Camera module

Abstract

The present invention provides a camera module, comprising: a lens barrel; an imaging lens group disposed in the lens barrel; and an image sensor disposed on an imaging surface of the imaging lens group; the imaging lens group comprising, from the object side to the image side, a first lens having negative refractive power; a second lens having negative refractive power; a third lens having positive refractive power; an aperture; a fourth lens having positive refractive power; a fifth lens having negative refractive power; a sixth lens having positive refractive power; and a seventh lens having positive refractive power; the distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, half the diagonal length of the effective pixel area of ​​the image sensor is IMH, the angle of incidence of the principal ray of the maximum viewing angle of the imaging lens group on the imaging surface is CRA, and the following conditions are satisfied: 0.34 <TL / (IMH*CRA)<0.66。

Description

Technical Field

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

[0002] With the increasing popularity of smartphones and tablets, compact camera lenses are finding widespread application in a variety of electronic devices, such as game consoles, dashcams, and surveillance cameras. To ensure 24 / 7 usability, surveillance cameras often feature dual-band optical systems for both visible and infrared light. To ensure high image quality both day and night, surveillance cameras often consist of two separate optical systems. This design results in a larger size and a more complex overall structure. If a surveillance camera lens uses a system that shares both visible and infrared light, the image quality in the infrared band will be poor.

[0003] Furthermore, lens design typically needs to match chip specifications. Currently, most ultra-wide-angle lenses are paired with chips that have a large principal ray angle of incidence. This is because lenses designed for this angle can be shorter. Therefore, developing a chip that can achieve a short lens length while still maintaining high resolution, operating over a wide temperature range, and accommodating both visible and infrared wavelengths is a critical technical bottleneck that needs to be overcome. Summary of the Invention

[0004] The present invention provides a camera module having an imaging lens assembly comprising seven lenses with refractive power. When certain conditions are met, the imaging lens assembly provided by the present invention can achieve high-resolution imaging quality in both the visible and infrared bands. Furthermore, when used with a chip requiring a small principal ray incident angle, a short lens length and high resolution can still be achieved.

[0005] In addition, when the lens material is glass, the imaging lens assembly provided by the present invention can be used in an environment with a wide temperature range.

[0006] The present invention provides a camera module, comprising: a lens barrel; an imaging lens group disposed in the lens barrel; and an image sensor disposed on an imaging surface of the imaging lens group;

[0007] The imaging lens group includes, in order from the object side to the image side: a first lens having a negative refractive power, the object-side surface of the first lens being convex near the optical axis, and the image-side surface of the first lens being concave near the optical axis; a second lens having a negative refractive power, the object-side surface of the second lens being convex near the optical axis, and the image-side surface of the second lens being concave near the optical axis; a third lens having a positive refractive power, the object-side surface of the third lens being convex near the optical axis, and the image-side surface of the third lens being convex near the optical axis; an aperture; a fourth lens having a positive refractive power, the object-side surface of the fourth lens being convex near the optical axis, and the image-side surface of the fourth lens being convex near the optical axis; a fifth lens having a negative refractive power, the object-side surface of the fifth lens being concave near the optical axis, and the image-side surface of the fifth lens being concave near the optical axis; a sixth lens having a positive refractive power, the object-side surface of the sixth lens being convex near the optical axis, and the image-side surface of the sixth lens being convex near the optical axis; and a seventh lens having a positive refractive power, the object-side surface of the seventh lens being convex near the optical axis, and the image-side surface of the seventh lens being concave near the optical axis;

[0008] The distance from the object-side surface of the first lens to the imaging surface on the optical axis is TL, half of the diagonal length of the effective pixel region of the image sensor is IMH, and the angle of the chief ray of the maximum viewing angle of the imaging lens group incident on the imaging surface is CRA, and the following conditions are satisfied: 0.34 < TL / (IMH * CRA) < 0.66.

[0009] Preferably, the total number of lenses with refractive power in the imaging lens group is seven.

[0010] The effect of the present invention is that when the above seven lenses with refractive power are combined with 0.34 < TL / (IMH * CRA) < 0.66, it helps to achieve an appropriate balance between resolution and miniaturization, and makes the angle of the chief ray incident on the imaging surface meet the small-angle requirement. More preferably, the following conditions can also be satisfied: 0.42 < TL / (IMH * CRA) < 0.55.

[0011] Preferably, when the first lens or the third lens is made of glass, the imaging lens group can be used in an environment with a large temperature difference.

[0012] Preferably, the overall focal length of the imaging lens group is f, and the focal length of the second lens is f2, and the following conditions are satisfied: -0.65 < f / f2 < -0.29. Thus, the ratio of the focal length of the second lens to the focal length of the lens group can enhance its wide-angle characteristics to provide a larger viewing angle and maintain the illuminance of the lens group.

[0013] Preferably, the overall focal length of the imaging lens group is f, and the focal length of the seventh lens is f7, and the following conditions are satisfied: 0.21 < f / f7 < 0.4. Thereby, the ratio of the focal length of the seventh lens to the focal length of the lens group can reduce the volume of the lens group and reduce the angle of the chief ray incident on the imaging surface.

[0014] Preferably, the focal length of the fifth lens is f5, and the focal length of the sixth lens is f6, and the following conditions are satisfied: -0.87 < f5 / f6 < -0.3. Thereby, the refractive power distribution of the lens group is more appropriate, which is conducive to correcting the aberration of the lens group to improve the imaging quality of the lens group.

[0015] Preferably, the focal length of the first lens is f1, and the focal length of the fifth lens is f5, and the following conditions are satisfied: 1.05 < f1 / f5 < 1.92. Thereby, the refractive power distribution of the lens group is more appropriate, and the focus shift of the lens group in visible light and infrared light can be reduced.

