide-angle end and achieving a desired zoom ratio. Furthermore, by keeping the second lens group L2, which has a strong negative refractive power, fixed during zooming, it is possible to reduce wobble caused by manufacturing errors.

[0027] In each embodiment, image blur correction is performed by moving (decentring) all or part of the second lens group L2 (at least part of the second lens group L2) in a direction substantially perpendicular to the optical axis OA (a direction including a vertical component). By providing an image blur correction lens group (image blur correction lens group) in the second lens group L2, which does not move during zooming, tilt of the second lens group L2 due to manufacturing errors can be suppressed, resulting in excellent image blur correction optical performance. Furthermore, by arranging a positive lens closest to the object in the second lens group L2, the diameter of the image blur correction lens group can be reduced. Furthermore, the telephoto arrangement at the telephoto end is strengthened, which is advantageous for reducing the overall lens length. Furthermore, by arranging a positive lens in the second lens group L2, which has negative refractive power, chromatic aberration of magnification at the wide-angle end and fluctuations in chromatic aberration during image blur correction can be suppressed.

[0028] In each embodiment, the first lens unit L1 has a larger lens unit thickness than conventional zoom lenses, and the number of lenses in the first lens unit L1 and the second lens unit L2 is reduced, which makes it possible to achieve both aberration correction, particularly at the telephoto end, and a reduction in the mass of the zoom lens (entire system).

[0029] The lens group (focus lens group) that moves during focusing is generally driven via an actuator such as a motor. This makes it easy to drive it with a different movement amount from the lens group that moves integrally during zooming, and in all embodiments except for Example 3, the focus lens group is an independently moving group. This makes it easy to suppress fluctuations in field curvature aberrations that occur during zooming and focusing.

[0030] In each embodiment, when the group thickness of the second lens unit L2 is D2 and the focal length of the zoom lens at the telephoto end is ft, the following conditional expression (1) is satisfied.

[0031] 0.003 <D2 / ft<0.026 ···(1) Conditional formula (1) defines the relationship between the group thickness D2 of the second lens unit L2 and the focal length ft of the zoom lens at the telephoto end in order to maintain a lightweight vibration-reduction lens unit and good vibration-reduction optical performance. If the group thickness D2 of the second lens unit L2 increases beyond the upper limit of conditional formula (1), the vibration-reduction lens unit provided in the second lens unit L2 becomes large, which is undesirable from the perspective of compactness and lightness. Alternatively, if the upper limit of conditional formula (1) is exceeded and the focal length ft becomes short, it becomes impossible to obtain a desired telephoto angle of view, which is undesirable. On the other hand, if the group thickness D2 of the second lens unit L2 decreases beyond the lower limit of conditional formula (1), the group thickness D2 becomes too small to accommodate a sufficient number of lenses, which makes it difficult to achieve vibration-reduction optical performance, particularly suppressing decentering coma and decentering curvature aberration, which is undesirable. Alternatively, if the focal length ft becomes large beyond the lower limit of conditional expression (1), it becomes difficult to suppress the axial chromatic aberration or chromatic aberration of magnification that occurs at the telephoto end, which is undesirable.

[0032] Preferably, the numerical range of conditional expression (1) is set as shown in the following conditional expression (1a).

[0033] 0.008 <D2 / ft<0.025 ···(1a) More preferably, the numerical range of conditional expression (1) is set as in the following conditional expression (1b).

[0034] 0.010 <D2 / ft<0.025 ···(1b) In each embodiment, it is preferable to satisfy at least one of the following conditional expressions (2) to (11).

[0035] -1.00 <f2 / fw<-0.20 ···(2) 3.0 <D1 / D2<30.0 ···(3) 3.0 <TD12t / TG12<15.0 ···(4) 1.00 <ft / TTDw<3.50 ···(5) 8.0 <ft / skw<35.0 ···(6) 5 <TTDw / skw<20 ···(7) 0.10 <m1 / f1<0.50 ···(8) 1.00 <f1 / fw<3.00 ···(9) -6.0<(1-βist)βrt<-2.0 ···(10) 4.0<|(1-βft 2 )β f rt 2 |<20.0 ···(11) Here, the focal length of the second lens group L2 is f2, the focal length of the zoom lens at the wide-angle end is fw, and the group thickness of the first lens group L1 is D1. The distance from the lens surface of the first lens group L1 closest to the object to the lens surface of the second lens group L2 closest to the image at the telephoto end is TD12t, and the sum of the lens thicknesses of the first lens group L1 and the second lens group L2 on the optical axis is TG12. The total optical length (total lens length) from the lens surface closest to the object to the image plane at the wide-angle end is TTDw, and the back focus at the wide-angle end is skw. The movement amount of the first lens group L1 during zooming from the wide-angle end to the telephoto end is m1. The focal length of the first lens group L1 is f1, the lateral magnification at the telephoto end of the image stabilization lens group in the second lens group L2 that performs image blur correction is βist, and the combined lateral magnification at the telephoto end of all lens groups positioned closer to the image than the image stabilization lens group is βrt. The lateral magnification of the focus lens group at the telephoto end is βft, and the combined lateral magnification of all lens groups located on the image side of the focus lens group at the telephoto end is β f Let's call it rt.

