Imaging lens group and electronic device

Abstract

The invention relates to an imaging lens group, which comprises a diaphragm, and the diaphragm sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side, a second lens element with positive refractive power; wherein the imaging lens group has two total lens elements with refractive power, the curvature radius R1 of the object-side surface of the first lens element, the curvature radius R2 of the image-side surface of the first lens element and the curvature radius R4 of the image-side surface of the second lens element, and the following conditions are satisfied:-1.45 mmlt; (R1 / R4) * R2lt; and the thickness is-0.34 mm.

Description

Technical Field

[0001] The present invention relates to an imaging lens group and an electronic device, and in particular to an imaging lens group applied to an electronic product. Background Art

[0002] Biometric systems, which are based on the unique biological characteristics of each organism, are often used in existing mobile devices on the market and may even be used in future electronic devices because of their uniqueness, universality, permanence, measurability, convenience, acceptability, and non-deception. However, most biometric systems used in mobile devices currently use the capacitance principle, which can reduce the volume required for the biometric system, but the circuit structure is too complicated, making the manufacturing cost too high, and the unit price of the product is also relatively high.

[0003] Although there are traditional biometric systems that use optical imaging principles, such as fingerprint recognition and vein recognition, traditional biometric systems have the problem of being too large, making it difficult to miniaturize electronic devices equipped with biometric systems and even more difficult to carry.

[0004] In view of this, how to provide an imaging lens assembly and an electronic device, wherein the imaging lens assembly can be used as a biometric identification system and can be mounted on the electronic device so that the electronic device can be miniaturized for portability is a technical bottleneck that needs to be overcome urgently. Summary of the invention

[0005] The purpose of the present invention is to provide an imaging lens assembly and an electronic device, wherein the imaging lens assembly comprises two lenses with refractive power, and when certain conditions are met, the imaging lens assembly provided by the present invention can simultaneously meet the requirements of miniaturization and improve imaging quality.

[0006] 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.

[0007] An imaging lens group provided by the present invention according to one embodiment includes a light barrier, which includes, from the object side to the image side, in order: a first lens having negative refractive power, the image side surface of the first lens being convex near the optical axis, and at least one of the object side surface and the image side surface of the first lens being aspherical; a second lens having positive refractive power, the object side surface of the second lens being convex near the optical axis, the image side surface of the second lens being convex near the optical axis, and at least one of the object side surface and the image side surface of the second lens being aspherical.

[0008] In an imaging lens group, the total number of lenses with refractive power in the imaging lens group is two, the overall focal length of the imaging lens group is f, the aperture value of the imaging lens group is Fno, the maximum viewing angle in the imaging lens group is FOV, the curvature radius of the object side surface of the first lens is R1, 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 angle of the principal ray of the maximum viewing angle of the imaging lens group incident on the imaging surface is CRA, the focal length of the first lens is f1, the distance from the image side surface of the first lens to a light stop on the optical axis is T1S, the dispersion coefficient of the first lens is vd1, the dispersion coefficient of the second lens is vd2, the thickness of the first lens on the optical axis is CT1, the distance from the object side surface of the flat plate assembly to the imaging surface on the optical axis is OTL, the distance from the flat plate assembly to the first lens on the optical axis is TG1, and at least one of the following conditions is satisfied:

[0009] -1.45mm<(R1 / R4)*R2<-0.34mm;

[0010] -2.60<(R1+R2) / (R3+R4)<-0.62;

[0011] 50.53° / mm <CRA / f<86.49° / mm;

[0012] 35.17° <CRA*Fno<90.89°;

[0013] 33.47°<(R2 / f1)*FOV<75.51°;

[0014] -4.77 <R3 / R4<-1.95;

[0015] -6.18 <f1 / T1S<-3.54;

[0016] 89.58 <vd1+vd2<134.37;

[0017] -11.58mm <f1*R3 / CT1<-4.10mm;

[0018] -25.27<(FOV / OTL)*R2<-11.72;

[0019] 61.43°<(FOV / TG1)*R3<105.40°.

[0020] When -1.45mm<(R1 / R4)*R2<-0.34mm is satisfied, it is helpful to correct aberrations through appropriate curvature matching.