[0016] Preferably, the thickness of the first lens on the optical axis is CT1, and the thickness of the third lens on the optical axis is CT3, and the following conditions are satisfied: 0.27 < CT1 / CT3 < 0.62. Thereby, the thickness of the first lens and the third lens can be balanced, which helps to achieve an appropriate balance between miniaturization and lens formability.

[0017] Preferably, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy the following conditions: 3.3 < R1 / R2 < 6.57. Thereby, a larger viewing angle is provided and the illuminance of the lens group is improved.

[0018] Preferably, the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy the following conditions: -0.65 < R5 / R6 < -0.28. Thereby, the influence of manufacturing tolerances on the imaging quality is reduced, and the lens has good formability.

[0019] Preferably, the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy the following conditions: 0.32 < R13 / R14 < 0.78. Thereby, it is conducive to correcting the aberration of the lens group and reducing the angle of the chief ray incident on the imaging surface.

[0020] Preferably, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, the radius of curvature R5 of the object side surface of the third lens, and the radius of curvature R6 of the image side surface of the third lens satisfy the following conditions: -3.0 < (R1 * R5) / (R2 * R6) < -1.17. Thereby, it helps to achieve an appropriate balance between miniaturization and lens formability.

[0021] Preferably, the angle of the chief ray of the maximum viewing angle of the imaging lens group incident on the imaging surface is CRA, and the distance from the image-side surface of the seventh lens to the imaging surface on the optical axis is BFL, and the following conditions are satisfied: 3.16 < CRA / BFL < 6.2. Thus, the angle of the chief ray incident on the imaging surface can be reduced, and the illuminance of the lens group can be improved.

[0022] Preferably, the maximum viewing angle of the imaging lens group is FOV, the angle of the chief ray of the maximum viewing angle of the imaging lens group incident on the imaging surface is CRA, and the radius of curvature R1 of the object-side surface of the first lens, and the following conditions are satisfied: 1.43 < FOV / (CRA * R1) < 2.3. It can provide a large viewing angle and satisfy the characteristic of the chief ray incident on the imaging surface at a small angle.

[0023] Preferably, half of the diagonal length of the effective pixel region of the image sensor is IMH, the distance from the object-side surface of the first lens to the imaging surface on the optical axis is TL, and the distance from the image-side surface of the seventh lens to the imaging surface on the optical axis is BFL, and the following conditions are satisfied: 0.22 < IMH / (TL - BFL) < 0.35. Thus, it helps to achieve an appropriate balance between resolution and miniaturization and satisfy a sufficient back focal length.

[0024] In each of the above camera modules, the maximum viewing angle of the imaging lens group is FOV, and the following conditions are satisfied: 147.00 (degrees) < FOV < 224.90 (degrees). Preferably, it can also satisfy 165.38 (degrees) < FOV < 206.16 (degrees). BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the camera module according to the first embodiment of the present invention.

[0026] Figure 2A is a schematic diagram of the imaging lens group according to the first embodiment of the present invention.

[0027] Figure 2B From left to right are the field curvature and distortion aberration curves of the imaging lens group according to the first embodiment, showing the states of field curvature and distortion aberration of the imaging lens group in the visible light and infrared light bands.

[0028] Figure 3A is a schematic diagram of the imaging lens group according to the second embodiment of the present invention.

[0029] Figure 3B From left to right are the field curvature and distortion aberration curves of the imaging lens group according to the second embodiment, showing the states of field curvature and distortion aberration of the imaging lens group in the visible light and infrared light bands.

[0030] Figure 4A FIG. 4 is a schematic diagram of an imaging lens assembly according to a third embodiment of the present invention.

[0031] Figure 4B From left to right are the image curvature and distortion aberration curves of the imaging lens set of the third embodiment, showing the image curvature and distortion aberration states of the imaging lens set in the visible light and infrared light bands.

[0032] Figure 5A FIG. 4 is a schematic diagram of an imaging lens assembly according to a fourth embodiment of the present invention.

[0033] Figure 5B From left to right are the image curvature and distortion aberration curves of the imaging lens set of the fourth embodiment, showing the image curvature and distortion aberration states of the imaging lens set in the visible light and infrared light bands.

[0034] Figure 6A FIG. 5 is a schematic diagram of an imaging lens assembly according to a fifth embodiment of the present invention.

[0035] Figure 6B From left to right are the image curvature and distortion aberration curves of the imaging lens set of the fifth embodiment, showing the image curvature and distortion aberration states of the imaging lens set in the visible light and infrared light bands.

[0036] Figure 7A FIG. 4 is a schematic diagram of an imaging lens assembly according to a sixth embodiment of the present invention.

[0037] Figure 7B From left to right are the image curvature and distortion aberration curves of the imaging lens set of the sixth embodiment, showing the image curvature and distortion aberration states of the imaging lens set in the visible light and infrared light bands.

[0038] In the picture:

