阅读说明：本技术 六片式成像镜片组 (Six-piece imaging lens group ) 是由 柯贤勅 于 2020-03-19 设计创作，主要内容包括：本发明公开了一种六片式成像镜片组,由物侧至像侧依序包含：一光圈；一第一透镜,具有正屈折力；一第二透镜,具有负屈折力；一第三透镜,具有正屈折力；一第四透镜,具有负屈折力；一第五透镜,具有正屈折力；一第六透镜,具有负屈折力。藉以达到一种兼具大光圈、高画质以及小型化特性的六片式成像镜片组。(The invention discloses a six-piece imaging lens group, which comprises the following components in sequence from an object side to an image side: an aperture; a first lens element with positive refractive power; a second lens element with negative refractive power; a third lens element with positive refractive power; a fourth lens element with negative refractive power; a fifth lens element with positive refractive power; a sixth lens element with negative refractive power. Thereby achieving a six-lens imaging lens set with large aperture, high image quality and miniaturization.)

1. Six formula formation of image lens groups, include an aperture and an optical group that comprises six lens elements, its characterized in that: in order from the object side to the image side:

the aperture;

a first lens element with positive refractive power having an object-side surface being convex at a paraxial region thereof and an image-side surface being concave at a paraxial region thereof, wherein at least one of the object-side surface and the image-side surface of the first lens element is aspheric;

a second lens element with negative refractive power having an object-side surface being convex at a paraxial region thereof and an image-side surface being concave at a paraxial region thereof, wherein at least one of the object-side surface and the image-side surface of the second lens element is aspheric;

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

a fourth lens element with negative refractive power having an object-side surface being convex at a paraxial region thereof and an image-side surface being concave at a paraxial region thereof, at least one of the object-side surface and the image-side surface of the fourth lens element being aspheric, and at least one of the object-side surface and the image-side surface of the fourth lens element having at least one inflection point;

a fifth lens element with positive refractive power having an object-side surface being convex at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof, wherein at least one of the object-side surface and the image-side surface of the fifth lens element is aspheric and has at least one inflection point; and

the sixth lens element with negative refractive power has an object-side surface being concave at a paraxial region thereof, and an image-side surface being concave at a paraxial region thereof, wherein at least one of the object-side surface and the image-side surface of the sixth lens element is aspheric, and at least one of the object-side surface and the image-side surface of the sixth lens element has at least one inflection point.

2. The six-piece imaging lens assembly of claim 1, wherein: the focal length of the first lens is f1, the focal length of the second lens is f2, and the following conditions are satisfied: -0.6 < f1/f2 < -0.3.

3. The six-piece imaging lens assembly of claim 1, wherein: the focal length of the second lens is f2, the focal length of the third lens is f3, and the following conditions are met: -0.03 < f2/f3 < 0.43.

4. The six-piece imaging lens assembly of claim 1, wherein: the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the following conditions are met: -81 < f3/f4 < 3.1.

5. The six-piece imaging lens assembly of claim 1, wherein: the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, and the following conditions are met: 13.6 < f4/f5 < -3.3.

6. The six-piece imaging lens assembly of claim 1, wherein: the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, and the following conditions are satisfied: -1.7 < f5/f6 < -0.75.

7. The six-piece imaging lens assembly of claim 1, wherein: 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: -0.70 < f1/f23 < -0.30.

8. The six-piece imaging lens assembly of claim 1, wherein: the focal length of the second lens and the third lens is f23, the focal length of the fourth lens is f4, and the following conditions are satisfied: f23/f4 is more than 0.1 and less than 0.85.

9. The six-piece imaging lens assembly of claim 1, wherein: the combined focal length of the second lens and the third lens is f23, the combined focal length of the fourth lens and the fifth lens is f45, and the following conditions are satisfied: -3.0 < f23/f45 < -1.0.

10. The six-piece imaging lens assembly of claim 1, wherein: the combined focal length of the fourth lens and the fifth lens is f45, the focal length of the sixth lens is f6, and the following conditions are satisfied: -1.9 < f45/f6 < -0.85.

11. The six-piece imaging lens assembly of claim 1, wherein: the combined focal length of the first lens and the second lens is f12, the combined focal length of the third lens and the fourth lens is f34, and the following conditions are satisfied: -0.65 < f12/f34 < -0.15.

12. The six-piece imaging lens assembly of claim 1, wherein: the combined focal length of the third lens and the fourth lens is f34, the combined focal length of the fifth lens and the sixth lens is f56, and the following conditions are met: -1.25 < f34/f56 < -0.15.

13. The six-piece imaging lens assembly of claim 1, wherein: the combined focal length of the first lens, the second lens and the third lens is f123, and the combined focal length of the fourth lens and the fifth lens is f45, and the following conditions are satisfied: f123/f45 is more than 1.0 and less than 2.5.

14. The six-piece imaging lens assembly of claim 1, wherein: the combined focal length of the first lens, the second lens and the third lens is f123, and the combined focal length of the fourth lens, the fifth lens and the sixth lens is f456, and the following conditions are satisfied: -0.35 < f123/f456 < 0.15.

