Zoom lens and imaging apparatus having the same

Abstract

To provide a zoom lens that has a high variable power ratio and high optical performance and is capable of incorporating an electrically-driven zoom function.SOLUTION: A zoom lens comprises, in order from an object side to an image side, a first lens group L1 having negative refractive power, a second lens group L2, an intermediate group LM having one or more lens groups, and a final lens group LN. The zoom lens is configured such that respective intervals between adjacent lens groups change during zooming. The first lens group L1 includes two or more lenses. The intermediate group LM includes a first intermediate lens group Lm1 and a second intermediate lens group Lm2 disposed adjacently to the image side of the first intermediate lens group Lm1. The first lens group L1 and the first intermediate lens group Lm1 are immobile during zooming. A distance on the optical axis from the surface apex of the lens surface on the most object side of the first lens group L1 to the surface apex of the lens surface on the most image side of the first lens group L1 or the like is appropriately set.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an optical system suitable for digital video cameras, digital still cameras, broadcast cameras, cameras for silver halide film, surveillance cameras, and the like. [Background technology]

[0002] In recent years, zoom lenses equipped with an electric zoom function have become desirable because they are suitable for video shooting and the like.

[0003] Patent Document 1 discloses a negative-lead type zoom lens that achieves both a high zoom ratio and high optical performance by moving each lens group including the first lens group during zooming. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-196449 Summary of the Invention [Problem to be solved by the invention]

[0005] It is preferable that the movable group in a zoom lens is small and lightweight, and that the amount of movement of the movable group is small. In the zoom lens of Patent Document 1, the first lens group is moved during zooming. The first lens group is relatively heavy, and moving a heavy lens group may degrade the optical performance.

[0006] An object of the present invention is to provide a zoom lens that has a high zoom ratio and high optical performance and can be equipped with an electric zoom function. [Means for solving the problem]

[0007] The zoom lens of the present invention is a zoom lens that comprises, in order from the object side to the image side, a first lens group having negative refractive power, a second lens group, an intermediate group having one or more lens groups, and a final lens group, and the distance between adjacent lens groups changes during zooming. The first lens group has two or more lenses, and the intermediate group has a first intermediate lens group and a second intermediate lens group arranged adjacent to the image side of the first intermediate lens group, the first lens group and the first intermediate lens group do not move during zooming, and a distance between the first lens group and the final lens group changes during zooming. Let D1 be the distance on the optical axis to the vertex of the lens surface closest to the image in the first lens group, TLw be the distance on the optical axis from the vertex of the lens surface closest to the object in the zoom lens to the vertex of the lens surface closest to the image in the zoom lens at the wide-angle end, Skw be the air-equivalent distance on the optical axis from the vertex of the lens surface closest to the image in the zoom lens to the image plane at the wide-angle end, fw be the focal length of the entire system at the wide-angle end of the zoom lens, ft be the focal length of the entire system at the telephoto end of the zoom lens, and νdn be the largest Abbe number among the Abbe numbers of the materials of the negative lenses included in the first lens group. 0.04 <D1 / TLw<0.25 0.05 <Skw / fw<1.50 1.65 <ft / fw<6.00 νdn>50 The present invention is characterized in that the following conditional expression is satisfied: Effect of the Invention

[0008] According to the present invention, a zoom lens that has a high zoom ratio and high optical performance and can be equipped with an electric zoom function is provided. [Brief description of the drawings]

[0009] [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 end, and a telephoto end. [Diagram 2] 3A, 3B, and 3C are aberration diagrams of the zoom lens according to Example 1 at the wide-angle end, at the intermediate zoom position, and at the telephoto end when focused on infinity. [Diagram 3]11A to 11C are cross-sectional views of a zoom lens of a second embodiment at a wide-angle end, a middle end, and a telephoto end. [Figure 4] 5A, 5B, and 5C are aberration diagrams of the zoom lens according to Example 2 at the wide-angle end, at the intermediate zoom position, and at the telephoto end when focused on infinity. [Diagram 5] 11A to 11C are cross-sectional views of a zoom lens of a third embodiment at a wide-angle end, a middle end, and a telephoto end. [Figure 6] 13A, 13B, and 13C are aberration diagrams of the zoom lens according to Example 3 at the wide-angle end, at the intermediate zoom position, and at the telephoto end when focused on infinity. [Figure 7] 11A to 11C are cross-sectional views of a zoom lens according to a fourth embodiment at a wide-angle end, a middle end, and a telephoto end. [Figure 8] 13A, 13B, and 13C are aberration diagrams of the zoom lens according to Example 4 at the wide-angle end, at the intermediate zoom position, and at the telephoto end when focused on infinity. [Figure 9] 13A to 13C are cross-sectional views of a zoom lens of a fifth embodiment at a wide-angle end, a middle end, and a telephoto end. [Figure 10] 13A, 13B, and 13C are aberration diagrams of the zoom lens according to Example 5 at the wide-angle end, at the intermediate zoom position, and at the telephoto end when focused on infinity. [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 end, and a telephoto end. [Figure 12] 13A, 13B, and 13C are aberration diagrams of the zoom lens according to Example 6 at the wide-angle end, at the intermediate zoom position, and at the telephoto end when focused on infinity. [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 end, and a telephoto end. [Figure 14] 13A, 13B, and 13C are aberration diagrams of the zoom lens according to Example 7 at the wide-angle end, at the intermediate zoom position, and at the telephoto end when focused on infinity. [Figure 15] 13A to 13C are cross-sectional views of a zoom lens according to an eighth embodiment at a wide-angle end, a middle end, and a telephoto end. [Figure 16] 13A, 13B, and 13C are aberration diagrams of the zoom lens according to Example 8 at the wide-angle end, at the intermediate zoom position, and at the telephoto end when focused on infinity. [Figure 17]13A to 13C are cross-sectional views of a zoom lens according to a ninth embodiment at a wide-angle end, a middle end, and a telephoto end. [Figure 18] 13A, 13B, and 13C are aberration diagrams of the zoom lens according to Example 9 at the wide-angle end, at the intermediate zoom position, and at the telephoto end when focused on infinity. [Figure 19] 23A to 23C are cross-sectional views of a zoom lens of a tenth embodiment at a wide-angle end, a middle end, and a telephoto end. [Figure 20] 13A, 13B, and 13C are aberration diagrams of the zoom lens of Example 10 at the wide-angle end, at the intermediate zoom position, and at the telephoto end when focused on infinity. [Figure 21] 13A to 13C are cross-sectional views of a zoom lens of Example 11 at a wide-angle end, a middle end, and a telephoto end. [Figure 22] 15A, 15B, and 15C are aberration diagrams of the zoom lens of Example 11 at the wide-angle end, at the intermediate zoom position, and at the telephoto end when focused on infinity. [Figure 23] 12A to 12C are cross-sectional views of a zoom lens of Example 12 at a wide-angle end, a middle end, and a telephoto end. [Figure 24] 15A, 15B, and 15C are aberration diagrams of the zoom lens of Example 12 at the wide-angle end, at the intermediate zoom position, and at the telephoto end when focused on infinity. [Diagram 25] 23A to 23C are cross-sectional views of a zoom lens of Example 13 at a wide-angle end, a middle end, and a telephoto end. [Figure 26] 23A, 23B, and 23C are aberration diagrams of the zoom lens of Example 13 at the wide-angle end, at the intermediate zoom position, and at the telephoto end when focused on infinity. [Figure 27] FIG. 1 is a schematic diagram of an imaging device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Note that the drawings may be drawn at a scale different from the actual scale for convenience. In addition, in each drawing, the same reference numerals are used for the same components, and duplicated explanations will be omitted.

[0011] 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, and 25 are cross-sectional views of the zoom lenses of Examples 1 to 13, respectively. In each figure, the left side is the object side (front side), and the right side is the image side (rear side). The zoom lens L0 according to each example is configured with a plurality of lens groups, and the intervals between adjacent lens groups change during zooming. Note that the lens groups may be configured with one lens, or may be configured with a plurality of lenses.

[0012] In each figure, Li is the i-th lens group (i is a natural number) counted from the object side among the lens groups included in the zoom lens L0. LM is an intermediate group having one or more lens groups, and Lmi is the i-th lens group (i is a natural number) counted from the lens group including the vibration reduction group among the lens groups included in the intermediate group LM toward the image side. Also, LN is the final lens group arranged closest to the image side.

[0013] In each figure, SP denotes an aperture stop that determines the light flux of the open F-number (Fno), and IP denotes an image plane. When the zoom lens L0 of each embodiment is used as an imaging optical system for a digital video camera or digital still camera, the imaging surface of a solid-state imaging element (photoelectric conversion element) is disposed on the image plane IP. A CCD (Charge Coupled Device) sensor or a CMOS (Complementary Metal Oxide Semiconductor) sensor can be used as the solid-state imaging element. When the zoom lens L0 of each embodiment is used as an imaging optical system for a silver halide film camera, the photosensitive surface of the film is disposed on the image plane IP.

[0014] The zoom lens of each embodiment may be used as a projection lens for a projector, etc. In this case, the left side is the screen side and the right side is the projected image side.

[0015] In each diagram, the solid arrows indicate the trajectory of movement of each lens group during zooming from the wide-angle end to the telephoto end, and the solid arrows are attached below the lens groups that move in the optical axis direction during zooming. Also, the image stabilization group IS moves as shown by the up and down arrows during image blur correction.

[0016] The dashed arrows in each drawing indicate the locus of movement of each lens group during focusing from infinity to a close distance (close end), and the dashed arrows are shown above the lens groups that move during focusing.

[0017] 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 and 26 are aberration diagrams of the zoom lenses of Examples 1 to 13 when focused on an object distance of infinity at the wide-angle end, respectively.

[0018] In each diagram, Fno is the F-number, and ω is the imaging half angle of view (°) determined by paraxial calculation. In the spherical aberration diagrams, the solid line shows spherical aberration at the d-line (wavelength 587.56 nm), and the two-dot chain line shows spherical aberration at the g-line (wavelength 435.835 nm). In the astigmatism diagrams, the solid line shows astigmatism at the d-line on the sagittal image plane, and the dashed line shows astigmatism at the d-line on 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.

[0019] Next, the characteristic configuration of the zoom lens L0 of each embodiment will be described.

