Optical lens assembly and image capturing device

Patent metadata

Field	Value
Publication number	US-10386603-B2
Application number	US-201816015491-A
Country	US
Kind code	B2
Filing date	Jun 22, 2018
Priority date	Feb 4, 2015
Publication date	Aug 20, 2019
Grant date	Aug 20, 2019

Abstract

An optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element and a third lens element. The first lens element with positive refractive power has an object-side surface being convex, and the object-side surface and an image-side surface thereof are aspheric. The second lens element with negative refractive power has an image-side surface being concave, and an object-side surface and the image-side surface thereof are aspheric. The third lens element with refractive power has an object-side surface being concave, and the object-side surface and an image-side surface thereof are aspheric. The optical lens assembly further includes a stop with no lens element having refractive power disposed between the stop and the first lens element. The optical lens assembly has a total of three lens elements with refractive power.

First claim

What is claimed is:

1. An optical lens assembly comprising, in order from an object side to an image side:
a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof;
a second lens element, wherein at least one of an object-side surface and an image-side surface of the second lens element is aspheric; and
a third lens element, wherein at least one of an object-side surface and an image-side surface of the third lens element is aspheric;
wherein the optical lens assembly has a total of three lens elements, an absolute value of a curvature radius of the image-side surface of the second lens element is greater than an absolute value of a curvature radius of the object-side surface of the third lens element, an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, a central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, and the following conditions are satisfied:
(V2+V3)/V1<1.0; and
0<CT1/CT2<1.00.

2. The optical lens assembly of claim 1 , wherein the third lens element has negative refractive power.

3. The optical lens assembly of claim 1 , wherein the second lens element has the image-side surface being concave in a paraxial region thereof.

4. The optical lens assembly of claim 1 , wherein the third lens element has the object-side surface being concave in a paraxial region thereof.

5. The optical lens assembly of claim 1 , wherein a curvature radius of the object-side surface of the first lens element is R1, a focal length of the optical lens assembly is f, and the following condition is satisfied:
0<R1/f<0.40.

6. The optical lens assembly of claim 1 , wherein each of the three lens elements is a single and non-cemented lens element, a curvature radius of the object-side surface of the third lens element is R5, a focal length of the optical lens assembly is f, and the following condition is satisfied:
−2.6<R5/f<0.

7. The optical lens assembly of claim 6 , wherein the curvature radius of the object-side surface of the third lens element is R5, the focal length of the optical lens assembly is f, and the following condition is satisfied:
−1.0<R5/f<0.

8. The optical lens assembly of claim 1 , wherein a focal length of the optical lens assembly is f, a maximum image height of the optical lens assembly is ImgH, and the following condition is satisfied:
2.3<f/ImgH<4.5.

9. The optical lens assembly of claim 1 , wherein an axial distance between the object-side surface of the first lens element and an image surface is TL, a maximum image height of the optical lens assembly is ImgH, and the following condition is satisfied:
2.0<TL/ImgH<3.5.

10. The optical lens assembly of claim 1 , wherein the object-side surface of the first lens element has the largest curvature among surfaces of the three lens elements.

11. The optical lens assembly of claim 1 , wherein the second lens element has the largest central thickness among central thicknesses of the three lens elements.

12. The optical lens assembly of claim 1 , further comprising an aperture stop located between the first lens element and the second lens element.

13. The optical lens assembly of claim 1 , wherein an absolute value of the curvature radius of the image-side surface of the third lens element is greater than the absolute value of the curvature radius of the object-side surface of the third lens element.

14. An image capturing device, comprising:
the optical lens assembly of claim 1 ; and
an image sensor disposed on an image surface of the optical lens assembly.

15. An optical lens assembly comprising, in order from an object side to an image side:
a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof;
a second lens element having negative refractive power; and
a third lens element with negative refractive power having at least one of an object-side surface and an image-side surface of the third lens element being aspheric;
wherein the optical lens assembly has a total of three lens elements, an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, a central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, and the following conditions are satisfied:
(V2+V3)/V1<1.0; and
0<CT1/CT2<1.00.

16. The optical lens assembly of claim 15 , wherein the third lens element has the object-side surface being concave in a paraxial region thereof.

17. The optical lens assembly of claim 15 , wherein the first lens element has an image-side surface being concave in a paraxial region thereof.

18. The optical lens assembly of claim 15 , wherein the first lens element, the second lens element, and the third lens element are made of plastic, an entrance pupil diameter of the optical lens assembly is EPD, a maximum image height of the optical lens assembly is ImgH, and the following condition is satisfied:
0.90<EPD/ImgH<1.7.

19. The optical lens assembly of claim 15 , wherein the object-side surface of the first lens element has the largest curvature among surfaces of the three lens elements.

20. The optical lens assembly of claim 15 , wherein the central thickness of the first lens element is CT1, the central thickness of the second lens element is CT2, a central thickness of the third lens element is CT3, an axial distance between the object-side surface of the first lens element and an image surface is TL, a maximum image height of the optical lens assembly is ImgH, and the following conditions are satisfied:
1.30<(CT2+CT3)/CT1; and
2.0<TL/ImgH<3.5.

21. The optical lens assembly of claim 15 , wherein the second lens element has the largest central thickness among central thicknesses of the three lens elements; a curvature radius of the object-side surface of the second lens element is R3, and a curvature radius of the image-side surface of the second lens element is R4, and the following condition is satisfied:
0.3<(R3+R4)/(R3−R4)<2.5.

22. The optical lens assembly of claim 15 , further comprising an aperture stop located between the first lens element and the second lens element.

23. An optical lens assembly comprising, in order from an object side to an image side:
a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof;
a second lens element; and
a third lens element having at least one of an object-side surface and an image-side surface of the third lens element being aspheric;
wherein the optical lens assembly has a total of three lens elements; the first lens element, the second lens element, and the third lens element are made of plastic; the optical lens assembly further comprises an aperture stop located between the first lens element and the second lens element, there is no relative movement between each of adjacent lens elements of the three lens elements; an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, a central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, half of a maximal field of view of the optical lens assembly is HFOV, and the following conditions are satis

Assignees

• Largan Precision Co Ltd

Inventors

• Hsueh Chun-Che
• Huang Hsin-Hsuan

Classifications

• G02B13/0035 Primary

  having three lenses · CPC title