[0036] The total optical length TTDw at the wide-angle end is the distance from the first lens surface closest to the object to the last lens surface plus the value of the back focus in air. Back focus is the air-equivalent length from the last lens surface to the image plane IP. The zooming movement amount (the amount of movement of a lens group during zooming) corresponds to the difference between its position on the optical axis at the wide-angle end and its position on the optical axis at the telephoto end. The sign of the movement amount is positive when the lens group is closer to the image at the telephoto end than at the wide-angle end, and negative when the lens group is closer to the object at the telephoto end than at the wide-angle end.

[0037] Conditional formula (2) is a conditional formula for achieving both a small overall lens length and good optical performance by appropriately setting the focal length f2 of the second lens unit L2. If the lower limit of conditional formula (2) is exceeded and the focal length f2 becomes too long, it is necessary to increase the amount of movement of the first lens unit L1 or the third lens unit L3 to achieve the desired zoom magnification, which is undesirable because it makes it difficult to reduce the overall lens length. Furthermore, the negative refractive power of the entire zoom lens system weakens, which tends to increase the Petzval sum in the positive direction, which is undesirable from the perspectives of astigmatism and field curvature. Alternatively, if the focal length fw becomes too short, the refractive power of the negative lens unit ahead of the aperture stop SP becomes too strong, which makes it difficult to achieve the desired optical performance and also leads to an increase in the front lens diameter, which is undesirable. On the other hand, if the upper limit of conditional expression (2) is exceeded and the focal length f2 becomes too short, the refractive power of the second lens unit L2 becomes too strong, which tends to increase the outer diameter of subsequent lens units such as the third lens unit L3 or the focus lens unit, which is undesirable from the perspective of compactness. Also, if the focal length f2 becomes too short, in order to reduce the overall lens length at the wide-angle end, it is necessary to increase the positive refractive power of the fourth lens unit L4 and subsequent lens units, which makes it difficult to correct axial aberrations such as spherical aberration, which is undesirable. Alternatively, the focal length fw becomes too long, which is undesirable because it makes it impossible to obtain the desired wide-angle end focal length.

[0038] Conditional expression (3) defines the ratio of the group thickness D1 of the first lens group from the object plane to the image plane IP to the group thickness D2 for appropriate aberration correction. Here, the group thickness includes the air spacing between the lenses constituting the group. If the first lens group thickness D1 increases beyond the upper limit of conditional expression (3), the diameter of the first lens group L1 in particular increases, which is undesirable from the perspective of compactness and weight reduction. Conversely, if the group thickness D2 decreases beyond the upper limit of conditional expression (3), it becomes difficult to reduce the number of lenses in the second lens group L2 with negative refractive power and to correct various aberrations in each lens group. This makes it particularly difficult to correct spherical aberration at the telephoto end and lateral chromatic aberration and coma at the wide-angle end, which is undesirable. On the other hand, if the group thickness D1 decreases beyond the lower limit of conditional expression (3), it becomes undesirable because it becomes difficult to adequately correct spherical aberration or chromatic aberration at the telephoto end. Alternatively, if the group thickness D2 increases beyond the lower limit of conditional expression (3), the amount of zooming movement of the subsequent group decreases, and the overall length of the entire zoom lens system must be increased to obtain the desired magnification, which is undesirable.

[0039] Conditional expression (4) defines the relationship between the distance TD12t and the sum TG12 to simultaneously suppress various aberrations at the telephoto end and reduce the lens weight. Here, TG12 is the sum of the lens thicknesses of the first and second lens groups L1 and L2, not including the distance between the lenses. If the distance TD12t exceeds the upper limit of conditional expression (4), the overall lens length increases, which is undesirable. In particular, if the distance between the first and second lens groups L1 and L2, which perform the main magnification change, increases, the diameter of the first lens group L1 increases, which is undesirable from the perspective of portability. Alternatively, if the sum TG12 exceeds the upper limit of conditional expression (4), the number of lenses decreases, or it becomes difficult to provide each lens with sufficient refractive power. As a result, the correction of various aberrations at the telephoto end, particularly spherical aberration and chromatic aberration, becomes insufficient, which is undesirable.

[0040] On the other hand, if the distance TD12t becomes small by going below the lower limit of conditional expression (4), the telephoto arrangement of refractive power becomes too strong, resulting in insufficient correction of spherical aberration and chromatic aberration, which is undesirable from the viewpoint of performance. Alternatively, if the distance TD12t becomes large by going above the lower limit of conditional expression (4), this means that many lenses are arranged in the first lens group L1 and the second lens group L2. Therefore, this is undesirable from the viewpoint of weight reduction.

[0041] Conditional expression (5) defines the relationship between the total optical length TTDw and the desired focal length ft to achieve a compact overall lens length. If the focal length ft increases beyond the upper limit of conditional expression (5), the overall lens length becomes too short, increasing the need for an extreme telephoto arrangement of refractive power, which is undesirable from the perspective of aberration correction. Alternatively, if the total optical length TTDw increases beyond the upper limit of conditional expression (5), the first lens unit L1 must be extended significantly during zooming to adequately correct aberrations at the telephoto end, which increases the need for a more complex mechanical structure, which is undesirable. On the other hand, if the focal length ft decreases beyond the lower limit of conditional expression (5), the desired telephoto angle of view cannot be obtained, which is undesirable. Alternatively, if the total optical length TTDw increases beyond the lower limit of conditional expression (5), it becomes difficult to achieve a compact and lightweight zoom lens, which is undesirable.

