Optical Image Capturing System

Patent metadata

Field	Value
Publication number	US-2016306138-A1
Application number	US-201514744437-A
Country	US
Kind code	A1
Filing date	Jun 19, 2015
Priority date	Apr 17, 2015
Publication date	Oct 20, 2016
Grant date	—

Abstract

An optical image capturing system, sequentially including a first lens element, a second lens element, a third lens element and a fourth lens element from an object side to an image side, is disclosed. The first lens element has positive refractive power. The second lens element, the third lens element and the fourth lens element have refractive power respectively. At least one of the image side surface and the object side surface of each of the four lens elements are aspheric. The optical lens elements can increase aperture value and improve the imagining quality for use in compact cameras.

First claim

1 . 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 four lens elements with refractive power, at least two lens elements among the four 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, focal lengths of the first through fourth lens elements are f1, f2, f3 and f4 respectively, 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 from the object-side surface of the first lens element to the image-side surface of the fourth lens element on an optical axis is InTL, a sum of an absolute value of each distance in parallel with the optical axis from a maximum effective half diameter position on an object-side surface of each of the four lens elements to an axial point on the object-side surface of each of the four lens elements is InRSO, a sum of an absolute value of each distance in parallel with the optical axis from a maximum effective half diameter position on an image-side surface of each of the four lens elements to an axial point on the image-side surface of each of the four lens elements is InRSI, a sum of InRSO and InRSI is Σ|InRS|, and the following relations are satisfied: 1.2≦f/HEP≦6.0, 0.5≦HOS/f≦3.0 and 0<Σ|InRS|/InTL≦3.

2 . The optical image capturing system of claim 1 , wherein TV distortion for image formation in the optical image capturing system is TDT, optical distortion for image formation in the optical image capturing system is ODT, a half of view angle of the optical image capturing system is HAF, and the following relations are satisfied: 0 deg<HAF≦70 deg, |TDT|<60% and |ODT|<50%.

3 . The optical image capturing system of claim 1 , wherein the third lens element and the fourth lens element have at least one inflection point on at least one surface respectively.

4 . The optical image capturing system of claim 3 , wherein the fourth lens element has at least one inflection point on any one surface.

5 . The optical image capturing system of claim 3 , wherein the first lens element and the second lens element have at least one inflection point on at least one surface respectively.

6 . The optical image capturing system of claim 1 , wherein a distance perpendicular to the optical axis between the inflection point and the optical axis is HIF, and the following relation is satisfied: 0 mm<HIF≦5 mm.

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

8 . The optical image capturing system of claim 1 , wherein a distance from the object-side surface of the first lens element to the image-side surface of the fourth lens element is InTL and the following relation is satisfied: 0.5≦InTL/HOS≦0.9.

9 . The optical image capturing system of claim 5 , further comprising an aperture stop, a distance from the aperture stop to the image plane on the optical axis is InS, an image sensing device is disposed on the image plane, a half of a diagonal of an effective detection field of the image sensing device is HOI, and the following relations are satisfied: 0.5≦InS/HOS≦1.2 and 0<HIF/HOI≦0.9.

10 . 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 four lens elements with refractive power, at least two lens elements among the four 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, focal lengths of the first through fourth lens elements are f1, f2, f3 and f4, respectively, 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 from the object-side surface of the first lens element to the image-side surface of the fourth lens element on an optical axis is InTL, a sum of an absolute value of each distance in parallel with the optical axis from a maximum effective half diameter position on an object-side surface of each of the four lens elements to an axial point on the object-side surface of each of the four lens elements is InRSO, a sum of an absolute value of each distance in parallel with the optical axis from a maximum effective half diameter position on an image-side surface of each of the four lens elements to an axial point on the image-side surface of each of the four lens elements is InRSI, a sum of InRSO and InRSI is Σ|InRS|, and the following relations are satisfied: 1.2≦f/HEP≦6.0, 0.5≦HOS/f≦3.0 0<Σ|InRS|/InTL≦3, and 0 mm<HOS≦7 mm.

11 . The optical image capturing system of claim 10 , wherein the third lens element and the fourth lens element have at least one inflection point on at least one surface respectively.

12 . The optical image capturing system of claim 10 , wherein the first lens element and the second lens element have at least one inflection point on at least one surface respectively.

13 . (canceled)

14 . The optical image capturing system of claim 10 , wherein a distance from the first lens element to the second lens element on the optical axis is IN12, and the following relation is satisfied: 0<IN12/f≦0.2.

15 . The optical image capturing system of claim 10 , wherein a distance from the third lens element to the fourth lens element on the optical axis is IN34, and the following relation is satisfied: 0<IN34/f≦0.2.

16 . The optical image capturing system of claim 10 , wherein a central thicknesses of the third lens elements on the optical axis is TP3 and the following relation is satisfied: 0<TP3/f≦0.2.

17 . The optical image capturing system of claim 10 , wherein a distance in parallel with the optical axis from a maximum effective half diameter position to an axial point on the object-side surface of the third lens element is InRS31, a distance in parallel with the optical axis from a maximum effective half diameter position to an axial point on the image-side surface of the third lens element is InRS32, a distance in parallel with the optical axis from a maximum effective half diameter position to an axial point on the object-side surface of the fourth lens element is InRS41, a distance in parallel with the optical axis from a maximum effective half diameter position to an axial point on the image-side surface of the fourth lens element is InRS42, and the following relation is satisfied: 0<(|InRS31|+|InRS32|+|InRS41|+|InRS42|)/InTL≦2.

18 . The optical image capturing system of claim 10 , wherein a thickness of the second lens element and a thickness of the third lens element on the optical

Assignees

• Ability Opto Electronics Technology Co Ltd

Inventors

• Lee Hung-Wen
• Liu yao-wei
• Chang Yeong-Ming

Classifications

• H04N5/2254

  Electricity · mapped topic

• G02B13/004 Primary

  having four lenses · CPC title

• G02B9/34

  having four components only · CPC title

• G02B13/06

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

• G02B13/18

  with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)} · CPC title