Optical image capturing system and electronic device

Patent metadata

Field	Value
Publication number	US-2018307000-A1
Application number	US-201715671765-A
Country	US
Kind code	A1
Filing date	Aug 8, 2017
Priority date	Apr 21, 2017
Publication date	Oct 25, 2018
Grant date	—

Abstract

An optical image capturing system and an electronic using the same are disclosed. The optical image capturing system includes at least two lenses, an image plane, and a first position element. In certain condition, the design of the optical image capturing system may simantaneously inhibit the deviation of effect focal length and improve the imagining quality in response to temperature fluctuation.

First claim

What is claimed is:

1 . An optical image capturing system, comprising:
an optical imaging lens assembly comprising at least two lenses having refractive power; and an image plane; wherein each lens of the at least two lenses has an object-side surface, which faces an object side, and an image-side surface, which faces an image side; wherein at least one among the at least two lenses has positive refractive power, and the optical image capturing system satisfies: 1.0≤FST/HEP≤10.0; 0 deg<HAF≤150 deg; WT1≤100° C.; and BHOS1/BHOS≥0.9, wherein FST is a standard effective focal length of the optical imaging lens assembly at a standard temperature ST, HEP is an entrance pupil diameter of the optical imaging lens assembly, HAF is a half of the maximum field angle of the optical imaging lens assembly; wherein under the standard temperature ST, HOS is a distance on the optical axis between the object-side surface of the lens, which is nearest to the object side, and the image plane, BHOS is a distance on the optical axis between the image-side surface of the lens, which is nearest to the image plane, and the image plane; wherein under a first working temperature WT1, BHOS1 is a distance on the optical axis between the image-side surface of the lens, which is nearest to the image plane, and the image plane.

2 . The optical image capturing system according to claim 1 , wherein the first working temperature WT1 satisfies: −50° C.<WT1≤100° C.

3 . The optical image capturing system according to claim 1 , wherein the first working temperature WT1 satisfies: −40° C.<WT1≤70° C.

4 . The optical image capturing system according to claim 1 , wherein at least one among the at least two lenses of the optical imaging lens assembly is made of material which has a first thermal refractive index coefficient DNT1 at the first working temperature WT1 and a reference wavelength of d-line, and the optical image capturing system satisfies: −200 (10 −6 /° C.)≤DNT1<0(10 −6 /° C.).

5 . The optical image capturing system according to claim 1 , wherein at least one among the at least two lenses of the optical imaging lens assembly is made of material which has a second thermal refractive index coefficient DNT2 at a second working temperature WT2 and a reference wavelength of d-line, the second working temperature WT2 is lower than the first working temperature WT1, and the optical image capturing system satisfies: ST<WT2<WT1; and −200 (10 −6 /° C.)≤DNT2<−1(10 −6 /° C.).

6 . The optical image capturing system according to claim 5 , wherein the second working temperature WT2 satisfies: −40° C.<WT2≤50° C.

7 . The optical image capturing system according to claim 1 , wherein the optical image capturing system further satisfies: MTFE≥00.1; MTFE3≥0.01; and MTFE7≥0.01, wherein MTFE0, MTFE3, and MTFE7 are respectively a value of modulation transfer function of visible light in a spatial frequency of 55 cycles/mm at the optical axis, 0.3 HOI, and 0.7 HOI on an image plane.

8 . The optical image capturing system according to claim 1 , wherein the optical image capturing system further satisfies: 0.9≤2(ARE/HEP)≤2.0, wherein ARE is a length of outline curve from an axial point on any surface of any one of the at least two lenses to a coordinate point of perpendicular height with a distance of a half of the entrance pupil diameter from the optical axis on the surface along an outline of the surface.

