Zoom lens and imaging apparatus

Abstract

To reduce the size and weight of a lens group to be driven in a zoom lens.SOLUTION: The zoom lens L0 includes a negative first lens group, a positive intermediate group, and a negative subsequent group, and the intermediate group includes positive first and second intermediate lens groups. During zooming, the first lens unit is configured not to move, and the first and second intermediate lens units are configured to move. The first lens group includes two or more lenses. Where mp1 and mp2 are amounts of movement of the first and second intermediate lens units during zooming from the wide-angle end to the telephoto end, fp1 and fp2 are focal lengths of the first and second intermediate lens units, fw and ft are focal lengths of the zoom lens at the wide-angle end and the telephoto end, and TTLw is a sum of a distance from a lens surface closest to the object side to a lens surface closest to the image side at the wide-angle end and a distance from the lens surface closest to the image side to the image plane. 0.10 ≤ mp2 / mp1 ≤ 0.82, 1.23 ≤ fp2 / fp1 ≤ 10.00, 1.50 ≤ ft / fw ≤ 6.00, and 0.10 ≤ TTLw / fw ≤ 10.00 are satisfied.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a zoom lens suitable for imaging. [Background technology]

[0002] A zoom lens is used in which a lens group serving as a variator is driven by an actuator. Summary of the Invention [Problem to be solved by the invention]

[0003] In the zoom lens described above, in order to reduce the load on the actuator, it is necessary to reduce the size and weight of the lens group to be driven. [Means for solving the problem]

[0004] A zoom lens according to one aspect of the present invention has, arranged in order from the object side to the image side, a first lens group having negative refractive power, an intermediate group having overall positive refractive power, and a subsequent group having overall negative refractive power. The intermediate group has a first intermediate lens group having positive refractive power and a second intermediate lens group having positive refractive power adjacent to the first intermediate lens group on the image side. During zooming, the first lens group remains stationary, while the first intermediate lens group and the second intermediate lens group move, changing the spacing between adjacent lens groups. The first lens group includes two or more lenses. Let mp1 be the amount of movement of the first intermediate lens group when zooming from the wide-angle end to the telephoto end, mp2 be the amount of movement of the second intermediate lens group when zooming from the wide-angle end to the telephoto end, fp1 be the focal length of the first intermediate lens group, fp2 be the focal length of the second intermediate lens group, fw be the focal length of the zoom lens at the wide-angle end, ft be the focal length of the zoom lens at the telephoto end, and TTLw be the sum of the distance on the optical axis from the lens surface closest to the object to the lens surface closest to the image at the wide-angle end of the zoom lens and the air-equivalent distance on the optical axis from the lens surface closest to the image to the image plane, 0.10≦│mp2 / mp1│≦0.82 1.23≦fp2 / fp1≦10.00 1.50≦ft / fw≦6.00 0.10≦TTLw / fw≦10.00 The present invention is characterized in that the following conditions are satisfied:

[0005] A zoom lens according to another aspect of the present invention has, arranged in order from the object side to the image side, a first lens group with negative refractive power, an intermediate group with overall positive refractive power, and a subsequent group with overall negative refractive power. The intermediate group has a first intermediate lens group with positive refractive power and a second intermediate lens group with positive refractive power adjacent to the first intermediate lens group on the image side. During zooming, the first lens group remains stationary, while the first intermediate lens group and the second intermediate lens group move, changing the spacing between adjacent lens groups. The first lens group includes three or more lenses. Let fw be the focal length of the zoom lens at the wide-angle end and ft be the focal length of the zoom lens at the telephoto end. 1.50≦ft / fw≦6.00 The present invention is characterized in that the following conditions are satisfied:

[0006] Another aspect of the present invention is a zoom lens that includes, arranged in order from the object side to the image side, a first lens group with negative refractive power, an intermediate group with overall positive refractive power, and a subsequent group with overall negative refractive power. The intermediate group includes a first intermediate lens group with positive refractive power and a second intermediate lens group with positive refractive power that is adjacent to the first intermediate lens group on the image side. During zooming, the first lens group remains stationary, while the first intermediate lens group and the second intermediate lens group move, changing the spacing between adjacent lens groups. The first lens group includes two or more lens elements. Let mp1 be the amount of movement of the first intermediate lens group when zooming from the wide-angle end to the telephoto end, mp2 be the amount of movement of the second intermediate lens group when zooming from the wide-angle end to the telephoto end, fp1 be the focal length of the first intermediate lens group, fp2 be the focal length of the second intermediate lens group, fw be the focal length of the zoom lens at the wide-angle end, ft be the focal length of the zoom lens at the telephoto end, and TTLw be the sum of the distance on the optical axis from the lens surface closest to the object to the lens surface closest to the image at the wide-angle end of the zoom lens and the air-equivalent distance on the optical axis from the lens surface closest to the image to the image plane, 0.10≦│mp2 / mp1│≦0.82 1.23≦fp2 / fp1≦10.00 1.50≦ft / fw≦6.00 0.10≦TTLw / fw≦10.00 The present invention is characterized in that the following conditions are satisfied:

[0007] An imaging device for capturing an image of a subject through each of the zoom lenses constitutes another aspect of the present invention. [Brief explanation of the drawings]

[0008] [Figure 1] 1A to 1C are cross-sectional views of a zoom lens according to a first embodiment at a wide-angle end, a middle zoom position, and a telephoto end. [Figure 2] 5A to 5C are aberration diagrams of the zoom lens of Example 1 at the wide-angle end, at the intermediate zoom position, and at the telephoto end. [Figure 3] 10A to 10C are cross-sectional views of a zoom lens according to a second embodiment at a wide-angle end, a middle zoom position, and a telephoto end. [Figure 4] 10A to 10C are aberration diagrams of the zoom lens of Example 2 at the wide-angle end, at the intermediate zoom position, and at the telephoto end. [Figure 5] 10A to 10C are cross-sectional views of a zoom lens according to a third embodiment at a wide-angle end, a middle zoom position, and a telephoto end. [Figure 6] 10A to 10C are aberration diagrams of the zoom lens of Example 3 at the wide-angle end, at the intermediate zoom position, and at the telephoto end. [Figure 7] 10A to 10C are cross-sectional views of a zoom lens according to a fourth embodiment at a wide-angle end, a middle zoom position, and a telephoto end. [Figure 8] 10A to 10C are aberration diagrams of the zoom lens of Example 4 at the wide-angle end, at the intermediate zoom position, and at the telephoto end. [Figure 9] 10A to 10C are cross-sectional views of a zoom lens according to a fifth embodiment at a wide-angle end, a middle zoom position, and a telephoto end. [Figure 10] 10A to 10C are aberration diagrams of the zoom lens of Example 5 at the wide-angle end, at the intermediate zoom position, and at the telephoto end. [Figure 11] 13A to 13C are cross-sectional views of a zoom lens according to a sixth embodiment at a wide-angle end, a middle zoom position, and a telephoto end. [Figure 12] 13A to 13C are aberration diagrams of the zoom lens of Example 6 at the wide-angle end, at the intermediate zoom position, and at the telephoto end. [Figure 13] 13A to 13C are cross-sectional views of a zoom lens according to a seventh embodiment at a wide-angle end, a middle zoom position, and a telephoto end. [Figure 14] 13A to 13C are aberration diagrams of the zoom lens of Example 7 at the wide-angle end, at the intermediate zoom position, and at the telephoto end. [Figure 15] FIG. 1 is a schematic diagram of an imaging device. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0010] Before specifically describing the zoom lenses of Examples 1 to 7, we will explain matters common to all Examples. Figures 1, 3, 5, 7, 9, 11, and 13 show cross sections of the zoom lenses of Examples 1 to 7 at the wide-angle end, at the intermediate zoom position, and at the telephoto end, respectively. In each figure, the left side is the object side (front side), and the right side is the image side (rear side).

[0011] In a zoom lens, a lens group is a group of one or more lenses that may or may not move as a unit during zooming and focusing between the wide-angle end and the telephoto end. That is, the spacing between adjacent lens groups changes during zooming and focusing. The lens group may include an aperture stop. The wide-angle end and the telephoto end refer to the zoom states with the maximum and minimum angles of view (shortest focal lengths) when the lens group that moves during zooming is located at the ends of its mechanically or controllably movable range on the optical axis.

[0012] In a zoom lens, a lens element is a single lens component with refractive power, such as a single lens or a cemented lens. Therefore, a cemented lens formed by cementing two or more lenses together is counted as one lens element.

[0013] The zoom lens of each embodiment is used in various imaging devices such as digital video cameras, digital still cameras, broadcast cameras, silver halide film cameras, surveillance cameras, and vehicle-mounted cameras. The zoom lens of each embodiment can also be used as a projection lens in an image projection device (projector) that projects an image displayed on a display element onto a projection surface such as a screen. In this case, the left side of the figure is the projection surface side, and the right side is the display element side.

[0014] The zoom lens L0 of each embodiment includes, arranged in order from the object side to the image side, a first lens unit L1 having negative refractive power, an intermediate unit LM having positive refractive power as a whole, and a subsequent unit LR having negative refractive power as a whole.

[0015] The intermediate group LM includes a first intermediate lens group Lmp1 with positive refractive power and a second intermediate lens group Lmp2 with positive refractive power adjacent to the first intermediate lens group Lmp1 on the image side. The trailing group LR is adjacent to the second intermediate lens group Lmp2 on the image side. The zoom lens L0 of each embodiment is small overall, has a high zoom ratio, and high optical performance, and achieves small and lightweight lens groups that move during zooming and a reduced movement amount.

[0016] In each diagram, arrows below the lens groups that move during zooming indicate the path of movement during zooming from the wide-angle end to the telephoto end. Also, dotted arrows above the lens groups that move during focusing indicate the direction of movement during focusing from infinity to a close distance. Furthermore, an arrow above the vibration-reduction lens group that moves in a direction perpendicular to the optical axis for image shake correction (vibration reduction) indicates the direction of movement.

