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 can be provided with an electric zoom function and an image shake correction function.SOLUTION: A zoom lens L0 consists of a negative first lens group L1, a second lens group L2, and a subsequent group LR including one or more lens groups, which are arranged in order from an object side to an image side, in which the interval between the adjacent lens groups changes in zooming. The first lens group L1 has two or more lenses. The subsequent group LR includes an intermediate lens group Lm, and a first image side lens group Lr1 arranged adjacent to an image side of the intermediate lens group Lm. The intermediate lens group Lm has a vibration-proofing group movable in a direction having a component in a vertical direction relative to an optical axis in image shake correction. The first lens group L1 and the intermediate lens group Lm are immobilized in zooming. The distance from a surface apex of a lens surface on the most object side of the first lens group L1 to a surface apex of a lens surface on the most image side of the first lens group L1, the focal distance of the first lens group L1 and the like are 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.

[0002] In particular, the present invention relates to a zoom lens that combines optical vibration reduction with high vibration reduction performance while reducing the size and weight of the movable group used when varying magnification, making it highly suitable for applications such as video shooting. [Background technology]

[0003] In recent years, since zoom lenses are suitable for video shooting and the like, there has been a demand for zoom lenses equipped with a function of electric zoom and image blur correction during shooting.

[0004] Patent Document 1 discloses a negative-lead type zoom lens that achieves both a high zoom ratio and high optical performance by moving each group including the first lens group and an image blur correction mechanism during zooming. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-196449 Summary of the Invention [Problem to be solved by the invention]

[0006] 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. The zoom lens of Patent Document 1 moves heavy lens groups such as the first lens group and the group including the image blur correction mechanism during zooming. Moving heavy lens groups may cause lens tilt, resulting in a deterioration in optical performance.

[0007] 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 and an image blur correction function. [Means for solving the problem]

[0008] A zoom lens of the present invention is a zoom lens which comprises, in order from the object side to the image side, a first lens group having negative refractive power, a second lens group, and a subsequent group including one or more lens groups, and in which the distance between adjacent lens groups changes during zooming, the first lens group has two or more lenses, the subsequent group includes an intermediate lens group and a first image side lens group arranged adjacent to the image side of the intermediate lens group, the intermediate lens group has an image stabilization group which is movable in a direction having a component perpendicular to the optical axis during image blur correction, the first lens group and the intermediate lens group are stationary during zooming, and when the distance on the optical axis from the surface vertex of the lens surface closest to the object of the first lens group to the surface vertex of the lens surface closest to the image of the first lens group is D1, the distance on the optical axis at the wide-angle end from the surface vertex of the lens surface closest to the object of the zoom lens to the surface vertex of the lens surface closest to the image of the zoom lens is TLw, the focal length of the first lens group is f1, and the focal length of the image stabilization group is fis, 0.04 <D1 / TLw<0.30 0.05<│f1 / fis│<1.50 The present invention is characterized in that the following conditional expression is satisfied: Effect of the Invention

[0009] According to the present invention, a zoom lens having a high zoom ratio and high optical performance and capable of being equipped with an electric zoom function and an image blur correction function is provided. [Brief description of the drawings]

[0010] [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 according to 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 according to 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 according to 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 Example 7 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]FIG. 1 is a schematic diagram of an imaging device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] 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.

[0012] 1, 3, 5, 7, 9, 11, 13 and 15 are cross-sectional views of the zoom lenses of Examples 1 to 8, 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 group may be configured with one lens or multiple lenses. Also, the lenses in this embodiment do not include those that have no substantial refractive power, such as prisms.

[0013] In each figure, Li is the i-th (i is a natural number) lens group counted from the object side among the lens groups included in the zoom lens L0. Lm is an intermediate lens group, and has an image stabilization group that can move in a direction having a component perpendicular to the optical axis when correcting image blur. LR is a subsequent group having one or more lens groups, and Lri is the i-th (i is a natural number) lens group counted from the object side among the lens groups arranged on the image side of the intermediate lens group Lm.

[0014] The zoom lens L0 in each embodiment is composed of, in order from the object side to the image side, a negative first lens group L1, a second lens group L2, and a subsequent group LR having one or more lens groups. The subsequent group LR includes an intermediate lens group Lm with negative refractive power, and a first image-side lens group Lr1 with positive refractive power arranged on the image side of the intermediate lens group Lm.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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 below the lens groups that move during focusing.

[0019] 2, 4, 6, 8, 10, 12, 14 and 16 are aberration diagrams of the zoom lenses of Examples 1 to 8 when focused on an object at infinity at the wide-angle end, respectively.

[0020] 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.

[0021] Next, the characteristic configuration of the zoom lens L0 of each embodiment will be described.

[0022] In the zoom lens L0 of each embodiment, the first lens group L1 does not move relative to the image plane IP during zooming. The lenses included in the first lens group L1 have a large outer diameter, and therefore tend to be heavy. Therefore, by keeping the first lens group L1 immobile during zooming, it is possible to achieve fast and quiet zooming. Furthermore, it is possible to suppress the tilt of the first lens group L1 that occurs during zooming.

[0023] In the zoom lens L0 of each embodiment, the intermediate lens group Lm does not move relative to the image surface IP during zooming. Also, during zooming from the wide-angle end to the telephoto end, the second lens group L2 and the first image side lens group Lr1 move toward the object side. The second lens group L2 and the first image side lens group Lr1, which have positive refractive power, are moved toward the object side so as to approach each other relative to the first lens group L1 and the intermediate lens group Lm, which have negative refractive power, respectively, thereby achieving a variable magnification function. Also, by arranging the intermediate lens group Lm, which does not move during zooming, the amount of movement of the second lens group L2 and the first image side lens group Lr1 can be reduced when increasing the variable magnification.