[0039] 100, 200, 300, 400, 500, 600: aperture

[0040] 110, 210, 310, 410, 510, 610: First lens

[0041] 111, 211, 311, 411, 511, 611: Object side surface

[0042] 112, 212, 312, 412, 512, 612: Image side surface

[0043] 120, 220, 320, 420, 520, 620: Second lens

[0044] 121, 221, 321, 421, 521, 621: Object side surface

[0045] 122, 222, 322, 422, 522, 622: Image side surface

[0046] 130, 230, 330, 430, 530, 630: Third lens

[0047] 131, 231, 331, 431, 531, 631: Object side surface

[0048] 132, 232, 332, 432, 532, 632: Image side surface

[0049] 140, 240, 340, 440, 540, 640: fourth lens

[0050] 141, 241, 341, 441, 541, 641: Object-side surfaces

[0051] 142, 242, 342, 442, 542, 642: Image side surface

[0052] 150, 250, 350, 450, 550, 650: Fifth lens

[0053] 151, 251, 351, 451, 551, 651: Object side surface

[0054] 152, 252, 352, 452, 552, 652: Image side surface

[0055] 160, 260, 360, 460, 560, 660: Sixth lens

[0056] 161, 261, 361, 461, 561, 661: Object side surface

[0057] 162, 262, 362, 462, 562, 662: Image side surface

[0058] 170, 270, 370, 470, 570, 670: seventh lens

[0059] 171, 271, 371, 471, 571, 671: Object-side surfaces

[0060] 172, 272, 372, 472, 572, 672: Image side surfaces

[0061] 181, 281, 381, 481, 581, 681: filter components

[0062] 182, 282, 382, ​​482, 582, 682: Protection components

[0063] 183, 283, 383, 483, 583, 683: Imaging surface

[0064] 184, 284, 384, 484, 584, 684: Image sensors

[0065] 190, 290, 390, 490, 590, 690: optical axis

[0066] 10: Camera module

[0067] 11: Lens barrel

[0068] 12: Imaging lens group

[0069] f: overall focal length of the imaging lens group

[0070] Fno: aperture value of the imaging lens group

[0071] FOV: The maximum viewing angle of the imaging lens group

[0072] EPD: Entrance pupil diameter of the imaging lens group

[0073] f1: focal length of the first lens

[0074] f2: focal length of the second lens

[0075] f5: focal length of the fifth lens

[0076] f6: focal length of the sixth lens

[0077] f7: focal length of the seventh lens

[0078] R1: The radius of curvature of the object side surface of the first lens

[0079] R2: The radius of curvature of the image-side surface of the first lens

[0080] R5: The radius of curvature of the object side surface of the third lens

[0081] R6: Radius of curvature of the image-side surface of the third lens

[0082] R13: The radius of curvature of the object side surface of the seventh lens

[0083] R14: Radius of curvature of the image-side surface of the seventh lens

[0084] TL: The distance from the object side surface of the first lens to the imaging plane on the optical axis

[0085] CT1: Thickness of the first lens on the optical axis

[0086] CT3: Thickness of the third lens on the optical axis

[0087] IMH: Half the diagonal length of the image sensor's effective pixel area

[0088] CRA: The angle of the principal ray incident on the imaging surface at the maximum viewing angle of the imaging lens group

[0089] BFL: The distance from the image side surface of the seventh lens to the imaging plane on the optical axis DETAILED DESCRIPTION

[0090] The following is a clear and complete description of the technical solution of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0091] <First embodiment>

[0092] like Figure 1 , is a camera module of the first embodiment of the present invention. In this embodiment, the camera module is applied to a monitor camera lens, but is not limited thereto and can also be applied to electronic devices such as game consoles and driving recorders. The camera module 10 includes a lens barrel 11, an imaging lens group 12 and an image sensor 184. In addition, Figure 1 The lenses of the imaging lens group are drawn to show the peripheral portion where no light is taken in. Figure 2A The lenses depicted are slightly different. The imaging lens assembly 12 is disposed within the lens barrel 11. The image sensor 184 is disposed on the imaging surface 183 of the imaging lens assembly 12 and is an electronic photosensitive component (such as a CMOS or CCD) with excellent brightness and low noise, so as to truly present the imaging quality of the imaging lens assembly.

[0093] like Figure 2A and Figure 2B ,in Figure 2A is a schematic diagram of an imaging lens assembly according to a first embodiment of the present invention, Figure 2B From left to right are the image plane curvature and distortion aberration curves of the imaging lens set of the first embodiment, showing the image plane curvature and distortion aberration of the imaging lens set in the visible light and infrared light bands. Figure 2A As can be seen, the imaging lens assembly includes, from the object side to the image side along optical axis 190, a first lens 110, a second lens 120, a third lens 130, an aperture 100, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, a filter element 181, a protective element 182, and an imaging surface 183. The imaging lens assembly is used in conjunction with the image sensor 184. The imaging lens assembly comprises seven lenses with refractive power, but this is not limited to one embodiment.

[0094] The first lens 110 has negative refractive power and is made of glass. The object-side surface 111 thereof is convex near the optical axis 190 , and the image-side surface 112 thereof is concave near the optical axis 190 .

[0095] The second lens 120 has negative refractive power and is made of plastic. Its object-side surface 121 is convex near the optical axis 190 , and its image-side surface 122 is concave near the optical axis 190 . Both the object-side surface 121 and the image-side surface 122 are aspherical.

[0096] The third lens 130 has positive refractive power and is made of glass. Its object-side surface 131 is convex near the optical axis 190 , and its image-side surface 132 is convex near the optical axis 190 .

[0097] The fourth lens 140 has positive refractive power and is made of plastic. Its object-side surface 141 is convex near the optical axis 190 , and its image-side surface 142 is convex near the optical axis 190 . Both the object-side surface 141 and the image-side surface 142 are aspherical.

[0098] The fifth lens element 150 has negative refractive power and is made of plastic. Its object-side surface 151 is concave near the optical axis 190 , and its image-side surface 152 is concave near the optical axis 190 . Both the object-side surface 151 and the image-side surface 152 are aspherical.

[0099] The sixth lens element 160 has positive refractive power and is made of plastic. Its object-side surface 161 is convex near the optical axis 190 , and its image-side surface 162 is convex near the optical axis 190 . Both the object-side surface 161 and the image-side surface 162 are aspherical.

[0100] The seventh lens element 170 has positive refractive power and is made of plastic. Its object-side surface 171 is convex near the optical axis 190 , and its image-side surface 172 is concave near the optical axis 190 . Both the object-side surface 171 and the image-side surface 172 are aspherical.

[0101] The filter assembly 181 is made of glass and is positioned between the seventh lens 170 and the imaging surface 183 without affecting the focal length of the imaging lens assembly. In this embodiment, an infrared cut filter removable (ICR) is used, which is a set of automatically switchable filters. The filter switching determines whether the image sensor can receive infrared light. The timing of the filter switching depends on the intensity of visible light detected by the image sensor of the camera lens, but is not limited to this. Alternatively, filters that allow visible light to pass, filters that allow infrared light to pass, or filters that allow both visible and infrared light to pass may be used.