[0021] When -2.60 < (R1 + R2) / (R3 + R4) < -0.62 is satisfied, a large incident light amount can be obtained by a suitable combination of curvature and lens shape.

[0022] When 50.53° / mm < CRA / f < 86.49° / mm is satisfied, the chief ray of the imaging lens group meets the incident angle requirement on the imaging surface.

[0023] When 35.17° < CRA * Fno < 90.89° is satisfied, the chief ray of the imaging lens group meets the incident angle requirement on the imaging surface and the large incident light amount target is achieved.

[0024] When 33.47° < (R2 / f1) * FOV < 75.51° is satisfied, through a better ratio design, it is beneficial to correct aberration to improve the imaging quality of the imaging lens group.

[0025] When -4.77 < R3 / R4 < -1.95 is satisfied, through a suitable combination of curvature, it is beneficial to correct aberration.

[0026] When -6.18 < f1 / T1S < -3.54 is satisfied, through a suitable ratio design, a large incident light amount and an increased maximum viewing angle can be obtained.

[0027] When 89.58 < vd1 + vd2 < 134.37 is satisfied, through a suitable selection of lens materials, the manufacturing cost can be reduced.

[0028] When -11.58mm < f1 * R3 / CT1 < -4.10mm is satisfied, through a suitable ratio design, it is beneficial to correct aberration.

[0029] When -25.27 < (FOV / OTL) * R2 < -11.72 is satisfied, through a suitable ratio design, the wide - angle and miniaturized module goals are achieved.

[0030] When 61.43° < (FOV / TG1) * R3 < 105.40° is satisfied, through a suitable ratio design, a larger viewing angle is provided and the imaging quality of the imaging lens group is maintained.

[0031] In addition, according to an embodiment of the present invention, an imaging device is further provided, which sequentially includes, from the object side to the image side: a flat plate component; the above - mentioned imaging lens group; and an image sensor.

[0032] In addition, according to an embodiment of the present invention, an electronic device is further provided, which includes an imaging device; a control unit electrically connected to the imaging device; and a storage unit electrically connected to the control unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Other aspects and advantages of the present invention will be discovered after studying the detailed description in conjunction with the following drawings:

[0034] Figure 1A FIG. 1 is a schematic diagram of an imaging lens assembly according to a first embodiment of the present invention.

[0035] Figure 1B From left to right are the image plane curvature and distortion error curves of the first embodiment.

[0036] Figure 1C FIG. 1 is a schematic diagram of an imaging device according to a first embodiment of the present invention.

[0037] Figure 2A FIG. 4 is a schematic diagram of an imaging lens assembly according to a second embodiment of the present invention.

[0038] Figure 2B From left to right are the image plane curvature and distortion error curves of the second embodiment.

[0039] Figure 2C FIG. 1 is a schematic diagram of an imaging device according to a second embodiment of the present invention.

[0040] Figure 3A FIG. 4 is a schematic diagram of an imaging lens assembly according to a third embodiment of the present invention.

[0041] Figure 3B From left to right are the image plane curvature and distortion error curves of the third embodiment.

[0042] Figure 3C It is a schematic diagram of an imaging device according to a third embodiment of the present invention.

[0043] Figure 4A FIG. 4 is a schematic diagram of an imaging lens assembly according to a fourth embodiment of the present invention.

[0044] Figure 4B From left to right are the image plane curvature and distortion error curves of the fourth embodiment.

[0045] Figure 4C FIG. 4 is a schematic diagram of an imaging device according to a fourth embodiment of the present invention.

[0046] Figure 5A FIG. 5 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 image plane curvature and distortion error curves of the fifth embodiment.

[0048] Figure 5C FIG. 5 is a schematic diagram of an imaging device according to a fifth embodiment of the present invention.

[0049] Figure 6It is a schematic diagram of an imaging device including an imaging lens assembly installed on an electronic device according to a first embodiment of the present invention.

[0050] Figure 7 Tie Figure 6 Schematic cross-sectional side view of .

