Imaging lens group and imaging module

Abstract

The present invention relates to an imaging lens group, which sequentially includes, from the object side to the image side: a first lens with negative refractive power; a second lens with positive refractive power; an aperture; a third lens with positive refractive power; a fourth lens with positive refractive power; a fifth lens with negative refractive power; and an infrared band-pass filter. The total number of lenses with refractive power in the imaging lens group is five. The maximum viewing angle of the imaging lens group is FOV, the f-number of the imaging lens group is Fno, the distance from the object-side surface of the first lens to the imaging surface on the optical axis is TL, the distance from the image-side surface of the fifth lens to the imaging surface on the optical axis is BFL, the entrance pupil diameter of the imaging lens group is EPD, and the following conditions are satisfied: 0.58 < FOV / (Fno * 100) < 1.28 and 4.76 < (TL - BFL) / EPD < 12.03.

Description

Technical Field

[0001] The present invention relates to an imaging lens group and a camera module, and particularly to an imaging lens group and a camera module applied to electronic products. Background Art

[0002] Currently, photographic lenses with ultra-wide-angle characteristics have been applied to various electronic products, such as smart phones, tablet computers, game consoles, dash cams, monitors, and vehicle surround view systems.

[0003] Among them, the photographic lenses equipped with various electronic products will also develop different configuration requirements according to various application situations. For example, on the basis of ultra-wide angle, they also have the characteristics of large aperture. Currently, the photographic lenses of various electronic products are difficult to meet the requirements of simultaneously having ultra-wide angle and large aperture characteristics and providing a high relative illumination, especially for smart electronic products applied to 3D sensing technology. Summary of the Invention

[0004] The purpose of the present invention is to provide an imaging lens group and a camera module. The imaging lens group includes five lenses with refractive power. When specific conditions are met, the imaging lens group provided by the present invention can meet the requirements of ultra-wide angle and large aperture characteristics while maintaining high imaging quality.

[0005] An imaging lens group provided by the present invention sequentially includes, from the object side to the image side: a first lens with negative refractive power, the object-side surface of the first lens is convex near the optical axis, and the image-side surface of the first lens is concave near the optical axis; a second lens with positive refractive power, the object-side surface of the second lens is concave near the optical axis, and the image-side surface of the second lens is convex near the optical axis, and one of the object-side surface and the image-side surface of the second lens is an aspherical surface; an aperture; a third lens with positive refractive power, the object-side surface of the third lens is convex near the optical axis, and the image-side surface of the third lens is convex near the optical axis, and one of the object-side surface and the image-side surface of the third lens is an aspherical surface; a fourth lens with positive refractive power, the object-side surface of the fourth lens is concave near the optical axis, and the image-side surface of the fourth lens is convex near the optical axis, and one of the object-side surface and the image-side surface of the fourth lens is an aspherical surface; a fifth lens with negative refractive power, the object-side surface of the fifth lens is convex near the optical axis, and the image-side surface of the fifth lens is concave near the optical axis, and one of the object-side surface and the image-side surface of the fifth lens is an aspherical surface; and an infrared band-pass filter;

[0006] Among them, the total number of refractive lenses in the imaging lens group is five. The maximum viewing angle of the imaging lens group is FOV, the aperture value of the imaging lens group is Fno, the distance from the object-side surface of the first lens to the imaging surface on the optical axis is TL, the distance from the image-side surface of the fifth lens to the imaging surface on the optical axis is BFL, the entrance pupil diameter of the imaging lens group is EPD, and the following conditions are satisfied: 0.58 < FOV / (Fno * 100) < 1.28 and 4.76 < (TL - BFL) / EPD < 12.03.

[0007] The efficacy of the present invention lies in that: when the above five refractive lenses are combined with 0.58 < FOV / (Fno * 100) < 1.28, the aperture and viewing angle size of the imaging lens group reach the best quality. When the above five refractive lenses are combined with 4.76 < (TL - BFL) / EPD < 12.03, appropriate lens formability and back focal length can be maintained.

[0008] The overall focal length of the imaging lens group is f, and the focal length of the first lens is f1, and the following conditions are satisfied: -0.36 < f / f1 < -0.16. Thus, the ratio of the focal length of the first lens to the focal length of the imaging lens group can enhance its wide-angle characteristics to provide a larger viewing angle and maintain the illuminance of the system.

[0009] The overall focal length of the imaging lens group is f, and the focal length of the third lens is f3, and the following conditions are satisfied: 0.38 < f / f3 < 0.82. Thus, the ratio of the focal length of the third lens to the focal length of the imaging lens group can improve the image resolution of the imaging lens group.

[0010] The focal length of the fifth lens is f5, and the focal length of the first lens is f1, and the following conditions are satisfied: 0.5 < f5 / f1 < 2.82. Thus, the refractive power distribution of the imaging lens group is relatively appropriate, and aberration can be reduced.

[0011] The focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the focal length of the fifth lens is f5, and the following conditions are satisfied: -1.14 < f3 * f5 / (f2 * f4) < -0.09. Thus, the refractive power distribution of the imaging lens group is relatively appropriate, and the imaging quality of the imaging lens group can be improved.

[0012] The focal length of the third lens is f3, and the axial distance between the second lens and the third lens is T23, and the following conditions are satisfied: 1.54 < f3 * T23 < 7.9. Thus, the assembly sensitivity of the imaging lens group can be reduced.

[0013] The thickness of the fourth lens on the optical axis is CT4, and the displacement parallel to the optical axis from the intersection of the object-side surface of the fourth lens on the optical axis to the position of the maximum effective radius of the object-side surface of the fourth lens is TDP7, and the following conditions are satisfied: 0.61 < CT4 / TDP7 < 1.54. Thus, the performance and the assembly stability of the fourth lens reach the best at this time.

[0014] The distance from the image-side surface of the fifth lens to the imaging plane on the optical axis is BFL, and the thickness of the fifth lens on the optical axis is CT5, and the following conditions are satisfied: 1.02 < BFL / CT5 < 2.55. Thus, it helps to achieve an appropriate balance between the lens formability and the refractive power of the fifth lens.

[0015] The thickness of the second lens on the optical axis is CT2, and the thickness of the first lens on the optical axis is CT1, and the following conditions are satisfied: 1.12 < CT2 / CT1 < 2.5. Thus, the thickness combination of the first lens and the second lens of the imaging lens group is more appropriate, and the manufacturing and assembly tolerances can be reduced.

