Zoom lens and imaging device having the same

Abstract

To obtain a zoom lens in which deterioration in optical performance accompanying image blur correction is suppressed while an entire system is compact.SOLUTION: A zoom lens comprises a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a fourth lens group, which are arranged in order from an object side to an image side, and distances between adjacent lens groups change when zooming. At least one of the third lens group and the fourth lens group has an image blur correcting unit that moves in a direction including a component of a direction perpendicular to an optical axis when correcting an image blur. The focal distance of the first lens group, the focal distance of the second lens group, lateral magnification of the image blur correcting unit at a telephoto end, and lateral magnification which is obtained by combining all lenses arranged closer to the image side than the image blur correcting unit at the telephoto end, are appropriately set.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a zoom lens and an imaging device having the same, and is suitable for an imaging device using an imaging element such as a video camera, an electronic still camera, a broadcast camera, a surveillance camera, and the like.

Background Art

[0002] As an imaging optical system, a telephoto zoom lens having a long focal length at the telephoto end is known. In such a zoom lens, it is required to have a shake correction function in order to reduce image blur caused by vibrations such as hand shake while miniaturizing the entire system.

[0003] Patent Document 1 discloses an example of a zoom lens composed of first to fifth lens groups having positive, negative, positive, negative, and positive refractive powers arranged in order from the object side to the image side, in which four groups are used as a shake correction group.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the zoom lens of Patent Document 1, since the decentration sensitivity of the fourth lens group, which is a shake correction group, is small, the movement amount of the shake correction group becomes large, and as a result, it is difficult to sufficiently reduce the aberration generated during decentration.

[0006] Therefore, an object of the present invention is to provide a zoom lens and an imaging device having the same that are small in the entire system and suppress a decrease in optical performance associated with shake correction.

Means for Solving the Problems

[0008] This allows for a zoom lens that is compact overall while suppressing the degradation of optical performance associated with image blur correction. [Brief explanation of the drawing]

[0009] [Figure 1] Cross-sectional view of the zoom lens at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end in Example 1. [Figure 2] Longitudinal aberration diagrams of the zoom lens of Example 1 at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end. [Figure 3] Transverse aberration diagrams of the zoom lens of Example 1 at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end. [Figure 4]Transverse aberration diagram of the zoom lens of Example 1 when the image blur correction angle is 0.3 degrees at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end. [Figure 5] Cross-sectional view of the zoom lens of Example 2 at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end. [Figure 6] Longitudinal aberration diagrams of the zoom lens of Example 2 at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end. [Figure 7] Transverse aberration diagrams of the zoom lens of Example 2 at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end. [Figure 8] Transverse aberration diagram of the zoom lens in Example 2 when the image shake correction angle is 0.3 degrees at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end. [Figure 9] Cross-sectional view of the zoom lens of Example 3 at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end. [Figure 10] Longitudinal aberration diagrams of the zoom lens of Example 3 at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end. [Figure 11] Transverse aberration diagrams of the zoom lens of Example 3 at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end. [Figure 12] Transverse aberration diagram of the zoom lens in Example 3 when the image blur correction angle is 0.3 degrees at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end. [Figure 13] Cross-sectional view of the zoom lens of Example 4 at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end. [Figure 14] Longitudinal aberration diagrams of the zoom lens of Example 4 at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end. [Figure 15] Transverse aberration diagrams of the zoom lens of Example 4 at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end. [Figure 16] Transverse aberration diagram of the zoom lens in Example 4 when the image shake correction angle is 0.3 degrees at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end. [Figure 17]Lens cross-sectional views of the zoom lens of Example 5 at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end [Figure 18] Longitudinal aberration diagrams of the zoom lens of Example 5 at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end [Figure 19] Lateral aberration diagrams of the zoom lens of Example 5 at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end [Figure 20] Lateral aberration diagram when the image blur correction angle of the zoom lens of Example 5 is 0.3 degrees at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end [Figure 21] Lens cross-sectional views of the zoom lens of Example 6 at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end [Figure 22] Longitudinal aberration diagrams of the zoom lens of Example 6 at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end [Figure 23] Lateral aberration diagrams of the zoom lens of Example 6 at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end [Figure 24] Lateral aberration diagram when the image blur correction angle of the zoom lens of Example 6 is 0.3 degrees at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end [Figure 25] Lens cross-sectional views of the zoom lens of Example 7 at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end [Figure 26] Longitudinal aberration diagrams of the zoom lens of Example 7 at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end [Figure 27] Lateral aberration diagrams of the zoom lens of Example 7 at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end [Figure 28] Lateral aberration diagram when the image blur correction angle of the zoom lens of Example 7 is 0.3 degrees at (A) wide-angle end, (B) intermediate zoom position, and (C) telephoto end [Figure 29] Schematic diagram of the main part of the imaging device of the present invention<(

Mode for Carrying Out the Invention

[0010] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. The zoom lens of this embodiment has a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, and a fourth lens group arranged in order from the object side to the image side. Furthermore, it is a zoom lens in which the spacing between adjacent lens groups changes during zooming. Either the third lens group or the fourth lens group has an image blur correction unit that moves in a direction including a component perpendicular to the optical axis during image blur correction.

[0011] Figures 1(A), (B), and (C) are cross-sectional views of the zoom lens of Example 1 at the wide-angle end (short focal length end), intermediate zoom position, and telephoto end (long focal length end), respectively. Figures 2(A), (B), and (C) are longitudinal aberration diagrams of the zoom lens of Example 1 at the wide-angle end, intermediate zoom position, and telephoto end, respectively. Figures 3(A), (B), and (C) are transverse aberration diagrams of the zoom lens of Example 1 at the wide-angle end, intermediate zoom position, and telephoto end, respectively. Figures 4(A), (B), and (C) are transverse aberration diagrams of the zoom lens of Example 1 at the wide-angle end, intermediate zoom position, and telephoto end when the image blur correction angle is 0.3 degrees, respectively. Example 1 is a zoom lens with a zoom ratio of 3.77 and an open aperture F-number (Fno) of 5.83 to 9.20.

[0012] Figures 5(A), (B), and (C) are cross-sectional views of the zoom lens of Example 2 at the wide-angle end, intermediate zoom position, and telephoto end, respectively. Figures 6(A), (B), and (C) are longitudinal aberration diagrams of the zoom lens of Example 2 at the wide-angle end, intermediate zoom position, and telephoto end, respectively. Figures 7(A), (B), and (C) are transverse aberration diagrams of the zoom lens of Example 2 at the wide-angle end, intermediate zoom position, and telephoto end, respectively. Figures 8(A), (B), and (C) are transverse aberration diagrams of the zoom lens of Example 2 at the wide-angle end, intermediate zoom position, and telephoto end when the image blur correction angle is 0.3 degrees, respectively. Example 2 is a zoom lens with a zoom ratio of 4.71 and an aperture range of F5.83 to 9.20.