[0017] In each figure, SP is the aperture stop that determines the light flux at the maximum F-number (Fno), and IP is the image plane, where the imaging surface (light-receiving surface) of an imaging element such as a CCD sensor or CMOS sensor, or the film surface (photosensitive surface) of a silver halide film, is located.

[0018] The zoom lens L0 of each embodiment is designed to allow for distortion. This is because it is assumed that distortion of the optical image occurring on the image plane IP due to distortion will be corrected by image processing of image data obtained by an image sensor. For example, an imaging device that captures an image through the zoom lens L0 of each embodiment corrects the acquired image data by image processing using information indicating the amount of distortion of the zoom lens L0.

[0019] In the zoom lens L0 of each embodiment, the first lens unit L1 is stationary relative to the image plane IP during zooming. Because the lenses included in the first lens unit L1 have large outer diameters, the position of the first lens unit L is likely to be heavy. Therefore, by keeping the first lens unit L1 stationary during zooming, fast and quiet zooming can be achieved. Furthermore, by keeping the first lens unit L1 stationary during zooming, tilt of the first lens unit L1 that occurs during zooming can be suppressed, improving optical performance.

[0020] In the zoom lens L0 of each embodiment, the first intermediate lens group Lmp1 and the second intermediate lens group Lmp2 move toward the object during zooming from the wide-angle end to the telephoto end. Zooming is performed by moving the first intermediate lens group Lmp1, which has positive refractive power, and the second intermediate lens group Lmp2, which has positive refractive power, closer to the first lens group L1, which has negative refractive power. Furthermore, during zooming from the wide-angle end to the telephoto end, the second intermediate lens group Lmp2 moves toward the object while increasing its distance from the first intermediate lens group Lmp1. This reduces the amount of movement of the second intermediate lens group Lmp2 and makes it possible to reduce the size of the second intermediate lens group Lmp2 while correcting field curvature. As a result, the load on the actuator that electrically drives the second intermediate lens group Lmp2 can be reduced, enabling fast and quiet zooming.

[0021] In the zoom lens L0 of each embodiment, the second intermediate lens unit Lmp2 may be a vibration-reduction lens unit. By reducing the size and weight of the second intermediate lens unit Lmp2 as a vibration-reduction lens unit, it is possible to effectively correct image blur while reducing the drive load during zooming.

[0022] In the zoom lens L0 of each embodiment, the first lens unit L1 is provided with two or more lenses, including at least one negative lens and at least one positive lens, to achieve excellent aberration correction. By effectively correcting off-axial aberrations, such as chromatic aberration and field curvature, that occur in the first lens unit L1, which remains stationary during zooming, it is possible to reduce the number of lenses required for aberration correction in the intermediate unit LM and the subsequent unit LR, which move during zooming. As a result, the lens units that move during zooming are made smaller and lighter. From the perspective of chromatic aberration correction, it is preferable that one positive lens be positioned closest to the image in the first lens unit L1.

[0023] Next, conditions that the zoom lens L0 of each embodiment should preferably satisfy will be described. The zoom lens L0 of each embodiment should preferably satisfy at least one of the conditions in the following expressions (1) to (4).

[0024] 0.10≦│mp2 / mp1│≦0.82 (1) 1.23≦fp2 / fp1≦10.00 (2) 1.50≦ft / fw≦6.00 (3) 0.10≦TTLw / fw≦10.00 (4) In the above equations (1) to (4), the movement amount of the first intermediate lens group Lmp1 during zooming from the wide-angle end to the telephoto end is denoted as mp1, and the movement amount of the second intermediate lens group Lmp2 during zooming from the wide-angle end to the telephoto end is denoted as mp2. The movement amount of a lens group is the difference between the position of that lens group at the wide-angle end and the position of that lens group at the telephoto end, and does not include the amount of reciprocating movement, and is considered positive when the lens group is located closer to the image at the telephoto end than at the wide-angle end. The focal length of the first intermediate lens group Lmp1 is denoted as fp1, the focal length of the second intermediate lens group Lmp2 is denoted as fp2, the focal length of the entire zoom lens system L0 at the wide-angle end is denoted as fw, and the focal length of the entire zoom lens system L0 at the telephoto end is denoted as ft. TTLw is the sum of the distance on the optical axis from the lens surface of the zoom lens L0 closest to the object to the lens surface of the zoom lens L0 closest to the image at the wide-angle end and the air-equivalent distance on the optical axis from the lens surface of the zoom lens L0 closest to the image to the image plane.

[0025] The condition of formula (1) indicates an appropriate relationship between the movement amounts of the first intermediate lens group Lmp1 and the second intermediate lens group Lmp2 during zooming from the wide-angle end to the telephoto end. If |mp2 / mp1| exceeds the upper limit of formula (1), the movement amount of the second intermediate lens group Lmp2 becomes too large and suppression of fluctuations in aberrations such as field curvature becomes insufficient, which is undesirable. If |mp2 / mp1| falls below the lower limit of formula (1), the movement amount of the second intermediate lens group Lmp2 required to achieve high zoom ratios cannot be ensured sufficiently, or the movement amount of the first intermediate lens group Lmp1 becomes too large, which is also undesirable.

[0026] It is more preferable that the lower limit of the formula (1) is 0.30, 0.50, or 0.60, and it is more preferable that the upper limit of the formula (1) is 0.81, 0.80, or 0.795.

[0027] The condition of formula (2) indicates an appropriate relationship between the focal lengths of the first intermediate lens group Lmp1 and the second intermediate lens group Lmp2. If fp2 / fp1 exceeds the upper limit of formula (2), the refractive power of the first intermediate lens group Lmp1 becomes too strong, making it difficult to correct aberrations properly, or the refractive power of the second intermediate lens group Lmp2 becomes too weak, increasing the amount of movement required during zooming, which is undesirable. If fp2 / fp1 falls below the lower limit of formula (2), the refractive power of the first intermediate lens group Lmp1 becomes too weak, making it difficult to correct aberrations properly, and is undesirable.

[0028] It is more preferable that the lower limit of the formula (2) is 1.40, 1.60, 1.80 or 2.00, and it is more preferable that the upper limit of the formula (2) is 8.00, 6.00, 4.00 or 3.00.

[0029] The condition of formula (3) indicates an appropriate zoom ratio for the zoom lens L0. If ft / fw exceeds the upper limit of formula (3), the zoom ratio becomes too large, making it difficult to suppress aberration fluctuations due to zooming across the entire zoom range, which is undesirable. If ft / fw falls below the lower limit of formula (3), it becomes impossible to achieve the necessary high zoom ratio, which is also undesirable.

[0030] It is more preferable that the lower limit of the formula (3) is 1.75, 1.85, 1.95 or 2.00, and it is more preferable that the upper limit of the formula (3) is 4.50, 4.00, 3.50 or 3.00.

[0031] The condition of formula (4) indicates the appropriate relationship between the overall optical length of the zoom lens L0 at the wide-angle end and the focal length of the entire system. If TTLw / fw exceeds the upper limit of formula (4), the zoom lens L0 will become large, which is undesirable. If TTLw / fw falls below the lower limit of formula (4), there will not be enough space to place the lenses necessary to achieve sufficient aberration correction, which is also undesirable.

[0032] It is more preferable that the lower limit of the formula (4) is 1.00, 1.50, 2.50, 3.50, or 4.50, and it is more preferable that the upper limit of the formula (4) is 9.00, 8.50, 8.00, or 7.50.

[0033] It is also preferable that the zoom lens L0 of each embodiment satisfies at least one of the following configurations.

[0034] The first lens group L1 of the zoom lens L0 in each embodiment preferably includes two meniscus lenses having negative refractive power and convex toward the object side, arranged in order from the object side to the image side. Furthermore, these two meniscus lenses are preferably configured as two lens elements. This allows the zoom lens L0 to achieve a higher magnification ratio toward the wide-angle side while effectively correcting off-axis aberrations such as field curvature.

[0035] It is preferable that the first intermediate lens group Lmp1 includes an aperture stop SP. This allows the size and weight of movable lens groups such as the first intermediate lens group Lmp1 and the second intermediate lens group Lmp2, which are arranged near the aperture stop SP. This reduces the load on the actuator used to electrically drive the lens groups during zooming, while allowing the multiple lenses necessary for aberration correction to be provided, thereby achieving good aberration performance across the entire zoom range with a high zoom ratio.

[0036] The first intermediate lens group Lmp1 includes an aspherical lens having a positive refractive power and an aspherical lens surface whose refractive power weakens from the vicinity of the optical axis toward the periphery, thereby enabling the overall length of the zoom lens L0 to be reduced while effectively correcting spherical aberration, coma, and other aberrations that occur particularly at the telephoto end.

[0037] It is also preferable that the first intermediate lens unit Lmp1, the second intermediate lens unit Lmp2, and the rear lens unit LR all move toward the object side during zooming from the wide-angle end to the telephoto end, thereby achieving a high zoom ratio while effectively suppressing aberration fluctuations due to zooming.

[0038] It is also preferable that the second intermediate lens group Lmp2 includes a cemented lens formed by cementing one positive lens and one negative lens together, thereby suppressing chromatic aberration occurring in the second intermediate lens group Lmp2 and, as a result, suppressing fluctuations in chromatic aberration due to zooming.

[0039] Furthermore, it is preferable that the trailing lens unit LR, which has a negative refractive power overall, be positioned adjacent to the intermediate lens unit LM, which has a positive refractive power overall, on the image side. It is also preferable that all lens units included in the trailing lens unit LR have negative refractive power (i.e., the trailing lens unit LR is composed only of lens units with negative refractive power). Providing a telephoto-type power arrangement like this shortens the overall length of the zoom lens, making it possible to make the entire system more compact.

