Optical image capturing system

Patent metadata

Field	Value
Publication number	US-9632286-B2
Application number	US-201514686333-A
Country	US
Kind code	B2
Filing date	Apr 14, 2015
Priority date	Feb 16, 2015
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

The present disclosure discloses an optical image capturing system, sequentially arranged from an object side to an image side, 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 an image-side surface and an object-side surface of the fourth lens element are aspheric. The optical image capturing system can increase aperture value and improve the imagining quality for applying to compact cameras.

First claim

What is claimed is:

1. An optical image capturing system, sequentially arranged from an object side to an image side, comprising:
a first lens element with positive refractive power;
a second lens element with refractive power;
a third lens element with refractive power;
a fourth lens element with refractive power; and
an image plane;
wherein the optical image capturing system comprises the four lens elements with refractive power, at least one of the second through fourth lens elements has positive refractive power, an object-side surface and an image-side surface of the fourth lens element are aspheric, focal lengths of the first through fourth lens elements are f1, f2, f3 and f4 respectively, a focal length of the optical image capturing system is f, an entrance pupil diameter of the optical image capturing system is HEP, a distance from an object-side surface of the first lens element to the image plane is HOS, a distance on an optical axis from the object-side surface of the first lens element to the image-side surface of the fourth lens element is InTL, a sum of an absolute value of each distance in parallel with the optical axis from a maximum effective diameter position on an object-side surface of each of the four lens elements to an axial point on the object-side surface of each of the four lens elements is InRSO, a sum of an absolute value of each distance in parallel with the optical axis from a maximum effective diameter position on an image-side surface of each of the four lens elements to an axial point on the image-side surface of each of the four lens elements is InRSI, a sum of InRSO and InRSI is Σ|InRS|, and the following relation is satisfied: 1.2≦f/HEP≦6.0, 0.5≦HOS/f≦3.0, and 0<Σ|InRS|/InTL≦3, and
wherein at least one surface of the third lens element has at least two inflection points.

2. The optical image capturing system of claim 1 , wherein TV distortion for image formation in the optical image capturing system is TDT, and the following relation is satisfied: |TDT|<60%.

3. The optical image capturing system of claim 1 , wherein optical distortion for image formation in the optical image capturing system is ODT, and the following relation is satisfied: |ODT|<50%.

4. The optical image capturing system of claim 1 , wherein the following relation is satisfied: 0 mm<HOS≦7 mm.

5. The optical image capturing system of claim 1 , wherein half of a maximal view angle of the optical image capturing system is HAF, and the following relation is satisfied: 0 deg<HAF≦70 deg.

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

7. The optical image capturing system of claim 1 , wherein the following relation is satisfied: 0.45≦InTL/HOS≦0.9.

8. The optical image capturing system of claim 1 , wherein a total central thickness of all lens elements with refractive power on the optical axis is ΣTP, and the following relation is satisfied: 0.45≦ΣTP/InTL≦0.95.

9. The optical image capturing system of claim 1 , wherein an aperture stop is further comprised and a distance from the aperture stop to the image plane is InS, and the following relation is satisfied: 0.5≦InS/HOS≦1.2.

10. An optical image capturing system, sequentially arranged from an object side to an image side, comprising:
a first lens element with positive refractive power;
a second lens element with refractive power;
a third lens element with refractive power;
a fourth lens element with refractive power; and
an image plane;
wherein the optical image capturing system comprises the four lens elements with refractive power and at least two lens elements among the four lens elements respectively have at least one inflection point on at least one surface thereof, at least one of the second through fourth lens elements has positive refractive power, an object-side surface and an image-side surface of the fourth lens element are aspheric, focal lengths of the first through fourth lens elements are f1, f2, f3 and f4 respectively, a focal length of the optical image capturing system is f, an entrance pupil diameter of the optical image capturing system is HEP, a distance from an object-side surface of the first lens element to the image plane is HOS, a distance on an optical axis from the object-side surface of the first lens element to the image-side surface of the fourth lens element is InTL, a sum of an absolute value of each distance in parallel with the optical axis from a maximum effective diameter position on an object-side surface of each of the four lens elements to an axial point on the object-side surface of each of the four lens elements is InRSO, a sum of an absolute value of each distance in parallel with the optical axis from a maximum effective diameter position on an image-side surface of each of the fourth lens elements to an axial point on the image-side surface of each of the fourth lens elements is InRSI, a sum of InRSO and InRSI is Σ|InRS|, and the following relation is satisfied: 1.2≦f/HEP≦6.0, 0.5≦HOS/f≦3.0, and 0<Σ|InRS|/InTL≦3, and
wherein at least one surface of the third lens element has at least two inflection points.

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

12. The optical image capturing system of claim 10 , wherein a ratio f/fp of the focal length f of the optical image capturing system to a focal length fp of each of lens elements with positive refractive power is PPR and the following relation is satisfied: 0.5≦ΣPPR≦10.

13. The optical image capturing system of claim 10 , wherein TV distortion and optical distortion for image formation in the optical image capturing system are TDT and ODT, respectively, and the following relation is satisfied: |TDT|<60% and |ODT|≦50%.

14. The optical image capturing system of claim 10 , wherein at least one surface of at least one of the third and the fourth lens elements has at least one inflection point.

15. The optical image capturing system of claim 10 , wherein the following relation is satisfied: 0 mm<Σ|InRS|≦10 mm.

16. The optical image capturing system of claim 10 , wherein a distance in parallel with an optical axis from a maximum effective diameter position on the object-side surface of the third lens element to an axial point on the object-side surface of the third lens element is InRS31, a distance in parallel with the optical axis from a maximum effective diameter position on the image-side surface of the third lens element to an axial point on the image-side surface of the third lens element is InRS32, a distance in parallel with an optical axis from a maximum effective diameter position on the object-side surface of the fourth lens element to an axial point on the object-side surface of the fourth lens element is InRS41, a distance in parallel with an optical axis from a maximum effective diameter position on the image-side surface of the fourth lens element to an axial point on the image-side surface of the fourth lens element is InRS42, and the following relation is satisfied: 0 mm<|InRS31|+|InRS32|+|InRS41|+|InRS42|≦8 mm.

17. The optical image capturing system of claim 16 , wherein the following relation is satisfied: 0<(|InRS31|+|InRS32|+|InRS41|+|InRS42|)/InTL≦2.

18. The optical image capturing system of claim 16 , wherein the following relation is satisfied: 0<(|InRS31|+|InRS32|+|InRS41|+|InRS42|)/HOS≦2.

19. The op

Assignees

• Ability Opto Electronics Technology Co Ltd

Inventors

• Liu yao-wei
• Chang Yeong-Ming

Classifications

• G02B9/34

  having four components only · CPC title

• G02B13/004 Primary

  having four lenses · CPC title

• G02B13/06

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