Imaging lens and imaging apparatus

Abstract

To provide an imaging lens having a larger image circle, a smaller F number, and a further smaller configuration, with aberration favorably corrected, and also to provide an imaging apparatus equipped with the imaging lens.SOLUTION: An imaging lens includes, sequentially from an object side to an image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power. When focusing, at least the second lens group is moved. The second lens group is a group closest to the object side from among the groups that move when focusing. The first lens group includes two positive lenses, continuously from a position closest to the object side to the image side. The third lens group includes a lens component having a negative refractive power at a position closest to the image side. The imaging lens satisfies a prescribed conditional expression.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The technology of the present disclosure relates to an imaging lens and an imaging device. [Background technology]

[0002] BACKGROUND ART Lens systems described in Patent Documents 1 and 2 below are known as imaging lenses used in digital cameras and the like. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-023693 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-111254 Summary of the Invention [Problem to be solved by the invention]

[0004] There is a demand for an imaging lens that has a large image circle, a small F-number, a compact design, and excellent correction of aberrations.

[0005] An object of the present disclosure is to provide an imaging lens that has a large image circle, a small F-number, is configured to be more compact, and has well-corrected aberrations, and an imaging device that includes this imaging lens. [Means for solving the problem]

[0006] An imaging lens according to one aspect of the techniques disclosed herein includes, in order from the object side to the image side, a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power, wherein at least the second lens group moves along the optical axis during focusing, and the second lens group is the group closest to the object among the groups that move during focusing, and the first lens group includes two positive lenses in succession from the most object side to the image side, and when one lens component is a single lens or a pair of cemented lenses, the third lens group includes a lens component having negative refractive power closest to the image side, 0.14 <DG1 / DA<0.5 (1) 0.02<(tanωm) / Fno<0.15 (2) The following conditional expressions (1) and (2) are satisfied. Here, DG1 is the distance on the optical axis from the lens surface in the first lens group closest to the object to the lens surface in the first lens group closest to the image. DA is the distance on the optical axis from the lens surface in the first lens group closest to the object to the lens surface in the third lens group closest to the image when focused on an object at infinity. ωm is the maximum half angle of view when focused on an object at infinity. Fno is the maximum open F-number when focused on an object at infinity.

[0007] When the average value of the Abbe numbers of all the positive lenses included in the first lens group based on the d-line is taken as ν1pave, the imaging lens of the above aspect has the following: 55<ν1pave<95 (3) It is preferable to satisfy conditional expression (3) below.

[0008] It is preferable that the first lens group includes, in succession from the most object side to the image side, the two positive lenses, a positive lens, and a negative lens.

[0009] It is preferable that an aperture stop be disposed between the lens surface of the first lens group closest to the image side and the lens surface of the second lens group closest to the object side.

[0010] It is preferable that the first lens group includes only six lenses consisting of, in order from the object side to the image side, the two positive lenses, a positive lens, a negative lens, a positive lens, and a negative lens.

[0011] The second lens group preferably includes at least one positive lens and at least one negative lens.

[0012] The second lens group may be configured to include a set of cemented lenses formed by cementing together a positive lens and a negative lens.

[0013] It is preferable that a lens component having positive refractive power be disposed adjacent to the object side of the lens component having negative refractive power that is located closest to the image side in the third lens group.

[0014] an aperture stop is disposed between the lens surface of the first lens group closest to the image side and the lens surface of the second lens group closest to the object side, and the lens surface of the first lens group closest to the image side and the lens surface of the second lens group closest to the object side have a concave shape; and the imaging lens of the above aspect is 0.7<(RG1r-RG2f) / f<4 (4) It is preferable to satisfy conditional expression (4) expressed as follows. Here, the radius of curvature of the lens surface in the first lens group closest to the image is defined as RG1r. The radius of curvature of the lens surface in the second lens group closest to the object is defined as RG2f. The focal length of the imaging lens when focused on an object at infinity is defined as f.

[0015] When the back focus of the imaging lens at the air-equivalent distance when focused on an object at infinity is Bf and the focal length of the imaging lens at the infinity is f, the imaging lens of the above aspect has the following characteristics: 0.7 <Bf / (f×tanωm)<3 (5) It is preferable to satisfy conditional expression (5) below.

[0016] When the focal length of the imaging lens in a state where it is focused on an object at infinity is f, and the focal length of the lens component in the third lens group that is closest to the image and has negative refractive power is fLe1, the imaging lens of the above aspect satisfies the following formula: -3.2 <f / fLe1<-0.6 (6) It is preferable to satisfy conditional expression (6) below.

[0017] When the lateral magnification of the second lens group when focused on an object at infinity is β2, and the lateral magnification of the third lens group when focused on an object at infinity is β3, the imaging lens of the above aspect has the following relationship: 1.3<|(1-β2 2 )×β3 2 |<3.5 (7) It is preferable to satisfy conditional expression (7) below.

[0018] When the sum of DA and the back focus of the imaging lens at the air-equivalent distance when focused on an object at infinity is TL, the imaging lens of the above embodiment has the following: 0.1 <DG1 / TL<0.3 (8) It is preferable to satisfy conditional expression (8) below.

[0019] When the height from the optical axis of the on-axis marginal ray on the lens surface closest to the image in the first lens group in a state where the object at infinity is focused is H1r, and the height from the optical axis of the on-axis marginal ray on the lens surface closest to the object in the first lens group in a state where the object at infinity is focused is H1f, the imaging lens of the above aspect satisfies the following conditions: 0.5 <H1r / H1f<0.85 (9) It is preferable to satisfy conditional expression (9) below.

[0020] When Den is the distance on the optical axis from the lens surface of the first lens group closest to the object to the paraxial entrance pupil position when focused on an object at infinity, and f is the focal length of the imaging lens when focused on an object at infinity, the imaging lens of the above aspect satisfies the following conditions: 0.2 <Den / f<0.5 (10) It is preferable to satisfy conditional expression (10) below.

[0021] When the focal length of the imaging lens in a state where it is focused on an object at infinity is f, and the focal length of the first lens group is f1, the imaging lens of the above aspect has the following characteristics: 1.2 <f / f1<2 (11) It is preferable to satisfy conditional expression (11) below.

[0022] When the focal length of the imaging lens in a state where it is focused on an object at infinity is f, and the focal length of the second lens group is f2, the imaging lens of the above aspect has the following characteristics: -3 <f / f2<-1.3 (12) It is preferable to satisfy conditional expression (12) below.

[0023] When the focal length of the imaging lens in a state where it is focused on an object at infinity is f, and the focal length of the third lens group is f3, the imaging lens of the above aspect has the following characteristics: 0.8 <f / f3<2.5 (13) It is preferable to satisfy conditional expression (13) below.

[0024] When the distance on the optical axis from the lens surface of the second lens group closest to the object to the lens surface of the second lens group closest to the image is defined as DG2, and the sum of DA and the back focus of the imaging lens at an air-equivalent distance when focused on an object at infinity is defined as TL, the imaging lens of the above aspect has the following characteristics: 0.02 <DG2 / TL<0.1 (14) It is preferable to satisfy conditional expression (14) below.

[0025] Another aspect of the present disclosure is an imaging device including the imaging lens of the above aspect.

[0026] In this specification, the terms "consisting of" and "consisting of" are intended to mean that, in addition to the listed components, other components may also be included, such as lenses that have substantially no refractive power, optical elements other than lenses, such as apertures, filters, and cover glasses, and mechanical parts, such as lens flanges, lens barrels, image sensors, and image stabilization mechanisms.

[0027] In this specification, a "group having positive refractive power" means that the group as a whole has positive refractive power. Similarly, a "group having negative refractive power" means that the group as a whole has negative refractive power. A "lens having positive refractive power" and a "positive lens" are synonymous. A "lens having negative refractive power" and a "negative lens" are synonymous. In this specification, a "group" is not limited to a configuration consisting of multiple lenses, and may be a configuration consisting of only one lens.

[0028] A hybrid aspherical lens (a lens in which a lens (e.g., a spherical lens) and an aspherical film formed on that lens are integrally constructed, functioning as a single aspherical lens overall) is not considered a cemented lens, but is treated as a single lens. Unless otherwise specified, the radius of curvature, sign of refractive power, and surface shape of lenses including aspherical surfaces are those in the paraxial region. The sign of the radius of curvature of a surface with a convex shape facing the object side is positive, and the sign of the radius of curvature of a surface with a convex shape facing the image side is negative.

[0029] The "focal length" used in the conditional expressions is the paraxial focal length. The "distance on the optical axis" used in the conditional expressions is the geometric distance unless otherwise specified. The values ​​used in the conditional expressions are values ​​based on the d-line when focused on an object at infinity, unless otherwise specified.