9 . The optical image capturing system according to claim 1 , wherein the optical image capturing system further satisfies: 0.9≤ARS/EHD≤2.0, wherein EHD is the maximum effective half diameter of any surface of any one of the at least two lenses, and ARS is a length of outline curve from an axial point on any surface of any one of the at least two lenses to a coordinate point of perpendicular height with a distance of a half of the entrance pupil diameter from the optical axis on the surface along an outline of the surface of any surface of any one of the at least two lenses.

10 . The optical image capturing system according to claim 1 , wherein the optical image capturing system satisfies: 1<FWT1/FST≤5, wherein FWT1 is a first effective focal length of the optical imaging lens assembly at the first working temperature WT1.

11 . The optical image capturing system according to claim 1 , wherein the optical image capturing system satisfies: |BHOS1−BHOS|>0.001 mm, wherein under the standard temperature ST, HOS is a distance on the optical axis between the object-side surface of the lens, which is nearest to the object side, and the image plane, BHOS is a distance on the optical axis between the image-side surface of the lens, which is nearest to the image plane, and the image plane; and
wherein under a first working temperature WT1, BHOS1 is a distance on the optical axis between the image-side surface of the lens, which is nearest to the image plane, and the image plane.

12 . The optical image capturing system according to claim 1 , wherein the optical image capturing system satisfies: 0<|BHOS1−BHOS|/BHOS2, wherein under the standard temperature ST, HOS is a distance on the optical axis between the object-side surface of the lens, which is nearest to the object side, and the image plane, and BHOS is a distance on the optical axis between the image-side surface of the lens, which is nearest to the image plane, and the image plane; and
wherein under a first working temperature WT1, BHOS1 is a distance on the optical axis between the image-side surface of the lens, which is nearest to the image plane, and the image plane.

13 . An optical image capturing system, comprising:
an optical imaging lens assembly comprising at least two lenses having refractive power; and an image plane, wherein each lens of the at least two lenses has an object-side surface, which faces an object side, and an image-side surface, which faces an image side; a first positioning element comprising a holder and a base, and wherein the holder is in a hollow shape and non-transparent, and configured to connect the optical imaging lens assembly, and the base is disposed near the image plane and configured to shield the image plane; wherein at least one among the at least two lenses has positive refractive power, and the optical image capturing system satisfies: 1.0≤FST/HEP≤10.0; 0 deg<HAF≤150 deg; 1 mm≤LPE1≤1000 mm; 1.1(10 −6 /° C.)≤CES1≤120(10 −6 /° C.); and DNT1<0 (10 −6 /T), wherein FST is a standard effective focal length of the optical imaging lens assembly at a standard temperature ST, HEP is an entrance pupil diameter of the optical imaging lens assembly, HAF is a half of the maximum field angle of the optical imaging lens assembly; wherein at least one among the at least two lenses of the optical imaging lens assembly is made of material which has a first thermal refractive index coefficient DNT1 at a first working temperature WT1 and a reference wavelength of d-line, and LPE1 is a length of an outer wall of the first positioning element in parallel with the optical axis at the standard temperature ST, and CES1 is a thermal expansion coefficient of the first positioning element at the standard temperature ST.

14 . The optical image capturing system according to claim 13 , wherein the first working temperature WT1 satisfies: −50° C.<WT1≤100° C.

15 . The optical image capturing system according to claim 13 , wherein the first working temperature WT1 satisfies: −40° C.<WT1≤70° C.

16 . The optical image capturing system according to claim 13 , wherein at least one among the at least two lenses of the optical imaging lens assembly is made of material whi

Assignees

• Ability Opto Electronics Technology Co Ltd

Inventors

• Lai Chien-Hsun
• Chang Yeong-Ming
• Tsai Chen-Hung
• Chen Ying-Jung
• Liu yao-wei
• Yang Hui-Hsuan

Classifications

• G02B7/021

  for more than one lens · CPC title

• G02B13/0045

  having five or more lenses · CPC title

• G02B13/002

  having at least one aspherical surface · CPC title

• G02B7/028 Primary

  with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation · CPC title

• G02B9/04

  having two components only · CPC title