[0013] Figures 9(A), (B), and (C) are cross-sectional views of the zoom lens of Example 3 at the wide-angle end, intermediate zoom position, and telephoto end, respectively. Figures 10(A), (B), and (C) are longitudinal aberration diagrams of the zoom lens of Example 3 at the wide-angle end, intermediate zoom position, and telephoto end, respectively. Figures 11(A), (B), and (C) are lateral aberration diagrams of the zoom lens of Example 3 at the wide-angle end, intermediate zoom position, and telephoto end, respectively. Figures 12(A), (B), and (C) are lateral aberration diagrams of the zoom lens of Example 3 at the wide-angle end, intermediate zoom position, and telephoto end when the image blur correction angle is 0.3 degrees, respectively. Example 3 is a zoom lens with a zoom ratio of 3.76 and an aperture number of F5.83 to 9.20.

[0014] Figures 13(A), (B), and (C) are cross-sectional views of the zoom lens of Example 4 at the wide-angle end, intermediate zoom position, and telephoto end, respectively. Figures 14(A), (B), and (C) are longitudinal aberration diagrams of the zoom lens of Example 4 at the wide-angle end, intermediate zoom position, and telephoto end, respectively. Figures 15(A), (B), and (C) are lateral aberration diagrams of the zoom lens of Example 4 at the wide-angle end, intermediate zoom position, and telephoto end, respectively. Figures 16(A), (B), and (C) are lateral aberration diagrams of the zoom lens of Example 4 at the wide-angle end, intermediate zoom position, and telephoto end when the image blur correction angle is 0.3 degrees, respectively. Example 4 is a zoom lens with a zoom ratio of 3.76 and an aperture number of F5.83 to 9.20.

[0015] Figures 17(A), (B), and (C) are cross-sectional views of the zoom lens of Example 5 at its wide-angle end, intermediate zoom position, and telephoto end, respectively. Figures 18(A), (B), and (C) are longitudinal aberration diagrams of the zoom lens of Example 5 at its wide-angle end, intermediate zoom position, and telephoto end, respectively. Figures 19(A), (B), and (C) are lateral aberration diagrams of the zoom lens of Example 5 at its wide-angle end, intermediate zoom position, and telephoto end, respectively. Figures 20(A), (B), and (C) are lateral aberration diagrams of the zoom lens of Example 5 at its wide-angle end, intermediate zoom position, and telephoto end when the image blur correction angle is 0.3 degrees, respectively. Example 5 is a zoom lens with a zoom ratio of 3.77 and an aperture of F-number of 5.15 to 6.50.

[0016] Figures 21(A), (B), and (C) are cross-sectional views of the zoom lens of Example 6 at its wide-angle end, intermediate zoom position, and telephoto end, respectively. Figures 22(A), (B), and (C) are longitudinal aberration diagrams of the zoom lens of Example 6 at its wide-angle end, intermediate zoom position, and telephoto end, respectively. Figures 23(A), (B), and (C) are lateral aberration diagrams of the zoom lens of Example 6 at its wide-angle end, intermediate zoom position, and telephoto end, respectively. Figures 24(A), (B), and (C) are lateral aberration diagrams of the zoom lens of Example 6 at its wide-angle end, intermediate zoom position, and telephoto end when the image blur correction angle is 0.3 degrees, respectively. Example 6 is a zoom lens with a zoom ratio of 2.84 and an aperture number of F5.15 to 6.50.

[0017] Figures 25(A), (B), and (C) are cross-sectional views of the zoom lens of Example 7 at the wide-angle end, intermediate zoom position, and telephoto end, respectively. Figures 26(A), (B), and (C) are longitudinal aberration diagrams of the zoom lens of Example 7 at the wide-angle end, intermediate zoom position, and telephoto end, respectively. Figures 27(A), (B), and (C) are lateral aberration diagrams of the zoom lens of Example 7 at the wide-angle end, intermediate zoom position, and telephoto end, respectively. Figures 28(A), (B), and (C) are lateral aberration diagrams of the zoom lens of Example 7 at the wide-angle end, intermediate zoom position, and telephoto end when the image blur correction angle is 0.3 degrees, respectively. Example 7 is a zoom lens with a zoom ratio of 1.93 and an aperture of F4.00.

[0018] The zoom lenses in each embodiment are zoom lenses used in imaging devices such as digital cameras, video cameras, broadcast cameras, surveillance cameras, and silver halide cameras. In the lens cross-section, the left side is the object side (front) and the right side is the image side (rear). The zoom lenses in each embodiment may also be used as projection optics for projection devices (projectors), in which case the left side is the screen side and the right side is the projection target side. In the lens cross-section, L0 is the entire zoom lens system. i indicates the order of the lens groups from the object side, and Li indicates the i-th lens group.

[0019] SP stands for aperture (widest aperture F-number). IP stands for image plane. In digital cameras and video cameras, the image plane IP of a zoom lens corresponds to the image plane of a solid-state image sensor (photoelectric conversion element) such as a CCD sensor or CMOS sensor. In silver halide film cameras, the image plane IP of a zoom lens corresponds to the film plane. The arrows show the movement trajectory of the lens group when zooming from the wide-angle end to the telephoto end when focused at infinity. The dashed arrows show the direction of movement of the lens group when focusing from an object at infinity to an object at a close distance.

[0020] In the spherical aberration diagram, Fno is the F-number. The solid line d represents the d-line (wavelength 587.6 nm), and the dashed line g represents the g-line (wavelength 435.8 nm). In the astigmatism diagram, the dotted line ΔM represents the meridional image plane at the d-line, and the solid line ΔS represents the sagittal image plane at the d-line. The distortion diagram is shown for the d-line. The chromatic aberration diagram is shown for the g-line. ω is the half-angle of view (degrees). In the transverse aberration diagram, the solid line ΔM and the dashed line ΔMg represent the meridional rays of the d-line and g-line, respectively, and the dotted line ΔS represents the sagittal rays.

[0021] Each embodiment of the zoom lens has a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L3 with positive refractive power, and a fourth lens group L4 arranged in order from the object side to the image side, and the spacing between adjacent lens groups changes during zooming. By placing the lens group with positive refractive power closest to the object, it is easy to achieve a so-called telephoto type power arrangement, resulting in a configuration that is advantageous for miniaturization.

[0022] In the zoom lens of each embodiment, one of the third lens group L3 or the fourth lens group L4 has an image blur correction unit LN that moves in a direction including a component perpendicular to the optical axis when correcting image blur. By arranging the image blur correction unit LN in one of the third lens group L3 or the fourth lens group L4, the image blur correction unit LN can be positioned at a location with a small on-axial light beam, and as a result the image blur correction unit LN can be made smaller.

