CN113156609A

CN113156609A - Three-piece thin imaging lens group

Info

Publication number: CN113156609A
Application number: CN202010012252.1A
Authority: CN
Inventors: 黄靖昀
Original assignee: Xinju Technology Co ltd
Current assignee: Xinju Technology Co ltd
Priority date: 2020-01-07
Filing date: 2020-01-07
Publication date: 2021-07-23
Anticipated expiration: 2040-01-07
Also published as: CN113156609B

Abstract

The invention is a three-piece thin imaging lens group, comprising in order from an object side to an image side: a plate element made of glass; a first lens element with negative refractive power; an aperture; a second lens element with positive refractive power; and a third lens element with refractive power; the three lens elements with refractive power in the three-piece thin imaging lens group are three, the distance from a subject to an imaging surface on an optical axis is OTL, the distance from the image side surface of the flat panel element to the imaging surface on the optical axis is PTL, the image height of the imaging surface is Y, the object height at the image side surface of the flat panel element corresponding to the chief ray of the image height of the imaging surface is P, and the following conditions are satisfied: 2.5 mm < PTL <4.5 mm; 2.2< P/Y < 7.0; 4 mm < OTL/Y <12 mm. So as to effectively collect the light with large angle, and receive the image with wider range in the extremely short object distance and achieve the identification effect.

Description

Three-piece thin imaging lens group

Technical Field

The present invention relates to a lens assembly, and more particularly to a three-piece thin imaging lens assembly for use in electronic products.

Background

Biometric (Biometric) systems based on the unique and universal Biometric features of each living being are often used in mobile devices currently on the market, and even in future electronic devices, due to their uniqueness, universality, permanence, testability, convenience, acceptability, and non-fraud. However, the biometric identification system associated with the mobile device usually employs the capacitance principle, which can reduce the volume required by the biometric identification system, but the circuit structure is too complex, so that the manufacturing cost is too high and the relative unit price is also high.

Although conventional biometric identification systems using optical imaging principles, such as fingerprint identification and vein identification, have been used, the conventional biometric identification systems have a problem of an excessively large volume, so that the electronic devices equipped with the biometric identification systems are not easy to be miniaturized and portable.

In view of the above, it is a technical bottleneck to be overcome at present how to provide a thin imaging lens set that can be used as a biometric identification system and can be mounted on an electronic device so that the electronic device can be miniaturized and portable.

Disclosure of Invention

The present invention provides a three-piece thin imaging lens assembly, and more particularly, to a three-piece thin imaging lens assembly which is helpful to reduce the distance between a subject and the three-piece thin imaging lens assembly, effectively reduce the size, and maintain the miniaturization of the three-piece thin imaging lens assembly.

Another objective of the present invention is to provide a three-piece thin imaging lens assembly, and more particularly, to a three-piece thin imaging lens assembly capable of effectively collecting light with a large angle, so that the three-piece thin imaging lens assembly can receive an image with a wider range and achieve an identification effect within a very short object distance.

To achieve the above object, the present invention provides a three-piece thin imaging lens assembly, in order from an object side to an image side, comprising: a plate element made of glass; the first lens element with negative refractive power has at least one of an object-side surface and an image-side surface thereof being aspheric; an aperture; the second lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof, and at least one of the object-side surface and the image-side surface thereof being aspheric; the third lens element with refractive power has at least one of an object-side surface and an image-side surface thereof being aspheric;

the three lens elements with refractive power in the three-piece thin imaging lens group have an OTL distance on the optical axis from the object to the imaging surface, a PTL distance on the optical axis from the image side surface of the flat panel element to the imaging surface, an image height of the imaging surface being Y, an object height at the image side surface of the flat panel element corresponding to a chief ray of the image height being P, and the following conditions are satisfied: 2.5 mm < PTL <4.5 mm; 2.2< P/Y < 7.0; 4 mm < OTL/Y <12 mm.

Preferably, the overall focal length of the three-piece thin imaging lens group is f, the focal length of the first lens element is f1, and the following conditions are satisfied: -0.86< f/f1< -0.22. Therefore, the refractive power configuration of the three-piece thin imaging lens group can be balanced, so that the aberration of the three-piece thin imaging lens group can be effectively corrected, and meanwhile, the sensitivity of the three-piece thin imaging lens group is reduced.

Preferably, the overall focal length of the three-piece thin imaging lens group is f, the focal length of the second lens element is f2, and the following conditions are satisfied: 0.05< f/f2< 1.27. Therefore, the refractive power configuration of the three-piece thin imaging lens group can be balanced, so that the aberration of the three-piece thin imaging lens group can be effectively corrected, and meanwhile, the sensitivity of the three-piece thin imaging lens group is reduced.

Preferably, the overall focal length of the three-piece thin imaging lens group is f, the focal length of the third lens element is f3, and the following conditions are satisfied: -0.17< f/f3< 0.82. Therefore, the refractive power configuration of the three-piece thin imaging lens group can be balanced, so that the aberration of the three-piece thin imaging lens group can be effectively corrected, and meanwhile, the sensitivity of the three-piece thin imaging lens group is reduced.

Preferably, the overall focal length of the three-piece thin imaging lens group is f, and the combined focal length of the second lens element and the third lens element is f23, and the following conditions are satisfied: 0.45< f/f23< 1.04. Therefore, the three-piece thin imaging lens group can balance shortening of the total optical length and correction of aberration.

Preferably, the focal length of the first lens is f1, the combined focal length of the second lens and the third lens is f23, and the following conditions are satisfied: -3.07< f1/f23< -0.63. Therefore, the resolution capability of the three-piece thin imaging lens group is remarkably improved.

Preferably, wherein the focal length of the first lens is f1, the radius of curvature of the object-side surface of the first lens is R1, and the following condition is satisfied: -0.13< f1/R1< 4.95. Thus, distortion can be advantageously reduced.

Preferably, wherein the focal length of the first lens is f1, the radius of curvature of the image-side surface of the first lens is R2, and the following condition is satisfied: -2.41< f1/R2< 1.93. Therefore, the curvature of the image side surface of the first lens element is proper, which is beneficial to shortening the total length of the three-piece thin imaging lens assembly.

Preferably, wherein the focal length of the second lens is f2, the radius of curvature of the object-side surface of the second lens is R3, and the following condition is satisfied: 0.25< f2/R3< 5.64. Therefore, the method is beneficial to reducing the system sensitivity and can effectively improve the production yield.

Preferably, wherein the focal length of the second lens element is f2, the radius of curvature of the image-side surface of the second lens element is R4, and the following condition is satisfied: -2.04< f2/R4< 3.87. Therefore, the peripheral curvature of the image side surface of the second lens can be further reduced, and the characteristic of reducing stray light can be further realized.

