Imaging lens group and camera module

Abstract

The invention relates to 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; and a sixth lens element with positive refractive power, wherein the distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, the angle of the imaging lens group, which is incident to the imaging surface, of the main light of the maximum visual angle is CRA, the overall focal length of the imaging lens group is f, and the following condition is satisfied: TL * CRA / f is more than 51.73 degrees and less than 129.65 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) or drone lenses. 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 six lenses with refractive power. When certain conditions are met, the imaging lens group provided by the present invention can have high-resolution imaging quality in both the visible light band and the infrared light band, and has 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; and a sixth lens having positive refractive power.

[0006] In an imaging lens group, the overall focal length of the imaging lens group is f, the maximum field of view angle in the imaging lens group is FOV, the entrance pupil diameter of the imaging lens group is EPD, the distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, the angle of the maximum viewing angle principal ray of the imaging lens group incident on the imaging surface is CRA, the distance from the image side surface of the sixth lens to the imaging surface on the optical axis is BFL, the maximum imaging height of the imaging lens group is IMH, 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, the curvature radius of the image side surface of the fourth lens is R8, the second lens and the third lens are The distance between the third lens and the fourth 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 third lens on the optical axis is CT3, the thickness of the fourth lens on the optical axis is CT4, the thickness of the fifth lens on the optical axis is CT5, the thickness of the sixth lens on the optical axis is CT6, the combined focal length of the fourth lens, the fifth lens and the sixth lens is f456, and at least one of the following conditions is satisfied:

[0007] 51.73°<TL*CRA / f<129.65°;

[0008] 7.40°<(CRA*BFL) / (T23+T34)<16.88°;

[0009] 42.02mm<(BFL*TL) / EPD<74.86mm;

[0010] 9.08° / mm 2 <FOV / (TL*f)<17.63° / mm 2 ;

[0011] -1 8.20mm 2 <(CT4+T45+CT5+T56+CT6+BFL)*R8<-7.67mm 2 ;

[0012] 14.25mm<TL*R2 / f<39.32mm;

[0013] -242.64mm 3 <(CT4+T45+CT5+T56+CT6+BFL)*R8*TL<-93.56mm 3 ;

[0014] 33.13mm<TL*CT3 / IMH<69.96mm:

[0015] 0.31mm -2 <|(f456) / (R2*R4*R8)|<0.70mm -2 ;

[0016] 8.38mm-deg.<(CT2+CT3)*CRA<25.30mm-deg.;

[0017] 19.22<FOV / CRA<34.21; and

[0018] 1.12<IMH / f<2.22.

[0019] When 51.73°<TL*CRA / f<129.65° is satisfied, a shorter imaging lens set height can be achieved and better imaging quality can be provided by properly configuring the principal ray incident angle and the overall focal length of the imaging lens set.

[0020] When 7.40°<(CRA*BFL) / (T23+T34)<16.88° is satisfied, the optimal imaging lens group height and imaging size requirements can be achieved by properly configuring the main light incident angle, back focal length and lens spacing distance of the imaging lens group.

[0021] When 42.02 mm<(BFL*TL) / EPD<74.86 mm is satisfied, by properly configuring the back focal length and entrance pupil diameter of the imaging lens group, a shorter height imaging lens group can be required and better imaging quality can be provided.

[0022] When 9.08° / mm is met 2 <FOV / (TL*f)<17.63° / mm 2 By properly configuring the overall focal length and the height of the imaging lens group, the imaging lens group can be miniaturized and provide a larger viewing angle.

[0023] When -18.20mm is met 2 <(CT4+T45+CT5+T56+CT6+BFL)*R8<-7.67mm 2 When the imaging lens group is used, the ghosting problem of the imaging lens group can be reduced by properly configuring the lens thickness, lens spacing distance and lens curvature radius of the imaging lens group.

[0024] When 14.25 mm<TL*R2 / f<39.32 mm is satisfied, the imaging lens group can have a larger viewing angle by properly setting the height of the imaging lens group, the lens curvature radius and the overall focal length.

[0025] When -242.64mm is met 3<(CT4+T45+CT5+T56+CT6+BFL)*R8*TL<-93.56mm 3 When the imaging lens group is used, the ghosting problem of the imaging lens group can be reduced by properly configuring the lens thickness, lens spacing distance and lens curvature radius of the imaging lens group.

