Imaging lens group and camera module

Abstract

The invention provides an imaging lens group, which sequentially comprises a first lens element with negative refractive power, a second lens element with negative refractive power and a third lens element from an object side to an image side, a second lens element with negative refractive power; a third lens element with positive refractive power; a fourth lens element with positive refractive power; a fifth lens element with negative refractive power; a sixth lens element with positive refractive power; and a seventh lens element with negative refractive power, wherein the angle of the maximum angle of view principal ray incident imaging surface of the imaging lens group is CRA, the maximum effective radius of the object side surface of the first lens is CA1, the maximum effective radius of the image side surface of the seventh lens is CA14, and the following condition is satisfied: CRA * CA14 / CA1 is more than 14.42 degrees and less than 23.66 degrees.

Description

Technical Field

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

[0002] Small camera lenses can be widely used in various electronic products, such as wearable displays, smart phones, tablet computers, game consoles, driving recorders, home electronic devices, network surveillance cameras (IPCAM), sports cameras or drone lenses, etc. At the same time, small camera lenses are constantly moving towards the direction of being thinner and shorter. The smaller the size, the more sensitive the manufacturing and assembly will be, making mass production difficult and increasing mass production costs. Or in order to reduce assembly tolerances, the peripheral imaging quality has to be sacrificed, making the peripheral imaging blurred or deformed. Therefore, how to develop a small camera lens that can solve one of the above problems is a technical bottleneck that is currently being overcome. Summary of the invention

[0003] The purpose of the present invention is to provide an imaging lens group and a camera module. The imaging lens group includes seven lenses with refractive power. When certain conditions are met, the imaging lens group provided by the present invention can solve the current problems of small lens sensitivity and imaging quality. The present invention provides a wide viewing angle, high resolution, low distortion and low manufacturing and assembly tolerance sensitivity, thereby improving product quality and yield.

[0004] In addition, when the lens material is glass, the imaging lens assembly provided by the present invention can be used in an environment with relatively extreme temperatures.

[0005] An imaging lens group provided by the present invention according to one embodiment includes, 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; 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 negative refractive power.

[0006] In an imaging lens group, the total number of lenses with refractive power in the imaging lens group is seven, the angle of the principal ray of the imaging lens group incident on the imaging surface is CRA, the maximum effective radius of the object side surface of the first lens is CA1, the maximum effective radius of the image side surface of the seventh lens is CA14, the curvature radius of the image side surface of the first lens is R2, the curvature radius of the object side surface of the second lens is R3, the curvature radius of the image side surface of the second lens is R4, the curvature radius of the image side surface of the fourth lens is R8, the curvature radius of the object side surface of the fifth lens is R9, the curvature radius of the object side surface of the sixth lens is R11, the curvature radius of the image side surface of the seventh lens is R14, the maximum viewing angle in the imaging lens group is FOV, and the maximum viewing angle in the imaging lens group half of the optical axis is HFOV, the distance between the second lens and the third lens on the optical axis is T23, the distance between the third lens and the fourth lens on the optical axis is T34, the distance between the fourth lens and the fifth lens on the optical axis is T45, the distance between the fifth lens and the sixth lens on the optical axis is T56, the thickness of the second lens on the optical axis is CT2, the thickness of the fourth lens on the optical axis is CT4, the thickness of the sixth lens on the optical axis is CT6, the entrance pupil diameter of the imaging lens group is EPD, the distance from the image side surface of the seventh lens to the imaging plane on the optical axis is BFL, the distance from the object side surface of the first lens to the imaging plane on the optical axis is TL, the maximum imaging height of the imaging lens group is IMH, and at least one of the following conditions is satisfied:

[0007] 14.42°<CRA*CA14 / CA1<23.66°;

[0008] -34.87<R4 / R2<-1;

[0009] 0.88<(R3+R4) / (R8+R9)<3.9;

[0010] 1.67<HFOV / CRA<2.69;

[0011] 0.57<(T34+T45) / CT4<1.8;

[0012] -330.49mm 2 <EPD*(R3+R4)<-3.21mm 2 ;

[0013] -3.91mm<(R3 / R14)*CT6<-0.48mm;

[0014] -34.6°<HFOV*BFL / R4<-0.69°;

[0015] 0.14<R3*TL / (R4*IMH)<3.22;

[0016] 107.2°<HFOV*CA1 / CA14<201.35°;

[0017] -26.61<R11*T56 / (R4*T23)<-0.14;

[0018] 1.14<CA1 / IMH<1.85;

[0019] 0.62<CT2 / EPD<1.66;

[0020] 0.71mm<EPD<1.79mm;

[0021] 142.50°<FOV<178.50°;

[0022] 2.55mm<IMH<6.35mm.

