Optical image capturing system

Patent metadata

Field	Value
Publication number	US-9964735-B2
Application number	US-201615292551-A
Country	US
Kind code	B2
Filing date	Oct 13, 2016
Priority date	Apr 22, 2016
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

An optical image capturing system is provided. In the order from an object side to an image side, the optical image capturing system 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 is 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;
an image plane; and
a lens positioning element;
wherein the lens positioning element is hollow in order to accommodate any lens elements and align the lens elements along an optical axis; the lens positioning element comprises an object-side end and an image-side end; the object-side end is adjacent to the object side and is disposed with a first opening; the image-side end is adjacent to the image side and is disposed with a second opening; an outer wall of the lens positioning element comprises at least two tangent planes, and each of the tangent planes is disposed with at least one sprue mark; the optical image capturing system comprises four lens elements with refractive powers; at least one lens element among the first to the fourth lens elements has positive refractive power; focal lengths of the first through the fourth 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, and a distance on the optical axis from the 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 angle of view of the optical image capturing system is 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 the outer wall of the lens positioning element comprises at least three tangent planes and each of the tangent planes has at least one sprue mark.

3. The optical image capturing system of claim 1 , wherein an inner diameter of the first opening is OD, an inner diameter of the second opening is ID, and the following conditions are satisfied: 0.1≤OD/ID≤10.

4. The optical image capturing system of claim 1 , wherein a minimum thickness of the object-side end is OT and a minimum thickness of the image-side end is IT, and the following condition is satisfied: 0.1≤OT/IT≤10.

5. 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, a transverse 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 at a position of 0.7 HOI on the image plane is denoted by PLTA, and a transverse 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 at the position of 0.7 HOI on the image plane is denoted by PSTA; a 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 a 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; a 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, a 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 nm; and SSTA≤100 μm; and |TDT|<100%.

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

7. The optical image capturing system of claim 1 , wherein an outline curve starting from an axial point on an object-side surface of the fourth lens elements, tracing along an outline of the object-side 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 ARE41; an outline curve starting from an axial point on an image-side surface of the fourth lens elements, tracing along an outline of the image-side 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 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.

8. The optical image capturing system of claim 1 , wherein an outline curve starting from an axial point on an object-side surface of the third lens elements, tracing along an outline of the object-side 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 ARE31; an outline curve starting from an axial point on an image-side surface of the third lens elements, tracing along an outline of the image-side 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 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.

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;
an image plane; and
a lens positioning element,
wherein the lens positioning element is hollow to accommodate any lens elements and align the lens elements along an optical axis; the lens positioning element comprises an object-side end and an image-side end; the object-side end is adjacent to the object side and is disposed with a first opening, and the image-side end is adjacent to the image side and is disposed with a second opening; an outer wall of the lens positioning element comprises at two tangent planes, and each of the tangent planes has at least one sprue mark; the optical image capturing system comprises four lens elements with refractive powers; at least one surface of at least one lens element among the first to the fourth lens elements has at least one inflection point; at least one lens element among the second to the fourth lens elements has positive r

Assignees

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

Inventors

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

Classifications

• G02B7/022

  lens and mount having complementary engagement means, e.g. screw/thread · CPC title

• G02B13/06

  Panoramic objectives; So-called "sky lenses" {including panoramic objectives having reflecting surfaces} · CPC title

• G02B27/646

  compensating for small deviations, e.g. due to vibration or shake (movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68) · CPC title

• G02B27/0025

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