[0030] The terms "d-line," "C-line," "F-line," and "g-line" used in this specification are emission lines, and the wavelength of the d-line is treated as 587.56 nm (nanometers), the wavelength of the C-line as 656.27 nm (nanometers), the wavelength of the F-line as 486.13 nm (nanometers), and the wavelength of the g-line as 435.84 nm (nanometers). [Effects of the Invention]

[0031] According to the present disclosure, it is possible to provide an imaging lens that has a large image circle, a small F-number, is configured to be more compact, and in which aberrations are well corrected, and an imaging device that includes this imaging lens. [Brief explanation of the drawings]

[0032] [Figure 1] 1 is a cross-sectional view showing the configuration of an imaging lens according to one embodiment, corresponding to the imaging lens of Example 1. FIG. [Figure 2] 2A to 2C are cross-sectional views showing the configuration and light beams in each state of the imaging lens of FIG. 1. [Figure 3] FIG. 10 is a diagram for explaining symbols in a conditional expression. [Figure 4] 3A to 3C are diagrams showing various aberrations of the imaging lens of Example 1. [Figure 5] FIG. 10 is a cross-sectional view showing the configuration of an imaging lens according to a second embodiment. [Figure 6] 10A to 10C are diagrams showing various aberrations of the imaging lens of Example 2. [Figure 7] FIG. 10 is a cross-sectional view showing the configuration of an imaging lens according to a third embodiment. [Figure 8] 10A to 10C are diagrams showing various aberrations of the imaging lens of Example 3. [Figure 9] FIG. 10 is a cross-sectional view showing the configuration of an imaging lens according to a fourth embodiment. [Figure 10] 10A to 10C are diagrams showing various aberrations of the imaging lens of Example 4. [Figure 11] FIG. 10 is a cross-sectional view showing the configuration of an imaging lens according to a fifth embodiment. [Figure 12] 10A to 10C are diagrams showing various aberrations of the imaging lens of Example 5. [Figure 13] FIG. 10 is a cross-sectional view showing the configuration of an imaging lens according to a sixth embodiment. [Figure 14] 10A to 10C are diagrams showing various aberrations of the imaging lens of Example 6. [Figure 15] FIG. 10 is a cross-sectional view showing the configuration of an imaging lens according to a seventh embodiment. [Figure 16] 10A to 10C are diagrams showing various aberrations of the imaging lens of Example 7. [Figure 17] FIG. 13 is a cross-sectional view showing the configuration of an imaging lens according to an eighth embodiment. [Figure 18] 13A to 13C are diagrams showing various aberrations of the imaging lens of Example 8. [Figure 19] FIG. 13 is a cross-sectional view showing the configuration of an imaging lens according to a ninth embodiment. [Figure 20] 13A to 13C are diagrams showing various aberrations of the imaging lens of Example 9. [Figure 21]FIG. 20 is a cross-sectional view showing the configuration of an imaging lens according to a tenth embodiment. [Figure 22] 13A to 13C are diagrams showing various aberrations of the imaging lens of Example 10. [Figure 23] FIG. 20 is a cross-sectional view showing the configuration of an imaging lens according to an eleventh embodiment. [Figure 24] 13A to 13C are diagrams showing various aberrations of the imaging lens of Example 11. [Figure 25] FIG. 22 is a cross-sectional view showing the configuration of an imaging lens according to a twelfth embodiment. [Figure 26] 13A to 13C are diagrams showing various aberrations of the imaging lens of Example 12. [Figure 27] FIG. 22 is a cross-sectional view showing the configuration of an imaging lens according to a thirteenth embodiment. [Figure 28] 20A to 20C are diagrams showing various aberrations of the imaging lens of Example 13. [Figure 29] 1 is a perspective view of the front side of an imaging device according to an embodiment. [Figure 30] FIG. 2 is a perspective view of the rear side of the imaging device according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0033] Hereinafter, embodiments of the technology of the present disclosure will be described with reference to the drawings.

[0034] FIG. 1 shows a cross-sectional view of the configuration of an imaging lens according to an embodiment of the present disclosure when focused on an object at infinity. FIG. 2 shows cross-sectional views of the configuration and light beams of the imaging lens in each focus state of FIG. 1. In FIG. 2, the upper row labeled "infinity" shows the state when focused on an object at infinity, and the lower row labeled "close distance" shows the state when focused on an object at close range. FIG. 2 shows the axial light beam 2 and the light beam 3 at the maximum half angle of view ωm when focused on an object at infinity, as well as the axial light beam and the light beam at the maximum half angle of view ωm when focused on an object at close range. In FIGS. 1 and 2, the left side is the object side, and the right side is the image side. The example shown in FIGS. 1 and 2 corresponds to the imaging lens of Example 1, which will be described later. The following description will mainly refer to FIG. 1.

[0035] FIG. 1 shows an example in which a parallel-plate optical member PP is arranged between the imaging lens and the image plane Sim, assuming that the imaging lens is applied to an imaging device. The optical member PP is a member that is assumed to include various filters and / or cover glass. The various filters are low-pass filters, infrared cut filters, and / or filters that cut off specific wavelength ranges. The optical member PP is a member that does not have refractive power. It is also possible to configure an imaging device without the optical member PP.

[0036] The imaging lens of the present disclosure is composed of, in order from the object side to the image side along the optical axis Z, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. This configuration is advantageous for making the entire lens system compact.

[0037] As an example, each group of the imaging lens in FIG. 1 is configured as follows: The first lens group G1 consists of, in order from the object side to the image side, six lenses, lenses L11 to L16, and an aperture diaphragm St. The second lens group G2 consists of, in order from the object side to the image side, two lenses, lenses L21 to L22. The third lens group G3 consists of, in order from the object side to the image side, eight lenses, lenses L31 to L38. Note that the aperture diaphragm St in FIG. 1 does not indicate the size or shape, but rather its position in the direction of the optical axis.

[0038] In Figure 1, a horizontal arrow is written below the focusing group to indicate the direction of movement during focusing from an object at infinity to a close-up object. In this specification, a "focusing group" is a group that moves along the optical axis Z during focusing. In the example of Figure 1, the focusing group consists solely of the second lens group G2. The parentheses and right-pointing arrow below the second lens group G2 in Figure 1 indicate that the second lens group G2 is the focusing group and that the second lens group G2 moves toward the image side during focusing from an object at infinity to a close-up object.

[0039] In the imaging lens of the present disclosure, during focusing, at least the second lens group G2 moves along the optical axis Z. By configuring the imaging lens so that focusing is performed by moving at least the second lens group G2, it is possible to reduce the weight of the focusing group and increase the focusing speed.

[0040] While the imaging lens in the example of FIG. 1 includes only one focusing group, an imaging lens according to the present disclosure may be configured to include multiple focusing groups that move along the optical axis Z at different intervals during focusing. In the technology of the present disclosure, when an imaging lens includes one or more focusing groups, the focusing group closest to the object among these one or more focusing groups is the second lens group G2. In the imaging lens according to the present disclosure, the group consisting of all optical elements closer to the object than the second lens group G2 is the first lens group G1, and the group consisting of all optical elements closer to the image than the second lens group G2 is the third lens group G3. The above "optical elements" include lenses, aperture diaphragm St, etc.

[0041] As in the example of Figure 1, if the imaging lens is configured to include only one focusing group, this is advantageous for reducing the weight of the entire lens system. If the imaging lens is configured to include multiple focusing groups, this is advantageous for suppressing aberration fluctuations during focusing. For example, the imaging lens of the present disclosure may be configured so that, during focusing, the entire second lens group G2 and part of the third lens group G3 move along the optical axis Z with different spacings between them. This is advantageous for improving optical performance when focusing on a close-distance object.

[0042] The first lens group G1 is configured to include two positive lenses, arranged in succession from the object side to the image side, which is advantageous for making the optical system compact while effectively correcting spherical aberration and axial chromatic aberration.

[0043] The first lens group G1 may be configured to include, in succession from the object side to the image side, a positive lens, a positive lens, a positive lens, and a negative lens, which is advantageous in that it allows the optical system to be made compact while providing good correction for spherical aberration and axial chromatic aberration.

[0044] For example, the first lens group G1 may be configured to include only six lenses, consisting of, in order from the object side to the image side, a positive lens, a positive lens, a positive lens, a negative lens, a positive lens, and a negative lens. This is advantageous for excellent correction of spherical aberration and axial chromatic aberration. When the first lens group G1 includes the six lenses described above, the first lens group G1 may be configured to include a cemented lens in which a positive lens and a negative lens are cemented together. This is advantageous for correcting chromatic aberration. To obtain better characteristics, it is preferable that the first lens group G1 include two pairs of the above cemented lenses.

[0045] The second lens group G2 preferably includes at least one positive lens and at least one negative lens, which is advantageous for suppressing fluctuations in axial chromatic aberration during focusing.

[0046] The second lens group G2 may be configured to include a cemented lens set consisting of a positive lens and a negative lens, which is advantageous for reducing the weight of the focusing group while suppressing fluctuations in axial chromatic aberration during focusing.

[0047] The third lens group G3 is configured to include a lens component with negative refractive power closest to the image side. This configuration is advantageous for shortening the overall length of the lens system. In this specification, one lens component is defined as one single lens or one set of cemented lenses. A "single lens" is a single lens that is not cemented.

[0048] It is preferable to arrange a lens component with positive refractive power adjacent to the object side of the lens component with negative refractive power that is closest to the image in the third lens group G3, which is advantageous for shortening the overall length of the lens system.

[0049] It is preferable that the third lens group G3 includes at least one cemented lens and a single lens having negative refractive power, which is advantageous for effectively correcting lateral chromatic aberration and shortening the overall length of the lens system.

[0050] The number of lenses included in the third lens group G3 is preferably four or more, which is advantageous for correcting astigmatism. To obtain better characteristics, the number of lenses included in the third lens group G3 is more preferably five or more, and even more preferably six or more.

[0051] It is preferable that the number of lenses included in the third lens group G3 be 13 or less. This is advantageous for reducing the weight of the optical system and the overall length of the lens system. To obtain better characteristics, it is more preferable that the number of lenses included in the third lens group G3 be 12 or less, even more preferably 11 or less, and even more preferably 10 or less.

[0052] The imaging lens includes an aperture stop St, and it is preferable that the lens surface adjacent to the object side of the aperture stop St and the lens surface adjacent to the image side of the aperture stop St are concave. In this case, the air lens formed by the two lens surfaces facing each other across the aperture stop St has a biconvex shape, making it easy to appropriately correct spherical aberration and astigmatism. In this specification, the air gap sandwiched between the two opposing lens surfaces is considered to be a lens with a refractive index of 1, and this air gap is called the air lens.

[0053] The aperture stop St may be arranged between the lens surface of the first lens group G1 closest to the image and the lens surface of the second lens group G2 closest to the object. By arranging the aperture stop St relatively close to the object in this way, the outer diameter of the lens on the object side can be made smaller, which contributes to reducing the weight of the optical system.

