Zoom lens and imaging device

Abstract

To provide a zoom lens that is advantageous in terms of optical performance and compactness.SOLUTION: In a zoom lens having, in order from an object side to an image side, a first lens group at least part of which moves for focusing, a plurality of lens groups that moves in zooming, an aperture stop, and a final lens group that does not move for zooming and has an image forming action, the final lens group has a division element PR that divides incident light into transmitted light and reflected light, a relay part LR that has positive refractive power and on which the transmitted light is incident, and a relay part LA that has positive refractive power and on which the reflected light is incident. When a focal distance at a wide angle end of the zoom lens including the relay part LR is defined as Fw, and the focal distance at the wide angle end of the zoom lens including the relay part LA as FwP, the zoom lens satisfies the condition of 0.50<FwP / Fw<0.80.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Zoom lenses are known that include a splitting element that splits light to branch optical paths, which can be used for additional functions in the zoom lens, such as autofocus.

[0003] Patent Document 1 discloses a zoom lens having the dividing element in a relay lens group that does not move for zooming. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5031475 Summary of the Invention [Problem to be solved by the invention]

[0005] In such a zoom lens, the dividing element can cause a decrease in optical performance and an increase in size. It is an object of the present invention to provide a zoom lens that is advantageous in terms of, for example, optical performance and compactness. [Means for solving the problem]

[0006] One aspect of the present invention is to provide, in order from the object side to the image side, placed , Foca On Sing a first lens group, at least a portion of which moves; When Multiple moving lens groups, aperture stop, and zoom Ming and a final lens group that does not move for the purpose of dividing incident light into transmitted light and reflected light. dividing element and a positive refractive power at which the transmitted light is incident. First relay sectionand a positive refractive power at which the reflected light is incident. The second relay section and Preparation , the splitting element includes an incident surface and a splitting surface that splits light from the incident surface into the transmitted light and the reflected light, the reflected light being reflected by the incident surface and then incident on the second relay unit; The aforementioned First Relay Section The focal length of the zoom lens at the wide-angle end is Fw, Second Relay Section The focal length of the zoom lens at the wide-angle end is defined as FwP. When , 0.50 <FwP / Fw<0.80 become The zoom lens is characterized by satisfying the following conditions. [Effects of the Invention]

[0007] According to the present invention, for example, it is possible to provide a zoom lens that is advantageous in terms of optical performance and compact size. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view of a zoom lens at a wide-angle end according to a first embodiment. [Figure 2] FIG. 10 is a diagram showing aberrations in a straight optical path according to Examples 1 and 4. [Figure 3] FIG. 10 is a diagram showing aberrations in a folded optical path according to the first embodiment. [Figure 4] FIG. 10 is a cross-sectional view of a zoom lens according to a second embodiment at a wide-angle end. [Figure 5] FIG. 10 is a diagram showing aberrations in a straight optical path according to Examples 2 and 5. [Figure 6] FIG. 10 is a diagram showing aberrations in a folded optical path according to the second embodiment. [Figure 7] FIG. 10 is a cross-sectional view of a zoom lens according to a third embodiment at a wide-angle end. [Figure 8] FIG. 10 is a diagram showing aberrations in a straight optical path according to Example 3. [Figure 9] FIG. 10 is a diagram showing aberrations in a folded optical path according to the third embodiment. [Figure 10] FIG. 10 is a cross-sectional view of a zoom lens according to a fourth embodiment at a wide-angle end. [Figure 11] FIG. 10 is a diagram showing aberrations in a folded optical path according to the fourth embodiment. [Figure 12] FIG. 10 is a cross-sectional view of a zoom lens at a wide-angle end according to a fifth embodiment. [Figure 13] FIG. 10 is a diagram showing aberrations in a folded optical path according to the fifth embodiment. [Figure 14] FIG. 1 is a diagram showing an example of the configuration of a zoom lens device; [Figure 15] FIG. 1 is a diagram showing an example of the configuration of an imaging device; DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In principle (unless otherwise specified) throughout the drawings for explaining the embodiments, the same components will be designated by the same reference numerals, and repeated explanations will be omitted.

[0010] [Zoom Lens Embodiment] FIG. 14 is a diagram illustrating an example of the configuration of a zoom lens device. In (A) of the figure, a splitter element PR splits incident light (a light beam) into transmitted light and reflected light, splitting the light path into an optical path in which the light passes through the splitter element and travels straight (a straight optical path) and an optical path in which the light is reflected by the splitter element and travels straight (a folded optical path). In (B) of the figure, the folded optical path is schematically illustrated on a straight line. Each example of this embodiment is a (numerical) example of an optical system including the folded optical path. In the figure, from the object side to the image side, a focusing unit (a first lens group), a magnification unit (multiple lens groups that move during zooming), and an aperture stop SP are arranged. A splitter element PR is arranged closer to the image side than the aperture stop SP. In the folded optical path, an image is formed on an image plane IP via a relay unit LA (also referred to as a lens group LA) after passing through a long optical path PRL within the splitter element PR. The relay unit LA can be enlarged due to the long optical path length PRL.

[0011] This embodiment was created in recognition of the problem of such an increase in size. Here, the focal length at the wide-angle end of the optical system (zoom lens) including the straight optical path in which the relay unit LR is disposed is defined as Fw, and the focal length at the wide-angle end of the optical system including the folded optical path in which the relay unit LA is disposed is defined as FwP. To achieve a compact (small-diameter) relay unit LA and high optical performance of the zoom lens, it is preferable that the following conditions (conditional expressions; inequalities) be satisfied: 0.50 <FwP / Fw<0.80···(1) By satisfying the upper limit of equation (1), a configuration advantageous for a small relay unit LA can be obtained, thereby providing a zoom lens advantageous in terms of compactness. Furthermore, if the lower limit of equation (2) is not satisfied, the refractive power of the relay unit LA will be excessive, resulting in a deterioration in optical performance. It is more preferable that the following condition be satisfied: 0.50 <FwP / Fw<0.75···(1a) It is even more preferable that the following conditions are met: 0.60 <FwP / Fw<0.75···(1b) It is more preferable that the following conditions are met: 0.60 <FwP / Fw<0.70···(1c)

[0012] Here, the relay unit LA preferably includes, from the object side closest to the splitter element PR to the image side, a lens LAG1 having positive refractive power and a cemented lens LAG3A formed by cementing a positive lens and a negative lens. Off-axis light beams entering the relay unit LA become higher as they pass through the long optical path PRL within the splitter element PR. Therefore, the placement of the positive lens LAG1 allows the lens groups behind it to be made smaller. Furthermore, the placement of the cemented lens LAG3A can reduce the chromatic aberrations that result from this.