Preferably, wherein the focal length of the third lens is f3, the radius of curvature of the object-side surface of the third lens is R5, and the following condition is satisfied: -56.34< f3/R5< 2.58. Thereby, the magnification of imaging is corrected.

Preferably, wherein the focal length of the third lens element is f3, the radius of curvature of the image-side surface of the third lens element is R6, and the following condition is satisfied: -40.72< f3/R6< 0.49. Thereby, the magnification of imaging is corrected.

Preferably, a radius of curvature of the object-side surface of the first lens element is R1, a radius of curvature of the image-side surface of the first lens element is R2, and the following condition is satisfied: -38.2< R1/R2< 276.13. Therefore, the spherical aberration and astigmatism of the three-piece thin imaging lens group can be reduced.

Preferably, a radius of curvature of the object-side surface of the second lens element is R3, a radius of curvature of the image-side surface of the second lens element is R4, and the following condition is satisfied: -5.91< R3/R4< 0.82. Therefore, astigmatism of the three-piece thin imaging lens group can be reduced.

Preferably, a radius of curvature of the object-side surface of the third lens element is R5, a radius of curvature of the image-side surface of the third lens element is R6, and the following condition is satisfied: -2.86< R5/R6< 22.19. Thereby, the curvature configuration of the third lens surface is effectively balanced to achieve a balance between field angle and overall length.

Preferably, the overall focal length of the three-piece thin imaging lens group is f, the distance from the object to the image plane on the optical axis is OTL, and the following conditions are satisfied: 7.71< OTL/f < 17.62. Therefore, the three-piece thin imaging lens group can be kept small and long in focus, and can be mounted on light and thin electronic products.

Preferably, the focal length of the first lens is f1, the focal length of the second lens is f2, and the focal length of the third lens is f3, and the following conditions are satisfied: -4.56< (f1+ f2+ f3)/(f1 f2 f3) < -0.53. Therefore, the shot object can be imaged on the imaging surface well with small aberration and high relative illumination on a short object distance.

Preferably, the object-side surface of the first lens element is concave at a paraxial region thereof. Therefore, the light rays with large angles are effectively collected in an extremely short object distance to receive a wider range of images.

Preferably, the image-side surface of the second lens element is convex at a paraxial region. Therefore, the image resolution of the three-piece thin imaging lens group is improved.

Preferably, an image-side surface of the third lens element is convex at a paraxial region. Thereby, the aberration at a large angle of view is corrected and compensated.

Drawings

FIG. 1A is a schematic view of a three-piece thin imaging lens assembly according to a first embodiment of the present invention.

Fig. 1B is a partially enlarged view of fig. 1A.

Fig. 1C is a graph sequentially showing the curvature of field and distortion aberration of the three-piece thin imaging lens assembly of the first embodiment from left to right.

FIG. 2A is a schematic view of a three-piece thin imaging lens assembly according to a second embodiment of the present invention.

Fig. 2B is a partially enlarged view of fig. 2A.

Fig. 2C is a graph of the field curvature and distortion aberration of the three-piece thin imaging lens assembly of the second embodiment in order from left to right.

FIG. 3A is a schematic view of a three-piece thin imaging lens assembly according to a third embodiment of the present invention.

Fig. 3B is a partially enlarged view of fig. 3A.

Fig. 3C is a graph sequentially showing the curvature of field and distortion aberration of the three-piece thin imaging lens assembly of the third embodiment from left to right.

FIG. 4A is a schematic view of a three-piece thin imaging lens assembly according to a fourth embodiment of the present invention.

Fig. 4B is a partially enlarged view of fig. 4A.

Fig. 4C is a graph sequentially showing the curvature of field and distortion aberration of the three-piece thin imaging lens assembly of the fourth embodiment from left to right.

FIG. 5A is a schematic view of a three-piece thin imaging lens assembly according to a fifth embodiment of the present invention.

Fig. 5B is a partially enlarged view of fig. 5A.

Fig. 5C is a graph showing the curvature of field and distortion aberration of the three-piece thin imaging lens assembly of the fifth embodiment in order from left to right.

FIG. 6A is a schematic view of a three-piece thin imaging lens assembly according to a sixth embodiment of the present invention.

Fig. 6B is a partially enlarged view of fig. 6A.

Fig. 6C is a graph sequentially showing the curvature of field and distortion aberration of the three-piece thin imaging lens assembly of the sixth embodiment from left to right.

FIG. 7A is a schematic view of a three-piece thin imaging lens assembly according to a seventh embodiment of the invention.

Fig. 7B is a partially enlarged view of fig. 7A.

Fig. 7C is a graph sequentially showing the curvature of field and distortion aberration of the three-piece thin imaging lens assembly of the seventh embodiment from left to right.

FIG. 8A is a schematic view of a three-piece thin imaging lens assembly according to an eighth embodiment of the present invention.

Fig. 8B is a partially enlarged view of fig. 8A.

Fig. 8C is a graph sequentially showing the curvature of field and distortion aberration of the three-piece thin imaging lens assembly of the eighth embodiment from left to right.

FIG. 9A is a schematic view of a ninth embodiment of a three-piece thin imaging lens assembly.

Fig. 9B is a partially enlarged view of fig. 9A.

Fig. 9C is a graph showing the curvature of field and distortion aberration of the three-piece thin imaging lens assembly of the ninth embodiment in order from left to right.

Fig. 10A is a schematic view of a three-piece thin imaging lens assembly according to a tenth embodiment of the invention.

Fig. 10B is a partially enlarged view of fig. 10A.

Fig. 10C is a graph of field curvature and distortion aberration curves of the three-piece thin imaging lens assembly of the tenth embodiment in order from left to right.

Fig. 11A is a schematic view of a three-piece thin imaging lens assembly according to the eleventh embodiment of the invention.

Fig. 11B is a partially enlarged view of fig. 11A.

Fig. 11C is a graph of field curvature and distortion aberration curves of the three-piece thin imaging lens assembly of the eleventh embodiment in order from left to right.

Fig. 12A is a schematic view of a three-piece thin imaging lens assembly according to a twelfth embodiment of the invention.

Fig. 12B is a partially enlarged view of fig. 12A.

Fig. 12C is a graph of field curvature and distortion aberration curves of the three-piece thin imaging lens assembly of the twelfth embodiment in order from left to right.

Fig. 13A is a schematic view of a three-piece thin imaging lens assembly according to a thirteenth embodiment of the invention.

Fig. 13B is a partially enlarged view of fig. 13A.

Fig. 13C is a graph sequentially showing the curvature of field and distortion aberration of the three-piece thin imaging lens assembly of the thirteenth embodiment from left to right.

Fig. 14A is a schematic view of a three-piece thin imaging lens assembly according to a fourteenth embodiment of the invention.

Fig. 14B is a partially enlarged view of fig. 14A.