[0023] Let f1 be the focal length of the first lens group L1, f2 be the focal length of the second lens group L2, and βLNt be the lateral magnification of the image stabilization unit LN at the telephoto end. Furthermore, let βLRt be the lateral magnification obtained by combining all lenses positioned on the image side of the image stabilization unit LN at the telephoto end. However, if no lens group is positioned on the image side of the image stabilization unit LN, βLRt = 1.00 is used for the calculation. In this case, the zoom lens of each embodiment is: -6.0 <f1 / f2<-1.0···(1) -3.15<(1-βLNt)×βLRt<-1.90 (2) The following condition is satisfied.

[0024] Next, we will explain the technical meaning of each of the aforementioned conditional expressions.

[0025] Condition (1) relates to the focal lengths of the second lens group L2 and the first lens group L1. If the positive refractive power of the first lens group L1 becomes stronger than the upper limit of condition (1), it becomes difficult to correct aberrations. If it falls below the lower limit of condition (1), the negative refractive power of the second lens group L2 becomes stronger, causing the light beam to diverge strongly, and as a result the lens group on the image side of the second lens group L2 becomes larger.

[0026] Conditional equation (2) defines the eccentricity sensitivity TS of the image stabilization unit LN at the telephoto end. Here, the eccentricity sensitivity TS is the ratio of the vertical movement ΔL of the image stabilization unit LN to the vertical movement ΔI of the image on the image plane (imaging position) relative to the optical axis when the image stabilization unit LN is moved perpendicular to the optical axis. TS = ΔI / ΔL That is the case.

[0027] If the upper limit of condition (2) is exceeded, the amount of movement of the image blur correction unit LN required to move the image by a predetermined amount becomes large, resulting in an increase in aberrations that occur during eccentricity. If the lower limit of condition (2) is exceeded, the image moves significantly in response to small movements of the image blur correction unit LN, making it difficult to perform image blur correction with high accuracy.

[0028] Preferably, the conditional expressions (1) and (2) are set as follows. -5.8 <f1 / f2<-1.5···(1a) -3.10<(1-βLNt)×βLRt<-1.95 (2a)

[0029] More preferably, the conditional expressions (1a) and (2a) are set as follows. -5.7 <f1 / f2<-1.8···(1b) -3.05<(1-βLNt)×βLRt<-2.00 (2b)

[0030] Furthermore, it is preferable that the zoom lens of each embodiment satisfies one or more of the following conditions. -3.0<(1-βLNw)×βLRw<-1.0 (3) -10.0 <f1 / fLN<-1.0···(4) -30.0 < βLNw < 0.0 ···(5) 0.005<|dSPLNw| / dSPIPw<0.500···(6) 10.0<νLNN-νLNP<60.0 (7) -5.0 <fLN / fLR1P<-0.1···(8) -15.0 <fLFt / fLN<-1.0···(9) 0.010 <dLFPLNw / fLFPw<2.000···(10)

[0031] Let βLNw be the lateral magnification of the image stabilization unit LN when the image is in focus at the wide-angle end. Let βLRw be the combined lateral magnification of all lenses positioned on the image side of the image stabilization unit when the image is in focus at the wide-angle end. However, if there are no lens groups positioned on the image side of the image stabilization unit LN, βLRw = 1.00 is used for the calculation.

[0032] Let fLN be the focal length of the image stabilization unit LN. Let dSPLNw be the distance along the optical axis from the aperture diaphragm at the wide-angle end to the lens surface of the image stabilization unit LN closest to the object. Let dSPIPw be the distance along the optical axis from the aperture diaphragm SP to the image plane IP at the wide-angle end. Let νLNP be the average Abbe number of the materials of all the positive lenses constituting the image stabilization unit LN, and let νLNN be the average Abbe number of the materials of all the negative lenses constituting the image stabilization unit LN.

[0033] Let fLR1P be the focal length of the first positive lens LR1P, which is positioned adjacent to the image side of the image stabilization unit LN. Let fLFt be the combined focal length of all lenses positioned on the object side of the image stabilization unit at the telephoto end. Let dLFPLNw be the distance along the optical axis between the image stabilization unit LN and the second lens LA2, which is positioned adjacent to the image stabilization unit LN on the object side at the wide-angle end. Let fLFPw be the combined focal length from the lens closest to the object in the third lens group L3 to the second lens LA2 at the wide-angle end.

[0034] Next, we will explain the technical meaning of each of the aforementioned conditional expressions.

[0035] Condition (3) defines the image blur correction sensitivity of the image blur correction unit LN at the wide-angle end. If the upper limit of condition (3) is exceeded, the amount of movement of the image blur correction unit LN required to move the image by a predetermined amount becomes large, resulting in an increase in aberrations that occur during eccentricity. If the lower limit of condition (3) is exceeded, the image plane moves significantly in response to minute movements of the image blur correction unit LN, making it difficult to perform image blur correction with high accuracy.

[0036] Condition (4) relates to the focal length of the image blur correction unit LN and the focal length of the first lens group L1. If the positive refractive power of the first lens group L1 becomes stronger than the upper limit of condition (4), it becomes difficult to correct various aberrations. If the negative refractive power of the image blur correction unit LN becomes stronger than the lower limit of condition (4), the aberrations that occur during eccentricity increase.

[0037] Condition (5) defines the lateral magnification of the image stabilization unit LN when focusing at infinity at the wide-angle end. If the value exceeds the upper limit of condition (5), the amount of movement required for the image stabilization unit LN to move the image by a predetermined amount increases, and the aberrations that occur during eccentricity increase. If the value falls below the lower limit of condition (5), the angle of the on-axis marginal rays emitted from the image stabilization unit LN towards the image side at the wide-angle end becomes approximately parallel to the optical axis. As a result, in order to miniaturize the entire zoom lens system L0, the refractive power of the lens group on the image side of the image stabilization unit LN increases, making it difficult to correct various aberrations.

[0038] Condition (6) relates to the position of the aperture diaphragm SP at the wide-angle end. If the upper limit of condition (6) is exceeded, the distance along the optical axis from the aperture diaphragm at the wide-angle end to the lens surface closest to the object on the image stabilization unit LN becomes large. As a result, aberrations related to eccentricity that occur off-axis during image stabilization increase. If the lower limit of condition (6) is exceeded, the distance along the optical axis from the aperture diaphragm at the wide-angle end to the lens surface closest to the object on the image stabilization unit LN becomes small, making it difficult to position the image stabilization unit LN.

[0039] Condition (7) relates to the Abbe number of the lens materials constituting the image stabilization unit LN. When the difference in Abbe numbers exceeds the upper limit of condition (7), the partial dispersion ratio θgF with respect to the g-line and F-line of all positive lenses constituting the image stabilization unit LN increases, making it difficult to correct second-order axial chromatic aberration. Conversely, when the difference in Abbe numbers falls below the lower limit of condition (7), the refractive power of each lens constituting the image stabilization unit LN increases in order to abolish color, making it difficult to correct various aberrations.