[0026] When 33.13 mm<TL*CT3 / IMH<69.96 mm is satisfied, the imaging size requirement can be met by properly configuring the height of the imaging lens group, the lens thickness and the maximum imaging height.

[0027] When 0.31mm is met -2 <|(f456) / (R2*R4*R8)|<0.70mm -2 When the focal length of the fourth to sixth lenses in the imaging lens group and the lens curvature radius are properly configured, the confocality of the visible light and infrared light bands can be met.

[0028] When 8.38 mm-deg.<(CT2+CT3)*CRA<25.30 mm-deg. is satisfied, the imaging quality of the imaging lens group can be improved by properly configuring the lens thickness of the imaging lens group and the incident angle of the main light.

[0029] When 19.22<FOV / CRA<34.21 is satisfied, the imaging lens group can be miniaturized and a larger viewing angle can be provided by properly configuring the maximum viewing angle of the imaging lens group and the incident angle of the principal ray.

[0030] When 1.12<IMH / f<2.22 is satisfied, the maximum imaging height and the overall focal length of the imaging lens group can be appropriately configured to meet the needs of image sensors with larger sizes.

[0031] 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

[0032] Other aspects and advantages of the present invention will be discovered after studying the detailed description in conjunction with the following drawings:

[0033] Figure 1A It is a schematic diagram of an imaging lens assembly according to a first embodiment of the present invention.

[0034] Figure 1B From left to right are the field curvature and distortion curves of the imaging lens set of the first embodiment, showing the field curvature and distortion states of the imaging lens set in the visible light and infrared light bands.

[0035] Figure 1CIt is a schematic diagram showing the parameter CRA in the first embodiment of the present invention.

[0036] Figure 2A A schematic diagram of an imaging lens assembly according to a second embodiment of the present invention is shown.

[0037] Figure 2B From left to right are the field curvature and distortion curves of the imaging lens set of the second embodiment, showing the field curvature and distortion states of the imaging lens set in the visible light and infrared light bands.

[0038] Figure 3A It is a schematic diagram of an imaging lens assembly according to a third embodiment of the present invention.

[0039] Figure 3B From left to right are the field curvature and distortion curves of the imaging lens set of the third embodiment, showing the field curvature and distortion states of the imaging lens set in the visible light and infrared light bands.

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

[0041] Figure 4B From left to right are the field curvature and distortion curves of the imaging lens set of the fourth embodiment, showing the field curvature and distortion states of the imaging lens set in the visible light and infrared light bands.

[0042] Figure 5A A schematic diagram of an imaging lens assembly according to a fifth embodiment of the present invention is shown.

[0043] Figure 5B From left to right are the field curvature and distortion curves of the imaging lens set of the fifth embodiment, showing the field curvature and distortion states of the imaging lens set in the visible light and infrared light bands.

[0044] Figure 6 Shown is a schematic diagram of a camera module according to a sixth embodiment of the present invention.

[0045] Description of Figure Numbers

[0046] 100, 200, 300, 400, 500: light bar

[0047] 110, 210, 310, 410, 510: First lens

[0048] 111, 211, 311, 411, 511: Object side surface

[0049] 112, 212, 312, 412, 512: Image side surface

[0050] 120, 220, 320, 420, 520: Second lens

[0051] 121, 221, 321, 421, 521: Object side surface

[0052] 122, 222, 322, 422, 522: Image side surface

[0053] 130, 230, 330, 430, 530: The third lens

[0054] 131, 231, 331, 431, 531: Object side surface

[0055] 132, 232, 332, 432, 532: Image side surface

[0056] 140, 240, 340, 440, 540: The fourth lens

[0057] 141, 241, 341, 441, 541: Object side surface

[0058] 142, 242, 342, 442, 542: Image side surface

[0059] 150, 250, 350, 450, 550: Fifth lens

[0060] 151, 251, 351, 451, 551: Object side surface

[0061] 152, 252, 352, 452, 552: Image side surface

[0062] 160, 260, 360, 460, 560: Sixth lens

[0063] 161, 261, 361, 461, 561: Object side surface

[0064] 162, 262, 362, 462, 562: Image side surface

[0065] 170, 270, 370, 470, 570: filter elements

[0066] 181, 281, 381, 481, 581: Protective glass

[0067] 182, 282, 382, ​​482, 582: Imaging surface

[0068] 183, 283, 383, 483, 583: Image sensor

[0069] 190, 290, 390, 490, 590: optical axis

[0070] 10: Camera module

[0071] 11: Lens barrel

[0072] 12: Imaging lens group

[0073] 121: Imaging surface

[0074] 13: Image sensor

[0075] 14: The principal ray of the maximum viewing angle of the imaging lens group