Fig. 14C is a graph sequentially showing the curvature of field and distortion aberration of the three-piece thin imaging lens assembly of the fourteenth embodiment from left to right.

Description of the symbols in the drawings:

100. 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400: aperture

110. 210, 310, 410, 510, 610, 710, 810, 910, 1010, 1110, 1210, 1310, 1410: first lens

111. 211, 311, 411, 511, 611, 711, 811, 911, 1011, 1111, 1211, 1311, 1411: object side surface

112. 212, 312, 412, 512, 612, 712, 812, 912, 1012, 1112, 1212, 1312, 1412: surface of image side

120. 220, 320, 420, 520, 620, 720, 820, 920, 1020, 1120, 1220, 1320, 1420: second lens

121. 221, 321, 421, 521, 621, 721, 821, 921, 1021, 1121, 1221, 1321, 1421: object side surface

122. 222, 322, 422, 522, 622, 722, 822, 922, 1022, 1122, 1222, 1322, 1422: surface of image side

130. 230, 330, 430, 530, 630, 730, 830, 930, 1030, 1130, 1230, 1330, 1430: third lens

131. 231, 331, 431, 531, 631, 731, 831, 931, 1031, 1131, 1231, 1331, 1431: object side surface

132. 232, 332, 432, 532, 632, 732, 832, 932, 1032, 1132, 1232, 1332, 1432: surface of image side

160. 260, 360, 460, 560, 660, 760, 860, 960, 1060, 1160, 1260, 1360, 1460: flat element

170. 270, 370, 470, 570, 670, 770, 870, 970, 1070, 1170, 1270, 1370, 1470: infrared filtering filter

180. 280, 380, 480, 580, 680, 780, 880, 980, 1080, 1180, 1280, 1380, 1480: image plane

190. 290, 390, 490, 590, 690, 790, 890, 990, 1090, 1190, 1290, 1390, 1490: optical axis

f: focal length of three-piece thin imaging lens group

Fno: aperture value of three-piece thin imaging lens group

FOV: maximum field angle in three-piece thin imaging lens group

f 1: focal length of the first lens

f 2: focal length of the second lens

f 3: focal length of the third lens

R1: radius of curvature of object-side surface of first lens

R2: radius of curvature of image-side surface of first lens

R3: radius of curvature of object-side surface of second lens

R4: radius of curvature of image-side surface of second lens

R5: radius of curvature of object-side surface of third lens

R6: radius of curvature of image-side surface of the third lens

OTL: distance between the object and the image forming surface on the optical axis

PTL: distance between image side surface of flat plate element and imaging surface on optical axis

Y: image height of imaging surface

P: the chief ray with high imaging surface image corresponds to the object height at the image side surface of the flat plate element

Detailed Description

The technical solutions of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

First embodiment

Referring to fig. 1A, fig. 1B and fig. 1C, wherein fig. 1A is a schematic view of a three-piece thin imaging lens assembly according to a first embodiment of the invention, and fig. 1B is a partially enlarged view of fig. 1A. Fig. 1C is a graph sequentially showing the curvature of field and distortion aberration of the three-piece thin imaging lens assembly of the first embodiment from left to right. In fig. 1A and 1B, the three-piece thin imaging lens assembly includes, in order from an object side to an image side, a plate element 160, a first lens element 110, an aperture stop 100, a second lens element 120, a third lens element 130, an ir-cut filter 170, and an image plane 180, wherein the three-piece thin imaging lens assembly includes three lens elements (110, 120, and 130). The diaphragm 100 is disposed between the first lens 110 and the second lens 120.

The flat plate element 160 is made of glass material, and is disposed between the object O and the first lens element 110, and does not affect the focal length of the three-piece thin imaging lens assembly.

The first lens element 110 with negative refractive power has an object-side surface 111 being convex at a paraxial region 190 and an image-side surface 112 being concave at a paraxial region 190, and the object-side surface 111 and the image-side surface 112 are aspheric.

The second lens element 120 with positive refractive power has an object-side surface 121 being convex in a paraxial region 190 and an image-side surface 122 being convex in a paraxial region 190, and the object-side surface 121 and the image-side surface 122 are aspheric.

The third lens element 130 with positive refractive power has an object-side surface 131 being convex at a paraxial region 190 and an image-side surface 132 being convex at a paraxial region 190, wherein the third lens element 130 is made of plastic material, and both the object-side surface 131 and the image-side surface 132 are aspheric.

The ir-cut filter 170 is made of glass, and is disposed between the third lens element 130 and the image plane 180 without affecting the focal length of the three-piece thin imaging lens assembly.

The curve equation of the aspherical surface of each lens described above is as follows:

wherein z is a position value referenced to the surface vertex at a position of height h along the optical axis 190; c is a curvature of the lens surface near the optical axis 190 and is an inverse of a curvature radius (R) (c is 1/R), R is a curvature radius of the lens surface near the optical axis 190, h is a perpendicular distance of the lens surface from the optical axis 190, k is a conic coefficient (conic constant), and A, B, C, D, E, F, G, … … are high order aspheric coefficients.

In the first embodiment of the three-piece thin imaging lens assembly, the focal length of the three-piece thin imaging lens assembly is f, the aperture value (f-number) of the three-piece thin imaging lens assembly is Fno, and the maximum field angle (view angle) of the three-piece thin imaging lens assembly is FOV, which has the following values: f ═ 0.47 (millimeters); fno 1.34; and FOV 145.8 (degrees).

In the first embodiment of the three-piece thin imaging lens assembly, a distance from an object O to an imaging plane 180 on the optical axis 190 is OTL, a distance from the image-side surface 162 of the flat-plate element 160 to the imaging plane 180 on the optical axis 190 is PTL, an image height of the imaging plane 180 is Y, an object height at the image-side surface 162 of the flat-plate element 160 corresponding to a chief ray of the image height of the imaging plane 180 is P, and the following conditions are satisfied: PTL 3.71 mm; P/Y is 4.21; OTL/Y5.29 mm.

In the first embodiment of the three-piece thin imaging lens assembly, the focal length of the three-piece thin imaging lens assembly is f, the focal length of the first lens element 110 is f1, and the following conditions are satisfied: f/f1 is-0.55.

In the first embodiment of the three-piece thin imaging lens assembly, the focal length of the three-piece thin imaging lens assembly is f, and the focal length of the second lens element 120 is f2, and the following conditions are satisfied: f/f2 is 0.27.

In the first embodiment of the three-piece thin imaging lens assembly, the focal length of the three-piece thin imaging lens assembly is f, and the focal length of the third lens element 130 is f3, and the following conditions are satisfied: f/f3 is 0.55.