[0023] When 14.42°<CRA*CA14 / CA1<23.66° is satisfied, the incident angle requirement of the image sensor is met and the goal of miniaturized module is achieved.

[0024] When -34.87<R4 / R2<-1 is satisfied, a larger amount of incident light can be obtained by properly configuring the curvature radii of the second lens and the first lens.

[0025] When 0.88<(R3+R4) / (R8+R9)<3.9 is satisfied, a larger amount of incident light can be obtained by properly configuring the curvature radii of the second lens, the fourth lens, and the fifth lens.

[0026] When 1.67<HFOV / CRA<2.69 is satisfied, the wide angle requirement is achieved and the incident angle requirement of the image sensor is satisfied.

[0027] When 0.57<(T34+T45) / CT4<1.8 is satisfied, the goal of miniaturization of the module is achieved by means of the air space between the third lens and the fourth lens, the air space between the fourth lens and the fifth lens, and the lens thickness of the fourth lens.

[0028] When -330.49mm is met 2 <EPD*(R3+R4)<-3.21mm 2 By matching the appropriate curvature, a larger amount of light can be input.

[0029] When -3.91 mm<(R3 / R14)*CT6<-0.48 mm, the aberration can be corrected by properly configuring the curvature radius between the second lens and the seventh lens and matching the lens thickness of the sixth lens.

[0030] When -34.6°<HFOV*BFL / R4<-0.69° is satisfied, the goals of wide-angle and miniaturized module are achieved.

[0031] When 0.14<R3*TL / (R4*IMH)<3.22 is satisfied, a larger imaging range can be obtained while maintaining the goal of miniaturization of the module.

[0032] When 107.2°<HFOV*CA1 / CA14<201.35° is satisfied, the goals of wide angle and miniaturized module are achieved.

[0033] When -26.61<R11*T56 / (R4*T23)<-0.14 is satisfied, the combination of appropriate curvature and air space is conducive to correcting aberrations.

[0034] When 1.14<CA1 / IMH<1.85 is satisfied, a larger imaging range can be obtained.

[0035] When 0.62<CT2 / EPD<1.66 is satisfied, a larger amount of incident light is obtained.

[0036] In addition, the present invention also provides a camera module according to an embodiment, comprising: a lens barrel; the above-mentioned imaging lens group, which is arranged in the lens barrel; and an image sensor, which is arranged on the imaging surface of the imaging lens group. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Other aspects and advantages of the present invention will be discovered after studying the detailed description in conjunction with the following drawings:

[0038] Figure 1A FIG. 4 is a schematic diagram of an imaging lens assembly according to a first embodiment of the present invention.

[0039] Figure 1B From left to right are the field curvature and distortion curves of the imaging lens assembly of the first embodiment.

[0040] Figure 2A FIG. 4 is a schematic diagram of an imaging lens assembly according to a second embodiment of the present invention.

[0041] Figure 2B From left to right are the field curvature and distortion curves of the imaging lens assembly of the second embodiment.

[0042] Figure 3A FIG. 4 is a schematic diagram of an imaging lens assembly according to a third embodiment of the present invention.

[0043] Figure 3B From left to right are the field curvature and distortion curves of the imaging lens assembly of the third embodiment.

[0044] Figure 4AFIG. 4 is a schematic diagram of an imaging lens assembly according to a fourth embodiment of the present invention.

[0045] Figure 4B From left to right are the field curvature and distortion curves of the imaging lens assembly of the fourth embodiment.

[0046] Figure 5A FIG. 4 is a schematic diagram of an imaging lens assembly according to a fifth embodiment of the present invention.

[0047] Figure 5B From left to right are the field curvature and distortion curves of the imaging lens assembly of the fifth embodiment.

[0048] Fig. 6A FIG. 4 is a schematic diagram of an imaging lens assembly according to a sixth embodiment of the present invention.

[0049] Figure 6B From left to right are the field curvature and distortion curves of the imaging lens assembly of the sixth embodiment.

[0050] Figure 7 Schematic diagram of a camera module according to the seventh embodiment of the present invention.