[0024] Here, the amount of movement of the lens group corresponds to the difference between its axial position at the wide-angle end and its axial position at the telephoto end, and the sign of the amount of movement is positive when the lens group is located closer to the image side at the telephoto end than at the wide-angle end.

[0025] Next, the conditions that the zoom lens L0 of each embodiment satisfies will be described.

[0026] The distance on the optical axis from the vertex of the lens surface closest to the object in the first lens group L1 to the 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 vertex of the lens surface closest to the object in the zoom lens L0 to the vertex of the lens surface closest to the image in the zoom lens L0 at the wide-angle end is defined as TLw. When the focal length of the first lens group L1 is f1 and the focal length of the image-stabilizing group IS is fis, the zoom lens L0 in each embodiment satisfies the following conditional expressions (1) and (2). 0.04 <D1 / TLw<0.30 (1) 0.05<│f1 / fis│<1.50 (2)

[0027] 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 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. 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 to correct aberrations occurring in the first lens group L1 or the overall length of the zoom lens L0 becomes too large.

[0028] Conditional formula (2) is a conditional formula that specifies the ratio of the focal length of the first lens group L1 to the focal length of the vibration-reduction group IS. If the upper limit of conditional formula (2) is exceeded, the power of the vibration-reduction group IS becomes too strong, which makes it difficult to satisfactorily correct various aberrations such as decentering coma aberration during image blur correction, which is not preferable. Or, the power of the first lens group L1 becomes too weak, which makes the zoom lens L0 large. As a result, the amount of movement of the movable group during zooming increases, which is not preferable. If the lower limit of conditional formula (2) is exceeded, the power of the vibration-reduction group IS becomes too weak. As a result, the amount of movement required for image blur correction increases, which makes the image blur correction mechanism large, which is not preferable. Or, the power of the first lens group L1 becomes too strong, which makes it difficult to satisfactorily correct off-axis aberrations such as field curvature, which is not preferable.

[0029] It is more preferable that the numerical ranges of the conditional expressions (1) and (2) be the numerical ranges of the following conditional expressions (1a) and (2a). 0.08 <D1 / TLw<0.26 (1a) 0.08<│f1 / fis│<1.00 (2a)

[0030] It is further preferable that the numerical ranges of the conditional expressions (1a) and (2a) be set to the numerical ranges of the following conditional expressions (1b) and (2b). 0.10 <D1 / TLw<0.23 (1b) 0.10<│f1 / fis│<0.80 (2b)

[0031] Next, conditions that the zoom lens L0 of each embodiment should preferably satisfy will be described.

[0032] In the zoom lens L0 of each embodiment, the intermediate lens group Lm includes an aperture stop SP. This configuration allows the movable groups, such as the second lens group L2 and the first image side lens group Lr1, located near the aperture stop SP, to be made smaller and lighter. As a result, good optical performance is achieved over the entire zoom range with high zoom ratio while reducing the load on the actuator that electrically moves the lens groups during zooming. In order to suppress zoom fluctuations such as spherical aberration and curvature of field, it is preferable that the lens group that moves toward the object side during zooming from the wide-angle end to the telephoto end is located on the image side of the second lens group L2 or the image side of the first image side lens group Lr1.

[0033] In the zoom lens L0 of each embodiment, the intermediate lens group Lm includes an anti-vibration group IS with negative refractive power. By mounting a heavy image blur compensation mechanism on the fixed group, it is possible to mount an image blur compensation function while suppressing the load on the actuator that moves the movable group. In addition, by arranging the aperture stop SP adjacent to the anti-vibration group IS, it is possible to reduce the outer diameter of the anti-vibration group IS. As a result, it is possible to reduce the size and weight of the anti-vibration group IS. In addition, the anti-vibration group IS has at least one positive lens and one negative lens. With this configuration, it is possible to suppress fluctuations in chromatic aberration during image blur compensation.

[0034] In the zoom lens L0 of each embodiment, it is preferable that the first lens group L1 has two or more lenses including one negative lens and at least one positive lens. With such a configuration, various aberrations can be corrected well. In addition, by correcting various aberrations such as chromatic aberration and field curvature occurring in the first lens group L1 that does not move during zooming well, it is possible to reduce the number of lenses required to obtain good optical performance in the second lens group L2 and the first image side lens group Lr1. In order to correct chromatic aberration well in the zoom lens L0, it is more preferable that a positive lens is arranged on the most image side of the first lens group L1. In addition, in order to correct off-axis aberrations well at the wide-angle end, it is preferable that the lens arranged on the most image side of the first lens group L1 is a negative meniscus lens with a convex surface facing the object side.

[0035] In the zoom lens L0 of each embodiment, the first image side lens unit Lr1 has a lens including an aspheric lens surface, which makes it possible to effectively correct off-axis aberrations occurring at the wide-angle end while reducing the overall length of the zoom lens L0.

[0036] It is preferable that the zoom lens L0 of each embodiment satisfy one or more of the following conditional expressions (3) to (10).

[0037] Here, the lateral magnification of the vibration-proof group IS at the telephoto end is βist, and the lateral magnification of the optical system consisting of all the lenses arranged on the image side of the vibration-proof group IS at the telephoto end is βisrt. The composite focal length of the lens group arranged between the first lens group L1 and the intermediate lens group Lm at the telephoto end is fat, and the air-equivalent distance on the optical axis at the wide-angle end from the surface vertex of the lens surface closest to the image side of the zoom lens L0 to the image plane is Skw. The total system focal length of the zoom lens L0 at the wide-angle end is fw, the focal length of the intermediate lens group is fm, and the focal length of the total system of the zoom lens L0 at the telephoto end is ft. The largest movement amount of the lens group arranged between the first lens group L1 and the intermediate lens group Lm during zooming from the wide-angle end to the telephoto end is ma. The largest movement amount of the lens group arranged on the image side of the intermediate lens group Lm during zooming from the wide-angle end to the telephoto end is mb. -1.54<(1-βist)×βisrt<-0.61 (3) 0.30 <fat / (-fis)<0.75 (4) 0.05 <Skw / fw<1.85 (5) 0.27 <f1 / fm<0.94 (6) 0.83<(-f1) / fw<1.68 (7) 0.38 <fat / ft<1.34 (8) 0.09<│ma│ / TLw<0.28 (9) 0.06<│mb│ / TLw<0.22 (10)

[0038] The technical meaning of each conditional expression will be explained below.