In the first embodiment of the present invention, the focal length of the three-piece thin imaging lens assembly is f, and the combined focal length of the second lens element 120 and the third lens element 130 is f23, and the following conditions are satisfied: f/f23 is 0.67.

In the first embodiment of the three-piece thin imaging lens assembly, the focal length of the first lens element 110 is f1, and the combined focal length of the second lens element 120 and the third lens element 130 is f23, and the following conditions are satisfied: f1/f23 is-1.21.

In the first embodiment of the three-piece thin imaging lens assembly, the focal length of the first lens element 110 is f1, the radius of curvature of the object-side surface 111 of the first lens element 110 is R1, and the following conditions are satisfied: f1/R1 is-0.11.

In the first embodiment of the present three-piece thin imaging lens assembly, the focal length of the first lens element 110 is f1, the radius of curvature of the image-side surface 112 of the first lens element 110 is R2, and the following conditions are satisfied: f1/R2 is-2.01.

In the first embodiment of the three-piece thin imaging lens assembly, the focal length of the second lens element 120 is f2, the radius of curvature of the object-side surface 121 of the second lens element 120 is R3, and the following conditions are satisfied: f2/R3 equals 1.24.

In the first embodiment of the present three-piece thin imaging lens assembly, the focal length of the second lens element 120 is f2, the radius of curvature of the image-side surface 122 of the second lens element 120 is R4, and the following conditions are satisfied: f2/R4 is-0.73.

In the first embodiment of the three-piece thin imaging lens assembly, the focal length of the third lens element 130 is f3, the radius of curvature of the object-side surface 131 of the third lens element 130 is R5, and the following conditions are satisfied: f3/R5 equals 1.10.

In the first embodiment of the present three-piece thin imaging lens assembly, the focal length of the third lens element 130 is f3, the radius of curvature of the image-side surface 132 of the third lens element 130 is R6, and the following conditions are satisfied: f3/R6 is-0.93.

In the first embodiment of the present invention, the radius of curvature of the object-side surface 111 of the first lens element 110 is R1, the radius of curvature of the image-side surface 112 of the first lens element 110 is R2, and the following conditions are satisfied: R1/R2 ═ 18.66.

In the first embodiment of the present invention, the radius of curvature of the object-side surface 121 of the second lens element 120 is R3, the radius of curvature of the image-side surface 122 of the second lens element 120 is R4, and the following conditions are satisfied: R3/R4 ═ 0.59.

In the first embodiment of the present invention, the radius of curvature of the object-side surface 131 of the third lens element 130 is R5, the radius of curvature of the image-side surface 132 of the third lens element 130 is R6, and the following conditions are satisfied: R5/R6 ═ 0.84.

Further, refer to the following Table 1 and Table 2.

Table 1 shows the detailed structural data of the first embodiment in fig. 1A and 1B, wherein the units of the radius of curvature, the thickness and the focal length are mm, and surfaces 0-12 sequentially represent the surfaces from the object side to the image side. Table 2 shows aspheric data in the first embodiment, where k denotes a cone coefficient in the aspheric curve equation, and A, B, C, D, E, F, G and … … denote higher-order aspheric coefficients. In addition, the following tables of the embodiments correspond to the schematic diagrams and aberration graphs 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, which is not repeated herein.

Second embodiment

Referring to fig. 2A, fig. 2B and fig. 2C, wherein fig. 2A is a schematic view of a three-piece thin imaging lens assembly according to a second embodiment of the invention, and fig. 2B is a partial enlarged view of fig. 2A. Fig. 2C is a graph of the field curvature and distortion aberration of the three-piece thin imaging lens assembly of the second embodiment in order from left to right. In fig. 2A and 2B, the three-piece thin imaging lens assembly includes, in order from an object side to an image side, a plate element 260, a first lens element 210, an aperture stop 200, a second lens element 220, a third lens element 230, an ir-cut filter 270, and an image plane 280, wherein the three-piece thin imaging lens assembly includes three lens elements (210, 220, 230). The diaphragm 200 is disposed between the first lens 210 and the second lens 220.

The flat plate element 260 is made of glass, is disposed between the object O and the first lens element 210, and does not affect the focal length of the three-piece thin imaging lens assembly.

The first lens element 210 with negative refractive power has an object-side surface 211 being concave at a paraxial region 290 thereof and an image-side surface 212 being concave at a paraxial region 290 thereof, and the object-side surface 211 and the image-side surface 212 are aspheric.

The second lens element 220 with positive refractive power has an object-side surface 221 being convex at a paraxial region 290 thereof and an image-side surface 222 being convex at a paraxial region 290 thereof, wherein the object-side surface 221 and the image-side surface 222 are aspheric.

The third lens element 230 with positive refractive power has an object-side surface 231 being convex at a paraxial region 290 and an image-side surface 232 being convex at a paraxial region 290, and both the object-side surface 231 and the image-side surface 232 are aspheric.

The ir-cut filter 270 is made of glass, and is disposed between the third lens element 230 and the image plane 280 without affecting the focal length of the three-piece thin imaging lens assembly.

Further, the following Table 3 and Table 4 are referred to.

In the second embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be derived from tables 3 and 4:

third embodiment

Referring to fig. 3A, fig. 3B and fig. 3C, wherein fig. 3A is a schematic view of a three-piece thin imaging lens assembly according to a third embodiment of the invention, and fig. 3B is a partial enlarged view of fig. 3A. Fig. 3C is a graph sequentially showing the curvature of field and distortion aberration of the three-piece thin imaging lens assembly of the third embodiment from left to right. In fig. 3A and 3B, the three-piece thin imaging lens assembly includes, in order from an object side to an image side, a plate element 360, a first lens element 310, an aperture stop 300, a second lens element 320, a third lens element 330, an ir-cut filter 370 and an image plane 380, wherein the three lens elements (310, 320, 330) have refractive power. The diaphragm 300 is disposed between the first lens 310 and the second lens 320.

The flat plate element 360 is made of glass, and is disposed between the object O and the first lens element 310, and does not affect the focal length of the three-piece thin imaging lens assembly.

The first lens element 310 with negative refractive power has an object-side surface 311 being concave in a paraxial region 390 thereof and an image-side surface 312 being concave in a paraxial region 390 thereof, and the object-side surface 311 and the image-side surface 312 are aspheric.

The second lens element 320 with positive refractive power has an object-side surface 321 being convex at a paraxial region 390, and an image-side surface 322 being convex at a paraxial region 390, wherein the object-side surface 321 and the image-side surface 322 are aspheric.

The third lens element 330 with positive refractive power has an object-side surface 331 being convex at a paraxial region 390, an image-side surface 332 being convex at a paraxial region 390, and both the object-side surface 331 and the image-side surface 332 being aspheric.

The ir-cut filter 370 is made of glass and disposed between the third lens element 330 and the image plane 380 without affecting the focal length of the three-piece thin imaging lens assembly.