[0020] The zoom lens L0 of each embodiment is composed of a first lens group L1 having a negative refractive power, a second lens group L2, an intermediate group LM having one or more lens groups, and a final lens group LN, which are arranged in this order from the object side to the image side. The first lens group L1 has two or more lenses. The intermediate group LM has a first intermediate lens group Lm1 and a second intermediate lens group Lm2 arranged adjacent to the image side of the first intermediate lens group Lm1. In addition, the first lens group L1 and the first intermediate lens group Lm1 are immovable with respect to the image surface IP during zooming. The lenses included in the first lens group L1 have a large outer diameter, so they tend to be heavy. Therefore, by making the first lens group L1 immovable during zooming, it is possible to realize fast and quiet zooming. Furthermore, it is possible to suppress the inclination of the first lens group L1 that occurs during zooming.

[0021] In the zoom lens L0 of each embodiment, the first intermediate lens group Lm1 is stationary with respect to the image plane IP, and the second lens group L2 and the second intermediate lens group Lm2 move toward the object side during zooming from the wide-angle end to the telephoto end. A variable magnification function can be realized by moving the second lens group L2 and the second intermediate lens group Lm2, both of which have positive refractive power, toward the object side so as to approach each other relative to the first lens group L1 and the first intermediate lens group Lm1, both of which have negative refractive power.

[0022] Furthermore, by arranging the first intermediate lens unit Lm1, which does not move during zooming, the amount of movement of the second lens unit L2 and the second intermediate lens unit Lm2 can be reduced when achieving high zoom ratios.

[0023] The zoom lens L0 in each embodiment is configured to satisfy the following conditional expressions.

[0024] Here, the distance on the optical axis from the surface vertex of the lens surface closest to the object in the first lens group L1 to the surface vertex of the lens surface closest to the image in the first lens group L1 is defined as D1. The distance on the optical axis from the surface vertex of the lens surface closest to the object in the zoom lens L0 to the surface vertex of the lens surface closest to the image in the zoom lens L0 at the wide-angle end is defined as TLw. The air-equivalent distance on the optical axis from the surface vertex of the lens surface closest to the image in the zoom lens L0 at the wide-angle end to the image plane in the wide-angle end is defined as Skw, and the focal length of the entire system at the wide-angle end of the zoom lens L0 is defined as fw. The focal length of the entire system at the telephoto end of the zoom lens L0 is defined as ft, and the largest Abbe number among the Abbe numbers of the materials of the negative lenses included in the first lens group L1 is defined as νdn. 0.04 <D1 / TLw<0.25 (1) 0.05 <Skw / fw<1.50 (2) 1.65 <ft / fw<6.00 (3) νdn>50 (4)

[0025] Conditional formula (1) defines the thickness of the first lens group L1 relative to the overall length of the zoom lens L0. If the upper limit of conditional formula (1) is exceeded, the first lens group L1 becomes too large. As a result, it is not preferable because a sufficient space cannot be secured to obtain the amount of movement of the movable group required for high zoom ratio. On the other hand, if the lower limit of conditional formula (1) is not satisfied, it is not preferable because it is not possible to arrange a lens required for satisfactorily correcting various aberrations occurring in the first lens group L1 or the overall length of the zoom lens L0 becomes too large.

[0026] Conditional formula (2) defines the ratio between the back focus and the focal length of the zoom lens L0 at the wide-angle end. If the upper limit of conditional formula (2) is exceeded, the total optical length becomes too long, which is undesirable. On the other hand, if the lower limit of conditional formula (2) is exceeded, the flange back cannot be sufficiently secured, which makes it difficult to arrange the shutter member, etc., which is also undesirable.

[0027] Conditional formula (3) defines the zoom ratio of the zoom lens L0. If the upper limit of conditional formula (3) is exceeded, the zoom ratio becomes too large. As a result, it becomes difficult to suppress zoom fluctuations in optical performance over the entire zoom range, which is undesirable. On the other hand, if the lower limit of conditional formula (3) is exceeded, it becomes difficult to achieve a sufficiently high zoom ratio, which is also undesirable.

[0028] Conditional formula (4) regulates the dispersion of the material of one of the negative lenses in the first lens group. If the lower limit of conditional formula (4) is not satisfied, the dispersion of the negative lens becomes too large. As a result, it becomes difficult to achieve first-order achromatism and second-order achromatism of lateral chromatic aberration at the wide-angle end, which is not preferable.

[0029] With the above configuration, it is possible to provide a zoom lens that has a high zoom ratio and high optical performance and can be equipped with an electric zoom function.

[0030] It is more preferable that the numerical ranges of the conditional expressions (1) to (4) be the numerical ranges of the following conditional expressions (1a) to (4a). 0.08 <D1 / TLw<0.23 (1a) 0.20 <Skw / fw<1.30 (2a) 1.75 <ft / fw<5.00 (3a) νdn>60 (4a)

[0031] It is further preferable that the numerical ranges of the conditional expressions (1) and (4) be the numerical ranges of the following conditional expressions (4b) and (4b). 0.10 <D1 / TLw<0.22 (1b) 0.30 <Skw / fw<1.10 (2b) 1.80 <ft / fw<4.00 (3b) νdn>65 (4b)

[0032] Next, conditions that the zoom lens L0 of each embodiment should preferably satisfy will be described.

[0033] It is preferable that the final lens group LN is stationary relative to the image plane IP. The lenses included in the final lens group LN have large outer diameters and tend to be heavy. By keeping the final lens group LN stationary during zooming, fast and quiet zooming can be achieved.

[0034] It is preferable that the first intermediate lens group Lm1 has an aperture stop SP. With this configuration, it is possible to reduce the size and weight of movable groups such as the second lens group L2 and the second intermediate lens group Lm2 arranged near the aperture stop SP. As a result, it is possible to realize good optical performance over the entire zoom range with high zoom ratio while reducing the load on the actuator that electrically moves the lens groups during zooming. Note that in order to more effectively suppress zoom fluctuations such as spherical aberration and curvature of field, a lens group that moves toward the object side during zooming from the wide-angle end to the telephoto end may be further arranged on the image side of the second lens group L2 and the second intermediate lens group Lm2.

[0035] It is preferable that the first lens group L1 has a lens with negative refractive power and a lens with positive refractive power, and by adopting such a configuration, various aberrations such as chromatic aberration and curvature of field occurring in the first lens group L1 can be effectively corrected.

[0036] It is preferable that the positive lens in the first lens group L1 is disposed closest to the image side in the first lens group L1. With this configuration, chromatic aberration occurring in the first lens group L1 can be corrected well. It is also preferable that the lens disposed closest to the object side in the first lens group L1 is a negative meniscus lens with a convex surface facing the object side. With this configuration, it is possible to make the zoom lens L0 wider-angle while correcting off-axis aberrations well.

[0037] It is preferable that the second intermediate lens group Lm2 has a lens including an aspheric lens surface. With this configuration, it is possible to effectively correct off-axis aberrations occurring at the wide-angle end while reducing the overall length of the zoom lens L0.

[0038] The focusing group that moves during focusing is preferably composed of a movable group or a part of a movable group that is arranged adjacent to the first lens group L1 on the image side, or adjacent to the final lens group LN on the object side. By using a small and lightweight movable group or a part of a movable group, the load on the actuator can be reduced, thereby achieving fast and quiet focusing.

[0039] It is preferable that a lens group having a negative refractive power is arranged on the image side of the second intermediate lens group Lm2. With this configuration, the second intermediate lens group Lm2 having a positive refractive power and the lens group having a negative refractive power are arranged side by side to form a telephoto type arrangement, so that the overall length of the zoom lens can be shortened. In particular, in the zoom lens L0 of Examples 1, 2, 3, 7, 8, 9, 10, 11, 12, and 13 described later, the third intermediate lens group Lm3 having a negative refractive power is arranged on the image side of the second intermediate lens group Lm2. With this configuration, the overall length of the zoom lens can be shortened. In addition, when zooming from the wide-angle end to the telephoto end, the third intermediate lens group Lm3 moves toward the object side while changing the distance between it and the second intermediate lens group Lm2, so that zoom fluctuations such as field curvature can be well corrected.

[0040] It is preferable that the first intermediate lens group Lm1 includes an anti-vibration group IS. The anti-vibration group IS is a mechanism that reduces blurring of a captured image by moving during image blur correction so as to include a component perpendicular to the optical axis. The anti-vibration group IS is, for example, composed of a cemented lens of one negative lens and one positive lens, and can suppress chromatic aberration fluctuation during image blur correction. The anti-vibration group IS can be disposed adjacent to the aperture stop SP, so that the anti-vibration group that moves for image blur correction can be made lighter. In addition, by mounting the anti-vibration group IS on a lens group that does not move with respect to the image plane IP during zooming, it is possible to provide an anti-vibration function without increasing the weight of movable groups such as the second lens group L2 and the second intermediate lens group Lm2.

[0041] It is preferable that the zoom lens L0 of each embodiment satisfy one or more of the following conditional expressions (5) to (14).

[0042] Here, the largest air gap among the air gaps on the optical axis in the first lens group is denoted by Da. The focal length of the first lens group L1 is denoted by f1, the focal length of the first intermediate lens group Lm1 is denoted by fm1, the focal length of the second intermediate lens group Lm2 is denoted by fm2, and the focal length of the third intermediate lens group Lm3 is denoted by fm3.

[0043] Also, fa_t is the composite focal length at the telephoto end of the lens disposed between the first lens group L1 and the first intermediate lens group Lm1. xa_t is the distance on the optical axis at the telephoto end from the surface vertex of the lens surface closest to the object of the lens disposed between the first lens group L1 and the first intermediate lens group Lm1 to the surface vertex of the lens surface closest to the object of the first intermediate lens group Lm1. xb_wt is the distance on the optical axis at the wide-angle end from the surface vertex of the lens surface closest to the image of the lens disposed between the first intermediate lens group Lm1 and the final lens group LN to the surface vertex of the lens surface closest to the image of the lens disposed between the first intermediate lens group Lm1 and the final lens group LN.

[0044] Furthermore, the largest movement amount of the lens group disposed between the first lens group L1 and the first intermediate lens group Lm1 during zooming from the wide-angle end to the telephoto end is defined as ma. The largest movement amount of the lens group disposed between the first intermediate lens group Lm1 and the final lens group LN during zooming from the wide-angle end to the telephoto end is defined as mb. Here, the movement amount of the lens group corresponds to the difference between the position on the optical axis at the wide-angle end and the position on the optical axis at the telephoto end. The sign of the movement amount is positive when the lens group is located closer to the image side at the telephoto end than at the wide-angle end. 0.10 <Da / D1<0.60 (5) 0.48<(-f1) / fa_t<1.27 (6) 0.25 <f1 / fm1<0.88 (7) 0.83<(-f1) / fw<1.97 (8) 0.38 <fa_t / ft<1.51 (9) 0.20 <xa_t / TLw<0.56 (10) 0.19 <xb_w / TLw<0.55 (11) 0.09<│ma│ / TLw<0.27 (12) 0.06<│mb│ / TLw<0.20 (13) 0.71 <fm2 / (-fm3)<1.36 (14)

[0045] The technical meaning of each conditional expression will be explained below.