[0013] Furthermore, it is preferable that a lens group having positive refractive power is disposed adjacent to the object side of the aperture stop SP, and that this lens group moves toward the object side during zooming from the wide-angle end to the telephoto end. This configuration is advantageous for constructing a zoom lens with a high zoom ratio.

[0014] Furthermore, it is preferable that the following condition be satisfied, where the Abbe number of the positive lens included in the cemented lens LAG3A is νLAG2 and the Abbe number of the negative lens included in the cemented lens LAG3A is νLAG3. 30<νLAG2-νLAG3<80 (2) If the condition regarding the lower limit of the expression (3) is not satisfied, the chromatic aberration occurring in the first lens LAG1 will be undercorrected, and if the condition regarding the upper limit of the expression (3) is not satisfied, the correction will be excessive. It is more preferable that the following conditions are met: 33<νLAG2-νLAG3<80···(2a) It is even more preferable that the following conditions are met: 35<νLAG2-νLAG3<75···(2b)

[0015] Furthermore, it is preferable that the splitting element PR has an incident surface and a splitting surface that splits the light incident from the incident surface into the reflected light and the transmitted light, and that the reflected light from the splitting surface is reflected (e.g., totally reflected) by the incident surface and emitted from the splitting element PR. With this configuration, the overall length of the optical system including the relay unit LR is shortened, thereby providing a zoom lens that is advantageous in terms of compactness. Furthermore, it is preferable that the following condition be satisfied, where L is the distance from the aperture stop SP to the image plane IP (the image plane of the zoom lens through the relay unit LA) and PRL is the optical path length of the splitting element PR in the folded optical path (the optical path of the zoom lens via the relay unit LA). 0.35 <PRL / L<0.60···(3) If the condition for the lower limit of equation (3) is not met, the optical path length of the splitter element PR in the straight optical path will be long, resulting in an excessively long overall length of the zoom lens. If the condition for the upper limit of equation (3) is not met, the optical path length of the splitter element PR in the folded optical path will be long, resulting in an excessively large diameter of the relay section LA. It is more preferable that the following condition be satisfied: 0.38 <PRL / L<0.55···(3a) It is even more preferable that the following conditions are met: 0.41 <PRL / L<0.52···(3b)

[0016] In the zoom lens according to this embodiment, it is preferable that the relay unit LA has a lens LAG1 having positive refractive power arranged closest to the object, and a lens LAGN. It is also preferable that the following condition be satisfied, where fLA is the focal length of the relay unit LA and φLAG1R1 is the refractive power of the object-side surface LAG1R1 of the lens LAG1: 0.20<(fLA×φLAG1R1) -1 <1.00···(4) If the lower limit of equation (4) is not satisfied, the aberrations (e.g., spherical aberration and axial chromatic aberration) occurring at surface G1R1 will be excessive, which will be detrimental to achieving a zoom lens with high optical performance. If the upper limit of equation (4) is not satisfied, the effective diameter from surface G1R1 onwards will be excessively large, which will be detrimental to achieving a compact zoom lens. It is more preferable that the following condition be satisfied: 0.35<(fLA×φLAG1R1) -1 <0.80 (4a) It is even more preferable that the following conditions are met: 0.50<(fLA×φLAG1R1) -1 <0.60 (4b)

[0017] [Embodiment Related to Imaging Apparatus] FIG. 15 is a diagram showing an example of the configuration of an imaging device. In the diagram, 101 is a zoom lens according to any one of Examples 1 to 5. 124 is a camera (imaging device) body. The zoom lens 101 is detachable from the camera body 124. 125 is an imaging device configured by attaching the zoom lens 101 to the camera body 124. The zoom lens 101 includes a first lens group F, two or more lens groups LZ that move during zooming (variable magnification), and a final lens group R. At least a portion of the first lens group F moves on the optical axis for focusing. The first lens group F includes, but is not limited to, a second subgroup 1b that moves on the optical axis for focusing, and a first subgroup 1a and a third subgroup 1c that do not move for focusing.

[0018] Two or more lens groups LZ for zooming move along the optical axis during zooming. SP is an aperture stop. The final lens group R may have a subgroup that can be inserted into or removed from the optical path. The focal length range of the zoom lens 101 can be changed by inserting or removing the subgroup. 114 and 115 are drive mechanisms for driving the second subgroup 1b and the two or more lens groups for zooming along the optical axis, respectively. The drive mechanisms may include a helicoid, a cam, or the like. 116 to 118 are motors (drive units) for driving the drive mechanisms 114 and 115 and the aperture stop SP, respectively. 119 to 121 are detectors for detecting the position of the second subgroup 1b on the optical axis, the position of the two or more lens groups for zooming on the optical axis, and the aperture diameter of the aperture stop SP, respectively. The detectors may include an encoder, potentiometer, photosensor, or the like. In the camera body 124, 109 is a glass block including an optical filter and the like, and 110 is an imaging element (photoelectric conversion element) that captures a subject image formed by the zoom lens 101. The imaging element can be configured to include a CCD or CMOS sensor. Also, 111 and 122 are CPUs serving as processing units (control units) in the camera body 124 and the zoom lens 101, respectively. In this way, by attaching the zoom lens according to the previous embodiment to the camera body, it is possible to provide a useful imaging device including the zoom lens that has the advantageous effects described above.

[0019] Example 1 Here, a zoom lens according to (Numerical) Example 1 will be described with reference to FIGS. 1 to 3. FIG. 1 is a diagram showing a cross section of the zoom lens according to Example 1 at the wide-angle end. FIG. 2 is a diagram showing aberrations in a straight optical path at (A) the wide-angle end, (B) the intermediate position, and (C) the telephoto end. FIG. 3 is a diagram showing aberrations in a folded optical path at (A) the wide-angle end, (B) the intermediate position, and (C) the telephoto end. FIG. 1A shows a cross section of a zoom lens including a straight optical path. FIG. 1A also shows the trajectories of multiple lens groups that move during zooming, and the trajectories (movement directions) of sub-lens groups (the sub-lens group including surfaces 7-10 and the sub-lens group including surfaces 11-12) that move during focusing. FIG. 1B is a schematic diagram showing a cross section of a zoom lens including a folded optical path. The zoom lens of Example 1 includes, in order from the object side to the image side, a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L3 with positive refractive power, a fourth lens group L4 with positive refractive power, an aperture stop SP, and fifth (final) lens groups L5' and L5 with positive refractive power. An imaging surface of an imaging unit such as an image sensor may be arranged on image plane IP'. A light receiving unit (AF sensor) for adding an AF (autofocus) function to the zoom lens is arranged on image plane IP. Note that instead of or in addition to the light receiving unit, a light receiving unit for adding a function other than the AF function (e.g., a photometry function, an imaging function using multiple wavelength bands, etc.) to the zoom lens may be arranged on image plane IP.