[0040] It is also preferable that the rear group LR be composed of two or more lenses. In this case, a cemented lens formed by cementing two lenses is counted as two lenses. It is also preferable that the rear group LR be composed of two or more lens elements. It is also preferable that a biconvex air lens be formed between two adjacent lenses or two lens elements. This configuration can suppress fluctuations in various aberrations, such as spherical aberration and field curvature, that occur in the rear group LR during zooming. It is also preferable that the object-side lens surface of the lens located closest to the object in the rear group LR has a convex shape toward the object. This can suppress fluctuations in spherical aberration that occur during zooming. It is also more preferable that the lens element closest to the object in the rear group LR has negative refractive power and a meniscus shape that is convex toward the object.

[0041] It is also preferable to move all of the lenses in the rear lens unit LR toward the image side during focusing from infinity to close range (i.e., use the rear lens unit LR as the focusing unit), which allows focusing to be performed while suppressing fluctuations in various aberrations such as spherical aberration and curvature of field.

[0042] Furthermore, a final lens group Lk with positive refractive power that does not move (is fixed) during zooming may be located closest to the image side of the zoom lens L0. For example, when the zoom lens L0 is used as an electric zoom lens for an interchangeable lens camera, the robustness of the zoom lens L0 can be improved by locating the fixed final lens group Lk closest to the image side to prevent direct access to the movable lens groups from the outside. Furthermore, by locating the final lens group Lk with positive refractive power closest to the image side, the angle of incidence of off-axial light rays with respect to the imaging surface of the image sensor can be reduced, thereby suppressing shading that occurs in the peripheral areas of the image.

[0043] It is also preferable that the zoom lens L0 of each embodiment satisfies at least one of the conditions of the following expressions (5) to (10).

[0044] 0.73≦(-frw) / fp1≦2.04 (5) 0.71≦fat / ft≦1.52 (6) 0.46≦BFw / fw≦1.44 (7) 0.54≦(-f1) / fp1≦2.29 (8) 0.32≦│mn1 / mp1│≦0.77 (9) 1.45≦Nave≦1.80 (10) In equations (5) to (10), the composite focal length of the rear lens unit LR at the wide-angle end is denoted by frw, and the composite focal length from the first lens unit L1 to the first intermediate lens unit Lmp1 at the telephoto end is denoted by fat. Also, the air-equivalent distance (back focus) on the optical axis from the lens surface closest to the image side of the zoom lens L0 at the wide-angle end to the image plane is denoted by BFw, and the focal length of the first lens unit L1 is denoted by f1. Furthermore, the amount of movement of the first rear lens unit Lrn1 during zooming from the wide-angle end to the telephoto end is denoted by mn1, and the average value of the refractive index at the d-line of the glass materials used in all lenses included in all movable lens units that move during zooming is denoted by Nave.

[0045] The condition of equation (5) indicates the appropriate relationship between the combined focal length of the rear unit LR at the wide-angle end and the focal length of the first intermediate lens unit Lmp1. If (-frw) / fp1 exceeds the upper limit of equation (5), the power of the first intermediate lens unit Lmp1 becomes too strong, making it difficult to correct on-axial aberrations such as spherical aberration, which is undesirable. If (-frw) / fp1 falls below the lower limit of equation (5), the power of the rear unit LR becomes too strong, making it difficult to correct off-axial aberrations such as field curvature, which is undesirable.

[0046] It is more preferable that the lower limit of the formula (5) is 0.78, 0.83, 0.87, or 0.90, and it is more preferable that the upper limit of the formula (5) is 9.00, 8.50, 8.00, or 7.50.

[0047] The condition of formula (6) indicates the appropriate relationship between the composite focal length from the first lens unit L1 to the first intermediate lens unit Lmp1 at the telephoto end and the focal length of the entire zoom lens L0. If fat / ft exceeds the upper limit of formula (6), the composite power from the first lens unit L1 to the first intermediate lens unit Lmp1 becomes too weak, which undesirably increases the size of the zoom lens L0. If fat / ft falls below the lower limit of formula (6), the composite power becomes too strong, which undesirably makes it difficult to effectively correct various aberrations such as spherical aberration.

[0048] It is more preferable that the lower limit of the formula (6) is 0.75, 0.79, or 0.82, and it is more preferable that the upper limit of the formula (6) is 1.40, 1.28, or 1.23.

[0049] The condition of formula (7) shows the appropriate relationship between the back focal length of the zoom lens L0 at the wide-angle end and the focal length of the entire system. If BFw / fw exceeds the upper limit of formula (7), the total optical length of the zoom lens L0 becomes too long, which is undesirable. If BFw / fw falls below the lower limit of formula (7), the flange back (the distance from the lens mount surface to the image plane in the imaging device) cannot be sufficiently secured, which makes it difficult to arrange shutter components and the like in the imaging device, which is undesirable.

[0050] It is more preferable that the lower limit of the formula (7) is 0.52, 0.59, or 0.64, and it is more preferable that the upper limit of the formula (7) is 1.33, 1.22, or 1.12.

[0051] The condition of formula (8) indicates the appropriate relationship between the focal length of the first lens unit L1 and the focal length of the first intermediate lens unit Lmp1. If (-f1) / fp1 exceeds the upper limit of formula (8), the power of the first lens unit L1 becomes too weak, which results in an increase in the outer diameter of the first lens unit Lmp1 as the angle of view increases, which is undesirable. Alternatively, the power of the first intermediate lens unit Lmp1 becomes too strong, which makes it difficult to correct on-axial aberrations such as spherical aberration, which is undesirable. If (-f1) / fp1 falls below the lower limit of formula (8), the power of the first lens unit L1 becomes too strong, which results in an increase in the angle of view, which makes it difficult to correct off-axial aberrations such as field curvature that occur in the first lens unit Lmp1, which is undesirable. Alternatively, the power of the first intermediate lens unit Lmp1 becomes too weak, which makes it difficult to obtain the required zoom ratio, which is undesirable.

[0052] It is more preferable that the lower limit of the formula (8) is 0.61, 0.64, or 0.66, and it is more preferable that the upper limit of the formula (8) is 2.10, 2.00, 1.34, or 1.00.

[0053] The condition of equation (9) indicates an appropriate relationship between the movement amounts of the first intermediate lens unit Lmp1 and the first subsequent lens unit Lrn1 during zooming from the wide-angle end to the telephoto end. If |mn1 / mp1| exceeds the upper limit of equation (9), the movement amount of the first subsequent lens unit Lrn1 becomes too large, and suppression of fluctuations in aberrations such as field curvature becomes insufficient, which is undesirable. If |mn1 / mp1| falls below the lower limit of equation (9), the movement amount of the first intermediate lens unit Lmp1 becomes too large, and suppression of fluctuations in aberrations such as spherical aberration becomes insufficient, which is undesirable.

[0054] It is more preferable that the lower limit of the formula (9) is set to 0.34, 0.36, or 0.38, and it is more preferable that the upper limit of the formula (9) is set to 0.71, 0.67, or 0.65.

[0055] The condition of formula (10) indicates the appropriate average value of the refractive index of the glass material used in the movable lens group that moves during zooming. If Nave exceeds the upper limit of formula (10), the sensitivity to manufacturing errors in the lenses that make up the movable lens group becomes too high, making it difficult to suppress degradation of optical performance due to manufacturing errors, which is undesirable. If Nave falls below the lower limit of formula (10), sufficient aberration correction cannot be performed to achieve high optical performance, which is also undesirable.

[0056] It is more preferable that the lower limit of the formula (10) is 1.50, 1.52, 1.54, or 1.56, and it is more preferable that the upper limit of the formula (9) is 1.77, 1.75, or 1.74.

[0057] Next, the specific configuration of the zoom lens L0 of each embodiment will be described. [Example]

[0058] 1 is composed of, arranged in order from the object side to the image side, a first lens unit L1 having negative refractive power, a first intermediate lens unit Lmp1 having positive refractive power, a second intermediate lens unit Lmp2 having positive refractive power, a first subsequent lens unit Lrn1 having negative refractive power, and a final lens unit Lk having positive refractive power. The intermediate lens unit LM is composed of the first intermediate lens unit Lmp1 and the second intermediate lens unit Lmp2, and the subsequent lens unit LR is composed of the first subsequent lens unit Lrn1.

[0059] During zooming, the first lens unit L1 and the final lens unit Lk remain stationary relative to the image plane IP. During zooming from the wide-angle end to the telephoto end, the first intermediate lens unit Lmp1, the second intermediate lens unit Lmp2, and the first subsequent lens unit Lrn1 move monotonically toward the object side. During focusing from infinity to a close distance, the first subsequent lens unit Lrn1 moves toward the image side. To reduce (correct) image blur caused by camera shake such as hand shake, the second intermediate lens unit Lmp2 moves in a direction perpendicular to the optical axis (shown by the dashed line in the figure).

[0060] The first lens group L1 is composed of four lenses arranged in order from the object side to the image side: a first negative meniscus lens convex toward the object side, a second negative meniscus lens convex toward the object side, a biconcave negative lens, and a positive meniscus lens convex toward the object side.

[0061] The first intermediate lens group Lmp1 is composed of three lenses arranged in order from the object side to the image side: a positive biconvex lens with aspherical surfaces on both sides, a negative biconcave lens arranged on the image side of the aperture stop SP, and a positive biconvex lens.

[0062] The second intermediate lens group Lmp2 is composed of a positive cemented lens (two lenses in total) consisting of a negative meniscus lens convex toward the object side and a positive meniscus lens convex toward the object side, arranged in order from the object side to the image side.

[0063] The first subsequent lens group Lrn1 is composed of two lenses arranged in order from the object side to the image side: a negative meniscus lens convex toward the object side, and a negative meniscus lens with aspherical surfaces on both sides and convex toward the image side. The final lens group Lk is composed of one lens, a positive meniscus lens convex toward the image side. [Example]

[0064] 3 is composed of, arranged in order from the object side to the image side, a first lens unit L1 having negative refractive power, a first intermediate lens unit Lmp1 having positive refractive power, a second intermediate lens unit Lmp2 having positive refractive power, a first subsequent lens unit Lrn1 having negative refractive power, a second subsequent lens unit Lrn2 having negative refractive power, and a final lens unit Lk having positive refractive power. The intermediate lens unit LM is composed of the first intermediate lens unit Lmp1 and the second intermediate lens unit Lmp2, and the subsequent lens unit LR is composed of the first subsequent lens unit Lrn1 and the second subsequent lens unit Lrn2.