[0051] Description of Figure Numbers

[0052] 100, 200, 300, 400, 500, 600: light bar

[0053] 110, 210, 310, 410, 510, 610: First lens

[0054] 111, 211, 311, 411, 511, 611: Object side surface

[0055] 112, 212, 312, 412, 512, 612: Image side surface

[0056] 120, 220, 320, 420, 520, 620: Second lens

[0057] 121, 221, 321, 421, 521, 621: Object side surface

[0058] 122, 222, 322, 422, 522, 622: Image side surface

[0059] 130, 230, 330, 430, 530, 630: Third lens

[0060] 131, 231, 331, 431, 531, 631: Object side surface

[0061] 132, 232, 332, 432, 532, 632: Image side surface

[0062] 140, 240, 340, 440, 540, 640: Fourth lens

[0063] 141, 241, 341, 441, 541, 641: Object side surface

[0064] 142, 242, 342, 442, 542, 642: Image side surface

[0065] 150, 250, 350, 450, 550, 650: Fifth lens

[0066] 151, 251, 351, 451, 551, 651: Object side surface

[0067] 152, 252, 352, 452, 552, 652: Image side surface

[0068] 160, 260, 360, 460, 560, 660: Sixth lens

[0069] 161, 261, 361, 461, 561, 661: Object side surface

[0070] 162, 262, 362, 462, 562, 662: Image side surface

[0071] 170, 270, 370, 470, 570, 670: seventh lens

[0072] 171, 271, 371, 471, 571, 671: Object side surface

[0073] 172, 272, 372, 472, 572, 672: Image side surface

[0074] 181, 281, 381, 481, 581, 681: filter elements

[0075] 182, 282, 382, ​​482, 582, 682: Imaging surface

[0076] 183, 283, 383, 483, 583, 683: Image sensors

[0077] 190, 290, 390, 490, 590, 690: optical axis

[0078] 10: Camera module

[0079] 11: Lens barrel

[0080] 12: Imaging lens group

[0081] 121: Imaging surface

[0082] 13: Image sensor

[0083] f: overall focal length of the imaging lens group

[0084] FOV: Maximum field of view in the imaging lens group

[0085] EPD: Entrance pupil diameter of the imaging lens group

[0086] TL: The distance from the object side surface of the first lens to the imaging surface on the optical axis

[0087] BFL: The distance from the image side surface of the seventh lens to the imaging plane on the optical axis

[0088] IMH: Maximum imaging height of the imaging lens group

[0089] CRA: The angle of the principal ray incident on the imaging surface at the maximum viewing angle of the imaging lens group

[0090] CA1: Maximum effective radius of the object side surface of the first lens

[0091] CA14: Maximum effective radius of the image side surface of the seventh lens

[0092] R2: The radius of curvature of the image-side surface of the first lens

[0093] R3: The radius of curvature of the object side surface of the second lens

[0094] R4: The radius of curvature of the image-side surface of the second lens

[0095] R8: The curvature radius of the image-side surface of the fourth lens

[0096] R9: The radius of curvature of the object-side surface of the fifth lens

[0097] R11: The radius of curvature of the object-side surface of the sixth lens

[0098] R14: Radius of curvature of the image-side surface of the seventh lens

[0099] FOV: The maximum viewing angle of the imaging lens group

[0100] HFOV: half of the maximum viewing angle of the imaging lens group

[0101] T23: The distance between the second lens and the third lens on the optical axis

[0102] T34: The distance between the third lens and the fourth lens on the optical axis

[0103] T45: The distance between the fourth lens and the fifth lens on the optical axis

[0104] T56: The distance between the fifth lens and the sixth lens on the optical axis

[0105] CT2: The thickness of the second lens on the optical axis

[0106] CT4: The thickness of the fourth lens on the optical axis

[0107] CT6: The thickness of the sixth lens on the optical axis

[0108] EPD: Entrance pupil diameter of the imaging lens group

[0109] BFL: The distance from the image side surface of the seventh lens to the imaging plane on the optical axis

[0110] TL: The distance from the object side surface of the first lens to the imaging surface on the optical axis

[0111] IMH: Maximum imaging height of the imaging lens group DETAILED DESCRIPTION

[0112] <First Embodiment>

[0113] Please refer to Figure 1A and Figure 1B ,in Figure 1A FIG. 1 is a schematic diagram of an imaging lens assembly according to a first embodiment of the present invention. Figure 1B From left to right are the field curvature and distortion curves of the imaging lens assembly of the first embodiment. Figure 1A It can be seen that the imaging lens group includes a first lens 110, a second lens 120, a third lens 130, a light barrier 100, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, a filter element 181, and an imaging surface 182 in order from the object side to the image side along the optical axis 190, and the imaging lens group is used with an image sensor 183. The number of lenses with refractive power in the imaging lens group is seven, but not limited thereto. The image sensor 183 is disposed on the imaging surface 182.

[0114] The first lens 110 has 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 .

[0115] The second lens 120 has negative refractive power and is made of plastic. Its object-side surface 121 is concave near the optical axis 190 , and its image-side surface 122 is convex near the optical axis 190 . Both the object-side surface 121 and the image-side surface 122 are aspherical.

[0116] 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 .

[0117] 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.