[0039] Conditional formula (3) defines the image shift sensitivity TS of the image stabilization group IS at the telephoto end, where the image shift sensitivity TS is the ratio (TS=ΔI / ΔL) of the amount of vertical movement ΔL of the image stabilization group IS when the image stabilization group IS is moved in a direction perpendicular to the optical axis to the amount of movement ΔI of the image (imaging position) on the image plane in a direction perpendicular to the optical axis.

[0040] If the upper limit of conditional expression (3) is exceeded, the image shift sensitivity TS of the vibration reduction group IS becomes too low, and the amount of movement required for image blur compensation increases. As a result, the image blur compensation mechanism becomes large, which is not preferable. On the other hand, if the lower limit of conditional expression (3) is exceeded, the power of the vibration reduction group IS becomes too strong. As a result, it is not preferable because it becomes difficult to satisfactorily correct various aberrations such as decentering coma aberration that occur during image blur compensation.

[0041] Conditional formula (4) is a conditional formula that specifies the ratio between the composite focal length at the telephoto end of the lens disposed between the first lens group L1 and the intermediate lens group Lm and the focal length of the vibration-reduction group IS. If the upper limit value of conditional formula (4) is exceeded, the power of the vibration-reduction group IS becomes too strong. As a result, it is difficult to satisfactorily correct various aberrations such as decentering coma aberration that occur during image blur correction, which is not preferable. Or, the power of the lens group disposed between the first lens group L1 and the intermediate lens group Lm becomes too weak. As a result, the amount of movement required for magnification increases, which is not preferable.

[0042] On the other hand, if the lower limit of conditional formula (4) is exceeded, the power of the image stabilization group IS becomes too weak, which increases the amount of movement required for image blur correction, which is not preferable, or the power of the lens group disposed between the first lens group L1 and the intermediate lens group Lm becomes too strong, which makes it difficult to satisfactorily correct various aberrations such as spherical aberration, which is also not preferable.

[0043] Conditional formula (5) is a conditional formula that specifies 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 (5) is exceeded, the total optical length will increase, and the entire zoom lens L0 will become larger, which is undesirable. On the other hand, if the lower limit of conditional formula (5) is exceeded, the flange back cannot be sufficiently secured, making it difficult to arrange the shutter member, etc., which is also undesirable.

[0044] Conditional formula (6) defines the ratio between the focal length of the first lens group L1 and the focal length of the middle lens group Lm. If the upper limit of conditional formula (6) is exceeded, the power of the middle lens group Lm becomes too strong, making it difficult to effectively correct various aberrations such as spherical aberration, which is undesirable. On the other hand, if the lower limit of conditional formula (6) is exceeded, the power of the middle lens group Lm becomes too weak, making it difficult to achieve a sufficiently high zoom ratio, which is undesirable.

[0045] Conditional formula (7) specifies the ratio between the focal length of the first lens group L1 and the focal length of the entire system at the wide-angle end of the zoom lens L0. If the upper limit of conditional formula (7) is exceeded, the power of the first lens group L1 becomes too weak. As a result, the front lens becomes large when the angle is increased, which is not preferable. On the other hand, if the lower limit of conditional formula (7) is exceeded, the power of the first lens group L1 becomes too strong. As a result, it is difficult to satisfactorily correct various aberrations such as field curvature that occur in the first lens group L1 when the angle is increased, which is not preferable.

[0046] Conditional formula (8) is a conditional formula that specifies the ratio between the composite focal length of the lens disposed between the first lens group L1 and the intermediate lens group Lm at the telephoto end and the total focal length of the zoom lens L0 at the telephoto end. If the upper limit of conditional formula (8) is exceeded, the power of the lens group disposed between the first lens group L1 and the intermediate lens group Lm becomes too weak. As a result, the amount of movement required for magnification increases, which is not preferable. On the other hand, if the lower limit of conditional formula (8) is exceeded, the power of the lens group disposed between the first lens group L1 and the intermediate lens group Lm becomes too strong. As a result, it is not preferable because it is difficult to satisfactorily correct various aberrations such as spherical aberration.

[0047] Conditional formula (9) specifies the amount of movement of the movable group arranged closer to the object side than the intermediate lens group Lm with respect to the overall lens length. If the upper limit of conditional formula (9) is exceeded, the amount of movement becomes too large, which is undesirable, as the actuator mechanism becomes larger. On the other hand, if the lower limit of conditional formula (9) is exceeded, the amount of movement becomes too small, which makes it difficult to achieve a sufficiently high zoom ratio, which is undesirable.

[0048] Conditional formula (10) specifies the amount of movement of the movable group arranged closer to the image side than the intermediate lens group Lm with respect to the overall lens length. If the upper limit of conditional formula (10) is exceeded, the amount of movement becomes too large, which is undesirable, as the actuator mechanism becomes larger. On the other hand, if the lower limit of conditional formula (10) is exceeded, the amount of movement becomes too small, which makes it difficult to achieve a sufficiently high zoom ratio, which is undesirable.