[0102] The protection component 182 is made of glass and is disposed between the filter component 181 and the imaging surface 183 without affecting the focal length of the imaging lens assembly.

[0103] The curve equations of the aspheric surfaces of the above lenses are expressed as follows:

[0104]

[0105] Where z is the position value at a height h along the optical axis 190 with reference to the surface vertex; c is the curvature of the lens surface near the optical axis 190 and is the inverse 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 vertical distance of the lens surface from the optical axis 190, k is the conic constant, and Ai is the i-th order aspheric coefficient.

[0106] In the imaging lens group of the first embodiment, the overall focal length of the imaging lens group is f, the aperture value (f-number) of the imaging lens group is Fno, the maximum viewing angle in the imaging lens group is FOV, and the entrance pupil diameter of the imaging lens group is EPD, and its values ​​are as follows: f = 2.01 (mm); Fno = 2.00; FOV = 186.1 (degrees); and EPD = 0.96 (mm).

[0107] In the imaging lens assembly of the first embodiment, the distance between the object-side surface 111 of the first lens 110 and the imaging plane 183 on the optical axis 190 is TL, half of the diagonal length of the effective pixel area of ​​the image sensor 184 is IMH, and the angle of the principal ray of the maximum viewing angle of the imaging lens assembly incident on the imaging plane 183 is CRA, and the following condition is satisfied: TL / (IMH*CRA)=0.42.

[0108] In the imaging lens group of the first embodiment, the overall focal length of the imaging lens group is f, the focal length of the second lens is f2, and the following condition is satisfied: f / f2=-0.54.

[0109] In the imaging lens group of the first embodiment, the overall focal length of the imaging lens group is f, the focal length of the seventh lens is f7, and the following condition is satisfied: f / f7=0.33.

[0110] In the imaging lens assembly of the first embodiment, the focal length of the fifth lens 150 is f5, the focal length of the sixth lens 160 is f6, and the following condition is satisfied: f5 / f6=-0.52.

[0111] In the imaging lens assembly of the first embodiment, the focal length of the first lens 110 is f1, the focal length of the fifth lens 150 is f5, and the following condition is satisfied: f1 / f5=1.46.

[0112] In the imaging lens assembly of the first embodiment, the thickness of the first lens 110 on the optical axis 190 is CT1, the thickness of the third lens 130 on the optical axis 190 is CT3, and the following condition is satisfied: CT1 / CT3=0.52.

[0113] In the imaging lens assembly of the first embodiment, the curvature radius R1 of the object-side surface 111 of the first lens 110 and the curvature radius R2 of the image-side surface 112 of the first lens 110 satisfy the following condition: R1 / R2=4.18.

[0114] In the imaging lens assembly of the first embodiment, the curvature radius R5 of the object-side surface 131 of the third lens 130 and the curvature radius R6 of the image-side surface 132 of the third lens 130 satisfy the following condition: R5 / R6=-0.54.

[0115] In the imaging lens group of the first embodiment, the curvature radius R13 of the object-side surface 171 of the seventh lens 170 and the curvature radius R14 of the image-side surface 172 of the seventh lens 170 satisfy the following condition: R13 / R14=0.49.

[0116] In the imaging lens group of the first embodiment, the curvature radius R1 of the object-side surface 111 of the first lens 110, the curvature radius R2 of the image-side surface 112 of the first lens 110, the curvature radius R5 of the object-side surface 131 of the third lens 130, and the curvature radius R6 of the image-side surface 132 of the third lens 130 satisfy the following condition: (R1*R5) / (R2*R6)=-2.25.

[0117] In the imaging lens assembly of the first embodiment, the angle of incidence of the principal ray of the maximum viewing angle of the imaging lens assembly on the imaging plane is CRA, and the distance between the image-side surface 172 of the seventh lens element 170 and the imaging plane 183 on the optical axis 190 is BFL, and the following condition is satisfied: CRA / BFL=5.12.

[0118] In the imaging lens group of the first embodiment, the maximum viewing angle of the imaging lens group is FOV, the angle at which the principal ray of the maximum viewing angle of the imaging lens group is incident on the imaging surface 183 is CRA, the curvature radius R1 of the object-side surface 111 of the first lens 110 satisfies the following condition: FOV / (CRA*R1)=1.87.

[0119] In the imaging lens assembly of the first embodiment, half the diagonal length of the effective pixel area of ​​the image sensor 183 is IMH, the distance from the object-side surface 111 of the first lens 110 to the imaging plane 183 on the optical axis 190 is TL, and the distance from the image-side surface 172 of the seventh lens 170 to the imaging plane 183 on the optical axis 190 is BFL, and the following condition is satisfied: IMH / (TL-BFL)=0.28.

[0120] Refer to Table 1 and Table 2 below.

[0121]

[0122]

[0123]

[0124] Table 1 is Figure 2A Detailed structural data of the first embodiment, where the units of curvature radius, thickness, gap, and focal length are in mm, and surfaces 0-20 represent surfaces from the object side to the image side, in order. Surface 0 is the gap between the object and the object-side surface 111 of the first lens 110 on the optical axis 190; surfaces 1, 3, 5, 8, 10, 12, 14, 16, and 18 are the thicknesses of the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, the seventh lens 170, the filter assembly 181, and the protective assembly 182 on the optical axis 190, respectively; surface 2 is the gap between the first lens 110 and the second lens 120 on the optical axis 190; and surface 4 is the gap between the second lens 120 and the third lens 130 on the optical axis 190. Surface 6 is the gap between the third lens 130 and the aperture 100 on the optical axis 190, surface 7 is the gap between the aperture 100 and the object-side surface 141 of the fourth lens 140 on the optical axis 190, surface 9 is the gap between the fourth lens 140 and the fifth lens 150 on the optical axis 190, surface 11 is the gap between the fifth lens 150 and the sixth lens 160 on the optical axis 190, surface 13 is the gap between the sixth lens 160 and the seventh lens 170 on the optical axis 190, surface 15 is the gap between the seventh lens 170 and the filter assembly 181 on the optical axis 190, surface 17 is the gap between the filter assembly 181 and the protective assembly 182 on the optical axis 190, and surface 19 is the gap between the protective assembly 182 and the imaging surface 183 on the optical axis 190.