[0118] The fifth lens 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.

[0119] The sixth lens 160 has positive refractive power and is made of glass. 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.

[0120] The seventh lens element 170 has negative 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.

[0121] The filter 181 is made of glass and is disposed between the seventh lens 170 and the imaging surface 182 without affecting the focal length of the imaging lens group. In this embodiment, the filter 181 is an IR-cut filter that allows visible light to pass through.

[0122] The curve equations of the aspheric surfaces of the above lenses are expressed as follows:

[0123]

[0124] Wherein z is the position value at a height of h along the optical axis 190 with the surface vertex as a reference; c is the curvature of the lens surface close to 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 close to 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.

[0125] In 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 (angle of view) 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=4.31 (mm); Fno=2.66; FOV=150.05 (degrees); and EPD=1.62 (mm).

[0126] In the imaging lens group of the first embodiment, the angle of the maximum viewing angle of the imaging lens group at which the principal ray is incident on the imaging plane is CRA, the maximum effective radius of the object side surface 111 of the first lens 110 is CA1, the maximum effective radius of the image side surface 172 of the seventh lens 170 is CA14, and the following condition is satisfied: CRA*CA14 / CA1=19.46°.

[0127] In the imaging lens group of the first embodiment, the curvature radius R2 of the image side surface 112 of the first lens 110 and the curvature radius R4 of the image side surface 122 of the second lens 120 satisfy the following condition: R4 / R2=-1.45.

[0128] In the imaging lens group of the first embodiment, the curvature radius R3 of the object side surface 121 of the second lens 120, the curvature radius R4 of the image side surface 122 of the second lens 120, the curvature radius R8 of the image side surface 142 of the fourth lens 140, and the curvature radius R9 of the object side surface 151 of the fifth lens 150 satisfy the following condition: (R3+R4) / (R8+R9)=1.10.

[0129] In the imaging lens group of the first embodiment, half of the maximum viewing angle of the imaging lens group is HFOV, the angle of the maximum viewing angle principal ray of the imaging lens group incident on the imaging surface 182 is CRA, and the following condition is satisfied: HFOV / CRA=2.16.

[0130] In the imaging lens group of the first embodiment, the spacing distance between the third lens 130 and the fourth lens 140 on the optical axis 190 is T34, the spacing distance between the fourth lens 140 and the fifth lens 150 on the optical axis 190 is T45, the thickness of the fourth lens 140 on the optical axis 190 is CT4, and the following condition is satisfied: (T34+T45) / CT4=1.45.

[0131] In the imaging lens group of the first embodiment, the entrance pupil diameter of the imaging lens group is EPD, the curvature radius of the object side surface 121 of the second lens 120 is R3, the curvature radius of the image side surface 122 of the second lens 120 is R4, and the following condition is satisfied: EPD*(R3+R4)=-22.04mm 2 .

[0132] In the imaging lens group of the first embodiment, the curvature radius R3 of the object side surface 121 of the second lens 120, the curvature radius R14 of the image side surface 172 of the seventh lens 170, and the thickness CT6 of the sixth lens 160 on the optical axis 190 satisfy the following condition: (R3 / R14)*CT6=-2.67mm.

[0133] In the imaging lens group of the first embodiment, half of the maximum viewing angle in the imaging lens group is HFOV, the distance from the image side surface 172 of the seventh lens 170 to the imaging surface 182 on the optical axis 190 is BFL, the curvature radius of the image side surface of the second lens is R4, and the following condition is satisfied: HFOV*BFL / R4=-14.07°.

[0134] In the imaging lens group of the first embodiment, the curvature radius of the object-side surface of the second lens is R3, the curvature radius of the image-side surface of the second lens is R4, the distance from the object-side surface of the first lens to the imaging plane on the optical axis is TL, the maximum imaging height of the imaging lens group is IMH, and the following condition is satisfied: R3*TL / (R4*IMH)=2.44.

[0135] In the imaging lens group of the first embodiment, half of the maximum viewing angle in the imaging lens group is HFOV, the maximum effective radius of the object side surface of the first lens is CA1, the maximum effective radius of the image side surface of the seventh lens is CA14, and the following condition is satisfied: HFOV*CA1 / CA14=134.00°.

[0136] In the imaging lens group of the first embodiment, the curvature radius of the image-side surface of the second lens is R4, the curvature radius of the object-side surface of the sixth lens is R11, the spacing distance between the second lens and the third lens on the optical axis is T23, the spacing distance between the fifth lens and the sixth lens on the optical axis is T56, and the following condition is satisfied: R11*T56 / (R4*T23)=-5.94.