[0042] Conditional expression (6) defines the relationship between the focal length ft and the back focal length skw at the wide-angle end in order to achieve both telephoto and compactness in the zoom lens. If the focal length ft increases beyond the upper limit of conditional expression (6), it becomes difficult to correct various aberrations, particularly axial chromatic aberration, at the telephoto end, which is undesirable. Alternatively, if the back focal length skw decreases, it becomes necessary to position the lens element near the image plane IP, which is undesirable from a mechanical layout perspective. On the other hand, if the back focal length skw increases beyond the lower limit of conditional expression (6), the final lens group becomes too close to the object side, which tends to make it difficult to suppress lateral chromatic aberration at the wide-angle end, which is undesirable. Alternatively, if the focal length ft decreases beyond the lower limit of conditional expression (6), it becomes difficult to achieve the desired focal length at the telephoto end, which is undesirable.

[0043] Conditional expression (7) defines the relationship between the total optical length TTDw of the zoom lens at the wide-angle end and the back focal length skw at the wide-angle end in order to achieve a zoom lens with a reduced overall length. If the total optical length TTDw of the zoom lens at the wide-angle end becomes longer than the upper limit of conditional expression (7), the reduction in the overall length of the zoom lens is not achieved, which is undesirable. Furthermore, if the back focal length skw becomes smaller than the upper limit of conditional expression (7), the mechanical layout of the connection between the lens and the camera becomes difficult. On the other hand, if the total length of the zoom lens becomes shorter than the lower limit of conditional expression (7), the positive refractive power of the entire zoom lens becomes too high, making it difficult to control the Petzval sum and achieving the desired optical performance. Furthermore, if the back focal length becomes larger than the lower limit of conditional expression (7), it is undesirable from the perspective of reducing the overall length.

[0044] Conditional expression (8) defines the movement amount m1 as the focal length f1 in order to achieve both a desired zoom magnification and compactness. If the movement amount m1 is increased beyond the lower limit of conditional expression (8), the effective diameter of the first lens group L1 becomes too large, which is undesirable from the perspective of compactness and lightweight design. Alternatively, if the focal length f1 is reduced beyond the lower limit of conditional expression (8), it becomes difficult to suppress aberrations occurring in the first lens group L1, particularly lateral chromatic aberration at the telephoto end. On the other hand, if the focal length f1 is increased beyond the upper limit of conditional expression (8), it becomes necessary to position the first lens group L1 farther away from the second lens group L2 to achieve telephoto mode, which increases the diameter of the front lens element. Therefore, this is undesirable from the perspective of compactness and lightweight design. Alternatively, if the movement amount m1 is reduced beyond the upper limit of conditional expression (8), it becomes difficult to obtain the desired focal length at the telephoto end, or the movement amount of the subsequent lens group becomes large to obtain the desired focal length, making it difficult to suppress zoom fluctuations such as field curvature aberration, which is undesirable.

[0045] Conditional expression (9) defines the focal lengths fw and f1 required to achieve the required zoom magnification. If the upper limit of conditional expression (9) is exceeded and the focal length f1 becomes large, the amount of movement of the first lens unit L1 during zooming increases, undesirably increasing the overall length. On the other hand, if the lower limit of conditional expression (9) is exceeded and the focal length f1 becomes small, undesirably correcting spherical aberration and coma with a small number of lenses becomes difficult. Furthermore, the focal length on the wide-angle side becomes long, undesirably making it difficult to achieve the desired zoom magnification.

[0046] Conditional expression (10) defines the relationship between the lateral magnification βist and the composite lateral magnification βrt in order to compensate for image vibration with an appropriate amount of decentering of the image stabilization lens group. Conditional expression (10) represents the so-called image stabilization sensitivity, which expresses the amount of decentering of the image stabilization lens group IP relative to the amount of decentering of the image stabilization lens group at the telephoto end. If the image stabilization sensitivity of the image stabilization lens group increases beyond the upper limit of conditional expression (10), the amount of decentering during image stabilization can be suppressed, which is advantageous for reducing the size of the image stabilization unit. However, if the image stabilization sensitivity is too high, decentering coma aberrations and other aberrations will occur if the image stabilization lens group becomes decentered due to manufacturing errors or other reasons even when image blur is not occurring, which is undesirable. Furthermore, mechanical control of the amount of decentering during image stabilization will be difficult. On the other hand, if the lower limit of conditional expression (10) is exceeded and the decentering sensitivity of the image blur correction lens group IS becomes small, the amount of decentering of the image blur correction lens group must be increased in order to obtain a sufficient image blur correction angle, which undesirably leads to an increase in the size of the image blur correction unit.