[0125] Table 2 shows the aspheric surface data for the first embodiment, where k is the conic coefficient in the aspheric curve equation, and A2, A4, A6, A8, A10, A12, A14, and A16 are high-order aspheric coefficients. Furthermore, the tables below provide schematic diagrams and image curvature curves corresponding to each embodiment. The definitions of the data in these tables are the same as those in Tables 1 and 2 of the first embodiment and are not further elaborated here.

[0126] <Second embodiment>

[0127] The second embodiment of the present invention provides a camera module, which is different from the first embodiment in the design of the imaging lens group. Figure 3A and Figure 3B ,in Figure 3A is a schematic diagram of an imaging lens assembly according to a second embodiment of the present invention, Figure 3B From left to right are the image plane curvature and distortion aberration curves of the imaging lens set of the second embodiment, showing the image plane curvature and distortion aberration of the imaging lens set in the visible light and infrared light bands. Figure 3A As can be seen, the imaging lens assembly includes, in order from the object side to the image side along optical axis 290, a first lens 210, a second lens 220, a third lens 230, an aperture 200, a fourth lens 240, a fifth lens 250, a sixth lens 260, a seventh lens 270, a filter element 281, a protective element 282, and an imaging surface 283. The imaging lens assembly is used in conjunction with an image sensor 284. The imaging lens assembly comprises seven lenses with refractive power, but this is not a limitation. The image sensor 284 is disposed on the imaging surface 283.

[0128] The first lens 210 has negative refractive power and is made of glass. The object-side surface 211 of the first lens 210 is convex near the optical axis 290 , and the image-side surface 212 of the first lens 210 is concave near the optical axis 290 .

[0129] The second lens 220 has negative refractive power and is made of plastic. Its object-side surface 221 is convex near the optical axis 290 , and its image-side surface 222 is concave near the optical axis 290 . Both the object-side surface 221 and the image-side surface 222 are aspherical.

[0130] The third lens 230 has positive refractive power and is made of glass. Its object-side surface 231 is convex near the optical axis 290 , and its image-side surface 232 is convex near the optical axis 290 .

[0131] The fourth lens 240 has positive refractive power and is made of plastic. Its object-side surface 241 is convex near the optical axis 290 , and its image-side surface 242 is convex near the optical axis 290 . Both the object-side surface 241 and the image-side surface 242 are aspherical.

[0132] The fifth lens element 250 has negative refractive power and is made of plastic. Its object-side surface 251 is concave 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.

[0133] The sixth lens 260 has positive refractive power and is made of plastic. Its object-side surface 261 is convex near the optical axis 290 , and its image-side surface 262 is convex near the optical axis 290 . Both the object-side surface 261 and the image-side surface 262 are aspherical.

[0134] The seventh lens element 270 has positive refractive power and is made of plastic. Its object-side surface 271 is convex near the optical axis 290 , and its image-side surface 272 is concave near the optical axis 290 . Both the object-side surface 271 and the image-side surface 272 are aspherical.

[0135] The filter assembly 281 is made of glass and is positioned between the seventh lens 270 and the imaging surface 283 without affecting the focal length of the imaging lens assembly. In this embodiment, an infrared filter removable (ICR) is used, which is a set of automatically switchable filters. The filter switching determines whether the image sensor can receive infrared light. The timing of the filter switching depends on the intensity of visible light detected by the image sensor of the camera lens, but is not limited to this. Filters that allow visible light to pass, filters that allow infrared light to pass, or filters that allow both visible and infrared light to pass may also be used.

[0136] The protection component 282 is made of glass and is disposed between the filter component 281 and the imaging surface 283 without affecting the focal length of the imaging lens assembly.

[0137] Refer to Table 3 and Table 4 below.

[0138]

[0139]

[0140]

[0141]

[0142] In the second embodiment, the curve equation of the aspheric surface is expressed in the same form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment and are not repeated here.

[0143] Combining Table 3 and Table 4, the following data can be calculated:

[0144]

[0145] <Third embodiment>

[0146] The third embodiment of the present invention provides a camera module, which differs from the first embodiment in the design of the imaging lens group. Figure 4A and Figure 4B ,in Figure 4A is a schematic diagram of an imaging lens assembly according to a third embodiment of the present invention, Figure 4B From left to right are the image plane curvature and distortion aberration curves of the imaging lens set of the third embodiment, showing the image plane curvature and distortion aberration of the imaging lens set in the visible light and infrared light bands. Figure 4A As can be seen, the imaging lens assembly includes, from the object side to the image side along optical axis 390, a first lens 310, a second lens 320, a third lens 330, an aperture 300, a fourth lens 340, a fifth lens 350, a sixth lens 360, a seventh lens 370, a filter element 381, a protective element 382, ​​and an imaging surface 383. The imaging lens assembly is used in conjunction with an image sensor 384. The imaging lens assembly comprises seven lenses with refractive power, but this is not a limitation. The image sensor 384 is disposed on the imaging surface 383.

[0147] The first lens 310 has negative refractive power and is made of glass. 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 .

[0148] The second lens 320 has negative refractive power and is made of plastic. Its object-side surface 321 is convex near the optical axis 390 , and its image-side surface 322 is concave near the optical axis 390 . Both the object-side surface 321 and the image-side surface 322 are aspherical.

