Optical image capturing system

Patent metadata

Field	Value
Publication number	US-10073241-B2
Application number	US-201615357200-A
Country	US
Kind code	B2
Filing date	Nov 21, 2016
Priority date	Apr 28, 2016
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

The invention discloses a three-piece optical lens for capturing image and a five-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; and a third lens with refractive power; and at least one of the image-side surface and object-side surface of each of the three 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 negative refractive power;
a second lens having refractive power;
a third lens having refractive power; and
an image plane;
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; each lens among the first lens to the third lens has an object-side surface, which faces the object side, and an image-side surface, which faces the image side;

wherein the optical image capturing system satisfies:
1≤ f/HEP≤ 10;

50 deg< HAF≤ 150 deg; and
0.5≤ SETP/STP< 1;

where f is a focal length of the optical image capturing system; HEP is an entrance pupil diameter of the optical image capturing system; HAF is a half of a maximum view angle of the optical image capturing system; ETP 1 , ETP 2 , and ETP 3 are respectively a thickness at the height of ½ HEP of the first lens, the second lens, and the third lens; SETP is a sum of the aforementioned ETP 1 to ETP 3 ; TP 1 , TP 2 , and TP 3 are respectively a thickness of the first lens, the second lens, and the third lens on the optical axis; STP is a sum of the aforementioned TP 1 to TP 3 .

2. The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
0.2≤ EIN/ETL< 1;

where ETL is a distance in parallel with the optical axis between a coordinate point at a height of ½ HEP on the object-side surface of the first lens and the image plane; EIN is a distance in parallel with the optical axis between the coordinate point at the height of ½ HEP on the object-side surface of the first lens and a coordinate point at a height of ½ HEP on the image-side surface of the third lens.

3. The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
0.3≤ SETP/EIN< 1;

where EIN is a distance in parallel with the optical axis between the coordinate point at the height of ½ HEP on the object-side surface of the first lens and a coordinate point at a height of ½ HEP on the image-side surface of the third lens.

4. The optical image capturing system of claim 1 , further comprising a light filter located between the third lens and the image plane, wherein the optical image capturing system satisfies:
0.1≤ EIR/PIR≤ 1.1;

where Elk is a horizontal distance in parallel with the optical axis between the coordinate point at the height of ½ HEP on the image-side surface of the third lens and the filtering component; KR is a horizontal distance in parallel with the optical axis between a point on the image-side surface of the third lens where the optical axis passes through and the filtering component.

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

6. The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
MTFE0≥0.2;

MTFE3≥0.01; and

MTFE7≥0.01;

where MTFE 0 , MTFE 3 , and MTFE 7 are respectively a value of modulation transfer function in a spatial frequency of 55 cycles/mm at the optical axis, 0.3 HOI, and 0.7 HOI on the image plane for visible light.

7. The optical image capturing system of claim 1 , wherein the image plane is either flat or curved.

8. The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
0.1≤ EBL/BL≤ 1.5;

where EBL is a horizontal distance in parallel with the optical axis between a coordinate point at the height of ½ HEP on the image-side surface of the third lens and image surface; BL is a horizontal distance in parallel with the optical axis between the point on the image-side surface of the third lens where the optical axis passes through and the image plane.

9. The optical image capturing system of claim 1 , further comprising an aperture, wherein the optical image capturing system further satisfies:
0.2≤ InS/HOS≤ 1.1;

where InS is a distance between the aperture and the image plane; HOS is a distance between the object-side surface of the first lens and the image plane on the optical axis.

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 negative refractive power;
a second lens having refractive power;
a third lens having refractive power; and
an image plane;
wherein the optical image capturing system consists of the three lenses with refractive power; at least a surface of at least one lens among the first to the third lenses has at least an inflection point; at least one lens among the second lens to the third lens has positive refractive power; each lens among the first lens to the third lens has an object-side surface, which faces the object side, and an image-side surface, which faces the image side;
wherein the optical image capturing system satisfies:
1.0≤ f/HEP≤ 10.0;

50 deg< HAF≤ 150 deg; and
0.2≤ EIN/ETL< 1;

where f is a focal length of the optical image capturing system; HEP is an entrance pupil diameter of the optical image capturing system; HAF is a half of a maximum view angle of the optical image capturing system; ETL is a distance in parallel with the optical axis between a coordinate point at a height of ½ HEP on the object-side surface of the first lens and the image plane; EIN is a distance in parallel with the optical axis between the coordinate point at the height of ½ HEP on the object-side surface of the first lens and a coordinate point at a height of ½ HEP on the image-side surface of the third lens.

11. The optical image capturing system of claim 10 , wherein the optical image capturing system further satisfies:
0< ED 23/ IN 23≤50;

where ED 23 is a horizontal distance between the second lens and the third lens at the height of ½ HEP; IN 23 is a horizontal distance between the second lens and the third lens on the optical axis.

12. The optical image capturing system of claim 10 , wherein the optical image capturing system further satisfies:
0< ED 12/ IN 12≤35;

where ED 12 is a horizontal distance between the first lens and the second lens at the height of ½ HEP; IN 12 is a horizontal distance between the first lens and the second lens on the optical axis.

13. The optical image capturing system of claim 10 , wherein the optical image capturing system further satisfies:
0.1≤ ETP 1/ TP 1≤1;

where ETP 1 is a thickness of the first lens at the height of ½ HEP in parallel with the optical axis; TP 1 is a thickness of the first lens on the optical axis.

14. The optical image capturing system of claim 10 , wherein the optical image capturing system further satisfies:
0< ETP 2/ TP 2≤3;

where ETP 2 is a thickness of the second lens at the height of ½ HEP in parallel with the optical axis; TP 2 is a thickness of the second lens on the optical axis.

15. The optical image capturing system of claim 10 , wherein the optical image capturing system further satisfies:
0< ETP 3/ TP 3≤5;

where ETP 3 is a thickness of the third lens at the height of ½ HEP in parallel with the optical axis; TP 3 is a thickness of the third lens on the optical axis.

16. The optical image capturing system of claim 10 , wherein the optical image capturing system further satisfies:
0< IN 12/ f≤ 60;
where IN 12 is a horizontal distance between the first lens and the second lens on the optical axis.

Assignees

• Ability Opto Electronics Technology Co Ltd

Inventors

• Lai Chien-Hsun
• Tang Nai-Yuan
• Chang Yeong-Ming

Classifications

• G02B13/0035 Primary

  having three lenses · CPC title

• G02B9/16

  all the components being simple · CPC title

• G02B27/646

  compensating for small deviations, e.g. due to vibration or shake (movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68) · 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