[0065] During zooming, the first lens unit L1 and the final lens unit Lk remain stationary relative to the image plane IP. During zooming from the wide-angle end to the telephoto end, the first intermediate lens unit Lmp1, the second intermediate lens unit Lmp2, the first subsequent lens unit Lrn1, and the second subsequent lens unit Lrn2 move monotonically toward the object side. During focusing from infinity to a close distance, the first subsequent lens unit Lrn1 and the second subsequent lens unit Lrn2 move toward the image side along mutually different trajectories. To correct image blur, the second intermediate lens unit Lmp2 moves in a direction perpendicular to the optical axis.

[0066] The first lens group L1 is composed of four lenses, arranged in order from the object side to the image side: a first negative meniscus lens whose image-side lens surface is aspherical and convex toward the object side; a second negative meniscus lens whose image-side lens surface is convex toward the object side; a biconcave negative lens; and a positive meniscus lens whose image-side lens surface is aspherical and convex toward the object side.

[0067] The first intermediate lens group Lmp1 is composed of a total of four lenses, arranged in order from the object side to the image side: a positive lens with aspherical surfaces on both sides and a biconvex shape, a positive lens with a biconvex shape, a negative lens with a biconcave shape, and a positive plano-convex lens arranged on the image side of the aperture stop SP, whose lens surface on the image side is aspherical and has a convex shape toward the image side.

[0068] The second intermediate lens group Lmp2 is composed of a positive cemented lens (two lenses) in which a negative meniscus lens having a convex shape facing the object side and a positive meniscus lens having a convex shape facing the object side are cemented together.

[0069] The first subsequent lens group Lrn1 is composed of a negative cemented lens (two lenses) in which a biconvex positive lens and a biconcave negative lens are cemented together, arranged in order from the object side to the image side.

[0070] The second subsequent lens group Lrn2 is composed of one lens that is a negative meniscus lens that is convex toward the image side.

[0071] The final lens unit Lk is composed of one lens as a positive meniscus lens having a convex shape facing the image side. [Example]

[0072] 5 is composed of, arranged in order from the object side to the image side, a first lens unit L1 having negative refractive power, a middle lens unit Lmn having negative refractive power, a first intermediate lens unit Lmp1 having positive refractive power, a second intermediate lens unit Lmp2 having positive refractive power, a first subsequent lens unit Lrn1 having negative refractive power, and a final lens unit Lk having positive refractive power. The middle lens unit LM is composed of the middle lens unit Lmn, the first intermediate lens unit Lmp1, and the second intermediate lens unit Lmp2, and the subsequent lens unit LR is composed of the first subsequent lens unit Lrn1.

[0073] During zooming, the first lens unit L1 and the final lens unit Lk remain stationary relative to the image plane IP. When zooming from the wide-angle end to the intermediate zoom position, the intermediate lens unit Lmn moves monotonically toward the image side, and when zooming from the intermediate zoom position to the telephoto end, the intermediate lens unit Lmn moves monotonically toward the object side. Furthermore, when zooming from the wide-angle end to the telephoto end, the first intermediate lens unit Lmp1, the second intermediate lens unit Lmp2, and the first subsequent lens unit Lrn1 move monotonically toward the object side. When focusing from infinity to a close distance, the intermediate lens unit Lmn moves toward the object side. To correct image blur, the second intermediate lens unit Lmp2 moves in a direction perpendicular to the optical axis.

[0074] The first lens group L1 is composed of four lenses arranged in order from the object side to the image side: a first negative meniscus lens that is convex toward the object side; a second negative meniscus lens that has aspherical surfaces on both sides and is convex toward the object side; a biconcave negative lens; and a biconvex positive lens.

[0075] The intermediate lens group Lmn is composed of one lens that is a negative biconcave lens.

[0076] The first intermediate lens group Lmp1 is composed of three lenses in total, arranged in order from the object side to the image side: a positive lens with aspherical surfaces on both sides and a biconvex shape; and a positive cemented lens (two lenses) arranged on the image side of the aperture stop SP and consisting of a negative meniscus lens with a convex shape facing the object side and a biconvex positive lens cemented together.

[0077] The second intermediate lens group Lmp2 is composed of a positive cemented lens (two lenses) consisting of a negative meniscus lens convex toward the object side and a positive meniscus lens convex toward the object side, arranged in order from the object side to the image side.

[0078] The first subsequent lens group Lrn1 is composed of two lenses arranged in order from the object side to the image side: a negative meniscus lens convex toward the object side, and a negative meniscus lens with double aspherical surfaces convex toward the image side.

[0079] The final lens unit Lk is composed of one lens as a positive meniscus lens having a convex shape facing the image side. [Example]

[0080] 7 is composed of, arranged in order from the object side to the image side, a first lens unit L1 having negative refractive power, a first intermediate lens unit Lmp1 having positive refractive power, a second intermediate lens unit Lmp2 having positive refractive power, a first subsequent lens unit Lrn1 having negative refractive power, and a final lens unit Lk having positive refractive power. The intermediate lens unit LM is composed of the first intermediate lens unit Lmp1 and the second intermediate lens unit Lmp2, and the subsequent lens unit LR is composed of the first subsequent lens unit Lrn1.

[0081] During zooming, the first lens unit L1 and the final lens unit Lk remain stationary relative to the image plane IP. During zooming from the wide-angle end to the telephoto end, the first intermediate lens unit Lmp1, the second intermediate lens unit Lmp2, and the first subsequent lens unit Lrn1 move monotonically toward the object side. During focusing from infinity to a close distance, the first subsequent lens unit Lrn1 moves toward the image side. To correct image blur, the second intermediate lens unit Lmp2 moves in a direction perpendicular to the optical axis.

[0082] The first lens group L1 is composed of four lenses arranged in order from the object side to the image side: a first negative meniscus lens convex toward the object side, a second negative meniscus lens convex toward the object side, a biconcave negative lens, and a positive meniscus lens convex toward the object side.

[0083] The first intermediate lens group Lmp1 is composed of four lenses arranged in order from the object side to the image side: a biconvex positive lens with aspherical surfaces on both sides, a biconcave negative lens, a biconcave negative lens on the image side of the aperture stop SP, and a biconvex positive lens.

[0084] The second intermediate lens group Lmp2 is composed of a positive cemented lens (two lenses) in which a biconvex positive lens and a biconcave negative lens are cemented together, arranged in order from the object side to the image side.

[0085] The first subsequent lens group Lrn1 is composed of two lenses arranged in order from the object side to the image side: a negative meniscus lens that is convex toward the object side, and a negative meniscus lens that has aspherical surfaces on both sides and is convex toward the image side.

[0086] The final lens unit Lk is composed of one lens as a positive meniscus lens having a convex shape facing the image side. [Example]

[0087] 9 is composed of, arranged in order from the object side to the image side, a first lens unit L1 having negative refractive power, a first intermediate lens unit Lmp1 having positive refractive power, a second intermediate lens unit Lmp2 having positive refractive power, a first subsequent lens unit Lrn1 having negative refractive power, and a final lens unit Lk having positive refractive power. The intermediate lens unit LM is composed of the first intermediate lens unit Lmp1 and the second intermediate lens unit Lmp2, and the subsequent lens unit LR is composed of the first subsequent lens unit Lrn1.

[0088] During zooming, the first lens unit L1 and the final lens unit Lk remain stationary relative to the image plane IP. During zooming from the wide-angle end to the telephoto end, the first intermediate lens unit Lmp1, the second intermediate lens unit Lmp2, and the first subsequent lens unit Lrn1 move monotonically toward the object side. During focusing from infinity to a close distance, the first subsequent lens unit Lrn1 moves toward the image side. To correct image blur, the second intermediate lens unit Lmp2 moves in a direction perpendicular to the optical axis.

[0089] The first lens group L1 is composed of four lenses arranged in order from the object side to the image side: a first negative meniscus lens that is convex toward the object side; a second negative meniscus lens that has an aspherical lens surface toward the image side and is convex toward the object side; a biconcave negative lens; and a biconvex positive lens.

[0090] The first intermediate lens group Lmp1 is composed of a total of four lenses, arranged in order from the object side to the image side: a positive lens with aspherical surfaces on both sides and a biconvex shape, a negative meniscus lens with a convex shape facing the object side, and a positive cemented lens (two lenses) arranged on the image side of the aperture stop SP and consisting of a biconcave negative lens and a biconvex positive lens cemented together.

[0091] The second intermediate lens group Lmp2 is composed of a positive cemented lens (two lenses) in which a biconvex positive lens and a negative meniscus lens convex toward the image side are cemented together, arranged in order from the object side to the image side.

[0092] The first subsequent lens group Lrn1 is composed of two lenses arranged in order from the object side to the image side: a negative meniscus lens that is convex toward the object side, and a negative meniscus lens that has aspherical surfaces on both sides and is convex toward the image side.

[0093] The final lens unit Lk is composed of one lens that is a biconvex positive lens. [Example]

[0094] 11 is composed of, arranged in order from the object side to the image side, a first lens unit L1 having negative refractive power, a first intermediate lens unit Lmp1 having positive refractive power, a second intermediate lens unit Lmp2 having positive refractive power, a first subsequent lens unit Lrn1 having negative refractive power, and a final lens unit Lk having positive refractive power. The intermediate lens unit LM is composed of the first intermediate lens unit Lmp1 and the second intermediate lens unit Lmp2, and the subsequent lens unit LR is composed of the first subsequent lens unit Lrn1.