[0046] Conditional formula (5) specifies the ratio of the thickness of the first lens group L1 to the maximum air gap within the first lens group L1. If the upper limit of conditional formula (5) is exceeded, the first lens group L1 becomes too large. As a result, the zoom lens L0 becomes large, which is undesirable. On the other hand, if the lower limit of conditional formula (5) is exceeded, it is undesirable because it is not possible to ensure a sufficient spacing for arranging lenses necessary for satisfactorily correcting various aberrations generated in the first lens group L1.

[0047] Conditional formula (6) is a conditional formula that specifies the ratio between the focal length of the first lens group L1 and the composite focal length of the lenses disposed between the first lens group L1 and the first intermediate lens group Lm1. If the upper limit of conditional formula (6) is exceeded, the power of the lens group disposed between the first lens group L1 and the first intermediate lens group Lm1 becomes too strong. As a result, it becomes difficult to satisfactorily correct various aberrations such as spherical aberration, which is not preferable. On the other hand, if the lower limit of conditional formula (6) is exceeded, the power of the first lens group L1 becomes too strong, which makes it difficult to satisfactorily correct various aberrations such as field curvature, which is not preferable.

[0048] Conditional formula (7) is a conditional formula that specifies the ratio between the focal length of the first lens group L1 and the focal length of the first intermediate lens group Lm1. If the upper limit of conditional formula (7) is exceeded, the power of the first intermediate lens group Lm1 becomes too strong, making it difficult to satisfactorily correct various aberrations such as spherical aberration, which is undesirable. On the other hand, if the lower limit of conditional formula (7) is exceeded, the power of the first intermediate lens group Lm1 becomes too weak, making it difficult to achieve a sufficiently high zoom ratio, which is also undesirable.

[0049] Conditional formula (8) specifies the ratio between the focal length of the first lens group L1 and the focal length of the entire zoom lens L0 at the wide-angle end. If the upper limit of conditional formula (8) is exceeded, the power of the first lens group L1 becomes too weak. As a result, when the angle is increased, the front lens becomes large and the zoom lens L0 becomes large, which is not preferable. On the other hand, if the lower limit of conditional formula (8) is exceeded, the power of the first lens group L1 becomes too strong. As a result, when the angle is increased, it becomes difficult to satisfactorily correct various aberrations occurring in the first lens group L1, which is not preferable.

[0050] Conditional formula (9) is a conditional formula that specifies the ratio between the composite focal length of the lenses disposed between the first lens group L1 and the first intermediate lens group Lm1 and the focal length of the entire system at the telephoto end of the zoom lens L0. If the upper limit of conditional formula (9) is exceeded, the power of the lens group disposed between the first lens group L1 and the first intermediate lens group Lm1 becomes too weak, which increases the amount of movement required for magnification change, which is undesirable. On the other hand, if the lower limit of conditional formula (9) is not reached, the power of the lens group disposed between the first lens group L1 and the first intermediate lens group Lm1 becomes too strong. As a result, it becomes difficult to satisfactorily correct various aberrations such as spherical aberration, which is undesirable.

[0051] Conditional formula (10) specifies the distance on the optical axis at the telephoto end from the vertex of the lens surface of the movable group arranged closer to the object than the first intermediate lens group Lm1 relative to the total lens length to the vertex of the lens surface of the first intermediate lens group Lm1 closest to the object. If the upper limit of conditional formula (10) is exceeded, the movable group arranged closer to the object than the first intermediate lens group Lm1 in order to capture off-axis light at the telephoto end will become large, which is undesirable. On the other hand, if the lower limit of conditional formula (10) is exceeded, a sufficient space cannot be secured to obtain the amount of movement of the movable group required for high zoom ratio, which is undesirable.

[0052] Conditional expression (11) specifies the distance on the optical axis at the wide-angle end from the surface vertex of the lens surface closest to the image of the first intermediate lens group Lm1 to the surface vertex of the lens surface closest to the image of the movable group arranged closer to the image than the first intermediate lens group Lm1 with respect to the total lens length. If the upper limit of conditional expression (11) is exceeded, the movable group arranged closer to the image than the first intermediate lens group Lm1 in order to capture off-axis light at the wide-angle end becomes large, which is undesirable. On the other hand, if the lower limit of conditional expression (11) is exceeded, a sufficient space cannot be secured to obtain the amount of movement of the movable group required for high zoom ratio, which is undesirable.

[0053] Conditional expression (12) specifies the amount of movement of the movable group disposed closer to the object side than the first intermediate lens group Lm1 relative to the overall lens length. If the upper limit of conditional expression (12) is exceeded, the amount of movement becomes too large, which is undesirable. On the other hand, if the lower limit of conditional expression (12) is not satisfied, the amount of movement becomes too small, which makes it difficult to achieve a sufficiently high zoom ratio, which is undesirable.

[0054] Conditional expression (13) specifies the amount of movement of the movable group arranged closer to the image side than the first intermediate lens group Lm1 with respect to the overall lens length. If the upper limit of conditional expression (13) is exceeded, the amount of movement becomes too large, which is undesirable. On the other hand, if the lower limit of conditional expression (13) is not satisfied, the amount of movement becomes too small, which makes it difficult to achieve a sufficiently high zoom ratio, which is undesirable.

[0055] Conditional expression (14) is a conditional expression that specifies the ratio between the focal length of the second intermediate lens group Lm2 and the focal length of the third intermediate lens group Lm3. If the upper limit of conditional expression (14) is exceeded, the power of the third intermediate lens group Lm3 becomes too strong, which is undesirable as it becomes difficult to satisfactorily correct various aberrations such as field curvature. On the other hand, if the lower limit of conditional expression (14) is not reached, the power of the second intermediate lens group Lm2 becomes too strong. As a result, it becomes difficult to satisfactorily correct various aberrations such as spherical aberration at the telephoto end and various aberrations such as field curvature at the wide-angle end, which is undesirable.

[0056] It is more preferable that the numerical ranges of the conditional expressions (5) to (14) be within the ranges of the following conditional expressions (5a) to (14a). 0.15 <Da / D1<0.55 (5a) 0.54<(-f1) / fa_t<1.17 (6a) 0.27 <f1 / fm1<0.82 (7a) 0.94<(-f1) / fw<1.88 (8a) 0.43 <fa_t / ft<1.30 (9a) 0.21 <xa_t / TLw<0.52 (10a) 0.22 <xb_w / TLw<0.51 (11a) 0.11<│ma│ / TLw<0.25 (12a) 0.06<│mb│ / TLw<0.18 (13a) 0.75 <fm2 / (-fm3)<1.30 (14a)

[0057] It is more preferable that the numerical ranges of the conditional expressions (5) to (14) be within the numerical ranges of the following conditional expressions (5b) to (14b). 0.20 <Da / D1<0.50 (5b) 0.57<(-f1) / fa_t<1.08 (6b) 0.28 <f1 / fm1<0.75 (7b) 0.99<(-f1) / fw<1.80 (8b) 0.46 <fa_t / ft<1.25 (9b) 0.22 <xa_t / TLw<0.49 (10b) 0.23 <xb_w / TLw<0.49 (11b) 0.13<│ma│ / TLw<0.24 (12b) 0.07<│mb│ / TLw<0.17 (13b) 0.79 <fm2 / (-fm3)<1.25 (14b)

[0058] Next, the detailed configuration of the zoom lens of each embodiment will be described.

[0059] [Example 1] The zoom lens L0 of the first embodiment is composed of, arranged in order from the object side to the image side, a first lens group L1 with negative refractive power, a second lens group L2 with positive refractive power, an intermediate group LM, and a final lens group LN with positive refractive power. The intermediate group LM is composed of, arranged in order from the object side to the image side, a first intermediate lens group Lm1 with negative refractive power, a second intermediate lens group Lm2 with positive refractive power, and a third intermediate lens group Lm3 with negative refractive power.

[0060] During zooming, the first lens unit L1, the first intermediate lens unit Lm1, and the final lens unit LN are stationary with respect to the image surface IP. During zooming from the wide-angle end to the telephoto end, the second lens unit L2 and the second intermediate lens unit Lm2 move monotonically toward the object side.

[0061] During zooming from the wide-angle end to the intermediate zoom position, the third intermediate lens group Lm3 moves monotonically toward the object side while narrowing the distance between it and the second intermediate lens group Lm2. During zooming from the intermediate zoom position to the telephoto end, the third intermediate lens group Lm3 moves monotonically toward the object side while widening the distance between it and the second intermediate lens group Lm2.

[0062] During focusing from infinity to a close distance, the third intermediate lens unit Lm3 moves toward the image side.

[0063] [Example 2] The zoom lens L0 of the second embodiment has the same configuration as the zoom lens L0 of the first embodiment.

[0064] [Example 3] The zoom lens L0 of the third embodiment has the same configuration as the zoom lens L0 of the first embodiment.

[0065] [Example 4] The zoom lens L0 of the fourth embodiment is composed of a first lens group L1 having negative refractive power, a second lens group L2 having positive refractive power, an intermediate group LM, and a final lens group LN having negative refractive power, which are arranged in that order from the object side to the image side. The intermediate group LM is composed of a first intermediate lens group Lm1 having negative refractive power and a second intermediate lens group Lm2 having positive refractive power, which are arranged in that order from the object side to the image side.

[0066] During zooming, the first lens unit L1, the first intermediate lens unit Lm1, and the final lens unit LN are stationary with respect to the image surface IP. During zooming from the wide-angle end to the telephoto end, the second lens unit L2 and the second intermediate lens unit Lm2 move monotonically toward the object side.

[0067] During focusing from infinity to a close distance, the negative lens arranged closest to the image side in the second intermediate lens unit Lm2 moves toward the image side.

[0068] [Example 5] The zoom lens L0 of the fifth embodiment is composed of, arranged in order from the object side to the image side, a first lens group L1 having negative refractive power, a second lens group L2 having positive refractive power, an intermediate group LM, and a final lens group LN having positive refractive power. The intermediate group LM is composed of, arranged in order from the object side to the image side, a third lens group L3 having positive refractive power, a first intermediate lens group Lm1 having negative refractive power, and a second intermediate lens group Lm2 having positive refractive power.