[0016] The thickness of the first lens on the optical axis is CT1, the thickness of the second lens on the optical axis is CT2, the thickness of the third lens on the optical axis is CT3, the thickness of the fourth lens on the optical axis is CT4, and the thickness of the fifth lens on the optical axis is CT5, and the following conditions are satisfied: 0.47 < (CT1 + CT2) / (CT3 + CT4 + CT5) < 1.51. Thus, the lens combination of the imaging lens group is more appropriate, which is beneficial to achieving a balance between miniaturization and performance.

[0017] The displacement parallel to the optical axis from the intersection of the image-side surface of the first lens on the optical axis to the position of the maximum effective radius of the image-side surface of the first lens is TDP2, and the entrance pupil diameter of the imaging lens group is EPD, and the following conditions are satisfied: 0.95 < TDP2 / EPD < 2.35. Thus, the large aperture target can be achieved and the formability of the first lens can be optimized.

[0018] The dispersion coefficient of the first lens is vd1, the dispersion coefficient of the second lens is vd2, and the refractive index of the first lens is nd1, and the following conditions are satisfied: 1.21 < (vd1 * nd1) / vd2 < 5.57. Thus, the material combination of the first lens and the second lens of the imaging lens group is more appropriate, and a larger viewing angle and appropriate illuminance can be provided.

[0019] The radius of curvature R2 of the image-side surface of the first lens, and the refractive index of the first lens is nd1, and the following conditions are satisfied: 0.88 < R2 / nd1 < 2.91. Thus, under different material selections of the first lens of the imaging lens group, the balance between the lens formability and the performance of the imaging lens group can reach the best.

[0020] The distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, and the maximum imaging height of the imaging lens group is IMH (IMH is usually half of the diagonal length of the effective pixel region of the image sensor, but depending on the usage characteristics of the electronic product, it can be less than or greater than half of the diagonal length of the effective pixel region of the image sensor), and the following conditions are satisfied: 3.68 < TL / IMH < 5.92. Thereby, it helps to achieve an appropriate balance between miniaturization and the effective pixel region.

[0021] The maximum viewing angle in the imaging lens group is FOV, and the following conditions are satisfied: 102.97 < FOV < 147.66, so that the imaging lens group has an ultra-wide angle characteristic.

[0022] An imaging module provided by the present invention further includes: a lens barrel; an imaging lens group disposed in the lens barrel; and an image sensor disposed on the imaging surface of the imaging lens group.

[0023] Wherein the imaging lens group, in order from the object side to the image side, includes: a first lens having a negative refractive power, the object side surface of the first lens is convex near the optical axis, and the image side surface of the first lens is concave near the optical axis; a second lens having a positive refractive power, the object side surface of the second lens is concave near the optical axis, and the image side surface of the second lens is convex near the optical axis, and one of the object side surface and the image side surface of the second lens is an aspherical surface; an aperture; a third lens having a positive refractive power, the object side surface of the third lens is convex near the optical axis, and the image side surface of the third lens is convex near the optical axis, and one of the object side surface and the image side surface of the third lens is an aspherical surface; a fourth lens having a positive refractive power, the object side surface of the fourth lens is concave near the optical axis, and the image side surface of the fourth lens is convex near the optical axis, and one of the object side surface and the image side surface of the fourth lens is an aspherical surface; a fifth lens having a negative refractive power, the object side surface of the fifth lens is convex near the optical axis, and the image side surface of the fifth lens is concave near the optical axis, and one of the object side surface and the image side surface of the fifth lens is an aspherical surface; and an infrared band-pass filter;

[0024] Wherein the total number of lenses with refractive power in the imaging lens group is five, the maximum viewing angle in the imaging lens group is FOV, the aperture value of the imaging lens group is Fno, the distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, the distance from the image side surface of the fifth lens to the imaging surface on the optical axis is BFL, the entrance pupil diameter of the imaging lens group is EPD, and the following conditions are satisfied: 0.58 < FOV / (Fno*100) < 1.28 and 4.76 < (TL - BFL) / EPD < 12.03.

[0025] The efficacy of the present invention lies in that when the above five refractive power lenses are combined with 0.58 < FOV / (Fno*100) < 1.28, the aperture and the viewing angle size of the imaging lens group reach the best quality. When the above five refractive power lenses are combined with 4.76 < (TL - BFL) / EPD < 12.03, the appropriate lens formability and back focal length can be maintained.

[0026] The overall focal length of the imaging lens group is f, and the focal length of the first lens is f1, and the following conditions are satisfied: -0.36 < f / f1 < -0.16. Thus, the ratio of the focal length of the first lens to the focal length of the imaging lens group can enhance its wide - angle characteristics, provide a larger viewing angle, and maintain the illuminance of the system.

[0027] The overall focal length of the imaging lens group is f, and the focal length of the third lens is f3, and the following conditions are satisfied: 0.38 < f / f3 < 0.82. Thus, the ratio of the focal length of the third lens to the focal length of the imaging lens group can improve the image resolution of the imaging lens group.

[0028] The focal length of the fifth lens is f5, and the focal length of the first lens is f1, and the following conditions are satisfied: 0.5 < f5 / f1 < 2.82. Thus, the refractive power distribution of the imaging lens group is more appropriate, and the aberration can be reduced.

[0029] The focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the focal length of the fifth lens is f5, and the following conditions are satisfied: -1.14 < f3*f5 / (f2*f4) < -0.09. Thus, the refractive power distribution of the imaging lens group is more appropriate, and the imaging quality of the imaging lens group can be improved.

[0030] The focal length of the third lens is f3, and the distance between the second lens and the third lens on the optical axis is T23, and the following conditions are satisfied: 1.54 < f3*T23 < 7.9. Thus, the assembly sensitivity of the imaging lens group can be reduced.

[0031] The thickness of the fourth lens on the optical axis is CT4, and the displacement amount parallel to the optical axis from the intersection point of the object - side surface of the fourth lens on the optical axis to the maximum effective radius position of the object - side surface of the fourth lens is TDP7, and the following conditions are satisfied: 0.61 < CT4 / TDP7 < 1.54. Thus, at this time, the performance and the assembly stability of the fourth lens reach the best.