[0054] The imaging lens may be configured to include an image stabilization group that moves in a direction intersecting the optical axis Z during image blur correction. If the imaging lens includes an image stabilization group, it is preferable that the image stabilization group be disposed within the third lens group G3. In this way, providing the image stabilization group in a portion of the lens where the outer diameter is relatively small is advantageous for reducing the diameter of the entire lens system.

[0055] When a vibration reduction group is disposed within the third lens group G3, it is preferable that the third lens group G3 include a fixed group that has a refractive power of the opposite sign to that of the vibration reduction group, does not move during image blur correction, and is disposed on the object side of the vibration reduction group. In this case, the vibration reduction sensitivity of the vibration reduction group (i.e., the amount of image blur correction per unit movement of the vibration reduction group) can be improved, which is advantageous for making the diameter of the optical system smaller.

[0056] The third lens group G3 may be configured to include, in order from the object side to the image side, a first subgroup having positive refractive power, a second subgroup having negative refractive power, and a third subgroup having positive refractive power, with only the second subgroup moving in a direction intersecting the optical axis Z during image blur correction. That is, the vibration-reduction group may be configured to include the second subgroup. By using a vibration-reduction group having negative refractive power and sandwiching it between groups having positive refractive power that do not move during image blur correction, vibration-reduction sensitivity can be improved, which is advantageous for reducing the diameter of the optical system. Furthermore, if the third lens group G3 is fixed relative to the image plane Sim during focusing, providing a vibration-reduction group in the third lens group G3 that does not move during focusing can contribute to simplifying the mechanical structure.

[0057] In the example of Fig. 1, the group consisting of lens L31 corresponds to the first subgroup, the group consisting of lenses L32 to L34 corresponds to the second subgroup, and the group consisting of lenses L35 to L38 corresponds to the third subgroup. The parentheses and downward arrows below lenses L32 to L34 in Fig. 1 indicate that lenses L32 to L34 are image stabilization groups.

[0058] It is preferable that the image stabilization group includes a cemented lens in which a positive lens and a negative lens are cemented together. This is advantageous for correcting color bleeding during image blur correction. Furthermore, using a cemented lens makes it easier to assemble with high precision.

[0059] The vibration reduction group may be configured to include a cemented lens and a single lens, which is advantageous for correcting color bleeding during image blur correction.

[0060] Below, a description is given of a preferred configuration of the imaging lens of the present disclosure with respect to the conditional expressions. In the following description of the conditional expressions, to avoid redundancy, the same symbols are used for elements with the same definitions, and duplicate explanations of the symbols are omitted. Also, to avoid redundancy, hereinafter, "the imaging lens of the present disclosure" will also be referred to simply as "the imaging lens."

[0061] It is preferable that the imaging lens satisfy the following conditional expression (1). Here, DG1 is the distance on the optical axis from the lens surface of the first lens group G1 closest to the object to the lens surface of the first lens group G1 closest to the image. DA is the distance on the optical axis from the lens surface of the first lens group G1 closest to the object to the lens surface of the third lens group G3 closest to the image when focused on an object at infinity. FIG. 3 shows the imaging lens of FIG. 1, and illustrates the above-mentioned distances DG1 and DA as an example. Note that some of the lens reference symbols are omitted in FIG. 3. Ensuring that the value corresponding to conditional expression (1) is not equal to or less than the lower limit is advantageous for correcting spherical aberration. Ensuring that the value corresponding to conditional expression (1) is not equal to or greater than the upper limit is advantageous for reducing the weight of the optical system and the overall length of the lens system. 0.14 <DG1 / DA<0.5 (1)

[0062] To obtain better characteristics, the lower limit of conditional expression (1) should preferably be 0.16, more preferably 0.18, and even more preferably 0.2.To obtain better characteristics, the upper limit of conditional expression (1) should preferably be 0.4, more preferably 0.35, and even more preferably 0.3.

[0063] It is preferable that the imaging lens satisfy the following conditional expression (2). Here, the maximum half angle of view when focused on an object at infinity is defined as ωm. The unit of ωm is degrees. The maximum F-number when focused on an object at infinity is defined as Fno. As an example, FIG. 2 shows the above maximum half angle of view ωm. By ensuring that the corresponding value of conditional expression (2) is not equal to or less than the lower limit, it becomes easy to reduce the maximum F-number while widening the angle of view and ensuring a large image circle. By ensuring that the corresponding value of conditional expression (2) is not equal to or greater than the upper limit, it becomes easy to suppress an increase in the number of lenses and an increase in the size of the optical system while obtaining good optical performance. 0.02<(tanωm) / Fno<0.15 (2)

[0064] To obtain better characteristics, the lower limit of conditional expression (2) should preferably be set to 0.03, more preferably 0.04, and even more preferably 0.05.To obtain better characteristics, the upper limit of conditional expression (2) should preferably be set to 0.1, more preferably 0.09, and even more preferably 0.085.

[0065] It is preferable that the imaging lens satisfy the following conditional expression (3). Here, the average value of the Abbe numbers of all the positive lenses included in the first lens group G1 based on the d-line is defined as ν1pave. Ensuring that the corresponding value of conditional expression (3) is not equal to or smaller than the lower limit thereof is advantageous for good correction of longitudinal chromatic aberration. Ensuring that the corresponding value of conditional expression (3) is not equal to or larger than the upper limit thereof increases the availability of materials, allowing the use of materials that are easier to manufacture. 55<ν1pave<95 (3)

[0066] In order to obtain better characteristics, the lower limit of conditional expression (3) should preferably be set to 60, more preferably to 63, and even more preferably to 65. In order to obtain better characteristics, the upper limit of conditional expression (3) should preferably be set to 90, more preferably to 80, and even more preferably to 78.

[0067] In a configuration in which an aperture stop St is disposed between the lens surface of the first lens group G1 closest to the image and the lens surface of the second lens group G2 closest to the object, and the lens surfaces of the first lens group G1 closest to the image and the second lens group G2 closest to the object are concave, it is preferable that the imaging lens satisfy the following conditional formula (4). Here, the radius of curvature of the lens surface of the first lens group G1 closest to the image is defined as RG1r. The radius of curvature of the lens surface of the second lens group G2 closest to the object is defined as RG2f. The focal length of the imaging lens when focused on an object at infinity is defined as f. Satisfying conditional formula (4) prevents the refractive power of one surface forming the air lens containing the aperture stop St from being too strong or too weak relative to the refractive power of the other surface, making it easier to properly correct spherical aberration. 0.7<(RG1r-RG2f) / f<4 (4)

[0068] In order to obtain better characteristics, the lower limit of conditional expression (4) should preferably be set to 0.8, more preferably to 0.9, and even more preferably to 1. In order to obtain better characteristics, the upper limit of conditional expression (4) should preferably be set to 3.5, more preferably to 3, and even more preferably to 2.8.

[0069] It is preferable that the imaging lens satisfy the following conditional expression (5). Here, Bf is the back focal length of the imaging lens at the air-equivalent distance when focused on an object at infinity. By ensuring that the corresponding value of conditional expression (5) is not equal to or less than the lower limit, it is possible to prevent the angle of incidence of the chief ray of the off-axial light beam on the image plane Sim from becoming too large, which is advantageous for preventing the occurrence of color shading. By ensuring that the corresponding value of conditional expression (5) is not equal to or greater than the upper limit, the back focal length does not become too long, which is advantageous for shortening the overall length of the lens system. 0.7 <Bf / (f×tanωm)<3 (5)

[0070] In order to obtain better characteristics, the lower limit of conditional expression (5) should preferably be set to 0.85, more preferably to 1, and even more preferably to 2.1. In order to obtain better characteristics, the upper limit of conditional expression (5) should preferably be set to 2.6, more preferably to 2.4, and even more preferably to 2.35.

[0071] It is preferable that the imaging lens satisfy the following conditional expression (6). Here, the focal length of the lens component having negative refractive power closest to the image in the third lens group G3 is set to fLe1. Ensuring that the corresponding value of conditional expression (6) is not equal to or less than the lower limit thereof is advantageous for correcting distortion. Ensuring that the corresponding value of conditional expression (6) is not equal to or greater than the upper limit thereof ensures that the lens component closest to the image in the third lens group G3 has negative refractive power, which is advantageous for preventing the diameter of the lens closest to the image from becoming large. -3.2 <f / fLe1<-0.6 (6)

[0072] In order to obtain better characteristics, the lower limit of conditional expression (6) should preferably be set to -2.9, more preferably to -2.7, and even more preferably to -2.5.In order to obtain better characteristics, the upper limit of conditional expression (6) should preferably be set to -0.7, more preferably to -0.75, and even more preferably to -0.8.

[0073] It is preferable that the imaging lens satisfy the following conditional expression (7). Here, the lateral magnification of the second lens group G2 when focused on an object at infinity is defined as β2. The lateral magnification of the third lens group G3 when focused on an object at infinity is defined as β3. By ensuring that the corresponding value of conditional expression (7) is not equal to or less than the lower limit, the amount of movement of the second lens group G2 during focusing can be shortened, which is advantageous for shortening the overall length of the lens system. By ensuring that the corresponding value of conditional expression (7) is not equal to or greater than the upper limit, fluctuations in spherical aberration and field curvature during focusing can be suppressed. 1.3<|(1-β2 2 )×β3 2 |<3.5 (7)

[0074] In order to obtain better characteristics, the lower limit of conditional expression (7) should preferably be set to 1.5, more preferably 1.6, and even more preferably 1.65.In order to obtain better characteristics, the upper limit of conditional expression (7) should preferably be set to 3, more preferably 2.8, and even more preferably 2.65.

