Photographing optical lens assembly, image capturing unit and electronic device

Patent metadata

Field	Value
Publication number	US-10048466-B2
Application number	US-201614991485-A
Country	US
Kind code	B2
Filing date	Jan 8, 2016
Priority date	Nov 27, 2015
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

A photographing optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element has negative refractive power. The second lens element has negative refractive power. The fourth lens element has positive refractive power. The fifth lens element has positive refractive power. The sixth lens element has negative refractive power. The photographing optical lens assembly has a total of six lens elements, and the photographing optical lens assembly further includes an aperture stop.

First claim

What is claimed is:

1. A photographing optical lens assembly comprising, in order from an object side to an image side:
a first lens element having negative refractive power;
a second lens element having negative refractive power;
a third lens element;
a fourth lens element having positive refractive power;
a fifth lens element having positive refractive power; and
a sixth lens element having negative refractive power;
wherein an absolute value of a focal length of the second lens element is larger than an absolute value of a focal length of the sixth lens element;
wherein the photographing optical lens assembly has a total of six lens elements, the photographing optical lens assembly further comprises an aperture stop; a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the third lens element is f3, a central thickness of the third lens element is CT3, a central thickness of the sixth lens element is CT6, a curvature radius of a surface closest to the aperture stop among all surfaces of at least one of the lens elements of the photographing optical lens assembly located between the imaged object and the aperture stop is Rsf, a focal length of the photographing optical lens assembly is f, a minimum central thickness among central thicknesses of all lens elements of the photographing optical lens assembly is CTmin, and the following conditions are satisfied:
| f 1|<| f 2|<| f 3|;
0< CT 6/ CT 3<0.80;
4.0<CT3/CTmin≤7.65; and

−1.5< Rsf/f.

2. The photographing optical lens assembly of claim 1 , wherein the third lens element has an image-side surface being concave.

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

4. The photographing optical lens assembly of claim 1 , wherein the aperture stop is disposed between the third lens element and the fourth lens element.

5. The photographing optical lens assembly of claim 1 , wherein the curvature radius of the surface closest to the aperture stop among all surfaces of the at least one of the lens elements of the photographing optical lens assembly located between the imaged object and the aperture stop is Rsf, the focal length of the photographing optical lens assembly is f, and the following condition is satisfied:
0< Rsf/f.

6. The photographing optical lens assembly of claim 1 , wherein a curvature radius of an object-side surface of the third lens element is R5, a curvature radius of an image-side surface of the third lens element is R6, and the following condition is satisfied:
−0.20<( R 5− R 6)/( R 5+ R 6)<0.35.

7. The photographing optical lens assembly of claim 1 , wherein a central thickness of the lens element having the strongest refractive power among all lens elements of the photographing optical lens assembly is CTPmax, a central thickness of the lens element having the weakest refractive power among all lens elements of the photographing optical lens assembly is CTPmin, and the following condition is satisfied:
0.90< CTP min/ CTP max<10.0.

8. The photographing optical lens assembly of claim 1 , wherein the central thickness of the third lens element is CT3, a maximum central thickness among central thicknesses of all lens elements of the photographing optical lens assembly is CTmax, and the following condition is satisfied:
0.85< CT 3/ CT max≤1.0.

9. The photographing optical lens assembly of claim 1 , wherein the focal length of the first lens element is f1, the focal length of the second lens element is f2, the focal length of the third lens element is f3, a focal length of the fourth lens element is f4, and the following condition is satisfied:
(| f 1|+| f 2|+| f 4|)/| f 3|<1.0.

10. The photographing optical lens assembly of claim 1 , wherein the focal length of the photographing optical lens assembly is f, an axial distance between an object-side surface of the first lens element and an image surface is TL, and the following conditions are satisfied:
0< f/TL< 0.20; and
2.0 millimeters< f< 6.0 millimeters.

11. The photographing optical lens assembly of claim 1 , wherein the focal length of the first lens element is f1, the focal length of the second lens element is f2, the focal length of the third lens element is f3, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, a focal length of the i-th lens element is fi, and the following condition is satisfied:
| f 3|>| fi | wherein i= 1,2,4,5,6.

12. The photographing optical lens assembly of claim 1 , wherein the focal length of the photographing optical lens assembly is f, the focal length of the third lens element is f3, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, and the following conditions are satisfied:
0< f 4/ f 5<1.5; and
−0.30< f/f 3<0.30.

13. The photographing optical lens assembly of claim 1 , wherein a curvature radius of an image-side surface of the third lens element is R6, the central thickness of the third lens element is CT3, and the following condition is satisfied:
0< R 6/ CT 3<2.5.

14. The photographing optical lens assembly of claim 1 , wherein the central thickness of the third lens element is CT3, the central thickness of the sixth lens element is CT6, and the following condition is satisfied:
0< CT 6/ CT 3<0.35.

15. The photographing optical lens assembly of claim 1 , wherein a composite focal length of the first lens element and the second lens element is f12, the focal length of the photographing optical lens assembly is f, and the following condition is satisfied:
−1.45< f 12/ f<− 0.70.

16. An image capturing unit, comprising:
the photographing optical lens assembly of claim 1 ; and
an image sensor, wherein the image sensor is disposed on an image surface of the photographing optical lens assembly.

17. An electronic device, comprising:
the image capturing unit of claim 16 .

18. The photographing optical lens assembly of claim 1 , wherein the second lens element has an object-side surface being concave.

19. The photographing optical lens assembly of claim 1 , wherein the sixth lens element has an image-side surface being concave.

20. A photographing optical lens assembly comprising, in order from an object side to an image side:
a first lens element having negative refractive power;
a second lens element having negative refractive power;
a third lens element;
a fourth lens element having positive refractive power;
a fifth lens element having positive refractive power; and
a sixth lens element having negative refractive power;
wherein the photographing optical lens assembly has a total of six lens elements, and a central thickness of the second lens element is larger than a central thickness of the sixth lens element;
wherein the photographing optical lens assembly further comprises an aperture stop, there are a front lens group comprising every lens element located between an imaged object and the aperture stop in the photographing optical lens assembly, and a rear lens group comprising every lens element located between the aperture stop and an image surface in the photographing optical lens assembly; a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the third lens element is f3, a central thickness of the third lens element is CT3, a minimum central

Assignees

• Largan Precision Co Ltd
• Largan Precision Co Ltd

Inventors

• Hsieh Tung-Yi
• Huang Hsin-Hsuan

Classifications

• G02B13/06

  Panoramic objectives; So-called "sky lenses" {including panoramic objectives having reflecting surfaces} · CPC title

• G02B13/005

  having spherical lenses only · CPC title

• G02B13/0045 Primary

  having five or more lenses · CPC title