[0032] The distance from the image - side surface of the fifth lens to the imaging surface on the optical axis is BFL, and the thickness of the fifth lens on the optical axis is CT5, and the following conditions are satisfied: 1.02 < BFL / CT5 < 2.55. Thus, it helps to achieve an appropriate balance between the lens formability and the refractive power of the fifth lens.

[0033] The thickness of the second lens on the optical axis is CT2, and the thickness of the first lens on the optical axis is CT1, and they satisfy the following condition: 1.12 < CT2 / CT1 < 2.5. Thus, the thickness combination of the first lens and the second lens of the imaging lens group is relatively appropriate, and manufacturing and assembly tolerances can be reduced.

[0034] The thickness of the first lens on the optical axis is CT1, the thickness of the second lens on the optical axis is CT2, the thickness of the third lens on the optical axis is CT3, the thickness of the fourth lens on the optical axis is CT4, and the thickness of the fifth lens on the optical axis is CT5, and they satisfy the following condition: 0.47 < (CT1 + CT2) / (CT3 + CT4 + CT5) < 1.51. Thus, the lens combination of the imaging lens group is relatively appropriate, which is beneficial to achieving a balance between miniaturization and performance.

[0035] The displacement of the intersection point of the image-side surface of the first lens on the optical axis to the position of the maximum effective radius parallel to the optical axis of the image-side surface of the first lens is TDP2, and the entrance pupil diameter of the imaging lens group is EPD, and they satisfy the following condition: 0.95 < TDP2 / EPD < 2.35. Thus, the large aperture target can be achieved and the formability of the first lens can be optimized.

[0036] The dispersion coefficient of the first lens is vd1, the dispersion coefficient of the second lens is vd2, and the refractive index of the first lens is nd1, and they satisfy the following condition: 1.21 < (vd1 * nd1) / vd2 < 5.57. Thus, the material combination of the first lens and the second lens of the imaging lens group is relatively appropriate, and a larger viewing angle and appropriate illuminance can be provided.

[0037] The radius of curvature R2 of the image-side surface of the first lens, and the refractive index of the first lens is nd1, and they satisfy the following condition: 0.88 < R2 / nd1 < 2.91. Thus, under different material selections of the first lens of the imaging lens group, the balance between lens formability and the performance of the imaging lens group can reach the best.

[0038] The distance from the object-side surface of the first lens to the imaging surface on the optical axis is TL, and the maximum imaging height of the imaging lens group is IMH (IMH is usually half of the diagonal length of the effective pixel area of the image sensor, but due to the use characteristics of electronic products, it can be less than or greater than half of the diagonal length of the effective pixel area of the image sensor), and they satisfy the following condition: 3.68 < TL / IMH < 5.92. Thus, it helps to achieve an appropriate balance between miniaturization and the effective pixel area.

[0039] The maximum viewing angle in the imaging lens group is FOV, and they satisfy the following condition: 102.97 < FOV < 147.66, so that the imaging lens group has an ultra-wide angle characteristic. Description of the Drawings

[0040] To more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0041] Figure 1A It is a schematic diagram of the imaging lens group according to the first embodiment of the present invention.

[0042] Figure 1B From left to right are the field curvature and distortion curves of the imaging lens group according to the first embodiment.

[0043] Figure 2A It is a schematic diagram of the imaging lens group according to the second embodiment of the present invention.

[0044] Figure 2B From left to right are the field curvature and distortion curves of the imaging lens group according to the second embodiment.

[0045] Figure 3A It is a schematic diagram of the imaging lens group according to the third embodiment of the present invention.

[0046] Figure 3B From left to right are the field curvature and distortion curves of the imaging lens group according to the third embodiment.

[0047] Figure 4A It is a schematic diagram of the imaging lens group according to the fourth embodiment of the present invention.

[0048] Figure 4B From left to right are the field curvature and distortion curves of the imaging lens group according to the fourth embodiment.

[0049] Figure 5A It is a schematic diagram of the imaging lens group according to the fifth embodiment of the present invention.

[0050] Figure 5B From left to right are the field curvature and distortion curves of the imaging lens group according to the fifth embodiment.

[0051] Figure 6A It is a schematic diagram of the imaging lens group according to the sixth embodiment of the present invention.

[0052] Figure 6B From left to right are the field curvature and distortion curves of the imaging lens group according to the sixth embodiment.

[0053] Figure 7 It is a schematic diagram of the imaging module according to the seventh embodiment of the present invention.

[0054] Figure 8 It is a schematic diagram of the first lens and parameter TDP2 in the first embodiment of the present invention.

[0055] Figure 9 It is a schematic diagram of the fourth lens and the parameter TDP7 in the first embodiment of the present invention.

[0056] Symbol description

[0057] 100, 200, 300, 400, 500, 600: Aperture

[0058] 110, 210, 310, 410, 510, 610: First lens

[0059] 111, 211, 311, 411, 511, 611: Object-side surface

[0060] 112, 212, 312, 412, 512, 612: Image-side surface

[0061] 120, 220, 320, 420, 520, 620: Second lens

[0062] 121, 221, 321, 421, 521, 621: Object-side surface

[0063] 122, 222, 322, 422, 522, 622: Image-side surface

[0064] 130, 230, 330, 430, 530, 630: Third lens

[0065] 131, 231, 331, 431, 531, 631: Object-side surface

[0066] 132, 232, 332, 432, 532, 632: Image-side surface

[0067] 140, 240, 340, 440, 540, 640: Fourth lens

[0068] 141, 241, 341, 441, 541, 641: Object-side surface

[0069] 142, 242, 342, 442, 542, 642: Image-side surface

[0070] 150, 250, 350, 450, 550, 650: Fifth lens

[0071] 151, 251, 351, 451, 551, 651: Object-side surface

[0072] 152, 252, 352, 452, 552, 652: Image-side surface

[0073] 160, 260, 360, 460, 560, 660: Infrared band - pass filter

[0074] 170, 270, 370, 470, 570, 670: Imaging surface

[0075] 180, 280, 380, 480, 580, 680: Image sensor

[0076] 190, 290, 390, 490, 590, 690: Optical axis

[0077] 10: Camera module

[0078] 11: Lens barrel

[0079] 12: Imaging lens group

[0080] BFL: Distance from the image - side surface of the fifth lens to the imaging surface on the optical axis