[0075] It is preferable that the imaging lens satisfy the following conditional expression (8). Here, TL is the sum of DA and the back focal length of the imaging lens at the air-equivalent distance when focused on an object at infinity. Ensuring that the value corresponding to conditional expression (8) is not equal to or smaller than the lower limit thereof is advantageous for good correction of axial chromatic aberration. Ensuring that the value corresponding to conditional expression (8) is not equal to or larger than the upper limit thereof is advantageous for shortening the overall length and reducing the weight of the lens system. 0.1 <DG1 / TL<0.3 (8)

[0076] In order to obtain better characteristics, the lower limit of conditional expression (8) should preferably be set to 0.12, more preferably 0.13, and even more preferably 0.15.In order to obtain better characteristics, the upper limit of conditional expression (8) should preferably be set to 0.26, more preferably 0.24, and even more preferably 0.22.

[0077] It is preferable that the imaging lens satisfy the following conditional expression (9). Here, H1r denotes the height from the optical axis Z of the on-axis marginal ray on the lens surface of the first lens group G1 closest to the image when the lens is focused on an object at infinity. H1f denotes the height from the optical axis Z of the on-axis marginal ray on the lens surface of the first lens group G1 closest to the object when the lens is focused on an object at infinity. As an example, FIG. 3 shows the on-axis marginal ray 2m, the above height H1r, and the above height H1f. By ensuring that the value corresponding to conditional expression (9) is not equal to or less than the lower limit, the light-gathering effect of the first lens group G1 alone does not become too strong, which is advantageous for correcting spherical aberration. By ensuring that the value corresponding to conditional expression (9) is not equal to or greater than the upper limit, the outer diameter of the first lens group G1 can be prevented from becoming too large, which is advantageous for reducing weight. 0.5 <H1r / H1f<0.85 (9)

[0078] In order to obtain better characteristics, the lower limit of conditional expression (9) should preferably be set to 0.55, more preferably to 0.6, and even more preferably to 0.65.In order to obtain better characteristics, the upper limit of conditional expression (9) should preferably be set to 0.8, more preferably to 0.78, and even more preferably to 0.75.

[0079] It is preferable that the imaging lens satisfy the following conditional expression (10). Here, Den is the distance on the optical axis from the lens surface of the first lens group G1 closest to the object to the paraxial entrance pupil position when focused on an object at infinity. As an example, FIG. 3 shows the above distance Den. Ensuring that the value corresponding to conditional expression (10) is not equal to or smaller than the lower limit is advantageous for suppressing distortion. Ensuring that the value corresponding to conditional expression (10) is not equal to or larger than the upper limit is advantageous for reducing the size of the first lens group G1. 0.2 <Den / f<0.5 (10)

[0080] In order to obtain better characteristics, the lower limit of conditional expression (10) should preferably be set to 0.22, more preferably to 0.24, and even more preferably to 0.25.In order to obtain better characteristics, the upper limit of conditional expression (10) should preferably be set to 0.45, more preferably to 0.4, and even more preferably to 0.35.

[0081] When the focal length of the first lens group G1 is f1, it is preferable that the imaging lens satisfy the following conditional expression (11). By ensuring that the corresponding value of conditional expression (11) is not equal to or less than the lower limit, the refractive power of the first lens group G1 does not become too weak, which is advantageous for shortening the overall length of the lens system. By ensuring that the corresponding value of conditional expression (11) is not equal to or greater than the upper limit, the refractive power of the first lens group G1 does not become too strong, which is advantageous for suppressing aberration fluctuations during focusing. 1.2 <f / f1<2 (11)

[0082] In order to obtain better characteristics, the lower limit of conditional expression (11) should preferably be set to 1.23, more preferably 1.25, and even more preferably 1.29.In order to obtain better characteristics, the upper limit of conditional expression (11) should preferably be set to 1.8, more preferably 1.67, and even more preferably 1.62.

[0083] When the focal length of the second lens group G2 is f2, it is preferable that the imaging lens satisfy the following conditional expression (12). By ensuring that the corresponding value of conditional expression (12) is not equal to or less than the lower limit, it is possible to suppress fluctuations in spherical aberration and field curvature during focusing. By ensuring that the corresponding value of conditional expression (12) is not equal to or greater than the upper limit, it is possible to reduce the amount of movement of the second lens group G2 during focusing, which is advantageous for reducing the overall length of the lens system. -3 <f / f2<-1.3 (12)

[0084] In order to obtain better characteristics, it is more preferable that the lower limit of conditional expression (12) be set to -2.8, even more preferably to -2.7, and even more preferably to -2.65.In order to obtain better characteristics, it is more preferable that the upper limit of conditional expression (12) be set to -1.5, even more preferably to -1.7, and even more preferably to -1.9.

[0085] When the focal length of the third lens group G3 is f3, it is preferable that the imaging lens satisfy the following conditional expression (13). By ensuring that the corresponding value of conditional expression (13) is not equal to or smaller than the lower limit, it becomes easier to make the angle of incidence of the chief ray on the image plane Sim smaller. By ensuring that the corresponding value of conditional expression (13) is not equal to or larger than the upper limit, it becomes advantageous for shortening the overall length of the lens system. 0.8 <f / f3<2.5 (13)

[0086] In order to obtain better characteristics, it is more preferable that the lower limit of conditional expression (13) be set to 1, more preferably 1.2, and even more preferably 1.3. In order to obtain better characteristics, it is more preferable that the upper limit of conditional expression (13) be set to 2, more preferably 1.8, and even more preferably 1.65.

[0087] It is preferable that the imaging lens satisfy the following conditional expression (14). Here, the distance on the optical axis from the lens surface of the second lens group G2 closest to the object to the lens surface of the second lens group G2 closest to the image is defined as DG2. As an example, FIG. 3 shows the above distance DG2. By ensuring that the value corresponding to conditional expression (14) is not equal to or smaller than the lower limit, it is possible to suppress fluctuations in spherical aberration and field curvature during focusing. By ensuring that the value corresponding to conditional expression (14) is not equal to or larger than the upper limit, it is advantageous for shortening the overall length and reducing the weight of the lens system. 0.02 <DG2 / TL<0.1 (14)

[0088] In order to obtain better characteristics, the lower limit of conditional expression (14) should preferably be set to 0.022, more preferably to 0.024, and even more preferably to 0.026.In order to obtain better characteristics, the upper limit of conditional expression (14) should preferably be set to 0.07, more preferably to 0.05, and even more preferably to 0.033.

[0089] It is preferable that the imaging lens satisfy the following conditional expression (15). Here, the composite focal length of the second lens group G2 and the third lens group G3 when focused on an object at infinity is set to f23. Ensuring that the corresponding value of conditional expression (15) is not equal to or smaller than the lower limit thereof is advantageous for making the lens system compact. Ensuring that the corresponding value of conditional expression (15) is not equal to or larger than the upper limit thereof is advantageous for correcting spherical aberration. -1.5 <f1 / f23<-0.01 (15)

[0090] In order to obtain better characteristics, the lower limit of conditional expression (15) should preferably be set to -1.2, more preferably to -0.9, and even more preferably to -0.8.In order to obtain better characteristics, the upper limit of conditional expression (15) should preferably be set to -0.011, more preferably to -0.012, and even more preferably to -0.013.

[0091] It is preferable that the imaging lens satisfy the following conditional expression (16). Here, the distance on the optical axis from the lens surface of the third lens group G3 closest to the object to the lens surface of the third lens group G3 closest to the image is defined as DG3. As an example, FIG. 3 shows the above distance DG3. Ensuring that the value corresponding to conditional expression (16) is not equal to or smaller than the lower limit is advantageous for correcting field curvature. Ensuring that the value corresponding to conditional expression (16) is not equal to or larger than the upper limit is advantageous for shortening the overall length and reducing the weight of the lens system. 0.15 <DG3 / TL<0.5 (16)

[0092] In order to obtain better characteristics, the lower limit of conditional expression (16) should preferably be set to 0.18, more preferably to 0.21, and even more preferably to 0.23.In order to obtain better characteristics, the upper limit of conditional expression (16) should preferably be set to 0.45, more preferably to 0.42, and even more preferably to 0.39.

[0093] It is preferable that the imaging lens satisfy the following conditional expression (17): By ensuring that the corresponding value of conditional expression (17) is not equal to or less than the lower limit, the refractive power of the first lens group G1 does not become too strong, which is advantageous for suppressing field curvature. By ensuring that the corresponding value of conditional expression (17) is not equal to or greater than the upper limit, which is advantageous for shortening the overall length of the lens system. -0.85 <f2 / f1<-0.4 (17)

[0094] In order to obtain better characteristics, the lower limit of conditional expression (17) should preferably be set to -0.8, more preferably to -0.75, and even more preferably to -0.72.In order to obtain better characteristics, the upper limit of conditional expression (17) should preferably be set to -0.5, more preferably to -0.55, and even more preferably to -0.61.

[0095] It is preferable that the imaging lens satisfy the following conditional expression (18). Here, the radius of curvature of the lens surface closest to the object of the lens component closest to the image in the third lens group G3 that has negative refractive power is RLe1f. The radius of curvature of the lens surface closest to the image of the lens component closest to the image in the third lens group G3 that has negative refractive power is RLe2r. Conditional expression (18) relates to the air lens formed by the lens surface closest to the object of the lens component closest to the image in the third lens group G3 and the lens surface adjacent to the object side of this lens surface. By satisfying conditional expression (18), the refractive power of one surface forming this air lens can be prevented from being too strong or too weak relative to the refractive power of the other surface. This allows the angle of incidence of the chief ray of the off-axis light beam on the image plane Sim to be maintained at an appropriate value, which is advantageous for good correction of astigmatism. -7<(RLe1f+RLe2r) / (RLe1f-RLe2r)<2.5 (18)

[0096] In order to obtain better characteristics, the lower limit of conditional expression (18) should preferably be set to -6.5, more preferably to -6, and even more preferably to -5.85.In order to obtain better characteristics, the upper limit of conditional expression (18) should preferably be set to 2, more preferably to 1.8, and even more preferably to 1.2.

