Optical image capturing system

Patent metadata

Field	Value
Publication number	US-9563036-B2
Application number	US-201514678948-A
Country	US
Kind code	B2
Filing date	Apr 4, 2015
Priority date	Dec 1, 2014
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

The invention discloses a four-piece optical lens and a four-piece optical module for capturing an image. In order from an object side to an image side, the optical lens along the optical axis comprises a first lens with positive refractive power; a second lens with refractive power; a third lens with refractive power; and a fourth lens with refractive power; and at least one of the image-side surface and object-side surface of each of the four lens elements are aspheric. The optical lens can increase aperture value and improve the imaging quality for use in compact cameras.

First claim

What is claimed is:

1. An optical image capturing system, in order along an optical axis from an object side to an image side, comprising:
a first lens having positive refractive power;
a second lens having negative refractive power;
a third lens having refractive power;
a fourth lens having refractive power; and
an image plane;
wherein the optical image capturing system consists of the four lenses with refractive power; at least two of the four lenses each has at least an inflection point on a surface thereof; at least one of the lenses from the second lens to the fourth lens has positive refractive power; the fourth lens has an object-side surface, which faces the object side, and an image-side surface, which faces the image side, and both the object-side surface and the image-side surface of the fourth lens are aspheric surfaces;
wherein the optical image capturing system satisfies:
1.2≦ f/HEP≦ 3.0 and 0.5≦ HOS/f≦ 3.0;

where f is a focal length of the optical image capturing system; HEP is an entrance pupil diameter of the optical image capturing system; and HOS is a distance in parallel with the optical axis from an object-side surface of the first lens to the image plane.

2. The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
0 deg< HAF≦ 70 deg;
| TDT|< 60%; and
| ODT|< 50%;
where HAF is a half of a view angle of the optical image capturing system; TDT is a TV distortion; and ODT is an optical distortion.

3. The optical image capturing system of claim 1 , wherein the fourth lens has at least an inflection point on at least one surface thereof.

4. The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
0 mm< HIF≦ 5 mm;
where HIF is a distance perpendicular to the optical axis between any inflection point and the optical axis.

5. The optical image capturing system of claim 4 , wherein the optical image capturing system further satisfies:
0< HIF/InTL≦ 5;
where InTL is a distance in parallel with the optical axis between the object-side surface of the first lens and the image-side surface of the fourth lens.

6. The optical image capturing system of claim 4 , wherein the optical image capturing system further satisfies:
0 mm< SGI≦ 1 mm;
where SGI is a displacement in parallel with the optical axis from a point on a surface of the lens, through which the optical axis passes, to the inflection point on the surface.

7. The optical image capturing system of claim 1 , wherein the fourth lens has negative refractive power.

8. The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
0.6≦ InTL/HOS≦ 0.9;

where InTL is a distance in parallel with the optical axis between an object-side surface, which faces the object side, of the first lens and the image-side surface of the fourth lens.

9. The optical image capturing system of claim 5 , further comprising an aperture and an image sensor on the image plane, wherein the optical image capturing system further satisfies:
0.5≦ InS/HOS≦ 1.1 and 0< HIF/HOI≦ 0.9;

where InS is a distance in parallel with the optical axis between the aperture and the image plane; and HOI is a height for an image formation of the optical image capturing system.

10. An optical image capturing system, in order along an optical axis from an object side to an image side, comprising:
a first lens having positive refractive power;
a second lens having negative refractive power;
a third lens having refractive power;
a fourth lens having refractive power; and
an image plane;
wherein the optical image capturing system consists of the four lenses with refractive power; at least two of the four lenses each has at least an inflection point on a surface thereof; at least one of the lenses from the second lens to the fourth lens has positive refractive; the fourth lens has an object-side surface, which faces the object side, and an image-side surface, which faces the image side, and both the object-side surface and the image-side surface of the fourth lens are aspheric surfaces;
wherein the optical image capturing system satisfies:
1.2≦ f/HEP≦ 3.0; 0.5≦ HOS/f≦ 3.0; 0.4≦|tan( HAF )|≦3.0; | TDT|< 60%; and | ODT|≦ 50%;

where f is a focal length of the optical image capturing system; HEP is an entrance pupil diameter of the optical image capturing system; HOS is a distance in parallel with the optical axis between an object-side surface, which face the object side, of the first lens and the image plane; HAF is a half of a view angle of the optical image capturing system; TDT is a TV distortion; and ODT is an optical distortion.

11. The optical image capturing system of claim 10 , wherein at least one of the third lens and the fourth lens has at least an inflection point on at least one surface thereof.

12. The optical image capturing system of claim 10 , wherein the object-side surface and the image-side surface of the fourth lens both have at least one inflection point thereon.

13. The optical image capturing system of claim 10 , wherein the optical image capturing system further satisfies:
0 mm< HOS≦ 7 mm.

14. The optical image capturing system of claim 10 , wherein the optical image capturing system further satisfies:
0 mm< InTL≦ 5 mm;
where InTL is a distance in parallel with the optical axis between an object-side surface, which face the object side, of the first lens and the image-side surface of the fourth lens.

15. The optical image capturing system of claim 10 , wherein the optical image capturing system further satisfies:
0 mm<Σ TP≦ 4 mm;

where ΣTP is a sum of central thicknesses of the lenses on the optical axis.

16. The optical image capturing system of claim 10 , wherein the optical image capturing system further satisfies:
0< SGI 421/( TP 4+ SGI 421)≦0.6;

where SGI421 is a displacement in parallel with the optical axis from a point on the image-side surface of the fourth lens, through which the optical axis passes, to the inflection point, which is the closest to the optical axis, on the image-side surface of the fourth lens; and TP4 is a thickness of the fourth lens on the optical axis.

17. The optical image capturing system of claim 10 , wherein the optical image capturing system further satisfies:
0≦ IN 12/ f≦ 0.2;

where IN12 is a distance on the optical axis between the first lens and the second lens.

18. The optical image capturing system of claim 10 , wherein the optical image capturing system further satisfies:
0<| f/f 2|≦2;

where f2 is a focal length of the second lens.

19. The optical image capturing system of claim 10 , wherein the optical image capturing system further satisfies:
0<| f/f 1|≦2; 0<| f/f 2|≦2; 0<| f/f 3|≦2; and 0<| f/f 4|≦3;

where f1 is a focal length of the first lens; f2 is a focal length of the second lens; f3 is a focal length of the third lens; and f4 is a focal length of the fourth lens.

20. An optical image capturing system, in order along an optical axis from an object side to an image side, comprising:
a first lens having positive refractive power;
a second lens having negative refractive power;
a third lens having refractive power;
a fourth lens having refractive power, and having at least an inflection point on at least one of an image-side surface, which faces the image side, and an object-side surface, which faces the object side; and
an image plane;
wherein the optical image cap

Assignees

• Ability Opto Electronics Technology Co Ltd

Inventors

• Liao Kuo-Yu
• Lee Hung-Wen
• Chang Yeong-Ming

Classifications

• G02B13/004 Primary

  having four lenses · CPC title