[0081] IMH: Maximum imaging height of the imaging lens group

[0082] TL: Distance from the object - side surface of the first lens to the imaging surface on the optical axis

[0083] TDP2: Displacement parallel to the optical axis from the intersection point of the image - side surface of the first lens on the optical axis to the position of the maximum effective radius of the image - side surface of the first lens

[0084] TDP7: Displacement parallel to the optical axis from the intersection point of the object - side surface of the fourth lens on the optical axis to the position of the maximum effective radius of the object - side surface of the fourth lens Detailed implementation mode

[0085] The first embodiment

[0086] Please refer to Figure 1A and Figure 1B , wherein Figure 1A is a schematic diagram depicting an imaging lens group according to the first embodiment of the present invention, Figure 1B is the field curvature and distortion curve graph of the imaging lens group of the first embodiment from left to right. As can be seen from Figure 1A , the imaging lens group sequentially includes a first lens 110, a second lens 120, an aperture 100, a third lens 130, a fourth lens 140, a fifth lens 150, an infrared band - pass filter 160, and an imaging surface 170 along the optical axis 190 from the object side to the image side, and the imaging lens group is used in conjunction with an image sensor 180. Among them, the number of refractive lenses in the imaging lens group is five, but this is not a limitation. The image sensor 180 is disposed on the imaging surface 170.

[0087] The first lens 110 has a negative refractive power and is made of glass. Its object-side surface 111 is convex near the optical axis 190, and its image-side surface 112 is concave near the optical axis 190.

[0088] The second lens 120 has a positive refractive power and is made of plastic. Its object-side surface 121 is concave near the optical axis 190, its image-side surface 122 is convex near the optical axis 190, and both the object-side surface 121 and the image-side surface 122 are aspherical surfaces.

[0089] The third lens 130 has a positive refractive power and is made of plastic. Its object-side surface 131 is convex near the optical axis 190, its image-side surface 132 is convex near the optical axis 190, and both the object-side surface 131 and the image-side surface 132 are aspherical surfaces.

[0090] The fourth lens 140 has a positive refractive power and is made of plastic. Its object-side surface 141 is concave near the optical axis 190, its image-side surface 142 is convex near the optical axis 190, and both the object-side surface 141 and the image-side surface 142 are aspherical surfaces.

[0091] The fifth lens 150 has a negative refractive power and is made of plastic. Its object-side surface 151 is convex near the optical axis 190, its image-side surface 152 is concave near the optical axis 190, and both the object-side surface 151 and the image-side surface 152 are aspherical surfaces.

[0092] The infrared bandpass filter 160 is made of glass. It is disposed between the fifth lens 150 and the imaging surface 170 and does not affect the focal length of the imaging lens group. In this embodiment, a filter with a light transmission band of 940 ± 30 nm is selected, but this is not limiting.

[0093] The equations of the aspherical curves of the above lenses are expressed as follows:

[0094]

[0095] Where z is the position value with respect to the vertex of the surface at a position with a height of h along the optical axis 190 direction; c is the curvature of the lens surface near the optical axis 190 and is the reciprocal of the radius of curvature (R) (c = 1 / R), R is the radius of curvature of the lens surface near the optical axis 190, h is the perpendicular distance of the lens surface from the optical axis 190, k is the conic constant, and Ai is the i-th order aspherical coefficient.

[0096] In the imaging lens group of the first embodiment, the focal length of the imaging lens group is f, the entrance pupil diameter of the imaging lens group is EPD, the f-number of the imaging lens group is Fno, the maximum viewing angle of the imaging lens group is FOV, and the maximum imaging height of the imaging lens group is IMH. The numerical values are as follows: f = 1.42 (mm); EPD = 1.13 (mm); Fno = 1.26; FOV = 134.2 (degrees); and IMH = 2.10 (mm).

[0097] In the imaging lens group of the first embodiment, the maximum viewing angle of the imaging lens group is FOV, the f-number of the imaging lens group is Fno, the distance from the object-side surface 111 of the first lens 110 to the imaging surface 170 on the optical axis 190 is TL, the distance from the image-side surface 152 of the fifth lens 150 to the imaging surface 170 on the optical axis 190 is BFL, the entrance pupil diameter of the imaging lens group is EPD, and the following conditions are satisfied: FOV / (Fno * 100) = 1.07 and (TL - BFL) / EPD = 8.00.

[0098] In the imaging lens group of the first embodiment, the overall focal length of the imaging lens group is f, and the focal length of the first lens 110 is f1, and the following condition is satisfied: f / f1 = -0.26.

[0099] In the imaging lens group of the first embodiment, the overall focal length of the imaging lens group is f, and the focal length of the third lens 130 is f3, and the following condition is satisfied: f / f3 = 0.48.

[0100] In the imaging lens group of the first embodiment, the focal length of the fifth lens 150 is f5, and the focal length of the first lens 110 is f1, and the following condition is satisfied: f5 / f1 = 2.02.

[0101] In the imaging lens group of the first embodiment, the focal length of the second lens 120 is f2, the focal length of the third lens 130 is f3, the focal length of the fourth lens 140 is f4, and the focal length of the fifth lens 150 is f5, and the following condition is satisfied: f3 * f5 / (f2 * f4) = -0.95.

[0102] In the imaging lens group of the first embodiment, the focal length of the third lens 130 is f3, and the distance between the second lens 120 and the third lens 130 on the optical axis 190 is T23, and the following condition is satisfied: f3 * T23 = 6.58.

[0103] In the imaging lens group of the first embodiment, the thickness of the fourth lens 140 on the optical axis 190 is CT4, refer to Figure 9As shown, the displacement amount parallel to the optical axis 190 from the intersection point of the object-side surface 141 of the fourth lens 140 on the optical axis 190 to the maximum effective radius position of the object-side surface 141 of the fourth lens 140 is TDP7, and the following condition is satisfied: CT4 / TDP7 = 0.81.

[0104] In the imaging lens group of the first embodiment, the distance on the optical axis 190 from the image-side surface 152 of the fifth lens 150 to the imaging surface 170 is BFL, and the thickness of the fifth lens 150 on the optical axis 190 is CT5, and the following condition is satisfied: BFL / CT5 = 2.12.

[0105] In the imaging lens group of the first embodiment, the thickness of the second lens 120 on the optical axis 190 is CT2, and the thickness of the first lens 110 on the optical axis 190 is CT1, and the following condition is satisfied: CT2 / CT1 = 2.09.