[0040] Condition (8) relates to the focal length of the first positive lens LR1P, which is positioned adjacent to the image side of the image stabilization unit LN, and the image stabilization unit LN. If the negative refractive power of the image stabilization unit LN becomes stronger than the upper limit of condition (8), it becomes difficult to correct aberrations that occur during eccentricity. If the positive refractive power of the first positive lens LR1P becomes stronger than the lower limit of condition (8), it becomes difficult to correct various aberrations.

[0041] Condition (9) relates to the combined focal length of all lenses positioned on the object side of the image stabilization unit LN at the telephoto end. If the upper limit of condition (9) is exceeded, the combined refractive power of all lenses positioned on the object side of the image stabilization unit LN at the telephoto end becomes strong, making it difficult to correct aberrations. If the lower limit of condition (9) is exceeded, the combined refractive power of all lenses positioned on the object side of the image stabilization unit LN at the telephoto end becomes weak, resulting in the front principal point being positioned towards the image plane and the overall zoom lens length L0 becoming longer.

[0042] Condition (10) relates to the optical axis distance between the image stabilization unit LN and the adjacent lens. If the upper limit of condition (10) is exceeded, the optical axis distance between the image stabilization unit LN and the second lens LA2, which is positioned adjacent to the image stabilization unit LN on the object side, increases. As a result, the overall zoom lens system L0 becomes longer. If the lower limit of condition (10) is exceeded, the optical axis distance between the image stabilization unit LN and the second lens LA2, which is positioned adjacent to the image stabilization unit LN on the object side, decreases. As a result, the on-axial light beam incident on the image stabilization unit LN from the object side increases, and the image stabilization unit LN becomes larger.

[0043] Preferably, conditional expressions (3) to (10) should be set as follows. -2.6<(1-βLNw)×βLRw<-1.2 (3a) -8.0 <f1 / fLN<-1.5···(4a) -15.0 < βLNw < -0.3 ···(5a) 0.010<|dSPLNw| / dSPIPw<0.300 (6a) 12.0<νLNN-νLNP<55.0 (7a) -3.0 <fLN / fLR1P<-0.2···(8a) -12.0 <fLFt / fLN<-2.0···(9a) 0.020 <dLFPLNw / fLFPw<1.000···(10a)

[0044] More preferably, the conditional expressions (3a) to (10a) should be set as follows. -2.4<(1-βLNw)×βLRw<-1.4 (3b) -7.5 <f1 / fLN<-2.0···(4b) -10.0 < βLNw < -0.5 ···(5b) 0.013<|dSPLNw| / dSPIPw<0.150···(6b) 14.0<νLNN-νLNP<45.0 (7b) -2.5 <fLN / fLR1P<-0.3···(8b) -9.0 <fLFt / fLN<-2.5···(9b) 0.030 <dLFPLNw / fLFPw<0.800···(10b)

[0045] Furthermore, the third lens group L3 has a first subgroup and a second subgroup arranged sequentially from the object side to the image side, and it is preferable that the image blur correction unit LN is in the second subgroup. By making the image blur correction unit LN in the second subgroup, the image blur correction unit LN can be positioned at a location where the on-axial light beam is relatively small, and the correction unit LN becomes more compact.

[0046] In each embodiment, by identifying each element as described above, a zoom lens is obtained that is compact overall while suppressing the degradation of optical performance associated with image blur correction.

[0047] Next, the lens configuration of each embodiment will be described in detail. The zoom lens of Embodiment 1 has a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L2 with positive refractive power, and a fourth lens group L4 with negative refractive power. Furthermore, on the image side of the fourth lens group L4, from the object side, there is a fifth lens group L5 with positive refractive power, a sixth lens group L6 with negative refractive power, a seventh lens group L7 with positive refractive power, and an eighth lens group L8 with negative refractive power. The zoom lens of Embodiment 1 has an 8-group lens configuration. By using an 8-group lens configuration, aberrations are well corrected throughout the entire zoom range.

[0048] The fourth lens group L4 corresponds to the image stabilization unit LN. During zooming, the spacing between adjacent lens groups from the first lens group L1 to the eighth lens group L8 changes, and the third lens group L3, fifth lens group L5, and seventh lens group L7 move along the same trajectory. By using the same trajectory, relative eccentricity caused by manufacturing errors between the third lens group L3, fifth lens group L5, and seventh lens group is suppressed, and as a result, various aberrations are suppressed throughout the entire zoom range.

[0049] The zoom lens of Example 2 consists of a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L2 with positive refractive power, a fourth lens group L4 with negative refractive power, and a fifth lens group with positive refractive power. By using a five-group configuration, relative eccentricity caused by manufacturing errors between lens groups is reduced compared to configurations with six or more groups, and as a result, aberrations are further suppressed throughout the entire zoom range. When zooming, the spacing between adjacent lens groups from the first lens group L1 to the fifth lens group L5 changes.

[0050] The zoom lenses of Examples 3 to 5 consist of a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L2 with positive refractive power, a fourth lens group L4 with negative refractive power, a fifth lens group with positive refractive power, and a sixth lens group with negative refractive power. By using a portion of the third lens group L3 as an image shake correction unit LN, the image shake correction unit LN is made lighter. During zooming, the spacing between adjacent lens groups from the first lens group L1 to the sixth lens group L6 changes, and the third lens group L3 and the fifth lens group L5 move along the same trajectory.

[0051] The zoom lens of Example 6 has a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L2 with positive refractive power, and a fourth lens group L4 with positive refractive power. Furthermore, closer to the image than the fourth lens group L4, it has a fifth lens group L5 with negative refractive power, a sixth lens group L6 with positive refractive power, a seventh lens group L7 with negative refractive power, and an eighth lens group L8 with positive refractive power. In addition, the three lenses closest to the object in the fourth lens group L4 correspond to the image blur correction unit LN. During zooming, the spacing between adjacent lens groups from the first lens group L1 to the eighth lens group L8 changes, and the fourth lens group L4 and the sixth lens group L6 move along the same trajectory.

[0052] The zoom lens of Example 7 consists of a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L2 with positive refractive power, and a fourth lens group L4 with negative refractive power. By using a four-group configuration, relative eccentricity caused by manufacturing errors between lens groups is reduced compared to configurations with five or more groups, and as a result, aberrations are further suppressed throughout the entire zoom range. In addition, the second to fourth lenses from the object side of the fourth lens group L4 correspond to the image blur correction unit LN. Furthermore, during zooming, the spacing between adjacent lens groups from the first lens group L1 to the fourth lens group L4 changes.

[0053] Furthermore, in Examples 1 to 7, it is preferable that all the lenses used are spherical lenses in order to suppress the deterioration of optical performance due to manufacturing errors.