[0137] In the imaging lens group of the first embodiment, the maximum effective radius of the object side surface of the first lens is CA1, the maximum imaging height of the imaging lens group is IMH, and the following condition is satisfied: CA1 / IMH=1.42.

[0138] In the imaging lens assembly of the first embodiment, the thickness of the second lens on the optical axis is CT2, the entrance pupil diameter of the imaging lens assembly is EPD, and the following condition is satisfied: CT2 / EPD=0.78.

[0139] Please refer to Table 1, Table 2 and Table 3 below.

[0140]

[0141]

[0142]

[0143] Table 1 Figure 1ADetailed structural data of the first embodiment, wherein the units of the curvature radius, thickness, gap and focal length are mm, and surfaces 0-18 represent the surfaces from the object side to the image side in sequence, wherein surface 0 is the gap between the object and the first lens 110 on the optical axis 190; surface 1 is the thickness of the first lens 110 on the optical axis 190; surface 2 is the gap between the first lens 110 and the second lens 120 on the optical axis 190; surface 3 is the thickness of the second lens 120 on the optical axis 190; surface 4 is the gap between the second lens 120 and the third lens 130 on the optical axis 190; surface 5 is the thickness of the third lens 130 on the optical axis 190; surface 6 is the gap between the third lens 130 and the light bar 100 on the optical axis 190; surface 7 is the gap between the light bar 100 and the fourth lens 140 on the optical axis 190; surface 8 is the thickness of the fourth lens 120 on the optical axis 190; surface 9 is the gap between the third lens 130 and the light bar 100 on the optical axis 190; surface 10 is the gap between the fourth lens 140 and the light bar 100 on the optical axis 190; surface 11 is the gap between the fourth lens 140 and the light bar 100 on the optical axis 190; surface 12 is the gap between the fourth lens 140 and the light bar 100 on the optical axis 190; surface 13 is the gap between the fourth lens 140 and the light bar 100 on the optical axis 190; surface 14 is the gap between the fourth lens 140 and the light bar 100 on the optical axis 190; surface 15 is the gap between the fourth lens 140 and the light bar 100 on the optical axis The thickness of the lens 140 on the optical axis 190; the surface 9 is the gap between the fourth lens 140 and the fifth lens 150 on the optical axis 190; the surface 10 is the thickness of the fifth lens 150 on the optical axis 190; the surface 11 is the gap between the fifth lens 150 and the sixth lens 160 on the optical axis 190; the surface 12 is the thickness of the sixth lens 160 on the optical axis 190; the surface 13 is the gap between the sixth lens 160 and the seventh lens 170 on the optical axis 190; the surface 14 is the thickness of the seventh lens 170 on the optical axis 190; the surface 15 is the gap between the seventh lens 170 and the filter element 181 on the optical axis 190; the surface 16 is the thickness of the filter element 181 on the optical axis 190; the surface 17 is the gap between the filter element 181 and the imaging surface 182 on the optical axis 190; and the surface 18 is the imaging surface 183.

[0144] Table 2 is the aspheric surface data in the first embodiment, wherein k is the cone coefficient in the aspheric curve equation, and A2, A4, A6, A8, A10, A12, A14, A16, A18, A20, and A22 are high-order aspheric surface coefficients. In addition, the following tables of the embodiments correspond to the schematic diagrams and image plane curvature curve diagrams of the embodiments, and the definitions of the data in the tables are the same as those in Tables 1, 2, and 3 of the first embodiment, and are not repeated here.

[0145] <Second Embodiment>

[0146] Please refer to Figure 2A and Figure 2B ,in Figure 2A FIG. 1 is a schematic diagram of an imaging lens assembly according to a second embodiment of the present invention. Figure 2B From left to right are the field curvature and distortion curves of the imaging lens assembly of the second embodiment. Figure 2AIt can be seen that the imaging lens group includes a first lens 210, a second lens 220, a third lens 230, a light barrier 200, a fourth lens 240, a fifth lens 250, a sixth lens 260, a seventh lens 270, a filter element 281, and an imaging surface 282 in order from the object side to the image side along the optical axis 290, and the imaging lens group is used with an image sensor 283. The number of lenses with refractive power in the imaging lens group is seven, but not limited thereto. The image sensor 283 is disposed on the imaging surface 282.

[0147] The first lens 210 has negative refractive power and is made of glass. Its object-side surface 211 is convex near the optical axis 290 , and its image-side surface 212 is concave near the optical axis 290 .

[0148] The second lens 220 has negative refractive power and is made of plastic. Its object-side surface 221 is concave near the optical axis 290 , and its image-side surface 222 is convex near the optical axis 290 . Both the object-side surface 221 and the image-side surface 222 are aspherical.

[0149] 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 .

[0150] 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.

[0151] 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.