[0069] During zooming, the first lens unit L1, the first intermediate lens unit Lm1, and the final lens unit LN are stationary with respect to the image surface IP. During zooming from the wide-angle end to the telephoto end, the second lens unit L2 and the second intermediate lens unit Lm2 move monotonically toward the object side.

[0070] During zooming from the wide-angle end to the intermediate zoom position, the third lens group L3 moves monotonically toward the object side while widening the distance between it and the second lens group L2. During zooming from the intermediate zoom position to the telephoto end, the third lens group L3 moves monotonically toward the object side while narrowing the distance between it and the second lens group L2.

[0071] During focusing from infinity to a close distance, the second lens unit L2 moves toward the image side.

[0072] [Example 6] The zoom lens L0 of the sixth embodiment has the same configuration as the zoom lens L0 of the fifth embodiment.

[0073] [Example 7] The zoom lens L0 of the seventh embodiment is composed of, arranged in order from the object side to the image side, a first lens group L1 having negative refractive power, a second lens group L2 having positive refractive power, an intermediate group LM, and a final lens group LN having positive refractive power. The intermediate group LM is composed of, arranged in order from the object side to the image side, a third lens group L3 having positive refractive power, a first intermediate lens group Lm1 having negative refractive power, a second intermediate lens group Lm2 having positive refractive power, and a third intermediate lens group Lm3 having negative refractive power.

[0074] During zooming, the first lens unit L1, the first intermediate lens unit Lm1, and the final lens unit LN are stationary with respect to the image surface IP. During zooming from the wide-angle end to the telephoto end, the second lens unit L2 and the second intermediate lens unit Lm2 move monotonically toward the object side.

[0075] During zooming from the wide-angle end to the intermediate zoom position, the third lens group L3 moves monotonically toward the object side while widening the distance between it and the second lens group L2. During zooming from the intermediate zoom position to the telephoto end, the third lens group L3 moves monotonically toward the object side while narrowing the distance between it and the second lens group L2.

[0076] During zooming from the wide-angle end to the intermediate zoom position, the third intermediate lens group Lm3 moves monotonically toward the object side while narrowing the distance between it and the second intermediate lens group Lm2. During zooming from the intermediate zoom position to the telephoto end, the third intermediate lens group Lm3 moves monotonically toward the object side while widening the distance between it and the second intermediate lens group Lm2.

[0077] During focusing from infinity to a close distance, the third intermediate lens unit Lm3 moves toward the image side.

[0078] [Example 8] The zoom lens L0 of the eighth embodiment has the same configuration as the zoom lens L0 of the first embodiment.

[0079] [Example 9] The zoom lens L0 of the ninth embodiment has the same configuration as the zoom lens L0 of the first embodiment.

[0080] [Example 10] The zoom lens L0 of the tenth embodiment has the same configuration as the zoom lens L0 of the first embodiment.

[0081] [Example 11] The zoom lens L0 of the eleventh embodiment has the same configuration as the zoom lens L0 of the first embodiment.

[0082] [Example 12] The zoom lens L0 of the twelfth embodiment has the same configuration as the zoom lens L0 of the first embodiment.

[0083] [Example 13] The zoom lens L0 of the thirteenth embodiment has the same configuration as the zoom lens L0 of the first embodiment.

[0084] Numerical examples 1 to 13 corresponding to the first to thirteenth embodiments are shown below.

[0085] 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. In addition, nd represents the refractive index of each optical member with respect to the d-line, and νd represents the Abbe number of the optical member. The Abbe number νd of a certain material is a value defined by the following formula, where Nd, NF, NC, and Ng are the refractive indices at the d-line (587.6 nm), F-line (486.1 nm), C-line (656.3 nm), and g-line (wavelength 435.8 nm) of the Fraunhofer lines. νd=(Nd-1) / (NF-NC)

[0086] In each numerical example, the focal length (mm), F-number, and half angle of view (°) are all values ​​when the zoom lens of each example is focused on an object at infinity. The back focus BF is the distance from the final lens surface to the image surface. The total optical length is the sum of the back focus and the distance from the first lens surface to the final lens surface. The lens group is not limited to being composed of multiple lenses, and may be composed of a single lens.

[0087] Furthermore, if the optical surface is aspheric, a * symbol is added to the right of the surface number. The aspheric shape can be expressed by the following formula, where X is the displacement from the apex 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, and A10 are aspheric coefficients of each order. Note that "e±XX" in each aspheric coefficient is expressed as "×10 ±XX " It means. 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

[0088] [Numerical Example 1] Unit: mm Surface Data Surface number rd nd νd 1 55.971 1.50 1.80400 46.5 2 19.923 6.30 3 129.400 1.50 1.72916 54.7 4 45.014 2.92 5 -266.970 1.20 1.49700 81.7 6 61.325 0.15 7 30.898 2.59 1.85478 24.8 8 53.178 (variable) 9 78.476 1.00 1.85478 24.8 10 31.335 3.98 1.59282 68.6 11 -67.036 0.15 12* 40.595 4.06 1.58313 59.4 13* -122.866 (variable) 14(Aperture) ∞ 1.67 15 -181.924 1.00 1.77250 49.6 16 23.537 1.81 2.00069 25.5 17 50.288 3.43 18 -22.199 1.00 1.72916 54.7 19 -27.406 (variable) 20* 27.941 7.79 1.49700 81.7 21* -25.717 0.15 22 46.962 5.59 1.49700 81.7 23 -28.833 1.00 1.85478 24.8 24 -77.823 (variable) 25 36.024 1.00 1.69680 55.5 26 16.940 7.83 27 -18.145 1.50 1.58313 59.4 28* -47.332 (variable) 29 -56.752 5.82 1.48749 70.2 30 -25.524 13.50 Image plane ∞ Aspheric Data Side 12 K=0.00000e+00 A4=-9.02395e-06 A6=-1.00648e-08 A8=-2.55852e-11 A10=-7.53599e-15 Page 13 K=0.00000e+00 A4=-9.91511e-06 A6=-3.22097e-09 Page 20 K=0.00000e+00 A4=-1.79834e-05 A6=-5.28858e-09 A8=-1.27278e-11 Page 21 K=0.00000e+00 A4= 1.06157e-05 A6=-1.36403e-08 Page 28 K=0.00000e+00 A4=-2.90392e-06 A6= 9.12665e-09 A8=1.49351e-10 A10=-8.38576e-13 Various data Zoom ratio 2.35 Wide Angle Mid-Telephoto Focal length 20.60 32.25 48.50 F-number 4.08 4.08 4.12 Half angle of view 42.00 33.44 24.04 Image height 18.55 21.29 21.63 Optical total length 125.00 125.00 125.00 BF 13.50 13.50 13.50 d 8 26.22 15.50 4.78 d13 1.50 12.22 22.95 d19 14.08 8.42 1.50 d24 1.82 1.50 4.55 d28 2.93 8.91 12.78 Zoom lens group data Group starting plane focal length 1 1 -27.81 2 9 33.50 3 14 -49.61 4 20 22.93 5 25 -22.97 6 29 89.67

[0089] [Numerical Example 2] Unit: mm Surface Data Surface number rd nd νd 1 45.250 1.50 1.72916 54.7 2 20.814 6.60 3 84.708 1.50 1.72916 54.7 4 31.938 4.36 5 -259.228 1.20 1.49700 81.7 6 55.425 0.15 7 30.626 2.57 1.85478 24.8 8 49.293 (variable) 9* 49.097 3.43 1.58313 59.4 10 148.017 1.52 11 -59.949 1.00 1.77047 29.7 12 27.768 4.48 1.74400 44.8 13 -90.940 0.15 14* 28.349 5.39 1.58313 59.4 15 -64.670 (variable) 16 (Aperture) ∞ 1.63 17 -201.577 1.00 1.77250 49.6 18 22.220 1.71 2.00069 25.5 19 45.454 3.32 20 -19.997 1.00 1.77250 49.6 21 -23.310 (variable) 22* 32.017 6.90 1.49700 81.7 23* -29.004 0.15 24 63.721 5.49 1.49700 81.7 25 -24.855 1.00 1.85478 24.8 26 -56.137 (variable) 27 53.637 1.00 1.65160 58.5 28 22.229 9.11 29 -18.121 1.00 1.72916 54.7 30 -32.593 (variable) 31 -57.886 3.29 1.90043 37.4 32 -34.604 13.50 Image plane ∞ Aspheric Data 9th page K=0.00000e+00 A4=1.51622e-05 A6=-2.31638e-08 A8=1.08693e-10 A10=-2.67591e-13 Page 14 K=0.00000e+00 A4=-2.07940e-05 A6=1.32622e-08 A8=-1.35712e-10 A10=4.25991e-13 Page 22 K=0.00000e+00 A4=-1.46478e-05 A6=1.17508e-08 A8=-1.06702e-11 Page 23 K=0.00000e+00 A4=3.07952e-06 A6=2.13796e-09 Various data Zoom ratio 2.3 Wide Angle Mid-Telephoto Focal length 20.60 32.36 48.50 F-number 4.08 4.08 4.12 Half angle of view 42.13 33.40 24.04 Image height 18.64 21.34 21.64 Optical total length 127.50 127.50 127.50 BF 13.50 13.50 13.50 d 8 23.35 12.59 1.83 d15 1.50 12.26 23.02 d21 12.86 7.86 1.50 d26 2.74 1.50 4.33 d30 3.07 9.31 12.84 Zoom lens group data Group starting plane focal length 1 1 -28.63 2 9 32.28 3 16 -49.53 4 22 25.60 5 27 -27.30 6 31 89.56