[0149] The third lens 330 has 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.

[0150] The fourth lens 340 has positive refractive power and is made of plastic. Its object-side surface 341 is convex 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.

[0151] The fifth lens element 350 has negative refractive power and is made of plastic. Its object-side surface 351 is concave 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.

[0152] The sixth lens 360 has positive refractive power and is made of plastic. Its object-side surface 361 is convex near the optical axis 390 , and its image-side surface 362 is convex near the optical axis 390 . Both the object-side surface 361 and the image-side surface 362 are aspherical.

[0153] The seventh lens element 370 has positive refractive power and is made of plastic. Its object-side surface 371 is convex near the optical axis 390 , and its image-side surface 372 is concave near the optical axis 390 . Both the object-side surface 371 and the image-side surface 372 are aspherical.

[0154] The filter assembly 381 is made of glass and is positioned between the seventh lens 370 and the imaging surface 383 without affecting the focal length of the imaging lens assembly. In this embodiment, an infrared filter removable (ICR) is used, which is a set of automatically switchable filters. The filter switching determines whether the image sensor can receive infrared light. The timing of the filter switching depends on the intensity of visible light detected by the image sensor of the camera lens, but is not limited to this. Filters that allow visible light to pass, filters that allow infrared light to pass, or filters that allow both visible and infrared light to pass may also be used.

[0155] The protection component 382 is made of glass and is disposed between the filter component 381 and the imaging surface 383 without affecting the focal length of the imaging lens group.

[0156] Refer to Table 5 and Table 6 below.

[0157]

[0158]

[0159]

[0160] In the third embodiment, the curve equation of the aspheric surface is expressed in the same form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment and are not repeated here.

[0161] Combining Table 5 and Table 6, the following data can be calculated:

[0162]

[0163]

[0164] <Fourth embodiment>

[0165] The fourth embodiment of the present invention provides a camera module, which differs from the first embodiment in the design of the imaging lens group. Figure 5A and Figure 5B ,in Figure 5A is a schematic diagram of an imaging lens assembly according to a fourth embodiment of the present invention, Figure 5B From left to right are the image plane curvature and distortion aberration curves of the imaging lens set of the fourth embodiment, showing the image plane curvature and distortion aberration of the imaging lens set in the visible light and infrared light bands. Figure 5A As can be seen, the imaging lens assembly includes, in order from the object side to the image side along optical axis 490, a first lens 410, a second lens 420, a third lens 430, an aperture 400, a fourth lens 440, a fifth lens 450, a sixth lens 460, a seventh lens 470, a filter element 481, a protective element 482, and an imaging surface 483. The imaging lens assembly is used in conjunction with an image sensor 484. The imaging lens assembly comprises seven lenses with refractive power, but this is not a limitation. The image sensor 484 is disposed on the imaging surface 483.

[0166] The first lens 410 has 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 .

[0167] The second lens 420 has negative refractive power and is made of plastic. Its object-side surface 421 is convex near the optical axis 490 , and its image-side surface 422 is concave near the optical axis 490 . Both the object-side surface 421 and the image-side surface 422 are aspherical.

[0168] The third lens element 430 has positive refractive power and is made of glass. 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 .

[0169] The fourth lens 440 has positive refractive power and is made of plastic. Its object-side surface 441 is convex near the optical axis 490 , and its image-side surface 442 is convex near the optical axis 490 . Both the object-side surface 441 and the image-side surface 442 are aspherical.

[0170] The fifth lens element 450 has negative refractive power and is made of plastic. Its object-side surface 451 is concave near the optical axis 490 , and its image-side surface 452 is concave near the optical axis 490 . Both the object-side surface 451 and the image-side surface 452 are aspherical.

[0171] The sixth lens 460 has positive refractive power and is made of plastic. Its object-side surface 461 is convex near the optical axis 490 , and its image-side surface 462 is convex near the optical axis 490 . Both the object-side surface 461 and the image-side surface 462 are aspherical.

[0172] The seventh lens element 470 has positive refractive power and is made of plastic. Its object-side surface 471 is convex near the optical axis 490 , and its image-side surface 472 is concave near the optical axis 490 . Both the object-side surface 471 and the image-side surface 472 are aspherical.

[0173] The filter assembly 481 is made of glass and is positioned between the seventh lens 470 and the imaging surface 483 without affecting the focal length of the imaging lens assembly. In this embodiment, an infrared filter removable (ICR) is used, which is a set of automatically switchable filters. The filter switching determines whether the image sensor can receive infrared light. The timing of the filter switching depends on the intensity of visible light detected by the image sensor of the camera lens, but is not limited to this. Alternatively, filters that allow visible light to pass, filters that allow infrared light to pass, or filters that allow both visible and infrared light to pass may be used.

[0174] The protection component 482 is made of glass and is disposed between the filter component 481 and the imaging surface 483 without affecting the focal length of the imaging lens group.

[0175] Refer to Table 7 and Table 8 below.

[0176]

[0177]

[0178]

[0179] In the fourth embodiment, the curve equation of the aspheric surface is expressed in the same form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment and are not repeated here.

[0180] Combining Table 7 and Table 8, the following data can be calculated:

[0181]

[0182] <Fifth embodiment>

[0183] The fifth embodiment of the present invention provides a camera module, which differs from the first embodiment in the design of the imaging lens group. Figure 6A and Figure 6B ,in Figure 6A is a schematic diagram of an imaging lens assembly according to a fifth embodiment of the present invention, Figure 6B From left to right are the image plane curvature and distortion aberration curves of the imaging lens set of the fifth embodiment, showing the image plane curvature and distortion aberration of the imaging lens set in the visible light and infrared light bands. Figure 6AAs can be seen, the imaging lens assembly includes, from the object side to the image side along optical axis 590, a first lens 510, a second lens 520, a third lens 530, an aperture 500, a fourth lens 540, a fifth lens 550, a sixth lens 560, a seventh lens 570, a filter element 581, a protective element 582, and an imaging surface 583. The imaging lens assembly is used in conjunction with an image sensor 584. The imaging lens assembly comprises seven lenses with refractive power, but this is not a limitation. The image sensor 584 is disposed on the imaging surface 583.