[0047] Condition (11) is to achieve good focusing performance by setting the lateral magnification βft and the combined lateral magnification β fThis defines the relationship between rt and rt. Conditional expression (11) is the exact equation for focus sensitivity at the telephoto end. If the upper limit of conditional expression (11) is exceeded and focus sensitivity becomes high, it becomes difficult to mechanically control the focus lens group, which is undesirable. Furthermore, the refractive power of the focus lens group tends to increase, making it difficult to ensure sufficient optical performance when photographing at close range, which is undesirable. On the other hand, if the lower limit of conditional expression (11) is exceeded and focus sensitivity becomes low, the amount of movement during focusing increases, which tends to increase the mechanical layout, which is undesirable from the perspective of compactness.

[0048] In each embodiment, it is more preferable that at least one of the numerical ranges of conditional expressions (2) to (11) is set as in the following conditional expressions (2a) to (11a), respectively.

[0049] -0.75 <f2 / fw<-0.25 ···(2a) 3.3 <D1 / D2<25.0 ···(3a) 4.0 <TD12t / TG12<12.0 ···(4a) 1.50 <ft / TTDw<3.00 ···(5a) 12.0 <ft / skw<30.0 ···(6a) 6.0 <TTDw / skw<15.0 ···(7a) 0.15 <m1 / f1<0.40 ···(8a) 1.20 <f1 / fw<2.80 ···(9a) -5.0<(1-βist)βrt<-2.5 (10a) 5.0<|(1-βft 2 )β f rt 2 |<15.0 ···(11a) In each embodiment, it is more preferable that at least one of the numerical ranges of conditional expressions (2) to (11) is set as shown in the following conditional expressions (2b) to (11b), respectively.

[0050] -0.50 <f2 / fw<-0.35 ···(2b) 3.8 <D1 / D2<21.0 ···(3b) 5.6 <TD12t / TG12<9.5 ···(4b) 1.80 <ft / TTDw<2.75 ···(5b) 15.0 <ft / skw<26.0 ···(6b) 8.5 <TTDw / skw<9.5 ···(7b) 0.25 <m1 / f1<0.36 ···(8b) 1.40 <f1 / fw<2.55 ···(9b) -4.5<(1-βist)βrt<-3.2 (10b) 6.0<|(1-βft 2 )β f rt 2 |<13.0 ···(11b) In each embodiment, the second lens group L2 tends to have a strong negative refractive power, and therefore preferably has two or more lenses from the viewpoint of aberration correction. More preferably, from the viewpoint of vibration-proof optical performance, the entire second lens group L2 is set as a vibration-proof lens group, and the second lens group is made up of three lenses, positive, negative, and negative, in that order from the object side.

[0051] In each embodiment, the first lens unit L1 is preferably composed of three or more lenses, from the viewpoint of achieving good spherical aberration correction at the telephoto end. More preferably, from the viewpoint of achieving both good aberration correction and a shorter overall length, the first lens unit L1 is composed of, in order from the object side to the image side, a positive lens, a positive lens, and a negative lens.

[0052] The lens group subsequent to the third lens group L3 includes, in order from the object side to the image side, a fourth lens group L4 having positive refractive power, a fifth lens group L5 having negative refractive power, and a sixth lens group L6 having negative refractive power, which enables a multi-group telephoto configuration to be adopted, which is preferable from the perspective of compactness at the telephoto end.

[0053] In each embodiment, in order to suppress image plane distortion or distortion, it is preferable that an aperture stop SP for determining the F-number be located inside the third lens unit L3 or on the image side of the third lens unit L3. In each embodiment, from the viewpoints of manufacturing cost and manufacturing error, it is preferable that all of the lenses constituting the lens unit be spherical lenses. In each embodiment, from the viewpoint of reducing focus weight, it is preferable that the focus lens unit be located after the fourth lens unit L4, which is closer to the image side than the third lens unit L3.

[0054] According to each embodiment, it is possible to provide a lightweight and compact zoom lens while maintaining high optical performance during image blur correction at the telephoto end. [Imaging device] Next, with reference to FIG. 21, an imaging device (digital still camera) 10 equipped with a zoom lens according to each embodiment will be described. FIG. 21 is a schematic diagram of the imaging device 10. The imaging device 10 includes a camera body 13, a lens device 11 including any one of the zoom lenses (1a to 1e) according to Embodiments 1 to 5, and an imaging element 12 that photoelectrically converts an image formed by the zoom lens. The imaging element 12 is a photoelectric conversion element such as a CCD sensor or a CMOS sensor. The lens device 11 and the camera body 13 may be configured as an integrated unit, or may be configured as detachable components. The camera body 13 may be a so-called single-lens reflex camera with a quick-turn mirror, or a so-called mirrorless camera without a quick-turn mirror. By applying the zoom lens according to each embodiment to the imaging device 10 in this manner, a compact imaging device can be obtained.