[0152] 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.

[0153] The seventh lens element 270 has negative 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.

[0154] The filter 281 is made of glass and is disposed between the seventh lens 270 and the imaging surface 282 without affecting the focal length of the imaging lens group. In this embodiment, the filter 281 is an IR-cut filter that allows visible light to pass through.

[0155] Please refer to Table 4, Table 5 and Table 6 below.

[0156]

[0157]

[0158]

[0159]

[0160] 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.

[0161] The following data can be calculated by combining Tables 4 to 6:

[0162]

[0163] <Third Embodiment>

[0164] Please refer to Figure 3A and Figure 3B ,in Figure 3A FIG. 1 is a schematic diagram of an imaging lens assembly according to a third embodiment of the present invention. Figure 3B From left to right are the field curvature and distortion curves of the imaging lens assembly of the third embodiment. Figure 3A It can be seen that the imaging lens group includes a first lens 310, a second lens 320, a third lens 330, a light barrier 300, a fourth lens 340, a fifth lens 350, a sixth lens 360, a seventh lens 370, a filter element 381, and an imaging surface 382 in order from the object side to the image side along the optical axis 390, and the imaging lens group is used with an image sensor 383. The number of lenses with refractive power in the imaging lens group is seven, but not limited thereto. The image sensor 383 is disposed on the imaging surface 382.

[0165] 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 .

[0166] The second lens 320 has negative 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.

[0167] The third lens 330 has positive refractive power and is made of glass. Its object-side surface 331 is convex near the optical axis 390 , and its image-side surface 332 is concave near the optical axis 390 . Both the object-side surface 331 and the image-side surface 332 are aspherical.

[0168] 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.

[0169] The fifth lens 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 convex near the optical axis 390 . Both the object-side surface 351 and the image-side surface 352 are aspherical.

[0170] 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.

[0171] The seventh lens element 370 has negative 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.

[0172] The filter 381 is made of glass and is disposed between the seventh lens 370 and the imaging surface 382 without affecting the focal length of the imaging lens group. In this embodiment, the filter 381 is an IR-cut filter that allows visible light to pass through.

[0173] Please refer to Table 8, Table 9 and Table 10 below.

[0174]

[0175]

[0176]

[0177]

[0178]

[0179] 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.

[0180] The following data can be calculated by combining Tables 8 to 10:

[0181]

[0182] <Fourth Embodiment>

[0183] Please refer to Figure 4A and Figure 4B ,in Figure 4A FIG. 4 is a schematic diagram showing an imaging lens assembly according to a fourth embodiment of the present invention. Figure 4B From left to right are the field curvature and distortion curves of the imaging lens assembly of the fourth embodiment. Figure 4A It can be seen that the imaging lens group includes a first lens 410, a second lens 420, a third lens 430, a light barrier 400, a fourth lens 440, a fifth lens 450, a sixth lens 460, a seventh lens 470, a filter element 481, and an imaging surface 482 in order from the object side to the image side along the optical axis 490, and the imaging lens group is used with an image sensor 483. The number of lenses with refractive power in the imaging lens group is seven, but not limited thereto. The image sensor 483 is disposed on the imaging surface 482.

[0184] 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 .

[0185] The second lens 420 has negative 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 . Both the object side surface 421 and the image side surface 422 are aspherical.

[0186] The third lens 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 . Both the object-side surface 431 and the image-side surface 432 are aspherical.

[0187] 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.

[0188] 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 convex near the optical axis 490 . Both the object-side surface 451 and the image-side surface 452 are aspherical.

[0189] 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.

[0190] The seventh lens element 470 has negative 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.

[0191] The filter element 481 is made of glass, and is disposed between the seventh lens 470 and the imaging surface 482 without affecting the focal length of the imaging lens group. In this embodiment, the filter element 481 is an infrared filter element (IR-cut Filter) that allows visible light bands to pass through.

[0192] Please refer to Table 12, Table 13 and Table 14 below.

[0193]

[0194]

[0195]

[0196] 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.

[0197] The following data can be calculated by combining Tables 12 to 14:

[0198]

[0199]

[0200] <Fifth Embodiment>

[0201] Please refer to Figure 5A and Figure 5B ,in Figure 5A FIG. 4 is a schematic diagram showing an imaging lens assembly according to a fifth embodiment of the present invention. Figure 5B From left to right are the field curvature and distortion curves of the imaging lens assembly of the fifth embodiment. Figure 5AIt can be seen that the imaging lens group includes a first lens 510, a second lens 520, a third lens 530, a light barrier 500, a fourth lens 540, a fifth lens 550, a sixth lens 560, a seventh lens 570, a filter element 581, and an imaging surface 582 in order from the object side to the image side along the optical axis 590, and the imaging lens group is used with an image sensor 583. The number of lenses with refractive power in the imaging lens group is seven, but not limited thereto. The image sensor 583 is disposed on the imaging surface 582.