[0054] Next, an example of a digital still camera (imaging device) using the optical system (zoom lens) of this embodiment as the imaging optical system will be described with reference to Figure 29. In Figure 29, 10 is the camera body, and 11 is the imaging optical system composed of any of the optical systems described in Examples 1 to 7. 12 is a solid-state image sensor (photoelectric conversion element) such as a CCD sensor or CMOS sensor, which is built into the camera body and receives the optical image formed by the imaging optical system 11 and converts it into photoelectric light. The camera body 10 may be a so-called single-lens reflex camera with a quick-turn mirror, or a so-called mirrorless camera without a quick-turn mirror.

[0055] By applying the optical system of this embodiment to an imaging device such as a digital still camera, it is possible to obtain an imaging device with a compact lens and suppressed degradation of optical performance due to image blur correction.

[0056] The following shows specific numerical values ​​corresponding to Examples 1 to 7.

[0057] In the surface data for each numerical example, r represents the radius of curvature of each optical surface, and d (mm) represents the on-axial spacing (distance along the optical axis) between the m-th surface and the (m+1)-th surface. Here, m is the surface number counted from the light incidence side. Furthermore, nd represents the refractive index of each optical element with respect to the d-line, and νd represents the Abbe number of the optical element. Note that the Abbe number νd of a certain material is given by Nd, NF, and NC, respectively, when the refractive indices at the Fraunhofer lines d-line (587.6 nm), F-line (486.1 nm), and C-line (656.3 nm) are Nd, NF, and NC, respectively. It is expressed as νd = (Nd-1) / (NF-NC).

[0058] Furthermore, in each numerical example, d, focal length (mm), F-number, and half-angle of view (°) are all values ​​when the optical system of each example is focused on an object at infinity. "Back focus BF" is the distance along the optical axis from the final lens surface (the lens surface closest to the image) to the paraxial image plane, expressed in terms of air equivalent length. "Total lens length" is the length obtained by adding the back focus to the distance along the optical axis from the frontmost lens surface (the lens surface closest to the object) to the final surface of the zoom lens. "Lens group" includes not only cases where it is composed of multiple lenses, but also cases where it is composed of a single lens.

[0059] Furthermore, Table 1 shows the relationship between each of the aforementioned conditional expressions and each numerical example.

[0060] [Numerical Example 1] Unit: mm Surface data Face number rd nd νd 1 206.964 8.30 1.49700 81.5 2 -593.117 61.22 3 120.922 9.18 1.49700 81.5 4 -235.093 3.19 1.61340 44.3 5 170.098 (variable) 6 -185.139 1.97 1.67790 55.3 7 79.668 3.60 8 -96.912 1.59 1.67790 55.3 9 76.592 3.94 1.85478 24.8 10 2392.937 (variable) 11 164.793 4.94 1.61800 63.4 12 -143.576 0.25 13 63.708 5.92 1.61800 63.4 14 -615.363 0.50 15 62.069 6.29 1.49700 81.5 16 -163.723 1.75 1.77047 29.7 17 73.337 35.43 18 (aperture) ∞ (variable) 19 -371.663 2.72 1.85478 24.8 20 -59.669 1.80 1.77250 49.6 21 101.833 2.78 22 -1316.250 1.38 1.81600 46.6 23 99.964 (Variable) 24 43.101 4.09 1.77047 29.7 25 -80.687 0.49 26 28.467 3.93 1.48749 70.2 27 -53.917 1.24 2.05090 26.9 28 73.633 (Variable) 29 993.188 2.86 1.85478 24.8 30 -41.435 1.44 1.91082 35.3 31 45.186 (Variable) 32 1362.137 3.73 1.65412 39.7 33 -33.576 2.00 34 -70.788 1.86 2.00069 25.5 35 20.994 6.80 1.85478 24.8 36 -121.514 (variable) 37 -27.650 1.77 1.49700 81.5 38 37.025 6.56 1.61340 44.3 39 -67.390 (variable) Image plane ∞ Various data Zoom ratio 3.77 Wide-angle, Medium, Telephoto Focal length 205.97 400.00 775.76 F-number 5.83 7.10 9.20 Field of view 6.00 3.10 1.60 Image height 21.64 21.64 21.64 Lens length: 332.95, 389.89, 422.95 BF 38.28 62.52 88.30 d 5 4.92 61.87 94.92 d10 42.18 25.58 1.53 d18 2.94 5.83 9.05 d23 8.40 5.51 2.29 d28 4.31 3.06 2.06 d31 21.94 23.19 24.19 d36 13.85 6.21 4.48 d39 38.28 62.52 88.30 Zoom lens group data Group starting plane focal length 1 1 290.58 2 6 -57.24 3 11 61.46 4 19 -56.75 5 24 43.54 6 29 -48.48 7 32 154.60 8 37 -203.15

[0061] [Numerical Example 2] Unit: mm Surface data Face number rd nd νd 1 212.580 11.67 1.49700 81.5 2 -536.522 49.92 3 241.002 9.72 1.49700 81.5 4 -256.261 3.16 1.85150 40.8 5 755.537 (variable) 6 166.962 4.38 1.85478 24.8 7 -2864.805 18.79 8 -716.360 1.97 1.76385 48.5 9 69.369 5.05 10 -72.250 1.69 1.87070 40.7 11 103.624 3.20 1.85478 24.8 12 1636.426 (variable) 13 86.908 5.25 1.59282 68.6 14 -180.962 0.33 15 58.359 4.48 1.49700 81.5 16 302.216 13.75 17 80.959 4.53 1.49700 81.5 18 -110.299 1.77 2.05090 26.9 19 232.769 26.35 20 (aperture) ∞ (variable) 21 316.641 2.79 1.85478 24.8 22 -71.231 1.77 1.71300 53.9 23 99.408 1.52 24 -6654.634 1.36 2.00100 29.1 25 73.542 (Variable) 26 39.804 3.88 1.85478 24.8 27 -92.993 0.49 28 27.012 3.92 1.48749 70.2 29 -50.535 1.19 2.05090 26.9 30 58.149 2.81 31 103.044 2.63 1.85478 24.8 32 -69.604 1.38 2.00100 29.1 33 37.920 21.92 34 -251.601 3.88 1.85478 24.8 35 -25.627 1.00 36 -28.154 4.62 1.85478 24.8 37 -14.786 1.78 1.92119 24.0 38 -114.409 10.81 39 -37.638 1.78 1.49700 81.5 40 59.476 4.27 1.72825 28.5 41 -124.471 (variable) Image plane ∞ Various data Zoom ratio 4.71 Wide-angle, Medium, Telephoto Focal length 205.79 399.97 969.72 F-number 5.83 7.10 9.20 Field of view 6.00 3.10 1.28 Image height 21.64 21.64 21.64 Lens length: 353.74 x 411.26 x 453.74 BF 40.62 58.80 85.06 d 5 4.90 62.42 104.90 d12 56.74 36.92 1.96 d20 2.95 5.67 17.24 d25 6.10 5.02 2.15 d41 40.62 58.80 85.06 Zoom lens group data Group starting plane focal length 1 1 336.94 2 6 -59.49 3 13 66.02 4 21 -61.95 5 26 87.10

