Imaging lens and camera device

Abstract

Provided is an imaging lens having a small F value and good correction of aberrations, and an imaging device having the imaging lens. The imaging lens successively has, from the most object side, a positive first lens group and a positive second lens group as lens groups. The interval between the first lens group and the second lens group changes during focusing. An aperture is disposed on the image side of the second lens from the object side. The combined refractive power of all lenses on the object side of the aperture is positive. The imaging lens includes, on the object side of the aperture, an LA positive lens and an LB positive lens that satisfy a predetermined conditional expression. The Abbe number of the LB positive lens is the largest among the Abbe numbers of all positive lenses on the object side of the aperture.

Description

Technical Field

[0001] This invention relates to an imaging lens and a camera device. Background Technology

[0002] Previously, imaging lenses described in Patent Documents 1 and 2 were known as imaging lenses that could be used in imaging devices such as digital cameras.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2015-141384

[0004] Patent Document 2: Japanese Patent Application Publication No. 2016-173398

[0005] In recent years, there has been a demand for a suitable imaging lens with a small F-number and good correction of various aberrations. Summary of the Invention

[0006] The present invention was made in view of the above circumstances, and its object is to provide a suitable imaging lens having a small F value and good correction of various aberrations, and a camera device having the imaging lens.

[0007] The imaging lens of the present invention comprises, sequentially from the object side to the image side, a first lens group with positive refractive power and a second lens group with refractive power as lens groups. During focusing, the interval between the first lens group and the second lens group changes, while the mutual intervals of all lenses in the first lens group and all lenses in the second lens group remain constant. The aperture is positioned closer to the image side than the second lens from the object side, and the combined refractive power of all lenses closer to the object side than the aperture is positive. The lens closer to the object side than the aperture includes at least one LA lens and at least one LB lens. The d-line reference dispersion coefficient of the LB lens is the largest among the d-line reference dispersion coefficients of all positive lenses closer to the object side than the aperture. When the refractive index of the LA positive lens relative to the d-line is set to NdA, the d-line reference dispersion coefficient of the LA lens is set to vdA, and the d-line reference dispersion coefficient of the LB positive lens is set to vdB, the imaging lens satisfies the following conditional equations (1), (2), and (3).

[0008] 1.86 < NdA < 2.2 (1)

[0009] 10 < v dA < 35 (2)

[0010] 57 < v dB < 105 (3)

[0011] Preferably, the imaging lens of the present invention satisfies at least one of the following conditional expressions (1-1), (2-1) and (3-1).

[0012] 1.88 < NdA < 2.15 (1-1)

[0013] 13.5<ν dA<31 (2-1)

[0014] 62 < ν dB < 92 (3-1)

[0015] Preferably, the first lens group includes at least two positive lenses and at least two negative lenses.

[0016] Preferably, the second lens group includes at least two positive lenses and at least two negative lenses.

[0017] Preferably, during focusing, the first lens group is fixed relative to the image plane, while the second lens group moves.

[0018] Preferably, only one lens group moves during focusing. In this case, preferably, only the second lens group moves during focusing.

[0019] Preferably, the first lens group includes at least two negative lenses. When the average value of the d-line dispersion coefficients of two negative lenses selected from the negative lenses included in the first lens group in ascending order of d-line dispersion coefficient is set as vdn1, the imaging lens of the present invention satisfies the following condition (4), and more preferably satisfies the following condition (4-1).

[0020] 15<ν dn1<28 (4)

[0021] 16<ν dn1<25 (4-1)

[0022] Preferably, during focusing, the first lens group is fixed relative to the image plane, and the first lens group includes at least one LA positive lens.

[0023] Preferably, when the sum of the distance on the optical axis from the lens surface closest to the object to the lens surface closest to the image, when focusing on an object at infinity, and the back focal length in terms of air-converted distance, is set to TL, the F-number of the imaging lens when focusing on an object at infinity is set to FNo, and the focal length of the imaging lens when focusing on an object at infinity is set to f, the imaging lens of the present invention satisfies the following conditional expression (5).

[0024] 1.5 < TL × FNo / f < 5 (5)

[0025] Preferably, the imaging lens of the present invention has only two lens groups as lens groups, including a first lens group that is fixed relative to the image plane when focusing and a second lens group that moves when focusing, from the object side to the image side; or it has only three lens groups as lens groups, including a first lens group that is fixed relative to the image plane when focusing, a second lens group that moves when focusing, and a third lens group that is fixed relative to the image plane when focusing, consisting of two or fewer lenses.

[0026] The second lens group can be configured as a lens group with positive refractive power.

[0027] Preferably, the first lens group includes at least three negative lenses.

[0028] Preferably, the second lens group includes at least two positive lenses and at least three negative lenses.

[0029] In the imaging lens of the present invention, when one lens component is set as a single lens or a combined lens, one lens component has negative refractive power and the other lens component has positive refractive power in the lens component closest to the object and the second lens component from the object side. When focusing on an object at infinity, the on-axis light beam emitted from the lens surface closest to the image side of the lens component with negative refractive power is divergent light.

[0030] Preferably, at least one of the lens closest to the object side and the second lens from the object side is a negative lens with a concave lens surface on the object side.

[0031] Preferably, the lens closest to the object is a negative lens.

[0032] Preferably, the imaging lens of the present invention comprises, sequentially from the side closest to the object, a single lens with negative refractive power, a single lens with positive refractive power, and a single lens with positive refractive power.

[0033] Preferably, the lens surface on the object side of the lens closest to the object is concave.

[0034] Preferably, the imaging lens of the present invention includes at least one LC positive lens on the object side closer to the aperture. The LC positive lens is a positive lens that has the largest or second largest d-line reference dispersion coefficient among all positive lenses on the object side closer to the aperture. When the d-line reference dispersion coefficient of the LC positive lens is set to v dC, the following condition (6) is satisfied.

[0035] 57<v dC<102 (6)

[0036] Preferably, when the minimum refractive index of all positive lenses closer to the object side than the aperture relative to the d-line is set to Ndfm, the imaging lens of the present invention satisfies the following condition (7).

[0037] 1.46 < Ndfm < 1.72 (7)

[0038] Preferably, the aperture is configured within a lens group that is fixed relative to the image plane during focusing, or the aperture is configured between lens groups.

[0039] Preferably, the aperture is positioned between the first lens group and the second lens group. During focusing, the first lens group and the aperture are fixed relative to the image plane, while the second lens group moves.

[0040] Preferably, the second lens group moves during focusing, and the number of lenses included in the second lens group is 7 or less, more preferably 6 or less, and even more preferably 5 or less.

[0041] Preferably, the number of lenses arranged on the object side closer to the aperture is 8 or less, more preferably 7 or less.

[0042] Preferably, the imaging lens of the present invention includes 13 or fewer lenses, more preferably 12 or fewer lenses.

[0043] Preferably, the imaging lens of the present invention includes at least two positive lenses on the image side closer to the aperture, and satisfies the following condition (8) when the average refractive index of all positive lenses on the image side closer to the aperture with respect to the d line is set as Ndpr.

[0044] 1.77 < Ndpr < 2.15 (8)

[0045] Preferably, the second lens group moves during focusing, and the second lens group includes at least one positive lens. When the average refractive index of all positive lenses in the second lens group relative to the d line is set to Nd2p, the imaging lens of the present invention satisfies the following condition (9).

[0046] 1.7 < Nd2p < 2.2 (9)

[0047] Preferably, the second lens group moves during focusing, and the second lens group includes at least two joint lenses.

[0048] Preferably, three positive lenses are arranged consecutively within the first lens group. More preferably, four positive lenses are arranged consecutively within the first lens group.

[0049] Preferably, when the focal length of the first lens group is set to f1 and the focal length of the imaging lens in the state of focusing on an object at infinity is set to f, the imaging lens of the present invention satisfies the following conditional expression (10).

[0050] 0.5 < f1 / f < 3.5 (10)

[0051] Preferably, when the maximum half angle of view of the imaging lens when focusing on an object at infinity is set to ωmax and the F-value of the imaging lens when focusing on an object at infinity is set to FNo, the imaging lens of the present invention satisfies the following conditional expression (11).

[0052] 1.8<1 / {tan(ωmax)×FNo}<4.5 (11)

[0053] Preferably, the second lens group moves during focusing. When the focal length of the second lens group is set to f2 and the focal length of the imaging lens in the state of focusing on an object at infinity is set to f, the imaging lens of the present invention satisfies the following conditional expression (12).

[0054] 0.3 < |f2| / f < 2.2 (12)

[0055] Preferably, when the focal length of the first lens group is set to f1 and the focal length of the second lens group is set to f2, the imaging lens of the present invention satisfies the following conditional expression (13).

[0056] 1 < f1 / f2 < 5 (13)

[0057] Preferably, when the second lens group moves during focusing, the lateral magnification of the second lens group when focusing on an object at infinity is set to β2, the combined lateral magnification of all lenses that are more image-side than the second lens group when focusing on an object at infinity with a lens positioned more image-side than the second lens group is set to βr, and βr is not set to 1 when a lens is not positioned more image-side than the second lens group, the imaging lens of the present invention satisfies the following conditional expression (14).

[0058] 0.3 < |(1-β2) 2 )×βr 2 |<1.5 (14)

[0059] Preferably, when the distance on the optical axis from the lens surface closest to the object to the aperture is set to Tf when the object is focused at infinity, and the sum of the distance on the optical axis from the lens surface closest to the object to the lens surface closest to the image and the back focal length in air-converted distance is set to TL, the imaging lens of the present invention satisfies the following conditional expression (15).

[0060] 0.2 < Tf / TL < 0.65 (15)

[0061] Preferably, the first lens group sequentially includes a first unit with negative refractive power and a second unit with positive refractive power, which is separated from the first unit by the maximum air gap on the optical axis within the first lens group. The second unit includes a single lens or a combined lens. When the focal length of the imaging lens in the state of focusing on an object at infinity is set to f, and the combined focal length of all lenses in the imaging lens in the state of focusing on an object at infinity that are closer to the image side than the second unit is set to fm, the imaging lens of the present invention satisfies the following conditional expression (16).

[0062] 0.7 < f / fm < 0.98 (16)

[0063] Preferably, when the first lens group includes the first unit and the second unit described above, the first unit includes a negative lens and the second unit includes a positive lens.

[0064] Preferably, when the partial dispersion ratio between the g line and the F line of the LA positive lens is set to θgFA, the imaging lens of the present invention satisfies the following conditional expression (17).

[0065] 0.01<θgFA+0.00162×v dA-0.64159<0.06 (17)

[0066] Preferably, when the partial dispersion ratio between the g line and the F line of the LB positive lens is set to θgFB, the imaging lens of the present invention satisfies the following conditional expression (18).

[0067] 0.01<θgFB+0.00162×v dB-0.64159<0.05 (18)

[0068] Preferably, the first lens group includes at least two negative lenses. When the average value of the chromatic dispersion coefficients of two negative lenses selected in the first lens group in ascending order of chromatic dispersion coefficients based on the d-line is set as vdn1, and the average value of the partial dispersion ratios between the g-line and F-line of two negative lenses selected in the first lens group in ascending order of chromatic dispersion coefficients based on the d-line is set as θgFn1, the imaging lens of the present invention satisfies the following conditional expression (19).

[0069] 0.01<θgFn1+0.00162×v dn1-0.64159<0.05 (19)

[0070] The camera device of the present invention includes the imaging lens of the present invention.

[0071] In addition, the terms "including" and "including" in this specification mean that, in addition to the constituent elements listed, it may also include lenses that do not substantially have refractive power, as well as optical elements other than lenses such as apertures, filters and cover glass, and mechanism parts such as lens flanges, lens barrels, imaging elements and hand shaking correction mechanisms.

[0072] In addition, in this specification, "a group with positive refractive power" means that the group as a whole has positive refractive power. Similarly, "a group with negative refractive power" means that the group as a whole has negative refractive power. "Lens with positive refractive power," "positive lens," and "positive lens" have the same meaning. "Lens with negative refractive power," "negative lens," and "negative lens" have the same meaning. "Single lens" refers to a single, unjoined lens.

[0073] A "lens group" is not limited to a structure comprising multiple lenses; it can also be a structure comprising only a single lens. A compound aspherical lens (a lens in which a spherical lens and an aspherical film formed on the spherical lens are integrated to function as a single aspherical lens) is used as a single lens and not considered a combined lens. Unless otherwise specified, the sign of the refractive power, the surface shape of the lens surface, and the radius of curvature associated with lenses including aspherical surfaces are considered in the paraxial region. Regarding the sign of the radius of curvature, the radius of curvature of the surface with a convex shape facing the object is signified positive, and the radius of curvature of the surface with a convex shape facing the image is signified negative.

[0074] In this specification, "the entire system" refers to "the imaging lens". In this specification, "the object-side of the entire system" is also simply referred to as "the object-side". Furthermore, "in order from the object side to the image side" related to the arrangement order is also simply referred to as "in order from the object side". The "focal length" used in the conditional formula is the paraxial focal length. The value of "FNo" used in the conditional formula is the value of the open F-number. The "back focal length" is the distance on the optical axis from the lens surface closest to the image side to the image-side focal point of the imaging lens. The value used in the conditional formula is the value with the d-line as a reference when focusing on an object at infinity. When the refractive indices of a lens relative to the g-line, F-line, and C-line are set to Ng, NF, and NC, respectively, the partial dispersion ratio θgF between the g-line and F-line of the lens is defined by θgF = (Ng - NF) / (NF - NC). The “d-line,” “C-line,” “F-line,” and “g-line” mentioned in this specification are bright lines. The wavelength of the d-line is 587.56 nm, the wavelength of the C-line is 656.27 nm, the wavelength of the F-line is 486.13 nm, and the wavelength of the g-line is 435.84 nm.

[0075] Invention Effects

[0076] According to the present invention, it is possible to provide a suitable imaging lens with a small F-value and good correction of various aberrations, and an imaging device equipped with the imaging lens. Attached Figure Description

[0077] Figure 1 This is a cross-sectional view showing the structure and beam of an imaging lens (the imaging lens of Embodiment 1) according to one embodiment.

[0078] Figure 2 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the imaging lens in Example 1.

[0079] Figure 3 This is a lateral aberration diagram of the imaging lens in Example 1.

[0080] Figure 4This is a cross-sectional view showing the structure of the imaging lens and the light beam of Embodiment 2.

[0081] Figure 5 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the imaging lens in Example 2.

[0082] Figure 6 This is a lateral aberration diagram of the imaging lens in Example 2.

[0083] Figure 7 This is a cross-sectional view showing the structure of the imaging lens and the light beam of Embodiment 3.

[0084] Figure 8 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the imaging lens in Example 3.

[0085] Figure 9 This is a lateral aberration diagram of the imaging lens in Example 3.

[0086] Figure 10 This is a cross-sectional view showing the structure of the imaging lens and the beam of Embodiment 4.

[0087] Figure 11 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the imaging lens in Example 4.

[0088] Figure 12 This is a lateral aberration diagram of the imaging lens in Example 4.

[0089] Figure 13 This is a cross-sectional view showing the structure of the imaging lens and the beam of Embodiment 5.

[0090] Figure 14 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the imaging lens in Example 5.

[0091] Figure 15 This is a lateral aberration diagram of the imaging lens in Example 5.

[0092] Figure 16 This is a cross-sectional view showing the structure of the imaging lens and the beam of Embodiment 6.

[0093] Figure 17 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the imaging lens in Example 6.

[0094] Figure 18 This is a lateral aberration diagram of the imaging lens in Example 6.

[0095] Figure 19 This is a cross-sectional view showing the structure of the imaging lens and the light beam of Embodiment 7.

[0096] Figure 20 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the imaging lens in Example 7.

[0097] Figure 21 This is a lateral aberration diagram of the imaging lens in Example 7.

[0098] Figure 22 This is a cross-sectional view showing the structure of the imaging lens and the light beam of Embodiment 8.

[0099] Figure 23 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the imaging lens in Example 8.

[0100] Figure 24 This is a lateral aberration diagram of the imaging lens in Example 8.

[0101] Figure 25 This is a cross-sectional view showing the structure of the imaging lens and the beam of Embodiment 9.

[0102] Figure 26 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the imaging lens in Example 9.

[0103] Figure 27 This is a lateral aberration diagram of the imaging lens in Example 9.

[0104] Figure 28 This is a cross-sectional view showing the structure of the imaging lens and the light beam of Embodiment 10.

[0105] Figure 29 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the imaging lens of Example 10.

[0106] Figure 30 This is a lateral aberration diagram of the imaging lens of Example 10.

[0107] Figure 31 This is a cross-sectional view showing the structure of the imaging lens and the light beam of Embodiment 11.

[0108] Figure 32 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the imaging lens in Example 11.

[0109] Figure 33 This is a lateral aberration diagram of the imaging lens in Example 11.

[0110] Figure 34 This is a cross-sectional view showing the structure of the imaging lens and the beam of Embodiment 12.

[0111] Figure 35These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the imaging lens in Example 12.

[0112] Figure 36 This is a lateral aberration diagram of the imaging lens in Example 12.

[0113] Figure 37 This is a cross-sectional view showing the structure of the imaging lens and the beam of Embodiment 13.

[0114] Figure 38 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the imaging lens in Example 13.

[0115] Figure 39 This is a lateral aberration diagram of the imaging lens in Example 13.

[0116] Figure 40 This is a cross-sectional view showing the structure of the imaging lens and the beam of Embodiment 14.

[0117] Figure 41 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the imaging lens in Example 14.

[0118] Figure 42 This is a lateral aberration diagram of the imaging lens in Example 14.

[0119] Figure 43 This is a cross-sectional view showing the structure and beam of the imaging lens of Embodiment 15.

[0120] Figure 44 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the imaging lens in Example 15.

[0121] Figure 45 This is a lateral aberration diagram of the imaging lens in Example 15.

[0122] Figure 46 This is a cross-sectional view showing the structure of the imaging lens and the beam of Embodiment 16.

[0123] Figure 47 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the imaging lens in Example 16.

[0124] Figure 48 This is a lateral aberration diagram of the imaging lens in Example 16.

[0125] Figure 49 This is a cross-sectional view showing the structure of the imaging lens and the beam of Embodiment 17.

[0126] Figure 50 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the imaging lens in Example 17.

[0127] Figure 51 This is a lateral aberration diagram of the imaging lens in Example 17.

[0128] Figure 52 This is a cross-sectional view showing the structure of the imaging lens and the light beam of Embodiment 18.

[0129] Figure 53 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the imaging lens of Example 18.

[0130] Figure 54 This is a lateral aberration diagram of the imaging lens of Example 18.

[0131] Figure 55 This is a cross-sectional view showing the structure of the imaging lens and the beam of Embodiment 19.

[0132] Figure 56 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the imaging lens of Example 19.

[0133] Figure 57 This is a lateral aberration diagram of the imaging lens of Example 19.

[0134] Figure 58 This is a cross-sectional view showing the structure of the imaging lens and the beam of Embodiment 20.

[0135] Figure 59 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the imaging lens of Example 20.

[0136] Figure 60 This is a lateral aberration diagram of the imaging lens of Example 20.

[0137] Figure 61 This is a perspective view of the front side of a camera device according to one embodiment.

[0138] Figure 62 This is a perspective view of the rear side of a camera device according to one embodiment. Detailed Implementation

[0139] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Figure 1 This is a diagram showing the structure of an imaging lens according to an embodiment of the present invention, including a cross-section of the optical axis Z. Figure 1 The example shown corresponds to the imaging lens of Embodiment 1, which will be described later. Figure 1 In the image, the left side is the object side and the right side is the image side, showing the state of focusing on an object at infinity. It also shows the on-axis beam 2 and the beam 3 with the maximum angle of view.

[0140] exist Figure 1 The illustration shows an example assuming an imaging lens is used in a camera device, with a parallel flat optical component PP positioned between the imaging lens and the image plane (Sim). The optical component PP is assumed to be a component such as various filters and / or cover glass. These filters include, for example, low-pass filters, infrared cutoff filters, and filters that cut off specific wavelength regions. The optical component PP may be a component without refractive power, or it may be a structure in which the optical component PP is omitted.

[0141] The imaging lens of this invention is a fixed-focus lens, which comprises, sequentially along the optical axis Z from the object side to the image side, a first lens group G1 with positive refractive power and a second lens group G2 with refractive power. Furthermore, the aperture St is positioned further to the image side than the second lens from the object side. By setting the refractive power of the first lens group G1 to positive, it is advantageous to shorten the overall length of the lens.

[0142] The imaging lens of the present invention may further include a lens group on the image side of the second lens group G2. Furthermore, in this specification, "lens group" refers to a component of the imaging lens, which includes at least one lens separated by an air gap that changes during focusing. During focusing, the lens group is moved or fixed as a unit, and the spacing between the lenses within a lens group remains constant.

[0143] As an example, Figure 1 The imaging lens shown includes, from the object side, a first lens group G1, an aperture St, a second lens group G2, and a third lens group G3. Figure 1 The aperture stop St shown indicates its position on the optical axis, not its shape. Figure 1 In the imaging lens of the present invention, as an example, the first lens group G1 includes seven lenses L1a to L1g sequentially from the object side, the second lens group G2 includes five lenses L2a to L2e sequentially from the object side, and the third lens group G3 includes one lens L3a. However, in the imaging lens of the present invention, the number of lenses constituting each lens group may also be different. Figure 1 The number of examples shown.

[0144] In the imaging lens of the present invention, the configuration is such that when focusing from an object at infinity to a closer object, the interval between the first lens group G1 and the second lens group G2 changes, while the mutual intervals of all lenses in the first lens group and all lenses in the second lens group remain constant. Here, "constant mutual intervals during focusing" means that the mutual intervals remain unchanged during focusing. By setting the structure such that the intervals between the lens groups change during focusing, compared to a structure where the entire imaging lens moves as a whole for focusing, variations in image plane curvature during focusing can be suppressed. Here, "moves as a whole" means moving simultaneously in the same direction by the same amount.