[0095] During zooming, the first lens unit L1 and the final lens unit Lk remain stationary relative to the image plane IP. During zooming from the wide-angle end to the telephoto end, the first intermediate lens unit Lmp1, the second intermediate lens unit Lmp2, and the first subsequent lens unit Lrn1 move monotonically toward the object side. During focusing from infinity to a close distance, the first subsequent lens unit Lrn1 moves toward the image side. To correct image blur, the second intermediate lens unit Lmp2 moves in a direction perpendicular to the optical axis.

[0096] The first lens group L1 is composed of four lenses arranged in order from the object side to the image side: a first negative meniscus lens convex toward the object side, a second negative meniscus lens convex toward the object side, a biconcave negative lens, and a positive meniscus lens convex toward the object side.

[0097] The first intermediate lens group Lmp1 is composed of a total of four lenses, arranged in order from the object side to the image side: a positive lens with aspherical surfaces on both sides and a biconvex shape, a negative meniscus lens with a convex shape toward the object side, and a positive cemented lens (two lenses) arranged on the image side of the aperture stop SP and cemented together a negative meniscus lens with a convex shape toward the object side and a biconvex positive lens.

[0098] The second intermediate lens group Lmp2 is composed of a positive cemented lens (two lenses) in which a biconvex positive lens and a biconcave negative lens are cemented together, arranged in order from the object side to the image side.

[0099] The first subsequent lens group Lrn1 is composed of two lenses arranged in order from the object side to the image side: a negative meniscus lens that is convex toward the object side, and a negative meniscus lens that has aspherical surfaces on both sides and is convex toward the image side.

[0100] The final lens unit Lk is composed of one lens as a positive meniscus lens having a convex shape facing the image side. [Example]

[0101] 13 is composed of, arranged in order from the object side to the image side, a first lens unit L1 having negative refractive power, a first intermediate lens unit Lmp1 having positive refractive power, a second intermediate lens unit Lmp2 having positive refractive power, and a first subsequent lens unit Lrn1 having negative refractive power. The intermediate lens unit LM is composed of the first intermediate lens unit Lmp1 and the second intermediate lens unit Lmp2, and the subsequent lens unit LR is composed of the first subsequent lens unit Lrn1.

[0102] During zooming, the first lens unit L1 remains stationary relative to the image plane IP. During zooming from the wide-angle end to the telephoto end, the first intermediate lens unit Lmp1, the second intermediate lens unit Lmp2, and the first subsequent lens unit Lrn1 move monotonically toward the object side. During focusing from infinity to a close distance, the first subsequent lens unit Lrn1 moves toward the image side. To correct image blur, the second intermediate lens unit Lmp2 moves in a direction perpendicular to the optical axis.

[0103] The first lens group L1 is composed of four lenses arranged in order from the object side to the image side: a first negative meniscus lens convex toward the object side, a second negative meniscus lens convex toward the object side, a biconcave negative lens, and a positive meniscus lens convex toward the object side.

[0104] The first intermediate lens group Lmp1 is composed of three lenses arranged in order from the object side to the image side: a positive lens with double aspherical surfaces and a biconvex shape, a negative meniscus lens with a convex shape toward the object side arranged on the image side of the aperture stop SP, and a positive meniscus lens with a convex shape toward the image side.

[0105] The second intermediate lens group Lmp2 is composed of a positive cemented lens (two lenses) consisting of a negative meniscus lens convex toward the object side and a positive meniscus lens convex toward the object side, arranged in order from the object side to the image side.

[0106] The first subsequent lens group Lrn1 is composed of three lenses arranged in order from the object side to the image side: a negative cemented meniscus lens (two lenses) consisting of a biconvex positive lens cemented with a biconcave negative lens, and a negative meniscus lens that is a plastic lens with aspherical surfaces on both sides and is convex toward the image side.

[0107] Numerical Examples 1 to 7 are shown below. In the surface data of each numerical example, surface number m indicates the order of the surface when counted from the object side. r is the radius of curvature of the mth surface, d (mm) is the lens thickness or air gap (mm) on the optical axis between the mth surface and the (m+1)th surface, and nd is the refractive index at the d-line of the optical material between the mth surface and the (m+1)th surface. νd is the Abbe number based on the d-line of the optical material between the mth surface and the (m+1)th surface. The Abbe number based on the d-line, νd, is expressed as νd = (Nd-1) / (NF-NC), where Nd, NF, and NC are the refractive indices at the Fraunhofer d-line (587.6 nm), F-line (486.1 nm), and C-line (656.3 nm).

[0108] The focal length (mm), F-number, and half angle of view (°) are values ​​when the zoom lens is focused on an object at infinity. BF represents back focus (mm). Back focus is the distance on the optical axis from the lens surface closest to the image (the final surface) of the zoom lens to the paraxial image plane, expressed as the air-equivalent length. The total lens length is the distance on the optical axis from the lens surface closest to the object (the front surface) of the zoom lens to the final surface plus the back focus, and is equivalent to the total optical length.

[0109] An "*" next to a surface number indicates that the surface has an aspherical shape. The aspherical shape is expressed by the following formula, 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, the direction of light travel is positive, R is the paraxial radius of curvature, K is the conic constant, and A4, A6, A8, A10, and A12 are aspherical coefficients. The conic constant and the aspherical coefficient "e±Z" are expressed as x10 ±Z means.

[0110] 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 2, 4, 6, 8, 10, 12, and 14(A), (B), and (C) respectively show the longitudinal aberrations (spherical aberration, astigmatism, distortion, and chromatic aberration) of the zoom lens L0 of Numerical Examples 1 to 7 at the wide-angle end, the intermediate zoom position, and the telephoto end when focused on an object at infinity.