[0076] f: overall focal length of the imaging lens group

[0077] FOV: Maximum field of view in the imaging lens group

[0078] EPD: Entrance pupil diameter of the imaging lens group

[0079] TL: The distance from the object side surface of the first lens to the imaging surface on the optical axis

[0080] CRA: The angle of the principal ray incident on the imaging surface at the maximum viewing angle of the imaging lens group

[0081] BFL: The distance from the image side surface of the sixth lens to the imaging plane on the optical axis

[0082] IMH: Maximum imaging height of the imaging lens group

[0083] R2: The radius of curvature of the image-side surface of the first lens

[0084] R4: The radius of curvature of the image-side surface of the second lens

[0085] R8: The curvature radius of the image-side surface of the fourth lens

[0086] T23: The distance between the second lens and the third lens on the optical axis

[0087] T34: The distance between the third lens and the fourth lens on the optical axis

[0088] T45: The distance between the fourth lens and the fifth lens on the optical axis

[0089] T56: The distance between the fifth lens and the sixth lens on the optical axis

[0090] CT2: The thickness of the second lens on the optical axis

[0091] CT3: Thickness of the third lens on the optical axis

[0092] CT4: The thickness of the fourth lens on the optical axis

[0093] CT5: The thickness of the fifth lens on the optical axis

[0094] CT6: The thickness of the sixth lens on the optical axis

[0095] f456: The combined focal length of the fourth, fifth and sixth lenses DETAILED DESCRIPTION

[0096] <First Embodiment>

[0097] Please refer to Figure 1A , Figure 1B and Figure 1C ,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 set of the first embodiment, to show the field curvature and distortion states of the imaging lens set in the visible light and infrared light bands. Figure 1C FIG. 1 is a schematic diagram of the parameter CRA in the first embodiment of the present invention. 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 filter element 170, a protective glass 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. There are six lenses with refractive power in the imaging lens group, but the present invention is not limited thereto. The image sensor 183 is disposed on the imaging surface 182.

[0098] The first lens 110 has negative refractive power and is made of plastic. 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 . Both the object-side surface 111 and the image-side surface 112 are spherical.

[0099] 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 concave near the optical axis 190 . Both the object-side surface 121 and the image-side surface 122 are spherical.

[0100] The third lens 130 has positive refractive power and is made of plastic. 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 . Both the object-side surface 131 and the image-side surface 132 are spherical.

[0101] 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 spherical.

[0102] 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 convex near the optical axis 190 . Both the object side surface 151 and the image side surface 152 are spherical surfaces. The fifth lens 150 is glued to the fourth lens 140 .

[0103] The sixth lens 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.

[0104] The filter element 170 is made of glass and is disposed between the sixth lens 160 and the imaging surface 182 without affecting the focal length of the imaging lens group. In this embodiment, the filter element 170 can be a filter that allows the visible light band to pass, a filter that allows the infrared light band to pass, or a filter that allows the visible light and infrared light bands to pass.

[0105] The protection glass 181 is made of glass and is disposed between the filter 170 and the imaging surface 182 without affecting the focal length of the imaging lens group.

[0106] The curve equations of the aspheric surfaces of the above lenses are expressed as follows:

[0107]

[0108] 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.

[0109] 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 picture) 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=1.25 (mm); Fno=2.00; FOV=190.00 (degrees) and EPD=0.61 (mm).

[0110] In the imaging lens group of the first embodiment, the distance from the object side surface 111 of the first lens 110 to the imaging surface 182 on the optical axis 190 is TL, the angle of the maximum viewing angle of the main light of the imaging lens group incident on the imaging surface 182 is CRA, the overall focal length of the imaging lens group is f, and the following condition is satisfied: TL*CRA / f=64.66°.

