Optical image capturing system

Patent metadata

Field	Value
Publication number	US-9989735-B2
Application number	US-201615358550-A
Country	US
Kind code	B2
Filing date	Nov 22, 2016
Priority date	Jun 2, 2016
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

A four-piece optical lens for capturing image and a five-piece optical module for capturing image are provided. In the 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; and 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 comprises four lens elements with refractive power, at least one of the four lens elements has positive refractive power; focal lengths of the four lens elements are respectively f1, f2, f3 and f4; a focal length of the optical image capturing system is f, and an entrance pupil diameter of the optical image capturing system is HEP; a distance on an optical axis from an object-side surface of the first lens element to the image plane is HOS, a distance on the optical axis from the object-side surface of the first lens element to an image-side surface of the fourth lens element is InTL, half of a maximum viewable angle of the optical image capturing system is denoted by HAF; an outline curve starting from an axial point on any surface of any one of the four lens elements, tracing along an outline of the surface, and ending at a coordinate point on the surface that has a vertical height of ½ entrance pupil diameter from the optical axis, has a length denoted by ARE; conditions as follows are satisfied: 1≤f/HEP≤10, 0 deg≤HAF≤150 deg, and 0.9≤2 (ARE/HEP)≤2.0.

2. The optical image capturing system of claim 1 , wherein TV distortion for image formation in the optical image capturing system is TDT; the optical image capturing system has a maximum image height HOI on the image plane perpendicular to the optical axis, transverse aberration of a longest operation wavelength of a positive direction tangential fan of the optical image capturing system passing through an edge of an entrance pupil and incident at a position of 0.7 HOI on the image plane is denoted by PLTA, and transverse aberration of a 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 at the position of 0.7 HOI on the image plane is denoted by PSTA; transverse 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 at the position of 0.7 HOI on the image plane is denoted by NLTA, and transverse 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 at the position of 0.7 HOI on the image plane is denoted by NSTA; transverse 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 at the position of 0.7 HOI on the image plane is denoted by SLTA, transverse 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 at the position of 0.7 HOI on the image plane is denoted by SSTA; conditions as follows are satisfied: PLTA≤100 μm; PSTA≤100 μm; NLTA≤100 μm; NSTA≤100 μm; SLTA≤100 μm; and SSTA≤100 μm; and |TDT|<100%.

3. The optical image capturing system of claim 1 , wherein a maximum effective half diameter of any surface of any one of the four lens elements is denoted by EHD; an outline curve starting from the axial point on any surface of any one of those lens elements, tracing along an outline of the surface, and ending at a point which defines the maximum effective half diameter, has a length denoted by ARS; conditions as follows are satisfied: 0.9≤ARS/EHD≤2.0.

4. The optical image capturing system of claim 1 , satisfying conditions as follows: 0 mm<HOS≤50 mm.

5. The optical image capturing system of claim 1 , wherein the image plane is a plane or a curved surface.

6. The optical image capturing system of claim 1 , wherein the outline curve starting from the axial point on the object-side surface of the fourth lens elements, tracing along the outline of the object-side surface, and ending at the coordinate point on the surface that has the vertical height of ½ entrance pupil diameter from the optical axis, has the length denoted by ARE41; the outline curve starting from the axial point on the image-side surface of the fourth lens elements, tracing along the outline of the image-side surface, and ending at the coordinate point on the surface that has a vertical height of ½ entrance pupil diameter from the optical axis, has the length denoted by ARE42; a central thickness of the fourth lens element on the optical axis is TP4, which satisfies conditions as follows: 0.05≤ARE41/TP4≤25 and 0.05≤ARE42/TP4≤25.

7. The optical image capturing system of claim 1 , wherein the outline curve starting from the axial point on the object-side surface of the third lens elements, tracing along the outline of the object-side surface, and ending at the coordinate point on the surface that has the vertical height of ½ entrance pupil diameter from the optical axis, has the length denoted by ARE31; the outline curve starting from the axial point on the image-side surface of the third lens elements, tracing along the outline of the image-side surface, and ending at the coordinate point on the surface that has the vertical height of ½ entrance pupil diameter from the optical axis, has the length denoted by ARE32; a central thickness of the third lens element on the optical axis is TP3, which satisfies conditions as follows: 0.05≤ARE31/TP3≤25 and 0.05≤ARE32/TP3≤25.

8. The optical image capturing system of claim 1 , wherein the first lens element has negative refractive power.

9. The optical image capturing system of claim 1 , further comprising an aperture stop; wherein a distance from the aperture stop to the image plane on the optical axis is InS, which satisfies condition as follows: 0.2≤InS/HOS≤1.1.

10. 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 comprises four lens elements with refractive power, at least one of the four lens elements has at least one inflection point on at least one surface thereof; at least one of the second lens element to fourth lens element has positive refractive power; focal lengths of the four lens elements are respectively f1, f2, f3 and f4; 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 on an optical axis from an object-side surface of the first lens element to the image plane is HOS, a distance on the optical axis from the object-side surface of the first lens element to an image-side surface of the fourth lens element is InTL, half of a maximum viewable angle of the optical image capturing system is denoted by HAF; an outline curve starting from an axial point on any surface of any one of the four lens elements, tracing along an outline of the surface, and ending at a coordinate point on the surface that has a vertical height of ½ entrance pupil diameter from the optical axis, has a length denoted by ARE; conditions as follows are satisfied: 1≤f/HEP≤10, 0 deg≤HAF≤150 deg, and 0.9≤2 (ARE/HEP)≤2.0.

11. The optical image capturing system of claim 10 , wherein a maximum effective half diameter of any surface of any one of the four lens elements is denoted by

Assignees

• Ability Opto Electronics Technology Co Ltd
• Ability Opto Electronics Technology Co Ltd

Inventors

• Lai Chien-Hsun
• Tang Nai-Yuan
• Chang Yeong-Ming

Classifications

• G02B5/005

  Diaphragms (for cameras G03B9/02) · CPC title

• G02B27/0025

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

• G02B13/004 Primary

  having four lenses · CPC title

• G02B5/208

  for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation · CPC title

• G02B9/34

  having four components only · CPC title