[0145] exist Figure 1 In an imaging lens, as an example, when focusing from an object at infinity to the nearest object, the first lens group G1 and the third lens group G3 are fixed relative to the image plane Sim, while the second lens group G2 moves along the optical axis Z towards the object side. That is, in Figure 1 In the imaging lens, the lens group that moves during focusing (hereinafter referred to as the focusing lens group) includes the second lens group G2. Figure 1 The horizontal left arrow on the lower side of the second lens group G2 indicates that the second lens group G2 moves towards the object side when focusing from an object at infinity to the nearest object.

[0146] The imaging lens is configured such that the combined refractive power of all lenses located on the object side, beyond the aperture St, is positive. Furthermore, the imaging lens is configured to include at least one LA positive lens and at least one LB lens on the object side, beyond the aperture St. The LA lens is a positive lens positioned on the object side beyond the aperture St, satisfying the following conditions (1) and (2) when the refractive index of the LA positive lens relative to the d-line is set to NdA and the dispersion coefficient of the LA positive lens relative to the d-line reference is set to vdA.

[0147] 1.86 < NdA < 2.2 (1)

[0148] 10 < v dA < 35 (2)

[0149] The LB lens is a positive lens that is positioned closer to the object than the aperture St, and whose d-line reference dispersion coefficient is the largest among all positive lenses closer to the object than the aperture St, and satisfies the following condition (3). Here, the d-line reference dispersion coefficient of the LB positive lens LB is set as v dB.

[0150] 57 < v dB < 105 (3)

[0151] exist Figure 1 In the example, lens L1c corresponds to lens LA, and lens L1b corresponds to lens LB.

[0152] By setting it to not be below the lower limit of condition (1), the absolute value of the lens's radius of curvature will not become too small, thus suppressing the generation of spherical aberration. By setting it to not be above the upper limit of condition (1), the lens's specific gravity will not become too large, thus facilitating lightweight design.

[0153] By setting it to not be below the lower limit of condition (2), it is beneficial to properly correct primary color differences. By setting it to not be above the upper limit of condition (2), it is beneficial to properly correct secondary color differences. By satisfying condition (2), it is beneficial to properly correct both primary and secondary color differences.

[0154] By setting it to not be below the lower limit of condition (3), it is beneficial to correct chromatic aberration well, especially on-axis chromatic aberration. By setting it to not be above the upper limit of condition (3), the refractive index of the LB positive lens can be prevented from becoming too low. If a positive lens is made of a material with a low refractive index, spherical aberration and coma are easily generated, but by setting it to not be above the upper limit of condition (3), the generation of spherical aberration and coma can be suppressed.

[0155] In the imaging lens of the present invention, a high-refractive-index and high-dispersion LA lens LA, satisfying conditions (1) and (2), is disposed on the object side closer than the aperture St, while a low-dispersion LB positive lens LB, satisfying condition (3), is also disposed. The multiple lenses disposed on the object side closer than the aperture St have positive refractive power as a whole. By disposing of the LA positive lens LA, which is made of a material satisfying conditions (1) and (2), a secondary chromatic aberration correction effect can be obtained. By controlling the amount of chromatic aberration generated by the LA lens LA and the LB positive lens LB, a balance between primary and secondary chromatic aberration can be maintained. Furthermore, by disposing of the positive lens, which is made of a high-refractive-index material satisfying condition (1), the absolute value of the radius of curvature of each positive lens can be prevented from becoming too small. As a result, chromatic aberration and monochromatic aberrations such as spherical aberration and coma can be easily and evenly corrected.

[0156] To obtain better characteristics, the LA lens LA preferably satisfies at least one of the following conditions (1-1), (1-2), (2-1), (2-2) and (2-3).

[0157] 1.88 < NdA < 2.15 (1-1)

[0158] 1.91 < NdA < 2.15 (1-2)

[0159] 13.5 < v dA < 31 (2-1)

[0160] 14<ν dA<28 (2-2)

[0161] 14.5 < v dA < 22 (2-3)

[0162] To obtain better characteristics, the LB positive lens preferably satisfies the following condition (3-1), and more preferably satisfies the following condition (3-2).

[0163] 62 < v dB < 92 (3-1)

[0164] 66 < v dB < 88 (3-2)

[0165] Furthermore, when the dispersion coefficient of the d-line reference of the LA lens LA is set to v dA, and the partial dispersion ratio between the g-line and F-line of the LA lens LA is set to θgFA, it is preferable to satisfy the following conditional expression (17). By setting it to not be below the lower limit of conditional expression (17), insufficient secondary chromatic aberration correction can be suppressed. By setting it to not be above the upper limit of conditional expression (17), excessive secondary chromatic aberration correction can be suppressed. To obtain even better characteristics, it is more preferable to satisfy the following conditional expression (17-1).

[0166] 0.01<θgFA+0.00162×v dA-0.64159<0.06 (17)

[0167] 0.015<θgFA+0.00162×v dA-0.64159<0.055 (17-1)

[0168] The condition (17) is θgFA+0.00162×v dA-0.64159, which is expressed by the following formula: ΔθgFA.

[0169] ΔθgFA=θgFA-(-0.00162×v dA+0.64159)

[0170] ΔθgFA represents the anomalous dispersion of the material used in the LA positive lens LA; the larger the value, the higher the anomalous dispersion. Anomalous dispersion can be considered using an orthogonal coordinate system with the dispersion coefficient vd (horizontal axis as reference to the d-line) and the partial dispersion ratio θgF (vertical axis as reference to the g-line and F-line as reference to the y-line). In this orthogonal coordinate system, the straight line passing through the points (vd, θgF) = (60.49, 0.5436) and (vd, θgF) = (36.26, 0.5828) serves as the baseline. The deviation from this baseline indicates the degree of anomalous dispersion. ΔθgFA represents the deviation of the partial dispersion ratio from this baseline. Furthermore, the definition of the above deviation is based on the definition of anomalous dispersion by OHARAIN C.

[0171] Similarly, when the partial dispersion ratio between the g-line and F-line of the LB lens LB is set to θgFB, it is preferable to satisfy the following conditional expression (18). θgFB + 0.00162 × v dA - 0.64159 in conditional expression (18) represents the anomalous dispersion of the material used for the LB positive lens LB; the larger this value, the higher the anomalous dispersion. By setting it to not be below the lower limit of conditional expression (18), chromatic aberration, especially on-axis chromatic aberration, is easily corrected. By setting it to not be above the upper limit of conditional expression (18), materials other than low-refractive-index materials can be selected, thus preventing the absolute value of the lens's radius of curvature from becoming too small. Therefore, spherical aberration and coma are easily corrected. By satisfying conditional expression (18), chromatic aberration, spherical aberration, and coma are easily and evenly corrected. To obtain even better characteristics, it is more preferable to satisfy the following conditional expression (18-1).

[0172] 0.01<θgFB+0.00162×ν dB-0.64159<0.05 (18)

[0173] 0.012<θgFB+0.00162×v dB-0.64159<0.035 (18-1)

[0174] Hereinafter, other preferred structures and achievable structures of the imaging lens of the present invention will be described. Preferably, during focusing, the first lens group G1 is fixed relative to the image plane Sim, and the first lens group G1 includes at least one LA positive lens LA. The reason is as follows: If an LA positive lens LA made of a high refractive index and highly dispersed material is arranged in the focusing lens group, the variation of chromatic aberration and spherical aberration is likely to increase during focusing. Therefore, it is preferable to arrange it in the first lens group that does not move during focusing. Alternatively, if the LA lens LA is arranged in the focusing lens group, in order to counteract the aberrations generated by the LA positive lens LA, a negative lens needs to be further arranged in the focusing lens group, which would lead to a larger focusing lens group. Considering the above, more preferably, during focusing, the first lens group G1 is fixed relative to the image plane Sim, and the first lens group G1 includes all LA lenses LA.

[0175] Preferably, the imaging lens includes at least one LC lens LC on the object side, which is closer to the aperture St than the aperture St. The LC lens LC is a positive lens that is positioned on the object side, has the largest or second largest d-line reference dispersion coefficient among all positive lenses on the object side, and satisfies the following condition (6). Here, the d-line reference dispersion coefficient of the LC positive lens LC is set as vdC.

[0176] 57<v dC<102 (6)

[0177] Figure 1The image shows an example where lens L1d corresponds to an LC positive lens LC.

[0178] By setting it to not be below the lower limit of condition (6), chromatic aberration, especially on-axis chromatic aberration, can be well corrected. By setting it to not be above the upper limit of condition (6), the refractive index of the LC positive lens LC will not become too low, thus suppressing the generation of spherical aberration and coma. By having an LB lens LB made of a low-dispersion material satisfying condition (3) and an LC positive lens LC made of a low-dispersion material satisfying condition (6) on the object side of the imaging lens, which is closer to the aperture St than the aperture St, chromatic aberration and spherical aberration can be well corrected. Compared with a structure where the positive lens made of a low-dispersion material is only an LB positive lens LB, the refractive power of the LB positive lens LB can be reduced in a structure with both an LB positive lens LB and an LC positive lens LC. As a result, the absolute value of the radius of curvature of the LB lens LB will not become too small, thus suppressing the generation of spherical aberration. Furthermore, based on the refractive index characteristics and dispersion coefficient characteristics of the optical material, the refractive index of the LC lens LC can be made higher than that of the LB lens LB. Therefore, when the imaging lens has two positive lenses made of low-dispersion material closer to the object side than the aperture St, compared with the structure where both lenses are LB lenses, the absolute value of the radius of curvature of the two positive lenses can be increased in the structure where one LB positive lens is used and one LC positive lens is used, which is beneficial to suppressing the generation of spherical aberration.

[0179] To obtain better characteristics, the LC positive lens preferably satisfies the following condition (6-1), and more preferably satisfies the following condition (6-2).

[0180] 62<ν dC<88 (6-1)

[0181] 66 < v dC < 80 (6-2)

[0182] When the minimum refractive index of all positive lenses closer to the object side than the aperture St relative to the d-line is set to Ndfm, it is preferable to satisfy the following conditional expression (7). By setting it to be below the lower limit of conditional expression (7), the absolute value of the radius of curvature of the lens will not become too small, thus suppressing the generation of spherical aberration. Furthermore, the positive lenses arranged in the first lens group G1 with a large lens diameter will not become too thick, thus facilitating the miniaturization of the lens system. By setting it to be above the upper limit of conditional expression (7), low-dispersion materials can be selected, which is beneficial for chromatic aberration correction. To obtain even better characteristics, it is more preferable to satisfy the following conditional expression (7-1).

[0183] 1.46 < Ndfm < 1.72 (7)

[0184] 1.52 < Ndfm < 1.68 (7-1)

[0185] Preferably, the imaging lens includes at least two positive lenses on the image side further than the aperture St. When the average refractive index of all positive lenses on the image side further than the aperture St relative to the d-line is set to Ndpr, the following condition (8) is satisfied. By arranging two or more positive lenses on the image side further than the aperture St, astigmatism and image plane curvature can be well corrected. By setting it to not be below the lower limit of condition (8), the absolute value of the lens radius of curvature will not become too small, thus making it easy to effectively correct astigmatism and image plane curvature. By setting it to not be above the upper limit of condition (8), materials other than highly dispersed materials can be selected, which is beneficial for chromatic aberration correction. To obtain even better characteristics, it is more preferable to satisfy the following condition (8-1), and even more preferable to satisfy the following condition (8-2).

[0186] 1.77 < Ndpr < 2.15 (8)

[0187] 1.81 < Ndpr < 2.1 (8-1)

[0188] 1.87 < Ndpr < 2.05 (8-2)

[0189] Preferably, the first lens group G1 includes at least two positive lenses and at least two negative lenses. In this case, spherical aberration, coma, and on-axis chromatic aberration can be well corrected, and aberration variations accompanying changes in the spacing between the first lens group G1 and the second lens group G2 during focusing can be easily reduced.

[0190] Preferably, three positive lenses are arranged consecutively within the first lens group. In this case, the height of the edge rays on the axis can be gradually reduced by the consecutive arrangement of three positive lenses, thus suppressing the generation of spherical aberration. To further suppress the generation of spherical aberration, it is preferable to arrange four positive lenses consecutively within the first lens group.

[0191] Preferably, the first lens group G1 includes at least two negative lenses. When the average of the d-line dispersion coefficients of two negative lenses selected from the negative lenses included in the first lens group G1 in ascending order of d-line dispersion coefficient is set to v dn 1, the following condition (4) is satisfied. In addition, the dispersion coefficients of the "two negative lenses selected in ascending order of dispersion coefficient" can be the same. Specifically, when there are two or more negative lenses with the minimum dispersion coefficient of all negative lenses in the first lens group, this minimum value is v dn 1. When there is only one negative lens with the minimum dispersion coefficient of all negative lenses in the first lens group, the average of this minimum value and the second smallest dispersion coefficient among all negative lenses in the first lens group is v dn 1. In addition, to avoid redundant explanation, the "d-line dispersion coefficient" is simply referred to as "dispersion coefficient" in the above. By setting it to not be below the lower limit of condition (4), it is beneficial to correct secondary chromatic aberration well. By setting it to not exceed the upper limit of condition (4), it is beneficial to correct primary color differences well. By satisfying condition (4), it is beneficial to correct primary and secondary color differences evenly. To obtain even better characteristics, it is more preferable to satisfy the following condition (4-1).

[0192] 15 < v dn1 < 28 (4)

[0193] 16 < v dn1 < 25 (4-1)

[0194] Preferably, the first lens group G1 includes at least two negative lenses. When the average of the d-line dispersion coefficients of two negative lenses selected from the first lens group G1 in ascending order of d-line dispersion coefficient is set as v dn1, and the average of the partial dispersion ratios between the g-line and F-line of two negative lenses selected from the first lens group G1 in ascending order of d-line dispersion coefficient is set as θgFn1, the following condition (19) is satisfied. Similar to condition (4), in condition (19), the dispersion coefficients of the two negative lenses selected in ascending order of d-line dispersion coefficient can also be the same. Similar to θgFA+0.00162×v dA-0.64159 in conditional (17), θgFn1+0.00162×v dn1-0.64159 in conditional (19) represents the average value of the anomalous dispersion of two negative lenses selected in ascending order of dispersion coefficient among the negative lenses arranged in the first lens group G1. The larger this value, the higher the anomalous dispersion. By setting it to not be below the lower limit of conditional (19), primary chromatic aberration can be easily and well corrected. By setting it to not be above the upper limit of conditional (19), secondary chromatic aberration can be easily and well corrected. By satisfying conditional (19), primary and secondary chromatic aberration can be easily and evenly corrected. To obtain even better characteristics, it is more preferable to satisfy the following conditional (19-1).

[0195] 0.01<θgFn1+0.00162×v dn1-0.64159<0.05 (19)

[0196] 0.016<θgFn1+0.00162×v dn1-0.64159<0.042 (19-1)

[0197] Preferably, the first lens group G1 includes at least three negative lenses. In this case, chromatic aberration is easily and well corrected, and it is also beneficial for correcting image plane curvature.

[0198] When the focal length of the first lens group G1 is set to f1 and the focal length of the imaging lens in the state of focusing on an object at infinity is set to f, it is preferable to satisfy the following conditional expression (10). By setting it to not be below the lower limit of conditional expression (10), the refractive power of the first lens group G1 will not become too strong, thus facilitating good correction of various aberrations, especially spherical aberration. By setting it to not be above the upper limit of conditional expression (10), the refractive power of the first lens group G1 will not become too weak, thus facilitating a shorter overall lens length. To obtain even better characteristics, it is more preferable to satisfy the following conditional expression (10-1), even more preferable to satisfy the following conditional expression (10-2), and even more preferable to satisfy the following conditional expression (10-3).

[0199] 0.5 < f1 / f < 3.5 (10)

[0200] 0.7 < f1 / f < 3.3 (10-1)

[0201] 1.4 < f1 / f < 3.2 (10-2)

[0202] 1.8 < f1 / f < 2.9 (10⁻³)

[0203] The first lens group G1 can be configured as follows: sequentially comprising, from the object-side closest, a first unit Gs1 with negative refractive power and a second unit Gs2 with positive refractive power, separated from the first unit Gs1 by the maximum air gap on the optical axis within the first lens group. The first unit Gs1 comprises at least one lens, and the second unit Gs2 comprises either a single lens or a combined lens. In this configuration, the first unit Gs1 and the second unit Gs2 can form a structure similar to a wide-angle conversion lens, easily expanding the viewing angle while suppressing sagittal coma. Figure 1 In the example, the first unit Gs1 includes lens L1a, and the second unit Gs2 includes lens L1b.

[0204] In the structure of the first lens group G1 having the first unit Gs1 and the second unit Gs2 described above, when the focal length of the imaging lens in the state of focusing on an object at infinity is set to f, and the combined focal length of all lenses in the imaging lens in the state of focusing on an object at infinity that are closer to the image side than the second unit Gs2 is set to fm, it is preferable to satisfy the following conditional expression (16). By setting it to not be below the lower limit of conditional expression (16), it is beneficial to suppress coma aberration generated by the first unit Gs1 and the second unit Gs2. By setting it to not be above the upper limit of conditional expression (16), it is beneficial to suppress aberrations generated by lenses that are closer to the image side than the second unit Gs2, especially coma aberration. To obtain even better characteristics, it is more preferable to satisfy the following conditional expression (16-1).

[0205] 0.7 < f / fm < 0.98 (16)

[0206] 0.75 < f / fm < 0.95 (16-1)

[0207] Preferably, when the first lens group G1 has the aforementioned first unit Gs1 and second unit Gs2, the first unit Gs1 includes a negative lens and the second unit Gs2 includes a positive lens. In this case, the number of lenses in the first unit Gs1 and the second unit Gs2, which have large lens diameters, is reduced, thus facilitating the miniaturization and weight reduction of the imaging lens.

[0208] Preferably, in the entire system, one of the lens components closest to the object and the second lens component from the object side has negative refractive power, and the other lens component has positive refractive power. When focused on an object at infinity, the on-axis beam 2 emitted from the image-side lens of the lens component with negative refractive power is divergent. Furthermore, a lens component represents either a single lens or a combined lens. Figure 1 In the example, the lens component closest to the object side of the entire system, namely lens L1a, has negative refractive power, while the second lens component from the object side, namely lens L1b, has positive refractive power. For example... Figure 1 As shown, the beam diameter of the on-axis beam 2 between lens L1a and lens L1b, emitted from lens L1a towards the image side, increases as it moves towards the image side, becoming a divergent beam.

[0209] As described above, by arranging a lens component with negative refractive power closer to the object, the angle of the principal ray with the maximum viewing angle emitted from this lens component towards the image side relative to the optical axis Z can be reduced, thus easily suppressing sagittal coma. Furthermore, by arranging a lens component with negative refractive power within the first lens group, the excessive positive refractive power of the first lens group G1 can be prevented, suppressing spherical aberration and image plane curvature. However, if negative refractive power is continuously arranged so that both the lens component closest to the object side and the second lens component from the object side have negative refractive power, the entire lens system becomes large. Therefore, it is preferable that one of the two lens components has negative refractive power and the other has positive refractive power. Furthermore, by making the on-axis beam 2 emitted from the lens component with negative refractive power diverge, a structure that temporarily expands the beam and then refocuses it can be adopted in the first lens group G1 with positive refractive power, which is beneficial for suppressing sagittal coma.

[0210] Preferably, at least one of the lens closest to the object and the second lens from the object side in the entire system is a negative lens with a concave lens surface on the object side. In this way, by placing the negative lens closer to the object, the angle of the principal ray of maximum viewing angle emitted from the negative lens to the image side relative to the optical axis Z can be reduced, thus easily suppressing sagittal coma. Furthermore, by making the object-side lens surface of the aforementioned negative lens concave, it is beneficial to correct spherical aberration.

[0211] Preferably, the lens surface on the object side of the lens closest to the object in the entire system is concave. In this case, it is beneficial to correct spherical aberration.

[0212] Preferably, the lens closest to the object in the entire system is a negative lens. In this case, the angle of the principal ray with the maximum viewing angle emitted from the lens closest to the object towards the image side relative to the optical axis Z can be reduced, thus making it easier to suppress sagittal coma.

[0213] The imaging lens can be configured such that, sequentially from the object-side closest to the system, it includes a single lens with negative refractive power, a single lens with positive refractive power, and a single lens with positive refractive power. By making the lens closest to the object a negative lens, as described above, sagittal coma is easily suppressed. Furthermore, by continuously arranging positive lenses with the lens closest to the object, the height of the axial fringe rays can be gradually reduced, thus suppressing spherical aberration. Moreover, by using only one negative lens among the three lenses from the first to the third closest to the object, the large size of the lens system can be prevented.

[0214] The second lens group G2 can be configured as a lens group with positive refractive power. In this case, from the moment the light from the object enters the first lens group G1 with positive refractive power until it exits from the second lens group G2, the height of the axial edge rays can be gradually reduced, thus suppressing the generation of spherical aberration even when the F-number is small.

[0215] When the focal length of the first lens group G1 is set to f1 and the focal length of the second lens group G2 is set to f2, it is preferable to satisfy the following conditional expression (13). By setting it to not be below the lower limit of conditional expression (13), the refractive power of the first lens group G1 can be prevented from becoming too strong. By setting it to not be above the upper limit of conditional expression (13), the refractive power of the second lens group G2 can be prevented from becoming too strong. By satisfying conditional expression (13), the aberrations generated by the first lens group G1 and the second lens group G2 can be easily suppressed. In order to obtain better characteristics, it is more preferable to satisfy the following conditional expression (13-1), even more preferable to satisfy the following conditional expression (13-2), and even more preferable to satisfy the following conditional expression (13-3).

