Optical image capturing system

Patent metadata

Field	Value
Publication number	US-2016223784-A1
Application number	US-201514817537-A
Country	US
Kind code	A1
Filing date	Aug 4, 2015
Priority date	Jan 29, 2015
Publication date	Aug 4, 2016
Grant date	—

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 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 of the second lens and the third lens 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≦ 1.42; and 0<Σ|InRS|/InTL≦3;

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; and 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 between the object-side surface of the first lens and the image-side surface of the third lens; and Σ|InRS| is of an sum of absolute values of the displacements in parallel with the optical axis of each lens with refractive power from the central point to the point at the maximum effective semi diameter, i.e. Σ|InRS|=InRSO+InRSI while InRSO is of a sum of absolute values of the displacements in parallel with the optical axis of each lens with refractive power from the central point on the object-side surface to the point at the maximum effective semi diameter of the object-side surface and InRSI is of a sum of absolute values of the displacements in parallel with the optical axis of each lens with refractive power from the central point on the image-side surface to the point at the maximum effective semi diameter of the image-side surface.

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 second lens has negative refractive power.

7 . The optical image capturing system of claim 1 , wherein the optical image capturing system further satisfies:
0.45≦InTL/HOS≦0.9.

8 . 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.

9 . 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.

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; 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; at least one of the second lens and the third lens 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≦ 1.42; and 0<Σ|InRS|/InTL≦3;

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 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; and Σ|InRS| is of an sum of absolute values of the displacements in parallel with the optical axis of each lens with refractive power from the central point to the point at the maximum effective semi diameter, i.e. Σ|InRS|=InRSO+InRSI while InRSO is of a sum of absolute values of the displacements in parallel with the optical axis of each lens with refractive power from the central point on the object-side surface to the point at the maximum effective semi diameter of the object-side surface and InRSI is of a sum of absolute values of the displacements in parallel with the optical axis of each lens with refractive power from the central point on the image-side surface to the point at the maximum effective semi diameter of the image-side surface.

11 . The optical image capturing system of claim 10 , 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.

12 . The optical image capturing system of claim 10 , 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.

13 . The optical image capturing system of claim 10 , 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.

14 . The optical image capturing system of claim 10 , wherein the second lens has negative refractive power.

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

16 . The optical image capturing system of claim 10 , wherein the optical image capturing system further satisfies:
0 mm<|InRS21|+|InRS22|+|InRS31|+|InRS32|≦8 mm;
where InRS21 is a displacement in parallel with the optical axis from a point on the object-side surface of the second lens, through which the optical axis passes, to a point at the maximum effective semi diameter of the object-side surface of the second lens; InRS22 is a displacement in parallel with the optical axis from a point on the image-side surface of the second lens, through which the optical axis passes, to a point at the maximum effective semi diameter of the image-side surface of the second lens; InRS31 is a displacement in parallel with the optical axis from a point on the object-side surface of the third lens, through which the optical axis passes, to a point at the maximum effective semi diameter of the object-side surface of the third

Assignees

• Ability Opto Electronics Technology Co Ltd

Inventors

• Liu yao-wei
• Chang Yeong-Ming

Classifications

• G02B9/12

  having three components only · CPC title

• G02B13/0035 Primary

  having three lenses · CPC title

• H04N5/2254

  Electricity · mapped topic

• G02B13/001

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

• G02B9/14

  arranged + - + · CPC title