Optical image capturing system

Patent metadata

Field	Value
Publication number	US-2018106979-A1
Application number	US-201715443686-A
Country	US
Kind code	A1
Filing date	Feb 27, 2017
Priority date	Oct 19, 2016
Publication date	Apr 19, 2018
Grant date	—

Abstract

An optical image capturing system including an imaging lens assembly having at least three lens elements for capturing image is provided. The optical image capturing system includes at least three pieces of lens elements; a first image plane for visible ray; a second image plane for infrared ray; and an image sensing device located between the first image plane the second image plane. The distance on the optical axis can be minimized by the design of said optical lens elements to improve the imaging quality of both visible ray and infrared ray in compact cameras.

First claim

What is claimed is:

1 . An optical image capturing system, comprising:
an imaging lens assembly, including at least three lens elements with refractive powers; a first image plane; a second image plane; and an image sensing device disposed between the first image plane and the second image plane;
wherein the first image plane 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 has a maximum value at central field of view of the first image plane; the second image plane 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 has a maximum value at central of field of view of the second image plane; a focal length of the imaging lens assembly is denoted by f, an entrance pupil diameter of the imaging lens assembly is HEP, 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 sum of thicknesses of the lens elements at a height of ½ HEP and parallel to the optical axis is denoted by SETP, and a sum of central thicknesses of the lens elements on the optical axis is denoted by STP, the following condition is satisfied: 1.0≤f/HEP≤10.0, 0 deg<HAF≤150 deg, |FS|≤60 μm, and 0.2≤SETP/STP<1.

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 SP1, which satisfies the following condition: SP1≤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 lens element that is closest to the first image plane 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 the imaging lens assembly comprises four lens elements with refractive powers, from an object side to an image side, the four lens elements are a first lens element, a second lens element, a third lens element, and a fourth lens element, a distance on the optical axis from an object-side surface of the first lens element to the first image plane is denoted by 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 denoted by InTL, and the following condition is satisfied: 0.1≤InTL/HOS≤0.95.

5 . The optical image capturing system of claim 1 , wherein the imaging lens assembly comprises five lens elements with refractive powers, from an object side to an image side, the five lens elements are a first lens element, a second lens element, a third lens element, a fourth lens element, and a fifth lens element, a distance on the optical axis from an object-side surface of the first lens element to the first image plane is denoted by HOS, a distance on the optical axis from the object-side surface of the first lens element to an image-side surface of the fifth lens element is denoted by InTL, and the following condition is satisfied: 0.1≤InTL/HOS≤0.95.

6 . The optical image capturing system of claim 1 , wherein the imaging lens assembly comprises six lens elements with refractive powers, from an object side to an image side, the five lens elements are a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element, a distance on the optical axis from an object-side surface of the first lens element to the first image plane is denoted by 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 denoted by InTL, and the following condition is satisfied: 0.1≤InTL/HOS≤0.95.

7 . The optical image capturing system of claim 1 , wherein the imaging lens assembly comprises seven lens elements with refractive powers, from an object side to an image side, the five lens elements are a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, and a seventh lens element, a distance on the optical axis from an object-side surface of the first lens element to the first image plane is denoted by HOS, a distance on the optical axis from the object-side surface of the first lens element to an image-side surface of the seventh lens element is denoted by InTL, and the following condition is satisfied: 0.1≤InTL/HOS≤0.95.

8 . The optical image capturing system of claim 1 , wherein modulation transfer rates of visible light at spatial frequency of 110 cycles/mm at positions of the optical axis, 0.3 HOI and 0.7 HOI on the first image plane are respectively denoted by MTFQ0, MTFQ3 and MTFQ7, and conditions as follows are satisfied: MTFQ0≥0.2, MTFQ3≥0.01, and MTFQ7≥0.01.

9 . 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.

10 . An optical image capturing system, comprising:
an imaging lens assembly, including at least three lens elements with refractive powers; a first image plane; a second image plane; and an image sensing device disposed between the first image plane and the second image plane;
wherein the first image plane 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 has a maximum value at central field of view of the first image plane; the second image plane 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 has a maximum value at central of field of view of the second image plane; a focal length of the imaging lens assembly is denoted by f, an entrance pupil diameter of the imaging lens assembly is HEP, 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 sum of thicknesses of the lens elements at a height of ½ HEP and parallel to the optical axis is denoted by SETP, a sum of central thicknesses of the lens elements on the optical axis is denoted by STP, and the imaging lens assembly comprises a first lens element that is closest to the object side; a horizontal distance paralleling the optical axis from a coordinate point on an object-side surface of the first lens element at height of ½ HEP to the first image plane is ETL, a horizontal distance paralleling the optical axis from a coordinate point on the object-side surface of the first lens element at height of ½ HEP to a coordinate point on an image-side surface of the lens element that is closest to the first image plane at height of ½ HEP is EIN; the following condition is satisfied: 1.0≤f/HEP≤10.0, 0 deg<HAF-150 deg, |FS|≤40 μm, 0.2≤SETP/STP <1, and 0.2≤EIN/ETL<1.

11 . The optical image capturing system of claim 10 , wherein modulation

Assignees

• Ability Opto Electronics Technology Co Ltd

Inventors

• Chang Yeong-Ming
• Lai Chien-Hsun
• Liao Kuo-Yu
• Liu yao-wei

Classifications

• G02B13/0045 Primary

  having five or more lenses · CPC title

• G02B7/02 Primary

  for lenses {(supports for magnifying lenses G02B25/002)} · CPC title

• G02B27/123 Primary

  The splitting element being a lens or a system of lenses, including arrays and surfaces with refractive power · CPC title

• G02B9/12

  having three components only · CPC title

• G02B13/0035

  having three lenses · CPC title