[0020] During zooming from the wide-angle end to the telephoto end, the first lens unit L1 and the final lens units L5' and L5 do not move, the second lens unit L2 moves toward the image side, and the third lens unit L3 and the fourth lens unit L4 move. The final lens unit L5' includes, from the object side to the image side, a prism PR as a splitting element that splits light into transmitted light and reflected light to branch the optical path, and a relay unit LR that has positive refractive power and an imaging function. The final lens unit L5 includes, from the object side to the image side, a prism PR and a relay unit LA that has positive refractive power and an imaging function.

[0021] 2 and 3 will now be described. In the spherical aberration diagrams, the solid line indicates spherical aberration at the e-line (wavelength 594.6 nm), and the two-dot chain line indicates spherical aberration at the g-line (wavelength 435.8 nm). In the astigmatism diagrams, the solid line S indicates astigmatism in the sagittal section, and the dashed line M indicates astigmatism in the meridional section. The distortion diagrams show those at the e-line. The chromatic aberration diagrams show lateral chromatic aberration at the g-line. In these diagrams, Fno represents the F-number, and ω represents the half angle of view (°). The explanations of the aberration diagrams here are similar to those for other embodiments.

[0022] Example 2 Here, a zoom lens according to (Numerical) Example 2 will be described with reference to FIGS. 4 to 6. FIG. 4 is a diagram showing a cross section of the zoom lens according to Example 2 at the wide-angle end. FIG. 5 is a diagram showing aberrations in a straight optical path at (A) the wide-angle end, (B) the intermediate position, and (C) the telephoto end. FIG. 6 is a diagram showing aberrations in a folded optical path at (A) the wide-angle end, (B) the intermediate position, and (C) the telephoto end. FIG. 4A shows a cross section of a zoom lens including a straight optical path. FIG. 4A also shows the trajectories of multiple lens groups that move during zooming and the trajectory (movement direction) of a sub-lens group (a sub-lens group including surfaces 7-11) that moves during focusing. FIG. 4B is a schematic diagram showing a cross section of a zoom lens including a folded optical path. The zoom lens of Example 2 has, in order from the object side to the image side, a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L3 with positive refractive power, an aperture stop SP, and fourth (final) lens groups L4' and L4 with positive refractive power. An imaging surface of an imaging unit such as an image sensor may be arranged on image plane IP'. A light receiving unit (sensor) for adding an AF function to the zoom lens is arranged on image plane IP. Note that instead of or in addition to the light receiving unit, a light receiving unit for adding the above-mentioned functions other than the AF function to the zoom lens may be arranged on image plane IP.

[0023] During zooming from the wide-angle end to the telephoto end, the first lens unit L1 and the final lens units L4' and L4 do not move, the second lens unit L2 moves toward the image side, and the third lens unit L3 moves. The final lens unit L4' includes, from the object side to the image side, a prism PR as a splitting element that splits light into transmitted light and reflected light to branch the optical path, and a relay unit LR that has positive refractive power and an imaging function. The final lens unit L4 includes, from the object side to the image side, a prism PR and a relay unit LA that has positive refractive power and an imaging function.

[0024] Example 3 Here, a zoom lens according to (Numerical) Example 3 will be described with reference to FIGS. 7 to 9. FIG. 7 is a diagram showing a cross section of the zoom lens according to Example 3 at the wide-angle end. FIG. 8 is a diagram showing aberrations in a straight optical path at (A) the wide-angle end, (B) the intermediate position, and (C) the telephoto end. FIG. 9 is a diagram showing aberrations in a folded optical path at (A) the wide-angle end, (B) the intermediate position, and (C) the telephoto end. (A) of FIG. 7 shows a cross section of a zoom lens including a straight optical path. (A) also shows the trajectories of multiple lens groups that move during zooming and the trajectory (movement direction) of the sub-lens group (the sub-lens group including surfaces 8-11) that moves during focusing. (B) of FIG. 7 schematically shows a cross section of a zoom lens including a folded optical path. The zoom lens of Example 3 has, in order from the object side to the image side, a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L3 with negative refractive power, a fourth lens group L4 with positive refractive power, an aperture stop SP, and fifth (final) lens groups L5' and L5 with positive refractive power. An imaging surface of an imaging unit such as an image sensor may be arranged on image plane IP'. A light receiving unit (sensor) for adding an AF function to the zoom lens is arranged on image plane IP. Note that instead of or in addition to the light receiving unit, a light receiving unit for adding the above-mentioned functions other than the AF function to the zoom lens may be arranged on image plane IP.

[0025] During zooming from the wide-angle end to the telephoto end, the first lens unit L1 and the final lens units L5' and L5 do not move, the second lens unit L2 moves toward the image side, and the third lens unit L3 and the fourth lens unit L4 move. The final lens unit L5' includes, from the object side to the image side, a prism PR as a splitting element that splits light into transmitted light and reflected light to branch the optical path, and a relay unit LR that has positive refractive power and an imaging function. The final lens unit L5 includes, from the object side to the image side, a prism PR and a relay unit LA that has positive refractive power and an imaging function.

[0026] Example 4 A zoom lens according to a fourth (numerical) embodiment will now be described with reference to FIGS. 10 and 11. FIG. 10 is a diagram illustrating a cross section of the zoom lens according to the fourth embodiment at the wide-angle end. FIG. 11 is a diagram illustrating aberrations in a folded optical path at (A) the wide-angle end, (B) the intermediate position, and (C) the telephoto end. Note that FIG. 2 also illustrates aberrations in a straight optical path at (A) the wide-angle end, (B) the intermediate position, and (C) the telephoto end according to this embodiment. FIG. 10(A) illustrates a cross section of a zoom lens including a straight optical path. FIG. 10(A) also illustrates the trajectories of multiple lens groups that move during zooming and the trajectories (movement directions) of sub-lens groups (the sub-lens group including surfaces 7-10 and the sub-lens group including surfaces 11-12) that move during focusing. FIG. 10(B) schematically illustrates a cross section of a zoom lens including a folded optical path. The zoom lens of Example 4 includes, in order from the object side to the image side, a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L3 with positive refractive power, a fourth lens group L4 with positive refractive power, an aperture stop SP, and a fifth (final) lens group L5'-L5 with positive refractive power. An imaging surface of an imaging unit such as an image sensor may be disposed on image plane IP'. A light-receiving unit (autofocus sensor) for adding an AF function to the zoom lens is disposed on image plane IP (the image plane of the zoom lens formed by relay unit LA). The sensor may be, but is not limited to, a so-called phase difference detection sensor. Instead of or in addition to the light-receiving unit, a light-receiving unit for adding the above-mentioned functions other than the AF function to the zoom lens may be disposed on image plane IP.

