Optical image capturing system

Patent metadata

Field	Value
Publication number	US-10317644-B2
Application number	US-201514861204-A
Country	US
Kind code	B2
Filing date	Sep 22, 2015
Priority date	Jun 4, 2015
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

A four-piece optical lens for capturing image is provided. In order from an object side to an image side, the optical lens along the optical axis includes a first lens with positive refractive power, a second lens with refractive power, a third lens with refractive power and a fourth lens with refractive power. At least one of the image-side surface and object-side surface of each of the four lens elements are aspheric. The optical lens 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, from an object side to an image side, comprising:
a first lens element with refractive power;
a second lens element with refractive power;
a third lens element with refractive power;
a fourth lens element with refractive power; and
an image plane;
wherein the optical image capturing system consists of the four lens elements with refractive power, at least one of the first through fourth lens elements has positive refractive power, an object-side surface and an image-side surface of the fourth lens element are aspheric, a focal length of the optical image capturing system is f, an entrance pupil diameter of the optical image capturing system is HEP, a distance from an object-side surface of the first lens element to the image plane is HOS, a distance on an optical axis from the object-side surface of the first lens element to the image-side surface of the fourth lens element is InTL, a length of outline curve from an axial point on any surface of any one of the four lens elements to a coordinate point of vertical height with a distance of a half of the entrance pupil diameter from the optical axis on the surface along an outline of the surface is denoted as ARE, TV distortion for image formation in the optical image capturing system is TDT, a height for image formation on the image plane perpendicular to the optical axis in the optical image capturing system is denoted by HOI, a lateral aberration of the longest operation wavelength of a positive direction tangential fan of the optical image capturing system passing through an edge of the entrance pupil and incident on the image plane by 0.7 HOI is denoted as PLTA, and a lateral aberration of the shortest operation wavelength of the positive direction tangential fan of the optical image capturing system passing through the edge of the entrance pupil and incident on the image plane by 0.7 HOI is denoted as PSTA, a lateral aberration of the longest operation wavelength of a negative direction tangential fan of the optical image capturing system passing through the edge of the entrance pupil and incident on the image plane by 0.7 HOI is denoted as NLTA, a lateral aberration of the shortest operation wavelength of a negative direction tangential fan of the optical image capturing system passing through the edge of the entrance pupil and incident on the image plane by 0.7 HOI is denoted as NSTA, a lateral aberration of the longest operation wavelength of a sagittal fan of the optical image capturing system passing through the edge of the entrance pupil and incident on the image plane by 0.7 HOI is denoted as SLTA, a lateral aberration of the shortest operation wavelength of the sagittal fan of the optical image capturing system passing through the edge of the entrance pupil and incident on the image plane by 0.7 HOI is denoted as SSTA, and the following relations are satisfied: 1.2≤f/HEP≤6.0; 0.5≤HOS/f≤3.0; 0<InTL/HOS<0.9; 1≤2(ARE/HEP)≤1.5; PLTA≤20 μm, PSTA≤20 μm, NLTA≤20 μm, NSTA≤20 μm, SLTA≤20 μm and SSTA≤20 μm; |TDT|<100%.

2. The optical image capturing system of claim 1 , wherein a maximum effective half diameter position of any surface of any one of the four lens elements is denoted as EHD, and a length of outline curve from an axial point on any surface of any one of the four lens elements to the maximum effective half diameter position of the surface along the outline of the surface is denoted as ARS, and the following relation is satisfied: 1≤ARS/EHD≤1.5.

3. The optical image capturing system of claim 1 , wherein the following relation is satisfied: 0 mm<HOS≤10 mm.

4. The optical image capturing system of claim 1 , wherein a half of a maximal view angle of the optical image capturing system is HAF, and the following relation is satisfied: 0 deg<HAF≤80 deg.

5. The optical image capturing system of claim 1 , wherein a length of outline curve from an axial point on the object-side surface of the fourth lens element to a coordinate point of vertical height with a distance of a half of the entrance pupil diameter from the optical axis on the surface along an outline of the surface is denoted as ARE41; a length of outline curve from an axial point on the image-side surface of the fourth lens element to the coordinate point of vertical height with the distance of a half of the entrance pupil diameter from the optical axis on the surface along the outline of the surface is denoted as ARE42, and a thickness of the fourth lens element on the optical axis is TP4, and the following relations are satisfied: 0.5≤ARE41/TP4 TP4≤15; and 0.5≤ARE42/TP4≤15.

6. The optical image capturing system of claim 1 , wherein a length of outline curve from an axial point on the object-side surface of the third lens element to a coordinate point of vertical height with a distance of a half of the entrance pupil diameter from the optical axis on the surface along an outline of the surface is denoted as ARE31; a length of outline curve from an axial point on the image-side surface of the third lens element to the coordinate point of vertical height with the distance of a half of the entrance pupil diameter from the optical axis on the surface along the outline of the surface is denoted as ARE32, and a thickness of the third lens element on the optical axis is TP3, and the following relations are satisfied: 0.5≤ARE31/TP3≤15 and 0.5≤ARE32/TP3≤15.

7. The optical image capturing system of claim 1 , wherein the second lens element has a negative refractive power and the fourth lens element has a negative refractive power.

8. The optical image capturing system of claim 1 , further comprising an aperture stop, a distance from the aperture stop to the image plane on the optical axis is InS, a height for image formation on the image plane perpendicular to the optical axis in the optical image capturing system is HOI and the following relation is satisfied: 0.2≤InS/HOS≤ 1.1 and 0.5<HOS/HOI≤1.6.

9. An optical image capturing system, from an object side to an image side, comprising:
a first lens element with positive refractive power;
a second lens element with refractive power;
a third lens element with refractive power;
a fourth lens element with refractive power; and
an image plane;
wherein the optical image capturing system consists of the four lens elements with refractive power, at least two lens elements among the first through fourth lens elements respectively have at least one inflection point on at least one surface thereof, at least one of the second through fourth lens elements has positive refractive power, an object-side surface and an image-side surface of the fourth lens element are aspheric, a focal length of the optical image capturing system is f, an entrance pupil diameter of the optical image capturing system is HEP, a distance from an object-side surface of the first lens element to the image plane is HOS, a distance on an optical axis from the object-side surface of the first lens element to the image-side surface of the fourth lens element is InTL, a length of outline curve from an axial point on any surface of any one of the four lens elements to a coordinate point of vertical height with a distance of a half of the entrance pupil diameter from the optical axis on the surface along an outline of the surface is denoted as ARE, a height for image formation on the image plane perpendicular to the optical axis in the optical image capturing system is denoted by HOI, a lateral aberration of the longest operation wavelength of a positive direction tangential fan of the optical image capturing system passing through an edge of the entrance pupil and incident on the image plane by 0.7 HOI is denoted as PLTA, and a lateral aberration of the shortest operation waveleng

Assignees

• Ability Opto Electronics Technology Co Ltd

Inventors

• Liu yao-wei
• Chang Yeong-Ming

Classifications

• G02B13/004 Primary

  having four lenses · CPC title