[0216] 1 < f1 / f2 < 5 (13)

[0217] 1.2 < f1 / f2 < 4.4 (13-1)

[0218] 2.3 < f1 < f2 < 4.2 (13-2)

[0219] 2.5 < f1 / f2 < 4 (13-3)

[0220] Preferably, the second lens group G2 includes at least two positive lenses and at least two negative lenses. In this case, various aberrations, especially image plane curvature, can be well corrected, and aberration variations accompanying changes in the spacing between the first lens group G1 and the second lens group G2 during focusing can be easily reduced.

[0221] Preferably, the second lens group G2 includes at least two positive lenses and at least three negative lenses. In this case, aberrations can be well corrected, and aberration variations during focusing can be easily suppressed.

[0222] Regarding the movement of each lens group during focusing, it is preferable that, during focusing, the first lens group G1 is fixed relative to the image plane Sim, while the second lens group G2 moves. In a lens system with a large aperture ratio, the diameter of the lens closest to the object tends to increase, thus increasing its weight. Therefore, assuming a structure where the first lens group G1 moves during focusing, several inconveniences occur. First, the heavy lens must be moved during focusing, making high-speed autofocus difficult. Furthermore, moving the heavy lens requires a large motor with high torque, resulting in a larger overall lens assembly. Moreover, the total length of the lens changes with the movement of the lens closest to the object with the largest diameter, causing a shift in the center of gravity of the imaging lens during shooting. For these reasons, an internal focusing or rear focusing method is preferred. Furthermore, a structure where the first lens group G1 does not move during focusing also provides the advantage of easily ensuring the robustness of the lens assembly.

[0223] Preferably, the aperture St is positioned between the lens groups, or the aperture St is positioned within a lens group that is fixed relative to the image plane Sim during focusing. That is, preferably, the aperture St is not included in the focusing lens group. By excluding the aperture unit from the focusing lens group, the focusing lens group can be made lighter, and high-speed autofocus can be achieved. Furthermore, if the focusing lens group can be made lighter, a large, high-torque motor is unnecessary, thus facilitating the miniaturization and lightening of the entire lens system.

[0224] Considering the above, preferably, with emphasis on miniaturization and lightweight design, the aperture St is configured such that the aperture group G1 and the second lens group G2 are positioned between them. During focusing, the first lens group G1 and the aperture St are fixed relative to the image plane Sim, while the second lens group G2 moves.

[0225] Preferably, there is only one lens group that moves during focusing. By using only one lens group that moves during focusing, the structure can be simplified, and the lens device can be miniaturized and made lighter. In lens systems with large aperture ratios, the depth of focus is extremely shallow, and the performance changes associated with lens tilting and / or axial offset can easily become large. In particular, in focusing lens groups that are movable lens groups, it is structurally impossible to make lens tilting and axial offset completely zero; therefore, it is preferable to have a smaller number of movable lens groups.

[0226] As described above, preferably, during focusing, the first lens group G1 is fixed relative to the image plane Sim, and preferably, only one lens group moves during focusing. Considering this, preferably, only the second lens group G2 moves during focusing.

[0227] Preferably, when the second lens group G2 moves during focusing, the number of lenses included in the second lens group G2 is 7 or less. By reducing the number of lenses in the second lens group G2, which serves as the focusing lens group, the focusing lens group can be made lighter, thus facilitating high-speed autofocus. Furthermore, if the focusing lens group can be made lighter, a large, high-torque motor is unnecessary, thus facilitating the miniaturization and lightening of the entire lens system. Considering this, in the structure where the second lens group G2 moves during focusing, it is more preferable that the number of lenses included in the second lens group G2 is 6 or less, and even more preferably 5 or less.

[0228] Preferably, in the structure where the second lens group G2 moves during focusing, the second lens group G2 includes at least one positive lens, and the following condition (9) is satisfied when the average refractive index of all positive lenses in the second lens group relative to the d-line is set to Nd2p. By setting it to not be below the lower limit of condition (9), astigmatism and image plane curvature can be easily and well corrected. By setting it to not be above the upper limit of condition (9), the specific gravity of the lens material will not become too large, thus suppressing the weight increase of the focusing lens group. Furthermore, materials other than highly dispersed materials can be selected, thus suppressing the variation of chromatic aberration when the focusing lens moves. To obtain better characteristics, it is more preferable to satisfy the following condition (9-1), even more preferable to satisfy the following condition (9-2), and even more preferable to satisfy the following condition (9-3).

[0229] 1.7 < Nd2p < 2.2 (9)

[0230] 1.77 < Nd2p < 2.15 (9-1)

[0231] 1.81 < Nd2p < 2.1 (9-2)

[0232] 1.87 < Nd2p < 2.05 (9-3)

[0233] Preferably, when the second lens group G2 moves during focusing, the second lens group G2 includes at least two joint lenses. In this case, variations in chromatic aberration during focusing can be minimized.

[0234] Preferably, in the structure where the second lens group G2 moves during focusing, when the focal length of the second lens group G2 is set to f2 and the focal length of the imaging lens in the state of focusing on an object at infinity is set to f, the following condition (12) is satisfied. By setting it to not be below the lower limit of condition (12), the refractive power of the second lens group G2 will not become too strong, thus easily suppressing the generation of various aberrations generated by the second lens group G2. By setting it to not be above the upper limit of condition (12), the amount of movement of the second lens group G2 during focusing can be reduced, thus facilitating the miniaturization of the lens system. To obtain better characteristics, it is more preferable to satisfy the following condition (12-1), even more preferable to satisfy the following condition (12-2), and even more preferable to satisfy the following condition (12-3).

[0235] 0.3 < |f2| / f < 2.2 (12)

[0236] 0.4 < |f²| / f < 1.9 (12-1)

[0237] 0.45 < |f²| / f < 1.2 (12-2)

[0238] 0.5 < |f²| / f < 1 (12-3)

[0239] Preferably, in the structure where the second lens group G2 moves during focusing, the following condition (14) is satisfied when the lateral magnification of the second lens group G2 is set to β2 when focusing on an object at infinity, the combined lateral magnification of all lenses positioned on the image side of the second lens group G2 when focusing on an object at infinity with lenses positioned on the image side of the second lens group G2 are set to βr, and βr is not set to 1 when lenses are positioned on the image side of the second lens group G2. The condition (14) is |(1-β2) 2 )×βr 2 | represents the amount of movement of the image plane position relative to the second lens group G2 during focusing, and is referred to as the focusing sensitivity. By setting it to not be below the lower limit of condition (14), the amount of movement of the second lens group G2 during focusing can be reduced, thus facilitating the miniaturization of the lens system. By setting it to not be above the upper limit of condition (14), the stopping accuracy of the focusing lens group during focusing can be tightened. Furthermore, by setting it to not be above the upper limit of condition (14), it is not necessary to increase the refractive power of the second lens group G2 for the sake of focusing sensitivity. Therefore, spherical aberration and coma can be easily corrected. To obtain better characteristics, it is more preferable to satisfy the following condition (14-1), and even more preferable to satisfy the following condition (14-2).

[0240] 0.3 < |(1-β2) 2 )×βr 2|<1.5 (14)

[0241] 0.4 < |(1-β2) 2 )×βr 2 |<1.4 (14-1)

[0242] 0.6 < |(1-β2) 2 )×βr 2 |<1 (14-2)

[0243] like Figure 1 As illustrated in the examples, preferably, the imaging lens of the present invention, from the object side to the image side, comprises only three lens groups: a first lens group G1 fixed relative to the image plane Sim during focusing, a second lens group G2 movable during focusing, and a third lens group G3 comprising two or fewer lenses and fixed relative to the image plane Sim during focusing. Alternatively, as illustrated in the embodiments described later, preferably, the imaging lens of the present invention, from the object side to the image side, comprises only two lens groups: a first lens group G1 fixed relative to the image plane Sim during focusing and a second lens group G2 movable during focusing. The effect of the structure where the first lens group G1 is fixed relative to the image plane Sim during focusing and the second lens group G2 is movable is as described above. When no lens is arranged further on the image side than the second lens group G2, it is easy to ensure the travel of the second lens group G2, which is the focusing lens group, while suppressing the increase in the total length of the lens. Alternatively, even when a lens is positioned further on the image side than the second lens group G2, by setting the number of lenses to two or fewer, it is easy to ensure the travel of the second lens group G2, which serves as the focusing lens group, while suppressing an increase in the overall lens length. This makes it easier to increase the maximum magnification. If, assuming that multiple lenses are positioned further on the image side than the second lens group G2 while maintaining the overall lens length, the travel of the second lens group G2 will decrease, potentially reducing the maximum magnification. Alternatively, if the refractive power of the second lens group G2 is enhanced to achieve the same maximum magnification while maintaining the overall lens length, the aberrations generated by the second lens group G2 will increase, especially spherical aberration and image plane curvature.

[0244] Preferably, the imaging lens comprises 13 or fewer lenses, more preferably 12 or fewer. By using a small number of lenses to form the imaging lens, miniaturization and weight reduction can be achieved.

[0245] Preferably, the number of lenses positioned on the object side closer to the aperture St is 8 or less, more preferably 7 or less. Lenses positioned on the object side closer to the aperture St tend to have larger outer diameters and are heavier, therefore it is preferable to minimize the number of lenses positioned on the object side closer to the aperture St.

[0246] Preferably, when the distance on the optical axis from the lens surface closest to the object to the aperture St in the state of focusing on an object at infinity is set to Tf, and the sum of the distance on the optical axis from the lens surface closest to the object to the lens surface closest to the image in the state of focusing on an object to the back focal length measured in air-converted distance is set to TL, the following conditional expression (15) is satisfied. The first lens group G1 arranged on the object side has positive refractive power, so by setting it to not be below the lower limit of conditional expression (15), the height of the light rays arranged in the lens arranged on the image side of the aperture St can be further reduced, thereby helping to suppress the generation of various aberrations in the lens arranged on the image side of the aperture St. Furthermore, by setting it to not be below the lower limit of conditional expression (15), it is easy to arrange the number of lenses required for the correction of spherical aberration and on-axis chromatic aberration, etc., on the object side of the aperture St. By setting the condition to not exceed the upper limit of condition (15), it is possible to suppress the large diameter of the lens positioned closer to the object side than the aperture St, thus making it easier to miniaturize and lighten the entire lens system. To obtain better characteristics, it is more preferable to satisfy the following condition (15-1), and even more preferable to satisfy the following condition (15-2).

[0247] 0.2 < Tf / TL < 0.65 (15)

[0248] 0.4 < Tf / TL < 0.64 (15-1)

[0249] 0.48 < Tf / TL < 0.61 (15-2)

[0250] Preferably, when the sum of the distance along the optical axis from the lens surface closest to the object to the lens surface closest to the image, when focusing on an object at infinity, and the back focal length (measured in air distance) is set to TL, the F-number of the imaging lens when focusing on an object at infinity is set to FNo, and the focal length of the imaging lens when focusing on an object at infinity is set to f, the following conditional expression (5) is satisfied. By setting it to not be below the lower limit of conditional expression (5), it is beneficial to correct various aberrations well. More specifically, it is easy to configure the optimal number of lenses for correcting various aberrations, thus benefiting to obtain higher imaging performance. By setting it to not be above the upper limit of conditional expression (5), it is beneficial to suppress the enlargement of the lens system. To obtain better characteristics, it is more preferable to satisfy the following conditional expression (5-1), and even more preferable to satisfy the following conditional expression (5-2).

[0251] 1.5 < TL × FNo / f < 5 (5)

[0252] 1.8 < TL × FNo / f < 3.5 (5-1)

[0253] 2 < TL × FNo / f < 3.2 (5-2)

[0254] Preferably, when the maximum half-angle of the imaging lens when focusing on an object at infinity is set to ωmax and the F-value of the imaging lens when focusing on an object at infinity is set to FNo, the following condition (11) is satisfied. If condition (11) is considered under the premise of maintaining a small F-value, the smaller the value of 1 / {tan(ωmax)×FNo} in condition (11), the wider the lens system will become an optical system with a wider angle, and the larger the value, the longer the lens system will become an optical system with a longer focal length. When maintaining a small F-value while being below the lower limit of condition (11), it will be difficult to correct sagittal coma, and in order to correct sagittal coma, the number of lenses in the first lens group G1 with a large outer diameter will increase, which may make the lens system larger. On the other hand, when maintaining a small F-value while being above the upper limit of condition (11), the diameter of the incident pupil will increase, and the diameter of the entire lens system will increase, which may make the lens system larger. Alternatively, to correct the on-axis chromatic aberration that arises as the lens system becomes a longer focal length optical system, it may be necessary to increase the overall length of the lens. Therefore, satisfying condition (11) is advantageous in balancing a small F-number and miniaturization of the lens system. For even better characteristics, satisfying condition (11-1) is more preferable, and satisfying condition (11-2) is even more preferable.

[0255] 1.8<1 / {tan(ωmax)×FNo}<4.5 (11)

[0256] 2.4<1 / {tan(ωmax)×FNo}<4.2 (11-1)

[0257] 2.8<1 / {tan(ωmax)×FNo}<3.8 (11-2)

[0258] Next, feasible structural examples of the imaging lens of the present invention will be described. In all of the following structural examples 1 to 15, the second lens group G2 is configured such that only the second lens group G2 moves along the optical axis Z during focusing. In the following descriptions of structural examples, the designations "first," "second," etc., associated with the joining lens are specific to each structural example. Therefore, for example, even with a "first joining lens," the structure of the lenses included in that joining lens may sometimes differ depending on the structural example.

[0259] The imaging lens of the first structural example comprises, from the object side, a first lens group G1, an aperture St, a second lens group G2, and a third lens group G3. The first lens group G1, from the object side, comprises, in sequence, a biconcave lens, a positive lens with its convex surface facing the image side, two positive meniscus lenses with their convex surfaces facing the object side, a first conjoined lens, and a negative meniscus lens with its convex surface facing the object side. The first conjoined lens, from the object side, is formed by joining the positive meniscus lens with its convex surface facing the object side and the negative meniscus lens with its convex surface facing the object side. The second lens group G2, from the object side, comprises, in sequence, a negative meniscus lens with its concave surface facing the object side, a second conjoined lens, and a third conjoined lens. The second conjoined lens, from the object side, is formed by joining a biconvex lens and a biconcave lens. The third conjoined lens, from the object side, is formed by joining a biconvex lens and a negative lens with its concave surface facing the object side. The third lens group G3 comprises only a biconvex lens.

[0260] The imaging lens of the second structural example includes, from the object side, a first lens group G1, an aperture St, and a second lens group G2. The first lens group G1 and the second lens group G2 of the second structural example are the same as the first lens group G1 and the second lens group G2 of the first structural example, respectively.

[0261] The imaging lens of the third structural example includes, from the object side, a first lens group G1, an aperture St, and a second lens group G2. The first lens group G1, from the object side, includes, in sequence, a biconcave lens, a positive meniscus lens with its convex surface facing the object side, a biconvex lens, another positive meniscus lens with its convex surface facing the object side, a first conjoined lens, and a negative meniscus lens with its convex surface facing the object side. The first conjoined lens, from the object side, is formed by joining a positive meniscus lens with its convex surface facing the object side and a negative meniscus lens with its convex surface facing the object side. The second lens group G2, from the object side, includes, in sequence, a second conjoined lens, a negative meniscus lens with its concave surface facing the object side, and a third conjoined lens. The second conjoined lens, from the object side, is formed by joining a biconcave lens and a biconvex lens. The third conjoined lens, from the object side, is formed by joining a biconvex lens and a biconcave lens.

[0262] The imaging lens of the fourth structural example comprises, from the object side, a first lens group G1, an aperture St, and a second lens group G2. The first lens group G1, from the object side, comprises, in sequence, a biconcave lens, a biconvex lens, three positive lenses with convex surfaces facing the object side, a first conjoined lens, and a negative meniscus lens with its convex surface facing the object side. The first conjoined lens, from the object side, is composed of a biconvex lens and a biconcave lens joined together. The second lens group G2, from the object side, comprises, in sequence, a second conjoined lens, a biconcave lens, and a third conjoined lens. The second conjoined lens, from the object side, is composed of a biconcave lens and a biconvex lens joined together. The third conjoined lens, from the object side, is composed of a biconvex lens and a negative meniscus lens with its concave surface facing the object side joined together.

[0263] The imaging lens in the fifth structural example comprises, from the object side, a first lens group G1, an aperture St, and a second lens group G2. The first lens group G1, from the object side, comprises, in sequence, a biconcave lens, a biconvex lens, three positive meniscus lenses with convex surfaces facing the object side, and two negative meniscus lenses with convex surfaces facing the object side. The second lens group G2, from the object side, comprises, in sequence, a negative meniscus lens with its concave surface facing the object side, a first joining lens, and a second joining lens. The first joining lens, from the object side, is composed of a biconvex lens and a biconcave lens joined together. The third joining lens, from the object side, is composed of a biconvex lens and a negative meniscus lens with its concave surface facing the object side joined together.

[0264] The imaging lens of the sixth structural example includes, from the object side, a first lens group G1, an aperture St, a second lens group G2, and a third lens group G3. The first lens group G1, from the object side, includes three positive meniscus lenses with convex surfaces facing the object side, a first conjoined lens, and a second conjoined lens. The first conjoined lens, from the object side, is formed by joining a negative meniscus lens with convex surfaces facing the object side and a biconvex lens. The second conjoined lens, from the object side, is formed by joining a biconcave lens and a positive meniscus lens with convex surfaces facing the object side. The second lens group G2, from the object side, includes a third conjoined lens and a fourth conjoined lens. The third conjoined lens, from the object side, is formed by joining a biconcave lens and a biconvex lens. The fourth conjoined lens, from the object side, is formed by joining a positive meniscus lens with concave surfaces facing the object side and a biconcave lens. The third lens group G3, from the object side, includes a biconvex lens, a fifth conjoined lens, a biconvex lens, and a biconcave lens. The fifth joining lens is composed of a positive lens with its convex surface facing the image side and a biconcave lens joined together from the object side.

[0265] The imaging lens of the seventh structural example comprises, from the object side, a first lens group G1, an aperture St, a second lens group G2, and a third lens group G3. The first lens group G1, from the object side, comprises, in sequence, a biconcave lens, a biconvex lens, two positive meniscus lenses with convex surfaces facing the object side, a first joining lens, and a second joining lens. The first joining lens, from the object side, is formed by joining a negative meniscus lens with its convex surface facing the object side and a biconvex lens. The second joining lens, from the object side, is formed by joining a biconcave lens and a positive lens with its convex surface facing the object side. The second lens group G2 and the third lens group G3 of the seventh structural example are the same as those of the second lens group G2 and the third lens group G3 of the sixth structural example.

[0266] The imaging lens of the eighth structural example comprises, from the object side, a first lens group G1 and a second lens group G2. The first lens group G1, from the object side, comprises, in sequence, a biconcave lens, a first conjoined lens, a biconvex lens, a second conjoined lens, a biconvex lens, and a positive meniscus lens with its convex surface facing the object side. The first conjoined lens, from the object side, is composed of a biconcave lens and a biconvex lens joined together. The second conjoined lens, from the object side, is composed of a biconvex lens and a negative meniscus lens with its concave surface facing the object side. The second lens group G2, from the object side, comprises, in sequence, a positive meniscus lens with its convex surface facing the object side, a third conjoined lens, an aperture St, a negative meniscus lens with its concave surface facing the object side, and a fourth conjoined lens. The third conjoined lens, from the object side, is composed of a biconvex lens and a biconcave lens joined together. The fourth conjoined lens, from the object side, is composed of a biconvex lens, a biconcave lens, and a biconvex lens joined together.

[0267] The imaging lens of the ninth structural example comprises, from the object side, a first lens group G1 and a second lens group G2. The first lens group G1, from the object side, comprises, in sequence, a positive lens with its convex surface facing the image side, a biconcave lens, a first conjoined lens, a second conjoined lens, a biconvex lens, and a positive meniscus lens with its convex surface facing the object side. The first conjoined lens, from the object side, is formed by joining a biconcave lens and a biconvex lens. The second conjoined lens, from the object side, is formed by joining a biconvex lens and a negative meniscus lens with its concave surface facing the object side. The second lens group G2, from the object side, comprises, in sequence, a positive meniscus lens with its convex surface facing the object side, a third conjoined lens, an aperture St, a fourth conjoined lens, and a biconvex lens. The third conjoined lens, from the object side, is formed by joining a biconvex lens and a biconcave lens. The fourth conjoined lens, from the object side, is formed by joining a negative meniscus lens with its concave surface facing the object side and a positive meniscus lens with its concave surface facing the object side.

[0268] The imaging lens of the 10th structural example comprises, from the object side, a first lens group G1 and a second lens group G2. The first lens group G1 of the 10th structural example is the same as the first lens group G1 of the 9th structural example. The second lens group G2 of the 10th structural example comprises, from the object side, a positive meniscus lens with its convex surface facing the object side, a third converging lens, an aperture St, a negative meniscus lens with its concave surface facing the object side, a positive meniscus lens with its concave surface facing the object side, and a fourth converging lens. The third converging lens is constructed from the object side by combining a biconvex lens and a biconcave lens. The fourth converging lens is constructed from the object side by combining a biconvex lens and a biconcave lens.

[0269] The imaging lens of the 11th structural example comprises, from the object side, a first lens group G1, a second lens group G2, and a third lens group G3. The first lens group G1, from the object side, comprises, in sequence, a positive meniscus lens with its convex surface facing the image side, a biconcave lens, a biconvex lens, a first conjoined lens, and a second conjoined lens. The first conjoined lens, from the object side, is formed by joining a biconcave lens and a biconvex lens. The second conjoined lens, from the object side, is formed by joining a biconvex lens and a negative meniscus lens with its concave surface facing the object side. The second lens group G2, from the object side, comprises, in sequence, a positive meniscus lens with its convex surface facing the object side, a third conjoined lens, an aperture St, a fourth conjoined lens, and a biconvex lens. The third conjoined lens, from the object side, is formed by joining a biconvex lens and a biconcave lens. The fourth conjoined lens, from the object side, is formed by joining a biconcave lens and a biconvex lens. The third lens group G3 includes a combined lens consisting of a positive meniscus lens with its concave surface facing the object side and a negative meniscus lens with its concave surface facing the object side, joined together sequentially from the object side.