[0051] Description of symbols in the accompanying drawings:

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

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

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

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

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

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

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

[0059] 150, 250, 350, 450, 550: Flat panel assembly

[0060] 151: Object side surface

[0061] 160, 260, 360, 460, 560: Infrared filter components

[0062] 170, 270, 370, 470, 570: Imaging surface

[0063] 180, 280, 380, 480, 580: Image sensor

[0064] 190, 290, 390, 490, 590: optical axis

[0065] 10: Electronic devices

[0066] 11: Imaging device

[0067] 12: Control unit

[0068] 13: Storage unit

[0069] 14: Imaging lens group

[0070] f: overall focal length of the imaging lens group

[0071] Fno: Aperture value of the imaging lens group

[0072] FOV: The maximum viewing angle of the imaging lens group

[0073] R1: The radius of curvature of the object side surface of the first lens

[0074] R2: The radius of curvature of the image-side surface of the first lens

[0075] R3: The radius of curvature of the object side surface of the second lens

[0076] R4: The radius of curvature of the image-side surface of the second lens

[0077] CRA: The angle of the principal ray incident on the imaging surface at the maximum viewing angle of the imaging lens group

[0078] f1: focal length of the first lens

[0079] T1S: The distance from the image side surface of the first lens to the aperture stop on the optical axis

[0080] vd1: dispersion coefficient of the first lens

[0081] vd2: dispersion coefficient of the second lens

[0082] CT1: The thickness of the first lens on the optical axis

[0083] OTL: The distance from the object side surface of the flat panel assembly to the imaging surface on the optical axis

[0084] TG1: The distance from the flat plate assembly to the first lens on the optical axis

[0085] O: Subject DETAILED DESCRIPTION

[0086] <First Embodiment>

[0087] 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 image plane curvature and distortion error curves of the first embodiment. Figure 1C FIG. 1 is a schematic diagram of an imaging device according to a first embodiment of the present invention. Figure 1A It can be seen that the imaging lens group includes a first lens 110, a light barrier 100, a second lens 120, an infrared filter element 160, and an imaging surface 170 in order from the object side to the image side. The imaging lens group includes two lenses (110, 120) with refractive power, but is not limited thereto. Figure 1CIt can be seen that the imaging device includes a flat panel assembly 150 , the aforementioned imaging lens group (not labeled in the figure) and an image sensor 180 in order from the object side to the image side. The image sensor 180 is disposed on the imaging surface 170 .

[0088] The flat panel assembly 150 is made of glass, and is disposed between an object O and the first lens 110, and does not affect the focal length of the imaging lens group. It is understood that the flat panel assembly 150 can be made of other materials.

[0089] The first lens 110 has negative refractive power and is made of plastic. Its object-side surface 111 is concave near the optical axis 190 , and its image-side surface 112 is convex near the optical axis 190 . Both the object-side surface 111 and the image-side surface 112 are aspherical.

[0090] The second lens 120 has positive refractive power and is made of plastic. Its object-side surface 121 is convex near the optical axis 190 , and its image-side surface 122 is convex near the optical axis 190 . Both the object-side surface 121 and the image-side surface 122 are aspherical.

[0091] The infrared filter element 160 is made of glass and is disposed between the second lens 120 and the imaging surface 170 without affecting the focal length of the imaging lens group.

[0092] The curve equations of the aspheric surfaces of the above lenses are expressed as follows:

[0093]

[0094] 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.

[0095] 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 angle of the main light of the maximum viewing angle of the imaging lens group incident on the imaging surface is CRA, and its values ​​are as follows: f=0.45mm (millimeter); Fno=1.54; FOV=119.08° (degrees); and CRA=28.63° (degrees).

[0096] In the imaging lens group of the first embodiment, the curvature radius R1 of the object side surface 111 of the first lens 110, the curvature radius R2 of the image side surface 112 of the first lens 110, and the curvature radius R4 of the image side surface 122 of the second lens 120 satisfy the following condition: (R1 / R4)*R2=-0.95mm.

[0097] In the imaging lens group of the first embodiment, the curvature radius R1 of the object side surface 111 of the first lens 110, the curvature radius R2 of the image side surface 112 of the first lens 110, the curvature radius R3 of the object side surface 121 of the second lens 120, and the curvature radius R4 of the image side surface 122 of the second lens 120 satisfy the following condition: (R1+R2) / (R3+R4)=-1.95.

[0098] 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 is CRA, the overall focal length of the imaging lens group is f, and the following condition is satisfied: CRA / f=63.16° / mm.