[0184] The first lens 510 has 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 .

[0185] The second lens 520 has negative refractive power and is made of plastic. Its object-side surface 521 is convex near the optical axis 590, and its image-side surface 522 is concave near the optical axis 590. Both the object-side surface 521 and the image-side surface 522 are aspherical.

[0186] The third lens 530 has positive refractive power and is made of glass. 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 .

[0187] The fourth lens 540 has positive refractive power and is made of plastic. Its object-side surface 541 is convex 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.

[0188] The fifth lens element 550 has negative refractive power and is made of plastic. Its object-side surface 551 is concave 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.

[0189] The sixth lens 560 has positive refractive power and is made of plastic. Its object-side surface 561 is convex near the optical axis 590 , and its image-side surface 562 is convex near the optical axis 590 . Both the object-side surface 561 and the image-side surface 562 are aspherical.

[0190] The seventh lens 570 has positive refractive power and is made of plastic. Its object-side surface 571 is convex near the optical axis 590, and its image-side surface 572 is concave near the optical axis 590. Both the object-side surface 571 and the image-side surface 572 are aspherical.

[0191] The filter assembly 581 is made of glass and is positioned between the seventh lens 570 and the imaging surface 583 without affecting the focal length of the imaging lens assembly. In this embodiment, an infrared filter removable (ICR) is used, which is a set of automatically switchable filters. The filter switching determines whether the image sensor can receive infrared light. The timing of the filter switching depends on the intensity of visible light detected by the image sensor of the camera lens, but is not limited to this. Filters that allow visible light to pass, filters that allow infrared light to pass, or filters that allow both visible and infrared light to pass may also be used.

[0192] The protection component 582 is made of glass and is disposed between the filter component 581 and the imaging surface 583 without affecting the focal length of the imaging lens group.

[0193] Refer to Table 9 and Table 10 below.

[0194]

[0195]

[0196]

[0197]

[0198] In the fifth embodiment, the curve equation of the aspheric surface is expressed in the same form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment and are not repeated here.

[0199] Combining Table 9 and Table 10, the following data can be calculated:

[0200]

[0201] <Sixth embodiment>

[0202] The sixth embodiment of the present invention provides a camera module, which differs from the first embodiment in the design of the imaging lens group. Figure 7A and Figure 7B ,in Figure 7A is a schematic diagram of an imaging lens assembly according to a sixth embodiment of the present invention, Figure 7B From left to right are the image plane curvature and distortion aberration curves of the imaging lens set of the sixth embodiment, showing the image plane curvature and distortion aberration of the imaging lens set in the visible light and infrared light bands. Figure 7AAs can be seen, the imaging lens assembly includes, in order from the object side to the image side along optical axis 690, a first lens 610, a second lens 620, a third lens 630, an aperture 600, a fourth lens 640, a fifth lens 650, a sixth lens 660, a seventh lens 670, a filter element 681, a protective element 682, and an imaging surface 683. The imaging lens assembly is used in conjunction with an image sensor 684. The imaging lens assembly comprises seven lenses with refractive power, but this is not a limitation. The image sensor 684 is disposed on the imaging surface 683.

[0203] The first lens 610 has negative refractive power and is made of glass. 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 .

[0204] The second lens 620 has negative refractive power and is made of plastic. Its object-side surface 621 is convex near the optical axis 690 , and its image-side surface 622 is concave near the optical axis 690 . Both the object-side surface 621 and the image-side surface 622 are aspherical.

[0205] The third lens 630 has positive refractive power and is made of glass. 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 .

[0206] The fourth lens 640 has positive refractive power and is made of plastic. Its object-side surface 641 is convex near the optical axis 690 , and its image-side surface 642 is convex near the optical axis 690 . Both the object-side surface 641 and the image-side surface 642 are aspherical.

[0207] The fifth lens 650 has negative refractive power and is made of plastic. Its object-side surface 651 is concave near the optical axis 690 , and its image-side surface 652 is concave near the optical axis 690 . Both the object-side surface 651 and the image-side surface 652 are aspherical.

[0208] The sixth lens 660 has positive refractive power and is made of plastic. Its object-side surface 661 is convex near the optical axis 690 , and its image-side surface 662 is convex near the optical axis 690 . Both the object-side surface 661 and the image-side surface 662 are aspherical.

[0209] The seventh lens 670 has positive refractive power and is made of plastic. Its object-side surface 671 is convex near the optical axis 690, and its image-side surface 672 is concave near the optical axis 690. Both the object-side surface 671 and the image-side surface 672 are aspherical.

[0210] The filter assembly 681 is made of glass and is positioned between the seventh lens 670 and the imaging surface 683 without affecting the focal length of the imaging lens assembly. In this embodiment, an infrared filter removable (ICR) is used, which is a set of automatically switchable filters. The filter switching determines whether the image sensor can receive infrared light. The timing of the filter switching depends on the intensity of visible light detected by the image sensor of the camera lens, but is not limited to this. Filters that allow visible light to pass, filters that allow infrared light to pass, or filters that allow both visible and infrared light to pass may also be used.

[0211] The protection component 682 is made of glass and is disposed between the filter component 681 and the imaging surface 683 without affecting the focal length of the imaging lens group.

[0212] Please refer to Table 11 and Table 12 below.

[0213]

[0214]

[0215]

[0216] In the sixth embodiment, the curve equation of the aspheric surface is expressed in the same form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as in the first embodiment and are not repeated here.