[0111] In the spherical aberration diagram, Fno indicates the F-number, the solid line indicates spherical aberration at the d-line (wavelength 587.6 nm), and the two-dot chain line indicates spherical aberration at the g-line (wavelength 435.8 nm). In the astigmatism diagram, the solid line S indicates astigmatism at the sagittal image plane, and the dashed line M indicates astigmatism at the meridional image plane. The distortion diagram shows distortion at the d-line. The chromatic aberration diagram shows lateral chromatic aberration at the g-line. ω is the half angle of view (°). [Numerical Example 1] Unit: mm Surface Data Surface number rd nd νd 1 48.788 2.00 1.80400 46.5 2 21.860 5.64 3 57.046 1.74 1.72916 54.7 4 23.770 7.35 5 -54.146 1.36 1.49700 81.7 6 170.908 0.61 7 44.960 3.16 1.90110 27.1 8 171.520 (variable) 9* 23.768 6.51 1.58313 59.4 10* -38.363 4.07 11 (Aperture) ∞ 2.16 12 -64.016 0.90 1.73800 32.3 13 30.388 2.63 14 108.662 4.69 1.49700 81.7 15 -20.020 (variable) 16 26.181 1.05 1.72047 34.7 17 18.469 3.58 1.49700 81.7 18 118.593 (variable) 19 24.431 1.20 1.80400 46.5 20 16.770 7.15 21* -34.605 1.70 1.58313 59.4 22* -990.655 (variable) 23 -168.002 7.73 1.67300 38.1 24 -33.001 13.50 Image plane ∞ Aspheric data 9th page K = 0.00000e+00 A 4=-1.65323e-05 A 6=-3.34095e-08 A 8= 1.98795e-10 A10=-3.25473e-12 Side 10 K = 0.00000e+00 A 4= 1.36050e-05 A 6=-3.75284e-08 A 8= 2.12565e-10 A10=-3.23024e-12 Page 21 K = 0.00000e+00 A 4=-1.18164e-04 A 6= 2.73264e-07 A 8=-2.67312e-09 A10= 8.38987e-12 Page 22 K = 0.00000e+00 A 4=-9.89605e-05 A 6= 3.76549e-07 A 8=-1.73256e-09 A10= 4.12838e-12 Various data Zoom ratio 2.35 Wide-angle Mid-range Telephoto Focal length 20.60 31.67 48.50 F-number 4.08 4.08 4.12 Half angle of view (°) 41.81 32.43 23.57 Image height 18.43 20.12 21.16 Lens length 114.20 114.20 114.20 BF 13.50 13.50 13.50 d 8 27.74 14.95 2.17 d15 1.55 5.01 9.40 d18 2.45 2.55 7.77 d22 3.74 12.97 16.15 Lens group data Group starting plane focal length 1 1 -28.76 2 9 31.90 3 16 85.78 4 19 -31.75 5 23 59.65 [Numerical Example 2] Unit: mm Surface Data Surface number rd nd νd 1 51.999 1.50 1.76450 49.1 2* 21.707 7.13 3 89.782 1.50 1.72916 54.7 4 33.747 6.96 5 -46.940 1.00 1.43875 94.7 6 481.579 0.15 7 48.882 3.08 1.90110 27.1 8 172.633 (variable) 9* 25.608 6.60 1.58313 59.4 10* -45.641 1.90 11 743.905 3.43 1.59282 68.6 12 -32.695 0.78 13 -33.591 0.90 1.67300 38.3 14 27.082 3.62 15 (Aperture) ∞ 1.50 16 ∞ 4.76 1.49700 81.7 17* -22.237 (variable) 18 39.639 0.90 1.85478 24.8 19 23.350 2.82 1.72916 54.7 20 153.745 (variable) 21 38.314 1.79 1.92286 20.9 22 -299.310 0.90 1.87400 35.3 23 18.641 (variable) 24 -19.345 1.00 1.85478 24.8 25 -25.976 (variable) 26 -339.660 8.22 1.59282 68.6 27 -33.588 21.75 Image plane ∞ Aspheric data 2nd side K = 0.00000e+00 A 4= 1.00150e-07 A 6=-7.95946e-10 A 8=-4.40810e-12 A10=-4.57871e-15 9th page K = 0.00000e+00 A 4=-8.41099e-06 A 6=-1.53412e-09 A 8= 1.04408e-10 Side 10 K = 0.00000e+00 A 4= 2.26558e-05 A 6=-1.07080e-08 A 8= 2.06328e-10 A10=-1.62470e-13 Page 17 K = 0.00000e+00 A 4=-4.76412e-06 A 6= 2.31973e-09 A 8=-1.06887e-10 Various data Zoom ratio 2.83 Wide-angle Mid-range Telephoto Focal length 20.60 34.01 58.20 F-number 4.08 4.08 4.12 Half angle of view (°) 41.80 30.66 19.84 Image height 18.42 20.16 21.00 Lens total length 130.00 130.00 130.00 BF 21.75 21.75 21.75 d 8 36.95 19.22 1.50 d17 1.50 3.79 8.83 d20 1.40 1.50 6.77 d23 5.76 9.23 12.56 d25 2.19 14.05 18.14 Lens group data Group starting plane focal length 1 1 -32.14 2 9 33.97 3 18 85.67 4 21 -47.52 5 24 -95.28 6 26 62.25 [Numerical Example 3] Unit: mm Surface Data Surface number rd nd νd 1 52.853 1.50 1.90043 37.4 2 21.652 7.89 3* 40.227 2.00 1.85150 40.8 4* 24.205 5.83 5 -370.096 1.00 1.43875 94.7 6 119.211 0.15 7 40.885 5.00 1.85478 24.8 8 -33712.149 (variable) 9 -45.230 1.00 1.59282 68.6 10 316.812 (variable) 11* 22.154 5.44 1.58313 59.4 12* -90.332 3.43 13 (Aperture) ∞ 4.04 14 132.667 0.90 1.67300 38.1 15 14.796 6.18 1.49700 81.7 16 -42.232 (variable) 17 60.861 0.90 1.75520 27.5 18 27.836 2.14 1.81600 46.6 19 603.626 (variable) 20 28.304 0.90 1.88300 40.8 21 16.595 6.96 22* -45.236 1.70 1.58313 59.4 23* -472.987 (variable) 24 -88.765 6.36 1.79952 42.2 25 -30.003 20.55 Image plane ∞ Aspheric data 3rd page K = 0.00000e+00 A 4=-6.07335e-07 A 6=-1.05195e-08 A 8=-1.37728e-11 Side 4 K = 0.00000e+00 A 4=-9.75389e-06 A 6=-2.82828e-08 A 8=-5.36527e-11 A10= 1.46783e-14 Page 11 K = 0.00000e+00 A 4=-6.09035e-06 A 6= 6.82238e-08 A 8=-8.03511e-10 A10= 6.40376e-12 Side 12 K = 0.00000e+00 A 4= 1.58212e-05 A 6= 6.93481e-08 A 8=-8.12604e-10 A10= 7.21631e-12 Page 22 K = 0.00000e+00 A 4=-1.29529e-04 A 6= 4.31087e-07 A 8=-5.21282e-09 Page 23 K = 0.00000e+00 A 4=-1.06295e-04 A 6= 4.38325e-07 A 8=-3.52857e-09 A10= 6.32982e-12 Various data Zoom ratio 2.35 Wide-angle Mid-range Telephoto Focal length 18.56 28.91 43.65 F-number 4.08 4.08 4.12 Half angle of view (°) 46.44 36.66 26.37 Image height 19.52 21.52 21.64 Lens total length 125.00 125.00 125.00 BF 20.55 20.55 20.55 d 8 9.05 11.82 9.05 d10 26.16 11.00 1.40 d16 3.01 5.12 8.79 d19 1.40 4.61 10.28 d23 1.50 8.57 11.60 Lens group data Group starting plane focal length 1 1 -58.43 2 9 -66.70 3 11 29.28 4 17 75.42 5 20 -29.09 6 24 54.09 [Numerical Example 4] Unit: mm Surface Data Surface number rd nd νd 1 50.937 2.00 1.80400 46.5 2 22.411 5.21 3 47.167 1.75 1.72916 54.7 4 22.933 7.66 5 -63.205 1.32 1.49700 81.7 6 84.858 0.32 7 40.385 3.39 1.90110 27.1 8 130.676 (variable) 9* 25.932 5.92 1.58313 59.4 10* -37.163 3.65 11 -233.055 0.90 1.85451 25.2 12 89.620 2.90 13 (Aperture) ∞ 1.71 14 -188.407 0.90 1.65412 39.7 15 36.033 1.34 16 61.541 4.86 1.49700 81.7 17 -21.416 (variable) 18 33.132 4.25 1.49700 81.7 19 -28.930 0.90 1.51742 52.4 20 245.654 (variable) 21 25.961 0.90 1.51633 64.1 22 16.049 7.38 23* -30.871 1.93 1.58313 59.4 24* -998.588 (variable) 25 -212.830 7.33 1.69680 55.5 26 -34.333 13.50 Image plane ∞ Aspheric data 9th page K = 0.00000e+00 A 4=-1.44546e-05 A 6=-1.56206e-08 A 8= 9.70937e-11 A10=-7.94212e-13 Side 10 K = 0.00000e+00 A 4= 1.40293e-05 A 6=-1.58162e-08 A 8= 1.14711e-10 A10=-7.86686e-13 Page 23 K = 0.00000e+00 A 4=-8.33679e-05 A 6= 1.44774e-07 A 8=-2.15841e-09 A10= 5.99141e-12 Page 24 K = 0.00000e+00 A 4=-6.76688e-05 A 6= 2.20908e-07 A 8=-1.24307e-09 A10= 3.08199e-12 Various data Zoom ratio 2.35 Wide-angle Mid-range Telephoto Focal length 20.60 31.72 48.50 F-number 4.08 4.08 4.12 Half angle of view (°) 41.61 32.32 23.58 Image height 18.30 20.07 21.17 Lens length 115.31 115.31 115.31 BF 13.50 13.50 13.50 d 8 27.50 14.50 1.50 d17 1.55 5.49 10.16 d20 2.45 2.62 8.28 d24 3.78 12.67 15.34 Lens group data Group starting plane focal length 1 1 -28.95 2 9 32.45 3 18 81.13 4 21 -31.67 5 25 57.78 [Numerical Example 5] Unit: mm Surface Data Surface number rd nd νd 1 62.531 1.80 1.90043 37.4 2 20.401 4.10 3 28.244 2.00 1.85400 40.4 4* 19.228 8.66 5 -47.773 1.40 1.49700 81.7 6 41.600 1.63 7 48.742 4.03 1.85478 24.8 8 -442.453 (variable) 9* 26.797 6.02 1.58313 59.4 10* -36.713 1.14 11 88.612 0.90 1.61340 44.3 12 30.696 7.29 13 (Aperture) ∞ 4.70 14 -300.889 0.90 1.85478 24.8 15 60.940 4.46 1.49700 81.7 16 -23.071 (variable) 17 36.182 3.07 1.49700 81.7 18 -49.365 0.90 1.77047 29.7 19 -115.133 (variable) 20 63.320 0.90 1.58913 61.1 21 20.981 5.95 22* -57.451 1.70 1.76450 49.1 23* -1000.000 (variable) 24 509.234 8.40 1.65160 58.5 25 -35.842 17.58 Image plane ∞ Aspheric data Side 4 K = 0.00000e+00 A 4=-1.21568e-05 A 6=-2.92679e-08 A 8= 7.68953e-12 A10=-2.98573e-13 9th page K = 0.00000e+00 A 4=-1.69030e-05 A 6=-2.17045e-08 A 8= 4.58570e-11 A10= 6.58959e-14 Side 10 K = 0.00000e+00 A 4= 1.18029e-05 A 6=-2.79384e-08 A 8= 1.07697e-10 A10=-1.90682e-13 Page 22 K = 0.00000e+00 A 4=-1.26720e-04 A 6= 3.72083e-07 A 8=-1.50203e-09 A10=-2.64021e-12 Page 23 K = 0.00000e+00 A 4=-1.03004e-04 A 6= 4.73481e-07 A 8=-1.82251e-09 A10= 3.33962e-12 Various data Zoom ratio 2.06 Wide-angle Mid-range Telephoto Focal length 16.48 23.58 33.95 F-number 4.08 4.08 4.12 Half angle of view (°) 47.56 40.29 32.40 Image height 18.02 19.99 21.54 Lens total length 118.00 118.00 118.00 BF 17.58 17.58 17.58 d 8 23.92 12.66 1.40 d16 1.40 4.22 7.89 d19 2.64 4.18 9.74 d23 2.52 9.42 11.46 Lens group data Group starting plane focal length 1 1 -21.85 2 9 32.37 3 17 67.44 4 20 -30.80 5 24 51.70 [Numerical Example 6] Unit: mm Surface Data Surface number rd nd νd 1 46.953 2.00 1.80400 46.5 2 21.356 5.35 3 42.819 1.25 1.61800 63.4 4 22.934 7.93 5 -58.865 1.19 1.49700 81.7 6 65.541 0.31 7 38.855 3.27 1.90110 27.1 8 104.133 (variable) 9* 29.845 4.56 1.58313 59.4 10* -44.171 3.70 11 446.638 0.90 1.76182 26.5 12 53.635 3.75 13 (Aperture) ∞ 3.91 14 800.000 0.85 1.61340 44.3 15 25.168 6.12 1.49700 81.7 16 -24.238 (variable) 17 32.742 4.13 1.49700 81.7 18 -32.972 1.05 1.51742 52.4 19 191.981 (variable) 20 23.012 0.90 1.51633 64.1 21 14.870 7.20 22* -26.367 2.00 1.58313 59.4 23* -300.000 (variable) 24 -322.629 7.53 1.65160 58.5 25 -34.000 13.50 Image plane ∞ Aspheric data 9th page K = 0.00000e+00 A 4=-1.22200e-05 A 6=-1.30528e-08 A 8= 1.66705e-10 A10= 1.61469e-14 Side 10 K = 0.00000e+00 A 4= 9.41880e-06 A 6=-1.21827e-08 A 8= 1.93208e-10 Page 22 K = 0.00000e+00 A 4=-6.57431e-05 A 6= 1.62758e-07 A 8= 1.15618e-09 A10=-8.17630e-11 A12= 4.61761e-13 Page 23 K = 0.00000e+00 A 4=-5.36868e-05 A 6= 3.36296e-07 A 8=-3.43301e-09 A10= 1.01095e-11 Various data Zoom ratio 2.35 Wide-angle Mid-range Telephoto Focal length 20.60 31.77 48.50 F-number 4.08 4.08 4.12 Half angle of view (°) 41.54 32.30 23.66 Image height 18.25 20.09 21.25 Lens length 116.79 116.79 116.79 BF 13.50 13.50 13.50 d 8 27.43 14.43 1.43 d16 1.95 5.56 10.42 d19 2.69 3.09 8.72 d23 3.33 12.32 14.83 Lens group data Group starting plane focal length 1 1 -28.28 2 9 32.51 3 17 83.12 4 20 -29.98 5 24 57.73 [Numerical Example 7] Unit: mm Surface Data Surface number rd nd νd 1 33.149 1.50 1.95375 32.3 2 20.747 6.16 3 37.514 2.20 1.91082 35.2 4 20.517 7.76 5 -86.146 1.00 1.49700 81.7 6 44.315 1.58 7 34.512 3.58 1.85478 24.8 8 164.815 (variable) 9* 17.447 6.60 1.58313 59.4 10* -35.367 2.08 11 (Aperture) ∞ 1.50 12 46.292 0.90 1.85451 25.2 13 16.328 2.07 14 -16.613 1.47 1.49700 81.7 15 -12.326 (variable) 16 21.750 1.20 1.73800 32.3 17 15.280 2.28 1.49700 81.7 18 89.083 (variable) 19 75.588 3.00 1.84666 23.9 20 -54.732 0.90 1.95375 32.3 21 47.079 5.67 22* -40.258 2.50 1.53504 55.7 23* -90.102 (variable) Image plane ∞ Aspheric data 9th page K = 0.00000e+00 A 4=-4.03996e-05 A 6=-1.61494e-07 A 8=-1.09460e-09 A10=-1.16939e-11 Side 10 K = 0.00000e+00 A 4= 2.15083e-05 A 6=-1.76542e-07 A 8=-1.96137e-09 A10= 3.48352e-12 Page 22 K = 0.00000e+00 A 4=-8.94279e-05 A 6=-8.41145e-07 A 8= 4.86754e-09 Page 23 K = 0.00000e+00 A 4=-8.02127e-05 A 6=-3.42404e-07 A 8= 2.28946e-09 A10=-6.59050e-13 Various data Zoom ratio 2.35 Wide-angle Mid-range Telephoto Focal length 20.60 31.82 48.50 F-number 3.61 4.69 5.83 Half angle of view (°) 42.64 32.68 23.77 Image height 18.97 20.41 21.36 Lens length 99.74 99.74 99.74 BF 14.49 25.65 29.35 d 8 25.32 13.41 1.50 d15 1.50 5.23 8.27 d18 4.48 1.50 6.68 d23 14.49 25.65 29.35 Lens group data Group starting plane focal length 1 1 -31.31 2 9 31.46 3 16 75.54 4 19 -55.82 The values ​​of the formulas (1) to (10) in the numerical examples 1 to 7 are summarized in the following Table 1. The numerical examples 1 to 7 all satisfy the conditions of the formulas (1) to (10).