[0099] 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 is CRA, the aperture value of the imaging lens group is Fno, and the following condition is satisfied: CRA*Fno=43.96°.

[0100] In the imaging lens group of the first embodiment, the curvature radius of the image side surface 112 of the first lens 110 is R2, the focal length of the first lens 110 is f1, the maximum viewing angle in the imaging lens group is FOV, and the following conditions are satisfied: (R2 / f1)*FOV=64.68°.

[0101] In the imaging lens group of the first embodiment, the curvature radius R3 of the object-side surface 121 of the second lens 120 and the curvature radius R4 of the image-side surface 122 of the second lens 120 satisfy the following condition: R3 / R4=-2.77.

[0102] In the imaging lens assembly of the first embodiment, the focal length of the first lens 110 is f1, the distance from the image-side surface 112 of the first lens 110 to a stop 100 on the optical axis 190 is T1S, and the following condition is satisfied: f1 / T1S=-5.12.

[0103] In the imaging lens group of the first embodiment, the dispersion coefficient of the first lens 110 is vd1, the dispersion coefficient of the second lens 120 is vd2, and the following condition is satisfied: vd1+vd2=111.97.

[0104] In the imaging lens group of the first embodiment, the focal length of the first lens 110 is f1, the curvature radius of the object side surface 121 of the second lens 120 is R3, the thickness of the first lens 110 on the optical axis 190 is CT1, and the following condition is satisfied: f1*R3 / CT1=-5.92mm.

[0105] In the imaging lens group of the first embodiment, the curvature radius of the image side surface 112 of the first lens 110 is R2, the maximum viewing angle in the imaging lens group is FOV, the distance from the object side surface 151 of the flat panel assembly 150 to the imaging surface 170 on the optical axis 190 is OTL, and the following condition is satisfied: (FOV / OTL)*R2=-20.71.

[0106] In the imaging lens group of the first embodiment, the maximum viewing angle of the imaging lens group is FOV, the distance from the flat panel assembly 150 to the first lens 110 on the optical axis 190 is TG1, and the curvature radius R3 of the object side surface 121 of the second lens 120 is: (FOV / TG1)*R3=74.19°.

[0107] Please refer to Table 1 and Table 2 below.

[0108]

[0109]

[0110]

[0111] 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 0-10 represent surfaces from the object side to the image side in sequence, wherein surface 0 is the gap between the object O and the object side surface 151 of the flat panel assembly 150; surface 1 is the thickness of the flat panel assembly 150 on the optical axis 190; surface 2 is the gap between the flat panel assembly 150 and the first lens 110; surface 3 is the thickness of the first lens 110 on the optical axis 190; surface 4 is the gap between the first lens 110 and the light bar 100; surface 5 is the gap between the light bar 100 and the object side surface 121 of the second lens 120; surface 6 is the thickness of the second lens 120 on the optical axis 190; surface 7 is the gap between the second lens 120 and the infrared filter assembly 160; surface 8 is the thickness of the infrared filter assembly 160 on the optical axis 190; surface 9 is the gap between the infrared filter assembly 160 and the imaging surface 170; and surface 10 is the imaging surface 170. Table 2 is the aspheric surface data in the first embodiment, wherein k represents 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.

[0112] <Second Embodiment>

[0113] Please refer to Figure 2A , Figure 2B and Figure 2C ,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 image plane curvature and distortion error curves of the second embodiment. Figure 2C FIG. 1 is a schematic diagram of an imaging device according to a second embodiment of the present invention. Figure 2A It can be seen that the imaging lens group includes a first lens 210, a light barrier 200, a second lens 220, an infrared filter element 260, and an imaging surface 270 in order from the object side to the image side. The imaging lens group includes two lenses (210, 220) with refractive power, but the present invention is not limited thereto. Figure 2C It can be seen that the imaging device includes a flat panel assembly 250 , the aforementioned imaging lens group (not labeled in the figure) and an image sensor 280 in order from the object side to the image side. The image sensor 280 is disposed on the imaging surface 270 .

[0114] The flat panel assembly 250 is made of glass, and is disposed between an object O and the first lens 210, and does not affect the focal length of the imaging lens group. It is understood that the flat panel assembly 150 can be made of other materials.