[0055] Numerical Examples 1 to 5 corresponding to Examples 1 to 5, respectively, are shown below. In the surface data of each numerical example, r represents the radius of curvature of each optical surface, and d (mm) represents the axial distance (distance on the optical axis) between the mth surface and the (m+1)th surface. Here, m is the surface number counted from the light incident side. Furthermore, nd represents the refractive index of each optical member with respect to the d-line, and vd represents the Abbe number of the optical member. Note that the Abbe number vd of a certain material is given by the following when the refractive indices at the d-line (587.6 nm), F-line (486.1 nm), and C-line (656.3 nm) of the Fraunhofer lines are Nd, NF, and NC, respectively: νd=(Nd-1) / (NF-NC) It is expressed as:

[0056] In each numerical example, d, focal length (mm), F-number, and half angle of view (degrees) are all values ​​when the optical system of each example is focused on an object at infinity. "Back focus BF" is the distance on the optical axis from the final lens surface (the lens surface closest to the image) to the paraxial image plane, expressed as an air-equivalent length. "Total lens length" is the distance on the optical axis from the frontmost lens surface (the lens surface closest to the object) of the zoom lens to the final lens surface plus the back focus. "Lens group" is not limited to cases where it is composed of multiple lenses, but also includes cases where it is composed of a single lens.

[0057] Furthermore, if the optical surface is aspherical, an * symbol is added to the right of the surface number. The aspherical shape is expressed by the following equation, where x is the displacement from the vertex of the surface in the optical axis direction, h is the height from the optical axis in a direction perpendicular to the optical axis, R is the paraxial radius of curvature, k is the conic constant, and A4, A6, A8, A10, and A12 are aspherical coefficients of each order.

[0058] x=(h 2 / R) / [1+{1-(1+k)(h / R) 2} 1 / 2 +A4×h 4 +A6×h 6 +A8×h 8 +A10×h 10 +A12×h 12 In addition, "e±XX" in each aspherical coefficient is "×10± XX " means.

[0059] Table 1 shows the relationship between the above-mentioned conditional expressions and the respective numerical examples.