[0112] [Table 1]

[0113] [Imaging device] 15 shows a digital still camera (image capture device) that uses the zoom lens L0 of any of Examples 1 to 7 as its image capture optical system. Reference numeral 10 denotes a camera body, and 11 denotes an image capture optical system 11 configured with the zoom lens L0 of any of Examples 1 to 7. Reference numeral 12 denotes an image capture element (photoelectric conversion element) such as a CCD sensor or CMOS sensor that is built into the camera body 10 and receives and photoelectrically converts an optical image formed by the image capture optical system 11 (images an object through the image capture optical system 11).

[0114] The camera body 10 may be a single-lens reflex camera having a quick-turn mirror, or may be a mirrorless camera having no quick-turn mirror.

[0115] In this way, by using the zoom lens L0 of each embodiment in an imaging device, it is possible to provide a small imaging device that can obtain good captured images.

[0116] [Imaging system] A surveillance camera may be configured as an imaging system (imaging device) including the zoom lens L0 of any of the first to seventh embodiments and a control unit that controls the zoom lens L0. The control unit controls the movement of the variable magnification lens group, focus lens group, and vibration reduction lens group when zooming, focusing, and vibration reduction of the zoom lens L0. The control unit may be built into a lens device that includes the zoom lens L0, or may be configured as a separate entity from the lens device so that the zoom lens L0 can be remotely controlled.

[0117] Alternatively, by connecting an operating member such as a button to the control unit, the control unit may control the zoom lens L0 in response to a user operation on the operating unit. For example, the control unit may control the zoom lens L0 so that the focal length of the zoom lens L0 increases when the user operates a zoom-in button, and decreases when the user operates a zoom-out button.

[0118] The imaging system may also have a display unit that displays information about zooming of the zoom lens L0 (such as zoom position). The zooming information includes, for example, zoom magnification, focal length, and the position of the variable magnification lens group. A user can remotely operate the zoom lens L0 via an operation unit while viewing the zooming information displayed on the display unit. The operation unit may also include a touch panel provided on the display unit.

[0119] The above embodiment includes the following configurations.

[0120] (Configuration 1) the first lens group having negative refractive power, the middle lens group having positive refractive power as a whole, and the subsequent lens group having negative refractive power as a whole, which are arranged in this order from the object side to the image side; the intermediate group includes a first intermediate lens group having positive refractive power and a second intermediate lens group having positive refractive power adjacent to the first intermediate lens group on the image side, During zooming, the first lens group remains stationary, the first intermediate lens group and the second intermediate lens group move, and the spacing between adjacent lens groups changes; the first lens group includes two or more lenses, Let mp1 be the amount of movement of the first intermediate lens group during zooming from the wide-angle end to the telephoto end, mp2 be the amount of movement of the second intermediate lens group during zooming from the wide-angle end to the telephoto end, fp1 be the focal length of the first intermediate lens group, fp2 be the focal length of the second intermediate lens group, fw be the focal length of the zoom lens at the wide-angle end, ft be the focal length of the zoom lens at the telephoto end, and TTLw be the sum of the distance on the optical axis from the lens surface closest to the object to the lens surface closest to the image of the zoom lens at the wide-angle end and the air-equivalent distance on the optical axis from the lens surface closest to the image to the image plane. 0.10≦│mp2 / mp1│≦0.82 1.23≦fp2 / fp1≦10.00 1.50≦ft / fw≦6.00 0.10≦TTLw / fw≦10.00 A zoom lens characterized by satisfying the following conditions: (Configuration 2) The zoom lens according to configuration 1, wherein the object-side lens surface of the lens closest to the object side in the subsequent group has a convex shape facing the object side. (Configuration 3) The zoom lens according to configuration 1 or 2, wherein an aperture stop is disposed on the object side of the second intermediate lens unit in the intermediate lens group. (Configuration 4) When the composite focal length of the subsequent lens group at the wide-angle end is frw and the focal length of the first intermediate lens group is fp1, 0.73≦(-frw) / fp1≦2.04 4. The zoom lens according to any one of configurations 1 to 3, wherein the following condition is satisfied: (Configuration 5) 5. The zoom lens according to any one of configurations 1 to 4, wherein the subsequent group includes two or more lenses. (Configuration 6) The zoom lens according to configuration 5, wherein a biconvex air lens is formed between two adjacent lenses included in the subsequent group. (Configuration 7) The zoom lens according to any one of configurations 1 to 6, wherein the first lens group includes a first negative meniscus lens having a convex shape facing the object side, and a second negative meniscus lens having a convex shape facing the object side, arranged in this order from the object side to the image side. (Configuration 8) 8. The zoom lens according to any one of configurations 1 to 7, wherein the second intermediate lens group includes a cemented lens in which a positive lens and a negative lens are cemented together. (Configuration 9) 9. The zoom lens according to any one of configurations 1 to 8, wherein the first intermediate lens group, the second intermediate lens group, and the subsequent lens group all move toward the object side during zooming from the wide-angle end to the telephoto end. (Configuration 10) When a composite focal length from the first lens group to the first intermediate lens group at the telephoto end is fat and a focal length of the zoom lens at the telephoto end is ft, 0.71≦fat / ft≦1.52 10. The zoom lens according to any one of configurations 1 to 9, wherein the following condition is satisfied: (Configuration 11) When the air-equivalent distance on the optical axis from the lens surface closest to the image side of the zoom lens at the wide-angle end to the image plane is Skw, and the focal length of the zoom lens at the wide-angle end is fw, 0.46≦BFw / fw≦1.44 11. The zoom lens according to any one of configurations 1 to 10, wherein the following condition is satisfied: (Configuration 12) When the focal length of the first lens group is f1 and the focal length of the first intermediate lens group is fp1, 0.54≦(-f1) / fp1≦2.29 12. The zoom lens according to any one of configurations 1 to 11, wherein the following condition is satisfied: (Configuration 13) a first subsequent lens group is disposed closest to the object side of the subsequent lens group; When the amount of movement of the first subsequent lens unit during zooming from the wide-angle end to the telephoto end is mn1, 0.32≦│mn1 / mp1│≦0.77 13. The zoom lens according to any one of configurations 1 to 12, wherein the following condition is satisfied: (Configuration 14) Let Nave be the average value of the refractive index at the d line of the glass materials used for all lenses included in all lens groups that move during zooming. 1.45≦Nave≦1.80 14. The zoom lens according to any one of configurations 1 to 13, wherein the following condition is satisfied: (Configuration 15) 15. The zoom lens according to any one of configurations 1 to 14, wherein the first intermediate lens group includes an aspherical lens with positive refractive power. (Configuration 16) 16. The zoom lens according to any one of configurations 1 to 15, wherein all of the lens groups included in the subsequent group have negative refractive power. (Configuration 17) 17. The zoom lens according to any one of configurations 1 to 16, wherein the subsequent lens group is adjacent to the second intermediate lens group on the image side. (Configuration 18) 18. A zoom lens according to any one of configurations 1 to 17, wherein all of the lens groups included in the subsequent group move toward the image side during focusing from infinity to a close distance. (Configuration 19) a final lens group having a positive refractive power is disposed closer to the image side than the subsequent lens group; 19. The zoom lens according to any one of configurations 1 to 18, wherein the final lens group is stationary during zooming. (Configuration 20) 20. The zoom lens according to any one of configurations 1 to 19, wherein all lens groups that move during zooming in the zoom lens are electrically driven. (Configuration 21) the first lens group having negative refractive power, the middle lens group having positive refractive power as a whole, and the subsequent lens group having negative refractive power as a whole, which are arranged in this order from the object side to the image side; the intermediate group includes a first intermediate lens group having positive refractive power and a second intermediate lens group having positive refractive power adjacent to the first intermediate lens group on the image side, During zooming, the first lens group remains stationary, the first intermediate lens group and the second intermediate lens group move, and the spacing between adjacent lens groups changes; the first lens group includes three or more lenses, When the focal length of the zoom lens at the wide-angle end is fw and the focal length of the zoom lens at the telephoto end is ft, 1.50≦ft / fw≦6.00 A zoom lens characterized by satisfying the following conditions: (Configuration 22) the first lens group having negative refractive power, the middle lens group having positive refractive power as a whole, and the subsequent lens group having negative refractive power as a whole, which are arranged in this order from the object side to the image side; the intermediate group includes a first intermediate lens group having positive refractive power and a second intermediate lens group having positive refractive power adjacent to the first intermediate lens group on the image side, During zooming, the first lens group remains stationary, the first intermediate lens group and the second intermediate lens group move, and the spacing between adjacent lens groups changes; the first lens group includes two or more lens elements; Let mp1 be the amount of movement of the first intermediate lens group during zooming from the wide-angle end to the telephoto end, mp2 be the amount of movement of the second intermediate lens group during zooming from the wide-angle end to the telephoto end, fp1 be the focal length of the first intermediate lens group, fp2 be the focal length of the second intermediate lens group, fw be the focal length of the zoom lens at the wide-angle end, ft be the focal length of the zoom lens at the telephoto end, and TTLw be the sum of the distance on the optical axis from the lens surface closest to the object to the lens surface closest to the image of the zoom lens at the wide-angle end and the air-equivalent distance on the optical axis from the lens surface closest to the image to the image plane. 0.10≦│mp2 / mp1│≦0.82 1.23≦fp2 / fp1≦10.00 1.50≦ft / fw≦6.00 0.10≦TTLw / fw≦10.00 A zoom lens characterized by satisfying the following conditions: (Configuration 23) the zoom lens according to any one of configurations 1 to 22; and an image sensor for capturing an image of a subject through the zoom lens.