[0090] [Numerical Example 3] Unit: mm Surface Data Surface number rd nd νd 1 44.745 1.50 1.72916 54.7 2 21.886 6.85 3 78.467 1.50 1.72916 54.7 4 32.433 4.48 5 -878.796 1.20 1.49700 81.7 6 48.351 0.15 7 29.472 2.58 1.84666 23.8 8 43.453 (variable) 9 71.856 3.46 1.90043 37.4 10 -65.139 0.75 11 -42.357 1.00 1.85478 24.8 12 77.478 2.93 1.69680 55.5 13 -84.412 0.15 14* 56.676 4.77 1.58313 59.4 15* -59.686 (variable) 16 (Aperture) ∞ 1.62 17 -197.549 1.00 1.77250 49.6 18 21.757 1.63 2.00069 25.5 19 43.574 3.08 20 -21.212 1.00 1.83481 42.7 21 -25.869 (variable) 22* 36.089 6.24 1.49700 81.7 23* -30.061 0.15 24 53.799 5.45 1.49700 81.7 25 -25.813 1.00 1.85478 24.8 26 -47.330 (variable) 27 46.807 1.00 1.62041 60.3 28 21.004 8.66 29 -17.995 1.00 1.65160 58.5 30 -36.676 (variable) 31 -57.878 4.12 1.65160 58.5 32 -30.358 13.50 Image plane ∞ Aspheric Data Page 14 K=0.00000e+00 A 4=-6.66695e-06 A6=2.23155e-09 A8=-4.18577e-11 A10=1.67131e-13 Page 15 K=0.00000e+00 A4=-5.35653e-06 A6=7.22957e-09 Page 22 K=0.00000e+00 A4=-1.59313e-05 A6= 4.71359e-09 A8=7.57612e-12 Page 23 K=0.00000e+00 A4= 1.51739e-06 A6=-7.78004e-09 Various data Zoom ratio 2.35 Wide Angle Mid-Telephoto Focal length 20.60 32.51 48.50 F-number 4.08 4.08 4.12 Half angle of view 42.13 33.29 24.04 Image height 18.64 21.34 21.64 Optical total length 127.50 127.50 127.50 BF 13.50 13.50 13.50 d 8 27.87 16.96 6.05 d15 1.50 12.41 23.32 d21 11.34 6.89 1.50 d26 2.97 1.50 3.87 d30 3.04 8.97 11.99 Zoom lens group data Group starting plane focal length 1 1 -29.98 2 9 32.41 3 16 -44.06 4 22 24.32 5 27 -27.56 6 31 92.53

[0091] [Numerical Example 4] Unit: mm Surface Data Surface number rd nd νd 1 30.582 1.50 1.72916 54.7 2 16.036 4.93 3 73.716 1.50 1.77250 49.6 4 29.329 4.69 5 -59.476 1.20 1.49700 81.7 6 96.505 0.15 7 28.528 2.31 1.73800 32.3 8 64.875 (variable) 9 47.059 4.18 1.56873 63.1 10 -25.918 0.97 11 -18.923 1.00 1.77047 29.7 12 -67.295 0.15 13* 436.420 5.45 1.58313 59.4 14 -19.467 (variable) 15(Aperture) ∞ 1.73 16 -119.997 1.00 1.69680 55.5 17 23.566 1.59 2.00069 25.5 18 44.365 3.19 19 -26.212 1.00 1.61772 49.8 20 -38.635 (variable) 21* 29.301 8.00 1.49700 81.7 22* -22.742 0.15 23 831.741 4.61 1.49700 81.7 24 -24.142 1.00 1.85478 24.8 25 -43.713 1.37 26 594.224 1.00 1.56873 63.1 27 23.152 (variable) 28 -52.988 1.50 1.85150 40.8 29 292.088 0.15 30* 49.699 4.94 1.76450 49.1 31 503.807 14.35 Image plane ∞ Aspheric Data Page 13 K=0.00000e+00 A4=-2.01449e-05 A6=-2.02568e-08 A8=1.05446e-10 A10=-4.88033e-13 Page 21 K=0.00000e+00 A4=-1.85451e-05 A6=2.83729e-08 A8=-8.75848e-11 Page 22 K=0.00000e+00 A4=2.01030e-05 A6=-1.68040e-09 Page 30 K=0.00000e+00 A4=2.29034e-06 A6=-6.38070e-09 A8=7.67247e-12 Various data Zoom ratio 1.96 Wide Angle Mid-Telephoto Focal length 24.72 32.72 48.50 F-number 4.08 4.08 4.12 Half angle of view 37.68 33.00 24.04 Image height 19.09 21.25 21.64 Optical total length 118.16 118.16 118.16 BF 14.35 14.35 14.35 d 8 18.36 10.47 2.58 d14 1.50 9.39 17.28 d20 9.74 9.16 1.50 d27 14.96 15.53 23.19 Zoom lens group data Group starting plane focal length 1 1 -27.30 2 9 28.94 3 15 -43.65 4 21 40.79 5 28 -201.94

[0092] [Numerical Example 5] Unit: mm Surface Data Surface number rd nd νd 1 56.573 1.50 1.72916 54.7 2 25.928 4.82 3 127.534 1.50 1.72916 54.7 4 36.670 4.31 5 -114.076 1.20 1.49700 81.7 6 47.066 0.15 7 32.296 2.52 1.85478 24.8 8 53.393 (variable) 9* 48.857 4.42 1.49700 81.7 10 -51.434 (variable) 11 -24.067 1.00 1.77047 29.7 12 60.475 4.44 1.85150 40.8 13 -36.920 0.15 14* 50.491 6.02 1.58313 59.4 15 -43.687 (variable) 16 (Aperture) ∞ 1.63 17 974.139 1.00 1.85150 40.8 18 19.376 1.88 2.00069 25.5 19 40.712 (variable) 20 41.312 6.11 1.49700 81.7 21 -15.487 1.00 1.80610 33.3 22 -29.411 2.95 23 -24.240 2.28 1.58313 59.4 24* -17.010 6.67 25 -16.347 1.00 1.72916 54.7 26 -85.571 (variable) 27 -1000.000 3.74 1.71700 47.9 28 -55.052 20.30 Image plane ∞ Aspheric Data 9th page K=0.00000e+00 A4=-4.57176e-06 A6=2.13530e-09 A8=-3.07486e-11 A10=8.34198e-14 Page 14 K=0.00000e+00 A4=-5.48417e-06 A6=-4.69605e-09 A8=5.67788e-12 A10=-3.51109e-14 Page 24 K=0.00000e+00 A4=5.80310e-06 A6=2.45746e-08 A8=-4.73642e-11 Various data Zoom ratio 2.35 Wide Angle Mid-Telephoto Focal length 24.72 41.29 58.20 F-number 4.08 4.08 4.12 Half angle of view 38.10 27.52 20.39 Image height 19.39 21.51 21.63 Optical total length 127.50 127.50 127.50 BF 20.30 20.30 20.30 d 8 23.73 7.70 1.00 d10 6.61 11.36 6.77 d15 1.00 12.29 23.58 d19 14.57 6.10 1.23 d26 1.00 9.47 14.34 Zoom lens group data Group starting plane focal length 1 1 -28.00 2 9 51.16 3 11 46.81 4 16 -63.29 5 20 348.73 6 27 81.12

[0093] [Numerical Example 6] Unit: mm Surface Data Surface number rd nd νd 1 56.796 1.50 1.72916 54.7 2 27.536 4.77 3 142.693 1.50 1.72916 54.7 4 38.371 4.39 5 -110.747 1.20 1.49700 81.7 6 41.815 0.15 7 33.190 2.84 1.85478 24.8 8 62.845 (variable) 9* 74.051 3.87 1.49700 81.7 10 -49.579 (variable) 11 -29.430 1.00 1.77047 29.7 12 43.467 4.33 1.85150 40.8 13 -47.752 0.15 14* 38.227 5.42 1.58313 59.4 15 -58.313 (variable) 16 (Aperture) ∞ 1.28 17 -106.596 1.00 1.85150 40.8 18 27.329 1.84 2.00069 25.5 19 87.076 (variable) 20* 31.500 6.32 1.49700 81.7 21 -16.054 1.00 1.80610 33.3 22 -26.499 11.68 23 -12.974 1.00 1.90043 37.4 24 -29.352 (variable) 25 -1000.000 3.95 1.80518 25.4 26 -54.396 17.55 Image plane ∞ Aspheric Data 9th page K=0.00000e+00 A4=-2.07568e-06 A6=3.71698e-09 A8=-6.22940e-11 A10=1.96262e-13 Page 14 K=0.00000e+00 A4=-6.51029e-06 A6=-3.63905e-09 A8=-1.42223e-11 A10=4.62400e-14 Page 20 K=0.00000e+00 A4=1.55170e-05 A6=4.32459e-08 A8=3.53245e-10 Various data Zoom ratio 2.35 Wide Angle Mid-Telephoto Focal length 24.72 40.65 58.20 F-number 4.08 4.08 4.12 Half angle of view 38.11 27.90 20.39 Image height 19.39 21.52 21.63 Optical total length 123.00 123.00 123.00 BF 17.55 17.55 17.55 d 8 23.79 8.06 1.34 d10 6.24 11.00 6.75 d15 1.00 11.97 22.94 d19 14.25 6.85 1.00 d24 1.00 8.40 14.25 Zoom lens group data Group starting plane focal length 1 1 -29.99 2 9 60.38 3 11 46.47 4 16 -71.05 5 20 455.17 6 25 71.31

[0094] [Numerical Example 7] Unit: mm Surface Data Surface number rd nd νd 1 54.338 1.50 1.72916 54.7 2 24.780 5.96 3 89.186 1.50 1.72916 54.7 4 34.953 4.40 5 -686.291 1.20 1.49700 81.7 6 34.043 0.15 7 30.277 2.98 1.85478 24.8 8 50.476 (variable) 9* 67.232 2.12 1.58313 59.4 10 430.017 1.00 11 -98.896 1.00 1.77047 29.7 12 25.513 5.27 1.83481 42.7 13 -125.479 (variable) 14* 29.483 5.16 1.49700 81.7 15 -61.397 (variable) 16 (Aperture) ∞ 1.03 17 -1211.455 1.00 1.80400 46.5 18 21.512 1.84 2.00069 25.5 19 43.075 2.72 20 -26.597 1.00 1.77250 49.6 21 -34.929 (variable) 22* 32.089 5.34 1.49700 81.7 23* -32.017 0.15 24 36.754 5.61 1.49700 81.7 25 -26.999 1.00 1.85478 24.8 26 -53.076 (variable) 27 64.051 1.00 1.72916 54.7 28 19.236 10.20 29 -19.040 1.00 1.72916 54.7 30 -39.959 (variable) 31 -57.820 5.16 1.74400 44.8 32 -28.445 13.50 Image plane ∞ Aspheric Data 9th page K=0.00000e+00 A4=1.57975e-06 A6=-1.49605e-08 A8=9.56357e-11 A10=-3.40589e-13 Page 14 K=0.00000e+00 A4=-1.00522e-05 A6= 2.08652e-09 A8=-5.95610e-11 A10=1.71359e-13 Page 22 K=0.00000e+00 A4=-1.31680e-05 A6=1.67994e-08 A8=-3.81526e-12 Page 23 K=0.00000e+00 A4= 8.24165e-06 A6=1.26404e-08 Various data Zoom ratio 2.83 Wide Angle Mid-Telephoto Focal length 20.60 30.17 58.20 F-number 4.08 4.08 4.12 Half angle of view 42.15 34.80 20.39 Image height 18.65 20.97 21.63 Optical total length 130.00 130.00 130.00 BF 13.50 13.50 13.50 d 8 28.21 14.94 1.74 d13 1.00 5.99 1.00 d15 1.00 9.28 27.46 d21 13.69 9.86 1.00 d26 1.32 1.00 3.04 d30 2.00 6.15 12.96 Zoom lens group data Group starting plane focal length 1 1 -28.76 2 9 115.59 3 14 40.85 4 16 -47.23 5 22 22.32 6 27 -19.69 7 31 70.01