[0062] [Numerical Example 3] Unit: mm Surface data Face number rd nd νd 1 122.535 8.95 1.51823 58.9 2 1038.893 49.52 3 85.114 11.60 1.49700 81.5 4 -462.637 3.44 1.61340 44.3 5 65.939 2.89 6 98.900 4.65 1.49700 81.5 7 194.580 (Variable) 8 212.100 1.81 1.90366 31.3 9 59.884 5.01 10 -57.235 0.87 1.53775 74.7 11 80.422 3.20 1.84666 23.8 12 -332.106 (variable) 13 -363.162 3.23 1.49700 81.5 14 -67.701 0.47 15 280.295 2.52 1.49700 81.5 16 -259.775 0.48 17 126.588 5.39 1.49700 81.5 18 -58.420 1.46 1.90366 31.3 19 -191.320 1.18 20 (aperture) ∞ 3.00 21 4787.801 2.99 1.84666 23.8 22 -95.069 1.41 1.72916 54.7 23 158.075 2.59 24 -111.485 0.86 1.95375 32.3 25 -1946.665 1.15 26 53.352 5.10 1.48749 70.2 27 -214.830 42.17 28 80.622 4.04 1.61340 44.3 29 -37.659 1.16 1.90366 31.3 30 -144.300 (variable) 31 71.913 2.80 1.59270 35.3 32 -326.337 1.46 1.83481 42.7 33 45.409 1.32 34 131.154 1.26 2.00100 29.1 35 73.943 (variable) 36 144.298 1.47 1.92286 20.9 37 52.432 4.90 1.85478 24.8 38 -100.047 (variable) 39 -81.208 2.68 1.61340 44.3 40 -42.119 1.37 1.49700 81.5 41 58.229 (Variable) Image plane ∞ Various data Zoom ratio 3.76 Wide-angle, Medium, Telephoto Focal length 206.15 399.97 775.32 F-number 5.83 7.10 9.20 Field of view 5.99 3.10 1.60 Image height 21.64 21.64 21.64 Lens length: 331.64 x 389.45 x 421.64 BF 38.49 63.50 102.51 d 7 4.74 62.55 94.74 d12 39.75 27.66 2.47 d30 13.52 8.02 0.93 d35 19.12 24.62 31.71 d38 27.62 14.71 0.89 d41 38.49 63.50 102.51 Zoom lens group data Group starting plane focal length 1 1 296.96 2 8 -72.59 3 13 75.20 4 31 -61.02 5 36 74.13 6 39 -74.43

[0063] [Numerical Example 4] Unit: mm Surface data Face number rd nd νd 1 230.968 8.19 1.49700 81.5 2 -481.702 62.59 3 126.173 10.81 1.49700 81.5 4 -203.281 3.17 1.61340 44.3 5 186.341 (variable) 6 -304.993 1.96 1.67790 55.3 7 90.694 3.70 8 -81.142 1.69 1.67790 55.3 9 81.039 3.81 1.85478 24.8 10 1535.448 (variable) 11 157.199 4.66 1.61800 63.4 12 -179.250 0.45 13 67.740 6.67 1.61800 63.4 14 -829.165 1.73 15 66.590 5.98 1.49700 81.5 16 -150.930 1.78 1.77047 29.7 17 83.778 30.33 18 (aperture) ∞ 11.27 19 -1130.345 3.94 1.85478 24.8 20 -68.654 2.54 1.77250 49.6 21 91.924 2.81 22 2970.488 1.39 1.81600 46.6 23 96.309 2.12 24 43.760 4.05 1.77047 29.7 25 -85.878 0.48 26 27.119 4.00 1.48749 70.2 27 -57.758 1.29 2.05090 26.9 28 70.856 (Variable) 29 349.660 2.96 1.85478 24.8 30 -42.089 1.46 1.91082 35.3 31 42.093 (Variable) 32 269.912 3.81 1.65412 39.7 33 -33.441 2.00 34 -63.518 2.00 2.00069 25.5 35 18.606 6.12 1.85478 24.8 36 -118.142 (variable) 37 -28.349 1.72 1.49700 81.5 38 28.192 6.75 1.61340 44.3 39 -91.152 (variable) Image plane ∞ Various data Zoom ratio 3.76 Wide-angle, Medium, Telephoto Focal length 206.06 399.98 775.77 F-number 5.83 7.10 9.20 Field of view 5.99 3.10 1.60 Image height 21.64 21.64 21.64 Lens length: 330.21, 387.49, 420.21 BF 38.09 59.70 88.02 d 5 4.76 62.04 94.76 d10 45.93 28.29 1.94 d28 4.16 2.97 1.82 d31 19.13 20.32 21.46 d36 9.91 5.95 3.98 d39 38.09 59.70 88.02 Zoom lens group data Group starting plane focal length 1 1 290.39 2 6 -59.91 3 11 65.67 4 29 -48.98 5 32 157.86 6 37 -164.48

[0064] [Numerical Example 5] Unit: mm Surface data Face number rd nd νd 1 206.748 3.18 1.80440 39.6 2 111.336 9.93 1.49700 81.5 3 603.896 0.50 4 125.924 10.32 1.49700 81.5 5 13500.930 (variable) 6 -234.529 2.00 1.72916 54.7 7 84.340 4.91 8 -54.504 1.79 1.48749 70.2 9 99.998 4.36 1.84666 23.8 10 760.714 (variable) 11 -171.256 4.22 1.61800 63.4 12 -54.202 0.49 13 328.480 3.58 1.49700 81.5 14 -118.561 0.49 15 99.330 6.03 1.49700 81.5 16 -55.181 1.72 1.83400 37.2 17 -366.101 6.06 18 (aperture) ∞ 4.88 19 -236.301 2.58 1.84666 23.8 20 -86.907 1.66 1.65160 58.5 21 128.707 2.59 22 -97.226 1.37 1.55200 70.7 23 -5334.251 2.45 24 46.009 4.36 1.48749 70.2 25 391.797 10.17 26 55.070 1.40 1.87070 40.7 27 28.456 6.97 1.48749 70.2 28 -198.798 (variable) 29 205.546 3.40 1.72047 34.7 30 -60.421 1.48 1.73400 51.5 31 96.000 4.61 32 62.616 1.47 1.90043 37.4 33 43.158 (Variable) 34 82.456 1.39 1.92286 20.9 35 45.189 5.79 1.77250 49.6 36 -88.410 (variable) 37 -163.070 1.70 1.95375 32.3 38 53.277 1.84 39 204.165 1.70 1.81600 46.6 40 28.770 5.59 1.85478 24.8 41 -2543.090 (variable) Image plane ∞ Various data Zoom ratio 3.77 Wide-angle, Medium, Telephoto Focal length 154.33 300.00 581.74 F-numbers: 5.15, 5.83, 6.50 Field of view 7.98 4.12 2.13 Image height 21.64 21.64 21.64 Lens length: 302.81, 370.45, 392.81 BF 38.99 50.70 81.11 d 5 46.69 114.34 136.69 d10 26.97 25.03 3.81 d28 20.81 8.67 7.10 d33 17.79 29.93 31.50 d36 21.94 12.17 2.99 d41 38.99 50.70 81.11 Zoom lens group data Group starting plane focal length 1 1 238.58 2 6 -53.68 3 11 66.35 4 29 -93.71 5 34 61.22 6 37 -56.08