15. The six-piece imaging lens assembly of claim 1, wherein: the focal length of the first lens is f1, the combined focal length of the second lens, the third lens and the fourth lens is f234, and the following conditions are satisfied: -1.05 < f1/f234 < -0.45.

16. The six-piece imaging lens assembly of claim 1, wherein: the combined focal length of the second lens, the third lens and the fourth lens is f234, and the combined focal length of the fifth lens and the sixth lens is f56, and the following conditions are satisfied: -0.55 < f234/f56 < -0.15.

17. The six-piece imaging lens assembly of claim 1, wherein: the combined focal length of the first lens and the second lens is f12, the combined focal length of the third lens, the fourth lens and the fifth lens is f345, and the following conditions are satisfied: f12/f345 is more than 1.00 and less than 2.15.

18. The six-piece imaging lens assembly of claim 1, wherein: the combined focal length of the third lens, the fourth lens and the fifth lens is f345, the focal length of the sixth lens is f6, and the following conditions are satisfied: -1.95 < f345/f6 < -0.9.

19. The six-piece imaging lens assembly of claim 1, wherein: the third lens element has an object-side surface curvature radius of R5, an image-side surface curvature radius of R6, and satisfies the following conditions: -2.0 < R5/R6 < 4.8.

20. The six-piece imaging lens assembly of claim 1, wherein: the second lens element has an optical axis thickness of CT2, the first lens element has an optical axis thickness of CT1, and the following conditions are satisfied: 0.15 < CT2/CT1 < 0.45.

21. The six-piece imaging lens assembly of claim 1, wherein: the thickness of the third lens element on the optical axis is CT3, the thickness of the second lens element on the optical axis is CT2, and the following conditions are satisfied: 0.60 < CT3/CT2 < 1.35.

22. The six-piece imaging lens assembly of claim 1, wherein: the overall focal length of the six-piece imaging lens group is f, the distance between the object-side surface of the first lens element and the imaging plane on the optical axis is TL, and the following conditions are satisfied: f/TL is more than 0.6 and less than 1.2.

23. The six-piece imaging lens assembly of claim 1, wherein: the first lens has an abbe number of V1, the second lens has an abbe number of V2, and the following conditions are satisfied: 30 < V1-V2 < 42.

24. The six-piece imaging lens assembly of claim 1, wherein: the third lens has an abbe number of V3, the fourth lens has an abbe number of V4, and the following conditions are satisfied: 30 < V4-V3 < 42.

Technical Field

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

Background

In recent years, portable electronic devices such as smart phones and tablet computers have been rapidly developed, and miniaturized optical lenses applied to the portable electronic devices are indispensable, and with the progress of semiconductor manufacturing technology, image sensors with smaller area and higher pixels have been developed, and the miniaturized optical lenses have been further introduced into the high pixel field, so that the imaging quality has become the direction of research of various industries.

The conventional high-pixel miniaturized optical lens mounted on an electronic Device mostly adopts a five-piece lens structure, but due to the prevalence of high-specification portable electronic devices such as a Smart Phone (Smart Phone), a Wearable Device (Wearable Device), and a Tablet Personal Computer (Tablet Personal Computer), the requirements of the miniaturized optical lens on pixel and imaging quality are increased, and the conventional five-piece optical lens cannot meet the higher-order requirements.

Although conventional six-lens optical lenses have been developed, a photographing lens with a large aperture and high image quality is provided. However, the total optical length of the optical lens with large aperture and high image quality is easily too long, which makes it difficult to combine the characteristics of large aperture, high image quality and miniaturization, and is not suitable for the portable electronic device.

Therefore, the present invention is motivated to develop an optical lens that combines the features of a large aperture, high image quality, and miniaturization.

Disclosure of Invention

The present invention provides a six-piece imaging lens assembly, and more particularly, to a six-piece imaging lens assembly with a large aperture, high image quality and small size.

To achieve the above object, the present invention provides a six-lens imaging lens assembly, comprising an aperture stop and an optical assembly consisting of six lenses, in order from an object side to an image side: the aperture; a first lens element with positive refractive power having an object-side surface being convex at a paraxial region thereof and an image-side surface being concave at a paraxial region thereof, wherein at least one of the object-side surface and the image-side surface of the first lens element is aspheric; a second lens element with negative refractive power having an object-side surface being convex at a paraxial region thereof and an image-side surface being concave at a paraxial region thereof, wherein at least one of the object-side surface and the image-side surface of the second lens element is aspheric; a third lens element with refractive power, at least one of an object-side surface and an image-side surface of the third lens element being aspheric; a fourth lens element with negative refractive power having an object-side surface being convex at a paraxial region thereof and an image-side surface being concave at a paraxial region thereof, at least one of the object-side surface and the image-side surface of the fourth lens element being aspheric, and at least one of the object-side surface and the image-side surface of the fourth lens element having at least one inflection point; a fifth lens element with positive refractive power having an object-side surface being convex at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof, wherein at least one of the object-side surface and the image-side surface of the fifth lens element is aspheric and has at least one inflection point; and a sixth lens element with negative refractive power having a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region, wherein at least one of the object-side surface and the image-side surface of the sixth lens element is aspheric, and at least one of the object-side surface and the image-side surface of the sixth lens element has at least one inflection point.

