Optical image capturing system

Patent metadata

Field	Value
Publication number	US-10203485-B2
Application number	US-201615386828-A
Country	US
Kind code	B2
Filing date	Dec 21, 2016
Priority date	Aug 23, 2016
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

A six-piece optical lens for capturing image and a six-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 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, a fifth lens element with refractive power and a sixth element lens with refractive power. At least one of the image-side surface and object-side surface of each of the six lens elements is 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, 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;
a fifth lens element with refractive power;
a sixth lens element with refractive power;
a first image plane, which is an image plane specifically for visible light and perpendicular to an optical axis; a through-focus modulation transfer rate (value of MTF) at a first spatial frequency having a maximum value at central field of view of the first image plane; and
a second image plane, which is an image plane specifically for infrared light and perpendicular to the optical axis; the through-focus modulation transfer rate (value of MTF) at the first spatial frequency having a maximum value at central of field of view of the second image plane;
wherein the optical image capturing system comprises only six lens elements with refractive powers, and the optical image capturing system has a maximum image height HOI on the first image plane that is perpendicular to the optical axis; at least one of the six lens elements has positive refractive power; focal lengths of the six lens elements are respectively f 1 , f 2 , f 3 , f 4 , f 5 and f 6 , and 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 the optical axis from an object-side surface of the first lens element to the first 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 sixth lens element is InTL, half of a maximum angle of view of the optical image capturing system is denoted by HAF; a distance on the optical axis between the first image plane and the second image plane is denoted by FS; thicknesses of the first through sixth lens elements at a height of ½ HEP and in parallel with the optical axis are ETP 1 , ETP 2 , ETP 3 , ETP 4 , ETP 5 and ETP 6 , respectively; a sum of ETP 1 to ETP 6 is SETP, thicknesses of the first through sixth lens elements on the optical axis are TP 1 , TP 2 , TP 3 , TP 4 , TP 5 and TP 6 , respectively; a sum of TP 1 to TP 6 is STP, and the following conditions are satisfied: 1.0≤f/HEP≤10.0, 0 deg<HAF≤150 deg, 0.2≤SETP/STP<1, and |FS|≤60 μm.

2. The optical image capturing system of claim 1 , wherein a wavelength of the infrared light ranges from 700 nm to 1300 nm, and the first spatial frequency is denoted by SP 1 , which satisfies the following condition: SP 1 ≤440 cycles/mm.

3. The optical image capturing system of claim 1 , wherein a horizontal distance paralleling the optical axis from a coordinate point on the object-side surface of the first lens element at a height of ½ HEP to the first image plane is ETL, a horizontal distance paralleling the optical axis from the coordinate point on the object-side surface of the first lens element at the height of ½ HEP to a coordinate point on the image-side surface of the sixth lens element at a height of ½ HEP is EIN, and the following condition is satisfied: 0.2≤EIN/ETL <1.

4. The optical image capturing system of claim 1 , wherein there is an air gap between any pair of adjacent lens elements among the six lens elements.

5. The optical image capturing system of claim 1 , wherein the optical image capturing system satisfies the following condition: HOS/HOI≥1.2.

6. The optical image capturing system of claim 1 , wherein a horizontal distance paralleling the optical axis from the coordinate point on the object-side surface of the first lens element at the height of ½ HEP to a coordinate point on the image-side surface of the sixth lens element at the height of ½ HEP is EIN, which satisfies the condition as follows: 0.25≤SETP/EIN<1.

7. The optical image capturing system of claim 1 , wherein a horizontal distance paralleling the optical axis from a coordinate point on the image-side surface of the sixth lens element at the height of ½ HEP to the first image plane is EBL, a horizontal distance paralleling the optical axis from an axial point on the image-side surface of the sixth lens element to the first image plane is BL, and conditions as follows are satisfied: 0.1≤EBL/BL≤1.1.

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

9. 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;
a fifth lens element with refractive power;
a sixth lens element with refractive power;
a first image plane, which is an image plane specifically for visible light and perpendicular to an optical axis; a through-focus modulation transfer rate (value of MTF) at a first spatial frequency having a maximum value at central field of view of the first image plane, and the first spatial frequency being 110 cycles/mm; and
a second image plane, which is an image plane specifically for infrared light and perpendicular to the optical axis; the through-focus modulation transfer rate (value of MTF) at the first spatial frequency having a maximum value at central of field of view of the second image plane, and the first spatial frequency being 110 cycles/mm,
wherein the optical image capturing system comprises only six lens elements with refractive powers; the optical image capturing system has a maximum image height HOI on the first image plane that is perpendicular to the optical axis; at least one of the six elements is made of glass and has positive refractive power; focal lengths of the six lens elements are respectively f 1 , f 2 , f 3 , f 4 , f 5 and f 6 ; a focal length of the optical image capturing system is f; an entrance pupil diameter of the optical image capturing system is denoted by HEP; a distance on an optical axis from an object-side surface of the first lens element to the first 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 sixth lens element is InTL, and half of a maximum angle of view of the optical image capturing system is denoted by HAF; a distance on the optical axis between the first image plane and the second image plane is denoted by FS; a horizontal distance paralleling the optical axis from a coordinate point on the object-side surface of the first lens element at a height of ½ HEP to the first image plane is ETL, a horizontal distance paralleling the optical axis from the coordinate point on the object-side surface of the first lens element at the height of ½ HEP to a coordinate point on the image-side surface of the sixth lens element at a height of ½ HEP is EIN, and conditions as follows are satisfied: 1≤f/HEP≤10, 0 deg<HAF≤150 deg, 0.2≤EIN/ETL<1, and |FS|≤60 μm.

10. The optical image capturing system of claim 9 , wherein there is an air gap between any pair of adjacent lens elements among the six lens elements.

11. The optical image capturing system of claim 9 , wherein modulation transfer rates of visible light at spatial frequency of 110 cycles/mm at positions of the optical axis, 0.3 HOT and 0.7 HOI on the first image plane are respectively denoted by MTFQ 0 , MTFQ 3 and MTFQ 7 , and conditions as follows are satisfied: MTFQ 0 ≥0.2, MTFQ 3 ≥0.01, and MTFQ 7 ≥0.01.

12. The optical image capturing sys

Assignees

• Ability Opto Electronics Technology Co Ltd

Inventors

• Chang Yeong-Ming
• Lai Chien-Hsun
• Liu yao-wei

Classifications

• G02B13/18

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

• G02B5/226

  Glass filters · CPC title

• G02B13/14

  for use with infrared or ultraviolet radiation ({G02B13/008, } G02B13/16 take precedence) · CPC title

• G02B13/0045 Primary

  having five or more lenses · CPC title

• G02B9/62

  having six components only · CPC title