[0027] During zooming from the wide-angle end to the telephoto end, the first lens unit L1 and the final lens units L5' and L5 do not move, the second lens unit L2 moves toward the image side, and the third lens unit L3 and the fourth lens unit L4 move. The final lens unit L5' includes, from the object side to the image side, a prism PR as a splitting element that splits light into transmitted light and reflected light to branch the optical path, and a relay unit LR that has positive refractive power and an imaging function. The final lens unit L5 includes, from the object side to the image side, a prism PR and a relay unit LA that has positive refractive power and an imaging function.

[0028] Example 5 Here, a zoom lens according to (numerical) Example 5 will be described with reference to FIGS. 12 and 13. FIG. 12 is a diagram showing a cross section of the zoom lens according to Example 5 at the wide-angle end. FIG. 13 is a diagram showing aberrations in a folded optical path at (A) the wide-angle end, (B) the intermediate position, and (C) the telephoto end. Note that FIG. 5 is also a diagram showing aberrations in a straight optical path at (A) the wide-angle end, (B) the intermediate position, and (C) the telephoto end according to this example. FIG. 12(A) shows a cross section of a zoom lens including a straight optical path. FIG. 12(A) also shows the trajectories of multiple lens groups that move during zooming and the trajectory (movement direction) of the sub-lens group (the sub-lens group including surfaces 7-11) that moves during focusing. FIG. 12(B) schematically shows a cross section of a zoom lens including a folded optical path. The zoom lens of Example 5 has, in order from the object side to the image side, a first lens unit L1 with positive refractive power, a second lens unit L2 with negative refractive power, a third lens unit L3 with positive refractive power, an aperture stop SP, and fourth (final) lens units L4' and L4 with positive refractive power. An imaging surface of an imaging unit such as an image sensor may be arranged on image plane IP'. A light receiving unit (sensor) for adding an AF function to the zoom lens is arranged on image plane IP. Note that instead of or in addition to the light receiving unit, a light receiving unit for adding the above-mentioned functions other than the AF function to the zoom lens may be arranged on image plane IP.

[0029] During zooming from the wide-angle end to the telephoto end, the first lens unit L1 and the final lens units L4' and L4 do not move, the second lens unit L2 moves toward the image side, and the third lens unit L3 moves. The final lens unit L4' includes, from the object side to the image side, a prism PR as a splitting element that splits light into transmitted light and reflected light to branch the optical path, and a relay unit LR that has positive refractive power and an imaging function. The final lens unit L4 includes, from the object side to the image side, a prism PR and a relay unit LA that has positive refractive power and an imaging function.

[0030] Numerical Examples 1 to 5 corresponding to the above-described Examples 1 to 5 are shown below. In each numerical example, r is the radius of curvature (mm) of the surface with the surface number (i-th), and d is the distance (lens thickness or air thickness; mm) between the i-th surface and the (i+1)-th surface. The (variable) in d indicates that the air thickness changes during zooming, and the correspondence between the air thickness and the focal length is shown in a separate table. nd is the refractive index of the material of the i-th optical element with respect to the d-line. νd is the Abbe number of the material of the i-th optical element with respect to the d-line. The Abbe number νd is defined by the following equation: νd=(nd-1) / (nF-nC) (A) Here, nF, nd, and nC are refractive indices for the F line (wavelength 486.1 nm), d line (wavelength 587.6 nm), and C line (wavelength 656.3 nm) of the Fraunhofer lines.

[0031] In each numerical example, the half angle of view (°) of the zoom lens is shown, and the maximum image height corresponding to that half angle of view is shown as "image height." The focal length of each lens group is also shown as lens group data. The back focus (mm) is also shown as "BF." The back focus is the distance on the optical axis from the image-side surface of the lens closest to the image (the final surface of the zoom lens) that has refractive power in the zoom lens to the paraxial image plane, expressed as an air-equivalent length. The "total lens length" is also shown. The total lens length is the distance on the optical axis from the front surface of the zoom lens (the object-side surface of the lens closest to the object) to the final surface of the zoom lens, plus the back focus.

[0032] Furthermore, an "*" next to a surface number indicates that the surface with that surface number is aspherical. The height of a point on the aspherical surface on an axis perpendicular to the optical axis is defined as H, and the direction of light travel on the optical axis is defined as positive. Furthermore, R is the paraxial radius of curvature of the aspherical surface, K is the conic constant, and A2 to A16 are aspherical coefficients. Then, the amount of deviation X from the reference spherical surface of the point at height H on an axis parallel to the optical axis is expressed by the following equation:

[0033]

number

[0034] In the conic constants and aspherical coefficients of each numerical example, e±X is × 10 ±X The focal length in each numerical example is the focal length for the e-line (wavelength 546.07 nm). The values ​​of the above-mentioned conditional expressions (1) to (4) in each numerical example are shown in Table 1.

