Optical image capturing system, image capturing device and electronic device

Patent metadata

Field	Value
Publication number	US-9961244-B2
Application number	US-201514700243-A
Country	US
Kind code	B2
Filing date	Apr 30, 2015
Priority date	Jan 30, 2015
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

An optical image capturing system comprising, 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, a sixth lens element and a seventh lens element. The first lens element with negative refractive power has a concave image-side surface. The second lens element, the third lens element and the fourth lens element have refractive power. The fifth lens element has refractive power. The sixth lens element with refractive power has an image-side surface being concave in a paraxial region and includes at least one convex shape in an off-axial region, wherein the surfaces thereof are aspheric. The seventh lens element with refractive power has an image-side surface being concave in a paraxial region and includes at least one convex shape in an off-axial region, wherein the surfaces thereof are aspheric.

First claim

What is claimed is:

1. An optical image capturing system comprising, in order from an object side to an image side:
a first lens element with negative refractive power having an image-side surface being concave in a paraxial region thereof;
a second lens element;
a third lens element having positive refractive power;
a fourth lens element having negative refractive power;
a fifth lens element having positive refractive power;
a sixth lens element having an image-side surface being concave in a paraxial region thereof and comprising at least one convex shape in an off-axial region thereof, wherein an object-side surface and the image-side surface of the sixth lens element are aspheric; and
a seventh lens element having an image-side surface being concave in a paraxial region thereof and comprising at least one convex shape in an off-axial region thereof, wherein an object-side surface and the image-side surface of the seventh lens element are aspheric;
wherein the optical image capturing system has a total of seven lens elements, there is no relative movement among the lens elements, a focal length of the optical image capturing system is f, a curvature radius of an object-side surface of the first lens element is R 1 , a curvature radius of the image-side surface of the sixth lens element is R 12 , a curvature radius of the image-side surface of the seventh lens element is R 14 , a vertical distance between a non-axial critical point on the image-side surface of the sixth lens element and an optical axis is Yc 62 , and the following conditions are satisfied:
| f/R 1|<1.25;
0 <R 12/ R 14; and
0.1< Yc 62/ f< 1.0.

2. The optical image capturing system of claim 1 , wherein the second lens element has positive refractive power.

3. The optical image capturing system of claim 2 , wherein a half of a maximal field of view of the optical image capturing system is HFOV, and the following condition is satisfied:
HFOV<35 degrees.

4. The optical image capturing system of claim 1 , wherein the focal length of the optical image capturing system is f, the curvature radius of an object-side surface of the first lens element is R 1 , and the following condition is satisfied:
| f/R 1|<1.0.

5. The optical image capturing system of claim 1 , wherein the focal length of the optical image capturing system is f, the curvature radius of the image-side surface of the seventh lens element is R 14 , and the following condition is satisfied:
1.5< f/R 14.

6. The optical image capturing system of claim 1 , wherein the object-side surface of the seventh lens element is convex in a paraxial region thereof and comprises at least one concave shape in an off-axial region thereof.

7. The optical image capturing system of claim 6 , wherein the focal length of the optical image capturing system is f, a focal length of the sixth lens element is f6,a focal length of the seventh lens element is f7,and the following condition is satisfied:
| f/f 6|+| f/f 7|<0.75.

8. The optical image capturing system of claim 7 , wherein a central thickness of the sixth lens element is CT 6 , a central thickness of the seventh lens element is CT 7 , an axial distance between the sixth lens element and the seventh lens element is T 67 , and the following condition is satisfied:
1.75<( CT 6+ CT 7)/ T 67.

9. The optical image capturing system of claim 7 , wherein an f-number of the optical image capturing system is Fno, and the following condition is satisfied:
Fno<2.0.

10. The optical image capturing system of claim 1 , wherein the fourth lens element and the fifth lens element are cemented to each other.

11. The optical image capturing system of claim 10 , wherein a composite focal length of the fourth lens element and the fifth lens element is f45, and the following condition is satisfied:
0<f45.

12. The optical image capturing system of claim 1 , wherein the focal length of the optical image capturing system is f, a focal length of the sixth lens element is f6,a focal length of the seventh lens element is f7,and the following condition is satisfied:
| f/f 6|+| f/f 7<0.55.

13. The optical image capturing system of claim 1 , wherein a sum of central thicknesses of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element is ΣCT, an axial distance between the object-side surface of the first lens element and the image-side surface of the seventh lens element is Td, and the following condition is satisfied:
0. 55<Σ CT/Td< 0.80.

14. The optical image capturing system of claim 1 , wherein a maximum effective radius of the object-side surface and the image-side surface of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element is SDmax, a minimum effective radius of the object-side surface and the image-side surface of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element is SDmin, and the following condition is satisfied:
SD max/ SD min<2.25.

15. The optical image capturing system of claim 1 , wherein an axial distance between the second lens element and the third lens element is T 23 , a central thickness of the second lens element is CT 2 , and the following condition is satisfied:
T 23/ CT 2<0.50.

16. The optical image capturing system of claim 1 , wherein a chief ray angle of a maximum image height on an image surface of the optical image capturing system is CRA(Ymax), and the following condition is satisfied:
CRA ( Y max)<15 degrees.

17. The optical image capturing system of claim 1 , further comprising:
a stop, wherein a composite focal length of the lens elements disposed between an object and the stop is ff, a composite focal length of the lens elements disposed between the stop and an image surface is fr, and the following condition is satisfied:
3.0< |ff/fr|.

18. An image capturing device, comprising:
the optical image capturing system of claim 1 ; and
an image sensor, wherein the image sensor is disposed on an image surface of the optical image capturing system.

19. An electronic device, comprising:
the image capturing device of claim 18 .

Assignees

• Largan Precision Co Ltd

Inventors

• Liao Lin-Yao
• Hsieh Dung-Yi
• Chen Wei-Yu

Classifications

• H10P70/52

  Cleaning of diamond · CPC title

• H10P70/12

  by dry cleaning only (H10P70/52 takes precedence) · CPC title

• H10P50/283

  by chemical means · CPC title

• H10P50/242

  of Group IV materials · CPC title

• H10P50/20

  Dry etching; Plasma etching; Reactive-ion etching · CPC title