[0060] (Numerical Example 1) Unit: mm Surface Data Surface number rd nd νd 1 208.140 8.30 1.48749 70.2 2 -575.227 39.20 3 117.400 11.35 1.49700 81.5 4 -270.733 2.70 1.61340 44.3 5 154.413 (variable) 6 -1313.396 3.50 1.80518 25.4 7 -65.332 1.40 1.77250 49.6 8 114.681 2.08 9 -137.293 1.40 1.83481 42.7 10 893.658 (variable) 11 48.839 8.05 1.49700 81.5 12 -79.168 0.55 13 301.466 1.35 1.77250 49.6 14 27.972 5.77 1.54072 47.2 15 776.993 0.48 16 93.677 6.14 1.51823 58.9 17 -33.663 1.30 1.77250 49.6 18 -558.826 6.04 19 (Aperture) ∞ (Variable) 20 71.179 1.30 2.00069 25.5 21 35.239 4.65 1.61340 44.3 22 -67.501 (variable) 23 112.661 2.56 1.51742 52.4 24 -88.341 1.22 25 -100.206 0.90 1.59522 67.7 26 29.728 (variable) 27 -43.800 1.30 1.49700 81.5 28 43.800 4.30 1.72047 34.7 29 -576.993 (variable) Image plane ∞ Various data Zoom ratio 3.82 Wide-angle Mid-range Telephoto Focal length 203.00 390.84 776.00 F-number 6.42 7.30 9.18 Half angle of view 6.08 3.17 1.60 Image height 21.64 21.64 21.64 Lens total length 331.63 390.98 421.61 BF 37.98 61.62 96.27 d 5 39.49 98.84 129.47 d10 43.89 32.37 3.29 d19 46.32 45.47 47.31 d22 21.38 12.89 3.01 d26 26.74 23.95 26.42 d29 37.98 61.62 96.27 Zoom lens group data Group starting plane focal length 1 1 302.68 2 6 -71.48 3 11 99.38 4 20 82.71 5 23 -66.78 6 27 -203.48 (Numerical Example 2) Unit: mm Surface Data Surface number rd nd νd 1 536.590 4.83 1.48749 70.2 2∞0.30 3 251.106 8.46 1.49700 81.5 4 -1673.790 61.51 5 91.050 12.15 1.49700 81.5 6 -1226.452 2.70 1.61340 44.3 7 100.224 (variable) 8 624.330 4.93 1.84666 23.8 9 -101.074 1.60 1.58267 46.4 10 -8474.517 0.82 11 -225.063 1.50 1.83481 42.7 12 107.177 5.01 13 -106.688 1.50 1.83481 42.7 14 -376.854 (variable) 15 49.123 10.11 1.49700 81.5 16 -99.750 0.55 17 167.936 1.35 1.77250 49.6 18 29.139 7.38 1.54072 47.2 19 362.505 0.45 20 108.905 7.67 1.51823 58.9 21 -35.539 1.30 1.77250 49.6 22 -596.731 8.02 23 (Aperture) ∞ (Variable) 24 61.937 1.30 2.00069 25.5 25 33.846 4.68 1.61340 44.3 26 -84.841 (variable) 27 -88.686 1.48 1.51742 52.4 28 -70.843 0.15 29 206.943 0.90 1.59522 67.7 30 29.471 (variable) 31 -44.298 1.30 1.49700 81.5 32 46.471 4.98 1.72047 34.7 33 -177.536 (variable) Image plane ∞ Various data Zoom ratio 3.45 Wide-angle Mid-range Telephoto Focal length 203.00 500.93 699.99 F-number 5.60 6.34 7.10 Half angle of view 6.08 2.47 1.77 Image height 21.64 21.64 21.64 Lens total length 347.80 433.60 447.80 BF 38.65 74.20 94.84 d 7 7.80 93.60 107.80 d14 48.87 31.25 14.64 d23 45.93 45.36 46.42 d26 21.43 7.99 3.00 d30 28.22 24.28 24.19 d33 38.65 74.20 94.84 Zoom lens group data Group starting plane focal length 1 1 329.62 2 8 -76.52 3 15 100.07 4 24 84.13 5 27 -63.08 6 31 -456.32 (Numerical Example 3) Unit: mm Surface Data Surface number rd nd νd 1 239.499 6.41 1.48749 70.2 2 -682.613 39.20 3 383.309 6.65 1.49700 81.5 4 -198.255 2.00 1.61340 44.3 5 606.142 (variable) 6 348.709 2.47 1.72322 28.3 7 -138.862 0.00 8 -138.862 1.50 1.78320 48.3 9 -529.645 1.77 10 342.121 1.00 1.83481 42.7 11 86.145 3.07 12 -77.314 1.40 1.77250 49.6 13 76.558 2.92 1.83899 33.6 14 -2475.163 (variable) 15 45.295 8.27 1.49700 81.5 16 -85.968 0.55 17 187.609 1.35 1.77250 49.6 18 25.519 6.17 1.54072 47.2 19 244.166 0.45 20 67.987 7.13 1.51823 58.9 21 -31.867 1.30 1.77250 49.6 22 786.113 20.13 23 (Aperture) ∞ 18.06 24 144.798 1.30 2.00069 25.5 25 51.669 5.42 1.61340 44.3 26 -55.655 17.46 27 -69.421 2.01 1.51742 52.4 28 -39.772 10.00 29 -35.157 0.90 1.59522 67.7 30 -1176.924 26.96 31 -38.517 1.30 1.49700 81.5 32 48.580 3.66 1.72047 34.7 33 -489.785 (variable) Image plane ∞ Various data Zoom ratio 3.78 Wide-angle Mid-range Telephoto Focal length 158.88 299.63 600.00 F-number 5.89 7.47 9.18 Half angle of view 7.75 4.13 2.07 Image height 21.64 21.64 21.64 Lens total length 332.30 388.15 447.10 BF 38.50 64.61 92.00 d 5 37.49 93.34 152.29 d14 55.50 29.40 2.00 d33 38.50 64.61 92.00 Zoom lens group data Group starting plane focal length 1 1 398.74 2 6 -78.16 3 15 58.77 (Numerical Example 4) Unit: mm Surface Data Surface number rd nd νd 1 186.469 9.88 1.48749 70.2 2 -726.912 39.20 3 177.233 10.76 1.49700 81.5 4 -193.647 2.70 1.61340 44.3 5 242.431 (variable) 6* -142.676 2.27 1.84666 23.8 7 -63.835 0.80 1.77250 49.6 8 109.425 (variable) 9 61.333 7.63 1.49700 81.5 10 -92.115 0.55 11 1476.984 1.35 1.77250 49.6 12 34.399 5.97 1.54072 47.2 13 -351.449 0.45 14 108.611 5.56 1.51823 58.9 15 -45.439 1.30 1.77250 49.6 16 -921.975 6.06 17 (Aperture) ∞ (Variable) 18 68.543 1.30 2.00069 25.5 19 34.997 4.20 1.61340 44.3 20 -76.767 (variable) 21 -37.068 1.34 1.51742 52.4 22 -35.632 0.15 23 117.721 0.90 1.59522 67.7 24 29.286 (variable) 25 -43.555 1.30 1.49700 81.5 26 43.555 5.02 1.72047 34.7 27 -318.157 (variable) Image plane ∞ Aspheric data Page 6 K = 0.00000e+00 A 4= 2.45350e-07 A 6=-4.04728e-11 A 8= 1.59426e-14 Various data Zoom ratio 3.82 Wide-angle Mid-range Telephoto Focal length 203.00 389.29 776.00 F-number 6.43 6.96 9.18 Half angle of view 6.08 3.18 1.60 Image height 21.64 21.64 21.64 Lens total length 332.30 408.08 437.94 BF 37.00 54.05 97.68 d 5 27.42 103.19 133.06 d 8 45.45 39.63 4.42 d17 59.88 58.99 60.55 d20 25.74 13.62 3.00 d24 28.13 29.92 30.55 d27 37.00 54.05 97.68 Zoom lens group data Group starting plane focal length 1 1 318.12 2 6 -84.10 3 9 110.21 4 18 87.13 5 21 -68.28 6 25 -256.33 (Numerical Example 5) Unit: mm Surface Data Surface number rd nd νd 1 268.457 11.38 1.48749 70.2 2 -497.277 12.61 3 152.103 14.80 1.43875 94.7 4 -445.928 2.70 1.61340 44.3 5 245.757 (variable) 6 -2147.592 3.90 1.76182 26.5 7 -68.466 1.40 1.77250 49.6 8 140.459 1.64 9 -313.103 1.40 1.83481 42.7 10 360.786 (variable) 11 -264.245 1.40 1.90525 35.0 12 470.676 0.38 13 298.312 1.93 1.80810 22.8 14 -3695.446 (variable) 15 44.959 9.19 1.49700 81.5 16 -99.933 0.55 17 157.984 1.35 1.77250 49.6 18 27.027 6.73 1.54072 47.2 19 354.035 0.45 20 80.294 7.02 1.51823 58.9 21 -34.972 1.30 1.77250 49.6 22 422.356 5.21 23 (Aperture) ∞ (Variable) 24 66.490 1.30 2.00069 25.5 25 35.232 4.55 1.61340 44.3 26 -79.073 (variable) 27 716.730 2.10 1.51742 52.4 28 -85.930 1.09 29 -125.479 0.90 1.59522 67.7 30 33.062 (variable) 31 -43.468 1.30 1.49700 81.5 32 56.190 4.16 1.72047 34.7 33 -191.732 (variable) Image plane ∞ Various data Zoom ratio 4.90 Wide-angle Mid-range Telephoto Focal length 199.98 390.17 980.38 F-number 6.43 6.24 9.18 Half angle of view 6.17 3.17 1.26 Image height 21.64 21.64 21.64 Lens total length 362.79 455.26 482.80 BF 38.64 40.95 100.15 d 5 67.97 160.43 187.98 d10 2.00 6.44 8.67 d14 55.86 55.47 0.98 d23 40.86 41.03 45.75 d26 23.33 11.25 2.00 d30 33.37 38.91 36.52 d33 38.64 40.95 100.15 Zoom lens group data Group starting plane focal length 1 1 337.22 2 6 -90.35 3 11 -414.51 4 15 104.37 5 24 85.07 6 27 -63.29 7 31 -281.32