[0065] [Numerical Example 6] Unit: mm Surface data Face number rd nd νd 1 221.441 3.17 1.90043 37.4 2 124.688 9.43 1.49700 81.5 3 922.268 0.50 4 142.932 10.10 1.49700 81.5 5 -1352.320 (variable) 6 -322.416 1.95 1.48749 70.2 7 187.582 3.15 8 -168.155 1.74 1.48749 70.2 9 50.039 4.24 1.80000 29.8 10 97.865 (Variable) 11 318.886 4.44 1.59522 67.7 12 -125.772 0.50 13 73.014 4.15 1.49700 81.5 14 364.214 1.42 15 57.875 8.16 1.49700 81.5 16 -70.707 2.07 1.60562 43.7 17 45.043 4.98 18 (aperture) ∞ (variable) 19 2010.955 2.67 1.84666 23.8 20 -125.252 1.70 1.65160 58.5 21 167.064 1.81 22 -163.961 1.30 1.87070 40.7 23 258.243 2.44 24 140.660 3.79 1.48749 70.2 25 -98.523 0.49 26 61.544 4.83 1.78590 44.2 27 -76.294 1.40 2.00100 29.1 28 455.877 (variable) 29 -96.948 3.78 1.80000 29.8 30 -50.100 2.03 1.73400 51.5 31 75.310 6.55 32 -127.914 2.16 1.61340 44.3 33 -55.090 (variable) 34 90.953 1.44 1.92286 20.9 35 42.232 5.51 1.67300 38.3 36 -68.194 (variable) 37 -189.053 1.71 2.00100 29.1 38 37.420 1.91 39 40.851 6.04 1.85478 24.8 40 -41.656 1.72 1.87070 40.7 41 72.569 (Variable) 42 78.944 3.29 1.48749 70.2 43 217.192 (variable) Image plane ∞ Various data Zoom ratio 2.84 Wide-angle, Medium, Telephoto Focal length 205.04 400.01 581.76 F-numbers: 5.15, 5.83, 6.50 Field of view 6.02 3.10 2.13 Image height 21.64 21.64 21.64 Lens length: 280.31 x 346.66 x 370.31 BF 38.99 38.99 38.99 d 5 25.14 91.49 115.14 d10 24.56 18.04 3.64 d18 20.45 15.23 4.89 d28 13.87 5.94 3.51 d33 9.41 17.35 19.77 d36 27.32 11.81 2.99 d41 4.00 31.26 64.81 d43 38.99 38.99 38.99 Zoom lens group data Group starting plane focal length 1 1 243.41 2 6 -110.56 3 11 125.13 4 19 154.59 5 29 -106.73 6 34 71.79 7 37 -42.43 8 42 252.44

[0066] [Numerical Example 7] Unit: mm Surface data Face number rd nd νd 1 501.062 8.79 1.48749 70.2 2 -466.515 0.44 3 137.562 12.59 1.49700 81.5 4 2797.067 31.18 5 135.395 8.75 1.43387 95.1 6 -8264.421 0.45 7 -1504.355 3.03 1.83400 37.2 8 140.857 (variable) 9 77.013 6.48 1.85478 24.8 10 1820.289 1.97 1.67790 55.3 11 55.531 7.34 12 -391.100 1.52 1.91082 35.3 13 204.156 3.90 14 -105.561 1.83 1.81600 46.6 15 -454.445 (variable) 16 -1937.975 3.83 1.72916 54.7 17 -125.495 0.25 18 155.039 4.33 1.49700 81.5 19 -347.667 0.25 20 82.145 7.87 1.49700 81.5 21 -87.994 1.99 1.88300 40.8 22 179.247 33.20 23 1663.437 4.17 1.84666 23.8 24 -104.129 0.38 25 57.456 7.61 1.75500 52.3 26 -145.699 3.07 1.85478 24.8 27 87.240 3.61 28 (aperture) ∞ 4.10 29 37.151 3.17 1.58913 61.1 30 26.316 (Variable) 31 589.993 1.46 1.77250 49.6 32 61.283 2.02 33 -140.181 1.41 1.85026 32.3 34 28.053 3.42 1.84666 23.8 35 142.112 2.05 36 36.145 2.82 1.81600 46.6 37 68.753 0.99 38 134.512 1.47 2.00100 29.1 39 29.887 3.99 1.59551 39.2 40 -158.768 40.21 41 90.095 4.68 1.90043 37.4 42 -176.957 3.33 43 -83.409 1.48 1.48749 70.2 44 242.851 (variable) Image plane ∞ Various data Zoom ratio 1.93 Wide-angle, Medium, Telephoto Focal length 205.02 385.01 396.16 F-number 4.00 4.00 4.00 Field of view 6.02 3.22 3.13 Image height 21.64 21.64 21.64 Lens length 360.03 360.03 360.03 BF 61.15 61.15 61.15 d 8 5.01 51.50 54.65 d15 52.34 2.37 0.09 d30 6.09 9.56 8.69 d44 61.15 61.15 61.15 Zoom lens group data Group starting plane focal length 1 1 299.41 2 9 -77.82 3 16 69.28 4 31 -690.03

[0067] [Table 1]

[0068] Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of its essence. [Explanation of symbols]

[0069] L0 Zoom Lens Series L1 First lens group L2 Second lens group L3 Third lens group L4 4th lens group LN Image Blur Correction Unit

Claims

1. A zoom lens having a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, and a fourth lens group arranged in order from the object side to the image side, wherein the spacing between adjacent lens groups changes during zooming, The third lens group comprises a first subgroup and a second subgroup arranged sequentially from the object side to the image side, and the second subgroup is an image blur correction unit that moves in a direction including a component perpendicular to the optical axis during image blur correction. When the focal length of the first lens group is f1, the focal length of the second lens group is f2, the lateral magnification of the image stabilization unit at the telephoto end is βLNt, the combined lateral magnification of all lenses positioned on the image side of the image stabilization unit at the telephoto end is βLRt, the image stabilization unit has a positive lens and a negative lens, the average value of the Abbe numbers of the materials of all the positive lenses constituting the image stabilization unit is νLNP, and the average value of the Abbe numbers of the materials of all the negative lenses constituting the image stabilization unit is νLNN, -4.85≦f1 / f2<-1.0 -3.15<(1-βLNt)×βLRt<-1.90 10.0<νLNN−νLNP<60.0 A zoom lens characterized by satisfying the following conditional equation.