[0202] 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 .

[0203] The second lens 520 has negative 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 . Both the object-side surface 521 and the image-side surface 522 are aspherical.

[0204] 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 concave near the optical axis 590 . Both the object-side surface 531 and the image-side surface 532 are aspherical.

[0205] 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.

[0206] 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 convex near the optical axis 590 . Both the object-side surface 551 and the image-side surface 552 are aspherical.

[0207] 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.

[0208] The seventh lens element 570 has negative 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.

[0209] The filter 581 is made of glass, and is disposed between the seventh lens 570 and the imaging surface 582 without affecting the focal length of the imaging lens group. In this embodiment, the filter 581 is an infrared filter (IR-cut Filter) that allows visible light to pass through.

[0210] Please refer to Table 16, Table 17 and Table 18 below.

[0211]

[0212]

[0213]

[0214]

[0215] 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.

[0216] The following data can be calculated by combining Tables 16 to 18:

[0217]

[0218] <Sixth Embodiment>

[0219] Please refer to Fig. 6A and Figure 6B ,in Fig. 6A FIG. 4 is a schematic diagram showing an imaging lens assembly according to a sixth embodiment of the present invention. Figure 6B From left to right are the field curvature and distortion curves of the imaging lens assembly of the sixth embodiment. Fig. 6A It can be seen that the imaging lens group includes a first lens 610, a second lens 620, a third lens 630, a light barrier 600, a fourth lens 640, a fifth lens 650, a sixth lens 660, a seventh lens 670, a filter element 681, and an imaging surface 682 in order from the object side to the image side along the optical axis 690, and the imaging lens group is used with an image sensor 683. The number of lenses with refractive power in the imaging lens group is seven, but not limited thereto. The image sensor 683 is disposed on the imaging surface 682.

[0220] 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 .

[0221] The second lens 620 has negative 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 . Both the object-side surface 621 and the image-side surface 622 are aspherical.

[0222] 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 . Both the object-side surface 631 and the image-side surface 632 are aspherical.

[0223] 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.

[0224] 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 convex near the optical axis 690 . Both the object-side surface 651 and the image-side surface 652 are aspherical.

[0225] 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.

[0226] The seventh lens element 670 has negative 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.

[0227] The filter element 681 is made of glass, and is disposed between the seventh lens 670 and the imaging surface 682 without affecting the focal length of the imaging lens group. In this embodiment, the filter element 681 is an infrared filter element (IR-cut Filter) that allows visible light bands to pass through.

[0228] Please refer to Table 20, Table 21 and Table 22 below.

[0229]

[0230]

[0231]

[0232]

[0233]

[0234] 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 those in the first embodiment and are not repeated here.

[0235] The following data can be calculated by combining Tables 20 to 22:

[0236]

[0237] <Seventh Embodiment>

[0238] Please refer to Figure 7 , depicts a camera module according to a seventh embodiment of the present invention. The camera module 10 includes a lens barrel 11, an imaging lens group 12, and an image sensor 13. The imaging lens group 12 is the imaging lens group of the above-mentioned embodiments, and the imaging lens group 12 is disposed in the lens barrel 11. The image sensor 13 is disposed on the imaging surface 121 of the imaging lens group 12, and is an electronic photosensitive element (such as CMOS, CCD) with good sensitivity and low noise, so as to truly present the imaging quality of the imaging lens group.

[0239] The imaging lens set provided by the present invention can be made of plastic or glass. When the lens is made of plastic, the production cost can be effectively reduced. When the lens is made of glass, the freedom of refractive power configuration of the imaging lens set can be increased. In addition, the object side surface and the image side surface of the lens in the imaging lens set can be aspherical surfaces. The aspherical surface can be easily made into a shape other than a spherical surface, thereby obtaining more control variables to reduce aberrations and further reduce the number of lenses used, thereby effectively reducing the total length of the imaging lens set of the present invention.

[0240] In the imaging lens assembly provided by the present invention, the filter element is made of glass, but is not limited thereto and may also be made of other materials with high dispersion coefficient.

[0241] In the imaging lens group provided by the present invention, with respect to the 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.

[0242] The imaging lens assembly provided by the present invention can be applied to an optical system with mobile focus according to visual requirements, 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, wearable displays of virtual reality (VR) or augmented reality (AR), game consoles, monitor camera lenses, digital cameras, mobile devices, digital tablets, sports cameras, drone lenses, home electronic devices or car photography.