[0035] [Numerical Example 1] <Optical system including a straight optical path> Unit: mm Surface Data Surface number rd nd vd 1 -2942.188 6.00 1.83481 42.7 2 335.459 1.80 3 335.066 23.71 1.43387 95.1 4 -1057.929 0.20 5 525.299 14.68 1.43387 95.1 6 -2449.905 25.25 7 377.042 20.53 1.43387 95.1 8 -1365.497 0.25 9 306.954 16.16 1.43387 95.1 10 1716.232 1.50 11 188.244 16.19 1.43875 94.7 12 408.078 (variable) 13* -532.824 2.20 2.00330 28.3 14 38.132 11.72 15 -44.546 1.45 1.74320 49.3 16 72.565 9.77 1.89286 20.4 17 -46.484 1.63 18 -41.758 2.00 1.88300 40.8 19 -152.608 (variable) 20 152.336 11.49 1.72916 54.7 21* -265.715 6.62 22 139.888 13.50 1.43875 94.7 23 -246.304 0.50 24 264.094 2.60 1.85478 24.8 25 97.106 (variable) 26 86.506 15.39 1.49700 81.5 27 -236.969 0.50 28 415.877 2.50 1.80518 25.4 29 139.362 7.85 1.60311 60.6 30* -764.201 (variable) 31 (Aperture) ∞ 5.46 32 -100.588 1.40 1.88300 40.8 33 50.285 1.36 34 40.817 3.60 1.92286 18.9 35 96.042 4.19 36 -79.866 1.70 1.80400 46.5 37 -114.439 5.00 38 ∞ 17.45 1.83481 42.7 39∞1.50 40 471.053 2.00 2.00100 29.1 41 61.204 5.25 42 -154.723 1.50 1.88300 40.8 43 48.981 6.45 1.84666 23.8 44 -66.247 0.20 45 -246.690 9.17 1.43875 94.7 46 -32.301 0.20 47 -62.829 8.38 1.81600 46.6 48 -21.384 1.50 2.00100 29.1 49 -126.267 8.68 50 -1310.821 1.40 1.83481 42.7 51 36.358 7.90 1.80518 25.4 52 -196.957 0.28 53 146.796 7.95 1.48749 70.2 54 -38.232 1.62 2.00100 29.1 55 -82.855 0.99 56 -132.295 5.94 1.60562 43.7 57 -40.442 0.22 58 109.076 6.96 1.64000 60.1 59 -47.080 1.62 2.00100 29.1 60 -140.064 9.82 61 ∞ 33.00 1.60859 46.4 62 ∞ 13.20 1.51633 64.2 63 ∞ (variable) Image plane ∞ Aspheric data Page 13 K = 1.99852e+000 A 4= 1.15677e-006 A 6=-2.75064e-008 A 8=-3.06848e-010 A10= 9.10515e-013 A12= 3.28486e-015 A14= 1.35261e-018 A16= 5.54400e-022 A 3= 2.74335e-007 A 5= 9.95673e-008 A 7= 4.02226e-009 A 9= 6.12079e-012 A11=-8.52506e-014 A13=-6.85632e-017 A15=-3.84859e-020 Page 21 K = 1.21093e+001 A 4= 2.82183e-007 A 6=-5.59441e-011 A 8=-2.00796e-014 A10= 9.78964e-017 A12=-6.30815e-020 A14= 1.70834e-023 A16=-4.73901e-027 A 3=-2.90901e-008 A 5= 1.58196e-009 A 7= 1.10620e-012 A 9=-1.50730e-015 A11= 5.86871e-020 A13= 1.04584e-022 A15= 1.44467e-025 Page 30 K =-2.23400e+002 A 4= 2.77687e-007 A 6= 4.69555e-010 A 8= 1.39733e-013 A10=-2.98156e-016 A12= 4.58582e-019 A14=-2.25443e-022 A16= 5.80568e-026 A 3= 1.70768e-007 A 5=-5.73181e-009 A 7=-1.36230e-011 A 9= 7.92918e-015 A11=-8.14405e-018 A13= 2.06016e-021 A15=-8.57551e-025 Various data Zoom ratio 120.00 Wide-angle Mid-range Telephoto Focal length 8.50 100.01 1020.12 F-number 1.75 1.75 5.25 Angle of view 32.90 3.15 0.31 Image height 5.50 5.50 5.50 Lens total length 687.65 687.65 687.65 BF 51.79 51.79 51.79 d12 3.47 154.53 194.08 d19 289.33 96.92 2.00 d25 4.21 10.30 4.50 d30 2.99 38.24 99.42 d63 12.80 12.80 12.80 Zoom lens group data Group starting plane focal length 1 1 251.50 2 13 -24.07 3 20 134.62 4 26 112.37 5 31 35.15 <Optical system including folded optical path (after the splitter element PR)> Unit: mm Surface Data Surface number rd nd vd 38 ∞ 40.88 1.83481 42.7 39 ∞ 1.47 40 10.377 5.59 1.49700 81.5 41 -1045.456 0.20 42 9.920 4.80 1.49700 81.5 43 -15.113 1.50 1.95375 32.3 44 6.432 3.02 45 15.953 5.24 1.85025 30.1 46 -5.936 0.70 1.81600 46.6 47 109.674 (variable) Image plane ∞ Various data Wide-angle Mid-range Telephoto Focal length 5.51 64.85 661.44 F-number 3.80 3.80 3.79 Angle of view 32.97 3.16 0.31 Image height 3.58 3.58 3.58 Lens total length 609.84 609.84 609.84 BF 7.73 7.73 7.73 d12 3.47 154.53 194.08 d19 289.33 96.92 2.00 d25 4.21 10.30 4.50 d30 2.99 38.24 99.42 d47 7.73 7.73 7.73 Zoom lens group data Group starting plane focal length 5 31 47.42