[0111] In the imaging lens group of the first embodiment, the angle of the principal ray of the maximum viewing angle of the imaging lens group incident on the imaging surface 182 is CRA, the distance from the image-side surface 162 of the sixth lens 160 to the imaging surface 182 on the optical axis 190 is BFL, the spacing distance between the second lens 120 and the third lens 130 on the optical axis 190 is T23, and the spacing distance between the third lens 130 and the fourth lens 140 on the optical axis 190 is T34, and the following condition is satisfied: (CRA*BFL) / (T23+T34)=9.97°.

[0112] In the imaging lens group of the first embodiment, the distance from the image side surface 162 of the sixth lens 160 to the imaging plane 182 on the optical axis 190 is BFL, the distance from the object side surface 111 of the first lens 110 to the imaging plane 182 on the optical axis 190 is TL, the incident pupil diameter of the imaging lens group is EPD, and the following condition is satisfied: (BFL*TL) / EPD=56.15mm.

[0113] In the imaging lens assembly of the first embodiment, the maximum field of view of the imaging lens assembly is FOV, the distance between the object side surface 111 of the first lens 110 and the imaging surface 182 on the optical axis 190 is TL, the overall focal length of the imaging lens assembly is f, and the following conditions are satisfied: FOV / (TL*f)=12.45° / mm 2 .

[0114] In the imaging lens assembly of the first embodiment, the thickness of the fourth lens 140 on the optical axis 190 is CT4, the thickness of the fifth lens 150 on the optical axis 190 is CT5, the thickness of the sixth lens 160 on the optical axis 190 is CT6, the spacing distance between the fourth lens 140 and the fifth lens 150 on the optical axis 190 is T45, the spacing distance between the fifth lens 150 and the sixth lens 160 on the optical axis 190 is T56, the distance between the image side surface 162 of the sixth lens 160 and the imaging surface 182 on the optical axis 190 is BFL, the curvature radius of the image side surface 142 of the fourth lens 140 is R8, and the following condition is satisfied: (CT4+T45+CT5+T56+CT6+BFL)*R8=-9.93mm 2 .

[0115] In the imaging lens group of the first embodiment, the distance from the object side surface 111 of the first lens 110 to the imaging surface 182 on the optical axis 190 is TL, the curvature radius of the image side surface 112 of the first lens 110 is R2, the overall focal length of the imaging lens group is f, and the following condition is satisfied: TL*R2 / f=20.18mm.

[0116] In the imaging lens assembly of the first embodiment, the thickness of the fourth lens 140 on the optical axis 190 is CT4, the thickness of the fifth lens 150 on the optical axis 190 is CT5, the thickness of the sixth lens 160 on the optical axis 190 is CT6, the spacing between the fourth lens 140 and the fifth lens 150 on the optical axis 190 is T45, the spacing between the fifth lens 150 and the sixth lens 160 on the optical axis 190 is T56, the distance between the image side surface 162 of the sixth lens 160 and the imaging surface 182 on the optical axis 190 is BFL, the curvature radius of the image side surface 142 of the fourth lens 140 is R8, and the distance between the object side surface 111 of the first lens 110 and the imaging surface 182 on the optical axis 190 is TL, and the following condition is satisfied: (CT4+T45+CT5+T56+CT6+BFL)*R8*TL=-120.77 mm 3 .

[0117] In the imaging lens group of the first embodiment, the distance from the object-side surface 111 of the first lens 110 to the imaging surface 182 on the optical axis 190 is TL, the thickness of the third lens 130 on the optical axis 182 is CT3, the maximum imaging height of the imaging lens group is IMH, and the following condition is satisfied: TL*CT3 / IMH=41.42mm.

[0118] In the imaging lens group of the first embodiment, the combined focal length of the fourth lens 140, the fifth lens 150 and the sixth lens 160 is f456, the curvature radius R2 of the image side surface 112 of the first lens 110, the curvature radius R4 of the image side surface 122 of the second lens 120, and the curvature radius R8 of the image side surface 142 of the fourth lens 140 satisfy the following condition: |(f456) / (R2*R4*R8)|=0.39 mm -2 .