[0115] The first lens 210 has negative refractive power and is made of plastic. Its object-side surface 211 is concave near the optical axis 290 , and its image-side surface 212 is convex near the optical axis 290 . Both the object-side surface 211 and the image-side surface 212 are aspherical.

[0116] The second lens 220 has positive refractive power and is made of plastic. Its object-side surface 221 is convex near the optical axis 290 , and its image-side surface 222 is convex near the optical axis 290 . Both the object-side surface 221 and the image-side surface 222 are aspherical.

[0117] The infrared filter element 260 is made of glass and is disposed between the second lens 220 and the imaging surface 270 without affecting the focal length of the imaging lens group.

[0118] Please refer to Table 3 and Table 4 below.

[0119]

[0120]

[0121]

[0122] 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.

[0123] The following data can be calculated by combining Table 3 and Table 4:

[0124]

[0125] <Third Embodiment>

[0126] Please refer to Figure 3A , Figure 3B and Figure 3C ,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 image plane curvature and distortion error curves of the third embodiment. Figure 3C FIG. 1 is a schematic diagram of an imaging device according to a third embodiment of the present invention. Figure 3A It can be seen that the imaging lens group includes a first lens 310, a light barrier 300, a second lens 320, an infrared filter element 360, and an imaging surface 370 in order from the object side to the image side. The imaging lens group includes three lenses (310, 320) with refractive power, but is not limited thereto. Figure 3CIt can be seen that the imaging device includes a flat panel assembly 350 , the aforementioned imaging lens group (not labeled in the figure) and an image sensor 380 in order from the object side to the image side. The image sensor 380 is disposed on the imaging surface 370 .

[0127] The flat panel assembly 350 is made of glass, and is disposed between an object O and the first lens 310, and does not affect the focal length of the imaging lens group. It is understood that the flat panel assembly 350 can be made of other materials.

[0128] The first lens 310 has negative refractive power and is made of plastic. Its object side surface 311 is concave near the optical axis 390 , and its image side surface 312 is convex near the optical axis 390 . Both the object side surface 311 and the image side surface 312 are aspherical.

[0129] The second lens 320 has positive 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 convex near the optical axis 390 . Both the object-side surface 321 and the image-side surface 322 are aspherical.

[0130] The infrared filter element 360 is made of glass, and is disposed between the second lens 320 and the imaging surface 370 without affecting the focal length of the imaging lens group.

[0131] Please refer to Table 6 and Table 7 below.

[0132]

[0133]

[0134]

[0135] 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.

[0136] The following data can be calculated by combining Table 6 and Table 7:

[0137]

[0138] <Fourth Embodiment>

[0139] Please refer to Figure 4A , Figure 4B and Figure 4C ,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 image plane curvature and distortion error curves of the fourth embodiment. Figure 4C FIG. 4 is a schematic diagram of an imaging device according to a fourth embodiment of the present invention. Figure 4A It can be seen that the imaging lens group includes a first lens 410, a light barrier 400, a second lens 420, an infrared filter element 460, and an imaging surface 470 in order from the object side to the image side. The imaging lens group includes three lenses (410, 420) with refractive power, but the present invention is not limited thereto. Figure 4C It can be seen that the imaging device includes a flat panel assembly 450 , the aforementioned imaging lens group (not labeled in the figure) and an image sensor 480 in order from the object side to the image side. The image sensor 480 is disposed on the imaging surface 470 .

[0140] The flat panel assembly 450 is made of glass, and is disposed between an object O and the first lens 410, and does not affect the focal length of the imaging lens group. It is understood that the flat panel assembly 450 can be made of other materials.

[0141] The first lens 410 has negative refractive power and is made of plastic. Its object side surface 411 is concave near the optical axis 490 , and its image side surface 412 is convex near the optical axis 490 . Both the object side surface 411 and the image side surface 412 are aspherical.

[0142] The second lens 420 has positive 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 convex near the optical axis 490 . Both the object-side surface 421 and the image-side surface 422 are aspherical.

[0143] The infrared filter element 460 is made of glass, and is disposed between the second lens 420 and the imaging surface 470 without affecting the focal length of the imaging lens group.

[0144] Please refer to Table 9 and Table 10 below.

[0145]

[0146]

[0147]

[0148] 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.