Preferably, the focal length of the first lens is f1, the focal length of the second lens is f2, and the following conditions are satisfied: -0.6 < f1/f2 < -0.3. Therefore, the refractive power configuration of the first lens element and the second lens element is suitable, which is beneficial to obtaining a wide field angle and reducing excessive increase of system aberration.

Preferably, the focal length of the second lens is f2, the focal length of the third lens is f3, and the following conditions are satisfied: -0.03 < f2/f3 < 0.43. Therefore, the refractive power of the third lens element can be effectively distributed, and the refractive power of the third lens element is not too large, thereby facilitating the reduction of system sensitivity and the reduction of aberration.

Preferably, the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the following conditions are satisfied: -81 < f3/f4 < 3.1. Therefore, the refractive power of the fourth lens element can be effectively distributed, and the refractive power of the fourth lens element is ensured not to be too large, thereby being beneficial to reducing the system sensitivity and reducing the generation of aberration.

Preferably, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, and the following conditions are satisfied: 13.6 < f4/f5 < -3.3. Therefore, the refractive power of the fifth lens element can be effectively distributed, and the refractive power of the fifth lens element is ensured not to be too large, thereby being beneficial to reducing the system sensitivity and reducing the generation of aberration.

Preferably, the focal length of the fifth lens element is f5, the focal length of the sixth lens element is f6, and the following conditions are satisfied: -1.7 < f5/f6 < -0.75. Therefore, the refractive power of the sixth lens element can be effectively distributed, and the refractive power of the sixth lens element is not too large, thereby facilitating the reduction of system sensitivity and the reduction 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: -0.70 < f1/f23 < -0.30. Therefore, the balance of the refractive power of the six-piece imaging lens set can be maintained, and the optimal imaging effect is achieved.

Preferably, a focal length of the second lens element and the third lens element is f23, a focal length of the fourth lens element is f4, and the following conditions are satisfied: f23/f4 is more than 0.1 and less than 0.85. Therefore, the large visual angle and the large aperture characteristic of the six-piece imaging lens group are favorably improved, the sensitivity of the six-piece imaging lens group can be reduced, the manufacture of each lens is favorably realized, and the production yield is improved.

Preferably, a combined focal length of the second lens element and the third lens element is f23, a combined focal length of the fourth lens element and the fifth lens element is f45, and the following conditions are satisfied: -3.0 < f23/f45 < -1.0. When f23/f45 satisfies the above relation, the resolution capability of the six-piece imaging lens assembly is significantly improved while having a large angle, a high frame count and a low lens height, whereas if the resolution capability exceeds the data value range of the above optical formula, the performance, resolution capability and yield of the six-piece imaging lens assembly are low.

Preferably, a focal length of the fourth lens element is f45, a focal length of the sixth lens element is f6, and the following conditions are satisfied: -1.9 < f45/f6 < -0.85. When f45/f6 satisfies the above relation, the resolution capability of the six-piece imaging lens assembly is significantly improved while having a large angle, a high frame count and a low lens height, whereas if the resolution capability exceeds the data value range of the above optical formula, the performance, resolution capability and yield of the six-piece imaging lens assembly are low.

Preferably, a combined focal length of the first lens element and the second lens element is f12, a combined focal length of the third lens element and the fourth lens element is f34, and the following conditions are satisfied: -0.65 < f12/f34 < -0.15. When f12/f34 satisfies the above relation, the resolution capability of the six-piece imaging lens assembly is significantly improved while having a large angle, a high frame count and a low lens height, whereas if the resolution capability exceeds the data value range of the above optical formula, the performance, resolution capability and yield of the six-piece imaging lens assembly are low.

Preferably, a combined focal length of the third lens element and the fourth lens element is f34, and a combined focal length of the fifth lens element and the sixth lens element is f56, wherein the following conditions are satisfied: -1.25 < f34/f56 < -0.15. When f34/f56 satisfies the above relation, the resolution capability of the six-piece imaging lens assembly is significantly improved while having a large angle, a high frame count and a low lens height, whereas if the resolution capability exceeds the data value range of the above optical formula, the performance, resolution capability and yield of the six-piece imaging lens assembly are low.

Preferably, a combined focal length of the first lens element, the second lens element and the third lens element is f123, and a combined focal length of the fourth lens element and the fifth lens element is f45, and the following conditions are satisfied: f123/f45 is more than 1.00 and less than 2.5. By proper configuration of the refractive power, the spherical aberration and astigmatism can be reduced.

Preferably, a combined focal length of the first lens element, the second lens element and the third lens element is f123, and a combined focal length of the fourth lens element, the fifth lens element and the sixth lens element is f456, and the following conditions are satisfied: -0.35 < f123/f456 < 0.15. When f123/f456 satisfies the above relation, the resolution capability of the six-piece imaging lens assembly is significantly improved while having a large angle, a high frame count and a low lens height, whereas if the resolution capability exceeds the data value range of the optical formula, the performance and resolution capability of the six-piece imaging lens assembly are low, and the yield is insufficient.