[0106] In the imaging lens group of the first embodiment, the thickness of the first lens 110 on the optical axis 190 is CT1, the thickness of the second lens 120 on the optical axis 190 is CT2, the thickness of the third lens 130 on the optical axis 190 is CT3, the thickness of the fourth lens 140 on the optical axis 190 is CT4, and the thickness of the fifth lens 150 on the optical axis 190 is CT5, and the following condition is satisfied: (CT1 + CT2) / (CT3 + CT4 + CT5) = 1.26.

[0107] In the imaging lens group of the first embodiment, refer to Figure 8 As shown, the displacement amount parallel to the optical axis 190 from the intersection point of the image-side surface 112 of the first lens 110 on the optical axis 190 to the maximum effective radius position of the image-side surface 112 of the first lens 110 is TDP2, and the entrance pupil diameter of the imaging lens group is EPD, and the following condition is satisfied: TDP2 / EPD = 1.54.

[0108] In the imaging lens group of the first embodiment, the dispersion coefficient of the first lens 110 is vd1, the dispersion coefficient of the second lens 120 is vd2, and the refractive index of the first lens 110 is nd1, and the following condition is satisfied: (vd1 * nd1) / vd2 = 3.92.

[0109] In the imaging lens group of the first embodiment, the radius of curvature R2 of the image-side surface 112 of the first lens 110 and the refractive index of the first lens 110 is nd1, and the following condition is satisfied: R2 / nd1 = 2.22.

[0110] In the imaging lens group of the first embodiment, the distance from the object-side surface 111 of the first lens 110 to the imaging surface 170 on the optical axis 190 is TL, and the maximum imaging height of the imaging lens group is IMH, and the following condition is satisfied: TL / IMH = 4.72. The maximum imaging height IMH of the imaging lens group may be half of the diagonal length of the effective pixel region of the image sensor, but is not limited thereto.

[0111] Refer to Table 1 and Table 2 below for further reference.

[0112]

[0113]

[0114]

[0115] Table 1 is Figure 1A The detailed structural data of the first embodiment, where the unit of the radius of curvature, thickness, air gap, and focal length is mm, and the surfaces 0-14 represent the surfaces from the object side to the image side in sequence. Among them, surface 0 is the air gap on the optical axis 190 between the object and the object-side surface 111 of the first lens 110; surfaces 1, 3, 6, 8, 10, 12 are the thicknesses of the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, and the infrared band-pass filter 160 on the optical axis 190 respectively; surface 2 is the air gap on the optical axis 190 between the first lens 110 and the second lens 120, surface 4 is the air gap on the optical axis 190 between the second lens 120 and the aperture 100, surface 5 is the air gap on the optical axis 190 between the aperture 100 and the object-side surface 131 of the third lens 130, and since the aperture 100 is farther from the object side than the object-side surface 131 of the third lens 130, it is represented by a negative value; surface 7 is the air gap on the optical axis 190 between the third lens 130 and the object-side surface 141 of the fourth lens 140; surface 9 is the air gap on the optical axis 190 between the fourth lens 140 and the fifth lens 150, surface 11 is the air gap on the optical axis 190 between the fifth lens 150 and the infrared band-pass filter 160, and surface 13 is the air gap on the optical axis 190 between the infrared band-pass filter 160 and the imaging surface 170.

[0116] Table 2 is the aspherical data in the first embodiment. Among them, k is the conic coefficient in the aspherical curve equation, and A2, A4, A6, A8, A10, A12, A14, A16, A18, A20 are the higher-order aspherical coefficients. In addition, the tables of the following embodiments correspond to the schematic diagrams and the field curvature curves of the respective embodiments, and the definitions of the data in the tables are the same as those in Table 1 and Table 2 of the first embodiment, and will not be elaborated here.

[0117] In each embodiment, the maximum effective radius of any surface of the lens is generally the vertical distance between the intersection point of the outermost light ray of the maximum viewing angle incident light of the imaging lens group passing through the outermost edge of the entrance pupil and the optical axis on the lens surface, or the radius of the part of the lens surface without surface treatment (such as the lens surface having uneven structures or being inked, etc.), or the radius of the part through which light can pass through the lens (light shields or spacer rings, etc. can block light from passing through the lens), but it is not limited thereto.

[0118] Second Embodiment

[0119] Please refer to Figure 2A and Figure 2B where Figure 2A FIG. is a schematic diagram depicting an imaging lens group according to the second embodiment of the present invention, Figure 2B sequentially from left to right are the field curvature and distortion curves of the imaging lens group of the second embodiment. As can be seen from Figure 2A it, the imaging lens group sequentially includes a first lens 210, a second lens 220, an aperture 200, a third lens 230, a fourth lens 240, a fifth lens 250, an infrared band-pass filter 260, and an imaging surface 270 along the optical axis 290 from the object side to the image side, and the imaging lens group is used in conjunction with an image sensor 280. Among them, there are five refractive lenses in the imaging lens group, but it is not limited thereto. The image sensor 280 is disposed on the imaging surface 270.

[0120] The first lens 210 has a negative refractive power and is made of plastic. Its object-side surface 211 near the optical axis 290 is convex, and its image-side surface 212 near the optical axis 290 is concave, and both the object-side surface 221 and the image-side surface 222 are aspherical surfaces.

[0121] The second lens 220 has a positive refractive power and is made of plastic. Its object-side surface 221 near the optical axis 290 is concave, and its image-side surface 222 near the optical axis 290 is convex, and both the object-side surface 221 and the image-side surface 222 are aspherical surfaces.

[0122] The third lens 230 has a positive refractive power and is made of plastic. Its object-side surface 231 near the optical axis 290 is convex, and its image-side surface 232 near the optical axis 290 is convex, and both the object-side surface 231 and the image-side surface 232 are aspherical surfaces.

[0123] The fourth lens 240 has a positive refractive power and is made of plastic. Its object-side surface 241 near the optical axis 290 is concave, and its image-side surface 242 near the optical axis 290 is convex, and both the object-side surface 241 and the image-side surface 242 are aspherical surfaces.

[0124] The fifth lens 250 has a negative refractive power and is made of plastic. Its object-side surface 251 is convex near the optical axis 290, and its image-side surface 252 is concave near the optical axis 290. Both the object-side surface 251 and the image-side surface 252 are aspherical surfaces.