[0119] In the imaging lens group of the first embodiment, the thickness of the second lens 120 on the optical axis 190 is CT2, the thickness of the third lens 130 on the optical axis 190 is CT3, the angle of the maximum viewing angle of the main light of the imaging lens group incident on the imaging surface 182 is CRA, and satisfies the following condition: (CT2+CT3)*CRA=11.15mm-deg.

[0120] In the imaging lens group of the first embodiment, the maximum field angle of the imaging lens group is FOV, the angle of the maximum viewing angle of the imaging lens group at which the principal ray is incident on the imaging surface 182 is CRA, and the following condition is satisfied: FOV / CRA=28.51.

[0121] In the imaging lens group of the first embodiment, the maximum imaging height of the imaging lens group is IMH, the overall focal length of the imaging lens group is f, and the following condition is satisfied: IMH / f=1.56.

[0122] Please refer to Table 1, Table 2 and Table 3 below.

[0123]

[0124]

[0125] Table 1 Figure 1A Detailed 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 surfaces from the object side to the image side in sequence, wherein surface 0 is the gap between the object and the object side surface 111 of 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 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 10 is the thickness of 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 12 is the thickness of the sixth lens 160 on the optical axis 190; surface 13 is the gap between the sixth lens 160 and the filter element 170 on the optical axis 190; surface 14 is the thickness of the filter element 170 on the optical axis 190; surface 15 is the gap between the filter element 170 and the protective glass 181 on the optical axis 190; surface 16 is the thickness of the protective glass 181 on the optical axis 190; surface 17 is the gap between the protective glass 181 and the imaging surface 182 on the optical axis 190.

[0126] 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, A22, and A24 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 and 2 of the first embodiment, and are not repeated here.

[0127] <Second Embodiment>

[0128] Please refer to Figure 2 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 set of the second embodiment, to show the field curvature and distortion of the imaging lens set in the visible light and infrared light bands. Figure 2A It 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 filter element 270, a protective glass 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. There are six lenses with refractive power in the imaging lens group, but the present invention is not limited thereto. The image sensor 283 is disposed on the imaging surface 282.

[0129] The first lens 210 has negative refractive power and is made of plastic. 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 . Both the object-side surface 211 and the image-side surface 212 are spherical.

[0130] 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 concave near the optical axis 290 . Both the object-side surface 221 and the image-side surface 222 are aspherical.

[0131] The third lens 230 has positive refractive power and is made of plastic. 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 . Both the object-side surface 231 and the image-side surface 232 are spherical.

[0132] 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 spherical.

[0133] The fifth lens 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 convex near the optical axis 290. Both the object side surface 251 and the image side surface 252 are spherical surfaces. The fifth lens 250 and the fourth lens 240 are glued together.

[0134] 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.

[0135] The filter element 270 is made of glass and is disposed between the sixth lens 260 and the imaging surface 282 without affecting the focal length of the imaging lens group. In this embodiment, the filter element 270 can be a filter that allows the visible light band to pass, a filter that allows the infrared light band to pass, or a filter that allows the visible light and infrared light bands to pass.

[0136] The protection glass 281 is made of glass and is disposed between the filter 270 and the imaging surface 282 without affecting the focal length of the imaging lens group.

[0137] Please refer to Table 4, Table 5 and Table 6 below.

[0138]

[0139]

[0140] 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.

[0141] The following data can be calculated by combining Tables 4 to 6:

[0142]

[0143]

[0144] <Third Embodiment>

[0145] 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 set of the third embodiment, to show the field curvature and distortion of the imaging lens set in the visible light and infrared light bands. Figure 3AIt 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 filter element 370, a protective glass 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. There are six lenses with refractive power in the imaging lens group, but the present invention is not limited thereto. The image sensor 383 is disposed on the imaging surface 382.

[0146] The first lens 310 has negative refractive power and is made of plastic. Its object side surface 311 is convex near the optical axis 390 , and its image side surface 312 is concave near the optical axis 390 . Both the object side surface 311 and the image side surface 312 are spherical.

[0147] 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.

[0148] The third lens 330 has positive refractive power and is made of plastic. Its object-side surface 331 is concave 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 spherical.

[0149] 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.

[0150] 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 concave near the optical axis 390 . Both the object-side surface 351 and the image-side surface 352 are aspherical.