Claims

1. An imaging lens assembly, characterized in that: From the object side to the image side, it includes: a first lens having negative refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens element having positive refractive power; a fifth lens element having negative refractive power; a sixth lens element having positive refractive power; and a seventh lens element having negative refractive power; The angle of the main light of the maximum viewing angle of the imaging lens group incident on the imaging surface is CRA, the maximum effective radius of the object side surface of the first lens is CA1, the maximum effective radius of the image side surface of the seventh lens is CA14, and the following conditions are satisfied: 14.42°<CRA*CA14 / CA1<23.66°.

2. The imaging lens assembly according to claim 1, characterized in that: The curvature radius of the image side surface of the first lens is R2, the curvature radius of the image side surface of the second lens is R4, and the following condition is satisfied: -34.87<R4 / R2<-1.

3. The imaging lens assembly according to claim 1, characterized in that: The curvature radius of the object side surface of the second lens is R3, the curvature radius of the image side surface of the second lens is R4, the curvature radius of the image side surface of the fourth lens is R8, and the curvature radius of the object side surface of the fifth lens is R9, and the following condition is satisfied: 0.88<(R3+R4) / (R8+R9)<3.

9.

4. The imaging lens assembly according to claim 1, characterized in that: Half of the maximum viewing angle of the imaging lens group is HFOV, the angle of the maximum viewing angle principal ray of the imaging lens group incident on the imaging surface is CRA, and the following condition is satisfied: 1.67<HFOV / CRA<2.

69.

5. The imaging lens assembly according to claim 1, characterized in that: The distance between the third lens and the fourth lens on the optical axis is T34, the distance between the fourth lens and the fifth lens on the optical axis is T45, the thickness of the fourth lens on the optical axis is CT4, and the following condition is satisfied: 0.57<(T34+T45) / CT4<1.

8.

6. The imaging lens assembly according to claim 1, characterized in that: The incident pupil diameter of the imaging lens group is EPD, the curvature radius of the object side surface of the second lens is R3, the curvature radius of the image side surface of the second lens is R4, and the following conditions are met: -330.49 mm 2 <EPD*(R3+R4)<-3.21mm 2 .

7. The imaging lens assembly according to claim 1, characterized in that: The curvature radius of the object side surface of the second lens is R3, the curvature radius of the image side surface of the seventh lens is R14, the thickness of the sixth lens on the optical axis is CT6, and the following condition is satisfied: -3.91mm<(R3 / R14)*CT6<-0.48mm.

8. The imaging lens assembly according to claim 1, characterized in that: Half of the maximum viewing angle in the imaging lens group is HFOV, the distance from the image side surface of the seventh lens to the imaging plane on the optical axis is BFL, the curvature radius of the image side surface of the second lens is R4, and the following conditions are satisfied: -34.6°<HFOV*BFL / R4<-0.69°.

9. The imaging lens assembly according to claim 1, characterized in that: The curvature radius of the object side surface of the second lens is R3, the curvature radius of the image side surface of the second lens is R4, the distance from the object side surface of the first lens to the imaging plane on the optical axis is TL, the maximum imaging height of the imaging lens group is IMH, and the following conditions are satisfied: 0.14<R3*TL / (R4*IMH)<3.

22.

10. The imaging lens assembly according to claim 1, characterized in that: Half of the maximum viewing angle in the imaging lens group is HFOV, the maximum effective radius of the object side surface of the first lens is CA1, the maximum effective radius of the image side surface of the seventh lens is CA14, and the following conditions are satisfied: 107.2°<HFOV*CA1 / CA14<201.35°.

11. The imaging lens assembly according to claim 1, characterized in that: The curvature radius of the image side surface of the second lens is R4, the curvature radius of the object side surface of the sixth lens is R11, the spacing distance between the second lens and the third lens on the optical axis is T23, the spacing distance between the fifth lens and the sixth lens on the optical axis is T56, and the following condition is satisfied: -26.61<R11*T56 / (R4*T23)<-0.

14.

12. The imaging lens assembly according to claim 1, characterized in that: The maximum effective radius of the object side surface of the first lens is CA1, the maximum imaging height of the imaging lens group is IMH, and the following condition is satisfied: 1.14<CA1 / IMH<1.

85.

13. The imaging lens assembly according to claim 1, characterized in that: The thickness of the second lens on the optical axis is CT2, the incident pupil diameter of the imaging lens group is EPD, and the following condition is satisfied: 0.62<CT2 / EPD<1.

66.

14. A camera module, characterized in that: Include: A lens tube; An imaging lens assembly as claimed in any one of claims 1 to 13, arranged in the lens barrel; and An image sensor is disposed on the imaging surface of the imaging lens group.

Images