[0049] It is more preferable that the numerical ranges of the conditional expressions (3) to (10) be within the ranges of the following conditional expressions (3a) to (10a). -1.38<(1-βist)×βisrt<-0.69 (3a) 0.33 <fat / (-fis)<0.67 (4a) 0.20 <Skw / fw<1.70 (5a) 0.29 <f1 / fm<0.86 (6a) 0.95<(-f1) / fw<1.54 (7a) 0.43 <fat / ft<1.20 (8a) 0.11<│ma│ / TLw<0.25 (9a) 0.06<│mb│ / TLw<0.20 (10a)

[0050] It is more preferable that the numerical ranges of the conditional expressions (3) to (10) be within the numerical ranges of the following conditional expressions (3b) to (10b). -1.28<(1-βist)×βisrt<-0.73 (3b) 0.35 <fat / (-fis)<0.62 (4b) 0.30 <Skw / fw<1.63 (5b) 0.31 <f1 / fm<0.79 (6b) 1.07<(-f1) / fw<1.47 (7b) 0.48 <fat / ft<1.11 (8b) 0.13<│ma│ / TLw<0.24 (9b) 0.07<│mb│ / TLw<0.19 (10b)

[0051] Next, the detailed configuration of the zoom lens L0 in each embodiment will be described.

[0052] [Example 1] The zoom lens L0 of the first embodiment is composed of a first lens group L1 with negative refractive power, a second lens group L2 with positive refractive power, and a rear group LR, which are arranged in this order from the object side to the image side. The rear group LR is composed of an intermediate lens group Lm with negative refractive power, a first image side lens group Lr1 with positive refractive power, a second image side lens group Lr2 with negative refractive power, and a third image side lens group Lr3 with positive refractive power. The intermediate lens group Lm is composed of an aperture stop SP, a first intermediate sub group Lma with negative refractive power that is movable in a direction having a component perpendicular to the optical axis during image blur correction, and a second intermediate sub group Lmb with negative refractive power that is stationary during image blur correction, which are arranged in this order from the object side.

[0053] During zooming, the first lens unit L1, the intermediate lens unit Lm, and the third image side lens unit Lr3 do not move 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 first image side lens unit Lr1 move monotonically toward the object side.

[0054] During zooming from the wide-angle end to the intermediate zoom position, the second image side lens unit Lr2 moves monotonically toward the object side while narrowing the distance between it and the first image side lens unit Lr1. Furthermore, during zooming from the intermediate zoom position to the telephoto end, the second image side lens unit Lr2 moves monotonically toward the object side while widening the distance between it and the first image side lens unit Lr1.

[0055] During focusing from infinity to a close distance, the second image side lens unit Lr2 moves toward the image side.

[0056] [Example 2] The zoom lens L0 of the second embodiment is composed of a first lens group L1 with negative refractive power, a second lens group L2 with positive refractive power, and a rear group LR, which are arranged in this order from the object side to the image side. The rear group LR is composed of a third lens group L3 with positive refractive power, an intermediate lens group Lm with negative refractive power, a first image side lens group Lr1 with positive refractive power, a second image side lens group Lr2 with negative refractive power, and a third image side lens group Lr3 with positive refractive power. The intermediate lens group Lm has the same configuration as the intermediate lens group Lm in the first embodiment.

[0057] During zooming, the first lens unit L1, the intermediate lens unit Lm, and the third image side lens unit Lr3 do not move 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 first image side lens unit Lr1 move monotonically toward the object side.

[0058] 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, and 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.

[0059] During zooming from the wide-angle end to the intermediate zoom position, the second image side lens unit Lr2 moves monotonically toward the object side while narrowing the distance between it and the first image side lens unit Lr1. Furthermore, during zooming from the intermediate zoom position to the telephoto end, the second image side lens unit Lr2 moves monotonically toward the object side while widening the distance between it and the first image side lens unit Lr1.

[0060] During focusing from infinity to a close distance, the second image side lens unit Lr2 moves toward the image side.

[0061] [Example 3] The zoom lens L0 of Example 3 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, and a rear group LR. The rear group LR has the same configuration as the rear group LR in Example 1. The intermediate lens group Lm is composed of, arranged in order from the object side, a first intermediate subgroup Lma with negative refractive power that is movable in a direction having a component perpendicular to the optical axis during image blur correction, and an aperture stop SP.

[0062] During zooming, the first lens unit L1, the intermediate lens unit Lm, and the third image side lens unit Lr3 do not move 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 first image side lens unit Lr1 move monotonically toward the object side.

[0063] During zooming from the wide-angle end to the intermediate zoom position, the second image side lens unit Lr2 moves monotonically toward the object side while narrowing the distance between it and the first image side lens unit Lr1, and during zooming from the intermediate zoom position to the telephoto end, the second image side lens unit Lr2 moves monotonically toward the object side while widening the distance between it and the first image side lens unit Lr1.

[0064] During focusing from infinity to a close distance, the second image side lens unit Lr2 moves toward the image side.

[0065] [Example 4] The zoom lens L0 of the fourth embodiment has the same configuration as the zoom lens L0 of the first embodiment.

[0066] [Example 5] The zoom lens L0 of the fifth embodiment is composed of a first lens group L1 with negative refractive power, a second lens group L2 with positive refractive power, and a rear group LR, which are arranged in this order from the object side to the image side. The rear group LR is composed of a third lens group L3 with positive refractive power, an intermediate lens group Lm with negative refractive power, and a first image side lens group Lr1 with positive refractive power. The intermediate lens group Lm is composed of an aperture stop SP and a first intermediate subgroup Lma with negative refractive power that is movable in a direction having a component perpendicular to the optical axis during image blur correction, which are arranged in this order from the object side.

[0067] During zooming, the first lens unit L1 and the intermediate lens unit Lm do not move 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 first image-side lens unit Lr1 move monotonically toward the object side.

[0068] 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, and 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.

[0069] During focusing from infinity to a close distance, the second lens unit L2 moves toward the image side.