[0061] [Table 1]

[0062] The disclosure of each embodiment includes the following configuration.

[0063] (Configuration 1) A zoom lens having a plurality of lens groups, the plurality of lens groups are arranged in order from the object side to the image side, and include a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a subsequent group consisting of one or more lens groups; The distance between adjacent lens groups changes during zooming, and the second lens group remains stationary during zooming; During image blur correction, at least a part of the second lens group moves in a direction including a component perpendicular to the optical axis, When the group thickness of the second lens group is D2 and the focal length of the zoom lens at the telephoto end is ft, 0.003 <D2 / ft<0.026 A zoom lens characterized by satisfying the following conditional expressions: (Configuration 2) When the focal length of the second lens group is f2, -1.00 <f2 / fw<-0.20 2. The zoom lens according to claim 1, wherein the following condition is satisfied: (Configuration 3) When the group thickness of the first lens group is D1, 3.0 <D1 / D2<30.0 3. The zoom lens according to configuration 1 or 2, wherein the following condition is satisfied: (Configuration 4) When the distance from the lens surface of the first lens group closest to the object side to the lens surface of the second lens group closest to the image side at the telephoto end is TD12t and the sum of the lens thicknesses of the first lens group and the second lens group on the optical axis is TG12, 3.0 <TD12t / TG12<15.0 4. The zoom lens according to any one of the configurations 1 to 3, wherein the following condition is satisfied: (Configuration 5) When the total optical length from the lens surface closest to the object side of the zoom lens at the wide-angle end to the image plane is TTDw, 1.00 <ft / TTDw<3.50 5. The zoom lens according to any one of the first to fourth aspects, wherein the following condition is satisfied: (Configuration 6) When the back focus at the wide-angle end is skw, 8.0 <ft / skw<35.0 6. A zoom lens according to any one of configurations 1 to 5, wherein the following condition is satisfied: (Configuration 7) When the total optical length from the lens surface closest to the object side of the zoom lens at the wide-angle end to the image plane is TTDw and the back focus at the wide-angle end is skw, 5 <TTDw / skw<20 10. The zoom lens according to any one of configurations 1 to 6, wherein the following condition is satisfied: (Configuration 8) When the movement amount of the first lens group during zooming from the wide-angle end to the telephoto end is m1 and the focal length of the first lens group is f1, 0.10 <m1 / f1<0.50 8. The zoom lens according to any one of configurations 1 to 7, wherein the following condition is satisfied: (Configuration 9) When the focal length of the zoom lens at the wide-angle end is fw and the focal length of the first lens group is f1, 1.00 <f1 / fw<3.00 9. A zoom lens according to any one of configurations 1 to 8, wherein the following condition is satisfied: (Configuration 10) Let β be the lateral magnification at the telephoto end of the vibration-reduction lens group that performs the image blur correction in the second lens group, and β be the combined lateral magnification at the telephoto end of all lens groups that are arranged closer to the image side than the vibration-reduction lens group, -6.0<(1-βist)βrt<-2.0 10. The zoom lens according to any one of configurations 1 to 9, wherein the following condition is satisfied: (Configuration 11) the subsequent lens group has a focus lens group that moves during focusing, The lateral magnification at the telephoto end of the focus lens group is βft, and the combined lateral magnification at the telephoto end of all lens groups arranged on the image side of the focus lens group is β f When rt is used, 4.0<|(1-βft 2 )β f rt 2 |<20.0 11. The zoom lens according to any one of configurations 1 to 10, wherein the following condition is satisfied: (Configuration 12) 12. The zoom lens according to any one of configurations 1 to 11, wherein the first lens group is made up of lenses having positive, positive, and negative refractive powers, arranged in this order from the object side to the image side. (Configuration 13) the second lens group is composed of lenses having positive, negative and negative refractive powers, arranged in this order from the object side to the image side, 13. A zoom lens according to any one of configurations 1 to 12, wherein the entire second lens group is an image stabilizing lens group that performs the image blur correction. (Configuration 14) The zoom lens according to any one of configurations 1 to 13, wherein the subsequent group comprises a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, a fifth lens group having a negative refractive power, and a sixth lens group having a negative refractive power. (Configuration 15) 15. A zoom lens according to any one of configurations 1 to 14, further comprising an aperture stop arranged inside a third lens group constituting the subsequent group or on the image side of the third lens group. (Configuration 16) 16. The zoom lens according to any one of configurations 1 to 15, wherein all of the lenses constituting the zoom lens are spherical lenses. (Configuration 17) a zoom lens according to any one of configurations 1 to 16; an image sensor that receives an image formed by the zoom lens.