[0097] It is preferable that the imaging lens satisfy the following conditional expression (19). Here, the radius of curvature of the lens surface of the second lens group G2 closest to the object is defined as RG2f. The radius of curvature of the lens surface of the second lens group G2 closest to the image is defined as RG2r. By ensuring that the corresponding value of conditional expression (19) is not equal to or less than the lower limit, it is possible to suppress the occurrence of astigmatism. By ensuring that the corresponding value of conditional expression (19) is not equal to or greater than the upper limit, it is advantageous for correcting spherical aberration. 0.3<(RG2f+RG2r) / (RG2f-RG2r)<1 (19)

[0098] In order to obtain better characteristics, the lower limit of conditional expression (19) should preferably be set to 0.34, more preferably to 0.36, and even more preferably to 0.39.In order to obtain better characteristics, the upper limit of conditional expression (19) should preferably be set to 0.9, more preferably to 0.8, and even more preferably to 0.72.

[0099] It is preferable that the imaging lens satisfy the following conditional expression (20): By ensuring that the corresponding value of conditional expression (20) is not equal to or less than the lower limit, it becomes easy to arrange the optimum number of lenses to correct various aberrations, which is advantageous for obtaining higher imaging performance. By ensuring that the corresponding value of conditional expression (20) is not equal to or greater than the upper limit, it is advantageous for preventing the lens diameter from becoming large. 2 <TL×Fno / f<4 (20)

[0100] In order to obtain better characteristics, it is more preferable that the lower limit of conditional expression (20) be set to 2.1, even more preferably to 2.3, and even more preferably to 2.4.In order to obtain better characteristics, it is more preferable that the upper limit of conditional expression (20) be set to 3.8, even more preferably to 3.6, and even more preferably to 3.4.

[0101] It is preferable that the imaging lens satisfy the following conditional expression (21). By ensuring that the corresponding value of conditional expression (21) is not equal to or smaller than the lower limit, it is advantageous to prevent over-correction of field curvature. By ensuring that the corresponding value of conditional expression (21) is not equal to or larger than the upper limit, it is advantageous to prevent under-correction of field curvature. -1.5 <f2 / f3<-0.45 (21)

[0102] In order to obtain better characteristics, it is more preferable that the lower limit of conditional expression (21) be set to -1, even more preferably to -0.8, and even more preferably to -0.76.In order to obtain better characteristics, it is more preferable that the upper limit of conditional expression (21) be set to -0.5, even more preferably to -0.52, and even more preferably to -0.56.

[0103] It is preferable that the imaging lens satisfy the following conditional expression (22). Here, the focal length of the lens component adjacent to the object side of the lens component having negative refractive power that is closest to the image side in the third lens group G3 is set to fLe2. Ensuring that the corresponding value of conditional expression (22) is not equal to or less than the lower limit thereof is advantageous for suppressing field curvature. Ensuring that the corresponding value of conditional expression (22) is not equal to or greater than the upper limit thereof is advantageous for shortening the overall length of the lens system. -2 <fLe2 / fLe1<-0.4 (22)

[0104] In order to obtain better characteristics, it is more preferable that the lower limit of conditional expression (22) be set to -1.7, even more preferably to -1.5, and even more preferably to -1.3.In order to obtain better characteristics, it is more preferable that the upper limit of conditional expression (22) be set to -0.45, even more preferably to -0.5, and even more preferably to -0.55.

[0105] In a configuration in which the imaging lens includes an image stabilization group, it is preferable that the imaging lens satisfy the following conditional expression (23). Here, the focal length of the image stabilization group is taken as fIS. By ensuring that the corresponding value of conditional expression (23) is not below the lower limit, the refractive power of the image stabilization group does not become too strong, which is advantageous for suppressing performance changes during image blur correction. By ensuring that the corresponding value of conditional expression (23) is not above the upper limit, the refractive power of the image stabilization group does not become too weak, which makes it possible to shorten the amount of movement of the image stabilization group during image blur correction, which is advantageous for reducing the weight and diameter of the optical system. -4 <f3 / fIS<-0.6 (23)

[0106] In order to obtain better characteristics, the lower limit of conditional expression (23) should preferably be set to -3.8, more preferably to -3.4, and even more preferably to -3.2.In order to obtain better characteristics, the upper limit of conditional expression (23) should preferably be set to -0.8, more preferably to -1, and even more preferably to -1.2.

[0107] It is preferable that the imaging lens satisfy the following conditional expression (24). Here, the focal length of the lens component closest to the object in the third lens group G3 is set to f3F1. By ensuring that the corresponding value of conditional expression (24) is not below the lower limit, the negative refractive power of the lens component closest to the object in the third lens group G3 does not become too strong, which is advantageous for shortening the overall length of the lens system. By ensuring that the corresponding value of conditional expression (24) is not above the upper limit, the positive refractive power of the lens component closest to the object in the third lens group G3 does not become too strong, which is advantageous for correcting spherical aberration. -2 <f3 / f3F1<2 (24)

[0108] In order to obtain better characteristics, it is more preferable that the lower limit of conditional expression (24) be set to -1, even more preferably to -0.8, and even more preferably to -0.45.In order to obtain better characteristics, it is more preferable that the upper limit of conditional expression (24) be set to 1.8, even more preferably to 1.7, and even more preferably to 1.6.

[0109] It is preferable that the imaging lens satisfy the following conditional expression (25). Here, the Abbe number based on the d-line of the positive lens in the third lens group G3 that is closest to the object is set to ν3p. Ensuring that the corresponding value of conditional expression (25) is not equal to or smaller than the lower limit thereof is advantageous for good correction of longitudinal chromatic aberration. Ensuring that the corresponding value of conditional expression (25) is not equal to or larger than the upper limit thereof increases the availability of materials, allowing the use of materials that are easier to manufacture. 55<ν3p<105 (25)

[0110] In order to obtain better characteristics, it is more preferable that the lower limit of conditional formula (25) be set to 60, even more preferably to 63, and even more preferably to 65. In order to obtain better characteristics, it is more preferable that the upper limit of conditional formula (25) be set to 100, even more preferably to 97, and even more preferably to 95.

[0111] 1 is merely an example, and various modifications are possible without departing from the spirit of the technology of the present disclosure. For example, the number of lenses included in each group and the number of focusing groups included in the imaging lens may be different from those in the example of FIG. 1. Furthermore, the configuration of lenses included in each lens group may also be different from those in the example of FIG. 1.

[0112] The above-described preferred and possible configurations, including those relating to the conditional expressions, can be arbitrarily combined, and are preferably selectively adopted as appropriate according to the required specifications.

[0113] As an example, a preferred embodiment of the present disclosure is an imaging lens that includes, in order from the object side to the image side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power, wherein at least the second lens group G2 moves along the optical axis Z during focusing, the second lens group G2 is the group closest to the object among the groups that move during focusing, the first lens group G1 includes two positive lenses in succession from the most object side to the image side, and when one lens component is represented by a single lens or a pair of cemented lenses, the third lens group G3 includes a lens component having negative refractive power that is closest to the image side, and satisfies the above conditional expressions (1) and (2).

[0114] Next, examples of the imaging lens of the present disclosure will be described with reference to the drawings. The reference symbols assigned to the lens groups and lenses in the cross-sectional views of each example are used independently for each example to avoid cluttering the explanations and drawings due to an increase in the number of digits in the reference symbols. Therefore, even if common reference symbols are assigned in drawings of different examples, this does not necessarily mean that the configuration is the same.

[0115] [Example 1] A cross-sectional view of the configuration of the imaging lens of Example 1 is shown in Figure 1, and since the illustration method and configuration are as described above, some overlapping explanations will be omitted here. The imaging lens of Example 1 comprises, in order from the object side to the image side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. The focusing group comprises the second lens group G2, and when focusing from an object at infinity to an object at a close distance, the second lens group G2 moves toward the image side along the optical axis Z. The image stabilization group comprises lenses L32 to L34.

[0116] For the imaging lens of Example 1, basic lens data is shown in Table 1, specifications are shown in Table 2, and variable surface spacings are shown in Table 3.

[0117] The table of basic lens data is written as follows. The "Sn" column shows the surface number, with the surface closest to the object being surface 1 and the numbers increasing by one as you move toward the image side. The "R" column shows the radius of curvature of each surface. The "D" column shows the surface spacing on the optical axis between each surface and its adjacent surface on the image side. The "Nd" column shows the refractive index of each lens relative to the d-line. The "νd" column shows the Abbe number of each lens based on the d-line.

[0118] In the basic lens data table, the sign of the radius of curvature of a surface with a convex shape facing the object side is positive, and the sign of the radius of curvature of a surface with a convex shape facing the image side is negative. The surface number and the phrase (St) are entered in the column for the surface number corresponding to the aperture stop St. The basic lens data table also shows the optical element PP. The value in the bottom column of the D column in the table is the distance between the surface closest to the image side in the table and the image plane Sim. The symbol DD[ ] is used to indicate the variable surface distance during focusing, and the surface number on the object side of this distance is entered in the [ ] in the surface distance column.

[0119] Table 2 shows the focal length (f) of the imaging lens, the back focal length (Bf) in air equivalent distance, the maximum F-number (Fno), and the maximum full-field angle (2ωm) based on the d-line. The [°] in the maximum full-field angle column indicates that the unit is degrees. Table 2 shows the values ​​when focused on an object at infinity.

[0120] In Table 3, the "infinity" column shows the variable surface spacing when focused on an object at infinity. The topmost column on the rightmost column shows the object distance of a close object, and the column below that shows the variable surface spacing when focused on this close object. For example, in Example 1, the object distance of the close object is 0.91 m (meters). Note that the "object distance" is the distance on the optical axis from the object to the lens surface closest to the object.

[0121] In the data in each table, degrees are used as the unit of angle, and mm (millimeters) are used as the unit of length other than the object distance, but since the optical system can be used with proportional enlargement or reduction, other appropriate units can also be used. Also, in each table shown below, values ​​are rounded to a predetermined number of digits.