[0070] [Example 6] The zoom lens L0 of the sixth embodiment is composed of a first lens group L1 with negative refractive power, a second lens group L2 with positive refractive power, and a rear group LR, arranged in this order from the object side to the image side. The rear group LR is composed of an intermediate lens group Lm with negative refractive power, a first image side lens group Lr1 with positive refractive power, and a second image side lens group Lr2 with negative refractive power. The intermediate lens group Lm has the same configuration as the intermediate lens group Lm in the first embodiment.

[0071] During zooming, the first lens unit L1 and the intermediate lens unit Lm do not move relative to the image surface IP. During zooming from the wide-angle end to the telephoto end, the second lens unit L2 and the first image-side lens unit Lr1 move monotonically toward the object side.

[0072] During zooming from the wide-angle end to the intermediate zoom position, the second image side lens group Lr2 moves monotonically toward the object side while narrowing the distance between it and the first image side lens group Lr1. Furthermore, during zooming from the intermediate zoom position to the telephoto end, the second image side lens group Lr2 moves monotonically toward the object side while widening the distance between it and the first image side lens group Lr1.

[0073] During focusing from infinity to a close distance, the second image side lens unit Lr2 moves toward the image side.

[0074] [Example 7] The zoom lens L0 of Example 7 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, and a rear group LR. The rear group LR has the same configuration as the rear group LR in Example 1. The intermediate lens group Lm is composed of, arranged in order from the object side, an aperture stop SP, a positive first intermediate sub group Lma, a negative second intermediate sub group Lmb that is movable in a direction having a component perpendicular to the optical axis during image blur correction, and a negative third intermediate sub group Lmc.

[0075] During zooming, the first lens unit L1, the intermediate lens unit Lm, and the third image-side lens unit Lr3 do not move relative to the image surface IP.

[0076] During zooming from the wide-angle end to the telephoto end, the second lens unit L2 and the first image-side lens unit Lr1 move monotonically toward the object side.

[0077] During zooming from the wide-angle end to the intermediate zoom position, the second image side lens unit Lr2 moves monotonically toward the object side while narrowing the distance between it and the first image side lens unit Lr1. Furthermore, during zooming from the intermediate zoom position to the telephoto end, the second image side lens unit Lr2 moves monotonically toward the object side while widening the distance between it and the first image side lens unit Lr1.

[0078] During focusing from infinity to a close distance, the second image side lens unit Lr2 moves toward the image side.

[0079] [Example 8] The zoom lens L0 of the eighth embodiment has the same configuration as the zoom lens L0 of the first embodiment.

[0080] Numerical examples 1 to 8 corresponding to the first to eighth embodiments are shown below.

[0081] 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)

[0082] 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.

[0083] 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

[0084] [Numerical Example 1] 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 Side 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 2.35 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

[0085] [Numerical Example 2] 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 Side 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 A 8=-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

[0086] [Numerical Example 3] 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

[0087] [Numerical Example 4] 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

[0088] [Numerical Example 5] Unit: mm Surface Data Surface number rd nd νd 1 43.987 1.50 2.00100 29.1 2 22.323 5.79 3 161.715 1.30 1.61800 63.4 4 35.962 4.83 5 -117.031 1.20 1.49700 81.7 6 26.666 0.15 7 26.449 3.60 1.85478 24.8 8 62.938 (variable) 9 -73.722 1.00 1.85478 24.8 10 50.952 4.37 1.90043 37.4 11* -46.055 (variable) 12 29.948 1.00 1.85150 40.8 13 16.839 7.90 1.71300 53.9 14 ∞ (variable) 15(Aperture) ∞ 1.67 16* -50.628 0.80 1.61340 44.3 17 42.411 1.90 1.92286 20.9 18 100.287 (variable) 19* 20.871 8.00 1.49700 81.7 20 -222.913 0.15 21 53.476 1.35 1.78880 28.4 22 28.239 7.74 1.49700 81.7 23 -30.530 0.15 24* -32.170 1.20 1.88202 37.2 25* -414.932 (variable) Image plane ∞ Aspheric Data Page 11 K=0.00000e+00 A4=-1.90040e-07 A6=1.42072e-09 A8=-3.90164e-12 Page 16 K=0.00000e+00 A4= 2.00592e-06 A6=-1.18338e-08 A8=6.27166e-11 Page 19 K=0.00000e+00 A4=7.64732e-07 A6=1.50857e-08 A8=2.03528e-11 Page 24 K=0.00000e+00 A4=3.41308e-05 A6=-3.63301e-07 A8=8.35904e-10 Page 25 K=-3.70299e+03 A4=5.87839e-05 A6=-2.50755e-07 A8=1.14097e-09 A10=-2.46962e-12 A12=1.37599e-14 Various data Zoom ratio 1.88 Wide Angle Mid-Telephoto Focal length 20.60 31.04 38.80 F-number 2.90 2.90 2.90 Half angle of view 43.70 34.81 29.14 Image height 19.68 21.58 21.63 Optical total length 125.00 125.00 125.00 BF 29.61 41.03 45.80 d 8 16.16 2.77 2.58 d11 4.86 11.82 5.59 d14 1.50 7.93 14.35 d18 17.27 5.85 1.08 d25 29.61 41.03 45.80 Zoom lens group data Group starting plane focal length 1 1 -23.73 2 9 105.70 3 12 49.18 4 15 -71.04 5 19 41.94