Further, the following Table 5 and Table 6 were referred to.

In the third embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be derived from tables 5 and 6:

fourth embodiment

Referring to fig. 4A, fig. 4B and fig. 4C, wherein fig. 4A is a schematic view of a three-piece thin imaging lens assembly according to a fourth embodiment of the present invention, and fig. 4B is a partially enlarged view of fig. 4A. Fig. 4C is a graph sequentially showing the curvature of field and distortion aberration of the three-piece thin imaging lens assembly of the fourth embodiment from left to right. In fig. 4A and 4B, the three-piece thin imaging lens assembly includes, in order from an object side to an image side, a plate element 460, a first lens element 410, an aperture stop 400, a second lens element 420, a third lens element 430, an ir-cut filter 470 and an image plane 480, wherein the three lens elements (410, 420 and 430) have refractive power. The diaphragm 400 is disposed between the first lens 410 and the second lens 420.

The flat plate element 460 is made of glass material, and is disposed between the object O and the first lens element 410, and does not affect the focal length of the three-piece thin imaging lens assembly.

The first lens element 410 with negative refractive power has an object-side surface 411 being concave at a paraxial region 490 thereof and an image-side surface 412 being concave at a paraxial region 490 thereof, and the object-side surface 411 and the image-side surface 412 are aspheric.

The second lens element 420 with positive refractive power has an object-side surface 421 being convex at a paraxial region 490 thereof and an image-side surface 422 being concave at a paraxial region 490 thereof, wherein the object-side surface 421 and the image-side surface 422 are aspheric.

The third lens element 430 with positive refractive power has an object-side surface 431 being convex at a paraxial region 490 thereof and an image-side surface 432 being convex at a paraxial region 490 thereof, and the object-side surface 431 and the image-side surface 432 are aspheric.

The ir-cut filter 470 is made of glass, and is disposed between the third lens element 430 and the image plane 480 without affecting the focal length of the three-piece thin imaging lens assembly.

Further, the following Table 7 and Table 8 are referred to.

In the fourth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be derived from tables 7 and 8:

fifth embodiment

Referring to fig. 5A, fig. 5B and fig. 5C, wherein fig. 5A is a schematic view of a three-piece thin imaging lens assembly according to a fifth embodiment of the present invention, and fig. 5B is a partial enlarged view of fig. 5A. Fig. 5C is a graph showing the curvature of field and distortion aberration of the three-piece thin imaging lens assembly of the fifth embodiment in order from left to right. In fig. 5A and 5B, the three-piece thin imaging lens assembly includes, in order from an object side to an image side, a plate element 560, a first lens element 510, an aperture stop 500, a second lens element 520, a third lens element 530, an ir-cut filter 570 and an image plane 580, wherein the three lens elements (510, 520, 530) have refractive power. The diaphragm 500 is disposed between the first lens 510 and the second lens 520.

The flat plate element 560 is made of glass material, and is disposed between the object O and the first lens element 510, and does not affect the focal length of the three-piece thin imaging lens assembly.

The first lens element 510 with negative refractive power has an object-side surface 511 being concave in a paraxial region 590, an image-side surface 512 being convex in a paraxial region 590, and both the object-side surface 511 and the image-side surface 512 being aspheric.

The second lens element 520 with positive refractive power has an object-side surface 521 being convex in a paraxial region 590, and an image-side surface 522 being convex in a paraxial region 590, and the object-side surface 521 and the image-side surface 522 are aspheric.

The third lens element 530 with negative refractive power has an object-side surface 531 being convex at a paraxial region 590 and an image-side surface 532 being concave at a paraxial region 590, and both the object-side surface 531 and the image-side surface 532 are aspheric.

The ir-cut filter 570 is made of glass, and is disposed between the third lens element 530 and the image plane 580 without affecting the focal length of the three-piece thin imaging lens assembly.

Further, the following table 9 and table 10 are referred to.

In the fifth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be derived from tables 9 and 10:

sixth embodiment

Referring to fig. 6A, 6B and 6C, fig. 6A is a schematic view of a three-piece thin imaging lens assembly according to a sixth embodiment of the present invention, and fig. 6B is a partially enlarged view of fig. 6A. Fig. 6C is a graph sequentially showing the curvature of field and distortion aberration of the three-piece thin imaging lens assembly of the sixth embodiment from left to right. In fig. 6A and 6B, the three-piece thin imaging lens assembly includes, in order from an object side to an image side, a plate element 660, a first lens element 610, an aperture stop 600, a second lens element 620, a third lens element 630, an ir-cut filter 670 and an image plane 680, wherein the three lens elements (610, 620, 630) have refractive power. The diaphragm 600 is disposed between the first lens 610 and the second lens 620.

The flat plate element 660 is made of glass, and is disposed between the object O and the first lens element 610, and does not affect the focal length of the three-piece thin imaging lens assembly.

The first lens element 610 with negative refractive power has an object-side surface 611 being concave at a paraxial region 690 and an image-side surface 612 being concave at a paraxial region 690, and the object-side surface 611 and the image-side surface 612 are aspheric.

The second lens element 620 with positive refractive power has an object-side surface 621 being convex in a paraxial region 690 thereof and an image-side surface 622 being convex in a paraxial region 690 thereof, and the object-side surface 621 and the image-side surface 622 thereof are aspheric.

The third lens element 630 with positive refractive power has an object-side surface 631 being convex in a paraxial region 690 thereof and an image-side surface 632 being convex in a paraxial region 690 thereof, wherein the object-side surface 631 and the image-side surface 632 are aspheric.

The ir-cut filter 670 is made of glass, and is disposed between the third lens element 630 and the image plane 680 without affecting the focal length of the three-piece thin imaging lens assembly.

Further, the following table 11 and table 12 are referred to.

In the sixth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be derived from tables 11 and 12:

seventh embodiment

Referring to fig. 7A, 7B and 7C, fig. 7A is a schematic view of a three-piece thin imaging lens assembly according to a seventh embodiment of the invention, and fig. 7B is a partially enlarged view of fig. 7A. Fig. 7C is a graph sequentially showing the curvature of field and distortion aberration of the three-piece thin imaging lens assembly of the seventh embodiment from left to right. In fig. 7A and 7B, the three-piece thin imaging lens assembly includes, in order from an object side to an image side, a plate element 760, a first lens element 710, an aperture stop 700, a second lens element 720, a third lens element 730, an ir-cut filter 770 and an image plane 780, wherein the three lens elements (710, 720 and 730) have refractive power. The diaphragm 700 is disposed between the first lens 710 and the second lens 720.

The plate element 760 is made of glass, and is disposed between a subject O and the first lens element 710, and does not affect the focal length of the three-piece thin imaging lens assembly.