[0064] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist of the present invention. [Explanation of symbols]

[0065] 1a~1e Zoom Lens L1 First lens group L2 Second lens group L3: 3rd lens group (subsequent group) L4 4th lens group (subsequent group) L5 5th lens group (subsequent group) L6 6th lens group (subsequent group) L7 7th lens group (subsequent group)

Claims

1. A zoom lens having a plurality of lens groups, the plurality of lens groups are arranged in order from the object side to the image side, and include a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a subsequent group consisting of one or more lens groups; The distance between adjacent lens groups changes during zooming, and the second lens group remains stationary during zooming. During image blur correction, at least a part of the second lens group moves in a direction including a component perpendicular to the optical axis, the lens disposed closest to the object side in the second lens group has positive refractive power, In the second lens group, when the distance on the optical axis from the lens surface closest to the object to the lens surface closest to the image is D2 and the focal length of the zoom lens at the telephoto end is ft, 0.003<D2 / ft<0.026 A zoom lens characterized by satisfying the following conditional expressions:

2. When the focal length of the second lens group is f2, -1.00<f2 / fw<-0.20 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

3. When the group thickness of the first lens group is D1, 3.0<D1 / D2<30.0 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

4. When the distance from the lens surface of the first lens group closest to the object side to the lens surface of the second lens group closest to the image side at the telephoto end is TD12t and the sum of the lens thicknesses of the first lens group and the second lens group on the optical axis is TG12, 3.0<TD12t / TG12<15.0 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

5. When the total optical length from the lens surface closest to the object side of the zoom lens at the wide-angle end to the image plane is TTDw, 1.00<ft / TTDw<3.50 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

6. When the back focus at the wide-angle end is skw, 8.0<ft / skw<35.0 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

7. When the total optical length from the lens surface closest to the object side of the zoom lens at the wide-angle end to the image plane is TTDw and the back focus at the wide-angle end is skw, 5<TTDw / skw<20 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

8. When the movement amount of the first lens group during zooming from the wide-angle end to the telephoto end is m1 and the focal length of the first lens group is f1, 0.10<m1 / f1<0.50 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

9. When the focal length of the zoom lens at the wide-angle end is fw and the focal length of the first lens group is f1, 1.00<f1 / fw<3.00 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

10. When the lateral magnification at the telephoto end of the vibration-reduction lens group that performs the image blur correction in the second lens group is βist, and the combined lateral magnification at the telephoto end of all lens groups that are arranged closer to the image side than the vibration-reduction lens group is βrt, -6.0<(1-βist)βrt<-2.0 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

11. the subsequent lens group has a focus lens group that moves during focusing, When the lateral magnification at the telephoto end of the focus lens unit is βft and the combined lateral magnification at the telephoto end of all lens units arranged closer to the image than the focus lens unit is βfrt, 4.0<|(1-βft ２ )βfrt ２ |<20.0 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

12. 2. The zoom lens according to claim 1, wherein the first lens group comprises lenses having positive, positive and negative refractive powers, arranged in this order from the object side to the image side.

13. the second lens group is composed of lenses having positive, negative and negative refractive powers, arranged in this order from the object side to the image side, 2. The zoom lens according to claim 1, wherein the entire second lens group is an image stabilizing lens group that performs the image blur correction.

14. 2. The zoom lens according to claim 1, wherein the subsequent lens group comprises a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, a fifth lens group having a negative refractive power, and a sixth lens group having a negative refractive power.

15. 2. The zoom lens according to claim 1, further comprising an aperture stop arranged inside a third lens group constituting the subsequent group or on the image side of the third lens group.

16. 2. The zoom lens according to claim 1, wherein all of the lenses constituting the zoom lens are spherical lenses.

17. a zoom lens according to any one of claims 1 to 16; an image sensor that receives an image formed by the zoom lens.

Images