[0036] [Numerical Example 2] <Optical system including a straight optical path> Unit: mm Surface Data Surface number rd nd vd 1 335.346 4.70 1.77250 49.6 2 100.786 37.33 3 -190.279 4.50 1.77250 49.6 4 3222.942 0.15 5 251.152 10.21 1.71736 29.5 6 1141.804 7.82 7 -1097.861 15.33 1.49700 81.5 8 -157.636 0.20 9 16423.763 4.40 1.80518 25.4 10 240.582 13.15 1.49700 81.5 11 -568.448 37.36 12 564.340 17.16 1.43387 95.1 13 -171.752 0.15 14 195.384 12.55 1.43387 95.1 15 -2522.933 0.15 16 126.181 8.98 1.61800 63.3 17 227.998 (variable) 18 84.740 1.50 1.88300 40.8 19 47.202 6.00 20 -175.088 1.50 1.77250 49.6 21 125.630 5.65 22 -52.258 1.50 1.77250 49.6 23 1040.028 8.71 1.80810 22.8 24 -38.455 0.66 25 -36.242 1.50 1.81600 46.6 26 -249.875 (variable) 27 -758.136 5.45 1.61800 63.3 28* -99.462 0.20 29 355.782 2.50 1.72047 34.7 30 65.376 11.59 1.61800 63.3 31 -144.731 0.20 32 213.940 9.07 1.60311 60.6 33 -87.683 2.50 1.84666 23.9 34 -280.740 0.20 35 128.221 8.81 1.62041 60.3 36 -137.702 (variable) 37 (Aperture) ∞ 3.32 38 -58.030 1.50 1.60300 65.4 39 27.203 3.07 1.72047 34.7 40 47.944 6.04 41 ∞ 17.45 1.83481 42.7 42∞5.41 43 -44.210 1.20 1.81600 46.6 44 35.063 10.43 1.72825 28.5 45 -32.800 0.15 46 -51.153 6.32 1.83481 42.7 47 137.443 0.15 48 56.922 13.40 1.71736 29.5 49 -157.402 5.09 50 -4938.972 4.00 1.75500 52.3 51 41.983 10.15 1.51823 58.9 52 -68.541 0.15 53 -1378.843 11.20 1.51633 64.1 54 -25.522 1.40 1.85025 30.1 55 -105.630 0.15 56 657.299 8.05 1.51633 64.1 57 -36.928 0.99 58 50.711 8.39 1.53996 59.5 59 -55.709 1.42 1.84666 23.9 60 -706.357 5.00 61 ∞ 33.00 1.60859 46.4 62 ∞ 13.20 1.51633 64.2 63 ∞ (variable) Image plane ∞ Aspheric data Page 28 K = 0.00000e+000 A 4= 2.32112e-007 A 6= 2.35378e-010 A 8=-2.98860e-013 A10= 1.74212e-016 Various data Zoom ratio 18.50 Wide-angle Mid-range Telephoto Focal length 7.20 31.29 133.17 F-number 1.54 1.54 1.85 Angle of view 37.38 9.97 2.36 Image height 5.50 5.50 5.50 Lens length 565.91 565.91 565.91 BF 47.07 47.07 47.07 d17 5.08 79.08 112.22 d26 150.47 62.77 4.53 d36 2.15 15.84 40.95 d63 12.90 12.90 12.90 Zoom lens group data Group starting plane focal length 1 1 113.04 2 18 -29.50 3 27 49.00 4 37 30.04 <Optical system including folded optical path (after the splitter element PR)> Unit: mm Surface Data Surface number rd nd vd 41 ∞ 40.88 1.83481 42.7 42 ∞ 1.47 43 10.154 4.19 1.63980 34.5 44 61.568 0.20 45 9.214 4.35 1.43875 94.7 46 -28.583 1.50 2.00100 29.1 47 6.397 2.04 48 11.022 5.32 1.64000 60.1 49 -6.337 0.70 1.95375 32.3 50 -19.947 (variable) Image plane ∞ Wide-angle Mid-range Telephoto Focal length 4.88 21.19 90.19 F-number 3.80 3.80 3.80 Angle of view 36.25 9.58 2.27 Image height 3.58 3.58 3.58 Lens total length 483.57 483.57 483.57 BF 9.61 9.61 9.61 d17 5.08 79.08 112.22 d26 150.47 62.77 4.53 d36 2.15 15.84 40.95 d50 9.61 9.61 9.61 Zoom lens group data Group starting plane focal length 4 37 38.17

[0037] [Numerical Example 3] <Optical system including a straight optical path> Unit: mm Surface Data Surface number rd nd vd 1 -190.007 2.30 1.72047 34.7 2 156.768 4.87 3 694.892 2.20 1.84666 23.8 4 275.524 8.70 1.43875 94.9 5 -179.515 0.40 6 166.357 10.90 1.43387 95.1 7 -137.515 7.02 8 130.075 7.65 1.59240 68.3 9 -477.969 0.15 10 62.052 6.20 1.72916 54.7 11 125.670 (variable) 12 65.339 1.00 1.88300 40.8 13 14.550 6.16 14 -44.448 6.77 1.80810 22.8 15 -12.423 0.75 1.88300 40.8 16 88.606 0.18 17 30.523 2.44 1.66680 33.0 18 92.262 (variable) 19 -37.712 0.75 1.75700 47.8 20 67.757 2.32 1.84649 23.9 21 -717.839 (variable) 22 93.745 4.84 1.64000 60.1 23* -45.035 (variable) 24 (Aperture) ∞ 2.00 25 56.188 6.38 1.51742 52.4 26 -36.997 1.00 1.83400 37.2 27 -181.518 3.00 28 ∞ 17.45 1.83481 42.7 29∞17.27 30 -50.475 3.08 1.59551 39.2 31 -31.933 0.14 32 -153.829 0.80 1.80100 35.0 33 36.989 5.20 1.51823 58.9 34 -76.826 0.15 35 100.830 6.31 1.48749 70.2 36 -24.223 0.85 1.88300 40.8 37 -69.487 0.22 38 55.839 4.17 1.51633 64.1 39 -68.775 4.50 40 ∞ 33.00 1.60859 46.4 41 ∞ 13.20 1.51633 64.1 42 ∞ (variable) Image plane ∞ Aspheric data Page 23 K =-6.95534e-001 A 4= 1.29096e-006 A 6= 3.74923e-010 A 8= 5.46374e-012 A10=-1.71339e-014 A12= 9.53627e-018 Various data Zoom ratio 21.81 Wide-angle Mid-range Telephoto Focal length 7.80 25.80 170.11 F-number 1.80 1.80 2.68 Angle of view 35.19 12.03 1.85 Image height 5.50 5.50 5.50 Lens total length 255.00 255.00 255.00 BF 40.62 40.62 40.62 d11 0.39 33.23 55.49 d18 60.06 13.48 11.78 d21 6.57 15.95 1.42 d23 3.75 8.10 2.06 d42 6.95 6.95 6.95 Zoom lens group data Group starting plane focal length 1 1 71.50 2 12 -13.80 3 19 -57.00 4 22 48.00 5 24 51.04 <Optical system including folded optical path (after the splitter element PR)> Unit: mm Surface Data Surface number rd nd vd 28 ∞ 40.88 1.83481 42.7 29 ∞ 0.78 30 10.673 5.07 1.49700 81.5 31 -70.351 0.20 32 9.488 4.24 1.49700 81.5 33 -15.585 2.00 1.95375 32.3 34 6.711 4.85 35 28.666 4.04 1.85025 30.1 36 -6.467 0.70 1.81600 46.6 37 -93.291 (variable) Image plane ∞ Wide-angle Mid-range Telephoto Focal length 5.07 16.77 110.57 F-number 3.80 3.80 3.79 Angle of view 35.19 12.03 1.85 Image height 3.58 3.58 3.58 Lens total length 229.35 229.35 229.35 BF 7.85 7.85 7.85 d11 0.39 33.23 55.49 d18 60.06 13.48 11.78 d21 6.57 15.95 1.42 d23 3.75 8.10 2.06 d37 7.85 7.85 7.85 Zoom lens group data Group starting plane focal length 5 24 32.97

