Optical image capturing system

Patent metadata

Field	Value
Publication number	US-9835831-B2
Application number	US-201615144578-A
Country	US
Kind code	B2
Filing date	May 2, 2016
Priority date	Sep 24, 2015
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

An optical image capturing system includes, along the optical axis in order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. At least one lens among the first to the sixth lenses has positive refractive force. The seventh lens can have negative refractive force, wherein both surfaces thereof are aspheric, and at least one surface thereof has an inflection point. The lenses in the optical image capturing system which have refractive power include the first to the seventh lenses. The optical image capturing system 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 refractive power;
a second lens having refractive power;
a third lens having refractive power;
a fourth lens having refractive power;
a fifth lens having refractive power;
a sixth lens having refractive power;
a seventh lens having refractive power; and
an image plane;
wherein the optical image capturing system consists of the seven lenses with refractive power; a maximum height for image formation perpendicular to the optical axis on the image plane is denoted as HOI; at least one lens among the first to the seventh lenses has positive refractive power; each lens of the first to the seventh lenses 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:
1.2≦ f/HEP≦ 10.0; and

0.5≦ SETP/STP< 1;

where f1, f2 f3, f4, f5, f6, and f7 are focal lengths of the first lens to the seventh 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 between a point on an object-side surface of the first lens where the optical axis passes through and a point on the image plane where the optical axis passes through; ETP1, ETP2, ETP3, ETP4, ETP5, ETP6, and ETP7 are respectively a thickness at the height of ½ HEP of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens; SETP is a sum of the aforementioned ETP1 to ETP7; TP1, TP2, TP3, TP4, TP5, TP6, and TP7 are respectively a thickness of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens on the optical axis; STP is a sum of the aforementioned TP1 to TP7.

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

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 seventh lens.

3. The optical image capturing system of claim 2 , wherein the optical image capturing system further satisfies:
0.3≦ SETP/EIN<I.

4. The optical image capturing system of claim 1 , further comprising a filtering component provided between the seventh lens and the image plane, wherein the optical image captming system further satisfies:
0.1≦ EIR/PIR≦ 1.1;

where EIR 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 seventh lens and the filtering component; PIR is a horizontal distance in parallel with the optical axis between a point on the image-side surface of the seventh lens where the optical axis passes through and the filtering component.

5. The optical image capturing system of claim 1 , wherein at least one lens among the first to the seventh lenses has at least one inflection point on either the object-side surface or the image-side surface thereof.

6. The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
MTFE 0≧0.1;

MTFE 3≧0.01; and

MTFE 7≧0.01;

where MTFEO, MTFE3, and MTFE7 are respectively a value of modulation transfer function of visible light in a spatial frequency of 55 cycles/mm at the optical axis, 0.3 HOI, and 0.7 HOI on an image plane.

7. The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
0.4≦| tan( HAF )|≦6.0;

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

8. The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
0.1≦ EBL/BL≦ 1.1;

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 seventh 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 seventh lens where the optical axis passes through and the image plane.

9. The optical image capturing system of claim 1 , further comprising an aperture and an image sensor, wherein the image sensor is provided on the image plane; the optical image capturing system further satisfies:
0.1≦ 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.

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 refractive power;
a third lens having refractive power;
a fourth lens having refractive power;
a fifth lens having refractive power;
a sixth lens having refractive power;
a seventh lens having refractive power; and
an image plane;
wherein the optical image capturing system consists of the seven lenses with refractive power; a maximum height for image formation perpendicular to the optical axis on the image plane is denoted as HOI; at least one lens among the second to the seventh lenses has positive refractive power; each lens among the first to the seventh lenses has an object-side surface, which faces the object side, and an image-side surface, which faces the image side; each lens of at least two lenses among the first lens to the seventh lens has at least an inflection point on either the object-side surface or the image-side surface thereof;
wherein the optical image capturing system satisfies:
1.2≦ f/HEP< 10.0; and

0.2 EIN/ETL< 1;

where f1, f2 f3, f4, f5, f6, and f7 are focal lengths of the first lens to the seventh lens.

11. The optical image capturing system of claim 10 , wherein the optical image capturing system further satisfies:
0< ED 67/ IN 67≦50;

where ED67 is a horizontal distance between the sixth lens and the seventh lens at the height of ½ HEP; IN67 is a horizontal distance between the sixth lens and the seventh 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 ED12 is a horizontal distance between the first lens and the second lens at the height of ½ HEP; IN12 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< ETP 2/ TP 2≦33;

where ETP2 is a thickness of the second lens at the height of ½ HEP in parallel with the optical axis; TP2 is a thickness of the second lens on the optical axis.

14. The optical image capturing system of claim 10 , wherein the optical image capturing system further satisfies:
0< ETP 6/ TP 6≦3;

where ETP6 is a thickness of the sixth lens at the height of ½ HEP in parallel with the optical axis; TP6 is a thickness of the sixth lens on the optical axis.

15. The optical image capturing system of claim 10 , wherein the optical image capturing system further satisfies:
0< ETP 7/ TP 7≦5;

where ETP7 is a thickness of the seve

Assignees

• Ability Opto Electronics Technology Co Ltd

Inventors

• Tang Nai-Yuan
• Liu yao-wei
• Chang Yeong-Ming

Classifications

• G02B13/00

  Optical objectives specially designed for the purposes specified below (with variable magnification {in general} G02B15/00) · 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

• G02B13/146

  with corrections for use in multiple wavelength bands, such as infrared and visible light, e.g. FLIR systems · CPC title

• G02B13/0045 Primary

  having five or more lenses · CPC title

• G02B7/04

  with mechanism for focusing or varying magnification · CPC title