The first lens element 710 with negative refractive power has an object-side surface 711 being concave at a paraxial region 790, an image-side surface 712 being concave at a paraxial region 790, and both the object-side surface 711 and the image-side surface 712 being aspheric.

The second lens element 720 with positive refractive power has an object-side surface 721 being convex at a paraxial region 790, an image-side surface 722 being convex at a paraxial region 790, and both the object-side surface 721 and the image-side surface 722 being aspheric.

The third lens element 730 with positive refractive power has an object-side surface 731 being convex in a paraxial region 790, an image-side surface 732 being concave in a paraxial region 790, and both the object-side surface 731 and the image-side surface 732 being aspheric.

The ir-cut filter 770 is made of glass and disposed between the third lens element 730 and the image plane 780 without affecting the focal length of the three-piece thin imaging lens assembly.

Further, the following table 13 and table 14 are referred to.

In the seventh embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be derived from the coordination tables 13 and 14:

eighth embodiment

Referring to fig. 8A, 8B and 8C, fig. 8A is a schematic view of a three-piece thin imaging lens assembly according to an eighth embodiment of the present invention, and fig. 8B is a partially enlarged view of fig. 8A. Fig. 8C is a graph sequentially showing the curvature of field and distortion aberration of the three-piece thin imaging lens assembly of the eighth embodiment from left to right. In fig. 8A and 8B, the three-piece thin imaging lens assembly includes, in order from an object side to an image side, a plate element 860, a first lens element 810, an aperture stop 800, a second lens element 820, a third lens element 830, an ir-cut filter 870 and an image plane 880, wherein the three lens elements (810, 820 and 830) have refractive power. The diaphragm 800 is disposed between the first lens 810 and the second lens 820.

The flat plate element 860 is made of glass material, and is disposed between the object O and the first lens element 810, and does not affect the focal length of the three-piece thin imaging lens assembly.

The first lens element 810 with negative refractive power has an object-side surface 811 being concave in a paraxial region 890 thereof and an image-side surface 812 being concave in a paraxial region 890 thereof, wherein the object-side surface 811 and the image-side surface 812 are aspheric.

The second lens element 820 with positive refractive power has an object-side surface 821 being convex in a paraxial region 890 thereof and an image-side surface 822 being convex in a paraxial region 890 thereof, wherein the object-side surface 821 and the image-side surface 822 are aspheric.

The third lens element 830 with positive refractive power has an object-side surface 831 being concave in a paraxial region 890 thereof and an image-side surface 832 being convex in a paraxial region 890 thereof, wherein the object-side surface 831 and the image-side surface 832 are aspheric.

The ir-cut filter 870 is made of glass and disposed between the third lens element 830 and the image plane 880, and does not affect the focal length of the three-piece thin imaging lens assembly.

Further, the following table 15 and table 16 are referred to.

In the eighth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be derived from the coordination tables 15 and 16:

ninth embodiment

Referring to fig. 9A, 9B and 9C, fig. 9A is a schematic view of a three-piece thin imaging lens assembly according to a ninth embodiment of the invention, and fig. 9B is a partial enlarged view of fig. 9A. Fig. 9C is a graph showing the curvature of field and distortion aberration of the three-piece thin imaging lens assembly of the ninth embodiment in order from left to right. In fig. 9A and 9B, the three-piece thin imaging lens assembly includes, in order from an object side to an image side, a plate element 960, a first lens element 910, an aperture stop 900, a second lens element 920, a third lens element 930, an ir-cut filter 970 and an image plane 980, wherein the three lens elements (910, 920, 930) have refractive power. The aperture stop 900 is disposed between the first lens 910 and the second lens 920.

The plate element 960 is made of glass material, and is disposed between the object O and the first lens element 910, and does not affect the focal length of the three-piece thin imaging lens assembly.

The first lens element 910 with negative refractive power has an object-side surface 911 being concave at a paraxial region 990 and an image-side surface 912 being concave at a paraxial region 990, and the object-side surface 911 and the image-side surface 912 are aspheric.

The second lens element 920 with positive refractive power has an object-side surface 921 being convex at a paraxial region 990 and an image-side surface 922 being convex at a paraxial region 990, wherein the second lens element 920 is made of plastic material, and both the object-side surface 921 and the image-side surface 922 are aspheric.

The third lens element 930 with positive refractive power has an object-side surface 931 being concave at a paraxial region 990 and an image-side surface 932 being convex at a paraxial region 990, and is made of plastic material.

The ir-cut filter 970 is made of glass material, and is disposed between the third lens element 930 and the image plane 980 without affecting the focal length of the three-piece thin imaging lens assembly.

Further, the following table 17 and table 18 are referred to.

In the ninth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be derived from the tables 17 and 18:

tenth embodiment

Referring to fig. 10A, 10B and 10C, fig. 10A is a schematic view of a three-piece thin imaging lens assembly according to a tenth embodiment of the invention, and fig. 10B is a partially enlarged view of fig. 10A. Fig. 10C is a graph of field curvature and distortion aberration curves of the three-piece thin imaging lens assembly of the tenth embodiment in order from left to right. In fig. 10A and 10B, the three-piece thin imaging lens assembly includes, in order from an object side to an image side, a plate element 1060, a first lens element 1010, an aperture stop 1000, a second lens element 1020, a third lens element 1030, an ir-cut filter 1070 and an image plane 1080, wherein the three-piece thin imaging lens assembly includes three lens elements (1010, 1020, 1030). An aperture stop 1000 is disposed between the first lens 1010 and the second lens 1020.

The flat plate element 1060 is made of glass material, and is disposed between the object O and the first lens element 1010, and does not affect the focal length of the three-piece thin imaging lens assembly.

The first lens element 1010 with negative refractive power has an object-side surface 1011 being concave at a paraxial region 1090, an image-side surface 1012 being concave at a paraxial region 1090, and both the object-side surface 1011 and the image-side surface 1012 being aspheric.

The second lens element 1020 with positive refractive power has an object-side surface 1021 being convex in a paraxial region 1090 thereof and an image-side surface 1022 being convex in a paraxial region 1090 thereof, wherein the object-side surface 1021 and the image-side surface 1022 are aspheric.

The third lens element 1030 with positive refractive power has an object-side surface 1031 being convex in a paraxial region 1090, an image-side surface 1032 being convex in a paraxial region 1090, and both the object-side surface 1031 and the image-side surface 1032 being aspheric.

The ir-cut filter 1070 is made of glass and is disposed between the third lens element 1030 and the imaging plane 1080 without affecting the focal length of the three-piece thin imaging lens assembly.

Further, the following table 19 and table 20 are referred to.