[0095] [Numerical Example 8] Unit: mm Surface Data Surface number rd nd νd 1 41.440 1.50 1.90043 37.4 2 19.957 6.17 3 132.238 1.50 1.80400 46.5 4 32.151 4.69 5 -66.010 1.20 1.49700 81.7 6 71.703 0.15 7 37.710 2.70 1.85478 24.8 8 97.739 (variable) 9* 96.988 3.28 1.58313 59.4 10* -92.129 0.15 11 55.846 3.79 1.59282 68.6 12 -32.452 1.00 1.85478 24.8 13 -50.684 (variable) 14 -60.007 1.00 1.58913 61.1 15 24.460 1.86 1.90366 31.3 16 47.766 2.26 17 (Aperture) ∞ (Variable) 18 22.524 7.67 1.49700 81.7 19 -22.543 1.00 1.90366 31.3 20 -54.292 0.15 21* 42.203 5.41 1.49700 81.7 22* -27.553 (variable) 23 32.781 1.01 1.72916 54.7 24 14.302 9.78 25 -28.558 1.50 1.58313 59.4 26* -114.619 (variable) 27 -56.891 6.06 1.49700 81.7 28 -25.785 13.50 Image plane ∞ Aspheric Data 9th page K=0.00000e+00 A4=-1.18326e-05 A6=-9.52044e-09 A8=-3.43097e-11 Side 10 K=0.00000e+00 A4=-8.46975e-06 A6=-1.36754e-08 Page 21 K=0.00000e+00 A4=-4.73747e-05 A6=-1.09658e-07 A8=4.70777e-11 Page 22 K=0.00000e+00 A4=-4.61456e-06 A6=-6.55507e-08 A8=2.37099e-11 Page 26 K=0.00000e+00 A4=7.89272e-06 A6=-5.60861e-08 A8=1.87916e-10 A10=-1.66382e-12 Various data Zoom ratio 2.35 Wide Angle Mid-Telephoto Focal length 18.54 29.45 43.65 F-number 4.08 4.08 4.12 Half angle of view 45.15 35.89 26.37 Image height 18.63 21.31 21.63 Optical total length 125.00 125.00 125.00 BF 13.50 13.50 13.50 d 8 23.35 13.93 4.50 d13 1.50 10.93 20.35 d17 18.86 9.78 1.50 d22 1.69 1.50 4.42 d26 2.26 11.54 16.89 Zoom lens group data Group starting plane focal length 1 1 -22.28 2 9 32.49 3 14 -63.06 4 18 22.22 5 23 -21.20 6 27 89.13

[0096] [Numerical Example 9] Unit: mm Surface Data Surface number rd nd νd 1 50.596 1.50 1.85150 40.8 2 18.423 6.56 3 149.525 1.50 1.72916 54.7 4 40.636 3.21 5 -140.683 1.20 1.49700 81.7 6 54.204 0.15 7 31.078 2.90 1.85478 24.8 8 68.206 (variable) 9 123.911 1.00 1.85025 30.1 10 22.987 4.68 1.65160 58.5 11 -53.948 0.15 12* 38.255 4.26 1.58313 59.4 13* -93.489 (variable) 14(Aperture) ∞ 1.64 15 -219.206 1.00 1.80400 46.5 16 23.026 1.90 2.00069 25.5 17 54.665 3.45 18 -20.545 1.00 1.80400 46.5 19 -24.118 (variable) 20* 32.852 7.69 1.49700 81.7 21* -26.103 0.15 22 31.150 6.18 1.49700 81.7 23 -38.254 1.00 1.85478 24.8 24 -129.696 (variable) 25 60.987 1.00 1.85150 40.8 26 19.226 6.17 27 -19.696 1.50 1.58313 59.4 28* -36.920 (variable) 29 -56.986 6.21 1.49700 81.7 30 -25.346 13.50 Image plane ∞ Aspheric Data Side 12 K=0.00000e+00 A4=-7.09347e-06 A6=-1.49108e-08 A8=-4.04547e-11 A10=1.53642e-14 Page 13 K=0.00000e+00 A4=-1.01623e-05 A6=-1.40782e-08 Page 20 K=0.00000e+00 A4=-1.31686e-05 A6=-2.60822e-09 A8=1.53174e-12 Page 21 K=0.00000e+00 A4=1.01756e-05 A6=-3.50108e-09 Page 28 K=0.00000e+00 A4=9.50045e-06 A6=2.36563e-08 A8=1.25691e-10 A10=-5.30072e-13 Various data Zoom ratio 2.35 Wide Angle Mid-Telephoto Focal length 18.54 29.00 43.65 F-number 4.08 4.08 4.12 Half angle of view 44.84 36.54 26.37 Image height 18.44 21.49 21.64 Optical total length 125.00 125.00 125.00 BF 13.50 13.50 13.50 d 8 23.70 13.73 3.76 d13 1.50 11.47 21.43 d19 16.04 9.39 1.50 d24 1.90 1.50 4.08 d28 2.37 9.41 14.72 Zoom lens group data Group starting plane focal length 1 1 -24.08 2 9 31.86 3 14 -54.31 4 20 22.13 5 25 -22.08 6 29 86.23

[0097] [Numerical Example 10] Unit: mm Surface Data Surface number rd nd νd 1 58.697 2.00 1.76450 49.1 2* 21.767 3.32 3 38.714 1.50 1.83481 42.7 4 20.959 7.47 5 -64.894 1.20 1.49700 81.5 6 25.687 5.00 1.77047 29.7 7 97.829 (variable) 8 33.056 1.00 1.85478 24.8 9 19.330 3.83 1.51823 58.9 10 -139.181 0.15 11 33.951 2.59 1.52841 76.5 12 -103.323 (variable) 13(Aperture) ∞ 1.90 14 -48.037 2.42 2.00069 25.5 15 -16.386 1.00 1.90043 37.4 16 807.343 2.89 17 -19.763 1.00 1.48749 70.2 18 -21.850 (variable) 19* 29.813 7.00 1.49700 81.5 20* -33.870 0.15 21 41.689 7.00 1.49700 81.5 22 -24.832 0.90 1.85478 24.8 23 -37.687 (variable) 24 42.207 1.00 1.90043 37.4 25 18.378 6.69 26* -15.828 1.50 1.76450 49.1 27* -24.724 (variable) 28 -57.966 4.66 1.49700 81.5 29 -28.192 14.00 Image plane ∞ Aspheric Data 2nd side K=0.00000e+00 A4=-4.34926e-06 A6=-2.33849e-08 A8=4.58313e-11 A10=-1.49569e-13 Page 19 K=0.00000e+00 A4=-1.22772e-05 A6=-3.46073e-09 A8=2.87619e-11 Page 20 K=0.00000e+00 A4=1.92100e-05 A6=-3.82227e-08 A8=4.64430e-11 A10=3.78185e-14 Page 26 K=0.00000e+00 A4=1.29444e-04 A6=-1.08636e-06 A8=3.17187e-09 Page 27 K=0.00000e+00 A4=1.11929e-04 A6=-9.28670e-07 A8=3.51613e-09 A10=-3.25660e-12 Various data Zoom ratio 2.06 Wide Angle Mid-Telephoto Focal length 16.48 24.46 33.95 F-number 4.08 4.08 4.12 Half angle of view 48.64 41.13 32.51 Image height 18.72 21.36 21.64 Optical total length 122.38 122.38 122.38 BF 14.00 14.00 14.00 d 7 22.20 14.45 6.70 d12 1.50 9.25 17.01 d18 14.55 7.59 1.50 d23 1.77 1.43 3.29 d27 2.17 9.47 13.71 Zoom lens group data Group starting plane focal length 1 1 -20.75 2 8 31.31 3 13 -56.76 4 19 21.37 5 24 -22.10 6 28 104.98

[0098] [Numerical Example 11] Unit: mm Surface Data Surface number rd nd νd 1 75.798 2.15 1.76450 49.1 2* 20.955 7.50 3 -148.504 1.20 1.53775 74.7 4 40.273 5.37 5 52.733 2.58 1.77047 29.7 6 247.572 (variable) 7 48.383 1.00 1.85478 24.8 8 21.608 3.53 1.59282 68.6 9 181.976 0.15 10 36.618 2.69 1.83481 42.7 11 -462.575 (variable) 12(Aperture) ∞ 1.99 13 -61.920 2.68 1.80810 22.8 14 -17.654 1.00 1.90043 37.4 15 -782.687 (variable) 16* 40.869 7.00 1.49700 81.5 17* -24.624 0.15 18 29.423 6.48 1.49700 81.5 19 -31.636 0.90 1.85478 24.8 20 -170.020 (variable) 21 29.391 1.00 1.85150 40.8 22 18.203 6.91 23* -14.187 1.50 1.76450 49.1 24* -26.077 (variable) 25 -57.883 2.82 1.90043 37.4 26 -36.703 14.00 Image plane ∞ Aspheric Data 2nd side K=0.00000e+00 A4=-4.42189e-06 A6=-2.03165e-08 A8=3.28080e-11 A10=-1.68898e-13 Page 16 K=0.00000e+00 A4=-3.87009e-06 A6=-1.70155e-08 A8=-1.92942e-10 Page 17 K=0.00000e+00 A4=1.50150e-05 A6=-3.01438e-08 A8=-8.39812e-11 A10=-6.69050e-13 Page 23 K=0.00000e+00 A4=1.92612e-04 A6=-1.47567e-06 A8=4.79928e-09 Page 24 K=0.00000e+00 A4=1.51969e-04 A6=-1.37099e-06 A8=5.56233e-09 A10=-8.39664e-12 Various data Zoom ratio 2.35 Wide Angle Mid-Telephoto Focal length 20.60 32.42 48.50 F-number 4.08 4.08 4.12 Half angle of view 42.98 33.52 24.04 Image height 19.20 21.48 21.63 Optical total length 117.00 117.00 117.00 BF 14.00 14.00 14.00 d 6 22.92 12.21 1.50 d11 1.50 12.21 22.92 d15 14.67 8.09 1.50 d20 2.54 1.43 2.91 d24 2.77 10.46 15.57 Zoom lens group data Group starting plane focal length 1 1 -33.65 2 7 37.80 3 12 -58.15 4 16 23.62 5 21 -23.67 6 25 104.78