[0089] [Numerical Example 6] Unit: mm Surface Data Surface number rd nd νd 1 44.816 1.50 1.80400 46.5 2 20.440 6.23 3 92.544 1.50 1.77250 49.6 4 35.808 3.49 5 -510.868 1.20 1.49700 81.7 6 47.200 0.15 7 29.071 2.64 1.85478 24.8 8 47.854 (variable) 9 47.748 1.00 2.00100 29.1 10 23.651 4.71 1.49700 81.7 11 -66.327 0.15 12* 33.352 4.66 1.58313 59.4 13* -86.801 (variable) 14(Aperture) ∞ 1.67 15 -170.704 1.00 1.85150 40.8 16 20.909 2.19 1.96300 24.1 17 63.996 3.32 18 -20.682 1.03 1.92286 20.9 19 -18.896 1.00 1.90043 37.4 20 -28.082 (variable) 21* 33.286 8.00 1.49700 81.7 22* -23.911 0.15 23 35.089 6.75 1.43875 94.7 24 -28.057 1.00 1.85478 24.8 25 -74.318 (variable) 26 34.502 1.00 1.72916 54.7 27 19.231 7.22 28 -16.925 1.50 1.58313 59.4 29* -31.176 (variable) Image plane ∞ Aspheric Data Side 12 K=0.00000e+00 A4=-3.82309e-06 A6=1.20970e-09 A8=-4.64465e-11 A10=1.38449e-13 Page 13 K=0.00000e+00 A4=-6.57377e-06 A6=1.15474e-09 Page 21 K=0.00000e+00 A4=-8.02028e-06 A6=4.65308e-09 A8=2.58858e-12 Page 22 K=0.00000e+00 A4=1.50220e-05 A6=2.27226e-09 Page 29 K=0.00000e+00 A4=-1.60566e-05 A6=1.17646e-08 A8=1.57721e-11 A10= 2.82330e-13 Various data Zoom ratio 2.35 Wide Angle Mid-Telephoto Focal length 20.60 32.37 48.50 F-number 4.08 4.08 4.12 Half angle of view 42.10 33.44 24.04 Image height 18.62 21.38 21.64 Optical total length 125.00 125.00 125.00 BF 20.19 26.18 28.91 d 8 25.10 14.83 4.56 d13 1.50 11.77 22.05 d20 12.88 7.65 1.50 d25 2.26 1.50 4.92 d29 20.19 26.18 28.91 Zoom lens group data Group starting plane focal length 1 1 -27.84 2 9 32.53 3 14 -40.71 4 21 23.28 5 26 -30.52

[0090] [Numerical Example 7] Unit: mm Surface Data Surface number rd nd νd 1 44.533 1.50 1.77250 49.6 2 20.992 5.66 3 73.567 1.50 1.80400 46.5 4 29.832 4.47 5 -172.934 1.20 1.49700 81.7 6 48.519 0.15 7 31.255 3.01 1.78880 28.4 8 68.730 (variable) 9 79.435 3.25 1.49700 81.7 10 -45.179 1.20 11 -24.562 1.00 1.83400 37.2 12 34.401 5.31 1.72916 54.7 13 -34.813 0.15 14* 42.104 5.77 1.58313 59.4 15 -35.886 (variable) 16 (Aperture) ∞ 1.53 17 -904.823 1.67 1.95375 32.3 18 -42.600 0.90 1.48749 70.2 19 107.911 1.79 20 -349.574 1.00 1.77250 49.6 21 31.263 1.20 1.84666 23.8 22 50.350 3.16 23 -19.392 1.04 1.61340 44.3 24 -34.336 (variable) 25* 49.454 6.26 1.49700 81.7 26* -26.967 0.15 27 54.481 5.64 1.49700 81.7 28 -26.236 1.00 1.85478 24.8 29 -60.992 (variable) 30 50.563 1.00 1.80400 46.5 31 27.102 7.01 32 -17.553 1.00 1.90043 37.4 33 -23.373 (variable) 34 -57.796 2.77 1.80400 46.5 35 -38.530 13.50 Image plane ∞ Aspheric Data Side 14 K=0.00000e+00 A4=-6.04468e-06 A6=-2.23904e-09 A8=-2.53345e-11 A10=1.03244e-13 Page 25 K=0.00000e+00 A4=-9.67884e-06 A6=1.40095e-08 A8=-2.52209e-11 Page 26 K=0.00000e+00 A4=1.95762e-06 A6=2.83032e-09 Various data Zoom ratio 2.35 Wide Angle Mid-Telephoto Focal length 20.60 32.48 48.50 F-number 4.08 4.08 4.12 Half angle of view 42.05 33.09 24.04 Image height 18.58 21.16 21.63 Optical total length 127.50 127.50 127.50 BF 13.50 13.50 13.50 d 8 22.55 12.11 1.68 d15 1.50 11.94 22.37 d24 10.63 6.61 1.50 d29 4.89 1.50 3.76 d33 3.14 10.54 13.39 Zoom lens group data Group starting plane focal length 1 1 -27.83 2 9 30.33 3 16 -41.01 4 25 27.38 5 30 -38.50 6 34 135.10