Preferably, the focal length of the first lens element is f1, the combined focal length of the second lens element, the third lens element and the fourth lens element is f234, and the following conditions are satisfied: -1.05 < f1/f234 < -0.45. By proper configuration of the refractive power, the spherical aberration and astigmatism can be reduced.

Preferably, a combined focal length of the second lens element, the third lens element and the fourth lens element is f234, and a combined focal length of the fifth lens element and the sixth lens element is f56, and the following conditions are satisfied: -0.55 < f234/f56 < -0.15. By proper configuration of the refractive power, the spherical aberration and astigmatism can be reduced.

Preferably, a combined focal length of the first lens element and the second lens element is f12, and a combined focal length of the third lens element, the fourth lens element and the fifth lens element is f345, and the following conditions are satisfied: f12/f345 is more than 1.00 and less than 2.15. When f12/f345 satisfies the above relationship, the resolution capability of the six-piece imaging lens assembly is significantly improved while having a large angle, a high frame count and a low lens height, whereas if the resolution capability exceeds the data value range of the above optical formula, the performance, resolution capability and yield of the six-piece imaging lens assembly are low.

Preferably, a focal length of the third lens element, the fourth lens element and the fifth lens element is f345, a focal length of the sixth lens element is f6, and the following conditions are satisfied: -1.95 < f345/f6 < -0.9. When f345/f6 satisfies the above relationship, the resolution capability of the six-piece imaging lens assembly is significantly improved while having a large angle, a high frame count and a low lens height, whereas if the range of the data values of the above optical formula is exceeded, the performance, resolution and yield of the six-piece imaging lens assembly are low.

Preferably, a radius of curvature of an object-side surface of the third lens element is R5, a radius of curvature of an image-side surface of the third lens element is R6, and the following condition is satisfied: -2.0 < R5/R6 < 4.8. Thereby, the curvature configuration of the third lens surface is effectively balanced to achieve a balance between the angle of the field of view and the overall length.

Preferably, the thickness of the second lens element on the optical axis is CT2, the thickness of the first lens element on the optical axis is CT1, and the following conditions are satisfied: 0.15 < CT2/CT1 < 0.45. Therefore, the spherical aberration and astigmatism of the six-piece imaging lens group are effectively reduced.

Preferably, the thickness of the third lens element along the optical axis is CT3, the thickness of the second lens element along the optical axis is CT2, and the following conditions are satisfied: 0.60 < CT3/CT2 < 1.35. Therefore, the spherical aberration and astigmatism of the six-piece imaging lens group are effectively reduced.

Preferably, the overall focal length of the six-piece imaging lens assembly is f, the distance between the object-side surface of the first lens element and the image plane on the optical axis is TL, and the following conditions are satisfied: f/TL is more than 0.6 and less than 1.2. Therefore, the six-piece imaging lens group can be favorably mounted on a light and thin electronic product, and a wide picture angle (field angle) can be favorably obtained, and the miniaturization of the six-piece imaging lens group can be favorably maintained.

Preferably, the first lens has an abbe number of V1, the second lens has an abbe number of V2, and the following conditions are satisfied: 30 < V1-V2 < 42. Therefore, the chromatic aberration of the six-piece imaging lens group can be corrected.

Preferably, the third lens has an abbe number of V3, the fourth lens has an abbe number of V4, and the following conditions are satisfied: 30 < V4-V3 < 42. Therefore, the chromatic aberration of the six-piece imaging lens group can be corrected.

Description of the invention

Fig. 1A is a schematic view of a six-piece imaging lens set according to a first embodiment of the invention.

Fig. 1B is a graph of field curvature and distortion aberration curves of the six-piece imaging lens assembly of the first embodiment in order from left to right.

Fig. 2A is a schematic view of a six-piece imaging lens set according to a second embodiment of the invention.

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

Fig. 3A is a schematic view of a six-piece imaging lens set according to a third embodiment of the invention.

Fig. 3B is a graph of field curvature and distortion aberration curves of the six-piece imaging lens assembly of the third embodiment in order from left to right.

Fig. 4A is a schematic view of a six-piece imaging lens set according to a fourth embodiment of the invention.

Fig. 4B is a graph of field curvature and distortion aberration curves of the six-piece imaging lens assembly of the fourth embodiment in order from left to right.

Fig. 5A is a schematic view of a six-piece imaging lens set according to a fifth embodiment of the invention.

Fig. 5B is a graph of field curvature and distortion aberration curves of the sixth imaging lens assembly of the fifth embodiment in order from left to right.

Fig. 6A is a schematic view of a six-piece imaging lens assembly according to a sixth embodiment of the invention.

FIG. 6B is a graph showing the curvature of field and distortion aberration of the six-piece imaging lens assembly of the sixth embodiment in order from left to right.