[0217] Combining Table 11 and Table 12, the following data can be calculated:

[0218]

[0219] The imaging lens assembly provided by the present invention can be made of either plastic or glass. Plastic lenses can effectively reduce production costs, while glass lenses can increase the flexibility of refractive power configuration. Furthermore, both the object-side and image-side surfaces of the lenses in the imaging lens assembly can be aspherical. Aspherical surfaces can be easily fabricated into shapes other than spherical surfaces, providing a greater number of control variables for reducing aberrations and, consequently, reducing the number of lenses used. This effectively reduces the overall length of the imaging lens assembly provided by the present invention.

[0220] The imaging lens assembly provided by the present invention, the filter component and the protective component are made of glass, but are not limited thereto and may also be made of other materials with high dispersion coefficients.

[0221] In the imaging lens assembly provided by the present invention, with respect to 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 at the near 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 at the near optical axis.

[0222] The imaging lens assembly provided by the present invention can be applied to optical systems with mobile focus according to needs, and has the characteristics of excellent aberration correction and good imaging quality. It can be widely used in electronic imaging systems such as 3D (three-dimensional) image capture, digital cameras, mobile devices, digital drawing tablets, or automotive photography.

[0223] In summary, the above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A camera module, characterized in that: Comprising: A lens barrel; An imaging lens group disposed within the lens barrel; and An image sensor disposed on the imaging plane of the imaging lens group; Wherein the imaging lens group sequentially includes, from the object side to the image side: A first lens having a negative refractive power, the object-side surface of the first lens being convex near the optical axis, and the image-side surface of the first lens being concave near the optical axis; A second lens having a negative refractive power, the object-side surface of the second lens being convex near the optical axis, and the image-side surface of the second lens being concave near the optical axis; A third lens having a positive refractive power, the object-side surface of the third lens being convex near the optical axis, and the image-side surface of the third lens being convex near the optical axis; An aperture; A fourth lens having a positive refractive power, the object-side surface of the fourth lens being convex near the optical axis, and the image-side surface of the fourth lens being convex near the optical axis; A fifth lens having a negative refractive power, the object-side surface of the fifth lens being concave near the optical axis, and the image-side surface of the fifth lens being concave near the optical axis; A sixth lens having a positive refractive power, the object-side surface of the sixth lens being convex near the optical axis, and the image-side surface of the sixth lens being convex near the optical axis; And A seventh lens having a positive refractive power, the object-side surface of the seventh lens being convex near the optical axis, and the image-side surface of the seventh lens being concave near the optical axis; Wherein the total number of lenses with refractive power in the imaging lens group is seven, the distance from the object-side surface of the first lens to the imaging plane on the optical axis is TL, half of the diagonal length of the effective pixel region of the image sensor is IMH, the angle of the chief ray of the maximum viewing angle of the imaging lens group incident on the imaging plane is CRA, the radius of curvature R13 of the object-side surface of the seventh lens, the radius of curvature R14 of the image-side surface of the seventh lens, and the following conditions are satisfied: 0.34 < TL / (IMH * CRA) < 0.66 and 0.32 < R13 / R14 < 0.

78.

2. The camera module according to claim 1, wherein: The overall focal length of the imaging lens group is f, the focal length of the second lens is f2, and the following conditions are satisfied: -0.65 < f / f2 < -0.

29.

3. The camera module according to claim 1, wherein: The overall focal length of the imaging lens group is f, the focal length of the seventh lens is f7, and the following conditions are satisfied: 0.21 < f / f7 < 0.

4.

4. The camera module according to claim 1, wherein: The focal length of the fifth lens is f5, the focal length of the sixth lens is f6, and the following conditions are satisfied: -0.87 < f5 / f6 < -0.

3.

5. The camera module according to claim 1, wherein: The focal length of the first lens is f1, the focal length of the fifth lens is f5, and the following conditions are satisfied: 1.05 < f1 / f5 < 1.

92.

6. The camera module according to claim 1, wherein: The thickness of the first lens on the optical axis is CT1, the thickness of the third lens on the optical axis is CT3, and the following conditions are satisfied: 0.27 < CT1 / CT3 < 0.

62.

7. The camera module according to claim 1, wherein: The radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, and the following conditions are satisfied: 3.3 < R1 / R2 < 6.

57.

8. The camera module according to claim 1, wherein: The curvature radius of the object side surface of the third lens is R5, and the curvature radius of the image side surface of the third lens is R6, and the following conditions are met: -0.65 <R5 / R6<-0.28。 9. The camera module according to claim 1, wherein: The curvature radius R1 of the object-side surface of the first lens, the curvature radius R2 of the image-side surface of the first lens, the curvature radius R5 of the object-side surface of the third lens, and the curvature radius R6 of the image-side surface of the third lens satisfy the following condition: -3.0<(R1*R5) / (R2*R6)<-1.

17.

10. The camera module according to claim 1, wherein: The angle of the principal ray of the maximum viewing angle of the imaging lens group incident on the imaging plane is CRA, the distance from the image side surface of the seventh lens to the imaging plane on the optical axis is BFL, and the following conditions are met: 3.16 <CRA / BFL<6.2。 11. The camera module according to claim 1, wherein: The maximum viewing angle of the imaging lens group is FOV, the angle of the incident principal ray of the imaging lens group at the maximum viewing angle is CRA, the curvature radius R1 of the object side surface of the first lens satisfies the following conditions: 1.43 <FOV / (CRA*R1)<2.3。 12. The camera module according to claim 1, wherein: The half of the diagonal length of the effective pixel area of ​​the image sensor is IMH, the distance from the object side surface of the first lens to the imaging plane on the optical axis is TL, the distance from the image side surface of the seventh lens to the imaging plane on the optical axis is BFL, and the following conditions are met: 0.22 <IMH / (TL-BFL)<0.35。

Images