Optical image capturing system

Patent metadata

Field	Value
Publication number	US-10048464-B2
Application number	US-201615367519-A
Country	US
Kind code	B2
Filing date	Dec 2, 2016
Priority date	Mar 25, 2016
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

The invention discloses a three-piece optical lens for capturing image and a three-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 positive refractive power;
a second lens having negative 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 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; the image-side surface of the first lens has a first image-side bearing surface; the object-side surface of the second lens has a second object-side bearing surface, and the image-side surface of the second lens has a second image-side bearing surface, wherein the second object-side bearing surface and the first image-side bearing surface contact each other;
wherein the optical image capturing system satisfies:
1.0≤ f/HEP≤ 10.0;

0 deg< HAF≤ 150 deg; and
0.9≤2( ARE/HEP )≤2.0;

where f is a focal length of the optical image capturing system; HOI is a maximum height for image formation on the image plane; HEP is an entrance pupil diameter of the optical image capturing system; HOS is a distance between an object-side surface of the first lens and the image plane on the optical axis; InTL is a distance in parallel with the optical axis from the object-side surface of the first lens to the image-side surface of the third lens; HAF is a half of a maximum view angle of the optical image capturing system; for any surface of any 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.

2. The optical image capturing system of claim 1 , wherein the object-side surface of the third lens has a third object-side bearing surface, and the image-side surface of the third lens has a third image-side bearing surface; the third object-side bearing surface and the second image-side bearing surface contact each other.

3. The optical image capturing system of claim 2 , wherein the optical image capturing system satisfies:
0 deg< IAG≤ 90 deg;
where an extension line of each image-side bearing surface among the first to the third image-side bearing surfaces intersects the optical axis at an included angle JAG; the included angles are respectively denoted as IAG1, IAG2, and IAG3 for the first to the third image-side bearing surfaces.

4. The optical image capturing system of claim 3 , wherein the optical image capturing system satisfies:
IAG 1= IAG 2= IAG 3.

5. The optical image capturing system of claim 2 , wherein the optical image capturing system satisfies:
0 deg < OAG≤ 90 deg;
where an extension line of each object-side bearing surface among the second to the third object-side bearing surfaces intersects the optical axis at an included angle OAG; the included angles are respectively denoted as OAG2 and OAG3 for the second to the third object-side bearing surfaces.

6. The optical image capturing system of claim 5 , wherein the optical image capturing system satisfies:
OAG 2= OAG 3.

7. The optical image capturing system of claim 1 , wherein the optical image capturing system satisfies:
0.9≤ ARS/EHD≤ 2.0;

wherein EHD is a maximum effective half diameter of any surface of any lens among the first lens to the third lens; for any surface of any lens among the first lens to the third lens, a start point is defined at where the optical axis passes through said surface, and an end point is defined at where the maximum effective half diameter of said surface ends along a surface profile thereof; ARS is the curve length between the start point and the end point.

8. The optical image capturing system of claim 1 , wherein the optical image capturing system satisfies:
PLTA ≤200 μm;

PSTA ≤200 μm;

NLTA ≤200 μm;

NSTA ≤200 μm;

SLTA ≤200 μm;

SSTA ≤200 μm; and

| TDT|< 250%;
where TDT is a TV distortion; HOI is a maximum height for image formation 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 of visible light passing through an edge of the aperture; PSTA is a transverse aberration at 0.7 HOT on the image plane in the positive direction of the tangential fan after a shortest operation wavelength of visible light 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 of visible light passing through the edge of the aperture; NSTA is a transverse aberration at 0.7 HOT on the image plane in the negative direction of the tangential fan after the shortest operation wavelength of visible light passing through the edge of the aperture; SLTA is a transverse aberration at 0.7 HOT on the image plane of a sagittal fan of the optical image capturing system after the longest operation wavelength of visible light passing through the edge of the aperture; SSTA is a transverse aberration at 0.7 HOT on the image plane of a sagittal fan after the shortest operation wavelength of visible light passing through the edge of the aperture.

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 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 positive refractive power;
a second lens having negative 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 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; the image-side surface of the first lens has a first image-side bearing surface; the object-side surface of the second lens has a second object-side bearing surface, and the image-side surface of the second lens has a second image-side bearing surface, wherein the second object-side bearing surface and the first image-side bearing surface contact each other; the object-side surface of the third lens has a third object-side bearing surface, and the image-side surface of the third lens has a third image-side bearing surface, wherein the third object-side bearing surface and the second image-side bearing surface contact each other; an extension line of each image-side bearing surface among the first to the second image-side bearing surfaces intersects the optical axis at an included angle IAG; the included angles are respectively denoted as IAG1 and IAG2 for the first to the second image-side bearing surfaces; an extension line of each object-side bearing surface among the second to the third object-side bearing surfaces intersects the optical axis at an included angle OAG; the included angles are respectively denoted as OAG2 and OAG3 for the second to the third object-side bearing surfaces;
wherein the optical image capturing system satisfies:
0 deg < IAG≤ 90 deg;
0 de

Assignees

• Ability Opto Electronics Technology Co Ltd

Inventors

• Lai Chien-Hsun
• Tang Nai-Yuan
• Liu yao-wei
• Chang Yeong-Ming

Classifications

• G02B9/12

  having three components only · CPC title

• G02B27/0025

  for optical correction, e.g. distorsion, aberration · CPC title

• G02B5/005

  Diaphragms (for cameras G03B9/02) · CPC title

• G02B7/021

  for more than one lens · CPC title

• G02B9/14

  arranged + - + · CPC title