[0121] (Other Examples) The present invention can also be realized by supplying a program that realizes one or more functions of the above-described embodiments to a system or device via a network or a storage medium, and having one or more processors in the computer of the system or device read and execute the program.The present invention can also be realized by a circuit (e.g., ASIC) that realizes one or more functions.

[0122] The embodiments described above are merely representative examples, and various modifications and alterations are possible to each embodiment when implementing the present invention. [Explanation of symbols]

[0123] L0 zoom lens L1 First lens group LM intermediate group Lmp1 First intermediate lens group Lmp2 Second intermediate lens group LR successor group

Claims

1. the first lens group having negative refractive power, the intermediate lens group having positive refractive power as a whole, and the subsequent lens group having negative refractive power as a whole, which are arranged in this order from the object side to the image side; the intermediate group includes a first intermediate lens group having a positive refractive power and a second intermediate lens group having a positive refractive power adjacent to the first intermediate lens group on the image side, During zooming, the first lens group remains stationary, the first intermediate lens group and the second intermediate lens group move, and the interval between adjacent lens groups changes; the first lens group includes two or more lenses, Let mp1 be the amount of movement of the first intermediate lens group during zooming from the wide-angle end to the telephoto end, mp2 be the amount of movement of the second intermediate lens group during zooming from the wide-angle end to the telephoto end, fp1 be the focal length of the first intermediate lens group, fp2 be the focal length of the second intermediate lens group, fw be the focal length of the zoom lens at the wide-angle end, ft be the focal length of the zoom lens at the telephoto end, and TTLw be the sum of the distance on the optical axis from the lens surface closest to the object to the lens surface closest to the image at the wide-angle end of the zoom lens and the air-equivalent distance on the optical axis from the lens surface closest to the image to the image plane, 0.10≦|mp2 / mp1|≦0.82 1.23≦fp2 / fp1≦10.00 1.50≦ft / fw≦6.00 0.10≦TTLw / fw≦10.00 A zoom lens characterized by satisfying the following conditions:

2. 2. The zoom lens according to claim 1, wherein the object-side lens surface of the lens closest to the object side in the subsequent group has a convex shape facing the object side.

3. 2. The zoom lens according to claim 1, wherein an aperture stop is disposed on the object side of the second intermediate lens unit in the intermediate lens group.

4. When the composite focal length of the subsequent lens group at the wide-angle end is frw and the focal length of the first intermediate lens group is fp1, 0.73≦(-frw) / fp1≦2.04 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

5. 2. The zoom lens of claim 1, wherein the subsequent group includes two or more lenses.

6. 6. The zoom lens according to claim 5, wherein a biconvex air lens is formed between two adjacent lenses included in the rear group.

7. 2. The zoom lens according to claim 1, wherein the first lens group includes, arranged in order from the object side to the image side, a first negative meniscus lens having a convex shape facing the object side, and a second negative meniscus lens having a convex shape facing the object side.

8. 2. The zoom lens according to claim 1, wherein the second intermediate lens group includes a cemented lens in which a positive lens and a negative lens are cemented together.

9. 2. The zoom lens according to claim 1, wherein the first intermediate lens unit, the second intermediate lens unit, and the subsequent lens unit all move toward the object side during zooming from the wide-angle end to the telephoto end.

10. When a composite focal length from the first lens group to the first intermediate lens group at the telephoto end is fat and a focal length of the zoom lens at the telephoto end is ft, 0.71≦fat / ft≦1.52 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

11. When the air-equivalent distance on the optical axis from the lens surface closest to the image side of the zoom lens at the wide-angle end to the image plane is Skw and the focal length of the zoom lens at the wide-angle end is fw, 0.46≦BFw / fw≦1.44 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

12. When the focal length of the first lens group is f1 and the focal length of the first intermediate lens group is fp1, 0.54≦(-f1) / fp1≦2.29 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

13. a first subsequent lens group is disposed closest to the object side of the subsequent lens group; When the amount of movement of the first subsequent lens unit during zooming from the wide-angle end to the telephoto end is mn1, 0.32≦|mn1 / mp1|≦0.77 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

14. When the average value of the refractive index at the d line of the glass materials used for all the lenses included in all the lens groups that move during zooming is Nave, 1.45≦Nave≦1.80 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

15. 2. The zoom lens according to claim 1, wherein the first intermediate lens group includes an aspherical lens having a positive refractive power.

16. 2. The zoom lens according to claim 1, wherein all of the lens groups included in the subsequent group have negative refractive power.

17. 2. The zoom lens according to claim 1, wherein the subsequent lens group is adjacent to the second intermediate lens group on the image side.

18. 2. The zoom lens according to claim 1, wherein all of the lens groups included in the subsequent group move toward the image side during focusing from infinity to a close distance.

19. a final lens group having a positive refractive power is disposed closer to the image side than the subsequent lens group; 2. The zoom lens according to claim 1, wherein the final lens group remains stationary during zooming.

20. 2. The zoom lens according to claim 1, wherein all lens groups that move during zooming are electrically driven.

21. the first lens group having negative refractive power, the intermediate lens group having positive refractive power as a whole, and the subsequent lens group having negative refractive power as a whole, which are arranged in this order from the object side to the image side; the intermediate group includes a first intermediate lens group having a positive refractive power and a second intermediate lens group having a positive refractive power adjacent to the first intermediate lens group on the image side, During zooming, the first lens group remains stationary, the first intermediate lens group and the second intermediate lens group move, and the interval between adjacent lens groups changes; the first lens group includes three or more lenses, When the focal length of the zoom lens at the wide-angle end is fw and the focal length of the zoom lens at the telephoto end is ft, 1.50≦ft / fw≦6.00 A zoom lens characterized by satisfying the following conditions:

22. the first lens group having negative refractive power, the intermediate lens group having positive refractive power as a whole, and the subsequent lens group having negative refractive power as a whole, which are arranged in this order from the object side to the image side; the intermediate group includes a first intermediate lens group having a positive refractive power and a second intermediate lens group having a positive refractive power adjacent to the first intermediate lens group on the image side, During zooming, the first lens group remains stationary, the first intermediate lens group and the second intermediate lens group move, and the interval between adjacent lens groups changes; the first lens group includes two or more lens elements; Let mp1 be the amount of movement of the first intermediate lens group during zooming from the wide-angle end to the telephoto end, mp2 be the amount of movement of the second intermediate lens group during zooming from the wide-angle end to the telephoto end, fp1 be the focal length of the first intermediate lens group, fp2 be the focal length of the second intermediate lens group, fw be the focal length of the zoom lens at the wide-angle end, ft be the focal length of the zoom lens at the telephoto end, and TTLw be the sum of the distance on the optical axis from the lens surface closest to the object to the lens surface closest to the image at the wide-angle end of the zoom lens and the air-equivalent distance on the optical axis from the lens surface closest to the image to the image plane, 0.10≦|mp2 / mp1|≦0.82 1.23≦fp2 / fp1≦10.00 1.50≦ft / fw≦6.00 0.10≦TTLw / fw≦10.00 A zoom lens characterized by satisfying the following conditions:

23. a zoom lens according to any one of claims 1 to 22; and an image sensor for capturing an image of a subject through the zoom lens.

Images