Optical image capturing system

Patent metadata

Field	Value
Publication number	US-9778439-B2
Application number	US-201514817537-A
Country	US
Kind code	B2
Filing date	Aug 4, 2015
Priority date	Jan 29, 2015
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

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; 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 positive refractive power;
a second lens having negative refractive power;
a third lens having positive refractive power; and
an image plane;
wherein the optical image capturing system consists of the three lenses with refractive power; the third lens has positive refractive power; each of 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, 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 ≦1.42; and 0<Σ|InRS|/InTL≦3;

where f is a focal length of the optical image capturing system; HEP is an entrance pupil diameter of the optical image capturing system; and HOS is a distance along the optical axis from the object-side surface of the first lens to the image plane; InTL is a distance between the object-side surface of the first lens and the image-side surface of the third lens along the optical axis; and Σ|InRS| is a sum of absolute values of a displacement for each lens with refractive power from a central point passed through by the optical axis to a point on the optical axis where a projection of a maximum effective semi diameter ends, wherein Σ|InRS|=InRSO+InRSI while InRSO is a sum of absolute value of the displacement for each lens with refractive power from the central point on the object-side surface passed through by the optical axis to the point on the optical axis where the projection of a maximum effective semi diameter of the object-side surface ends, and InRSI is a sum of absolute value of the displacement for each lens with refractive power from the central point on the image-side surface passed through by the optical axis to the point on the optical axis where the projection of the maximum effective semi diameter of the image-side surface ends;
wherein both the image-side surface and the object-side surface of the first lens are convex at where the optical axis passes through.

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 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≦5 mm.

5. The optical image capturing system of claim 4 , wherein the optical image capturing system further satisfies:
0 degree<HAF≦70 degrees;

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 optical image capturing system further satisfies:
0.45≦InTL/HOS≦0.9.

7. The optical image capturing system of claim 1 , further comprising an image sensor on the image plane, wherein the optical image capturing system further satisfies:
0<HOS/HOI≦1.63;

where HOI is a half of a diagonal line of an effective sensing area of the image sensor.

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 along the optical axis between the aperture and the image plane.

9. 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 positive refractive power; and
an image plane;
wherein the optical image capturing system consists of the three lenses with refractive power; at least two of the lenses from the first lens to the third lens each has at least an inflection point on at least a surface thereof; the third lens has positive refractive power; each of 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, 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 ≦1.42; and 0<Σ|InRS|/InTL≦3;

where 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 along the optical axis between the object-side surface of the first lens and the image plane; InTL is a distance between the object-side surface of the first lens and the image-side surface of the third lens along the optical axis; and Σ|InRS| is a sum of absolute values of a displacement for each lens with refractive power from a central point passed through by the optical axis to a point on the optical axis where a projection of a maximum effective semi diameter ends, wherein Σ|InRS|=InRSO+InRSI while InRSO is a sum of absolute value of the displacement for each lens with refractive power from the central point on the object-side surface passed through by the optical axis to the point on the optical axis where the projection of the maximum effective semi diameter of the object-side surface ends, and InRSI is a sum of absolute value of the displacement for each lens with refractive power from the central point on the image-side surface passed through by the optical axis to the point on the optical axis where the projection of the maximum effective semi diameter of the image-side surface ends;
wherein both the image-side surface and the object-side surface of the first lens are convex where the optical axis passes through.

10. The optical image capturing system of claim 9 , wherein the third lens has positive refractive power; and at least one of the object-side surface and the image-side surface of the third lens has at least an inflection point.

11. The optical image capturing system of claim 9 , 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; ΣPPR is a sum of the PPRs.

12. The optical image capturing system of claim 9 , 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.

13. The optical image capturing system of claim 9 , wherein the optical image capturing system further satisfies:
0 mm<Σ|InRS|≦10 mm.

14. The optical image capturing system of claim 9 , wherein the optical image capturing system further satisfies:
0 mm<|InRS21|+|InRS22|+|InRS31|+|InRS32|≦18 mm;

where InRS21 is a displacement from a point on the object-side surface of the second lens passed through by the optical axis to a point on the optical axis where a projection of a maximum effective semi diameter of the object-side surface of the second lens ends; InRS22 is a displacement from a point on the image-side surface of the second lens passed through by the optical axis to a point on the optical axis where a projection of the maximum effective semi diameter of the image-side surface of the second lens ends; InRS31 is a displacement from a point on the object-side surface of the third lens passed through by the optical axis to a point on the optical axis where a projection of the maximum effective semi

Assignees

• Ability Opto Electronics Technology Co Ltd

Inventors

• Liu yao-wei
• Chang Yeong-Ming

Classifications

• G02B13/0035 Primary

  having three lenses · CPC title

• G02B13/001

  Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras (G02B23/243 takes precedence) · CPC title

• G02B13/002

  having at least one aspherical surface · CPC title

• G02B9/16

  all the components being simple · CPC title

• G02B9/14

  arranged + - + · CPC title