[0125] The infrared bandpass filter 260 is made of glass. It is disposed between the fifth lens 250 and the imaging surface 270 and does not affect the focal length of the imaging lens group. In this embodiment, a filter with a light passing wavelength band of 940 ± 30 nm is selected, but it is not limited thereto.

[0126] Refer to Table 3 and Table 4 below for reference.

[0127]

[0128]

[0129]

[0130]

[0131] In the second embodiment, the curve equation of the aspherical surface is expressed in the same form as that of the first embodiment. In addition, the definitions of the following table parameters are the same as those of the first embodiment and will not be elaborated herein.

[0132] The following data can be deduced by referring to Table 3 and Table 4:

[0133]

[0134] Third Embodiment

[0135] Please refer to Figure 3A and Figure 3B , where Figure 3A FIG. is a schematic diagram depicting an imaging lens group according to the third embodiment of the present invention. Figure 3B From left to right are the field curvature and distortion curves of the imaging lens group of the third embodiment. As can be seen from Figure 3A , the imaging lens group sequentially includes a first lens 310, a second lens 320, an aperture 300, a third lens 330, a fourth lens 340, a fifth lens 350, an infrared bandpass filter 360, and an imaging surface 370 along the optical axis 390 from the object side to the image side. The imaging lens group is used in conjunction with an image sensor 380. Among them, there are five lenses with refractive power in the imaging lens group, but it is not limited thereto. The image sensor 380 is disposed on the imaging surface 370.

[0136] The first lens 310 has a negative refractive power and is made of plastic. Its object-side surface 311 is convex near the optical axis 390, and its image-side surface 312 is concave near the optical axis 390. Both the object-side surface 321 and the image-side surface 322 are aspherical surfaces.

[0137] The second lens 320 has a positive refractive power and is made of plastic. Its object-side surface 321 is concave near the optical axis 390, and its image-side surface 322 is convex near the optical axis 390. Both the object-side surface 321 and the image-side surface 322 are aspherical surfaces.

[0138] The third lens 330 has a positive refractive power and is made of plastic. Its object-side surface 331 is convex near the optical axis 390, and its image-side surface 332 is convex near the optical axis 390. Both the object-side surface 331 and the image-side surface 332 are aspherical surfaces.

[0139] The fourth lens 340 has a positive refractive power and is made of plastic. Its object-side surface 341 is concave near the optical axis 390, and its image-side surface 342 is convex near the optical axis 390. Both the object-side surface 341 and the image-side surface 342 are aspherical surfaces.

[0140] The fifth lens 350 has a negative refractive power and is made of plastic. Its object-side surface 351 is convex near the optical axis 390, and its image-side surface 352 is concave near the optical axis 390. Both the object-side surface 351 and the image-side surface 352 are aspherical surfaces.

[0141] The infrared bandpass filter 360 is made of glass. It is disposed between the fifth lens 350 and the imaging surface 370 and does not affect the focal length of the imaging lens group. In this embodiment, a filter with a light passing wavelength band of 940 ± 30 nm is selected, but it is not limited thereto.

[0142] Refer to Table 5 and Table 6 below for further reference.

[0143]

[0144]

[0145]

[0146] In the third embodiment, the curve equation of the aspherical surface is expressed in the same form as that in the first embodiment. In addition, the definitions of the following table parameters are the same as those in the first embodiment and will not be elaborated herein.

[0147] Based on Table 5 and Table 6, the following data can be calculated:

[0148]

[0149] Fourth Embodiment

[0150] Please refer to Figure 4A and Figure 4B , wherein Figure 4A is a schematic diagram depicting an imaging lens group according to the fourth embodiment of the present invention, Figure 4B which are, from left to right in sequence, the field curvature and distortion curves of the imaging lens group of the fourth embodiment. As can be seen from Figure 4A , the imaging lens group sequentially includes a first lens 410, a second lens 420, an aperture 400, a third lens 430, a fourth lens 440, a fifth lens 450, an infrared bandpass filter 460, and an imaging surface 470 along the optical axis 490 from the object side to the image side, and the imaging lens group is used in conjunction with an image sensor 480. Among them, the refractive lenses in the imaging lens group are five in number, but this is not a limitation. The image sensor 480 is disposed on the imaging surface 470.

[0151] The first lens 410 has a negative refractive power and is made of glass. Its object-side surface 411 is convex near the optical axis 490, and its image-side surface 412 is concave near the optical axis 490.

[0152] The second lens 420 has a positive refractive power and is made of plastic. Its object-side surface 421 is concave near the optical axis 490, and its image-side surface 422 is convex near the optical axis 490, and both the object-side surface 421 and the image-side surface 422 are aspherical surfaces.

[0153] The third lens 430 has a positive refractive power and is made of plastic. Its object-side surface 431 is convex near the optical axis 490, and its image-side surface 432 is convex near the optical axis 490, and both the object-side surface 431 and the image-side surface 432 are aspherical surfaces.

[0154] The fourth lens 440 has a positive refractive power and is made of plastic. Its object-side surface 441 is concave near the optical axis 490, and its image-side surface 442 is convex near the optical axis 490, and both the object-side surface 441 and the image-side surface 442 are aspherical surfaces.

[0155] The fifth lens 450 has a negative refractive power and is made of plastic. Its object-side surface 451 is convex near the optical axis 490, and its image-side surface 452 is concave near the optical axis 490, and both the object-side surface 451 and the image-side surface 452 are aspherical surfaces.

[0156] The infrared bandpass filter 460 is made of glass and is disposed between the fifth lens 450 and the imaging surface 470 without affecting the focal length of the imaging lens group. In this embodiment, a filter with a light transmission band of 940 ± 30 nm is selected, but this is not a limitation.

[0157] Refer to Table 7 and Table 8 below for further reference.

[0158]

[0159]

[0160]

[0161] In the fourth embodiment, the aspheric curve equation is expressed in the same form as in the first embodiment. In addition, the definitions of the following table parameters are the same as those in the first embodiment and will not be elaborated here.