In the tenth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be derived from the coordination tables 19 and 20:

eleventh embodiment

Referring to fig. 11A, fig. 11B and fig. 11C, wherein fig. 11A is a schematic view of a three-piece thin imaging lens assembly according to an eleventh embodiment of the invention, and fig. 11B is a partial enlarged view of fig. 11A. Fig. 11C is a graph of field curvature and distortion aberration curves of the three-piece thin imaging lens assembly of the eleventh embodiment in order from left to right. In fig. 11A and 11B, the three-piece thin imaging lens assembly includes, in order from an object side to an image side, a flat plate element 1160, a first lens element 1110, an aperture stop 1100, a second lens element 1120, a third lens element 1130, an ir-cut filter 1170, and an image plane 1180, wherein the three lens elements (1110, 1120, 1130) have refractive power. The diaphragm 1100 is disposed between the first lens 1110 and the second lens 1120.

The flat plate element 1160 is made of glass, and is disposed between a subject O and the first lens element 1110, and does not affect the focal length of the three-piece thin imaging lens assembly.

The first lens element 1110 with negative refractive power has an object-side surface 1111 being concave at a paraxial region 1190 and an image-side surface 1112 being convex at a paraxial region 1190, and both the object-side surface 1111 and the image-side surface 1112 being aspheric.

The second lens element 1120 with positive refractive power has an object-side surface 1121 being convex at a paraxial region 1190 thereof and an image-side surface 1122 being concave at a paraxial region 1190 thereof, and both the object-side surface 1121 and the image-side surface 1122 being aspheric.

The third lens element 1130 with positive refractive power is made of plastic material, and has an object-side surface 1131 being convex at a paraxial region 1190 and an image-side surface 1132 being convex at a paraxial region 1190, wherein the object-side surface 1131 and the image-side surface 1132 are aspheric.

The ir-cut filter 1170 is made of glass, and is disposed between the third lens element 1130 and the image plane 1180 without affecting the focal length of the three-piece thin imaging lens assembly.

The following table 21 and table 22 are referred to in combination.

In the eleventh embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be derived from the coordination table 21 and the table 22:

twelfth embodiment

Referring to fig. 12A, 12B and 12C, fig. 12A is a schematic view of a three-piece thin imaging lens assembly according to a twelfth embodiment of the invention, and fig. 12B is a partial enlarged view of fig. 12A. Fig. 12C is a graph of field curvature and distortion aberration curves of the three-piece thin imaging lens assembly of the twelfth embodiment in order from left to right. In fig. 12A and 12B, the three-piece thin imaging lens assembly includes, in order from an object side to an image side, a plate element 1260, a first lens element 1210, an aperture stop 1200, a second lens element 1220, a third lens element 1230, an ir-cut filter 1270 and an image plane 1280, wherein the three lens elements with refractive power of the three-piece thin imaging lens assembly (1210, 1220, 1230). The aperture 1200 is disposed between the first lens 1210 and the second lens 1220.

The plate element 1260 is made of glass material, and is disposed between a subject O and the first lens element 1210, and does not affect the focal length of the three-piece thin imaging lens assembly.

The first lens element 1210 with negative refractive power has an object-side surface 1211 being concave at a paraxial region 1290 and an image-side surface 1212 being convex at a paraxial region 1290, and both the object-side surface 1211 and the image-side surface 1212 are aspheric.

The second lens element 1220 with positive refractive power has an object-side surface 1221 being convex at a paraxial region 1290, an image-side surface 1222 being convex at a paraxial region 1290, and both the object-side surface 1221 and the image-side surface 1222 being aspheric.

The third lens element 1230 with positive refractive power has an object-side surface 1231 being convex at a paraxial region 1290 and an image-side surface 1232 being convex at a paraxial region 1290, wherein the object-side surface 1231 and the image-side surface 1232 are aspheric.

The ir-cut filter 1270 is made of glass and is disposed between the third lens 1230 and the image plane 1280 without affecting the focal length of the three-piece thin imaging lens assembly.

Further, the following table 23 and table 24 are referred to.

In the twelfth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be derived from the coordination table 23 and the table 24:

thirteenth embodiment

Referring to fig. 13A, 13B and 13C, fig. 13A is a schematic view of a three-piece thin imaging lens assembly according to a thirteenth embodiment of the invention, and fig. 13B is a partially enlarged view of fig. 13A. Fig. 13C is a graph sequentially showing the curvature of field and distortion aberration of the three-piece thin imaging lens assembly of the thirteenth embodiment from left to right. In fig. 13A and 13B, the three-piece thin imaging lens assembly includes, in order from an object side to an image side, a plate element 1360, a first lens element 1310, an aperture stop 1300, a second lens element 1320, a third lens element 1330, an ir-cut filter 1370, and an image plane 1380, wherein the three-piece thin imaging lens assembly includes three lens elements (1310, 1320, 1330). The aperture 1300 is disposed between the first lens 1310 and the second lens 1320.

The flat element 1360 is made of glass material, and is disposed between the object O and the first lens element 1310, and does not affect the focal length of the three-piece thin imaging lens assembly.

The first lens element 1310 with negative refractive power has an object-side surface 1311 being concave at a paraxial region 1390 and an image-side surface 1312 being concave at a paraxial region 1390, and the object-side surface 1311 and the image-side surface 1312 are aspheric.

The second lens element 1320 with positive refractive power has an object-side surface 1321 being convex at a paraxial region 1390 and an image-side surface 1322 being convex at a paraxial region 1390, wherein the object-side surface 1321 and the image-side surface 1322 are aspheric.

The third lens element 1330 with positive refractive power is made of plastic material, and has an object-side surface 1331 being concave at a paraxial region 1390 and an image-side surface 1332 being convex at a paraxial region 1390, wherein the object-side surface 1331 and the image-side surface 1332 are aspheric.

The ir-cut filter 1370 is made of glass, and is disposed between the third lens element 1330 and the imaging plane 1380 without affecting the focal length of the three-piece thin imaging lens assembly.

Further, the following table 25 and table 26 are referred to.

In the thirteenth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be derived from the coordination tables 25 and 26:

fourteenth embodiment

Referring to fig. 14A, 14B and 14C, fig. 14A is a schematic view of a three-piece thin imaging lens assembly according to a fourteenth embodiment of the invention, and fig. 14B is a partially enlarged view of fig. 14A. Fig. 14C is a graph sequentially showing the curvature of field and distortion aberration of the three-piece thin imaging lens assembly of the fourteenth embodiment from left to right. In fig. 14A and 14B, the three-piece thin imaging lens assembly includes, in order from an object side to an image side, a plate element 1460, a first lens element 1410, an aperture 1400, a second lens element 1420, a third lens element 1430, an ir-cut filter 1470 and an image plane 1480, wherein the three lens elements (1410, 1420, 1430) have refractive power. The aperture 1400 is disposed between the first lens 1410 and the second lens 1420.