[0099] [Numerical Example 12] Unit: mm Surface Data Surface number rd nd νd 1 53.669 2.00 1.76450 49.1 2* 22.183 2.84 3 38.357 1.50 1.90043 37.4 4 18.785 9.89 5 -44.427 1.20 1.49700 81.5 6 49.651 0.15 7 44.261 3.66 1.77047 29.7 8 -230.038 (variable) 9 45.949 1.00 1.80610 33.3 10 19.217 3.47 1.59282 68.6 11 -1161.013 0.15 12 30.492 2.63 1.59282 68.6 13 -236.362 (variable) 14(Aperture) ∞ 1.59 15 -234.100 2.80 1.76182 26.5 16 -19.123 1.00 1.85150 40.8 17 144.749 (variable) 18* 30.612 7.00 1.49700 81.5 19* -26.983 0.15 20 34.872 5.95 1.49700 81.5 21 -28.140 0.90 1.85478 24.8 22 -85.522 (variable) 23 37.240 1.00 1.90043 37.4 24 19.516 5.60 25* -17.122 1.50 1.76450 49.1 26* -30.456 (variable) 27 -85.253 2.94 1.65160 58.5 28 -42.164 14.00 Image plane ∞ Aspheric Data 2nd side K=0.00000e+00 A4=-7.07546e-06 A6=-2.29052e-08 A8=2.47534e-11 A10=-1.17938e-13 Side 18 K=0.00000e+00 A4=-8.44890e-06 A6=-3.82470e-09 A8=-5.75965e-11 Page 19 K=0.00000e+00 A4=1.76346e-05 A6=-3.88394e-08 A8=-9.63881e-12 A10=-8.53919e-14 Page 25 K=0.00000e+00 A4=1.70156e-04 A6=-1.66700e-06 A8=5.33737e-09 Page 26 K=0.00000e+00 A4=1.53337e-04 A6=-1.50071e-06 A8=6.44506e-09 A10=-8.76750e-12 Various data Zoom ratio 2.06 Wide Angle Mid-Telephoto Focal length 16.48 24.29 33.95 F-number 4.08 4.08 4.12 Half angle of view 48.72 40.93 32.51 Image height 18.77 21.06 21.64 Optical total length 115.00 115.00 115.00 BF 14.00 14.00 14.00 d 8 20.80 13.08 5.36 d13 1.50 9.22 16.94 d17 15.35 7.91 1.50 d22 2.10 1.43 3.02 d26 2.31 10.42 15.24 Zoom lens group data Group starting plane focal length 1 1 -22.50 2 9 35.28 3 14 -71.91 4 18 22.64 5 23 -24.10 6 27 124.67

[0100] [Numerical Example 13] Unit: mm Surface Data Surface number rd nd νd 1 55.313 1.50 1.80400 46.5 2 26.509 7.07 3 84.457 1.50 1.72916 54.7 4 31.552 6.21 5 -473.440 1.20 1.59282 68.6 6 58.611 0.15 7 37.921 3.46 1.85478 24.8 8 77.200 (variable) 9 -187.319 1.50 1.80610 33.3 10 38.484 9.00 1.65160 58.5 11 -49.041 2.46 12* 36.407 6.90 1.49700 81.7 13* -125.224 (variable) 14(Aperture) ∞ 2.44 15 -73.514 1.00 1.69680 55.5 16 44.586 2.50 2.00069 25.5 17 339.796 1.69 18 -49.780 1.00 1.61340 44.3 19 -242.601 (variable) 20* 32.454 7.71 1.49700 81.7 21* -28.847 0.15 22 40.658 5.73 1.59282 68.6 23 -36.950 1.00 1.85478 24.8 24 -522.178 (variable) 25 53.509 1.50 1.75500 52.3 26 19.292 8.16 27 -19.910 1.50 1.76450 49.1 28* -28.755 (variable) 29 -56.999 6.04 1.49700 81.7 30 -27.118 13.50 Image plane ∞ Aspheric Data Side 12 K=0.00000e+00 A4=-4.98848e-06 A6=-4.09630e-09 A8=1.35299e-12 A10=-5.99270e-15 Page 13 K=0.00000e+00 A4=-5.36741e-06 A6=1.26727e-09 Page 20 K=0.00000e+00 A4=-1.14938e-05 A6=2.45098e-09 A8=-1.52978e-11 Page 21 K=0.00000e+00 A4=9.02714e-06 A6=-5.81930e-09 Page 28 K=0.00000e+00 A4=3.19122e-06 A6=3.75828e-09 A8=1.37350e-10 A10=-2.86411e-13 Various data Zoom ratio 2.35 Wide Angle Mid-Telephoto Focal length 18.54 29.09 43.65 F-number 2.91 2.91 2.91 Half angle of view 44.84 36.29 26.37 Image height 18.44 21.37 21.64 Optical total length 150.00 150.00 150.00 BF 13.50 13.50 13.50 d 8 33.23 20.02 6.82 d13 1.50 14.70 27.91 d19 14.87 8.49 1.50 d24 2.84 1.72 3.38 d28 2.69 10.19 15.52 Zoom lens group data Group starting plane focal length 1 1 -31.72 2 9 42.58 3 14 -64.35 4 20 24.76 5 25 -27.02 6 29 97.54

[0101] Various values ​​in each numerical example are summarized in Table 1 below.

[0102] [Table 1]

[0103] [Imaging device] Next, an embodiment of a digital still camera (imaging device) using the zoom lens L0 of the present invention as an imaging optical system will be described with reference to Fig. 27. In Fig. 27, 10 denotes a camera body, and 11 denotes an imaging optical system 11 constituted by any of the zoom lenses L0 described in Examples 1 to 13. 12 denotes a solid-state imaging element (photoelectric conversion element) such as a CCD sensor or CMOS sensor that is built into the camera body and receives an optical image formed by the imaging optical system 11 and photoelectrically converts it. The camera body 10 may be a so-called single-lens reflex camera having a quick return mirror, or a so-called mirrorless camera having no quick return mirror.

[0104] In this way, by applying the optical system of the present invention to an imaging device such as a digital still camera, it is possible to obtain an imaging device with a small lens.

[0105] [Imaging system] An imaging system (surveillance camera system) may be configured including the zoom lens L0 of each embodiment and a control unit that controls the zoom lens. In this case, the control unit can control the zoom lens so that each lens group, focusing group, and vibration reduction group move as described above during zooming, focusing, and image blur correction. In this case, the control unit does not need to be configured integrally with the zoom lens, and the control unit may be configured separately from the zoom lens. For example, a configuration may be adopted in which a control unit (control device) disposed far away from a drive unit that drives each lens of the zoom lens includes a transmission unit that sends a control signal (command) for controlling the zoom lens. With such a control unit, the zoom lens can be remotely operated.

[0106] In addition, the control unit may be provided with an operation unit such as a controller or buttons for remotely controlling the zoom lens, so that the zoom lens is controlled in response to a user's input to the operation unit. For example, a zoom-in button and a zoom-out button may be provided as the operation unit. In this case, the control unit may be configured to send a signal to a drive unit for the zoom lens so that the magnification of the zoom lens increases when the user presses the zoom-in button, and decreases when the user presses the zoom-out button.

[0107] The imaging system may also have a display unit such as a liquid crystal panel that displays information (movement state) related to the zoom of the zoom lens. The information related to the zoom of the zoom lens is, for example, the zoom magnification (zoom state) and the movement amount (movement state) of each lens group. In this case, the user can remotely operate the zoom lens via the operation unit while viewing the information related to the zoom of the zoom lens displayed on the display unit. In this case, the display unit and the operation unit may be integrated by adopting, for example, a touch panel.

[0108] Although the preferred embodiments and examples of the present invention have been described above, the present invention is not limited to these embodiments and examples, and various combinations, modifications, and changes are possible within the scope of the gist of the present invention.

[0109] The embodiments of the present invention include the following configurations.

[0110] [Configuration 1] A zoom lens comprising, in order from the object side to the image side, a first lens group having negative refractive power, a second lens group, an intermediate group having one or more lens groups, and a final lens group, in which the distance between adjacent lens groups changes during zooming, the first lens group has two or more lenses; the intermediate lens group includes a first intermediate lens group and a second intermediate lens group arranged adjacent to the first intermediate lens group on the image side, the first lens group and the first intermediate lens group do not move during zooming, Let D1 be the distance on the optical axis from the vertex of the lens surface closest to the object in the first lens group to the vertex of the lens surface closest to the image in the first lens group, TLw be the distance on the optical axis from the vertex of the lens surface closest to the object in the zoom lens to the vertex of the lens surface closest to the image in the zoom lens at the wide-angle end, Skw be the air-equivalent distance on the optical axis from the vertex of the lens surface closest to the image in the zoom lens to the image plane at the wide-angle end, fw be the focal length of the entire system of the zoom lens at the wide-angle end, ft be the focal length of the entire system of the zoom lens at the telephoto end, and νdn be the largest Abbe number among the Abbe numbers of materials of the negative lenses included in the first lens group. 0.04 <D1 / TLw<0.25 0.05 <Skw / fw<1.50 1.65 <ft / fw<6.00 νdn>50 A zoom lens characterized by satisfying the following conditional expressions:

[0111] [Configuration 2] 2. The zoom lens according to configuration 1, wherein the final lens group does not move during zooming.

[0112] [Configuration 3] Let Da be the largest air gap among the air gaps on the optical axis in the first lens group, 0.10 <Da / D1<0.60 3. The zoom lens according to claim 1, wherein the following condition is satisfied:

[0113] [Configuration 4] 4. The zoom lens according to any one of configurations 1 to 3, wherein the first intermediate lens group is a lens group having negative refractive power.

[0114] [Configuration 5] The zoom lens described in any one of configurations 1 to 4, wherein a lens group that is disposed closer to the object side than the first intermediate lens group and moves during zooming moves toward the object side during zooming from the wide-angle end to the telephoto end.

[0115] [Configuration 6] 6. The zoom lens according to any one of configurations 1 to 5, wherein the lens group disposed between the first lens group and the first intermediate lens group is a lens group having positive refractive power.

[0116] [Configuration 7] The zoom lens described in any one of configurations 1 to 6, wherein a lens group that is disposed closer to the image side than the first intermediate lens group and moves during zooming moves toward the object side during zooming from the wide-angle end to the telephoto end.