[0270] The imaging lens of the 12th structural example comprises, from the object side, a first lens group G1 and a second lens group G2. The first lens group G1, from the object side, comprises, in sequence, a biconcave lens, a first conjoined lens, a biconvex lens, a second conjoined lens, a third conjoined lens, and a biconvex lens. The first conjoined lens, from the object side, is formed by joining a biconcave lens and a biconvex lens. The second conjoined lens, from the object side, is formed by joining a biconcave lens and a positive meniscus lens with its convex surface facing the object side. The third conjoined lens, from the object side, is formed by joining a biconvex lens and a negative meniscus lens with its concave surface facing the object side. The second lens group G2, from the object side, comprises, in sequence, a positive meniscus lens with its convex surface facing the object side, a fourth conjoined lens, an aperture St, a biconcave lens, and a fifth conjoined lens. The fourth conjoined lens, from the object side, is formed by joining a biconvex lens and a biconcave lens. The fifth conjoined lens, from the object side, is formed by joining a biconvex lens, a biconcave lens, and a biconvex lens.

[0271] The imaging lens of the 13th structural example comprises, from the object side, a first lens group G1, an aperture St, a second lens group G2, and a third lens group G3. The first lens group G1, from the object side, comprises, in sequence, a biconcave lens, a first conjoined lens, a biconvex lens, a second conjoined lens, a third conjoined lens, two positive meniscus lenses with their convex surfaces facing the object side, a fourth conjoined lens, and a negative meniscus lens with its convex surface facing the object side. The first conjoined lens, from the object side, is composed of a biconcave lens and a biconvex lens joined together. The second conjoined lens, from the object side, is composed of a positive meniscus lens with its concave surface facing the object side and a biconcave lens joined together. The third conjoined lens, from the object side, is composed of a biconvex lens and a negative meniscus lens with its concave surface facing the object side. The fourth conjoined lens, from the object side, is composed of a biconvex lens and a biconcave lens joined together. The second lens group G2, from the object side, comprises a negative meniscus lens with its concave surface facing the object side and a fifth conjoined lens. The fifth lens group is composed of a biconvex lens, a biconcave lens, and another biconvex lens joined together, starting from the object side. The third lens group G3 consists only of a plano-concave lens with its concave surface facing the object side.

[0272] The imaging lens of the 14th structural example comprises, from the object side, a first lens group G1, an aperture St, and a second lens group G2. The first lens group G1, from the object side, comprises, in sequence, a biconcave lens, a first conjoined lens, a biconvex lens, a biconcave lens, a second conjoined lens, a biconvex lens, a positive meniscus lens with its convex surface facing the object side, a third conjoined lens, and a negative meniscus lens with its convex surface facing the object side. The first conjoined lens, from the object side, is composed of a biconcave lens and a biconvex lens joined together. The second conjoined lens, from the object side, is composed of a biconvex lens and a negative meniscus lens with its concave surface facing the object side. The third conjoined lens, from the object side, is composed of a biconvex lens and a biconcave lens joined together. The second lens group G2, from the object side, comprises, in sequence, a biconcave lens, a fourth conjoined lens, and a biconvex lens. The fourth conjoined lens, from the object side, is composed of a biconvex lens and a biconcave lens joined together.

[0273] The imaging lens of the 15th structural example comprises, from the object side, a first lens group G1, an aperture St, a second lens group G2, and a third lens group G3. The first lens group G1, from the object side, comprises, in sequence, a biconcave lens, a first conjoined lens, a biconvex lens, a second conjoined lens, a third conjoined lens, a biconvex lens, two positive meniscus lenses with their convex surfaces facing the object side, a fourth conjoined lens, and a negative meniscus lens with its convex surface facing the object side. The first conjoined lens, from the object side, is composed of a biconcave lens and a biconvex lens joined together. The second conjoined lens, from the object side, is composed of a positive meniscus lens with its concave surface facing the object side and a biconcave lens joined together. The third conjoined lens, from the object side, is composed of a biconvex lens and a negative meniscus lens with its concave surface facing the object side. The fourth conjoined lens, from the object side, is composed of a biconvex lens and a biconcave lens joined together. The second lens group G2, from the object side, comprises a negative meniscus lens with its concave surface facing the object side and a fifth conjoined lens. The fifth joining lens is composed of a biconvex lens, a negative meniscus lens with its concave surface facing the object side, and a positive meniscus lens with its concave surface facing the object side, joined together sequentially from the object side. The third lens group G3 includes a plano-convex lens with its convex surface facing the object side.

[0274] The above-described preferred and feasible structures can be combined in any way, and are preferably selectively adopted according to the required specifications. According to the technology of the present invention, a suitable imaging lens with a small F-number and well-corrected aberrations can be achieved.

[0275] Next, a numerical embodiment of the imaging lens of the present invention will be described.

[0276] [Example 1]

[0277] The cross-sectional structure of the imaging lens in Example 1 is shown below. Figure 1 The illustrated method and structure are as described above, therefore repeated descriptions are omitted here. The imaging lens of Embodiment 1, from the object side, sequentially includes a first lens group G1 with positive refractive power, an aperture St, a second lens group G2 with positive refractive power, and a third lens group G3 with positive refractive power. When focusing from an object at infinity to the nearest object, the first lens group G1 and the third lens group G3 are fixed relative to the image plane Sim, while the second lens group G2 moves along the optical axis Z towards the object side. The first lens group G1, from the object side, sequentially includes seven lenses L1a to L1g. The second lens group G2, from the object side, sequentially includes five lenses L2a to L2e. The third lens group G3 includes one lens, L3a.

[0278] Regarding the imaging lens of Embodiment 1, basic lens data is shown in Table 1, specifications in Table 2, variable surface spacing in Table 3, and aspherical coefficients in Table 4. In Table 1, the Sn column shows the surface numbering when the surface closest to the object side is designated as surface 1 and the numbering increases sequentially towards the image side; the R column shows the radius of curvature of each surface; and the D column shows the surface spacing along the optical axis between each surface and its image-side adjacent surface. Furthermore, the Nd column shows the refractive index of each component relative to the d-line; the vd column shows the dispersion coefficient of each component based on the d-line; and the θgF column shows the partial dispersion ratio between the g-line and F-line of each component.

[0279] In Table 1, the radius of curvature of the convex surface facing the object side is marked positive, and the radius of curvature of the convex surface facing the image side is marked negative. Table 1 also shows the aperture St and optical components PP, with the surface number and the term (St) listed in the surface number column corresponding to the aperture St. The bottom column of D in Table 1 represents the interval between the image-side surface and the image plane Sim. In Table 1, the variable surface interval that changes during focusing is indicated by the notation DD[], with the object-side surface number of that interval marked in [] and recorded in column D.

[0280] Table 2 shows the focal length f, F-value FNo., and maximum full angle of view 2ωmax of the imaging lens. FNo. is the same as FNo used in the above conditional formula. The unit of 2ωmax is degrees. The values ​​shown in Table 2 are based on the d-line when focusing on an object at infinity.

[0281] In Table 3, the variable surface interval values ​​for focusing on an object at infinity and for focusing on an object at a distance of 0.7 m from the image plane Sim are shown in the columns labeled "infinity" and "0.7 m", respectively.

[0282] In Table 1, the surface numbers of aspherical surfaces are marked with an asterisk (*), and the paraxial radius of curvature is recorded in the radius of curvature column. In Table 4, the surface number of the aspherical surface is shown in the Sn column, and the aspherical coefficients for each aspherical surface are shown in the KA and Am columns (m is an integer greater than 3 and varies depending on the surface). The "E±n" (n: integer) values ​​for the aspherical coefficients in Table 4 represent "×10" ±n KA and Am are the aspheric coefficients in the aspheric formula expressed by the following equation.

[0283] Zd=C×h 2 / {1+(1-KA×C 2 ×h 2 ) 1 / 2}+∑Am×h m

[0284] in,

[0285] Zd: Aspherical depth (the length of the perpendicular line from a point on the aspherical surface at height h to a plane tangent to the vertex of the aspherical surface and perpendicular to the optical axis);

[0286] h: Height (distance from the optical axis to the lens surface);

[0287] C: The reciprocal of the paraxial radius of curvature;

[0288] KA, Am: Aspheric coefficients

[0289] In aspherical form, ∑ represents the summation related to m.

[0290] In the data in each table, degrees are used as the unit for angles and millimeters as the unit for lengths. Optical systems can be used at both magnified and reduced scales, so other appropriate units can also be used. Furthermore, the values ​​are rounded to a specified number of decimal places in the tables shown below.

[0291] [Table 1]

[0292] Example 1

[0293] Sn R D Nd vd θgF 1 -202.46222 2.400 1.61750 36.25 0.58409 2 84.17703 10.655 3 116.82988 10.000 1.45860 90.19 0.53516 4 -99.70316 1.010 5 58.97589 6.168 2.00272 19.32 0.64514 6 157.48112 0.200 7 39.80574 10.250 1.59282 68.62 0.54414 8 93.85195 0.200 9 32.50135 7.910 1.53945 63.48 0.53990 10 113.27635 1.500 1.85896 22.73 0.62844 11 30.08960 2.350 12 48.57213 1.500 1.98613 16.48 0.66558 13 23.70172 7.000 14 (St) ∞ DD

[14] *15 -16.62654 1.800 1.68948 31.02 0.59874 *16 -20.47694 0.200 17 46.52462 7.524 1.95375 32.32 0.59015 18 -24.94567 1.110 1.78555 25.72 0.61045 19 32.92450 1.205 20 53.58123 8.896 1.95375 32.32 0.59015 21 -21.67977 1.210 1.63849 34.39 0.58799 22 121.65386 DD

[22] 23 350.00000 2.000 1.90602 23.33 0.62075 24 -350.00000 12.401 25 ∞ 2.850 1.51680 64.20 0.53430 26 ∞ 1.000

[0294] [Table 2]

[0295] Example 1

[0296] f 51.529 FNo. 1.03 2ωmax 30.6

[0297] [Table 3]

[0298] Example 1

[0299] Infinity 0.7m DD

[14] 11.000 5.227 DD

[22] 1.004 6.777

[0300] [Table 4]

[0301] Example 1

[0302] Sn 15 16 KA 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 A4 1.4134736E-05 1.5709981E-05 A5 2.6259559E-05 2.5965284E-05 A6 -3.3907589E-06 -4.2475360E-06 A7 -2.4053109E-07 -1.2459177E-08 A8 1.0812258E-07 1.0406812E-07 A9 -2.4866912E-09 -8.5930892E-09 A10 -1.7843185E-09 -1.0929846E-09 A11 1.2258615E-10 1.6907154E-10 A12 1.6697433E-11 4.3662373E-12 A13 -1.8317390E-12 -1.5987613E-12 A14 -7.6120774E-14 1.5986683E-14 A15 1.4012767E-14 8.3615812E-15 A16 2.5265457E-17 -2.3879418E-16 A17 -5.5017957E-17 -2.3215598E-17 A18 1.1014057E-18 9.2450531E-19 A19 8.7746514E-20 2.6760815E-20 A20 -2.9531051E-21 -1.2643529E-21

[0303] exist Figure 2 and Figure 3 The diagram shows the aberrations of the imaging lens in Example 1. Figure 2 From left to right, the diagram shows the spherical aberration map, astigmatism map, distortion aberration map, and magnification chromatic aberration map. Figure 2In the diagram, the upper section marked "Infinity" shows aberration diagrams for objects focused at infinity, while the lower section marked "0.7m" shows aberration diagrams for objects focused at a distance of 0.7m from the image plane Sim. In the spherical aberration diagram, aberrations below the d-line, C-line, F-line, and g-line are shown with solid lines, long dashed lines, short dashed lines, and single-dot dashed lines, respectively. In the astigmatism diagram, aberrations below the d-line in the sagittal direction are shown with solid lines, and aberrations below the d-line in the meridional direction are shown with short dashed lines. In the distortion aberration diagram, aberrations below the d-line are shown with solid lines. In the magnification chromatic aberration diagram, aberrations below the C-line, F-line, and g-line are shown with long dashed lines, short dashed lines, and single-dot dashed lines, respectively. FNo. in the spherical aberration diagram represents the F-value, and ω in other aberration diagrams represents the half-angle of view. Figure 2 In the figure, next to the “=" sign, the values ​​of FNo. and ω corresponding to the upper end of the vertical axis of each figure are shown.

[0304] exist Figure 3 The diagram shows the lateral aberrations when focusing on an object at infinity. For each viewpoint, the left column shows the aberrations along the meridional direction, and the right column shows the aberrations along the sagittal direction. Figure 3 ω represents the half-angle of view. In the lateral aberration diagram, the aberrations under the d-line, C-line, F-line, and g-line are shown by solid lines, long dashed lines, short dashed lines, and single-dot dashed lines, respectively.

[0305] Unless otherwise specified, the notation, meaning, recording method and illustration method of the data related to Embodiment 1 above are the same in the following embodiments, so some repeated descriptions are omitted below.

[0306] [Example 2]

[0307] The cross-sectional structure of the imaging lens in Example 2 is shown below. Figure 4 The imaging lens of Embodiment 2, from the object side, comprises a first lens group G1 with positive refractive power, an aperture St, and a second lens group G2 with positive refractive power. When focusing from an object at infinity to the nearest object, the first lens group G1 is fixed relative to the image plane Sim, and the second lens group G2 moves along the optical axis Z towards the object side. The first lens group G1, from the object side, comprises seven lenses L1a to L1g. The second lens group G2, from the object side, comprises five lenses L2a to L2e.

[0308] Regarding the imaging lens of Example 2, the basic lens data is shown in Table 5, the specifications are shown in Table 6, the variable surface spacing is shown in Table 7, the aspherical coefficients are shown in Table 8, and the various aberrations are illustrated in Table 9. Figure 5 and Figure 6 .exist Figure 5 The upper section shows the aberration diagrams for an object focused at infinity, while the lower section shows the aberration diagrams for an object focused at a distance of 0.75 m from the image plane Sim. Figure 6 The image shows a lateral aberration diagram of a state focused on an object at infinity.

[0309] [Table 5]

[0310] Example 2

[0311] Sn R D Nd vd θgF 1 -147.83201 2.400 1.56607 42.61 0.57194 2 86.55844 13.196 3 -1112.59959 10.000 1.49700 81.61 0.53887 4 -74.96995 1.010 5 56.10284 7.350 1.92286 20.88 0.63900 6 168.76278 0.200 7 39.99940 10.364 1.49700 81.61 0.53887 8 153.92109 0.200 9 33.63361 9.003 1.58350 61.79 0.54178 10 143.73093 1.500 1.89286 20.36 0.63944 11 32.94000 2.350 12 58.54173 1.500 1.98613 16.48 0.66558 13 26.84925 7.000 14 (St) ∞ DD

[14] *15 -16.34007 2.374 1.68948 31.02 0.59874 *16 -20.92321 0.200 17 46.16889 5.601 2.00100 29.13 0.59952 18 -34.75772 1.110 1.82933 23.53 0.61772 19 36.00359 1.259 20 65.48463 7.692 2.00100 29.13 0.59952 21 -21.60337 1.210 1.72399 28.80 0.60142 22 -221.70851 DD

[22] 23 ∞ 2.850 1.51680 64.20 0.53430 24 ∞ 1.000

[0312] [Table 6]

[0313] Example 2

[0314] f 48.912 FNo. 1.03 2ωmax 32.2

[0315] [Table 7]

[0316] Example 2

[0317] Infinity 0.75m DD

[14] 11.000 6.974 DD

[22] 15.398 19.418

[0318] [Table 8]

[0319] Example 2

[0320] Sn 15 16 KA 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 A4 1.1642920E-05 1.4474213E-05 A5 2.1306014E-05 2.0258437E-05 A6 -3.3814546E-06 -4.0400080E-05 A7 -1.9812243E-07 4.7913832E-08 A8 1.0663262E-07 9.6017868E-08 A9 1.5803952E-09 -8.4598138E-09 A10 -1.8092896E-09 -9.9449719E-10 A11 9.0694353E-11 1.5710711E-10 A12 1.8185970E-11 4.0001956E-12 A13 -1.4218748E-12 -1.4517868E-12 A14 -9.8519189E-14 1.3061204E-14 A15 1.1294372E-14 7.4850181E-15 A16 1.8703189E-16 -2.0136740E-16 A17 -4.5775183E-17 -2.0557864E-17 A18 5.1939904E-19 7.6973691E-19 A19 7.4994186E-20 2.3482464E-20 A20 -2.1146255E-21 -1.0301864E-21

[0321] [Example 3]

[0322] The cross-sectional structure of the imaging lens in Example 3 is shown below. Figure 7 The imaging lens of Embodiment 3, from the object side, comprises a first lens group G1 with positive refractive power, an aperture St, and a second lens group G2 with positive refractive power. When focusing from an object at infinity to the nearest object, the first lens group G1 is fixed relative to the image plane Sim, and the second lens group G2 moves along the optical axis Z towards the object side. The first lens group G1, from the object side, comprises seven lenses L1a to L1g. The second lens group G2, from the object side, comprises five lenses L2a to L2e.

[0323] Regarding the imaging lens of Example 3, the basic lens data is shown in Table 9, the specifications are shown in Table 10, the variable surface spacing is shown in Table 11, the aspherical coefficients are shown in Table 12, and the various aberrations are illustrated in Table 13. Figure 8 and Figure 9 .exist Figure 8 The upper section shows the aberration diagrams for an object focused at infinity, while the lower section shows the aberration diagrams for an object focused at a distance of 0.7 m from the image plane Sim. Figure 9 The image shows a lateral aberration diagram of a state focused on an object at infinity.

[0324] [Table 9]

[0325] Example 3

[0326] Sn R D Nd vd θgF 1 -138.62827 2.400 1.54072 47.23 0.56780 2 58.55723 10.030 3 75.89616 11.800 1.59282 68.62 0.54414 4 -105.01257 0.200 5 45.45982 10.800 1.59282 68.62 0.54414 6 399.21443 0.600 7 44.95362 4.320 1.95906 17.47 0.65993 8 63.84817 0.600 9 36.12697 5.270 1.78800 47.52 0.55545 10 60.17700 1.800 1.89286 20.36 0.63944 11 31.65635 4.565 12 177.12407 1.520 1.80809 22.76 0.63073 13 27.86122 6.406 14 (St) ∞ DD

[14] *15 -14.64464 2.550 1.68863 31.20 0.60109 *16 -18.73058 0.200 17 49.66071 6.450 1.88300 39.22 0.57295 18 -32.52200 1.210 1.69895 30.05 0.60174 19 32.52200 0.820 20 42.22428 8.800 1.88300 39.22 0.57295 21 -28.75400 1.210 1.62005 36.35 0.58602 22 -178.14293 DD

[22] 23 ∞ 2.850 1.51680 64.20 0.53430 24 ∞ 1.000

[0327] [Table 10]

[0328] Example 3

[0329] f 49.549 FNo. 1.03 2ωmax 31.4

[0330] [Table 11]

[0331] Example 3

[0332] Infinity 0.7m DD

[14] 11.466 7.025 DD

[22] 14.401 18.842

[0333] [Table 12]

[0334] Example 3

[0335] Sn 15 16 KA 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 A4 5.0823068E-05 3.9661172E-05 A5 5.6696216E-06 7.3155985E-06 A6 -1.1665918E-06 -1.9241870E-06 A7 2.3011235E-07 2.0632606E-07 A8 -8.5462646E-09 2.7709406E-08 A9 -3.9871990E-09 -6.9926396E-09 A10 5.8946218E-10 -2.2702122E-11 A11 6.8551648E-12 9.8429055E-11 A12 -7.4371184E-12 -3.5432557E-12 A13 3.9451971E-13 -7.7218349E-13 A14 3.7621265E-14 4.3918443E-14 A15 -4.2785117E-15 3.5209637E-15 A16 -2.5668735E-17 -2.5005394E-16 A17 1.8252095E-17 -8.7077803E-18 A18 -4.3536351E-19 7.1579377E-19 A19 -2.9072588E-20 9.0040531E-21 A20 1.1528202E-21 -8.3059544E-22

[0336] [Example 4]

[0337] The cross-sectional structure of the imaging lens in Example 4 is shown below. Figure 10 The imaging lens of Embodiment 4, from the object side, comprises a first lens group G1 with positive refractive power, an aperture St, and a second lens group G2 with positive refractive power. When focusing from an object at infinity to the nearest object, the first lens group G1 is fixed relative to the image plane Sim, while the second lens group G2 moves along the optical axis Z towards the object side. The first lens group G1, from the object side, comprises seven lenses, L1a to L1g. The second lens group G2, from the object side, comprises five lenses, L2a to L2e.

[0338] Regarding the imaging lens of Example 4, the basic lens data is shown in Table 13, the specifications are shown in Table 14, the variable surface spacing is shown in Table 15, the aspherical coefficients are shown in Table 16, and the various aberrations are illustrated in Table 17. Figure 11 and Figure 12 .exist Figure 11 The upper section shows the aberration diagrams for an object focused at infinity, while the lower section shows the aberration diagrams for an object focused at a distance of 0.6 m from the image plane Sim. Figure 12 The image shows a lateral aberration diagram of a state focused on an object at infinity.