[0038] [Numerical Example 4] <Optical system including a straight optical path> Unit: mm Surface Data Surface number rd nd vd 1 -2942.188 6.00 1.83481 42.7 2 335.459 1.80 3 335.066 23.71 1.43387 95.1 4 -1057.929 0.20 5 525.299 14.68 1.43387 95.1 6 -2449.905 25.25 7 377.042 20.53 1.43387 95.1 8 -1365.497 0.25 9 306.954 16.16 1.43387 95.1 10 1716.232 1.50 11 188.244 16.19 1.43875 94.7 12 408.078 (variable) 13* -532.824 2.20 2.00330 28.3 14 38.132 11.72 15 -44.546 1.45 1.74320 49.3 16 72.565 9.77 1.89286 20.4 17 -46.484 1.63 18 -41.758 2.00 1.88300 40.8 19 -152.608 (variable) 20 152.336 11.49 1.72916 54.7 21* -265.715 6.62 22 139.888 13.50 1.43875 94.7 23 -246.304 0.50 24 264.094 2.60 1.85478 24.8 25 97.106 (variable) 26 86.506 15.39 1.49700 81.5 27 -236.969 0.50 28 415.877 2.50 1.80518 25.4 29 139.362 7.85 1.60311 60.6 30* -764.201 (variable) 31 (Aperture) ∞ 5.46 32 -100.588 1.40 1.88300 40.8 33 50.285 1.36 34 40.817 3.60 1.92286 18.9 35 96.042 4.19 36 -79.866 1.70 1.80400 46.5 37 -114.439 5.00 38 ∞ 17.45 1.83481 42.7 39∞1.50 40 471.053 2.00 2.00100 29.1 41 61.204 5.25 42 -154.723 1.50 1.88300 40.8 43 48.981 6.45 1.84666 23.8 44 -66.247 0.20 45 -246.690 9.17 1.43875 94.7 46 -32.301 0.20 47 -62.829 8.38 1.81600 46.6 48 -21.384 1.50 2.00100 29.1 49 -126.267 8.68 50 -1310.821 1.40 1.83481 42.7 51 36.358 7.90 1.80518 25.4 52 -196.957 0.28 53 146.796 7.95 1.48749 70.2 54 -38.232 1.62 2.00100 29.1 55 -82.855 0.99 56 -132.295 5.94 1.60562 43.7 57 -40.442 0.22 58 109.076 6.96 1.64000 60.1 59 -47.080 1.62 2.00100 29.1 60 -140.064 9.82 61 ∞ 33.00 1.60859 46.4 62 ∞ 13.20 1.51633 64.2 63 ∞ (variable) Image plane ∞ Aspheric data Page 13 K = 1.99852e+000 A 4= 1.15677e-006 A 6=-2.75064e-008 A 8=-3.06848e-010 A10= 9.10515e-013 A12= 3.28486e-015 A14= 1.35261e-018 A16= 5.54400e-022 A 3= 2.74335e-007 A 5= 9.95673e-008 A 7= 4.02226e-009 A 9= 6.12079e-012 A11=-8.52506e-014 A13=-6.85632e-017 A15=-3.84859e-020 Page 21 K = 1.21093e+001 A 4= 2.82183e-007 A 6=-5.59441e-011 A 8=-2.00796e-014 A10= 9.78964e-017 A12=-6.30815e-020 A14= 1.70834e-023 A16=-4.73901e-027 A 3=-2.90901e-008 A 5= 1.58196e-009 A 7= 1.10620e-012 A 9=-1.50730e-015 A11= 5.86871e-020 A13= 1.04584e-022 A15= 1.44467e-025 Page 30 K =-2.23400e+002 A 4= 2.77687e-007 A 6= 4.69555e-010 A 8= 1.39733e-013 A10=-2.98156e-016 A12= 4.58582e-019 A14=-2.25443e-022 A16= 5.80568e-026 A 3= 1.70768e-007 A 5=-5.73181e-009 A 7=-1.36230e-011 A 9= 7.92918e-015 A11=-8.14405e-018 A13= 2.06016e-021 A15=-8.57551e-025 Various data Zoom ratio 120.00 Wide-angle Mid-range Telephoto Focal length 8.50 100.01 1020.12 F-number 1.75 1.75 5.25 Angle of view 32.90 3.15 0.31 Image height 5.50 5.50 5.50 Lens total length 687.65 687.65 687.65 BF 51.79 51.79 51.79 d12 3.47 154.53 194.08 d19 289.33 96.92 2.00 d25 4.21 10.30 4.50 d30 2.99 38.24 99.42 d63 12.80 12.80 12.80 Zoom lens group data Group starting plane focal length 1 1 251.50 2 13 -24.07 3 20 134.62 4 26 112.37 5 31 35.15 <Optical system including folded optical path (after the splitter element PR)> Unit: mm Surface Data Surface number rd nd vd 38 ∞ 38.00 1.83481 42.7 39 ∞ 1.47 40 10.880 4.64 1.49700 81.5 41 -170.491 0.20 42 9.304 5.36 1.48749 70.2 43 -16.117 1.50 1.90525 35.0 44 5.984 7.99 45 15.392 5.08 1.85025 30.1 46 -7.155 0.70 1.81600 46.6 47 38.476 (variable) Image plane ∞ Wide-angle Mid-range Telephoto Focal length 5.77 67.84 691.97 F-number 3.80 3.80 3.80 Angle of view 33.73 3.25 0.32 Image height 3.85 3.85 3.85 Lens total length 607.49 607.49 607.49 BF 3.85 3.85 3.85 d12 3.47 154.53 194.08 d19 289.33 96.92 2.00 d25 4.21 10.30 4.50 d30 2.99 38.24 99.42 d47 3.85 3.85 3.85 Zoom lens group data Group starting plane focal length 5 31 43.38