[0117] [Configuration 8] 8. The zoom lens according to any one of configurations 1 to 7, wherein the second intermediate lens group is a lens group having positive refractive power.

[0118] [Configuration 9] 9. The zoom lens according to any one of configurations 1 to 8, wherein the second intermediate lens group has a lens including an aspheric lens surface.

[0119] [Configuration 10] 10. The zoom lens according to any one of configurations 1 to 9, wherein the first intermediate lens group has an aperture stop.

[0120] [Configuration 11] 11. The zoom lens according to any one of configurations 1 to 10, wherein a lens group having a negative refractive power is disposed closer to the image side than the first intermediate lens group.

[0121] [Configuration 12] 12. The zoom lens according to any one of configurations 1 to 11, wherein the lens in the first lens group that is arranged closest to the image side is a positive lens.

[0122] [Configuration 13] 13. The zoom lens according to any one of configurations 1 to 12, wherein the lens in the first lens group that is disposed closest to the object side is a negative lens.

[0123] [Configuration 14] 14. The zoom lens according to any one of configurations 1 to 13, wherein the lens in the first lens group that is arranged closest to the object side is a lens having a convex surface facing the object side.

[0124] [Configuration 15] When the focal length of the first lens group is f1 and the composite focal length of the lens disposed between the first lens group and the first intermediate lens group at the telephoto end is fa_t, 0.48<(-f1) / fa_t<1.27 15. The zoom lens according to any one of the configurations 1 to 14, wherein the following condition is satisfied:

[0125] [Configuration 16] When the focal length of the first lens group is f1 and the focal length of the first intermediate lens group is fm1, 0.25 <f1 / fm1<0.88 16. The zoom lens according to any one of configurations 1 to 15, wherein the following conditional expression is satisfied:

[0126] [Configuration 17] When the focal length of the first lens group is f1, 0.83<(-f1) / fw<1.97 17. The zoom lens according to any one of configurations 1 to 16, wherein the following condition is satisfied:

[0127] [Configuration 18] When a composite focal length of the lens disposed between the first lens group and the first intermediate lens group at a telephoto end is fa_t, 0.38 <fa_t / ft<1.51 18. The zoom lens according to any one of configurations 1 to 17, wherein the following condition is satisfied:

[0128] [Configuration 19] Let xa_t be the distance on the optical axis at the telephoto end from the surface vertex of the lens surface closest to the object among the lenses disposed between the first lens group and the first intermediate lens group to the surface vertex of the lens surface closest to the object of the first intermediate lens group. 0.20 <xa_t / TLw<0.56 19. The zoom lens according to any one of configurations 1 to 18, wherein the following conditional expression is satisfied:

[0129] [Configuration 20] When the distance on the optical axis at the wide-angle end from the surface vertex of the lens surface closest to the image side in the first intermediate lens group to the surface vertex of the lens surface closest to the image side among the lenses disposed between the first intermediate lens group and the final lens group is denoted by xb_wt, 0.19 <xb_w / TLw<0.55 20. The zoom lens according to any one of configurations 1 to 19, wherein the following condition is satisfied:

[0130] [Configuration 21] Let ma be the maximum movement amount of the lens group disposed between the first lens group and the first intermediate lens group during zooming from the wide-angle end to the telephoto end, 0.09<│ma│ / TLw<0.27 21. The zoom lens according to any one of configurations 1 to 20, which satisfies the following conditional expression:

[0131] [Configuration 22] Let mb be the maximum movement amount of the lens group disposed between the first intermediate lens group and the final lens group during zooming from the wide-angle end to the telephoto end. 0.06<│mb│ / TLw<0.20 22. The zoom lens according to any one of the configurations 1 to 21, wherein the following condition is satisfied:

[0132] [Configuration 23] 23. The zoom lens according to any one of configurations 1 to 22, wherein a third intermediate lens group having negative refractive power is disposed adjacent to the image side of the second intermediate lens group.

[0133] [Configuration 24] When the focal length of the second intermediate lens group is fm2 and the focal length of the third intermediate lens group is fm3, 0.71 <fm2 / (-fm3)<1.36 24. The zoom lens according to claim 23, wherein the following condition is satisfied:

[0134] [Configuration 25] 25. The zoom lens according to any one of configurations 1 to 24, wherein among the lens groups constituting the zoom lens, all of the lens groups that move during zooming are moved by an actuator.

[0135] [Configuration 26] An imaging device comprising the zoom lens according to any one of configurations 1 to 25.

[0136] [Configuration 27] 27. The imaging apparatus according to configuration 26, further comprising an imaging element for photoelectrically converting an optical image formed by the zoom lens. [Explanation of symbols]

[0137] L0 Zoom Lens L1 First lens group L2 Second lens group LM Intermediate lens group Lm1 First intermediate lens group Lm2 Second intermediate lens group LN final lens group

Claims

1. A zoom lens comprising, in order from an object side to an image side, a first lens group having negative refractive power, a second lens group, an intermediate group having one or more lens groups, and a final lens group, in which the distance between adjacent lens groups changes during zooming, the first lens group includes two or more lenses; the intermediate lens group includes a first intermediate lens group and a second intermediate lens group arranged adjacent to the first intermediate lens group on the image side, the first lens group and the first intermediate lens group do not move during zooming, Let D1 be the distance on the optical axis from the surface vertex of the lens surface closest to the object in the first lens group to the surface vertex of the lens surface closest to the image in the first lens group, TLw be the distance on the optical axis from the surface vertex of the lens surface closest to the object in the zoom lens to the surface vertex of the lens surface closest to the image in the zoom lens at the wide-angle end, Skw be the air-equivalent distance on the optical axis from the surface vertex of the lens surface closest to the image in the zoom lens to the image plane at the wide-angle end, fw be the focal length of the entire system at the wide-angle end of the zoom lens, ft be the focal length of the entire system at the telephoto end of the zoom lens, and νdn be the largest Abbe number among the Abbe numbers of materials of the negative lenses included in the first lens group. 0.04<D1 / TLw<0.25 0.05<Skw / fw<1.50 1.65<ft / fw<6.00 νdn>50 A zoom lens characterized by satisfying the following conditional expressions:

2. 2. The zoom lens according to claim 1, wherein the final lens unit does not move during zooming.

3. Let Da be the largest air gap among the air gaps on the optical axis in the first lens group, 0.10<Da / D1<0.60 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

4. 2. The zoom lens according to claim 1, wherein the first intermediate lens group is a lens group having a negative refractive power.

5. 2. The zoom lens according to claim 1, wherein the lens group that is disposed closer to the object side than the first intermediate lens group and that moves during zooming moves toward the object side during zooming from the wide-angle end to the telephoto end.

6. 2. The zoom lens according to claim 1, wherein the lens group disposed between the first lens group and the first intermediate lens group has a positive refractive power.

7. 2. The zoom lens according to claim 1, wherein the lens group that is disposed closer to the image side than the first intermediate lens group and that moves during zooming moves toward the object side during zooming from the wide-angle end to the telephoto end.

8. 2. The zoom lens according to claim 1, wherein the second intermediate lens group is a lens group having a positive refractive power.

9. 2. The zoom lens according to claim 1, wherein the second intermediate lens group has a lens including an aspheric lens surface.

10. 2. The zoom lens according to claim 1, wherein the first intermediate lens group has an aperture stop.

11. 2. The zoom lens according to claim 1, further comprising a lens group having a negative refractive power disposed closer to the image side than the first intermediate lens group.

12. 2. The zoom lens according to claim 1, wherein the lens in the first lens group arranged closest to the image side is a positive lens.

13. 2. The zoom lens according to claim 1, wherein the lens in the first lens group arranged closest to the object side is a negative lens.

14. 2. The zoom lens according to claim 1, wherein the lens in the first lens group arranged closest to the object side is a lens having a convex surface facing the object side.

15. When the focal length of the first lens group is f1 and the composite focal length of the lens disposed between the first lens group and the first intermediate lens group at the telephoto end is fa_t, 0.48<(-f1) / fa_t<1.27 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

16. When the focal length of the first lens group is f1 and the focal length of the first intermediate lens group is fm1, 0.25<f1 / fm1<0.88 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

17. When the focal length of the first lens group is f1, 0.83<(-f1) / fw<1.97 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

18. When a composite focal length at a telephoto end of the lens disposed between the first lens group and the first intermediate lens group is fa_t, 0.38<fa_t / ft<1.51 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

19. Let xa_t be the distance on the optical axis at the telephoto end from the surface vertex of the lens surface closest to the object among the lenses disposed between the first lens group and the first intermediate lens group to the surface vertex of the lens surface closest to the object of the first intermediate lens group. 0.20<xa_t / TLw<0.56 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

20. When the distance on the optical axis at the wide-angle end from the surface vertex of the lens surface closest to the image side in the first intermediate lens group to the surface vertex of the lens surface closest to the image side among the lenses disposed between the first intermediate lens group and the final lens group is denoted by xb_wt, 0.19<xb_w / TLw<0.55 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

21. Let ma be the maximum movement amount of the lens group disposed between the first lens group and the first intermediate lens group during zooming from the wide-angle end to the telephoto end. 0.09<|ma| / TLw<0.27 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

22. Let m b be the maximum movement amount of the lens group disposed between the first intermediate lens group and the final lens group during zooming from the wide-angle end to the telephoto end. 0.06<|mb| / TLw<0.20 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

23. 2. The zoom lens according to claim 1, wherein a third intermediate lens group having a negative refractive power is disposed adjacent to the image side of the second intermediate lens group.

24. When the focal length of the second intermediate lens group is fm2 and the focal length of the third intermediate lens group is fm3, 0.71<fm2 / (-fm3)<1.36 24. The zoom lens according to claim 23, wherein the following condition is satisfied:

25. 2. The zoom lens according to claim 1, wherein all of the lens groups constituting the zoom lens that move during zooming are moved by an actuator.

26. 26. The zoom lens according to claim 3, wherein the final lens group does not move during zooming.

27. Let Da be the largest air gap among the air gaps on the optical axis in the first lens group, 0.10<Da / D1<0.60 26. The zoom lens according to claim 4, wherein the following condition is satisfied:

28. 28. The zoom lens according to claim 27, wherein the final lens unit does not move during zooming.

29. An imaging device comprising the zoom lens according to any one of claims 1 to 25.

30. 30. The imaging apparatus according to claim 29, further comprising an image sensor for photoelectrically converting an optical image formed by the zoom lens.

Images