[0091] [Numerical Example 8] Unit: mm Surface Data Surface number rd nd νd 1 50.398 1.50 1.85150 40.8 2 18.725 6.16 3 155.705 1.50 1.72916 54.7 4 37.191 3.50 5 -104.634 1.20 1.59282 68.6 6 64.813 0.15 7 34.832 2.99 1.85478 24.8 8 108.620 (variable) 9 74.830 1.00 1.85025 30.1 10 22.625 4.49 1.59282 68.6 11 -58.626 0.15 12* 37.794 4.47 1.58313 59.4 13* -73.778 (variable) 14(Aperture) ∞ 2.26 15 -39.334 1.00 1.77250 49.6 16 42.923 1.71 1.84666 23.8 17 458.714 1.56 18 -22.853 1.07 1.95375 32.3 19 -20.412 1.50 20 -24.253 1.00 1.80400 46.5 21 -28.581 (variable) 22* 29.228 8.00 1.49700 81.7 23* -29.139 0.15 24 32.181 6.03 1.49700 81.7 25 -42.286 1.00 1.85478 24.8 26 -180.396 (variable) 27 49.616 1.00 1.90043 37.4 28 18.389 6.20 29 -20.338 1.50 1.58313 59.4 30* -39.945 (variable) 31 -56.969 6.14 1.49700 81.7 32 -25.794 13.50 Image plane ∞ Aspheric Data Side 12 K=0.00000e+00 A4=-6.12535e-06 A6=-1.29259e-08 A8=-7.84056e-11 A10=2.79666e-13 Page 13 K=0.00000e+00 A4=-8.73613e-06 A6=-1.59868e-08 Page 22 K=0.00000e+00 A4=-1.25237e-05 A6=-8.23278e-09 A8=1.89899e-12 Page 23 K=0.00000e+00 A4=1.07391e-05 A6=-1.05436e-08 Page 30 K=0.00000e+00 A4=7.72526e-06 A6=3.05513e-08 A8=1.53047e-10 A10=-6.20090e-13 Various data Zoom ratio 2.35 Wide Angle Mid-Telephoto Focal length 18.54 29.05 43.65 F-number 4.08 4.08 4.12 Half angle of view 44.84 36.68 26.37 Image height 18.44 21.64 21.64 Optical total length 126.00 126.00 126.00 BF 13.50 13.50 13.50 d 8 22.47 12.94 3.41 d13 1.50 11.03 20.56 d21 16.93 9.94 1.50 d26 2.00 1.50 3.84 d30 2.36 9.85 15.94 Zoom lens group data Group starting plane focal length 1 1 -23.21 2 9 30.59 3 14 -56.57 4 22 22.88 5 27 -21.72 6 31 89.02

[0092] Various values ​​in each numerical example are summarized in Table 1 below.

[0093] [Table 1]

[0094] [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. 17. In Fig. 17, 10 denotes a camera body, and 11 denotes an imaging optical system 11 constituted by any of the zoom lenses L0 described in the first to eighth embodiments. 12 denotes a solid-state imaging element (photoelectric conversion element) such as a CCD sensor or a 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.

[0095] 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.

[0096] [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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] The embodiments of the present invention include the following configurations.

[0101] [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, and a subsequent group including one or more lens groups, in which the distance between adjacent lens groups changes during zooming, the first lens group has two or more lenses; the subsequent group includes an intermediate lens group and a first image side lens group arranged adjacent to the intermediate lens group on the image side thereof, the intermediate lens group having an image stabilization group movable in a direction having a component perpendicular to the optical axis during image blur correction, the first lens group and the 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 side of the first lens group to the surface vertex of the lens surface closest to the image side of the first lens group, TLw be the distance on the optical axis from the surface vertex of the lens surface closest to the object side of the zoom lens to the surface vertex of the lens surface closest to the image side of the zoom lens at the wide-angle end, f1 be the focal length of the first lens group, and fis be the focal length of the vibration reduction group. 0.04 <D1 / TLw<0.30 0.05<│f1 / fis│<1.50 A zoom lens characterized by satisfying the following conditional expressions:

[0102] [Configuration 2] 2. The zoom lens according to claim 1, wherein the image stabilization group is a subgroup having a negative refractive power.

[0103] [Configuration 3] 3. The zoom lens according to configuration 1 or 2, wherein an aperture stop is disposed adjacent to the vibration isolation group.

[0104] [Configuration 4] 4. The zoom lens according to any one of configurations 1 to 3, wherein the intermediate lens group is a lens group having a negative refractive power.

[0105] [Configuration 5] 5. The zoom lens according to any one of configurations 1 to 4, wherein the image stabilization group includes one negative lens and one positive lens.

[0106] [Configuration 6] The zoom lens according to any one of configurations 1 to 5, wherein a lens group that is disposed closer to the object side than the intermediate lens group and moves during zooming moves toward the object side during zooming from the wide-angle end to the telephoto end.

[0107] [Configuration 7] 7. The zoom lens according to any one of configurations 1 to 6, wherein all of the lens groups disposed between the first lens group and the intermediate lens group have positive refractive power.

[0108] [Configuration 8] The zoom lens according to any one of configurations 1 to 7, wherein a lens group that is disposed closer to the image side than the intermediate lens group and moves during zooming moves toward the object side during zooming from the wide-angle end to the telephoto end.

[0109] [Configuration 9] 9. The zoom lens according to any one of configurations 1 to 8, wherein the first image-side lens group is a lens group having positive refractive power.

[0110] [Configuration 10] 10. The zoom lens according to any one of configurations 1 to 9, wherein the first image-side lens group has a lens including an aspheric lens surface.

[0111] [Configuration 11] 11. The zoom lens according to any one of configurations 1 to 10, wherein the lens in the first lens group arranged closest to the image side is a positive lens.

[0112] [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 disposed closest to the object side is a negative lens.

[0113] [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 arranged closest to the object side is a lens having a convex surface facing the object side.

[0114] [Configuration 14] Let β be the lateral magnification of the image stabilization group at the telephoto end, and β be the lateral magnification of an optical system including a lens arranged closer to the image side than the image stabilization group at the telephoto end. -1.54<(1-βist)×βisrt<-0.61 14. The zoom lens according to any one of configurations 1 to 13, wherein the following condition is satisfied:

[0115] [Configuration 15] When the composite focal length of the lens group disposed between the first lens group and the intermediate lens group at the telephoto end is fat, 0.30 <fat / (-fis)<0.75 15. The zoom lens according to any one of the configurations 1 to 14, wherein the following condition is satisfied:

[0116] [Configuration 16] Let Skw be the air-equivalent distance on the optical axis from the vertex of the lens surface closest to the image side to the image plane at the wide-angle end, and fw be the total system focal length of the zoom lens at the wide-angle end. 0.05 <Skw / fw<1.85 16. The zoom lens according to any one of configurations 1 to 15, wherein the following conditional expression is satisfied:

[0117] [Configuration 17] If the focal length of the intermediate lens group is fm, 0.27 <f1 / fm<0.94 17. The zoom lens according to any one of configurations 1 to 16, wherein the following condition is satisfied:

[0118] [Configuration 18] When the total focal length of the zoom lens at the wide-angle end is fw, 0.83<(-f1) / fw<1.68 18. The zoom lens according to any one of configurations 1 to 17, wherein the following condition is satisfied:

[0119] [Configuration 19] Let fat be a composite focal length of the lens group disposed between the first lens group and the intermediate lens group at a telephoto end, and ft be a total system focal length of the zoom lens at a telephoto end, 0.38 <fat / ft<1.34 19. The zoom lens according to any one of configurations 1 to 18, wherein the following conditional expression is satisfied:

[0120] [Configuration 20] Let ma be the maximum movement amount of the lens group disposed between the first lens group and the intermediate lens group during zooming from the wide-angle end to the telephoto end. 0.09<│ma│ / TLw<0.28 20. The zoom lens according to any one of configurations 1 to 19, wherein the following condition is satisfied:

[0121] [Configuration 21] When the largest movement amount of the lens group disposed closer to the image side than the intermediate lens group during zooming from the wide-angle end to the telephoto end is mb, 0.06<│mb│ / TLw<0.22 21. The zoom lens according to any one of configurations 1 to 20, which satisfies the following conditional expression:

[0122] [Configuration 22] 22. The zoom lens according to any one of configurations 1 to 21, wherein, among the lens groups constituting the zoom lens, all of the lens groups that move during zooming are moved by an actuator.

[0123] [Configuration 23] 23. An imaging device comprising the zoom lens according to any one of configurations 1 to 22.

[0124] [Configuration 24] 24. The imaging apparatus according to configuration 23, further comprising an imaging element for photoelectrically converting an optical image formed by the zoom lens. [Explanation of symbols]

[0125] L0 Zoom Lens L1 First lens group L2 Second lens group LR Successor group Lm Intermediate lens group Lr1 First image-side 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, and a subsequent group including one or more lens groups, in which the distance between adjacent lens groups changes during zooming, the first lens group includes two or more lenses; the subsequent group includes an intermediate lens group and a first image-side lens group arranged adjacent to the intermediate lens group on the image side, the intermediate lens group has a vibration isolating group that is movable in a direction having a component perpendicular to the optical axis during image blur correction; the first lens group and the 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 side of the first lens group to the surface vertex of the lens surface closest to the image side of the first lens group, TLw be the distance on the optical axis from the surface vertex of the lens surface closest to the object side of the zoom lens to the surface vertex of the lens surface closest to the image side of the zoom lens at the wide-angle end, f1 be the focal length of the first lens group, and fis be the focal length of the vibration reduction group. 0.04<D1 / TLw<0.30 0.05<|f1 / fis|<1.50 A zoom lens characterized by satisfying the following conditional expressions:

2. 2. The zoom lens according to claim 1, wherein the image stabilization group is a subgroup having a negative refractive power.

3. 2. The zoom lens according to claim 1, further comprising an aperture stop disposed adjacent to said vibration isolation group.

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

5. 2. The zoom lens of claim 1, wherein the vibration isolation group includes one negative lens and one positive lens.

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

7. 2. The zoom lens according to claim 1, wherein all of the lens groups disposed between the first lens group and the intermediate lens group have positive refractive power.

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

9. 2. The zoom lens according to claim 1, wherein the first image-side lens unit is a lens unit having a positive refractive power.

10. 2. The zoom lens according to claim 1, wherein the first image-side lens group has a lens including an aspheric lens surface.

11. 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.

12. 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.

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 lens having a convex surface facing the object side.

14. When the lateral magnification of the image stabilization group at the telephoto end is βist and the lateral magnification of an optical system including a lens arranged on the image side of the image stabilization group at the telephoto end is βisrt, -1.54<(1-βist)×βisrt<-0.61 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

15. When the composite focal length of the lens group disposed between the first lens group and the intermediate lens group at the telephoto end is fat, 0.30<fat / (-fis)<0.75 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

16. Let Skw be the air-equivalent distance on the optical axis from the vertex of the lens surface closest to the image side to the image plane at the wide-angle end, and fw be the total system focal length of the zoom lens at the wide-angle end. 0.05<Skw / fw<1.85 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

17. When the focal length of the intermediate lens group is fm, 0.27<f1 / fm<0.94 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

18. When the total system focal length of the zoom lens at the wide-angle end is fw, 0.83<(-f1) / fw<1.68 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

19. Let fat be a composite focal length at a telephoto end of the lens group disposed between the first lens group and the intermediate lens group, and ft be a total system focal length at a telephoto end of the zoom lens, 0.38<fat / ft<1.34 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

20. Let ma be the maximum movement amount of the lens group disposed between the first lens group and the intermediate lens group during zooming from the wide-angle end to the telephoto end. 0.09<|ma| / TLw<0.28 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

21. When the largest movement amount of the lens group disposed closer to the image side than the intermediate lens group during zooming from the wide-angle end to the telephoto end is defined as mb, 0.06<|mb| / TLw<0.22 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

22. 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.

23. 23. The zoom lens according to claim 3, wherein the image stabilization group is a subgroup having a negative refractive power.

24. 23. The zoom lens according to claim 4, wherein an aperture stop is disposed adjacent to the image stabilization group.

25. 25. The zoom lens according to claim 24, wherein the image stabilization group is a subgroup having a negative refractive power.

26. An imaging device comprising the zoom lens according to any one of claims 1 to 22.

27. 27. The imaging apparatus according to claim 26, further comprising an image sensor for photoelectrically converting an optical image formed by the zoom lens.

Images