[0122] [Table 1]

[0123] [Table 2]

[0124] [Table 3]

[0125] FIG. 4 shows aberration diagrams of the imaging lens of Example 1. From left to right, FIG. 4 shows spherical aberration, astigmatism, distortion, and lateral chromatic aberration. In FIG. 4, the upper row labeled "infinity" shows aberration diagrams of the imaging lens focused on an object at infinity, and the lower row labeled "close distance" shows aberration diagrams of the imaging lens focused on a close object, which corresponds to the object distance shown in the variable surface spacing table. In the spherical aberration diagrams, aberrations at the d-line, C-line, F-line, and g-line are shown by solid lines, long-dashed lines, short-dashed lines, and dash-dot lines, respectively. In the astigmatism diagrams, aberrations at the d-line in the sagittal direction are shown by solid lines, and aberrations at the d-line in the tangential direction are shown by short-dashed lines. In the distortion diagrams, aberrations at the d-line are shown by solid lines. In the lateral chromatic aberration diagram, aberrations for the C-line, F-line, and g-line are shown with long-dashed lines, short-dashed lines, and dash-dot lines, respectively. In the spherical aberration diagram, the maximum F-number value is shown after "FNo.=". In the other aberration diagrams, the maximum half angle of view value is shown after "ω=". The FNo. and ω in the upper diagram correspond to Fno and ωm in the conditional equations mentioned above, respectively.

[0126] The symbols, meanings, notation methods, and illustration methods of each data item related to the above-mentioned Example 1 are basically the same in the following Examples unless otherwise specified, and therefore, redundant explanations will be omitted below.

[0127] [Example 2] FIG. 5 shows a cross-sectional view of the configuration of the imaging lens of Example 2. The imaging lens of Example 2 comprises, in order from the object side to the image side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. The first lens group G1 comprises, in order from the object side to the image side, six lenses, L11 to L16, and an aperture stop St. The second lens group G2 comprises, in order from the object side to the image side, two lenses, L21 to L22. The third lens group G3 comprises, in order from the object side to the image side, six lenses, L31 to L36. The focusing group comprises the second lens group G2, which moves toward the image side along the optical axis Z when focusing from an object at infinity to a close-up object.

[0128] For the imaging lens of Example 2, basic lens data is shown in Table 4, specifications are shown in Table 5, variable surface spacing is shown in Table 6, and various aberration diagrams are shown in FIG.

[0129] [Table 4]

[0130] [Table 5]

[0131] [Table 6]

[0132] [Example 3] FIG. 7 shows a cross-sectional view of the configuration of the imaging lens of Example 3. The imaging lens of Example 3 comprises, in order from the object side to the image side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. The first lens group G1 comprises, in order from the object side to the image side, six lenses, L11 to L16, and an aperture stop St. The second lens group G2 comprises, in order from the object side to the image side, two lenses, L21 to L22. The third lens group G3 comprises, in order from the object side to the image side, six lenses, L31 to L36. The focusing group comprises the second lens group G2, which moves toward the image side along the optical axis Z when focusing from an object at infinity to a close-up object.

[0133] The imaging lens of Example 3 has an aspherical surface. For the imaging lens of Example 3, basic lens data is shown in Table 7, specifications are shown in Table 8, variable surface spacing is shown in Table 9, aspherical coefficients are shown in Table 10, and respective aberration diagrams are shown in Fig. 8.

[0134] In the basic lens data, aspherical surface numbers are marked with an *, and the paraxial radius of curvature is listed in the aspherical radius of curvature column. In Table 10, the Sn row shows the aspherical surface number, and the KA and Am (m = 4, 6, 8, 10, 12, 14, 16) rows show the aspherical coefficient values ​​for each aspherical surface. The "E±n" (n: integer) values ​​of the aspherical coefficients in Table 10 are expressed as "×10 ±n KA and Am are aspherical coefficients in the aspherical formula given below. Zd=C×h 2 / {1+(1-KA×C 2 ×h 2 ) 1 / 2}+ΣAm×h m however, Zd: Aspheric depth (length of the perpendicular line drawn from a point on the aspheric surface at height h to a plane perpendicular to the optical axis Z where the vertex of the aspheric surface is in contact) h: Height (distance from optical axis Z to lens surface) C: Reciprocal of paraxial radius of curvature KA, Am: aspherical coefficients In the aspherical formula, Σ means the summation over m. The above-mentioned method of indicating aspherical surfaces is basically the same in the following examples.

[0135] [Table 7]

[0136] [Table 8]

[0137] [Table 9]

[0138] [Table 10]

[0139] [Example 4] FIG. 9 shows a cross-sectional view of the configuration of the imaging lens of Example 4. The imaging lens of Example 4 comprises, in order from the object side to the image side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. The first lens group G1 comprises, in order from the object side to the image side, six lenses, L11 to L16, and an aperture stop St. The second lens group G2 comprises, in order from the object side to the image side, two lenses, L21 to L22. The third lens group G3 comprises, in order from the object side to the image side, six lenses, L31 to L36. The focusing group comprises the second lens group G2, which moves toward the image side along the optical axis Z when focusing from an object at infinity to a close-up object.

[0140] The imaging lens of Example 4 has an aspherical surface. For the imaging lens of Example 4, basic lens data is shown in Table 11, specifications are shown in Table 12, variable surface spacings are shown in Table 13, aspherical coefficients are shown in Table 14, and respective aberration diagrams are shown in Fig. 10.

[0141] [Table 11]

[0142] [Table 12]

[0143] [Table 13]

[0144] [Table 14]

[0145] [Example 5] FIG. 11 shows a cross-sectional view of the configuration of the imaging lens of Example 5. The imaging lens of Example 5 comprises, in order from the object side to the image side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. The first lens group G1 comprises, in order from the object side to the image side, six lenses, L11 to L16, and an aperture stop St. The second lens group G2 comprises, in order from the object side to the image side, two lenses, L21 to L22. The third lens group G3 comprises, in order from the object side to the image side, six lenses, L31 to L36. The focusing group comprises the second lens group G2, which moves toward the image side along the optical axis Z when focusing from an object at infinity to a close-up object.

[0146] For the imaging lens of Example 5, basic lens data is shown in Table 15, specifications are shown in Table 16, variable surface spacing is shown in Table 17, and various aberration diagrams are shown in FIG.

[0147] [Table 15]

[0148] [Table 16]

[0149] [Table 17]

[0150] [Example 6] A cross-sectional view of the configuration of the imaging lens of Example 6 is shown in Figure 13. The imaging lens of Example 6 consists of, in order from the object side to the image side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. The first lens group G1 consists of, in order from the object side to the image side, six lenses, lenses L11 to L16, and an aperture stop St. The second lens group G2 consists of, in order from the object side to the image side, two lenses, lenses L21 and L22. The third lens group G3 consists of, in order from the object side to the image side, six lenses, lenses L31 to L36. The focusing group consists of the second lens group G2, and when focusing from an object at infinity to a close-up object, the second lens group G2 moves toward the image side along the optical axis Z.

[0151] For the imaging lens of Example 6, basic lens data is shown in Table 18, specifications are shown in Table 19, variable surface spacing is shown in Table 20, and various aberration diagrams are shown in FIG.

[0152] [Table 18]

[0153] [Table 19]

[0154] [Table 20]

[0155] [Example 7] FIG. 15 shows a cross-sectional view of the configuration of the imaging lens of Example 7. The imaging lens of Example 7 comprises, in order from the object side to the image side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. The first lens group G1 comprises, in order from the object side to the image side, six lenses, L11 to L16, and an aperture stop St. The second lens group G2 comprises, in order from the object side to the image side, two lenses, L21 to L22. The third lens group G3 comprises, in order from the object side to the image side, seven lenses, L31 to L37. The focusing group comprises the second lens group G2, which moves toward the image side along the optical axis Z when focusing from an object at infinity to a close-up object.

[0156] For the imaging lens of Example 7, basic lens data is shown in Table 21, specifications are shown in Table 22, variable surface spacing is shown in Table 23, and each aberration diagram is shown in FIG.

[0157] [Table 21]

[0158] [Table 22]

[0159] [Table 23]

[0160] [Example 8] FIG. 17 shows a cross-sectional view of the configuration of the imaging lens of Example 8. The imaging lens of Example 8 comprises, in order from the object side to the image side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. The first lens group G1 comprises, in order from the object side to the image side, six lenses, L11 to L16, and an aperture stop St. The second lens group G2 comprises, in order from the object side to the image side, two lenses, L21 to L22. The third lens group G3 comprises, in order from the object side to the image side, six lenses, L31 to L36. The focusing group comprises the second lens group G2, which moves toward the image side along the optical axis Z when focusing from an object at infinity to a close-up object.

[0161] For the imaging lens of Example 8, basic lens data is shown in Table 24, specifications are shown in Table 25, variable surface spacing is shown in Table 26, and various aberration diagrams are shown in FIG.

[0162] [Table 24]

[0163] [Table 25]

[0164] [Table 26]

[0165] [Example 9] FIG. 19 shows a cross-sectional view of the configuration of the imaging lens of Example 9. The imaging lens of Example 9 comprises, in order from the object side to the image side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. The first lens group G1 comprises, in order from the object side to the image side, six lenses, L11 to L16, and an aperture stop St. The second lens group G2 comprises, in order from the object side to the image side, two lenses, L21 to L22. The third lens group G3 comprises, in order from the object side to the image side, ten lenses, L31 to L40. The focusing group comprises the second lens group G2, which moves toward the image side along the optical axis Z when focusing from an object at infinity to a close-up object. The image stabilization group comprises lenses L34 to L36.

[0166] For the imaging lens of Example 9, basic lens data is shown in Table 27, specifications are shown in Table 28, variable surface spacing is shown in Table 29, and various aberration diagrams are shown in FIG.