[0339] [Table 13]

[0340] Example 4

[0341] Sn R D Nd vd θgF 1 -184.15927 2.400 1.80000 29.84 0.60178 2 62.61647 4.878 3 98.51388 6.313 1.98613 16.48 0.66558 4 4034.13252 1.100 5 63.34975 10.200 1.59282 68.62 0.54414 6 -296.07052 0.200 7 44.03004 10.250 1.59282 68.62 0.54414 8 795.08982 0.200 9 34.85519 7.910 1.87070 40.73 0.56825 10 121.35104 1.500 1.89286 20.36 0.63944 11 41.54155 2.500 12 103.47070 1.500 1.85896 22.73 0.62844 13 22.43821 7.000 14 (St) ∞ DD

[14] 15 -23.29314 1.110 1.59270 35.31 0.59336 16 23.13973 7.642 1.88300 39.22 0.57295 17 -49.13842 0.500 *18 -31.45625 2.200 1.68948 31.02 0.59874 *19 -35.44240 0.100 20 57.70265 8.669 1.88300 39.22 0.57295 21 -29.44571 1.210 1.59270 35.31 0.59336 22 455.30805 DD

[22] 23 ∞ 2.850 1.51680 64.20 0.53430 24 ∞ 1.000

[0342] [Table 14]

[0343] Example 4

[0344] f 48.495 FNo. 1.03 2ωmax 32.4

[0345] [Table 15]

[0346] Example 4

[0347] Infinity 0.6m DD

[14] 10.100 5.021 DD

[22] 14.402 19.481

[0348] [Table 16]

[0349] Example 4

[0350] Sn 18 19 KA 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 A4 -4.1880254E-05 -1.8080969E-05 A5 2.2277957E-05 1.7658879E-05 A6 -1.0486644E-06 -1.2728716E-06 A7 -6.0774700E-07 -2.8821944E-07 A8 6.5534778E-08 3.8775713E-08 A9 9.8049532E-09 3.2995970E-09 A10 -1.3866580E-09 -5.0968526E-10 A11 -9.2054942E-11 -2.6981943E-11 A12 1.6184890E-11 3.7414083E-12 A13 4.5994752E-13 1.6196819E-13 A14 -1.1024413E-13 -1.4531348E-14 A15 -7.7379704E-16 -6.8886559E-16 A16 4.2085620E-16 1.7953337E-17 A17 -2.3252064E-18 1.8140969E-18 A18 -7.7399797E-19 5.5970230E-20 A19 8.4567070E-21 -2.1514981E-21 A20 4.0991440E-22 -1.5749796E-22

[0351] [Example 5]

[0352] The cross-sectional structure of the imaging lens in Example 5 is shown below. Figure 13 The imaging lens of Embodiment 5, from the object side, comprises a first lens group G1 with positive refractive power, an aperture St, and a second lens group G2 with positive refractive power. When focusing from an object at infinity to the nearest object, the first lens group G1 is fixed relative to the image plane Sim, and the second lens group G2 moves along the optical axis Z towards the object side. The first lens group G1, from the object side, comprises seven lenses L1a to L1g. The second lens group G2, from the object side, comprises five lenses L2a to L2e.

[0353] Regarding the imaging lens of Example 5, the basic lens data is shown in Table 17, the specifications are shown in Table 18, the variable surface spacing is shown in Table 19, the aspherical coefficients are shown in Table 20, and the various aberrations are illustrated in Table 18. Figure 14 and Figure 15 .exist Figure 14 The upper section shows the aberration diagrams for an object focused at infinity, while the lower section shows the aberration diagrams for an object focused at a distance of 0.6 m from the image plane Sim. Figure 15 The image shows a lateral aberration diagram of a state focused on an object at infinity.

[0354] [Table 17]

[0355] Example 5

[0356] Sn R D Nd vd θgF 1 -165.93122 2.400 1.56037 43.68 0.57006 2 76.27518 8.339 3 203.54358 10.000 1.59522 67.73 0.54426 4 -111.87010 1.010 5 56.74170 5.365 1.89286 20.36 0.63944 6 102.45084 0.200 7 44.31471 10.250 1.59522 67.73 0.54426 8 292.61942 0.200 9 32.85510 8.595 1.69253 56.87 0.54266 10 115.66155 1.500 1.78472 25.68 0.61052 11 31.63618 2.819 12 63.52660 1.500 1.89286 20.36 0.63944 13 23.88347 7.000 14 (St) ∞ DD

[14] *15 -16.34570 2.837 1.68948 31.02 0.59874 *16 -22.88973 0.200 17 45.14005 6.141 1.90043 37.37 0.57720 18 -33.79047 1.110 1.70834 29.58 0.59931 19 33.20670 1.120 20 51.98052 8.500 1.90043 37.37 0.57720 21 -22.44701 1.210 1.60763 37.24 0.58209 22 -201.05993 DD

[22] 23 ∞ 2.850 1.54763 54.98 0.55247 24 ∞ 1.000

[0357] [Table 18]

[0358] Example 5

[0359] f 50.617 FNo. 1.03 2ωmax 31.4

[0360] [Table 19]

[0361] Example 5

[0362] Infinity 0.6m DD

[14] 11.000 5.612 DD

[22] 15.436 20.824

[0363] [Table 20]

[0364] Example 5

[0365] Sn 15 16 KA 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 A4 3.1181867E-05 2.6530803E-05 A5 1.4794096E-05 1.5226995E-05 A6 -2.8122797E-06 -3.5186055E-06 A7 8.9003214E-08 2.0389209E-07 A8 6.9213577E-08 7.3115649E-08 A9 -8.7233682E-09 -1.1688257E-08 A10 -8.1799110E-10 -5.0238456E-10 A11 1.9725575E-10 1.9915512E-10 A12 3.0890969E-12 -2.4972651E-12 A13 -2.3953381E-12 -1.7930323E-12 A14 4.0298515E-14 6.6348784E-14 A15 1.6625829E-14 9.1585232E-15 A16 -5.7273231E-16 -4.6481540E-16 A17 -6.1842548E-17 -2.5090883E-17 A18 2.7969524E-18 1.4869080E-18 A19 9.5479576E-20 2.8685321E-20 A20 -4.9925629E-21 -1.8543937E-21

[0366] [Example 6]

[0367] The cross-sectional structure of the imaging lens in Example 6 is shown below. Figure 16 The imaging lens of Embodiment 6, from the object side, sequentially includes a first lens group G1 with positive refractive power, an aperture St, and a second lens group G2 with positive refractive power. When focusing from an object at infinity to the nearest object, the first lens group G1 is fixed relative to the image plane Sim, and the second lens group G2 moves along the optical axis Z towards the object side. The first lens group G1, from the object side, sequentially includes eight lenses L1a to L1h. The second lens group G2, from the object side, sequentially includes five lenses L2a to L2e.

[0368] Regarding the imaging lens of Example 6, the basic lens data is shown in Table 21, the specifications are shown in Table 22, the variable surface spacing is shown in Table 23, the aspherical coefficients are shown in Table 24, and the various aberrations are illustrated in Table 25. Figure 17 and Figure 18 .exist Figure 17 The upper section shows the aberration diagrams for an object focused at infinity, while the lower section shows the aberration diagrams for an object focused at a distance of 0.6 m from the image plane Sim. Figure 18 The image shows a lateral aberration diagram of a state focused on an object at infinity.

[0369] [Table 21]

[0370] Example 6

[0371] Sn R D Nd vd θgF 1 -247.95976 2.800 1.77791 26.10 0.61461 2 75.89689 11.010 3 114.39503 7.000 1.92286 18.90 0.64960 4 -837.42367 0.100 5 69.26549 11.000 1.58525 61.72 0.54210 6 196.03197 0.100 7 84.81564 7.038 1.53775 74.70 0.53936 8 1034.21503 0.100 9 91.91092 5.000 1.53775 74.70 0.53936 10 177.41757 0.100 11 33.30279 12.000 1.88300 39.22 0.57295 12 -424.49645 1.510 1.72186 28.91 0.60113 13 61.07419 1.500 14 98.63832 1.500 1.91717 19.14 0.63501 15 21.08130 7.000 16 (St) ∞ DD

[16] 17 -22.42941 1.100 1.58780 39.22 0.57813 18 23.14403 7.400 1.88300 39.22 0.57295 19 -31.61388 1.000 *20 -33.94641 1.800 1.61724 36.28 0.58403 *21 173.48601 0.100 22 47.71113 7.271 1.81834 46.17 0.55821 23 -26.72012 1.210 1.69584 30.30 0.60324 24 -56.34422 DD

[24] 25 ∞ 2.850 1.51680 64.20 0.53430 26 ∞ 1.000

[0372] [Table 22]

[0373] Example 6

[0374] f 48.498 FNo. 1.03 2ωmax 32.6

[0375] [Table 23]

[0376] Example 6

[0377] Infinity 0.6m DD

[16] 10.100 4.816 DD

[24] 14.400 19.684

[0378] [Table 24]

[0379] Example 6

[0380] Sn 20 21 KA 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 A4 -2.3773046E-05 3.0929722E-06 A5 5.6674484E-06 4.8487684E-06 A6 5.6970844E-08 -5.0456910E-07 A7 -1.9176909E-07 1.5258010E-08 A8 1.9626233E-08 6.7914018E-09 A9 2.9049337E-09 -1.5524880E-09 A10 -6.6057808E-10 -1.1339723E-11 A11 -1.9889473E-11 2.4115890E-11 A12 1.0577029E-11 -4.6114184E-13 A13 7.5098137E-15 -1.8660180E-13 A14 -9.7929627E-14 3.8327989E-15 A15 7.5328476E-16 7.9224149E-16 A16 5.3398130E-16 -7.7601860E-18 A17 -4.2992770E-18 -1.7504256E-18 A18 -1.5949215E-18 -2.1972718E-20 A19 7.7287369E-21 1.5807498E-21 A20 2.0144963E-21 7.7734912E-23

[0381] [Example 7]

[0382] The cross-sectional structure of the imaging lens in Example 7 is shown below. Figure 19 The imaging lens of Embodiment 7, from the object side, sequentially includes a first lens group G1 with positive refractive power, an aperture St, and a second lens group G2 with positive refractive power. When focusing from an object at infinity to the nearest object, the first lens group G1 is fixed relative to the image plane Sim, and the second lens group G2 moves along the optical axis Z towards the object side. The first lens group G1, from the object side, sequentially includes eight lenses L1a to L1h. The second lens group G2, from the object side, sequentially includes five lenses L2a to L2e.

[0383] Regarding the imaging lens of Example 7, the basic lens data is shown in Table 25, the specifications are shown in Table 26, the variable surface spacing is shown in Table 27, the aspherical coefficients are shown in Table 28, and the various aberrations are illustrated in Table 29. Figure 20 and Figure 21 .exist Figure 20 The upper section shows the aberration diagrams for an object focused at infinity, while the lower section shows the aberration diagrams for an object focused at a distance of 0.6 m from the image plane Sim. Figure 21 The image shows a lateral aberration diagram of a state focused on an object at infinity.

[0384] [Table 25]

[0385] Example 7

[0386] Sn R D Nd vd θgF 1 -204.30501 2.800 1.81294 24.35 0.61887 2 81.96794 13.010 3 137.60012 7.000 2.10420 17.02 0.66311 4 -656.31103 3.750 5 69.54614 12.000 1.57265 62.21 0.54137 6 267.60481 0.193 7 88.85695 9.422 1.43875 94.66 0.53402 8 -2937.87944 0.100 9 96.07701 5.000 1.43875 94.66 0.53402 10 181.83582 0.100 11 33.17157 12.000 1.88300 39.22 0.57295 12 -374.98026 1.510 1.76530 26.82 0.60713 13 66.58003 1.500 14 97.44593 1.500 1.96720 17.42 0.64384 15 21.58463 7.000 16 (St) ∞ DD

[16] 17 -22.85203 1.100 1.56026 43.70 0.57003 18 22.46642 7.400 1.88300 39.22 0.57295 19 -31.83440 1.000 *20 -30.58326 1.800 1.66113 32.78 0.59162 *21 340.35421 0.100 22 55.88143 6.486 1.81271 42.14 0.56732 23 -26.29030 1.210 1.70642 29.68 0.60465 24 -49.33676 DD

[24] 25 ∞ 2.850 1.51680 64.20 0.53430 26 ∞ 1.000

[0387] [Table 26]

[0388] Example 7

[0389] f 48.220 FNo. 1.04 2ωmax 32.8

[0390] [Table 27]

[0391] Example 7

[0392] Infinity 0.6m DD

[16] 10.100 4.858 DD

[24] 14.973 20.215

[0393] [Table 28]

[0394] Example 7

[0395] Sn 20 21 KA 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 A4 -2.1813953E-05 5.6632078E-06 A5 5.5899615E-06 4.4402595E-06 A6 8.3363623E-08 -4.7071845E-07 A7 -1.9184059E-07 1.5982530E-08 A8 1.9586298E-08 6.7572477E-09 A9 2.8981856E-09 -1.5590421E-09 A10 -6.6105638E-10 -1.1726148E-11 A11 -1.9888631E-11 2.4116692E-11 A12 1.0581175E-11 -4.5950671E-13 A13 8.0018964E-15 -1.8648724E-13 A14 -9.7926487E-14 3.8358049E-15 A15 7.5055780E-16 7.9215688E-16 A16 5.3398130E-16 -7.7662214E-18 A17 -4.2992770E-18 -1.7496474E-18 A18 -1.5949215E-18 -2.1852378E-20 A19 7.7287369E-21 1.5557319E-21 A20 2.0144963E-21 7.8155637E-23

[0396] [Example 8]

[0397] The cross-sectional structure of the imaging lens in Example 8 is shown below. Figure 22The imaging lens of Embodiment 8, from the object side, comprises a first lens group G1 with positive refractive power, an aperture St, and a second lens group G2 with positive refractive power. When focusing from an object at infinity to the nearest object, the first lens group G1 is fixed relative to the image plane Sim, and the second lens group G2 moves along the optical axis Z towards the object side. The first lens group G1, from the object side, comprises seven lenses L1a to L1g. The second lens group G2, from the object side, comprises five lenses L2a to L2e.

[0398] Regarding the imaging lens of Example 8, basic lens data is shown in Table 29, specifications are shown in Table 30, variable surface spacing is shown in Table 31, aspherical coefficients are shown in Table 32, and various aberrations are illustrated in Table 31. Figure 23 and Figure 24 .exist Figure 23 The upper section shows the aberration diagrams for an object focused at infinity, while the lower section shows the aberration diagrams for an object focused at a distance of 0.6 m from the image plane Sim. Figure 24 The image shows a lateral aberration diagram of a state focused on an object at infinity.

[0399] [Table 29]

[0400] Example 8

[0401] Sn R D Nd vd θgF 1 -1250.00000 2.400 1.50911 53.29 0.55329 2 58.56667 12.004 3 63.53662 10.300 1.55032 75.50 0.54001 4 -324.18577 1.010 5 91.24308 4.145 1.55032 75.50 0.54001 6 237.79601 0.200 7 41.36102 10.250 1.59282 68.62 0.54414 8 108.29456 0.200 9 35.06677 7.900 2.00069 25.46 0.61364 10 76.31696 0.806 11 90.22442 1.500 1.78880 28.43 0.60092 12 28.87926 2.968 13 53.65263 1.500 1.89286 20.36 0.63944 14 23.13445 7.000 15 (St) ∞ DD

[15] *16 -16.70584 1.943 1.68948 31.02 0.59874 *17 -24.50468 0.200 18 44.48608 6.995 1.88300 39.22 0.57295 19 -26.79392 1.110 1.71036 29.48 0.59958 20 33.02652 1.005 21 48.60027 9.237 1.85150 40.78 0.56958 22 -19.88726 1.210 1. 56738 42.37 0.57237 23 -131.23867 DD

[23] 24 ∞ 2.850 1.51680 64.20 0.53430 25 ∞ 1.000

[0402] [Table 30]

[0403] Example 8

[0404] f 51.521 FNo. 1.03 2ωmax 31.0

[0405] [Table 31]

[0406] Example 8

[0407] Infinity 0.6m DD

[15] 11.000 5.534 DD

[23] 15.401 20.867

[0408] [Table 32]

[0409] Example 8

[0410] Sn 16 17 KA 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 A4 7.0570380E-05 6.6014243E-05 A5 1.9198543E-05 1.9606733E-05 A6 -3.3289534E-06 -4.2582967E-06 A7 -9.0333134E-08 1.4153915E-07 A8 9.0099971E-08 9.0936965E-08 A9 -4.1396511E-09 -1.1106603E-08 A10 -1.4390577E-09 -8.1411034E-10 A11 1.2641084E-10 1.9638299E-10 A12 1.3445189E-11 1.0722851E-12 A13 -1.7282916E-12 -1.7929595E-12 A14 -6.2059351E-14 3.9257132E-14 A15 1.2881202E-14 9.2275563E-15 A16 2.3758855E-17 -3.3269509E-16 A17 -5.0325955E-17 -2.5409216E-17 A18 9.0421501E-19 1.1130994E-18 A19 8.0548323E-20 2.9170042E-20 A20 -2.4717980E-21 -1.3898997E-21

[0411] [Example 9]

[0412] The cross-sectional structure of the imaging lens in Example 9 is shown below. Figure 25The imaging lens of Embodiment 9, from the object side, comprises a first lens group G1 with positive refractive power, an aperture St, and a second lens group G2 with positive refractive power. When focusing from an object at infinity to the nearest object, the first lens group G1 is fixed relative to the image plane Sim, and the second lens group G2 moves along the optical axis Z towards the object side. The first lens group G1, from the object side, comprises seven lenses, L1a to L1g. The second lens group G2, from the object side, comprises five lenses, L2a to L2e.

[0413] Regarding the imaging lens of Example 9, the basic lens data is shown in Table 33, the specifications are shown in Table 34, the variable surface spacing is shown in Table 35, the aspherical coefficients are shown in Table 36, and the various aberrations are illustrated in Table 37. Figure 26 and Figure 27 .exist Figure 26 The upper section shows the aberration diagrams for an object focused at infinity, while the lower section shows the aberration diagrams for an object focused at a distance of 0.6 m from the image plane Sim. Figure 27 The image shows a lateral aberration diagram of a state focused on an object at infinity.

[0414] [Table 33]

[0415] Example 9

[0416] Sn R D Nd vd θgF 1 -193.76114 2.400 1.54760 46.08 0.56589 2 75.97796 9.081 3 189.01581 10.000 1.49700 81.61 0.53887 4 -105.13621 1.010 5 56.49917 5.721 1.92119 23.96 0.62025 6 104.36406 0.200 7 43.70727 10.385 1.49700 81.61 0.53887 8 340.80096 0.200 9 32.58246 9.094 1.75819 43.78 0.56631 10 73.72282 1.500 1.78472 25.68 0.61052 11 32.68245 2.542 12 61.75401 1.500 1.89286 20.36 0.63944 13 22.41400 7.000 14 (St) ∞ DD

[14] *15 -16.41866 2.693 1.68948 31.02 0.59874 *16 -22.85517 0.200 17 45.64284 6.105 1.88300 39.22 0.57295 18 -33.87303 1.110 1.68877 30.80 0.59625 19 33.14697 1.132 20 52.16226 8.770 1.88300 39.22 0.57295 21 -21.44050 1.210 1.59203 38.80 0.57897 22 -202.15701 DD

[22] 23 ∞ 2.850 1.51680 64.20 0.53430 24 ∞ 1.000

[0417] [Table 34]

[0418] Example 9

[0419] f 51.018 FNo. 1.03 2ωmax 31.2

[0420] [Table 35]

[0421] Example 9

[0422] Infinity 0.6m DD

[14] 11.000 5.539 DD

[22] 15.401 20.862

[0423] [Table 36]

[0424] Example 9

[0425] Sn 15 16 KA 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 A4 2.5050662E-05 2.1927553E-05 A5 1.6399123E-05 1.6962214E-05 A6 -2.7037336E-06 -3.5614573E-06 A7 2.2716407E-08 1.6637583E-07 A8 7.0481328E-08 7.6462842E-08 A9 -7.0934969E-09 -1.1129036E-08 A10 -9.1743883E-10 -5.7804163E-10 A11 1.7293397E-10 1.9360903E-10 A12 5.1834973E-12 -1.4806257E-12 A13 -2.1727289E-12 -1.7572338E-12 A14 1.7187231E-14 5.7682678E-14 A15 1.5404695E-14 9.0145899E-15 A16 -4.2947569E-16 -4.1936383E-16 A17 -5.8157492E-17 -2.4764768E-17 A18 2.3258567E-18 1.3542989E-18 A19 9.0773374E-20 2.8368189E-20 A20 -4.3526649E-21 -1.6904315E-21

[0426] [Example 10]

[0427] The cross-sectional structure of the imaging lens of Example 10 is shown below. Figure 28The imaging lens of Example 10, from the object side, comprises a first lens group G1 with positive refractive power, an aperture St, a second lens group G2 with negative refractive power, and a third lens group G3 with positive refractive power. When focusing from an object at infinity to the nearest object, the first lens group G1 and the third lens group G3 are fixed relative to the image plane Sim, while the second lens group G2 moves along the optical axis Z towards the image side. The first lens group G1, from the object side, comprises seven lenses L1a to L1g. The second lens group G2, from the object side, comprises four lenses L2a to L2d. The third lens group G3, from the object side, comprises five lenses L3a to L3e.

[0428] Regarding the imaging lens of Example 10, basic lens data are shown in Table 37, specifications are shown in Table 38, variable surface spacing is shown in Table 39, and various aberrations are illustrated in Table 30. Figure 29 and Figure 30 .exist Figure 29 The upper section shows the aberration diagrams for an object focused at infinity, while the lower section shows the aberration diagrams for an object focused at a distance of 0.7 m from the image plane Sim. Figure 30 The image shows a lateral aberration diagram of a state focused on an object at infinity.