[0162] The following data can be deduced by referring to Table 7 and Table 8:

[0163]

[0164]

[0165] Fifth Embodiment

[0166] Please refer to Figure 5A and Figure 5B , where Figure 5A is a schematic diagram depicting an imaging lens group according to the fifth embodiment of the present invention. Figure 5B From left to right are the field curvature and distortion curves of the imaging lens group of the fifth embodiment. As can be seen from Figure 5A , the imaging lens group sequentially includes a first lens 510, a second lens 520, an aperture 500, a third lens 530, a fourth lens 540, a fifth lens 550, an infrared band-pass filter 560, and an imaging surface 570 along the optical axis 590 from the object side to the image side, and the imaging lens group is used in conjunction with an image sensor 580. Among them, there are five refractive lenses in the imaging lens group, but this is not a limitation. The image sensor 580 is disposed on the imaging surface 570.

[0167] The first lens 510 has a negative refractive power and is made of glass. Its object-side surface 511 is convex near the optical axis 590, and its image-side surface 512 is concave near the optical axis 590.

[0168] The second lens 520 has a positive refractive power and is made of plastic. Its object-side surface 521 is concave near the optical axis 590, and its image-side surface 522 is convex near the optical axis 590, and both the object-side surface 521 and the image-side surface 522 are aspherical surfaces.

[0169] The third lens 530 has a positive refractive power and is made of plastic. Its object-side surface 531 is convex near the optical axis 590, and its image-side surface 532 is convex near the optical axis 590, and both the object-side surface 531 and the image-side surface 532 are aspherical surfaces.

[0170] The fourth lens 540 has a positive refractive power and is made of plastic. Its object-side surface 541 is concave near the optical axis 590, and its image-side surface 542 is convex near the optical axis 590. Both the object-side surface 541 and the image-side surface 542 are aspherical surfaces.

[0171] The fifth lens 550 has a negative refractive power and is made of plastic. Its object-side surface 551 is convex near the optical axis 590, and its image-side surface 552 is concave near the optical axis 590. Both the object-side surface 551 and the image-side surface 552 are aspherical surfaces.

[0172] The infrared band-pass filter 560 is made of glass. It is disposed between the fifth lens 550 and the imaging surface 570 and does not affect the focal length of the imaging lens group. In this embodiment, a filter that can pass light in the wavelength band of 940 ± 30 nm is selected, but it is not limited thereto.

[0173] Refer to Table 9 and Table 10 below for further reference.

[0174]

[0175]

[0176]

[0177]

[0178] In the fifth embodiment, the equation of the aspherical curve is expressed in the same form as that in the first embodiment. In addition, the definitions of the following table parameters are the same as those in the first embodiment and will not be elaborated herein.

[0179] The following data can be deduced by referring to Table 9 and Table 10:

[0180]

[0181] Sixth Embodiment

[0182] Please refer to Figure 6A and Figure 6B where Figure 6A is a schematic diagram depicting an imaging lens group according to the sixth embodiment of the present invention, Figure 6B and the field curvature and distortion curves of the imaging lens group of the sixth embodiment are shown in sequence from left to right. From Figure 6AIt can be known that the imaging lens group sequentially includes a first lens 610, a second lens 620, an aperture 600, a third lens 630, a fourth lens 640, a fifth lens 650, an infrared band-pass filter 660, and an imaging surface 670 along the optical axis 690 from the object side to the image side, and the imaging lens group is used in cooperation with an image sensor 680. Among them, there are five lenses with refractive power in the imaging lens group, but this is not a limitation. The image sensor 680 is disposed on the imaging surface 670.

[0183] The first lens 610 has a negative refractive power and is made of plastic. Its object-side surface 611 is convex near the optical axis 690, and its image-side surface 612 is concave near the optical axis 690, and both the object-side surface 611 and the image-side surface 612 are aspherical surfaces.

[0184] The second lens 620 has a positive refractive power and is made of plastic. Its object-side surface 621 is concave near the optical axis 690, and its image-side surface 622 is convex near the optical axis 690, and both the object-side surface 621 and the image-side surface 622 are aspherical surfaces.

[0185] The third lens 630 has a positive refractive power and is made of plastic. Its object-side surface 631 is convex near the optical axis 690, and its image-side surface 632 is convex near the optical axis 690, and both the object-side surface 631 and the image-side surface 632 are aspherical surfaces.

[0186] The fourth lens 640 has a positive refractive power and is made of plastic. Its object-side surface 641 is concave near the optical axis 690, and its image-side surface 642 is convex near the optical axis 690, and both the object-side surface 641 and the image-side surface 642 are aspherical surfaces.

[0187] The fifth lens 650 has a negative refractive power and is made of plastic. Its object-side surface 651 is convex near the optical axis 690, and its image-side surface 652 is concave near the optical axis 690, and both the object-side surface 651 and the image-side surface 652 are aspherical surfaces.

[0188] The infrared band-pass filter 660 is made of glass. It is disposed between the fifth lens 650 and the imaging surface 670 and does not affect the focal length of the imaging lens group. In this embodiment, a filter with a light passing wavelength band of 940 ± 30 nm is selected, but this is not a limitation.

[0189] Then, refer to Table 11 and Table 12 below for further reference.

[0190]

[0191]

[0192]

[0193] In the sixth embodiment, the curve equation of the aspherical surface is expressed in the same form as that in the first embodiment. In addition, the definitions of the following table parameters are the same as those in the first embodiment and will not be elaborated here.

[0194] Based on Table 11 and Table 12, the following data can be deduced:

[0195]

[0196] Seventh Embodiment

[0197] Please refer to Figure 7 , and depict the imaging module according to the third embodiment of the present invention. In this embodiment, the imaging module is applied to a notebook computer, but is not limited thereto. The imaging module 10 further includes a lens barrel 11, an imaging lens group 12, and an image sensor 380. The imaging lens group 12 is the imaging lens group of the above-mentioned third embodiment, but is not limited thereto. The imaging lens group of other above-mentioned embodiments may also be used. In addition, Figure 7 the peripheral portions of the lenses of the drawn imaging lens group that do not take light are shown, and are slightly different from the lenses of the third embodiment. The imaging lens group 12 is disposed in the lens barrel 11; the image sensor 380 is disposed on the imaging surface 370 of the imaging lens group 12 and is an electronic photosensitive component with good sensitivity and low noise (such as CMOS, CCD) to truly present the imaging quality of the imaging lens group.