[0149] The following data can be calculated by combining Table 9 and Table 10:

[0150]

[0151] <Fifth Embodiment>

[0152] Please refer to Figure 5A , Figure 5B and Figure 5C ,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 image plane curvature and distortion error curves of the fifth embodiment. Figure 5C FIG. 5 is a schematic diagram of an imaging device according to a fifth embodiment of the present invention. Figure 5A It can be seen that the imaging lens group includes a first lens 510, a light barrier 500, a second lens 520, an infrared filter element 560, and an imaging surface 570 in order from the object side to the image side. The imaging lens group includes three lenses (510, 520) with refractive power, but the present invention is not limited thereto. Figure 5C It can be seen that the imaging device includes a flat panel assembly 550 , the aforementioned imaging lens group (not labeled in the figure) and an image sensor 580 in order from the object side to the image side. The image sensor 580 is disposed on the imaging surface 570 .

[0153] The flat panel assembly 550 is made of glass, and is disposed between an object O and the first lens 510, and does not affect the focal length of the imaging lens group. It is understood that the flat panel assembly 550 can be made of other materials.

[0154] The first lens 510 has negative refractive power and is made of plastic. Its object side surface 511 is concave near the optical axis 590 , and its image side surface 512 is convex near the optical axis 590 . Both the object side surface 511 and the image side surface 512 are aspherical.

[0155] The second lens 520 has positive 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 convex near the optical axis 590 . Both the object-side surface 521 and the image-side surface 522 are aspherical.

[0156] The infrared filter element 560 is made of glass, and is disposed between the second lens 520 and the imaging surface 570 without affecting the focal length of the imaging lens group.

[0157] Please refer to Table 12 and Table 13 below.

[0158]

[0159]

[0160] 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.

[0161] The following data can be calculated by combining Table 12 and Table 13:

[0162]

[0163] Please refer to Figure 6 and Figure 7 , Figure 6 1 is a schematic diagram of an imaging device 11 including an imaging lens group 14 installed on an electronic device 10 according to a first embodiment of the present invention, but the present invention is not limited thereto. The imaging devices of the above embodiments can all be installed on the electronic device 10, so that the electronic device 10 has a biometric identification system for fingerprint identification. Figure 7 yes Figure 6 The electronic device 10 includes an imaging device 11, a control unit 12, and a storage unit 13. The control unit 12 is electrically connected to the imaging device 11, and the storage unit 13 is electrically connected to the control unit 12. Preferably, the electronic device 10 may further include a display unit, a temporary storage unit (RAM), a battery, a communication module, a touch module, a housing, or a combination thereof.

[0164] 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. Therefore, the total length of the imaging lens set of the present invention can be effectively reduced.

[0165] In the imaging lens assembly provided by the present invention, the infrared filter component is made of glass, but is not limited thereto and may also be made of other materials with high dispersion coefficients.

[0166] 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.

[0167] The imaging lens assembly provided by the present invention can be further applied to electronic devices such as digital cameras, mobile devices, digital drawing tablets, smart TVs and 3D (three-dimensional) image capture, wearable displays of virtual reality (VR) or augmented reality (AR), etc., according to visual needs. The aforementioned electronic devices are merely illustrative examples of the actual application of the present invention and do not limit the scope of application of the electronic devices of the present invention.

Claims

1. An imaging lens assembly, characterized in that: The imaging lens group includes a light barrier, which includes, from the object side to the image side, the following: a first lens having negative refractive power, wherein the image-side surface of the first lens is convex near the optical axis, and at least one of the object-side surface and the image-side surface of the first lens is aspherical; a second lens having positive refractive power, wherein the object-side surface of the second lens is convex near the optical axis, the image-side surface of the second lens is convex near the optical axis, and at least one of the object-side surface and the image-side surface of the second lens is aspherical; The imaging lens group includes two lenses with refractive power, the object side surface of the first lens has a curvature radius of R1, the image side surface of the first lens has a curvature radius of R2, and the image side surface of the second lens has a curvature radius of R4, and the following conditions are satisfied: -1.45mm<(R1 / R4)*R2<-0.34mm.