[0151] 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.

[0152] The filter element 370 is made of glass, and is disposed between the sixth lens 360 and the imaging surface 382 without affecting the focal length of the imaging lens group. In this embodiment, the filter element 370 can be a filter that allows the visible light band to pass, a filter that allows the infrared light band to pass, or a filter that allows both the visible light and infrared light bands to pass.

[0153] The protective glass 381 is made of glass and is disposed between the filter 370 and the imaging surface 382 without affecting the focal length of the imaging lens group.

[0154] Please refer to Table 8, Table 9 and Table 10 below.

[0155]

[0156]

[0157] 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.

[0158] The following data can be calculated by combining Tables 8 to 10:

[0159]

[0160] <Fourth Embodiment>

[0161] 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 set of the fourth embodiment, to show the field curvature and distortion states of the imaging lens set in the visible light and infrared light bands. 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 filter element 470, a protective glass 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. There are six lenses with refractive power in the imaging lens group, but the present invention is not limited thereto. The image sensor 483 is disposed on the imaging surface 482.

[0162] The first lens 410 has negative refractive power and is made of plastic. 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 . Both the object-side surface 411 and the image-side surface 412 are spherical.

[0163] 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.

[0164] The third lens 430 has positive refractive power and is made of plastic. Its object-side surface 431 is convex near the optical axis 490 , and its image-side surface 432 is convex near the optical axis 490 . Both the object-side surface 431 and the image-side surface 432 are spherical.

[0165] 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.

[0166] 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.

[0167] 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.

[0168] The filter element 470 is made of glass, and is disposed between the sixth lens 460 and the imaging surface 482 without affecting the focal length of the imaging lens group. In this embodiment, the filter element 470 can be a filter that allows the visible light band to pass, a filter that allows the infrared light band to pass, or a filter that allows both the visible light and infrared light bands to pass.

[0169] The protective glass 481 is made of glass and is disposed between the filter 470 and the imaging surface 482 without affecting the focal length of the imaging lens group.

[0170] Please refer to Table 12, Table 13 and Table 14 below.

[0171]

[0172]

[0173]

[0174] 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.

[0175] The following data can be calculated by combining Tables 12 to 14:

[0176]

[0177] <Fifth Embodiment>

[0178] 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 set of the fifth embodiment, to show the field curvature and distortion of the imaging lens set in the visible light and infrared light bands. Figure 5A It 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 filter element 570, a protective glass 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. There are six lenses with refractive power in the imaging lens group, but the present invention is not limited thereto. The image sensor 583 is disposed on the imaging surface 582.

[0179] The first lens 510 has negative refractive power and is made of plastic. 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 . Both the object-side surface 511 and the image-side surface 512 are spherical.

[0180] 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.

[0181] The third lens 530 has positive refractive power and is made of plastic. Its object-side surface 531 is convex near the optical axis 590 , and its image-side surface 532 is convex near the optical axis 590 . Both the object-side surface 531 and the image-side surface 532 are spherical.

[0182] 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.

[0183] 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.

[0184] 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.

[0185] The filter element 570 is made of glass, and is disposed between the sixth lens 560 and the imaging surface 582 without affecting the focal length of the imaging lens group. In this embodiment, the filter element 570 can be a filter that allows the visible light band to pass, a filter that allows the infrared light band to pass, or a filter that allows both the visible light and infrared light bands to pass.

[0186] The protective glass 581 is made of glass and is disposed between the filter 570 and the imaging surface 582 without affecting the focal length of the imaging lens group.

[0187] Please refer to Table 16, Table 17 and Table 18 below.

[0188]

[0189]

[0190] 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.

[0191] The following data can be calculated by combining Tables 16 to 18:

[0192]

[0193]

[0194] <Sixth Embodiment>

[0195] Please refer to Figure 6 , depicts a camera module according to a sixth 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.

[0196] 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.

[0197] 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.

[0198] 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.

[0199] 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 cameras, digital cameras, mobile devices, digital tablets, 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; as well as a sixth lens element having positive refractive power; The distance from the object side surface of the first lens to the imaging plane on the optical axis is TL, the angle of the maximum viewing angle of the main light of the imaging lens group incident on the imaging plane is CRA, the overall focal length of the imaging lens group is f, and the following conditions are satisfied: 51.73°<TL*CRA / f<129.65°.