The flat plate element 1460 is made of glass material, and is disposed between a subject O and the first lens element 1410, and does not affect the focal length of the three-piece thin imaging lens assembly.

The first lens element 1410 with negative refractive power has an object-side surface 1411 being convex at a paraxial region 1490 thereof and an image-side surface 1412 being concave at a paraxial region 1490 thereof, and the object-side surface 1411 and the image-side surface 1412 are both aspheric.

The second lens element 1420 with positive refractive power has an object-side surface 1421 being convex at a paraxial region 1490 thereof and an image-side surface 1422 being convex at a paraxial region 1490 thereof, wherein the object-side surface 1421 and the image-side surface 1422 are aspheric.

The third lens element 1430 with positive refractive power has an object-side surface 1431 being convex in a paraxial region 1490 and an image-side surface 1432 being convex in a paraxial region 1490, wherein the object-side surface 1431 and the image-side surface 1432 are aspheric.

The ir-cut filter 1470 is made of glass, and is disposed between the third lens element 1430 and the imaging plane 1480 without affecting the focal length of the three-piece thin imaging lens assembly.

Further, the following table 27 and table 28 are referred to.

In a fourteenth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.

The following data can be derived from the coordination table 27 and the table 28:

the three-piece thin imaging lens group provided by the invention has the advantages that the material of the lens can be plastic or glass, the production cost can be effectively reduced when the material of the lens is plastic, and in addition, the degree of freedom of the refractive power configuration of the three-piece thin imaging lens group can be increased when the material of the lens is glass. In addition, the object side surface and the image side surface of the lens in the three-piece thin imaging lens group can be aspheric, the aspheric surface can be easily made into shapes other than a spherical surface, more control variables are obtained to reduce the aberration, and the number of the lens is further reduced, so that the total length of the three-piece thin imaging lens group can be effectively reduced.

In the three-piece thin imaging lens assembly provided by the invention, regarding the lens with refractive power, if the lens surface is a convex surface and the position of the convex surface is not defined, the lens surface is a convex surface at a position close to the optical axis; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at the paraxial region.

In summary, the above embodiments are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A three-piece thin imaging lens assembly, in order from an object side to an image side comprising:

a plate element made of glass;

the first lens element with negative refractive power has at least one of an object-side surface and an image-side surface thereof being aspheric;

an aperture;

the second lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof, and at least one of the object-side surface and the image-side surface thereof being aspheric; and

the third lens element with refractive power has at least one of an object-side surface and an image-side surface thereof being aspheric;

2. The three-piece thin imaging lens assembly of claim 1, wherein the overall focal length of the three-piece thin imaging lens assembly is f, the focal length of the first lens element is f1, and the following conditions are satisfied: -0.86< f/f1< -0.22.

3. The three-piece thin imaging lens assembly of claim 1, wherein the overall focal length of the three-piece thin imaging lens assembly is f, and the focal length of the second lens element is f2, wherein the following conditions are satisfied: 0.05< f/f2< 1.27.

4. The three-piece thin imaging lens assembly of claim 1, wherein the overall focal length of the three-piece thin imaging lens assembly is f, the focal length of the third lens element is f3, and the following conditions are satisfied: -0.17< f/f3< 0.82.

5. The three-piece thin imaging lens assembly of claim 1, wherein the overall focal length of the three-piece thin imaging lens assembly is f, and the combined focal length of the second lens element and the third lens element is f23, and the following conditions are satisfied: 0.45< f/f23< 1.04.

6. The three-piece thin imaging lens assembly of claim 1, wherein the first lens element has a focal length f1, and the combined focal length of the second and third lens elements is f23, wherein the following conditions are satisfied: -3.07< f1/f23< -0.63.

7. The three-piece thin imaging lens assembly of claim 1, wherein the first lens element has a focal length f1, and the object-side surface of the first lens element has a radius of curvature R1, wherein the following conditions are satisfied: -0.13< f1/R1< 4.95.

8. The three-piece thin imaging lens assembly of claim 1, wherein the first lens element has a focal length of f1 and the first lens element has a radius of curvature on the image-side surface of R2, wherein the following conditions are satisfied: -2.41< f1/R2< 1.93.

9. The three-piece thin imaging lens assembly of claim 1, wherein the second lens element has a focal length of f2, and the object-side surface of the second lens element has a radius of curvature of R3, wherein the following conditions are satisfied: 0.25< f2/R3< 5.64.

10. The three-piece thin imaging lens assembly of claim 1, wherein the second lens element has a focal length of f2 and a radius of curvature of the image-side surface of the second lens element is R4, wherein the following conditions are satisfied: -2.04< f2/R4< 3.87.

11. The three-piece thin imaging lens assembly of claim 1, wherein the third lens element has a focal length f3, and the object-side surface of the third lens element has a radius of curvature R5, wherein the following conditions are satisfied: -56.34< f3/R5< 2.58.

12. The three-piece thin imaging lens assembly of claim 1, wherein the third lens element has a focal length f3 and a radius of curvature of the image-side surface of the third lens element is R6, wherein the following conditions are satisfied: -40.72< f3/R6< 0.49.

13. The three-piece thin imaging lens assembly of claim 1, wherein the radius of curvature of the object-side surface of the first lens element is R1, and the radius of curvature of the image-side surface of the first lens element is R2, wherein the following conditions are satisfied: -38.2< R1/R2< 276.13.

14. The three-piece thin imaging lens assembly of claim 1, wherein the radius of curvature of the object-side surface of the second lens element is R3, and the radius of curvature of the image-side surface of the second lens element is R4, wherein the following conditions are satisfied: -5.91< R3/R4< 0.82.

15. The three-piece thin imaging lens assembly of claim 1, wherein the radius of curvature of the object-side surface of the third lens element is R5, and the radius of curvature of the image-side surface of the third lens element is R6, wherein the following conditions are satisfied: -2.86< R5/R6< 22.19.

16. The three-piece thin imaging lens assembly of claim 1, wherein the overall focal length of the three-piece thin imaging lens assembly is f, the distance from the object to the image plane on the optical axis is OTL, and the following conditions are satisfied: 7.71< OTL/f < 17.62.

17. The three-piece thin imaging lens assembly of claim 1, wherein the first lens element has a focal length of f1, the second lens element has a focal length of f2, and the third lens element has a focal length of f3, wherein the following conditions are satisfied: -4.56< (f1+ f2+ f3)/(f1 f2 f3) < -0.53.

18. The three-piece thin imaging lens assembly of claim 1, wherein the object-side surface of the first lens element is concave at a paraxial region.

19. The three-piece thin imaging lens assembly of claim 1, wherein the image-side surface of the second lens element is convex at a paraxial region.

20. The three-piece thin imaging lens assembly of claim 1, wherein the image-side surface of the third lens element is convex at a paraxial region.