2. The imaging lens assembly according to claim 1, characterized in that: The curvature radius R1 of the object side surface of the first lens, the curvature radius R2 of the image side surface of the first lens, the curvature radius R3 of the object side surface of the second lens, and the curvature radius R4 of the image side surface of the second lens satisfy the following condition: -2.60<(R1+R2) / (R3+R4)<-0.

62.

3. The imaging lens assembly according to claim 1, characterized in that: 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 overall focal length of the imaging lens group is f, and the following conditions are met: 50.53° / mm <CRA / f<86.49° / mm。 4. The imaging lens assembly according to claim 1, characterized in that: The angle of the maximum viewing angle of the imaging lens group and the incident angle of the principal ray on the imaging surface is CRA, and the aperture value of the imaging lens group is Fno, and meets the following conditions: 35.17° <CRA*Fno<90.89°。 5. 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 focal length of the first lens is f1, the maximum viewing angle in the imaging lens group is FOV, and the following conditions are satisfied: 33.47°<(R2 / f1)*FOV<75.51°.

6. 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, and the curvature radius of the image side surface of the second lens is R4, and the following conditions are satisfied: -4.77 <R3 / R4<-1.95。 7. The imaging lens assembly according to claim 1, characterized in that: The focal length of the first lens is f1, the distance from the image side surface of the first lens to a light stop on the optical axis is T1S, and the following conditions are met: -6.18 <f1 / T1S<-3.54。 8. The imaging lens assembly according to claim 1, characterized in that: The dispersion coefficient of the first lens is vd1, and the dispersion coefficient of the second lens is vd2, and the following conditions are met: 89.58 <vd1+vd2<134.37。 9. The imaging lens assembly according to claim 1, characterized in that: The focal length of the first lens is f1, the curvature radius of the object side surface of the second lens is R3, the thickness of the first lens on the optical axis is CT1, and the following conditions are met: -11.58 mm <f1*R3 / CT1<-4.10mm。 10. An electronic device comprising an imaging device; a control unit electrically connected to the imaging device; and a storage unit electrically connected to the control unit; characterized in that: The imaging device comprises a light barrier, which comprises, in order from the object side to the image side: a flat panel assembly; an imaging lens group; and an image sensor; The imaging lens group includes, from the object side to the image side, the following: a first lens having negative refractive power, wherein the image-side surface of the first lens is convex near the optical axis, and at least one of the object-side surface and the image-side surface of the first lens is aspherical; a second lens having positive refractive power, wherein the object-side surface of the second lens is convex near the optical axis, the image-side surface of the second lens is convex near the optical axis, and at least one of the object-side surface and the image-side surface of the second lens is aspherical; The total number of lenses with refractive power in the imaging lens group is two, the curvature radius of the object side surface of the first lens is R1, 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 maximum viewing angle in the imaging lens group is FOV, the distance from the object side surface of the flat panel assembly to the imaging plane on the optical axis is OTL, and the following conditions are satisfied: -1.45mm<(R1 / R4)*R2<-0.34mm and -25.27<(FOV / OTL)*R2<-11.

72.

11. The electronic device according to claim 10, characterized in that: The maximum viewing angle of the imaging lens group is FOV, the distance from the flat panel assembly to the first lens on the optical axis is TG1, and the curvature radius R3 of the object side surface of the second lens is: 61.43°<(FOV / TG1)*R3<105.40°.

12. The electronic device according to claim 10, characterized in that: 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 overall focal length of the imaging lens group is f, and the following conditions are met: 50.53° / mm <CRA / f<86.49° / mm。 13. The electronic device according to claim 10, characterized in that: The angle of the maximum viewing angle of the imaging lens group and the incident angle of the principal ray on the imaging surface is CRA, and the aperture value of the imaging lens group is Fno, and meets the following conditions: 35.17° <CRA*Fno<90.89°。 14. The electronic device according to claim 10, characterized in that: The focal length of the first lens is f1, the curvature radius of the object side surface of the second lens is R3, the thickness of the first lens on the optical axis is CT1, and the following conditions are met: -11.58 mm <f1*R3 / CT1<-4.10mm。 15. The electronic device according to claim 10, characterized in that: The dispersion coefficient of the first lens is vd1, and the dispersion coefficient of the second lens is vd2, and the following conditions are met: 89.58 <vd1+vd2<134.37。

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