2. The imaging lens assembly according to claim 1, characterized in that: 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 sixth lens to the imaging plane on the optical axis is BFL, the spacing distance between the second lens and the third lens on the optical axis is T23, the spacing distance between the third lens and the fourth lens on the optical axis is T34, and the following conditions are satisfied: 7.40°<(CRA*BFL) / (T23+T34)<16.88°.

3. The imaging lens assembly according to claim 1, characterized in that: The distance from the image side surface of the sixth 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 entrance pupil diameter of the imaging lens group is EPD, and the following conditions are satisfied: 42.02mm<(BFL*TL) / EPD<74.86mm.

4. The imaging lens assembly according to claim 1, characterized in that: The maximum field of view of the imaging lens group is FOV, the distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, the overall focal length of the imaging lens group is f, and the following conditions are met: 9.08° / mm 2 <FOV / (TL*f)<17.63° / mm 2 .

5. The imaging lens assembly according to claim 1, characterized in that: The thickness of the fourth lens on the optical axis is CT4, the thickness of the fifth lens on the optical axis is CT5, the thickness of the sixth lens on the optical axis is CT6, 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 distance between the image side surface of the sixth lens and the imaging surface on the optical axis is BFL, the curvature radius of the image side surface of the fourth lens is R8, and the following conditions are met: -18.20mm 2 <(CT4+T45+CT5+T56+CT6+BFL)*R8<-7.67mm 2 .

6. The imaging lens assembly according to claim 1, characterized in that: The distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, the curvature radius of the image side surface of the first lens is R2, the overall focal length of the imaging lens group is f, and the following conditions are satisfied: 14.25mm<TL*R2 / f<39.32mm.

7. The imaging lens assembly according to claim 1, characterized in that: The thickness of the fourth lens on the optical axis is CT4, the thickness of the fifth lens on the optical axis is CT5, the thickness of the sixth lens on the optical axis is CT6, 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 distance from the image side surface of the sixth lens to the imaging plane on the optical axis is BFL, the radius of curvature of the image side surface of the fourth lens is R8, the distance from the object side surface of the first lens to the imaging plane on the optical axis is TL, and the following conditions are met: -242.64 mm 3 <(CT4+T45+CT5+T56+CT6+BFL)*R8*TL<-93.56mm 3 .

8. The imaging lens assembly according to claim 1, characterized in that: The distance from the object side surface of the first lens to the imaging plane on the optical axis is TL, the thickness of the third lens on the optical axis is CT3, the maximum imaging height of the imaging lens group is IMH, and the following conditions are satisfied: 33.13mm<TL*CT3 / IMH<69.96mm.

9. The imaging lens assembly according to claim 1, characterized in that: The combined focal length of the fourth lens, the fifth lens and the sixth lens is f456, 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 curvature radius of the image side surface of the fourth lens is R8, and the following conditions are met: 0.31 mm -2 <|(f456) / (R2*R4*R8)|<0.70mm -2 .

10. The imaging lens assembly according to claim 1, characterized in that: The thickness of the second lens on the optical axis is CT2, the thickness of the third lens on the optical axis is CT3, the angle of the maximum viewing angle of the imaging lens group when the principal ray is incident on the imaging surface is CRA, and the following conditions are satisfied: 8.38mm-deg.<(CT2+CT3)*CRA<25.30mm-deg.

11. The imaging lens assembly according to claim 1, characterized in that: The maximum field angle of the imaging lens group is FOV, the angle of the maximum viewing angle of the imaging lens group at which the principal ray is incident on the imaging surface is CRA, and the following conditions are satisfied: 19.22<FOV / CRA<34.

21.

12. The imaging lens assembly according to claim 1, characterized in that: The maximum imaging height of the imaging lens group is IMH, the overall focal length of the imaging lens group is f, and the following condition is satisfied: 1.12<IMH / f<2.

22.

13. A camera module, characterized in that: Include: A lens tube; An imaging lens assembly as claimed in any one of claims 1 to 12, arranged in the lens barrel; and An image sensor is disposed on the imaging surface of the imaging lens group.

Images