[0039] Numerical Example 5 <Optical system including a straight optical path> Unit: mm Surface Data Surface number rd nd vd 1 335.346 4.70 1.77250 49.6 2 100.786 37.33 3 -190.279 4.50 1.77250 49.6 4 3222.942 0.15 5 251.152 10.21 1.71736 29.5 6 1141.804 7.82 7 -1097.861 15.33 1.49700 81.5 8 -157.636 0.20 9 16423.763 4.40 1.80518 25.4 10 240.582 13.15 1.49700 81.5 11 -568.448 37.36 12 564.340 17.16 1.43387 95.1 13 -171.752 0.15 14 195.384 12.55 1.43387 95.1 15 -2522.933 0.15 16 126.181 8.98 1.61800 63.3 17 227.998 (variable) 18 84.740 1.50 1.88300 40.8 19 47.202 6.00 20 -175.088 1.50 1.77250 49.6 21 125.630 5.65 22 -52.258 1.50 1.77250 49.6 23 1040.028 8.71 1.80810 22.8 24 -38.455 0.66 25 -36.242 1.50 1.81600 46.6 26 -249.875 (variable) 27 -758.136 5.45 1.61800 63.3 28* -99.462 0.20 29 355.782 2.50 1.72047 34.7 30 65.376 11.59 1.61800 63.3 31 -144.731 0.20 32 213.940 9.07 1.60311 60.6 33 -87.683 2.50 1.84666 23.9 34 -280.740 0.20 35 128.221 8.81 1.62041 60.3 36 -137.702 (variable) 37 (Aperture) ∞ 3.32 38 -58.030 1.50 1.60300 65.4 39 27.203 3.07 1.72047 34.7 40 47.944 6.04 41 ∞ 17.45 1.83481 42.7 42∞5.41 43 -44.210 1.20 1.81600 46.6 44 35.063 10.43 1.72825 28.5 45 -32.800 0.15 46 -51.153 6.32 1.83481 42.7 47 137.443 0.15 48 56.922 13.40 1.71736 29.5 49 -157.402 5.09 50 -4938.972 4.00 1.75500 52.3 51 41.983 10.15 1.51823 58.9 52 -68.541 0.15 53 -1378.843 11.20 1.51633 64.1 54 -25.522 1.40 1.85025 30.1 55 -105.630 0.15 56 657.299 8.05 1.51633 64.1 57 -36.928 0.99 58 50.711 8.39 1.53996 59.5 59 -55.709 1.42 1.84666 23.9 60 -706.357 5.00 61 ∞ 33.00 1.60859 46.4 62 ∞ 13.20 1.51633 64.2 63 ∞ (variable) Image plane ∞ Aspheric data Page 28 K = 0.00000e+000 A 4= 2.32112e-007 A 6= 2.35378e-010 A 8=-2.98860e-013 A10= 1.74212e-016 Various data Zoom ratio 18.50 Wide-angle Mid-range Telephoto Focal length 7.20 31.29 133.17 F-number 1.54 1.54 1.85 Angle of view 37.38 9.97 2.36 Image height 5.50 5.50 5.50 Lens length 565.91 565.91 565.91 BF 47.07 47.07 47.07 d17 5.08 79.08 112.22 d26 150.47 62.77 4.53 d36 2.15 15.84 40.95 d63 12.90 12.90 12.90 Zoom lens group data Group starting plane focal length 1 1 113.04 2 18 -29.50 3 27 49.00 4 37 30.04 <Optical system including folded optical path (after the splitter element PR)> Unit: mm Surface Data Surface number rd nd vd 41 ∞ 43.00 1.83481 42.7 42 ∞ 1.47 43 10.076 3.70 1.63980 34.5 44 71.972 0.20 45 9.289 3.98 1.43875 94.7 46 -37.000 1.50 2.00100 29.1 47 6.544 1.72 48 10.003 5.17 1.64000 60.1 49 -6.240 0.70 1.95375 32.3 50 -20.723 (variable) Image plane ∞ Wide-angle Mid-range Telephoto Focal length 4.32 18.78 79.92 F-number 3.80 3.80 3.80 Angle of view 37.38 9.97 2.36 Image height 3.30 3.30 3.30 Lens total length 483.76 483.76 483.76 BF 9.00 9.00 9.00 d17 5.08 79.08 112.22 d26 150.47 62.77 4.53 d36 2.15 15.84 40.95 d50 9.00 9.00 9.00 Zoom lens group data Group starting plane focal length 4 37 27.71

[0040] [Table 1]

[0041] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist of the present invention. [Explanation of symbols]

[0042] L1 First lens group L2 2nd lens group (consists of multiple lens groups) L3: Third lens group (consists of multiple lens groups) L4 4th lens group (consists of multiple lens groups) L5: Fifth lens group (final lens group) PR splitter element in the final lens group Relay section where transmitted light from the LR splitter element enters Relay section where reflected light from the LA dividing element enters

Claims

1. A zoom lens having, arranged in order from an object side to an image side, a first lens group at least a part of which moves during focusing, a plurality of lens groups which move during zooming, an aperture stop, and a final lens group which does not move for zooming, the final lens group includes a splitter element that splits incident light into transmitted light and reflected light, a first relay unit with positive refractive power onto which the transmitted light is incident, and a second relay unit with positive refractive power onto which the reflected light is incident, the splitting element includes an incident surface and a splitting surface that splits light from the incident surface into the transmitted light and the reflected light, the reflected light is reflected by the incident surface and then incident on the second relay unit, When the focal length of the zoom lens including the first relay unit at the wide-angle end is Fw and the focal length of the zoom lens including the second relay unit at the wide-angle end is FwP, 0.50<FwP / Fw<0.80 A zoom lens that satisfies the following conditions:

2. 2. The zoom lens according to claim 1, wherein the second relay portion comprises, arranged in order from the object side to the image side, a first positive lens and a cemented lens formed by cementing a positive lens and a negative lens.

3. 3. The zoom lens according to claim 1, wherein the plurality of lens groups includes a lens group having positive refractive power that is disposed adjacent to the aperture stop on the object side and moves toward the object side during zooming from the wide-angle end to the telephoto end.

4. In the cemented lens, when the Abbe number of the material of the positive lens is νLAG2 and the Abbe number of the material of the negative lens is νLAG3, 30<νLAG2−νLAG3<80 3. The zoom lens according to claim 2, wherein the following condition is satisfied:

5. When a distance from the aperture stop to an image plane corresponding to the second relay unit is L and an optical path length within the splitter element in the optical path leading to the image plane is PRL, 0.35<PRL / L<0.60 5. The zoom lens according to claim 1, wherein the following condition is satisfied:

6. 0.50<FwP / Fw<0.75 6. The zoom lens according to claim 1, wherein the following condition is satisfied:

7. 7. The zoom lens according to claim 1, wherein the plurality of lens groups include, in order from the object side to the image side, a lens group having a negative refractive power and a lens group having a positive refractive power.

8. When the refractive power of the object-side surface of the lens arranged closest to the object in the second relay unit is φLAG1R1 and the focal length of the second relay unit is fLA, 0.20<(fLA×φLAG1R1)−1<1.00 8. The zoom lens according to claim 1, wherein the following condition is satisfied:

9. A zoom lens according to any one of claims 1 to 8; An imaging device comprising an imaging element for capturing an image formed by the zoom lens, and a light receiving section for adding an autofocus function.

10. 10. The imaging device according to claim 9, wherein the imaging element is disposed on an image plane corresponding to the first relay unit, and the light receiving unit is disposed on an image plane corresponding to the second relay unit.

Images