[0198] For the imaging lens group provided by the present invention, the material of the lens can be plastic or glass. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the degree of freedom of the refractive power configuration of the imaging lens group can be increased. In addition, the object-side surface and the image-side surface of the lens in the imaging lens group can be aspherical surfaces. The aspherical surface can be easily made into a shape other than a spherical surface, obtaining more control variables to reduce aberration, and thus reducing the number of lenses used. Therefore, the total length of the imaging lens group of the present invention can be effectively reduced.

[0199] In the imaging lens group provided by the present invention, for a lens having refractive power, if the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex near the optical axis; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave near the optical axis.

[0200] The imaging lens group provided by the present invention can also be applied to an optical system with moving focus according to requirements, and has the characteristics of excellent aberration correction and good imaging quality. It can be widely applied to electronic imaging systems such as 3D (three-dimensional) image capture, digital cameras, mobile devices, digital drawing tablets, or vehicle-mounted photography.

[0201] In summary, the above embodiments and drawings are only preferred embodiments of the present invention, and should not be used to limit the scope of the present invention. That is, all equivalent changes and modifications made in accordance with the scope of the patent application of the present invention should fall within the scope covered by the patent of the present invention.

Claims

1. An imaging lens group, characterized in that, In order from the object side to the image side, it includes: A first lens with negative refractive power. The object-side surface of the first lens is convex near the optical axis, and the image-side surface of the first lens is concave near the optical axis. A second lens with positive refractive power. The object-side surface of the second lens is concave near the optical axis, and the image-side surface of the second lens is convex near the optical axis. One of the object-side surface and the image-side surface of the second lens is aspherical. An aperture. A third lens with positive refractive power. The object-side surface of the third lens is convex near the optical axis, and the image-side surface of the third lens is convex near the optical axis. One of the object-side surface and the image-side surface of the third lens is aspherical. A fourth lens with positive refractive power. The object-side surface of the fourth lens is concave near the optical axis, and the image-side surface of the fourth lens is convex near the optical axis. One of the object-side surface and the image-side surface of the fourth lens is aspherical. A fifth lens with negative refractive power. The object-side surface of the fifth lens is convex near the optical axis, and the image-side surface of the fifth lens is concave near the optical axis. One of the object-side surface and the image-side surface of the fifth lens is aspherical; and An infrared band-pass filter; Among them, the total number of refractive lenses in the imaging lens group is five. The maximum viewing angle of the imaging lens group is FOV, the aperture value of the imaging lens group is Fno, the distance from the object-side surface of the first lens to the imaging surface on the optical axis is TL, the distance from the image-side surface of the fifth lens to the imaging surface on the optical axis is BFL, the entrance pupil diameter of the imaging lens group is EPD, and the following conditions are satisfied: 0.58 < FOV / (Fno * 100) < 1.28 and 4.76 < (TL - BFL) / EPD < 12.

03.

2. The imaging lens group according to claim 1, wherein: The overall focal length of the imaging lens group is f, and the focal length of the first lens is f1, and the following conditions are satisfied: -0.36 < f / f1 < -0.

16.

3. The imaging lens group according to claim 1, characterized in that: The overall focal length of the imaging lens group is f, and the focal length of the third lens is f3, and the following conditions are satisfied: 0.38 < f / f3 < 0.

82.

4. The imaging lens group according to claim 1, wherein: The focal length of the fifth lens is f5, and the focal length of the first lens is f1, and the following conditions are satisfied: 0.5 < f5 / f1 < 2.

82.

5. The imaging lens group according to claim 1, wherein: The focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the focal length of the fifth lens is f5, and the following conditions are satisfied: -1.14 < f3 * f5 / (f2 * f4) < -0.

09.

6. The imaging lens group according to claim 1, wherein: The focal length of the third lens is f3, and the distance between the second lens and the third lens on the optical axis is T23, and the following conditions are satisfied: 1.54 < f3 * T23 < 7.

9.

7. The imaging lens group according to claim 1, wherein: The thickness of the fourth lens on the optical axis is CT4, and the displacement of the intersection point of the object-side surface of the fourth lens on the optical axis to the position of the maximum effective radius of the object-side surface of the fourth lens parallel to the optical axis is TDP7, and the following conditions are satisfied: 0.61 < CT4 / TDP7 < 1.

54.

8. The imaging lens group according to claim 1, wherein: The distance from the image-side surface of the fifth lens to the imaging surface on the optical axis is BFL, and the thickness of the fifth lens on the optical axis is CT5, and the following conditions are satisfied: 1.02 < BFL / CT5 < 2.

55.

9. The imaging lens group according to claim 1, characterized in that: The thickness of the second lens on the optical axis is CT2, and the thickness of the first lens on the optical axis is CT1, and they satisfy the following condition: 1.12 < CT2 / CT1 < 2.

5.

10. The imaging lens group according to claim 1, wherein: The thickness of the first lens on the optical axis is CT1, the thickness of the second lens on the optical axis is CT2, the thickness of the third lens on the optical axis is CT3, the thickness of the fourth lens on the optical axis is CT4, and the thickness of the fifth lens on the optical axis is CT5, and they satisfy the following condition: 0.47 < (CT1 + CT2) / (CT3 + CT4 + CT5) < 1.

51.

11. The imaging lens group according to claim 1, characterized in that: The displacement amount parallel to the optical axis from the intersection point of the image side surface of the first lens on the optical axis to the position of the maximum effective radius of the image side surface of the first lens is TDP2, and the entrance pupil diameter of the imaging lens group is EPD, and they satisfy the following condition: 0.95 < TDP2 / EPD < 2.

35.

12. The imaging lens group according to claim 1, characterized in that: The dispersion coefficient of the first lens is vd1, the dispersion coefficient of the second lens is vd2, and the refractive index of the first lens is nd1, and they satisfy the following condition: 1.21 < (vd1 * nd1) / vd2 < 5.

57.

13. The imaging lens group according to claim 1, wherein: The radius of curvature R2 of the image side surface of the first lens, and the refractive index of the first lens is nd1, and they satisfy the following condition: 0.88 < R2 / nd1 < 2.

91.

14. The imaging lens group according to claim 1, wherein: The distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, and the maximum imaging height of the imaging lens group is IMH, and they satisfy the following condition: 3.68 < TL / IMH < 5.

92.

15. An imaging module, characterized in that, Comprising: A lens barrel; The imaging lens group according to any one of claims 1 to 14, disposed in the lens barrel; and An image sensor, disposed on the imaging surface of the imaging lens group.

Images