Description of the reference numerals

100. 200, 300, 400, 500, 600: aperture

110. 210, 310, 410, 510, 610: first lens

111. 211, 311, 411, 511, 611: object side surface

112. 212, 312, 412, 512, 612: surface of image side

120. 220, 320, 420, 520, 620: second lens

121. 221, 321, 421, 521, 621: object side surface

122. 222, 322, 422, 522, 622: surface of image side

130. 230, 330, 430, 530, 630: third lens

131. 231, 331, 431, 531, 631: object side surface

132. 232, 332, 432, 532, 632: surface of image side

140. 240, 340, 440, 540, 640: fourth lens

141. 241, 341, 441, 541, 641: object side surface

142. 242, 342, 442, 542, 642: surface of image side

150. 250, 350, 450, 550, 650: fifth lens element

151. 251, 351, 451, 551, 651: object side surface

152. 252, 352, 452, 552, 652: surface of image side

160. 260, 360, 460, 560, 660: sixth lens element

161. 261, 361, 461, 561, 661: object side surface

162. 262, 362, 462, 562, 662: surface of image side

170. 270, 370, 470, 570, 670: infrared filtering element

180. 280, 380, 480, 580, 680: image plane

190. 290, 390, 490, 590, 690: optical axis

f: focal length of six-piece imaging lens group

Fno: aperture value of six-piece imaging lens group

FOV: maximum field angle in six-piece 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

f 4: focal length of the fourth lens

f 5: focal length of fifth lens

f 6: focal length of sixth lens

f 12: the combined focal length of the first lens and the second lens

f 23: the combined focal length of the second lens and the third lens

f 34: the combined focal length of the third lens and the fourth lens

f 45: the combined focal length of the fourth lens and the fifth lens

f 56: the combined focal length of the fifth lens and the sixth lens

f 123: the combined focal length of the first lens, the second lens and the third lens

f 234: the combined focal length of the second lens, the third lens and the fourth lens

f 345: the combined focal length of the third lens, the fourth lens and the fifth lens

f 456: the combined focal length of the fourth lens, the fifth lens and the sixth lens

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

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

V1: abbe number of first lens

V2: abbe number of second lens

V3: abbe number of third lens

V4: abbe number of fourth lens

TL: the distance between the object side surface of the first lens and the imaging surface on the optical axis.

Detailed Description

< first embodiment >

Referring to fig. 1A and fig. 1B, fig. 1A is a schematic view of a six-piece imaging lens assembly according to a first embodiment of the disclosure, and fig. 1B is a graph of curvature of field and distortion aberration of the six-piece imaging lens assembly of the first embodiment in order from left to right. In fig. 1A, the six-piece imaging lens assembly includes an aperture stop 100 and an optical assembly including, in order from an object side to an image side, a first lens element 110, a second lens element 120, a third lens element 130, a fourth lens element 140, a fifth lens element 150, a sixth lens element 160, an ir-cut filter element 170 and an image plane 180, wherein the six lens elements in the six-piece imaging lens assembly have six refractive power. The aperture stop 100 is disposed between the image-side surface 112 of the first lens 110 and an object.

The first lens element 110 with positive 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, wherein the object-side surface 111 and the image-side surface 112 are aspheric.

The second lens element 120 with negative refractive power has an object-side surface 121 being convex in a paraxial region 190 and an image-side surface 122 being concave 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 negative refractive power has an object-side surface 131 being concave in a paraxial region 190 and an image-side surface 132 being concave in a paraxial region 190, wherein the object-side surface 131 and the image-side surface 132 are aspheric.

The fourth lens element 140 with negative refractive power has an object-side surface 141 being convex at a paraxial region 190 and an image-side surface 142 being concave at a paraxial region 190, wherein the object-side surface 141 and the image-side surface 142 are aspheric and the object-side surface 141 and the image-side surface 142 have at least one inflection point.

The fifth lens element 150 with positive refractive power has an object-side surface 151 being convex at a paraxial region 190 and an image-side surface 152 being convex at a paraxial region 190, wherein the object-side surface 151 and the image-side surface 152 are aspheric, and the object-side surface 151 has at least one inflection point.

The sixth lens element 160 with negative refractive power has an object-side surface 161 being concave at a paraxial region 190 and an image-side surface 162 being concave at a paraxial region 190, wherein the object-side surface 161 and the image-side surface 162 are aspheric and the image-side surface 162 has at least one inflection point.

The ir-cut filter element 170 is made of glass, and is disposed between the sixth lens element 160 and the image plane 180 without affecting the focal length of the six-piece 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 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 … … is a higher order aspheric coefficient.

In the six-piece imaging lens group of the first embodiment, the focal length of the six-piece imaging lens group is f, the aperture value (f-number) of the six-piece imaging lens group is Fno, and the maximum field angle of view of the six-piece imaging lens group is FOV, which is as follows: f ═ 3.89 (millimeters); fno 1.86; and FOV 81 (degrees).

In the sixth imaging lens assembly of the first embodiment, the focal length of the first lens element 110 is f1, the focal length of the second lens element 120 is f2, and the following conditions are satisfied: f1/f2 is-0.42.

In the sixth imaging lens assembly of the first embodiment, the focal length of the second lens element 120 is f2, the focal length of the third lens element 130 is f3, and the following conditions are satisfied: f2/f3 is 0.21.

In the sixth imaging lens assembly of the first embodiment, the focal length of the third lens element 130 is f3, the focal length of the fourth lens element 140 is f4, and the following conditions are satisfied: f3/f4 is 2.35.

