Optical image capturing system

Patent metadata

Field	Value
Publication number	US-10025065-B2
Application number	US-201514965706-A
Country	US
Kind code	B2
Filing date	Dec 10, 2015
Priority date	May 15, 2015
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A three-piece optical lens for capturing image and a three-piece optical module for capturing image, along the optical axis in order from an object side to an image side, include a first lens with positive refractive power, wherein an object-side surface thereof can be convex; a second lens with refractive power; and a third lens with refractive power, wherein both surfaces of each of the aforementioned lenses can be aspheric; the third lens can have positive refractive power, wherein an image-side surface thereof can be concave, and both surfaces thereof are aspheric; at least one surface of the third lens has an inflection point. 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, which is composed of a first lens, a second lens, a third lens, and an image plane, in order along an optical axis from an object side to an image side, wherein the first lens has refractive power; the second lens has refractive power; and the third lens has refractive power;
wherein the optical image capturing system consists of the three lenses with refractive power; at least one lens among the first to the third lenses has positive refractive power; the third 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 third lens are aspheric surfaces;
wherein the optical image capturing system satisfies:
1.2< f/HEP< 6.0;
0.5< HOS/f< 3.0;
0 <InTL/HOS< 0.9; and 1<2( ARE/HEP )<1.5;

where f1, f2 and f3 are focal lengths of the first lens to the third 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; InTL is a distance from the object-side surface of the first lens to the image-side surface of the third lens; for any surface of the first lens to the third lens, ARE is a profile curve length measured from a start point where the optical axis passes therethrough, along a surface profile thereof, and finally to a coordinate point of a perpendicular distance where is a half of the entrance pupil diameter away from the optical axis;
wherein the second lens has an object-side surface, which faces the object side, and an image-side surface, which faces the image side: the object-side surface of the second lens has at least one inflection point;
wherein the optical image capturing system further satisfies:
PLTA< 20 μm;

PSTA< 20 μm;

NLTA< 20 μm;

NSTA< 20 μm;

SLTA< 20 μm:

SSTA< 20 μm; and

ITDTI< 60%;

where TDT is a TV distortion; HOI is a height for image formation perpendicular to the optical axis on the image plane; PLTA is a transverse aberration at 0.7 HOI on the image plane in the positive direction of a tangential fan of the optical image capturing system after a longest operation wavelength passing through an edge of the aperture; PSTA is a transverse aberration at 0.7 HOI on the image plane in the positive direction of the tangential fan after a shortest operation wavelength passing through the edge of the aperture; NLTA is a transverse aberration at 0.7 HOI on the image plane in the negative direction of the tangential fan after the longest operation wavelength passing through the edge of the aperture; NSTA is a transverse aberration at 0.7 HOI on the image plane in the negative direction of the tangential fan after the shortest operation wavelength passing through the edge of the aperture; SLTA is a transverse aberration at 0.7 HOI on the image plane of a sagittal fan of the optical image capturing system after the longest operation wavelength passing through the edge of the aperture; SSTA is a transverse aberration at 0.7 HOI on the image plane of a sagittal fan after the shortest operation wavelength passing through the edge of the aperture.

2. The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
1≤ ARS/EHD≤ 1.5;

where, for any surface of the first lens to the third lens, EHD is a maximum effective half diameter thereof, ARS is a profile curve length measured from a start point where the optical axis passes therethrough, along a surface profile thereof, and finally to an end point of the maximum effective half diameter thereof.

3. The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
0 mm< HOS≤ 10 mm.

4. 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.

5. The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
0.5≤ ARE 31/ TP 3≤10; and

0.5≤ ARE 32/ TP 3≤10;

where ARE31 is a profile curve length measured from a start point where the optical axis passes the object-side surface of the third lens, along a surface profile of the object-side surface of the third lens, and finally to a coordinate point of a perpendicular distance where is a half of the entrance pupil diameter away from the optical axis; ARE32 is a profile curve length measured from a start point where the optical axis passes the image-side surface of the third lens, along a surface profile of the image-side surface of the third lens, and finally to a coordinate point of a perpendicular distance where is a half of the entrance pupil diameter away from the optical axis; TP3 is a thickness of the third lens on the optical axis.

6. The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
0.5≤ ARE 21/ TP 2≤10; and

0.5≤ ARE 22/ TP 2≤10;

where ARE21 is a profile curve length measured from a start point where the optical axis passes the object-side surface of the second lens, along a surface profile of the object-side surface of the second lens, and finally to a coordinate point of a perpendicular distance where is a half of the entrance pupil diameter away from the optical axis; ARE22 is a profile curve length measured from a start point where the optical axis passes the image-side surface of the second lens, along a surface profile of the image-side surface of the second lens, and finally to a coordinate point of a perpendicular distance where is a half of the entrance pupil diameter away from the optical axis; TP2 is a thickness of the second lens on the optical axis.

7. The optical image capturing system of claim 1 , wherein the second lens has negative refractive power, and the third lens has positive refractive power.

8. The optical image capturing system of claim 1 , further comprising an aperture, 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.

9. An optical image capturing system, which is composed of a first lens, a second lens, a third lens, and an image plane, in order along an optical axis from an object side to an image side, wherein
the first lens has positive refractive power;
the second lens has refractive power; and
the third lens has refractive power;
wherein the optical image capturing system consists of the three lenses with refractive power; at least a surface of each of at least two lenses among the first to the third lenses has at least an inflection point; at least one lens between the second and the third lenses has positive refractive power; the third 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 third lens are aspheric surfaces;
wherein the optical image capturing system satisfies:
1.2< f 4/ HEP< 6.0;
0.5< HOS/f< 3.0;
0 <InTL/HOS< 0.9; and
1<2( ARE/HEP )<1.5;

where f1, f2 and f3 are focal lengths of the first lens to the third 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 t

Assignees

• Ability Opto Electronics Technology Co Ltd

Inventors

• Liu yao-wei
• Chang Yeong-Ming

Classifications

• G02B13/0035 Primary

  having three lenses · CPC title

• G02B9/16

  all the components being simple · CPC title