[0167] [Table 27]

[0168] [Table 28]

[0169] [Table 29]

[0170] [Example 10] FIG. 21 shows a cross-sectional view of the configuration of the imaging lens of Example 10. The imaging lens of Example 10 consists, in order from the object side to the image side, of a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. The first lens group G1 consists, in order from the object side to the image side, of six lenses, lenses L11 to L16, and an aperture stop St. The second lens group G2 consists, in order from the object side to the image side, of two lenses, lenses L21 and L22. The third lens group G3 consists, in order from the object side to the image side, of a 3A lens group G3A, a 3B lens group G3B, and a 3C lens group G3C. The 3A lens group G3A consists, in order from the object side to the image side, of six lenses, lenses L31 to L36. The 3B lens group G3B consists of a single lens, lens L37. The third-C lens group G3C consists of one lens, lens L38. The imaging lens of Example 10 includes two focusing groups, the second lens group G2 and the third-B lens group G3B. When focusing from an object at infinity to a close object, the second lens group G2 moves toward the image side along the optical axis Z, and the third-B lens group G3B moves toward the object side along the optical axis Z. The image stabilization group consists of lenses L32 to L34.

[0171] For the imaging lens of Example 10, basic lens data is shown in Table 30, specifications are shown in Table 31, variable surface spacing is shown in Table 32, and various aberration diagrams are shown in FIG.

[0172] [Table 30]

[0173] [Table 31]

[0174] [Table 32]

[0175] [Example 11] A cross-sectional view of the configuration of the imaging lens of Example 11 is shown in Figure 23. The imaging lens of Example 11 consists, in order from the object side to the image side, of a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. The first lens group G1 consists, in order from the object side to the image side, of six lenses, lenses L11 to L16, and an aperture stop St. The second lens group G2 consists, in order from the object side to the image side, of two lenses, lenses L21 and L22. The third lens group G3 consists, in order from the object side to the image side, of nine lenses, lenses L31 to L39. The focusing group consists of the second lens group G2, which moves toward the image side along the optical axis Z when focusing from an object at infinity to a close-up object. The image stabilization group consists of lenses L32 to L34.

[0176] For the imaging lens of Example 11, basic lens data is shown in Table 33, specifications are shown in Table 34, variable surface spacing is shown in Table 35, and various aberration diagrams are shown in FIG.

[0177] [Table 33]

[0178] [Table 34]

[0179] [Table 35]

[0180] [Example 12] FIG. 25 shows a cross-sectional view of the configuration of the imaging lens of Example 12. The imaging lens of Example 12 comprises, in order from the object side to the image side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. The first lens group G1 comprises, in order from the object side to the image side, six lenses, L11 to L16, and an aperture stop St. The second lens group G2 comprises, in order from the object side to the image side, two lenses, L21 to L22. The third lens group G3 comprises, in order from the object side to the image side, ten lenses, L31 to L40. The focusing group comprises the second lens group G2, which moves toward the image side along the optical axis Z when focusing from an object at infinity to a close-up object. The image stabilization group comprises lenses L33 to L35.

[0181] For the imaging lens of Example 12, basic lens data is shown in Table 36, specifications are shown in Table 37, variable surface spacing is shown in Table 38, and various aberration diagrams are shown in FIG.

[0182] [Table 36]

[0183] [Table 37]

[0184] [Table 38]

[0185] [Example 13] FIG. 27 shows a cross-sectional view of the configuration of the imaging lens of Example 13. The imaging lens of Example 13 comprises, in order from the object side to the image side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. The first lens group G1 comprises, in order from the object side to the image side, six lenses, L11 to L16, and an aperture stop St. The second lens group G2 comprises, in order from the object side to the image side, two lenses, L21 to L22. The third lens group G3 comprises, in order from the object side to the image side, ten lenses, L31 to L40. The focusing group comprises the second lens group G2, which moves toward the image side along the optical axis Z when focusing from an object at infinity to a close-up object. The image stabilization group comprises lenses L33 to L35.

[0186] For the imaging lens of Example 13, basic lens data is shown in Table 39, specifications are shown in Table 40, variable surface spacing is shown in Table 41, and various aberration diagrams are shown in FIG.

[0187] [Table 39]

[0188] [Table 40]

[0189] [Table 41]

[0190] Tables 42 to 44 show values ​​corresponding to conditional formulas (1) to (25) for the imaging lenses of Examples 1 to 13. The values ​​corresponding to the Examples shown in Tables 42 to 44 may be used as upper or lower limits for the conditional formulas to set preferred ranges for the conditional formulas.

[0191] [Table 42]

[0192] [Table 43]

[0193] [Table 44]

[0194] The imaging lenses of Examples 1 to 13 are constructed to be compact, yet have an F-number smaller than 3, a large image circle, and various aberrations are well corrected, maintaining high optical performance.

[0195] Next, an imaging device according to an embodiment of the present disclosure will be described. Fig. 29 and Fig. 30 show external views of a camera 30, which is an imaging device according to an embodiment of the present disclosure. Fig. 29 shows a perspective view of the camera 30 as seen from the front side, and Fig. 30 shows a perspective view of the camera 30 as seen from the rear side. The camera 30 is a so-called mirrorless digital camera, to which an interchangeable lens 20 can be removably attached. The interchangeable lens 20 is configured to include an imaging lens 1 according to an embodiment of the present disclosure housed in a lens barrel.

[0196] The camera 30 includes a camera body 31. A shutter button 32 and a power button 33 are provided on the top surface of the camera body 31. An operation unit 34, an operation unit 35, and a display unit 36 ​​are provided on the back surface of the camera body 31. The display unit 36 ​​can display a captured image and an image within the angle of view before the image was captured.

[0197] A photographic opening through which light from a subject enters is provided in the center of the front surface of camera body 31. A mount 37 is provided at a position corresponding to the photographic opening, and interchangeable lens 20 is attached to camera body 31 via mount 37.

[0198] An imaging element 38 is provided within the camera body 31. The imaging element 38 outputs an imaging signal corresponding to the subject image formed by the interchangeable lens 20. For example, a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) is used as the imaging element 38. A signal processing circuit (not shown) and a recording medium (not shown) are provided within the camera body 31. The signal processing circuit processes the imaging signal output from the imaging element 38 to generate an image. The recording medium is for recording the generated image. With the camera 30, it is possible to take still images or videos by pressing the shutter button 32, and the image data obtained by this shooting is recorded on the recording medium.

[0199] Although the technology of the present disclosure has been described above using embodiments and examples, the technology of the present disclosure is not limited to the above embodiments and examples and can be modified in various ways. For example, the radius of curvature, surface spacing, refractive index, Abbe number, aspherical coefficient, etc. of each lens are not limited to the values ​​shown in the above examples and can take other values.

[0200] Furthermore, the imaging device according to the embodiment of the present disclosure is not limited to the above example, and can take various forms, such as a camera other than a mirrorless type, a film camera, a video camera, and a security camera.

