Optical image capturing system

Patent metadata

Field	Value
Publication number	US-9599790-B2
Application number	US-201514721904-A
Country	US
Kind code	B2
Filing date	May 26, 2015
Priority date	Dec 4, 2014
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

The invention discloses a four-piece optical lens for capturing image and a four-piece optical module for capturing 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 wherein at least one of the image-side surface and object-side surface of each of the four lens elements is aspheric whereby the optical lens can increase aperture value and improve the imagining 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 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 ≦3.5;

0.5 ≦HOS/f ≦3.0; and

0 <Σ|InRS|/InTL ≦3;

where f 1 , f 2 , f 3 , and f 4 are focal lengths of the first lens to the fourth lens, respectively; 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 from an object-side surface of the first lens to the image plane; Σ|InRS| is a sum of InRSO and InRSI, where InRSO is a sum of absolute values of the displacements in parallel with the optical axis of each lens with refractive power from the central point on the object-side surface to the point at the maximum effective semi diameter of the object-side surface, and InRSI is a sum of absolute values of the displacements in parallel with the optical axis of each lens with refractive power from the central point on the image-side surface to the point at the maximum effective semi diameter of the image-side surface; and 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.

2. The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
| TDT|< 60%;
where TDT is a TV distortion.

3. The optical image capturing system of claim 1 , wherein t the optical image capturing system further satisfies:
| ODT|< 50%;
where ODT is an optical distortion.

4. The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
0 mm<HOS≦7 mm.

5. The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
0 deg<HAF≦70 deg;

where HAF is a half of a view angle of the optical image capturing system.

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

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

8. The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
0.45 ≦ΣTP/InTL ≦0.95;

where ΣTP is a sum of thicknesses of the lenses having refractive power.

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;

where InS is a distance in parallel with the optical axis between the aperture and the image plane.

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 lenses from the first lens to the fourth lens 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 ≦3.5;

0.5 ≦HOS/f ≦3.0; and

0 <Σ|InRS|/InTL ≦3;

where f 1 , f 2 , f 3 , and f 4 are focal lengths of the first lens to the fourth lens, respectively; 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; Σ|InRS| is a sum of InRSO and InRSI, where InRSO is a sum of absolute values of the displacements in parallel with the optical axis of each lens with refractive power from the central point on the object-side surface to the point at the maximum effective semi diameter of the object-side surface, and InRSI is a sum of absolute values of the displacements in parallel with the optical axis of each lens with refractive power from the central point on the image-side surface to the point at the maximum effective semi diameter of the image-side surface; and 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.

11. The optical image capturing system of claim 10 , wherein the fourth lens has negative refractive power, and has at least an inflection point on at least one of the object-side surface and the image-side surface thereof.

12. The optical image capturing system of claim 10 , wherein the optical image capturing system further satisfies:
0.5 ≦ΣPPR ≦10;

where PPR is a ratio of the focal length f of the optical image capturing system to a focal length fp of each of lenses with positive refractive power.

13. The optical image capturing system of claim 10 , wherein the optical image capturing system further satisfies:
| TDT |<60%; and
| ODT |<50%;
where TDT is a TV distortion and ODT is an optical distortion.

14. The optical image capturing system of claim 10 , wherein the fourth lens has negative refractive power.

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

16. The optical image capturing system of claim 10 , wherein the optical image capturing system further satisfies:
0 mm<| InRS 31 |+|InRS 32 |+|InRS 41 |+|InRS 42|≦8 mm;

where InRS 31 is a displacement in parallel with the optical axis from a point on the object-side surface of the third lens, through which the optical axis passes, to a point at the maximum effective semi diameter of the object-side surface of the third lens; InRS 32 is a displacement in parallel with the optical axis from a point on the image-side surface of the third lens, through which the optical axis passes, to a point at the maximum effective semi diameter of the image-side surface of the third lens; InRS 41 is a displacement in parallel with the optical axis from a point on the object-side surface of the fourth lens, through which the optical axis passes, to a point at the maximum effective semi diameter of the object-side surface of the fourth lens; InRS 42 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 a point at the maximum effective semi diameter of the image-side sur

Assignees

• Ability Opto Electronics Technology Co Ltd

Inventors

• Liao Kuo-Yu
• Lee Hung-Wen
• Liu yao-wei
• Chang Yeong-Ming

Classifications

• G02B13/004 Primary

  having four lenses · CPC title

• G02B13/18

  with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)} · CPC title

• G02B13/06

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