In the sixth imaging lens assembly of the first embodiment, the focal length of the fourth lens element 140 is f4, the focal length of the fifth lens element 150 is f5, and the following conditions are satisfied: f4/f5 is-6.53.

In the sixth imaging lens assembly of the first embodiment, the focal length of the fifth lens element 150 is f5, the focal length of the sixth lens element 160 is f6, and the following conditions are satisfied: f5/f6 is-1.06.

In the sixth imaging lens assembly of the first embodiment, 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, which satisfies the following conditions: f1/f23 is-0.51.

In the sixth imaging lens assembly of the first embodiment, the combined focal length of the second lens element 120 and the third lens element 130 is f23, the focal length of the fourth lens element 140 is f4, and the following conditions are satisfied: f23/f4 is 0.41.

In the sixth imaging lens assembly of the first embodiment, a combined focal length of the second lens element 120 and the third lens element 130 is f23, a combined focal length of the fourth lens element 140 and the fifth lens element 150 is f45, and the following conditions are satisfied: f23/f45 is-2.31.

In the sixth imaging lens assembly of the first embodiment, the combined focal length of the fourth lens element 140 and the fifth lens element 150 is f45, the focal length of the sixth lens element 160 is f6, and the following conditions are satisfied: f45/f6 is-1.23.

In the sixth imaging lens assembly of the first embodiment, a combined focal length of the first lens element 110 and the second lens element 120 is f12, a combined focal length of the third lens element 130 and the fourth lens element 140 is f34, and the following conditions are satisfied: f12/f34 is-0.44.

In the sixth imaging lens assembly of the first embodiment, a combined focal length of the third lens element 130 and the fourth lens element 140 is f34, a combined focal length of the fifth lens element 150 and the sixth lens element 160 is f56, and the following conditions are satisfied: f34/f56 is-0.93.

In the first embodiment of the six-piece imaging lens assembly, a combined focal length of the first lens element 110, the second lens element 120 and the third lens element 130 is f123, and a combined focal length of the fourth lens element 140 and the fifth lens element 150 is f45, and the following conditions are satisfied: f123/f45 is 1.64.

In the first embodiment of the six-piece imaging lens assembly, a combined focal length of the first lens element 110, the second lens element 120 and the third lens element 130 is f123, and a combined focal length of the fourth lens element 140, the fifth lens element 150 and the sixth lens element 160 is f456, and the following conditions are satisfied: f123/f456 is 0.03.

In the first embodiment of the six-piece 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, the third lens element 130 and the fourth lens element 140 is f234, and the following conditions are satisfied: f1/f234 ═ 0.76.

In the first embodiment of the six-piece imaging lens assembly, a combined focal length of the second lens element 120, the third lens element 130 and the fourth lens element 140 is f234, and a combined focal length of the fifth lens element 150 and the sixth lens element 160 is f56, and the following conditions are satisfied: f234/f56 ═ 0.37.

In the sixth imaging lens assembly of the first embodiment, a combined focal length of the first lens element 110 and the second lens element 120 is f12, and a combined focal length of the third lens element 130, the fourth lens element 140 and the fifth lens element 150 is f345, and the following conditions are satisfied: f12/f345 is 1.64.

In the sixth imaging lens assembly of the first embodiment, the combined focal length of the third lens element 130, the fourth lens element 140 and the fifth lens element 150 is f345, and the focal length of the sixth lens element 160 is f6, and the following conditions are satisfied: f345/f6 is-1.29.

In the sixth lens element assembly of the first embodiment, 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 ═ 1.53.

In the first embodiment of the six-piece imaging lens assembly, the thickness of the second lens element 120 along the optical axis 190 is CT2, the thickness of the first lens element 110 along the optical axis 190 is CT1, and the following conditions are satisfied: CT2/CT1 is 0.31.

In the first embodiment of the six-piece imaging lens assembly, the thickness of the third lens element 130 along the optical axis 190 is CT3, the thickness of the second lens element 120 along the optical axis 190 is CT2, and the following conditions are satisfied: CT3/CT2 equals 1.00.

In the first embodiment of the present invention, the overall focal length of the six-piece imaging lens assembly is f, the distance between the object-side surface 111 of the first lens element 110 and the image plane 180 on the optical axis 190 is TL, and the following conditions are satisfied: f/TL is 0.85.

In the sixth imaging lens assembly of the first embodiment, the abbe number of the first lens element 110 is V1, the abbe number of the second lens element 120 is V2, and the following conditions are satisfied: V1-V2 ═ 35.63.

In the sixth imaging lens assembly of the first embodiment, the third lens element 130 has an abbe number of V3, and the fourth lens element 140 has an abbe number of V4, and the following conditions are satisfied: V4-V3 ═ 35.63.

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

Table 1 shows the detailed structural data of the first embodiment of FIG. 1A, wherein the units of the radius of curvature, the thickness and the focal length are mm, and the surfaces 0-16 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 … … denotes a higher-order aspheric coefficient. In addition, the following tables of the embodiments correspond to the schematic diagrams and the field curvature 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 are not repeated herein.