[0429] [Table 37]

[0430] Example 10

[0431] Sn R D Nd vd θgF 1 272.44778 3.300 2.05090 26.94 0.60519 2 1081.40696 0.100 3 89.65014 3.000 1.59282 68.62 0.54414 4 152.15669 0.100 5 74.09242 6.000 1.59282 68.62 0.54414 6 263.34977 0.100 7 107.02621 1.500 1.85896 22.73 0.62844 8 78.42749 10.010 1.76212 31.60 0.59550 9 -175.82899 1.000 10 -144.21433 1.500 1.85896 22.73 0.62844 11 80.87758 4.510 1.56883 56.36 0.54890 12 716.45491 5.217 13 (St) ∞ DD

[13] 14 -38.44224 1.000 1.87904 40.10 0.56811 15 130.29249 6.010 1.59410 60.47 0.55516 16 -33.25476 0.600 17 -351.00941 4.000 2.00272 19.32 0.64514 18 -45.80501 1.500 1.64173 39.35 0.57903 19 36.04598 DD

[19] 20 43.30755 7.389 1.59522 67.73 0.54426 21 -236.34955 0.100 22 90.49741 7.652 1.83481 42.72 0.56486 23 -46.09199 1.360 1.67270 32.10 0.59891 24 27.92315 4.075 25 30.74850 9.035 1.65463 48.36 0.56208 26 -201.70415 2.100 27 -51.13607 1.350 1.48749 70.44 0.53062 28 76.12890 21.401 29 ∞ 2.850 1.51680 64.20 0.53430 30 ∞ 1.000

[0432] [Table 38]

[0433] Example 10

[0434] f 87.302 FNo. 1.86 2ωmax 18.6

[0435] [Table 39]

[0436] Example 10

[0437] Infinity 0.7m DD

[13] 5.000 16.962 DD

[19] 15.702 3.740

[0438] [Example 11]

[0439] The cross-sectional structure of the imaging lens in Example 11 is shown below. Figure 31The imaging lens of Example 11, from the object side, sequentially includes a first lens group G1 with positive refractive power, an aperture St, a second lens group G2 with negative refractive power, and a third lens group G3 with positive refractive power. When focusing from an object at infinity to the nearest object, the first lens group G1 and the third lens group G3 are fixed relative to the image plane Sim, while the second lens group G2 moves along the optical axis Z towards the image side. The first lens group G1, from the object side, sequentially includes eight lenses L1a to L1h. The second lens group G2, from the object side, sequentially includes four lenses L2a to L2d. The third lens group G3, from the object side, sequentially includes five lenses L3a to L3e.

[0440] Regarding the imaging lens of Example 11, basic lens data are shown in Table 40, specifications are shown in Table 41, variable surface spacing is shown in Table 42, and various aberrations are illustrated in Table 43. Figure 32 and Figure 33 .exist Figure 32 The upper section shows the aberration diagrams for an object focused at infinity, while the lower section shows the aberration diagrams for an object focused at a distance of 0.8 m from the image plane Sim. Figure 33 The image shows a lateral aberration diagram of a state focused on an object at infinity.

[0441] [Table 40]

[0442] Example 11

[0443] Sn R D Nd vd θgF 1 -386.94657 1.800 1.69680 55.53 0.54341 2 119.46581 2.500 3 207.26394 4.000 1.95375 32.32 0.59015 4 -238.96341 0.100 5 76.64894 4.500 1.59522 67.73 0.54426 6 248.42469 0.100 7 63.92071 5.500 1.43875 94.66 0.53402 8 216.59149 0.100 9 107.16236 1.500 1.85025 30.05 0.59797 10 85.24799 7.998 1.65412 39.68 0.57378 11 -205.11243 1.000 12 -197.70982 1.500 1.92119 23.96 0.62025 13 90.62875 4.510 1.45860 90.19 0.53516 14 -30275.61759 8.130 15 (St) ∞ DD

[15] 16 -43.49420 1.000 1.89190 37.13 0.57813 17 185.12129 6.010 1.77250 49.60 0.55212 18 -44.59399 0.600 19 -428.71303 4.000 2.10420 17.02 0.66311 20 -76.05920 1.500 1.58144 40.75 0.57757 21 37.00980 DD

[21] 22 36.00466 5.851 1..59522 67.73 0.54426 23 -124.44012 0.100 24 829.97224 5.140 1.90043 37.37 0.57720 25 -51.93826 1.360 1.67270 32.10 0.59891 26 28.10820 3.300 27 34.48127 9.174 1.77250 49.60 0.55212 28 -110.39811 2.231 29 -38.11168 1.350 1.48749 70.44 0.53062 30 89.57871 21.429 31 ∞ 2.850 1.51680 64.20 0.53430 32 ∞ 1.000

[0444] [Table 41]

[0445] Example 11

[0446] f 79.213 FNo. 1.65 2ωmax 20.2

[0447] [Table 42]

[0448] Example 11

[0449] Infinity 0.8m DD

[15] 5.043 18.069 DD

[21] 14.864 1.838

[0450] [Example 12]

[0451] The cross-sectional structure of the imaging lens in Example 12 is shown below. Figure 34The imaging lens of Example 12, from the object side, sequentially includes a first lens group G1 with positive refractive power, an aperture St, a second lens group G2 with negative refractive power, and a third lens group G3 with positive refractive power. When focusing from an object at infinity to the nearest object, the first lens group G1 and the third lens group G3 are fixed relative to the image plane Sim, while the second lens group G2 moves along the optical axis Z towards the image side. The first lens group G1, from the object side, sequentially includes eight lenses L1a to L1h. The second lens group G2, from the object side, sequentially includes four lenses L2a to L2d. The third lens group G3, from the object side, sequentially includes five lenses L3a to L3e.

[0452] Regarding the imaging lens of Example 12, basic lens data are shown in Table 43, specifications are shown in Table 44, variable surface spacing is shown in Table 45, and various aberrations are illustrated in Table 46. Figure 35 and Figure 36 .exist Figure 35 The upper section shows the aberration diagrams for an object focused at infinity, while the lower section shows the aberration diagrams for an object focused at a distance of 0.7 m from the image plane Sim. Figure 36 The image shows a lateral aberration diagram of a state focused on an object at infinity.

[0453] [Table 43]

[0454] Example 12

[0455] Sn R D Nd vd θgF 1 -291.68052 1.800 1.64769 33.79 0.59393 2 99.99894 2.500 3 177.53930 4.000 1.92119 23.96 0.62025 4 -250.63993 0.100 5 83.49241 3.500 1.59522 67.73 0.54426 6 315.24688 0.100 7 65.26695 5.500 1.55032 75.50 0.54001 8 230.27246 0.100 9 117.55484 1.500 2.00069 25.46 0.61364 10 89.18435 10.010 1.67300 38.26 0.57580 11 -205.86865 1.000 12 -214.55358 1.500 1.85896 22.73 0.62844 13 81.16463 4.510 1.62299 58.16 0.54589 14 301.17897 7.667 15 (St) ∞ DD

[15] 16 -44.85924 1.000 1.89190 37.13 0.57813 17 78.25190 6.010 1.72916 54.68 0.54451 18 -44.95132 0.600 19 -344.73789 4.000 1.94595 17.98 0.65460 20 -48.43416 1.500 1.58144 40.75 0.57757 21 36.97488 DD

[21] 22 38.40711 5.751 1.59522 67.73 0.54426 23 -82.40638 0.100 24 -707.34003 5.905 1.85150 40.78 0.56958 25 -45.35298 1.360 1.67270 32.10 0.59891 26 27.74475 1.726 27 31.49767 9.688 1.80400 46.53 0.55775 28 -172.72812 2.100 29 -40.02478 1.350 1.48749 70.44 0.53062 30 129.32128 21.402 31 ∞ 2.850 1.51680 64.20 0.53430 32 ∞ 1.000

[0456] [Table 44]

[0457] Example 12

[0458] f 77.634 FNo. 1.65 2ωmax 20.8

[0459] [Table 45]

[0460] Example 12

[0461] Infinity 0.7m DD

[15] 5.000 19.027 DD

[21] 14.908 0.881

[0462] [Example 13]

[0463] The cross-sectional structure of the imaging lens in Example 13 is shown below. Figure 37The imaging lens of Embodiment 13 comprises, from the object side, a first lens group G1 with positive refractive power and a second lens group G2 with positive refractive power. When focusing from an object at infinity to the nearest object, the first lens group G1 is fixed relative to the image plane Sim, while the second lens group G2 moves along the optical axis Z towards the object side. The first lens group G1, from the object side, comprises eight lenses, L1a to L1h. The second lens group G2, from the object side, comprises lenses L2a to L2c, an aperture St, and lenses L2d to L2g.

[0464] Regarding the imaging lens of Example 13, the basic lens data is shown in Table 46, the specifications are shown in Table 47, the variable surface spacing is shown in Table 48, the aspherical coefficients are shown in Table 49, and the various aberrations are illustrated in Table 40. Figure 38 and Figure 39 .exist Figure 38 The upper section shows the aberration diagrams for an object focused at infinity, while the lower section shows the aberration diagrams for an object focused at a distance of 0.4 m from the image plane Sim. Figure 39 The image shows a lateral aberration diagram of a state focused on an object at infinity.

[0465] [Table 46]

[0466] Example 13

[0467] Sn R D Nd vd θgF 1 -80.28635 2.000 1.48749 70.24 0.53007 2 42.98733 13.000 3 -63.79046 1.860 1.62004 36.26 0.58800 4 51.39741 12.441 1.88299 40.78 0.56829 5 -144.73231 0.100 6 176.27919 7.877 2.00069 25.46 0.61364 7 -160.05852 0.100 8 24017.51177 11.145 1.49700 81.54 0.53748 9 -53.46758 2.020 1.95906 17.47 0.65993 10 -141.76150 0.100 11 73.80784 6.228 1.43875 94.66 0.53402 12 -6705.69476 0.100 13 135.56611 4.200 1.49700 81.54 0.53748 14 188.15073 DD

[14] 15 48.95259 5.513 1.95906 17.47 0.65993 16 205.45635 0.253 17 25.65935 8.918 1.59282 68.62 0.54414 18 -442.23226 1.200 1.80809 22.76 0.63073 19 17.92257 5.504 20(St) ∞ 5.000 *21 -17.88285 1.500 1.68948 31.02 0.59874 *22 -49.72259 0.500 23 213.02720 6.649 1.81600 46.62 0.55682 24 -19.33525 1.120 1.62004 36.26 0.58800 25 47.67656 6.689 1.88299 40.78 0.56829 26 -31.38846 DD

[26] 27 ∞ 2.850 1.51680 64.20 0.53430 28 ∞ 1.000

[0468] [Table 47]

[0469] Example 13

[0470] f 32.024 FNo. 1.03 2ωmax 49.0

[0471] [Table 48]

[0472] Example 13

[0473] Infinity 0.4m DD

[14] 5.524 1.833 DD

[26] 14.098 17.789

[0474] [Table 49]

[0475] Example 13

[0476] Sn 21 22 KA 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 A4 1.7715606E-04 1.7642986E-04 A5 1.7074166E-05 1.6476812E-05 A6 -5.3189612E-06 -4.6629565E-06 A7 -1.7052372E-07 -2.6282483E-07 A8 1.0629596E-07 1.1534278E-07 A9 3.7804819E-10 -2.9531996E-10 A10 -1.7627478E-09 -1.9368547E-09 A11 3.7456752E11 8.2583641E-11 A12 2.1780336E11 1.9811305E-11 A13 -1.0619291E-12 -1.3990529E-12 A14 -1.6070128E-13 -1.1461723E-13 A15 1.2952078E-14 1.1207794E-14 A16 4.9200989E-16 2.9951674E-16 A17 -7.4222889E-17 -4.5040584E-17 A18 6.6519028E-19 5.5182976E-20 A19 1.6312319E-19 7.2914615E-20 A20 -5.4198359E-21 -1.3034388E-21

[0477] [Example 14]

[0478] The cross-sectional structure of the imaging lens in Example 14 is shown below. Figure 40The imaging lens of Embodiment 14 comprises, from the object side, a first lens group G1 with positive refractive power and a second lens group G2 with positive refractive power. When focusing from an object at infinity to the nearest object, the first lens group G1 is fixed relative to the image plane Sim, while the second lens group G2 moves along the optical axis Z towards the object side. The first lens group G1, from the object side, comprises eight lenses, L1a to L1h. The second lens group G2, from the object side, comprises lenses L2a to L2c, an aperture St, and lenses L2d to L2f.

[0479] Regarding the imaging lens of Example 14, the basic lens data is shown in Table 50, the specifications are shown in Table 51, the variable surface spacing is shown in Table 52, the aspherical coefficients are shown in Table 53, and the various aberrations are illustrated in Table 54. Figure 41 and Figure 42 .exist Figure 41 The upper section shows the aberration diagrams for an object focused at infinity, while the lower section shows the aberration diagrams for an object focused at a distance of 0.3 m from the image plane Sim. Figure 42 The image shows a lateral aberration diagram of a state focused on an object at infinity.

[0480] [Table 50]

[0481] Example 14

[0482] Sn R D Nd vd θgF 1 -741.84965 4.557 2.00001 16.35 0.64993 2 133.27267 2.137 3 -88.69549 2.000 1.51957 51.33 0.55675 4 30.12135 17.951 5 -43.59777 1.860 1.72220 28.89 0.60118 6 50.07951 14.509 1.99166 26.42 0.61104 7 -73.94447 0.200 8 102.81602 12.918 1.72183 55.41 0.54271 9 -47.50103 2.020 1.96573 16.71 0.64633 10 -188.35959 0.100 11 282.52887 4.513 1.43875 94.66 0.53402 12 -146.67361 0.010 13 51.37757 3.531 1.59522 67.73 0.54426 14 63.46607 DD

[14] 15 49.82440 5.000 2.00001 15.00 0.65515 16 197.53926 0.250 17 27.63615 9.109 1.59522 67.73 0.54426 18 -134.79322 1.550 1.85370 22.31 0.62213 19 18.23355 5.500 20(St) ∞ 5.487 21 -18.30655 1.500 1.63029 39.17 0.57925 22 -48.92302 5.529 1.48984 65.39 0.53509 23 -24.64229 0.100 *24 56.89240 6.000 1.79341 48.66 0.55129 *25 -36.65031 DD

[25] 26 ∞ 2.850 1.51680 64.20 0.53430 27 ∞ 1.000

[0483] [Table 51]

[0484] Example 14

[0485] f 29.079 FNo. 1.03 2ωmax 53.2

[0486] [Table 52]

[0487] Example 14

[0488] Infinity 0.3m DD

[14] 6.500 1.921 DD

[25] 16.342 20.921

[0489] [Table 53]

[0490] Example 14

[0491] Sn 24 25 KA 1.0000000E+00 1.0000000E+00 A4 -1.6809135E-06 8.5774318E-06 A6 -2.1517689E-07 -2.0857403E-07 A8 9.2942401E-09 6.7208947E-09 A10 -2.1073323E-10 -1.2334691E-10 A12 2.8305897E-12 1.3706654E-12 A14 -2.3236997E-14 -9.4138699E-15 A16 1.1475262E-16 3.9270429E-17 A18 -3.1366558E-19 -9.1668061E-20 A20 3.6536989E-22 9.2574233E-23

[0492] [Example 15]

[0493] The cross-sectional structure of the imaging lens in Example 15 is shown below. Figure 43The imaging lens of Embodiment 15 comprises, from the object side, a first lens group G1 with positive refractive power and a second lens group G2 with positive refractive power. When focusing from an object at infinity to the nearest object, the first lens group G1 is fixed relative to the image plane Sim, while the second lens group G2 moves along the optical axis Z towards the object side. The first lens group G1, from the object side, comprises eight lenses, L1a to L1h. The second lens group G2, from the object side, comprises lenses L2a to L2c, an aperture St, and lenses L2d to L2g.

[0494] Regarding the imaging lens of Example 15, the basic lens data is shown in Table 54, the specifications are shown in Table 55, the variable surface spacing is shown in Table 56, the aspherical coefficients are shown in Table 57, and the various aberrations are illustrated in Table 58. Figure 44 and Figure 45 .exist Figure 44 The upper section shows the aberration diagrams for an object focused at infinity, while the lower section shows the aberration diagrams for an object focused at a distance of 0.3 m from the image plane Sim. Figure 45 The image shows a lateral aberration diagram of a state focused on an object at infinity.

[0495] [Table 54]

[0496] Example 15

[0497] Sn R D Nd vd θgF 1 642.95860 5.882 2.00001 16.89 0.64786 2 -164.66697 1.863 3 -99.52183 2.000 1.61064 54.41 0.55296 4 33.83357 15.951 5 -47.68180 1.860 1.70668 31.21 0.59581 6 51.06375 13.761 1.98542 25.79 0.61339 7 -87.22549 0.200 8 126.67025 12.325 1.72259 55.37 0.54271 9 -47.54495 2.020 1.97455 17.92 0.64243 10 -275.27420 0.100 11 171.98328 5.821 1.43875 94.66 0.53402 12 -113.39789 0.010 13 46.43027 5.041 1.59522 67.73 0.54426 14 84.61748 DD

[14] 15 55.77297 4.000 2.00000 15.00 0.65515 16 202.80478 0.605 17 27.63715 8.988 1.58689 61.66 0.54186 18 -134.09655 1.550 1.85789 22.11 0.62292 19 19.09448 5.638 20(St) ∞ 5.927 *21 -28.03700 1.500 1.89872 28.11 0.60520 *22 -44.46753 1.250 23 -96.25411 6.671 1.74032 53.97 0.54394 24 -23.20962 0.500 25 63.33337 6.000 1.90048 37.95 0.57345 26 -32.84508 1.310 1.47999 58.75 0.54320 27 33.51612 DD

[27] 28 ∞ 2.850 1.51680 64.20 0.53430 29 ∞ 1.000

[0498] [Table 55]

[0499] Example 15

[0500] f 29.906 FNo. 1.03 2ωmax 51.4

[0501] [Table 56]

[0502] Example 15

[0503] Infinity 0.3m DD

[14] 6.500 1.468 DD

[27] 11.900 16.932

[0504] [Table 57]

[0505] Example 15

[0506] Sn 21 22 KA 1.0000000E+00 1.0000000E+00 A4 -5.0827829E-05 -2.1426467E-05 A6 -1.1853379E-07 -4.7548185E-08 A8 9.4795512E-09 5.2403072E-09 A10 -2.7750209E-10 -1.0968658E-10 A12 5.8490730E-12 2.0277440E-12 A14 -7.6027021E-14 -2.5419242E-14 A16 5.7225628E-16 1.8641103E-16 A18 -2.2972054E-18 -7.2476475E-19 A20 3.8030548E-21 1.1546366E-21

[0507] [Example 16]

[0508] The cross-sectional structure of the imaging lens in Example 16 is shown below. Figure 46The imaging lens of Embodiment 16, from the object side, sequentially comprises a first lens group G1 with positive refractive power, a second lens group G2 with positive refractive power, and a third lens group G3 with negative refractive power. When focusing from an object at infinity to the nearest object, the first lens group G1 and the third lens group G3 are fixed relative to the image plane Sim, while the second lens group G2 moves along the optical axis Z towards the object side. The first lens group G1, from the object side, comprises seven lenses L1a to L1g. The second lens group G2, from the object side, comprises lenses L2a to L2c, an aperture St, and lenses L2d to L2f. The third lens group G3, from the object side, comprises two lenses L3a to L3b.

[0509] Regarding the imaging lens of Example 16, the basic lens data is shown in Table 58, the specifications are shown in Table 59, the variable surface spacing is shown in Table 60, the aspherical coefficients are shown in Table 61, and the various aberrations are illustrated in Table 58. Figure 47 and Figure 48 .exist Figure 47 The upper section shows the aberration diagrams for an object focused at infinity, while the lower section shows the aberration diagrams for an object focused at a distance of 0.3 m from the image plane Sim. Figure 48 The image shows a lateral aberration diagram of a state focused on an object at infinity.

[0510] [Table 58]

[0511] Example 16

[0512] Sn R D Nd vd θgF 1 -297.13714 7.166 1.87070 40.73 0.56825 2 -85.86719 1.000 3 -73.16221 2.000 1.74077 27.79 0.60961 4 42.66024 7.413 5 392.24356 6.462 1.87070 40.73 0.56825 6 -146.01920 4.000 7 -66.16556 1.860 1.72825 28.46 0.60772 8 51.18899 11.866 2.10420 17.02 0.66311 9 -245.64485 0.200 10 77.22649 15.828 1.88300 40.80 0.56557 11 -47.49919 2.020 1.98613 16.48 0.66558 12 -198.94323 DD

[12] 13 55.79899 6.000 1.92286 20.88 0.63900 14 1076.94076 0.250 15 30.39757 10.286 1.59410 60.47 0.55516 16 -49.75521 1.550 1.92286 20.88 0.63900 17 20.04359 5.500 18 (St) ∞ 5.642 19 -22.24985 1.510 1.59270 35.31 0.59336 20 30.44450 8.452 1.90043 37.37 0.57668 21 -37.69952 0.270 *22 87.14518 3.500 1.83481 42.72 0.56486 *23 -62.14252 DD

[23] 24 -134.06447 3.010 1.64000 60.08 0.53704 25 -34.88724 1.000 1.65412 39.68 0.57378 26 -129.28425 12.064 27 ∞ 2.850 1.51680 64.20 0.53430 28 ∞ 1.000

[0513] [Table 59]

[0514] Example 16

[0515] f 33.489 FNo. 1.03 2ωmax 46.8

[0516] [Table 60]

[0517] Example 16

[0518] Infinity 0.3m DD

[12] 6.714 0.856 DD

[23] 2.000 7.858

[0519] [Table 61]

[0520] Example 16

[0521] Sn 22 23 KA 1.0000000E+00 1.0000000E+00 A4 -5.8591082E-06 2.8872810E-06 A6 8.0450854E-09 -1.4218337E-08 A8 -1.8982768E-10 4.2017521E-11 A10 6.8830323E-13 -2.5968320E-13 A12 -2.8216339E-15 -1.0662872E-15

[0522] [Example 17]

[0523] The cross-sectional structure of the imaging lens in Example 17 is shown below. Figure 49The imaging lens of Example 17 comprises, from the object side, a first lens group G1 with positive refractive power and a second lens group G2 with positive refractive power. When focusing from an object at infinity to the nearest object, the first lens group G1 is fixed relative to the image plane Sim, while the second lens group G2 moves along the optical axis Z towards the object side. The first lens group G1, from the object side, comprises nine lenses L1a to L1i. The second lens group G2, from the object side, comprises lenses L2a to L2c, an aperture St, and lenses L2d to L2g.