[0201] The following additional notes are provided regarding the above embodiments and examples. [Appendix 1] The lens comprises, in order from the object side to the image side, a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power; During focusing, at least the second lens group moves along the optical axis, the second lens group is the group closest to the object among the groups that move during focusing, the first lens group includes, in succession from the object side to the image side, two positive lens elements, When one lens element is a single lens or a pair of cemented lenses, the third lens group includes a lens component having negative refractive power and located closest to the image side, DG1 is the distance on the optical axis from the lens surface of the first lens group closest to the object side to the lens surface of the first lens group closest to the image side, DA is the distance on the optical axis from the lens surface of the first lens group closest to the object to the lens surface of the third lens group closest to the image when focused on an object at infinity, The maximum half angle of view when focused on an object at infinity is ωm. If the open F-number when focused on an object at infinity is Fno, 0.14 <DG1 / DA<0.5 (1) 0.02<(tanωm) / Fno<0.15 (2) An imaging lens that satisfies conditional expressions (1) and (2) expressed as follows: [Appendix 2] When the average value of the Abbe numbers of all the positive lenses included in the first lens group based on the d-line is ν1pave, 55<ν1pave<95 (3) The imaging lens according to claim 1, which satisfies conditional expression (3) expressed as follows: [Appendix 3] The imaging lens according to claim 1 or 2, wherein the first lens group includes, in succession from the object side to the image side, the two positive lenses, a positive lens, and a negative lens. [Appendix 4] 4. The imaging lens according to claim 1, wherein an aperture stop is disposed between a lens surface of the first lens group closest to the image side and a lens surface of the second lens group closest to the object side. [Appendix 5] The imaging lens according to any one of Supplementary Note 1 to Supplementary Note 4, wherein the first lens group includes only six lenses consisting of, in order from the object side to the image side, the two positive lenses, a positive lens, a negative lens, a positive lens, and a negative lens. [Appendix 6] The imaging lens according to any one of Supplementary Note 1 to Supplementary Note 5, wherein the second lens group includes at least one positive lens and at least one negative lens. [Appendix 7] The imaging lens according to Supplementary Note 6, wherein the second lens group is made up of a pair of cemented lenses formed by cementing together a positive lens and a negative lens. [Appendix 8] 8. The imaging lens according to claim 1, wherein a lens component having positive refractive power is disposed adjacent to the object side of the lens component having negative refractive power that is located closest to the image side in the third lens group. [Appendix 9] an aperture stop is disposed between the lens surface of the first lens group closest to the image side and the lens surface of the second lens group closest to the object side; a lens surface of the first lens group closest to the image side and a lens surface of the second lens group closest to the object side have a concave shape; The radius of curvature of the lens surface of the first lens group closest to the image side is RG1r, The radius of curvature of the lens surface of the second lens group closest to the object side is RG2f, When the focal length of the imaging lens is set to f when focused on an object at infinity, 0.7<(RG1r-RG2f) / f<4 (4) The imaging lens according to any one of Supplementary Note 1 to Supplementary Note 8, which satisfies conditional expression (4) expressed by the following formula: [Appendix 10] The back focus of the imaging lens in the air equivalent distance when focused on an object at infinity is Bf, When the focal length of the imaging lens is set to f when focused on an object at infinity, 0.7 <Bf / (f×tanωm)<3 (5) The imaging lens according to any one of Supplementary Note 1 to Supplementary Note 9, which satisfies conditional expression (5) shown below. [Appendix 11] The focal length of the imaging lens when focused on an object at infinity is f, When the focal length of the lens component having negative refractive power that is closest to the image side in the third lens group is fLe1, -3.2 <f / fLe1<-0.6 (6) The imaging lens according to any one of Supplementary Note 1 to Supplementary Note 10, which satisfies conditional expression (6) expressed by: [Appendix 12] The lateral magnification of the second lens group when focused on an object at infinity is β2, When the lateral magnification of the third lens group in a state where the lens is focused on an object at infinity is β3, 1.3<|(1-β2 2 )×β3 2 |<3.5 (7) 12. The imaging lens according to claim 1, which satisfies conditional expression (7) below. [Appendix 13] If TL is the sum of DA and the back focus of the imaging lens in terms of the air equivalent distance when focused on an object at infinity, then: 0.1 <DG1 / TL<0.3 (8) The imaging lens according to any one of Supplementary Note 1 to Supplementary Note 12, which satisfies conditional expression (8) shown below. [Appendix 14] When focused on an object at infinity, the height from the optical axis of the on-axis marginal ray on the lens surface closest to the image side of the first lens group is defined as H1r, When the height from the optical axis of the on-axis marginal ray on the lens surface of the first lens group closest to the object in a state where the lens is focused on an object at infinity is H1f, 0.5 <H1r / H1f<0.85 (9) The imaging lens according to any one of Supplementary Note 1 to Supplementary Note 13, which satisfies conditional expression (9) shown below. [Appendix 15] Den is the distance on the optical axis from the lens surface of the first lens group closest to the object to the paraxial entrance pupil position when focused on an object at infinity, When the focal length of the imaging lens is set to f when focused on an object at infinity, 0.2 <Den / f<0.5 (10) The imaging lens according to any one of Supplementary Note 1 to Supplementary Note 14, which satisfies conditional expression (10) expressed as follows: [Appendix 16] The focal length of the imaging lens when focused on an object at infinity is f, If the focal length of the first lens group is f1, then 1.2 <f / f1<2 (11) The imaging lens according to any one of Supplementary Note 1 to Supplementary Note 15, which satisfies conditional expression (11) shown below. [Appendix 17] The focal length of the imaging lens when focused on an object at infinity is f, If the focal length of the second lens group is f2, then -3 <f / f2<-1.3 (12) The imaging lens according to any one of Supplementary Note 1 to Supplementary Note 16, which satisfies conditional expression (12) expressed by the following formula: [Appendix 18] The focal length of the imaging lens when focused on an object at infinity is f, If the focal length of the third lens group is f3, 0.8 <f / f3<2.5 (13) The imaging lens according to any one of Supplementary Note 1 to Supplementary Note 17, which satisfies conditional expression (13) shown below. [Appendix 19] The distance on the optical axis from the lens surface of the second lens group closest to the object side to the lens surface of the second lens group closest to the image side is DG2, If TL is the sum of DA and the back focus of the imaging lens in terms of the air equivalent distance when focused on an object at infinity, then: 0.02 <DG2 / TL<0.1 (14) 19. The imaging lens according to any one of Supplementary Note 1 to Supplementary Note 18, which satisfies conditional expression (14) shown below. [Appendix 20] An imaging device comprising the imaging lens according to any one of Supplementary Note 1 to Supplementary Note 19. [Explanation of symbols]

[0202] 1 Imaging lens 2 On-axis luminous flux 2m axial marginal beam 3 Luminous flux 20 Interchangeable Lenses 30 Camera 31 Camera Body 32 Shutter button 33 Power button 34 Control section 35 Control section 36 Display section 37 Mount 38 Image sensor DA Distance Den distance DG1 distance DG2 distance DG3 Distance G1 First lens group G2 Second lens group G3 Third lens group G3A 3A lens group G3B 3B lens group G3C 3C lens group H1f height H1r height L11~L40 lenses PP optical components Sim image plane St aperture stop Z optical axis ωm Maximum half angle of view

Claims

1. The lens comprises, in order from the object side to the image side, a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power, During focusing, at least the second lens group moves along the optical axis, the second lens group is the group closest to the object among the groups that move during focusing, the first lens group includes, in succession from the most object side to the image side, two positive lenses, When one lens component is a single lens or a pair of cemented lenses, the third lens group includes a lens component having negative refractive power and located closest to the image side, DG1 is the distance on the optical axis from the lens surface of the first lens group closest to the object side to the lens surface of the first lens group closest to the image side, DA is the distance on the optical axis from the lens surface of the first lens group closest to the object side to the lens surface of the third lens group closest to the image side when focused on an object at infinity, The maximum half angle of view when focused on an object at infinity is ωm. When the open F-number when focused on an object at infinity is Fno, 0.14<DG1 / DA<0.5 (1) 0.02<(tanωm) / Fno<0.15 (2) An imaging lens that satisfies conditional expressions (1) and (2) expressed by the following formulas.

2. When the average value of the Abbe numbers of all the positive lenses included in the first lens group based on the d-line is ν1pave, 55<ν1pave<95 (3) 2. The imaging lens according to claim 1, which satisfies conditional expression (3) expressed as follows:

3. The imaging lens according to claim 1 , wherein the first lens group includes, in succession from the object side to the image side, the two positive lenses, a positive lens, and a negative lens.

4. 2. The imaging lens according to claim 1, wherein an aperture stop is disposed between the lens surface of the first lens group closest to the image side and the lens surface of the second lens group closest to the object side.

5. 2. The imaging lens according to claim 1, wherein the first lens group includes only six lenses consisting of, in order from the object side to the image side, the two positive lenses, a positive lens, a negative lens, a positive lens, and a negative lens.

6. The imaging lens according to claim 1 , wherein the second lens group includes at least one positive lens and at least one negative lens.

7. 7. The imaging lens according to claim 6, wherein the second lens group is made up of a pair of cemented lenses formed by cementing together a positive lens and a negative lens.

8. 2. The imaging lens according to claim 1, wherein a lens component having positive refractive power is disposed adjacent to the object side of the lens component having negative refractive power that is located closest to the image side in the third lens group.

9. an aperture stop is disposed between the lens surface of the first lens group closest to the image side and the lens surface of the second lens group closest to the object side; a lens surface of the first lens group closest to the image side and a lens surface of the second lens group closest to the object side have a concave shape; The radius of curvature of the lens surface of the first lens group closest to the image side is RG1r, The radius of curvature of the lens surface of the second lens group closest to the object is RG2f, When the focal length of the imaging lens is set to f when focused on an object at infinity, 0.7<(RG1r-RG2f) / f<4 (4) 2. The imaging lens according to claim 1, which satisfies conditional expression (4) expressed as follows:

10. The back focus of the imaging lens in the air equivalent distance when focused on an object at infinity is Bf, When the focal length of the imaging lens is set to f when focused on an object at infinity, 0.7<Bf / (f×tanωm)<3 (5) 2. The imaging lens according to claim 1, which satisfies conditional expression (5) expressed as follows:

11. The focal length of the imaging lens when focused on an object at infinity is f, When the focal length of the lens component having negative refractive power that is closest to the image side in the third lens group is fLe1, -3.2<f / fLe1<-0.6 (6) 2. The imaging lens according to claim 1, which satisfies conditional expression (6) expressed as follows:

12. The lateral magnification of the second lens group when focused on an object at infinity is β2, When the lateral magnification of the third lens group in a state where the lens is focused on an object at infinity is β3, １．３＜｜（１－β２ ２ ）×β３ ２ ｜＜３．５ （７） 2. The imaging lens according to claim 1, which satisfies conditional expression (7) expressed as follows:

13. When the sum of DA and the back focus of the imaging lens in the air equivalent distance when focused on an object at infinity is TL, 0.1<DG1 / TL<0.3 (8) 2. The imaging lens according to claim 1, which satisfies conditional expression (8) expressed as follows:

14. When the object at infinity is focused, the height of the axial marginal ray from the optical axis on the lens surface closest to the image side of the first lens group is defined as H1r. When the height of an axial marginal ray from the optical axis on the lens surface of the first lens group closest to the object in a state where the lens is focused on an object at infinity is H1f, 0.5<H1r / H1f<0.85 (9) 2. The imaging lens according to claim 1, which satisfies conditional expression (9) expressed as follows:

15. Den is the distance on the optical axis from the lens surface of the first lens group closest to the object to the paraxial entrance pupil position when focused on an object at infinity, When the focal length of the imaging lens is set to f when focused on an object at infinity, 0.2<Den / f<0.5 (10) 2. The imaging lens according to claim 1, which satisfies conditional expression (10) expressed as follows:

16. The focal length of the imaging lens when focused on an object at infinity is f, When the focal length of the first lens group is f1, 1.2<f / f1<2 (11) 2. The imaging lens according to claim 1, which satisfies conditional expression (11) expressed as follows:

17. The focal length of the imaging lens when focused on an object at infinity is f, When the focal length of the second lens group is f2, -3<f / f2<-1.3 (12) 2. The imaging lens according to claim 1, which satisfies conditional expression (12) expressed as follows:

18. The focal length of the imaging lens when focused on an object at infinity is f, When the focal length of the third lens group is f3, 0.8<f / f3<2.5 (13) 2. The imaging lens according to claim 1, which satisfies conditional expression (13) expressed as follows:

19. DG2 is the distance on the optical axis from the lens surface of the second lens group closest to the object side to the lens surface of the second lens group closest to the image side, When the sum of DA and the back focus of the imaging lens in the air equivalent distance when focused on an object at infinity is TL, 0.02<DG2 / TL<0.1 (14) 2. The imaging lens according to claim 1, which satisfies conditional expression (14) expressed as follows:

20. An imaging device comprising the imaging lens according to any one of claims 1 to 19.

Images