< second embodiment >

Referring to fig. 2A and 2B, fig. 2A is a schematic view of a six-piece imaging lens assembly according to a second embodiment of the invention, and fig. 2B is a graph of curvature of field and distortion aberration of the six-piece imaging lens assembly of the second embodiment in order from left to right. In fig. 2A, the six-piece imaging lens assembly includes an aperture stop 200 and an optical assembly including, in order from an object side to an image side, a first lens element 210, a second lens element 220, a third lens element 230, a fourth lens element 240, a fifth lens element 250, a sixth lens element 260, an ir-cut filter 270 and an image plane 280, wherein the six lens elements in the six-piece imaging lens assembly have six refractive power. The aperture stop 200 is disposed between the image-side surface 212 of the first lens element 210 and an object.

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

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

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

The fourth lens element 240 with negative refractive power has an object-side surface 241 being convex at a paraxial region 290 thereof and an image-side surface 242 being concave at a paraxial region 290 thereof, wherein the object-side surface 241 and the image-side surface 242 are aspheric and the object-side surface 241 and the image-side surface 242 both have at least one inflection point.

The fifth lens element 250 with positive refractive power has an object-side surface 251 being convex at a paraxial region 290 and an image-side surface 252 being convex at a paraxial region 290, wherein the object-side surface 251 and the image-side surface 252 are aspheric and the object-side surface 251 has at least one inflection point.

The sixth lens element 260 with negative refractive power has an object-side surface 261 being concave at a paraxial region 290 thereof and an image-side surface 262 being concave at a paraxial region 290 thereof, wherein the object-side surface 261 and the image-side surface 262 are aspheric and the image-side surface 262 has at least one inflection point.

The ir-cut filter 270 is made of glass, and is disposed between the sixth lens element 260 and the image plane 280 without affecting the focal length of the six-piece 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 and 3B, fig. 3A is a schematic view of a six-piece imaging lens assembly according to a third embodiment of the invention, and fig. 2B is a graph of curvature of field and distortion aberration of the six-piece imaging lens assembly of the third embodiment in order from left to right. In fig. 3A, the six-piece imaging lens assembly includes an aperture stop 300 and an optical assembly including, in order from an object side to an image side, a first lens element 310, a second lens element 320, a third lens element 330, a fourth lens element 340, a fifth lens element 350, a sixth lens element 360, an ir-cut filter 370 and an image plane 380, wherein the six lens elements in the six-piece imaging lens assembly have six refractive power. The aperture stop 300 is disposed between the image-side surface 312 of the first lens element 310 and an object.

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

The second lens element 320 with negative refractive power has an object-side surface 321 being convex at a paraxial region 390 and an image-side surface 322 being concave at a paraxial region 390, and 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 and an image-side surface 332 being concave at a paraxial region 390, and the object-side surface 331 and the image-side surface 332 are aspheric.

The fourth lens element 340 with negative refractive power has an object-side surface 341 being convex at a paraxial region 390, an image-side surface 342 being concave at a paraxial region 390, the object-side surface 341 and the image-side surface 342 being aspheric, and the object-side surface 341 and the image-side surface 342 both have at least one inflection point.

The fifth lens element 350 with positive refractive power has an object-side surface 351 being convex in a paraxial region 390 thereof and an image-side surface 352 being convex in a paraxial region 390 thereof, wherein the object-side surface 351 and the image-side surface 352 are aspheric, and the object-side surface 351 has at least one inflection point.

The sixth lens element 360 with negative refractive power has an object-side surface 361 being concave at a paraxial region 390 thereof and an image-side surface 362 being concave at a paraxial region 390 thereof, wherein the object-side surface 361 and the image-side surface 362 are aspheric and the image-side surface 362 has at least one inflection point.

The ir-cut filter 370 is made of glass and disposed between the sixth lens element 360 and the image plane 380 without affecting the focal length of the six-piece 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 and 4B, fig. 4A is a schematic view of a six-piece imaging lens assembly according to a fourth embodiment of the invention, and fig. 4B is a graph of curvature of field and distortion aberration of the six-piece imaging lens assembly of the fourth embodiment in order from left to right. In fig. 4A, the six-piece imaging lens assembly includes an aperture stop 400 and an optical assembly including, in order from an object side to an image side, a first lens element 410, a second lens element 420, a third lens element 430, a fourth lens element 440, a fifth lens element 450, a sixth lens element 460, an ir-cut filter 470 and an image plane 480, wherein six lens elements in the six-piece imaging lens assembly have refractive power. The aperture stop 400 is disposed between an image-side surface 412 of the first lens 410 and an object.

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

The second lens element 420 with negative 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 fourth lens element 440 with negative refractive power has an object-side surface 441 being convex at a paraxial region 490 thereof and an image-side surface 442 being concave at the paraxial region 490 thereof, wherein the object-side surface 441 and the image-side surface 442 are aspheric, and the object-side surface 441 and the image-side surface 442 both have at least one inflection point.

The fifth lens element 450 with positive refractive power has an object-side surface 451 being convex at a paraxial region 490 thereof and an image-side surface 452 being convex at a paraxial region 490 thereof, wherein the object-side surface 451 and the image-side surface 452 are aspheric, and the object-side surface 451 has at least one inflection point.