[0524] Regarding the imaging lens of Example 17, the basic lens data is shown in Table 62, the specifications are shown in Table 63, the variable surface spacing is shown in Table 64, the aspherical coefficients are shown in Table 65, and the various aberrations are illustrated in Table 66. Figure 50 and Figure 51 .exist Figure 50 The upper section shows the aberration diagrams for an object focused at infinity, while the lower section shows the aberration diagrams for an object focused at a distance of 0.4 m from the image plane Sim. Figure 51 The image shows a lateral aberration diagram of a state focused on an object at infinity.

[0525] [Table 62]

[0526] Example 17

[0527] Sn R D Nd vd θgF 1 -336.27458 2.200 1.48749 70.24 0.53007 2 38.98761 15.631 3 -46.53554 2.210 1.59551 39.24 0.58043 4 249.77972 5.766 1.88300 39.22 0.57295 5 -160.59902 0.800 6 276.62948 8.350 2.00069 25.46 0.61364 7 -81.36890 3.916 8 -63.06549 2.210 1.69895 30.13 0.60298 9 135.70322 3.841 1.88300 39.22 0.57295 10 422.33573 1.500 11 102.34565 15.415 1.43875 94.66 0.53402 12 -44.71698 2.200 1.85896 22.73 0.62844 13 -77.19256 0.100 14 101.83391 9.311 1.59282 68.62 0.54414 15 -119.76934 DD

[15] 16 69.07462 5.899 1.95906 17.47 0.65993 17 449.86569 0.600 18 33.09295 10.662 1.59282 68.62 0.54414 19 -150.72672 1.700 1.85896 22.73 0.62844 20 26.86774 6.577 21 (St) ∞ 8.310 *22 -28.92910 1.800 1.68948 31.02 0.59874 *23 419.15250 1.784 24 124.99078 6.834 1.88300 39.22 0.57295 25 -19.93892 1.220 1.59270 35.31 0.59336 26 40.55156 6.493 1.87070 40.73 0.56825 27 -53.64933 DD

[27] 28 ∞ 2.850 1.51680 64.20 0.53430 29 ∞ 1.000

[0528] [Table 63]

[0529] Example 17

[0530] f 32.299 FNo. 1.03 2ωmax 49.0

[0531] [Table 64]

[0532] Example 17

[0533] Infinity 0.4m DD

[15] 5.583 1.508 DD

[27] 14.463 18.538

[0534] [Table 65]

[0535] Example 17

[0536] Sn 22 23 KA 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 A4 3.5406543E-05 4.9366505E-05 A5 7.0264041E-06 7.9379491E-06 A6 -1.1816569E-06 -1.4343119E-06 A7 -2.2756224E-07 -2.0060437E-07 A8 3.4450831E-08 4.3102131E-08 A9 5.4529188E-09 3.4605387E-09 A10 -8.2702494E-10 -9.3263727E-10 A11 -8.7833902E11 -3.7283303E-11 A12 1.3514381E-11 1.3092859E-11 A13 8.9890230E-13 2.4405774E-13 A14 -1.4076774E-13 -1.1755255E-13 A15 -5.5890568E-15 -9.1931741E-16 A16 8.9135105E-16 6.5486383E-16 A17 1.9220049E-17 1.7211209E-18 A18 -3.1226127E-18 -2.0673300E-18 A19 -2.7989666E-20 -1.0111723E-21 A20 4.6368363E-21 2.8305920E-21

[0537] [Example 18]

[0538] The cross-sectional structure of the imaging lens of Example 18 is shown below. Figure 52The imaging lens of Embodiment 18, from the object side, sequentially includes a first lens group G1 with positive refractive power, an aperture St, a second lens group G2 with positive refractive power, and a third lens group G3 with negative refractive power. When focusing from an object at infinity to the nearest object, the first lens group G1 and the third lens group G3 are fixed relative to the image plane Sim, while the second lens group G2 moves along the optical axis Z towards the object side. The first lens group G1, from the object side, includes 13 lenses, L1a to L1m. The second lens group G2, from the object side, includes 4 lenses, L2a to L2d. The third lens group G3 includes a single lens, L3a.

[0539] Regarding the imaging lens of Example 18, basic lens data is shown in Table 66, specifications are shown in Table 67, variable surface spacing is shown in Table 68, aspherical coefficients are shown in Table 69, and various aberrations are illustrated in Table 60. Figure 53 and Figure 54 .exist Figure 53 The upper section shows the aberration diagrams for an object focused at infinity, while the lower section shows the aberration diagrams for an object focused at a distance of 0.4 m from the image plane Sim. Figure 54 The image shows a lateral aberration diagram of a state focused on an object at infinity.

[0540] [Table 66]

[0541] Example 18

[0542] Sn R D Nd vd θgF 1 -633.25261 2.000 1.59551 39.24 0.58043 2 38.00665 12.863 3 -54.28519 1.850 1.80100 34.97 0.58642 4 95.00850 10.922 1.71300 53.87 0.54587 5 -67.98194 0.100 6 95.72298 6.765 2.00272 19.32 0.64514 7 -251.63874 1.000 8 -246.42407 6.991 1.80100 34.97 0.58642 9 -53.58723 1.610 1.69895 30.13 0.60298 10 99.80167 0.909 11 137.54054 10.681 1.62041 60.29 0.54266 12 -52.34651 2.010 1.60342 38.03 0.58356 13 -414.75790 0.100 14 143.20008 3.225 1.69680 55.53 0.54341 15 366.55185 0.462 16 51.74239 6.881 1.91082 35.25 0.58224 17 180.97539 0.260 18 35.24471 11.944 1.81600 46.62 0.55682 19 -93.14313 1.010 1.72825 28.46 0.60772 20 79.60733 0.642 21 118.00563 1.300 1.85896 22.73 0.62844 22 22.08603 7.000 23 (St) ∞ DD

[23] *24 -18.33819 1.700 1.68948 31.02 0.59874 *25 -31.12948 0.100 26 111.28451 5.800 1.87070 40.73 0.56825 27 -25.06585 1. 220 1.69895 30.13 0.60298 28 182.89249 6.206 1.81600 46.62 0.55682 29 -28.43888 DD

[29] 30 -125.00563 1.300 1.51742 52.43 0.55649 31 ∞ 11.118 32 ∞ 2.150 1.54763 54.98 0.55247 33 ∞ 1.317 34 ∞ 0.700 1.49784 54.98 0.55000 35 ∞ 1.000

[0543] [Table 67]

[0544] Example 18

[0545] f 32.025 FNo. 1.03 2ωmax 48.4

[0546] [Table 68]

[0547] Example 18

[0548] Infinity 0.4m DD

[23] 10.027 6.297 DD

[29] 1.500 5.230

[0549] [Table 69]

[0550] Example 18

[0551] Sn 24 25 KA 1.0000000E+00 1.0000000E+00 A4 7.6509788E-05 8.6420274E-05 A6 -1.2736248E-06 -6.0388926E-07 A8 5.0778640E-08 1.1474585E-08 A10 -1.3097284E-09 -7.5854198E-11 A12 2.0623870E-11 -1.6331770E-12 A14 -2.0059301E-13 3.9524334E-14 A16 1.1722812E-15 -3.5644909E-16 A18 -3.7566167E-18 1.5341315E-18 A20 5.0432936E-21 -2.6183645E-21

[0552] [Example 19]

[0553] The cross-sectional structure of the imaging lens of Example 19 is shown below. Figure 55The imaging lens of Embodiment 19, from the object side, sequentially includes a first lens group G1 with positive refractive power, an aperture St, and a second lens group G2 with positive refractive power. When focusing from an object at infinity to the nearest object, the first lens group G1 is fixed relative to the image plane Sim, and the second lens group G2 moves along the optical axis Z towards the object side. The first lens group G1, from the object side, sequentially includes 12 lenses L1a to L1l. The second lens group G2, from the object side, sequentially includes 4 lenses L2a to L2d.

[0554] Regarding the imaging lens of Example 19, basic lens data is shown in Table 70, specifications are shown in Table 71, variable surface spacing is shown in Table 72, aspherical coefficients are shown in Table 73, and various aberrations are illustrated in Table 74. Figure 56 and Figure 57 .exist Figure 56 The upper section shows the aberration diagrams for an object focused at infinity, while the lower section shows the aberration diagrams for an object focused at a distance of 0.4 m from the image plane Sim. Figure 57 The image shows a lateral aberration diagram of a state focused on an object at infinity.

[0555] [Table 70]

[0556] Example 19

[0557] Sn R D Nd vd θgF 1 -158.58566 2.000 1.56926 62.34 0.54137 2 45.50663 11.311 3 -58.28419 1.860 1.82401 23.80 0.61679 4 41.90339 13.828 1.88018 21.34 0.62618 5 -101.81510 0.100 6 98.28394 8.000 1.99999 15.00 0.65515 7 -127.35841 0.100 8 -132.35649 1.600 1.85117 22.44 0.62166 9 84.30253 1.535 10 137.70215 12.985 1.66628 58.19 0.54256 11 -39.49589 2.000 1.86788 21.61 0.62483 12 -124.45426 0.100 13 73.44245 7.449 1.82042 45.96 0.55588 14 -358.81915 0.000 15 52.60700 4.584 1.71060 55.97 0.54269 16 93.76319 0.250 17 35.01559 11.718 1.81600 46.62 0.55682 18 -112.02490 1.000 1.83429 23.29 0.61859 19 45.38534 0.919 20 60.40304 1.300 1.80688 24.66 0.61389 21 21.37711 7.000 22 (St) ∞ DD

[22] 23 -24.07079 1.400 1.48001 58.75 0.54321 24 352.80309 0.100 25 39.97798 8.898 1.94001 31.43 0.59353 26 -30.93442 1.210 1.76519 26.74 0.60732 27 59.03069 1. 000 *28 53.18296 5.500 1.80610 40.73 0.56940 *29 -44.23856 DD

[29] 30 ∞ 2.150 1.54763 54.98 0.55247 31 ∞ 1.320 32 ∞ 0.700 1.49784 54.98 0.55000 33 ∞ 1.000

[0558] [Table 71]

[0559] Example 19

[0560] f 32.017 FNo. 1.03 2ωmax 49.0

[0561] [Table 72]

[0562] Example 19

[0563] Infinity 0.4m DD

[22] 10.229 5.964 DD

[29] 11.831 16.096

[0564] [Table 73]

[0565] Example 19

[0566]

[0567]

[0568] [Example 20]

[0569] The cross-sectional structure of the imaging lens of Example 20 is shown below. Figure 58The imaging lens of Embodiment 20, from the object side, sequentially includes a first lens group G1 with positive refractive power, an aperture St, a second lens group G2 with positive refractive power, and a third lens group G3 with positive refractive power. When focusing from an object at infinity to the nearest object, the first lens group G1 and the third lens group G3 are fixed relative to the image plane Sim, while the second lens group G2 moves along the optical axis Z towards the object side. The first lens group G1, from the object side, sequentially includes 14 lenses L1a to L1n. The second lens group G2, from the object side, sequentially includes 4 lenses L2a to L2d. The third lens group G3 includes a single lens L3a.

[0570] Regarding the imaging lens of Example 20, basic lens data are shown in Table 74, specifications are shown in Table 75, variable surface spacing is shown in Table 76, aspherical coefficients are shown in Table 77, and various aberrations are illustrated in Table 78. Figure 59 and Figure 60 .exist Figure 59 The upper section shows the aberration diagrams for an object focused at infinity, while the lower section shows the aberration diagrams for an object focused at a distance of 0.6 m from the image plane Sim. Figure 60 The image shows a lateral aberration diagram of a state focused on an object at infinity.

[0571] [Table 74]

[0572] Example 20

[0573] Sn R D Nd vd θgF 1 -69.40351 2.000 1.58913 61.13 0.54067 2 47.39750 10.135 3 -65.36696 1.860 1.85896 22.73 0.62844 4 898.20220 6.892 1.88300 39.22 0.57295 5 -80.44512 0.100 6 97.48909 5.741 1.98613 16.48 0.66558 7 -546.89782 2.000 8 -171.12562 5.073 1.88300 39.22 0.57295 9 -63.25974 1.610 1.60342 38.03 0.58356 10 111.43989 1.962 11 341.07330 13.611 1.62041 60.29 0.54266 12 -34.36799 2.010 1.59270 35.31 0.59336 13 -113.99006 0.100 14 276.49914 3.956 1.59282 68.62 0.54414 15 -272.14204 0.100 16 88.96039 4.616 1.59282 68.62 0.54414 17 546.58221 0.100 18 109.73550 3.000 1.63854 55.38 0.54858 19 235.51602 0.000 20 32.76798 13.753 1.75500 52.32 0.54737 21 -86.78027 1.010 1.74000 28.30 0.60790 22 46.97326 0.897 23 62.86769 1.300 1.80518 25.42 0.61616 24 24.63660 7.000 25 (St) ∞ DD

[25] *26 -14.19913 1.700 1.68948 31.02 0.59874 *27 -19.92300 0.100 30 217.66762 5.000 1.87070 40.73 0.56825 30 -32.97025 1.220 1.69895 30.13 0.60298 30 -98.98873 5.691 1.88300 39.22 0.57295 31 -31.65160 DD

[31] 32 300.00000 1.800 1.48749 70.24 0.53007 33 ∞ 11.121 34 ∞ 2.150 1.54763 54.98 0.55247 35 ∞ 1.315 36 ∞ 0.700 1.49784 54.98 0.55000 37 ∞ 1.000

[0574] [Table 75]

[0575] Example 20

[0576] f 32.027 FNo. 1.03 2ωmax 49.4

[0577] [Table 76]

[0578] Example 20

[0579] Infinity 0.6m DD

[25] 11.613 8.481 DD

[31] 1.500 4.632

[0580] [Table 77]

[0581] Example 20

[0582] Sn 26 27 KA 1.0000000E+00 1.0000000E+00 A4 1.6825325E-04 1.4660302E-04 A6 -2.4177276E-06 -1.2134963E-06 A8 9.3324700E-08 1.6766078E-08 A10 -2.2900676E-09 1.0718903E-10 A12 3.4816388E-11 -8.2761040E-12 A14 -3.2819139E-13 1.3329649E-13 A16 1.8701820E-15 -1.0468186E-15 A18 -5.8954769E-18 4.1491271E-18 A20 7.8960041E-21 -6.6428045E-21

[0583] Tables 78 to 82 show the corresponding values ​​of conditional equations (1) to (19) for the imaging lenses of Examples 1 to 20. Examples including multiple LA positive lenses LA show the values ​​of all LA positive lenses LA. Examples 1 to 20 use the d-line as the reference wavelength. Tables 78 to 82 show the values ​​based on the d-line reference. ΔθgFA, ΔθgFB, and ΔθgFn1 in Tables 78 to 82 represent the following values ​​respectively.

[0584] Δ θgFA=θgFA+0.00162×v dA-0.64159

[0585] Δ θgFB=θgFB+0.00162×v dB-0.64159

[0586] Δ θgFn1=θgFn1+0.00162×ν dn1-0.64159

[0587] [Table 78]

[0588] Formula number Example 1 Example 2 Example 3 Example 4 (1) NdA 2.00272 1.92286 1.95906 1.98613 (2) v dA 19.32 20.88 17.47 16.48 (3) v dB 90.19 81.61 68.62 68.62 (4) v dn1 19.61 18.42 21.56 21.55 (5) TL×FNo / f 2.246 2.417 2.293 2.225 (6) v dC 68.62 81.61 68.62 68.62 (7) Ndfm 1.45860 1.49700 1.59282 1.59282 (8) Ndpr 1.93784 2.00100 1.88300 1.88300 (9) Nd2p 1.95375 2.00100 1.88300 1.88300 (10) f1 / f 2.568 2.372 2.311 2.184 (11) 1 / {tan(ωmax)×FNo} 3.555 3.375 3.448 3.330 (12) |f2| / f 0.795 0.721 0.705 0.699 (13) f1 / f2 3.231 3.288 3.281 3.122 (14) <![CDATA[|(1-β2 2 )×βr 2 |]]> 0.692 0.822 0.813 0.790 (15) Tf / TL 0.544 0.576 0.547 0.534 (16) f / fm 0.859 0.803 0.872 0.825 (17) Δ θgFA 0.03485 0.03124 0.04664 0.05069 (18) Δ θgFB 0.03968 0.02949 0.01371 0.01371 (19) Δ θgFn1 0.03718 0.04076 0.02842 0.02725

[0589] [Table 79]

[0590] Formula number Example 5 Example 6 Example 7 Example 8 (1) NdA 1.89286 1.92286 2.10420 2.00069 (2) v dA 20.36 18.90 17.02 25.46 (3) v dB 67.73 74.70 94.66 75.50 (4) v dn1 23.02 22.62 20.89 24.40 (5) TL×FNo / f 2.230 2.443 2.660 2.262 (6) v dC 67.73 74.70 94.66 75.50 (7) Ndfm 1.59522 1.53775 1.43875 1.55032 (8) Ndpr 1.90043 1.85067 1.84786 1.86725 (9) Nd2p 1.90043 1.85067 1.84786 1.86725 (10) f1 / f 2.366 2.003 2.051 2.513 (11) 1 / {tan(ωmax)×FNo} 3.462 3.329 3.279 3.512 (12) |f2| / f 0.684 0.715 0.730 0.661 (13) f1 / f2 3.457 2.800 2.808 3.800 (14) <![CDATA[-(1-β2 2 )×βr 2 |]]> 0.821 0.751 0.762 0.842 (15) Tf / TL 0.540 0.589 0.620 0.550 (16) f / fm 0.860 0.822 0.796 0.933 (17) Δ θgFA 0.03083 0.03863 0.04909 0.01330 (18) Δ θgFB 0.01239 0.01878 0.04578 0.02073 (19) Δ θgFn1 0.02068 0.01986 0.02360 0.01811

[0591] [Table 80]

[0592] Formula number Example 9 Example 10 Example 11 Example 12 (1) NdA 1.92119 2.05090 1.95375 1.92119 (2) v dA 23.96 26.94 32.32 23.96 (3) v dB 81.61 68.62 94.66 75.50 (4) v dn1 23.02 22.73 27.01 24.10 (5) TL×FNo / f 2.244 2.709 2.685 2.740 (6) v dC 81.61 68.62 90.19 67.73 (7) Ndfm 1.49700 1.56883 1.43875 1.55032 (8) Ndpr 1.88300 1.73630 1.82897 1.78517 (9) Nd2p 1.88300 1.79841 1.93835 1.83756 (10) f1 / f 2.380 0.872 1.076 1.050 (11) 1 / {tan(ωmax)×FNo} 3.482 3.302 3.395 3.309 (12) |f2| / f 0.679 0.583 0.851 0.786 (13) f1 / f2 3.503 - - - (14) <![CDATA[|(1-β2 2 )×βr 2 |]]> 0.823 1.294 0.821 0.875 (15) Tf / TL 0.546 0.285 0.335 0.339 (16) f / fm 0.856 - 0.925 0.955 (17) Δ θgFA 0.01748 0.00724 0.00092 0.01748 (18) Δ θgFB 0.02949 0.01371 0.04578 0.02073 (19) Δ θgFn1 0.02068 0.02367 0.01127 0.01848

[0593] [Table 81]

[0594]

[0595] [Table 82]

[0596]

[0597] The imaging lenses of Examples 1 to 20 have an F-number of less than 2. In particular, the imaging lenses of Examples 1 to 9 have an F-number of less than 1.2. The imaging lenses of Examples 1 to 20 have such small F-numbers and achieve miniaturization, and all aberrations are well corrected, thereby achieving high optical performance.

[0598] Next, the imaging device according to the embodiments of the present invention will be described. Figure 61 and Figure 62 The diagram shows an external view of a camera 30, an imaging device according to an embodiment of the present invention. Figure 61 This indicates a stereoscopic view of camera 30 viewed from the front side. Figure 62This is a perspective view of the camera 30 as seen from the rear side. The camera 30 is a so-called mirrorless digital camera, which can be detachably fitted with an interchangeable lens 20. The interchangeable lens 20 includes an imaging lens 1 according to an embodiment of the present invention, housed within a lens barrel.

[0599] The camera 30 includes a camera body 31, and a shutter button 32 and a power button 33 are provided on the upper surface of the camera body 31. Furthermore, an operation unit 34, an operation unit 35, and a display unit 36 ​​are provided on the back of the camera body 31. The display unit 36 ​​displays the captured image and the image existing within the field of view before shooting.

[0600] A shooting opening for light from the subject is provided in the center of the front of the camera body 31. A bayonet 37 is provided at the position corresponding to the shooting opening, and the interchangeable lens 20 is mounted on the camera body 31 via the bayonet 37.

[0601] The camera body 31 includes an imaging element such as a CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) that outputs an imaging signal corresponding to the image of the subject formed by the interchangeable lens 20; a signal processing circuit that processes the imaging signal output from the imaging element to generate an image; and a recording medium for recording the generated image. In this camera 30, still images or moving images can be captured by pressing the shutter button 32, and the image data obtained is recorded in the aforementioned recording medium.