2. When the lateral magnification of the image stabilization unit at the wide-angle end is βLNw, and the combined lateral magnification of all lenses positioned on the image side of the image stabilization unit at the wide-angle end is βLRw, -3.0<(1-βLNw)×βLRw<-1.0 The zoom lens according to claim 1, characterized in that it satisfies the following condition.

3. When the focal length of the image blur correction unit is fLN, -10.0<f1 / fLN<-1.0 A zoom lens according to claim 1 or 2, characterized in that it satisfies the following conditional expression.

4. When the horizontal magnification of the image blur correction unit at the wide-angle end is βLNw, -30.0<βLNw<0.0 A zoom lens according to any one of claims 1 to 3, characterized in that it satisfies the following conditional expression.

5. The zoom lens has an aperture diaphragm, and when the distance along the optical axis from the aperture diaphragm at the wide-angle end to the lens surface closest to the object of the image stabilization unit is dSPLNw, and the distance along the optical axis from the aperture diaphragm at the wide-angle end to the image plane is dSPIPw, 0.005<|dSPLNw| / dSPIPw<0.500 A zoom lens according to any one of claims 1 to 4, characterized in that it satisfies the following conditional expression.

6. The zoom lens has a first positive lens positioned adjacent to the image side of the image stabilization unit, and when the focal length of the image stabilization unit is fLN and the focal length of the first positive lens is fLR1P, -5.0<fLN / fLR1P<-0.1 A zoom lens according to any one of claims 1 to 5, characterized in that it satisfies the following conditional expression.

7. When the focal length of the image stabilization unit is fLN, and the combined focal length of all lenses positioned on the object side of the image stabilization unit at the telephoto end is fLFt, -15.0<fLFt / fLN<-1.0 A zoom lens according to any one of claims 1 to 6, characterized in that it satisfies the following conditional expression.

8. When the distance along the optical axis between the image blur correction unit at the wide-angle end and the second lens positioned adjacent to the object side of the image blur correction unit is dLFPLNw, and the combined focal length at the wide-angle end from the lens closest to the object in the third lens group to the second lens is fLFPw, 0.010<dLFPLNw / fLFPw<2.000 A zoom lens according to any one of claims 1 to 7, characterized in that it satisfies the following conditional expression.

9. The zoom lens is characterized in that it comprises the first lens group, the second lens group, the third lens group, the fourth lens group with negative refractive power, the fifth lens group with positive refractive power, the sixth lens group with negative refractive power, the seventh lens group with positive refractive power, and the eighth lens group with negative refractive power, arranged in order from the object side to the image side, as described in any one of claims 1 to 8.

10. A zoom lens consisting of a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, a fourth lens group with negative refractive power, a fifth lens group with positive refractive power, a sixth lens group with negative refractive power, a seventh lens group with positive refractive power, and an eighth lens group with negative refractive power, arranged sequentially from the object side to the image side, wherein the spacing between adjacent lens groups changes during zooming. The third lens group or the fourth lens group has an image blur correction unit that moves in a direction including a component perpendicular to the optical axis when correcting image blur. When the focal length of the first lens group is f1, the focal length of the second lens group is f2, the lateral magnification of the image stabilization unit at the telephoto end is βLNt, and the combined lateral magnification of all lenses positioned on the image side of the image stabilization unit at the telephoto end is βLRt, -6.0<f1 / f2<-1.0 -3.15<(1-βLNt)×βLRt<-1.90 A zoom lens characterized by satisfying the following conditional equation.

11. The zoom lens is characterized in that it comprises the first lens group, the second lens group, the third lens group, the fourth lens group with negative refractive power, and the fifth lens group with positive refractive power, arranged in order from the object side to the image side, as described in any one of claims 1 to 8.

12. The zoom lens according to any one of claims 1 to 8, characterized in that it comprises the first lens group, the second lens group, the third lens group, the fourth lens group with negative refractive power, the fifth lens group with positive refractive power, and the sixth lens group with negative refractive power, arranged in order from the object side to the image side.

13. The zoom lens is characterized in that it comprises the first lens group, the second lens group, the third lens group, the fourth lens group with positive refractive power, the fifth lens group with negative refractive power, the sixth lens group with positive refractive power, the seventh lens group with negative refractive power, and the eighth lens group with positive refractive power, arranged in order from the object side to the image side, as described in any one of claims 1 to 8.

14. A zoom lens consisting of a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, a fourth lens group with positive refractive power, a fifth lens group with negative refractive power, a sixth lens group with positive refractive power, a seventh lens group with negative refractive power, and an eighth lens group with positive refractive power, arranged sequentially from the object side to the image side, wherein the spacing between adjacent lens groups changes during zooming. The third lens group or the fourth lens group has an image blur correction unit that moves in a direction including a component perpendicular to the optical axis when correcting image blur. When the focal length of the first lens group is f1, the focal length of the second lens group is f2, the lateral magnification of the image stabilization unit at the telephoto end is βLNt, and the combined lateral magnification of all lenses positioned on the image side of the image stabilization unit at the telephoto end is βLRt, -6.0<f1 / f2<-1.0 -3.15<(1-βLNt)×βLRt<-1.90 A zoom lens characterized by satisfying the following conditional equation.

15. The zoom lens according to any one of claims 1 to 8, characterized in that the zoom lens comprises the first lens group, the second lens group, the third lens group, and the fourth lens group having negative refractive power, arranged in order from the object side to the image side.

16. A zoom lens consisting of a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, and a fourth lens group with negative refractive power, arranged sequentially from the object side to the image side, wherein the spacing between adjacent lens groups changes during zooming. The third lens group or the fourth lens group has an image blur correction unit that moves in a direction including a component perpendicular to the optical axis when correcting image blur. When the focal length of the first lens group is f1, the focal length of the second lens group is f2, the lateral magnification of the image stabilization unit at the telephoto end is βLNt, and the combined lateral magnification of all lenses positioned on the image side of the image stabilization unit at the telephoto end is βLRt, -6.0<f1 / f2<-1.0 -3.15<(1-βLNt)×βLRt<-1.90 A zoom lens characterized by satisfying the following conditional equation.

17. A zoom lens according to any one of claims 1 to 16, An imaging device characterized by having an image sensor that receives light from the image formed by the zoom lens.

Images