The sixth lens element 460 with negative refractive power has an object-side surface 461 being concave at a paraxial region 490 thereof and an image-side surface 462 being concave at a paraxial region 490 thereof, wherein the object-side surface 461 and the image-side surface 462 are aspheric and the image-side surface 462 has at least one inflection point.

The ir-cut filter 470 is made of glass and disposed between the sixth lens element 460 and the image plane 480 without affecting the focal length of the six-piece 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 and 5B, fig. 5A is a schematic view of a six-piece imaging lens assembly according to a fifth embodiment of the invention, and fig. 5B is a graph of curvature of field and distortion aberration of the six-piece imaging lens assembly of the fifth embodiment in order from left to right. In fig. 5A, the six-lens imaging lens assembly includes an aperture stop 500 and an optical assembly including, in order from an object side to an image side, a first lens element 510, a second lens element 520, a third lens element 530, a fourth lens element 540, a fifth lens element 550, a sixth lens element 560, an ir-cut filter element 570 and an image plane 580, wherein the six lens elements in the six-lens imaging lens assembly have six refractive power. The stop 500 is disposed between an image-side surface 512 of the first lens 510 and an object.

The first lens element 510 with positive refractive power has an object-side surface 511 being convex in a paraxial region 590, an image-side surface 512 being concave 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 negative refractive power has an object-side surface 521 being convex in a paraxial region 590, and an image-side surface 522 being concave 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 positive refractive power has an object-side surface 531 being concave at a paraxial region 590 and an image-side surface 532 being convex at a paraxial region 590, and both the object-side surface 531 and the image-side surface 532 are aspheric.

The fourth lens element 540 with negative refractive power has an object-side surface 541 being convex in a paraxial region 590 and an image-side surface 542 being concave in a paraxial region 590, the object-side surface 541 and the image-side surface 542 are aspheric, and the object-side surface 541 and the image-side surface 542 have at least one inflection point.

The fifth lens element 550 with positive refractive power has an object-side surface 551 being convex in a paraxial region 590, an image-side surface 552 being convex in a paraxial region 590, the object-side surface 551 and the image-side surface 552 being aspheric, and the object-side surface 551 has at least one inflection point.

The sixth lens element 560 with negative refractive power has an object-side surface 561 being concave in a paraxial region 590, and an image-side surface 562 being concave in a paraxial region 590, wherein the object-side surface 561 and the image-side surface 562 are aspheric, and the image-side surface 562 has at least one inflection point.

The ir-cut filter element 570 is made of glass, and is disposed between the sixth lens element 560 and the image plane 580 without affecting the focal length of the six-piece 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 and 6B, fig. 6A is a schematic view of a six-piece imaging lens assembly according to a sixth embodiment of the disclosure, and fig. 6B is a graph of curvature of field and distortion aberration of the six-piece imaging lens assembly according to the sixth embodiment in order from left to right. In fig. 6A, the six-piece imaging lens assembly includes an aperture stop 600 and an optical assembly including, in order from an object side to an image side, a first lens element 610, a second lens element 620, a third lens element 630, a fourth lens element 640, a fifth lens element 650, a sixth lens element 660, an ir-cut filter element 670 and an image plane 680, wherein six lens elements in the six-piece imaging lens assembly have refractive power. The aperture stop 600 is disposed between an image side surface 612 of the first lens 610 and an object.

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

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

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

The fourth lens element 640 with negative refractive power has an object-side surface 641 being convex in a paraxial region 690 thereof and an image-side surface 642 being concave in a paraxial region 690 thereof, wherein the object-side surface 641 and the image-side surface 642 are aspheric, and the object-side surface 641 and the image-side surface 642 have at least one inflection point.

The fifth lens element 650 with positive refractive power has an object-side surface 651 being convex at a paraxial region 690 thereof and an image-side surface 652 being convex at a paraxial region 690 thereof, wherein the object-side surface 651 and the image-side surface 652 are aspheric, and the object-side surface 651 has at least one inflection point.

The sixth lens element 660 with negative refractive power has an object-side surface 661 being concave at a paraxial region 690 thereof and an image-side surface 662 being concave at a paraxial region 690 thereof, wherein the object-side surface 661 and the image-side surface 662 are aspheric and the image-side surface 662 has at least one inflection point.

The ir-cut filter 670 is made of glass and disposed between the sixth lens element 660 and the image plane 680 without affecting the focal length of the six-piece 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:

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

In the six-piece imaging lens assembly provided by the present invention, regarding the lens with 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 paraxial region; 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.

The six-piece imaging lens group provided by the invention can be applied to an optical system for moving focusing according to requirements, has the characteristics of excellent aberration correction and good imaging quality, and can be applied to electronic image systems such as 3D (three-dimensional) image acquisition, digital cameras, mobile devices, digital flat panels or vehicle photography in many aspects.

In summary, the above embodiments and drawings are only preferred embodiments of the present invention, and the scope of the present invention should not be limited thereby, that is, all equivalent changes and modifications made according to the claims of the present invention should be covered by the scope of the present invention.