[0602] The present invention has been described above with examples of embodiments and examples, but the technology of the present invention is not limited to the above embodiments and examples, and various modifications are possible. For example, the radius of curvature, surface spacing, refractive index, dispersion coefficient, and aspherical coefficient of each lens are not limited to the values ​​shown in the above numerical embodiments, and other values ​​can be used.

[0603] Furthermore, the imaging device involved in the embodiments of the present invention is not limited to the examples described above. For example, it can also be configured as a camera other than a mirrorless camera, a film camera, or a video camera, etc.

[0604] Symbol Explanation

[0605] 1-Imaging lens, 2-On-axis beam, 3-Brightness beam with maximum angle of view, 20-Interchangeable lens, 30-Camera, 31-Camera body, 32-Shutter button, 33-Power button, 34, 35-Operation unit, 36-Display unit, 37-Mount, G1-First lens group, G2-Second lens group, G3-Third lens group, Gs1-First unit, Gs2-Second unit, L1a~L1n, L2a~L2g, L3a~L3e-Lens, LA-LA positive lens, LB-LB positive lens, LC-LC positive lens, PP-Optical component, Sim-Image plane, St-Aperture, Z-Optical axis.

Claims

1. An imaging lens, The imaging lens, from the object side to the image side, sequentially comprises only two lens groups: a first lens group with positive refractive power that is fixed relative to the image plane during focusing, and a second lens group with positive refractive power that moves during focusing. The imaging lens, from the object side to the image side, consists of three lens groups in sequence: a first lens group with positive refractive power that is fixed relative to the image plane during focusing, a second lens group with refractive power that moves during focusing, and a third lens group that is fixed relative to the image plane during focusing. When only two lens groups are used, the first lens group consists of 7-9 or 12 lenses, and the second lens group consists of 4-7 lenses. When only three lens groups are used, the first lens group consists of 7-8 or 13-14 lenses, the second lens group consists of 4-6 lenses, and the third lens group consists of 1-2 or 5 lenses. During focusing, the spacing between the first lens group and the second lens group changes, while the spacing between all lenses in the first lens group and the spacing between all lenses in the second lens group remain constant. The first lens group includes at least two negative lenses. The aperture is positioned further to the image side than the second lens from the object side. The combined refractive power of all lenses closer to the object than the aperture is positive. The aperture includes at least one LA positive lens and at least one LB positive lens on the object side, which is closer to the object than the aperture. The d-line reference dispersion coefficient of the LB positive lens is the largest among all positive lenses whose d-line reference dispersion coefficients are closer to the object side than the aperture. When the refractive index of the LA positive lens relative to the d-line is set to NdA, The dispersion coefficient of the d-line reference of the LA positive lens is set as νdA. The dispersion coefficient of the d-line reference of the LB positive lens is set to νdB. The average value of the d-line dispersion coefficients of two negative lenses selected from the negative lenses included in the first lens group in ascending order of their d-line dispersion coefficients is set as νdn1. Let TL be the sum of the distance along the optical axis from the lens surface closest to the object to the lens surface closest to the image when focusing on an object at infinity, and the back focal length measured in air distance. The F-number of the imaging lens when focusing on an object at infinity is set to FNo. When the focal length of the imaging lens is set to f while focusing on an object at infinity, The imaging lens satisfies the following conditions (1), (2), (3), (4) and (5). 1.86 < NdA < 2.2 (1) 10<νdA<35 (2) 57 < νdB < 105 (3) 15<νdn1<28 (4) 1.5<TL×FNo / f<5 (5).

2. The imaging lens according to claim 1, wherein, The imaging lens satisfies the following condition (5-1). 1.8<TL×FNo / f<3.5 (5-1).

3. The imaging lens according to claim 1, wherein, The imaging lens satisfies the following condition (5-2). 2<TL×FNo / f<3.2 (5-2).

4. An imaging lens, The imaging lens, from the object side to the image side, sequentially comprises only two lens groups: a first lens group with positive refractive power that is fixed relative to the image plane during focusing, and a second lens group with positive refractive power that moves during focusing. The imaging lens, from the object side to the image side, consists of three lens groups in sequence: a first lens group with positive refractive power that is fixed relative to the image plane during focusing, a second lens group with refractive power that moves during focusing, and a third lens group that is fixed relative to the image plane during focusing. When only two lens groups are used, the first lens group consists of 7-9 or 12 lenses, and the second lens group consists of 4-7 lenses. When only three lens groups are used, the first lens group consists of 7-8 or 13-14 lenses, the second lens group consists of 4-6 lenses, and the third lens group consists of 1-2 or 5 lenses. During focusing, the spacing between the first lens group and the second lens group changes, while the spacing between all lenses in the first lens group and the spacing between all lenses in the second lens group remain constant. The first lens group includes at least two negative lenses. The aperture is positioned further to the image side than the second lens from the object side. The combined refractive power of all lenses closer to the object than the aperture is positive. The aperture includes at least one LA positive lens, at least one LB positive lens, and at least one LC positive lens on the object side closer to the aperture. The d-line reference dispersion coefficient of the LB positive lens is the largest among all positive lenses whose d-line reference dispersion coefficients are closer to the object side than the aperture. The LC positive lens is a positive lens that has the largest or second largest d-line reference dispersion coefficient among all positive lenses that are closer to the object side than the aperture. When the refractive index of the LA positive lens relative to the d-line is set to NdA, The dispersion coefficient of the d-line reference of the LA positive lens is set as νdA. The dispersion coefficient of the d-line reference of the LB positive lens is set to νdB. The average value of the d-line dispersion coefficients of two negative lenses selected from the negative lenses included in the first lens group in ascending order of their d-line dispersion coefficients is set as νdn1. The dispersion coefficient of the d-line reference of the LC positive lens is set as νdC. The maximum half-angle of the imaging lens when focusing on an object at infinity is set to ωmax. When the F-number of the imaging lens is set to FNo while focusing on an object at infinity, The imaging lens satisfies the following conditions (1), (2), (3), (4), (6) and (11-1). 1.86 < NdA < 2.2 (1) 10<νdA<35 (2) 57 < νdB < 105 (3) 15<νdn1<28 (4) 57<νdC<102 (6) 2.4<1 / {tan(ωmax)×FNo}<4.2 (11-1).

5. The imaging lens according to claim 1 or 4, wherein, The imaging lens satisfies the following condition (4-1). 16<νdn1<25 (4-1)。 6. The imaging lens according to claim 4, wherein, The imaging lens satisfies the following condition (6-1). 62<νdC<88 (6-1)。 7. The imaging lens according to claim 4, wherein, The imaging lens satisfies the following condition (6-2). 66<νdC<80 (6-2).

8. An imaging lens, The imaging lens, from the object side to the image side, sequentially comprises only two lens groups: a first lens group with positive refractive power that is fixed relative to the image plane during focusing, and a second lens group with positive refractive power that moves during focusing. The imaging lens, from the object side to the image side, consists of three lens groups in sequence: a first lens group with positive refractive power that is fixed relative to the image plane during focusing, a second lens group with refractive power that moves during focusing, and a third lens group that is fixed relative to the image plane during focusing. When only two lens groups are used, the first lens group consists of 7-9 or 12 lenses, and the second lens group consists of 4-7 lenses. When only three lens groups are used, the first lens group consists of 7-8 or 13-14 lenses, the second lens group consists of 4-6 lenses, and the third lens group consists of 1-2 or 5 lenses. During focusing, the spacing between the first lens group and the second lens group changes, while the spacing between all lenses in the first lens group and the spacing between all lenses in the second lens group remain constant. The aperture is positioned further to the image side than the second lens from the object side. The combined refractive power of all lenses closer to the object than the aperture is positive. The aperture includes at least one LA positive lens and at least one LB positive lens on the object side, which is closer to the object than the aperture. The first lens group includes at least one of the LA positive lenses. The d-line reference dispersion coefficient of the LB positive lens is the largest among all positive lenses whose d-line reference dispersion coefficients are closer to the object side than the aperture. When the refractive index of the LA positive lens relative to the d-line is set to NdA, The dispersion coefficient of the d-line reference of the LA positive lens is set as νdA. The dispersion coefficient of the d-line reference of the LB positive lens is set to νdB. The maximum half-angle of the imaging lens when focusing on an object at infinity is set to ωmax. When the F-number of the imaging lens is set to FNo while focusing on an object at infinity, The imaging lens satisfies the following conditions (1), (2), (3) and (11-1). 1.86 < NdA < 2.2 (1) 10<νdA<35 (2) 57 < νdB < 105 (3) 2.4<1 / {tan(ωmax)×FNo}<4.2 (11-1).

9. An imaging lens, The imaging lens, from the object side to the image side, sequentially comprises only two lens groups: a first lens group with positive refractive power that is fixed relative to the image plane during focusing, and a second lens group with positive refractive power that moves during focusing. The imaging lens, from the object side to the image side, consists of three lens groups in sequence: a first lens group with positive refractive power that is fixed relative to the image plane during focusing, a second lens group with refractive power that moves during focusing, and a third lens group that is fixed relative to the image plane during focusing. When only two lens groups are used, the first lens group consists of 7-9 or 12 lenses, and the second lens group consists of 4-7 lenses. When only three lens groups are used, the first lens group consists of 7-8 or 13-14 lenses, the second lens group consists of 4-6 lenses, and the third lens group consists of 1-2 or 5 lenses. During focusing, the spacing between the first lens group and the second lens group changes, while the spacing between all lenses in the first lens group and the spacing between all lenses in the second lens group remain constant. The lens closest to the object is the negative lens. The aperture is positioned further to the image side than the second lens from the object side. The combined refractive power of all lenses closer to the object than the aperture is positive. The aperture includes at least one LA positive lens and at least one LB positive lens on the object side, which is closer to the object than the aperture. The d-line reference dispersion coefficient of the LB positive lens is the largest among all positive lenses whose d-line reference dispersion coefficients are closer to the object side than the aperture. When the refractive index of the LA positive lens relative to the d-line is set to NdA, The dispersion coefficient of the d-line reference of the LA positive lens is set as νdA. The dispersion coefficient of the d-line reference of the LB positive lens is set to νdB. The maximum half-angle of the imaging lens when focusing on an object at infinity is set to ωmax. When the F-number of the imaging lens is set to FNo while focusing on an object at infinity, The imaging lens satisfies the following conditions (1), (2), (3) and (11-1). 1.86 < NdA < 2.2 (1) 10<νdA<35 (2) 57 < νdB < 105 (3) 2.4<1 / {tan(ωmax)×FNo}<4.2 (11-1).

10. An imaging lens, The imaging lens, from the object side to the image side, sequentially comprises only two lens groups: a first lens group with positive refractive power that is fixed relative to the image plane during focusing, and a second lens group with positive refractive power that moves during focusing. The imaging lens, from the object side to the image side, consists of three lens groups in sequence: a first lens group with positive refractive power that is fixed relative to the image plane during focusing, a second lens group with refractive power that moves during focusing, and a third lens group that is fixed relative to the image plane during focusing. When only two lens groups are used, the first lens group consists of 7-9 or 12 lenses, and the second lens group consists of 4-7 lenses. When only three lens groups are used, the first lens group consists of 7-8 or 13-14 lenses, the second lens group consists of 4-6 lenses, and the third lens group consists of 1-2 or 5 lenses. During focusing, the spacing between the first lens group and the second lens group changes, while the spacing between all lenses in the first lens group and the spacing between all lenses in the second lens group remain constant. The aperture is positioned further to the image side than the second lens from the object side. The combined refractive power of all lenses closer to the object than the aperture is positive. The aperture includes at least one LA positive lens and at least one LB positive lens on the object side, which is closer to the object than the aperture. The d-line reference dispersion coefficient of the LB positive lens is the largest among all positive lenses whose d-line reference dispersion coefficients are closer to the object side than the aperture. When the refractive index of the LA positive lens relative to the d-line is set to NdA, The dispersion coefficient of the d-line reference of the LA positive lens is set as νdA. The dispersion coefficient of the d-line reference of the LB positive lens is set to νdB. Set the focal length of the first lens group to f1. The focal length of the imaging lens when focusing on an object at infinity is set to f. The maximum half-angle of the imaging lens when focusing on an object at infinity is set to ωmax. When the F-number of the imaging lens is set to FNo while focusing on an object at infinity, The imaging lens satisfies the following conditions (1), (2), (3), (10-3) and (11-1). 1.86 < NdA < 2.2 (1) 10<νdA<35 (2) 57 < νdB < 105 (3) 1.8 < f1 / f < 2.9 (10-3) 2.4<1 / {tan(ωmax)×FNo}<4.2 (11-1).

11. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The first lens group includes at least two positive lenses and at least two negative lenses.

12. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The second lens group includes at least two positive lenses and at least two negative lenses.

13. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, In the case where only the three lens groups are used as lens groups, the second lens group is a lens group with positive refractive power.

14. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The first lens group includes at least three negative lenses.

15. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The second lens group includes at least two positive lenses and at least three negative lenses.

16. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, When a lens component is set as a single lens or a combined lens... Of the lens element closest to the object and the second lens element from the object side, one lens element has negative refractive power, and the other lens element has positive refractive power. When focused on an object at infinity, the on-axis beam emitted from the image-side lens of the lens component with negative refractive power is divergent.

17. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, At least one of the lens closest to the object and the second lens from the object side is a negative lens with a concave lens surface on the object side.

18. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The imaging lens, from the side closest to the object, sequentially includes a single lens with negative refractive power, a single lens with positive refractive power, and a single lens with positive refractive power.

19. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The lens closest to the object has a concave surface on that side.

20. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, When the minimum refractive index of all positive lenses closer to the object side than the aperture is set to Ndfm relative to the d-line, The imaging lens satisfies the following condition (7). 1.46 < Ndfm < 1.72 (7).

21. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The aperture is configured within a lens group that is fixed relative to the image plane during focusing, or the aperture is configured between lens groups.

22. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The aperture is positioned between the first lens group and the second lens group. During focusing, the aperture is fixed relative to the image plane.

23. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The number of lenses positioned closer to the object than the aperture is eight or less.

24. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The number of lenses positioned closer to the object than the aperture is seven or less.

25. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The imaging lens comprises 13 or fewer lenses.

26. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The imaging lens comprises 12 or fewer lenses.

27. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The imaging lens includes at least two positive lenses on the image side, which is closer to the aperture than the aperture. When the average refractive index of all positive lenses closer to the image side than the aperture is set to Ndpr relative to the d-line, The imaging lens satisfies the following condition (8). 1.77 < Ndpr < 2.15 (8).

28. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The second lens group includes at least one positive lens. When the average refractive index of all positive lenses in the second lens group relative to the d-line is set to Nd2p, The imaging lens satisfies the following condition (9). 1.7 < Nd2p < 2.2 (9).

29. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The second lens group includes at least two joint lenses.

30. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The first lens group contains three positive lenses arranged consecutively.

31. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The first lens group contains four positive lenses arranged consecutively.

32. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, When the focal length of the second lens group is set to f2, When the focal length of the imaging lens is set to f while focusing on an object at infinity, The imaging lens satisfies the following condition (12). 0.3<|f2| / f<2.2 (12).

33. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, When the focal length of the first lens group is set to f1, When the focal length of the second lens group is set to f2... The imaging lens satisfies the following condition (13). 1 < f1 / f2 < 5 (13).

34. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The lateral magnification of the second lens group when focusing on an object at infinity is set to β2. When a lens is positioned on the image side of the second lens group and focused on an object at infinity, the combined lateral magnification of all lenses positioned on the image side of the second lens group is set to βr, and when no lens is positioned on the image side of the second lens group, βr is set to 1. The imaging lens satisfies the following condition (14). 0.3＜|（1-β22）×βr2|＜1.5 （14）。 35. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, Let Tf be the distance along the optical axis from the lens surface closest to the object to the aperture when the focus is on an object at infinity. When focusing on an object at infinity, the sum of the distance along the optical axis from the lens surface closest to the object to the lens surface closest to the image, and the back focal length measured in air distance, is set as TL. The imaging lens satisfies the following condition (15). 0.2<Tf / TL<0.65 (15).

36. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The first lens group, starting from the side closest to the object, sequentially includes a first unit with negative refractive power and a second unit with positive refractive power, separated from the first unit by the maximum air gap on the optical axis within the first lens group. The second unit includes a single lens or a combined lens. The focal length of the imaging lens when focusing on an object at infinity is set to f. When the combined focal length of all lenses on the image side of the imaging lens that are closer to the image than the second unit is set to fm, in a state where the lens is focused on an object at infinity, The imaging lens satisfies the following condition (16). 0.7 < f / fm < 0.98 (16).

37. The imaging lens according to claim 36, wherein, The first unit includes a negative lens. The second unit includes a positive lens.

38. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, When the partial dispersion ratio between the g-line and F-line of the LA positive lens is set to θgFA... The imaging lens satisfies the following condition (17). 0.01<θgFA+0.00162×νdA-0.64159<0.06 (17).

39. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, When the partial dispersion ratio between the g-line and F-line of the LB positive lens is set to θgFB... The imaging lens satisfies the following condition (18). 0.01<θgFB+0.00162×νdB-0.64159<0.05 (18).

40. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The first lens group includes at least two negative lenses. The average value of the d-line dispersion coefficients of two negative lenses selected from the negative lenses included in the first lens group in ascending order of their d-line dispersion coefficients is denoted as νdn1. When the average of the partial dispersion ratios between the g-line and F-line of two negative lenses selected from the negative lenses included in the first lens group in ascending order of their dispersion coefficients based on the d-line reference is set as θgFn1, The imaging lens satisfies the following condition (19). 0.01<θgFn1+0.00162×νdn1-0.64159<0.05 (19).

41. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The imaging lens satisfies the following condition (1-1). 1.88<NdA<2.15 (1-1).

42. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The imaging lens satisfies the following condition (1-2). 1.91<NdA<2.15 (1-2).

43. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The imaging lens satisfies the following condition (2-1). 13.5<νdA<31 (2-1).

44. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The imaging lens satisfies the following condition (2-2). 14<νdA<28 (2-2)。 45. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The imaging lens satisfies the following condition (2-3). 14.5<νdA<22 (2-3).

46. ​​The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The imaging lens satisfies the following condition (3-1). 62 < νdB < 92 (3-1).

47. The imaging lens according to any one of claims 1, 4, 8 to 10, wherein, The imaging lens satisfies the following condition (3-2). 66 < νdB < 88 (3-2).

48. The imaging lens according to claim 20, wherein, The imaging lens satisfies the following condition (7-1). 1.52<Ndfm<1.68 (7-1).

49. The imaging lens according to claim 27, wherein, The imaging lens satisfies the following condition (8-1). 1.81 < Ndpr < 2.1 (8-1).

50. The imaging lens according to claim 27, wherein, The imaging lens satisfies the following condition (8-2). 1.87<Ndpr<2.05 (8-2).

51. The imaging lens according to claim 28, wherein, The imaging lens satisfies the following condition (9-1). 1.77<Nd2p<2.15 (9-1).

52. The imaging lens according to claim 28, wherein, The imaging lens satisfies the following condition (9-2). 1.81 < Nd2p < 2.1 (9-2).

53. The imaging lens according to claim 28, wherein, The imaging lens satisfies the following condition (9-3). 1.87<Nd2p<2.05 (9-3).

54. The imaging lens according to any one of claims 4, 8 to 10, wherein, The imaging lens satisfies the following condition (11-2). 2.8<1 / {tan(ωmax)×FNo}<3.8 (11-2).

55. The imaging lens according to claim 32, wherein, The imaging lens satisfies the following condition (12-1). 0.4<|f2| / f<1.9 (12-1).

56. The imaging lens according to claim 32, wherein, The imaging lens satisfies the following condition (12-2). 0.45<|f2| / f<1.2 (12-2).

57. The imaging lens according to claim 32, wherein, The imaging lens satisfies the following condition (12-3). 0.5<|f2| / f<1 (12-3).

58. The imaging lens according to claim 33, wherein, The imaging lens satisfies the following condition (13-1). 1.2<f1 / f2<4.4 (13-1).

59. The imaging lens according to claim 33, wherein, The imaging lens satisfies the following condition (13-2). 2.3<f1 / f2<4.2 (13-2).

60. The imaging lens according to claim 33, wherein, The imaging lens satisfies the following condition (13-3). 2.5 < f1 / f2 < 4 (13-3).

61. The imaging lens according to claim 34, wherein, The imaging lens satisfies the following condition (14-1). 0.4＜|（1-β22）×βr2|＜1.4 （14-1）。 62. The imaging lens according to claim 34, wherein, The imaging lens satisfies the following condition (14-2). 0.6＜|（1-β22）×βr2|＜1 （14-2）。 63. The imaging lens according to claim 35, wherein, The imaging lens satisfies the following condition (15-1). 0.4<Tf / TL<0.64 (15-1).

64. The imaging lens according to claim 35, wherein, The imaging lens satisfies the following condition (15-2). 0.48<Tf / TL<0.61 (15-2).

65. The imaging lens according to claim 36, wherein, The imaging lens satisfies the following condition (16-1). 0.75<f / fm<0.95 (16-1).

66. The imaging lens according to claim 38, wherein, The imaging lens satisfies the following condition (17-1). 0.015<θgFA+0.00162×νdA-0.64159<0.055 (17-1).

67. The imaging lens according to claim 39, wherein, The imaging lens satisfies the following condition (18-1). 0.012<θgFB+0.00162×νdB-0.64159<0.035 (18-1).

68. The imaging lens according to claim 40, wherein, The imaging lens satisfies the following condition (19-1). 0.016<θgFn1+0.00162×νdn1-0.64159<0.042 (19-1).

69. A camera device comprising an imaging lens according to any one of claims 1 to 68.

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