Imaging optical lens assembly, image capturing unit and electronic device

Patent metadata

Field	Value
Publication number	US-10698178-B2
Application number	US-201816132179-A
Country	US
Kind code	B2
Filing date	Sep 14, 2018
Priority date	Aug 10, 2018
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

An imaging optical lens assembly includes six lens elements which are, in order from an object side to an image side: 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. Each of the six lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. At least one of the six lens elements has at least one aspheric surface having at least one inflection point.

First claim

What is claimed is:

1. An imaging optical lens assembly comprising six lens elements, the six lens elements being, in order from an object side to an image side, 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; each of the six lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;
wherein at least one of the six lens elements has at least one aspheric surface having at least one inflection point, a focal length of the imaging optical lens assembly is f, an axial distance between the object-side surface of the first lens element and an image surface is TL, a curvature radius of the object-side surface of the first lens element is R1, an entrance pupil diameter of the imaging optical lens assembly is EPD, a maximum effective radius of the object-side surface of the first lens element is Y11, a maximum effective radius of the image-side surface of the sixth lens element is Y62, a minimum value among all Abbe numbers of the six lens elements of the imaging optical lens assembly is Vmin, an Abbe number of the fifth lens element is V5, an Abbe number of the sixth lens element is V6, and the following conditions are satisfied:
2.0<f/(f−TL);
−10.0<TL/R1<1.8;
1.0<TL/EPD<5.0;
0.55<Y11/Y62≤1.8;
10.0<Vmin<21.3;
20.0<V5+V6<105.0;
1.0 [mm]<TL<17.0 [mm] and 10.0<V5<45.0.

2. The imaging optical lens assembly of claim 1 , wherein the focal length of the imaging optical lens assembly is f, the axial distance between the object-side surface of the first lens element and the image surface is TL, a maximum value among all refractive indices of the six lens elements of the imaging optical lens assembly is Nmax, a chief ray angle at a maximum image height of the imaging optical lens assembly is CRA, and the following conditions are satisfied:
2.5<f/(f−TL)<100.0;
1.65<Nmax<1.75; and
CRA<25.0 [deg.].

3. The imaging optical lens assembly of claim 1 , wherein the axial distance between the object-side surface of the first lens element and the image surface is TL, the curvature radius of the object-side surface of the first lens element is R1, and the following condition is satisfied:
−5.0<TL/R1<1.4.

4. The imaging optical lens assembly of claim 1 , wherein the Abbe number of the fifth lens element is V5, the Abbe number of the sixth lens element is V6, and the following condition is satisfied:
25.0<V5+V6<90.0.

5. The imaging optical lens assembly of claim 1 , wherein the axial distance between the object-side surface of the first lens element and the image surface is TL, the entrance pupil diameter of the imaging optical lens assembly is EPD, and the following condition is satisfied:
1.2<TL/EPD<4.0.

6. The imaging optical lens assembly of claim 1 , wherein the axial distance between the object-side surface of the first lens element and the image surface is TL, a maximum image height of the imaging optical lens assembly is ImgH, a maximum value among maximum effective radii of all lens surfaces of the six lens elements of the imaging optical lens assembly is Ymax, a minimum value among maximum effective radii of all lens surfaces of the six lens elements of the imaging optical lens assembly is Ymin, and the following conditions are satisfied:
2.0 [mm]<TL<15.0 [mm];
1.5<TL/ImgH<7.0; and
1.0<Ymax/Ymin<2.0.

7. The imaging optical lens assembly of claim 1 , wherein the maximum effective radius of the object-side surface of the first lens element is Y11, the maximum effective radius of the image-side surface of the sixth lens element is Y62, and the following condition is satisfied:
0.65<Y11/Y62≤1.54.

8. The imaging optical lens assembly of claim 1 , wherein each of at least three of the six lens elements has at least one aspheric surface having at least one inflection point, half of a maximum field of view of the imaging optical lens assembly is HFOV, and the following condition is satisfied:
5.0 [deg.]<HFOV<32.0 [deg.].

9. The imaging optical lens assembly of claim 1 , wherein a maximum value among all axial distances between every adjacent lens element of the six lens elements is ATmax, an axial distance between the object-side surface of the first lens element and the image-side surface of the sixth lens element is TD, and the following condition is satisfied:
0<ATmax/TD<0.40.

10. The imaging optical lens assembly of claim 1 , wherein the focal length of the imaging optical lens assembly is f, a focal length of the first lens element is f1, and the following condition is satisfied:
−0.50<f/f1<1.0.

11. The imaging optical lens assembly of claim 1 , wherein the focal length of the imaging optical lens assembly is f, a minimum value among all absolute values of focal lengths of each of the six lens elements of the imaging optical lens assembly is |f|min, and the following condition is satisfied:
1.40<f/|f|min.

12. The imaging optical lens assembly of claim 1 , wherein the second lens element has positive refractive power, and the third lens element has negative refractive power.

13. An image capturing unit, comprising:
the imaging optical lens assembly of claim 1 ; and
an image sensor disposed on the image surface of the imaging optical lens assembly.

14. An electronic device, comprising:
the image capturing unit of claim 13 .

15. An imaging optical lens assembly comprising six lens elements, the six lens elements being, in order from an object side to an image side, 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; each of the six lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;
wherein at least one of the six lens elements has at least one aspheric surface having at least one inflection point, a focal length of the imaging optical lens assembly is f, an axial distance between the object-side surface of the first lens element and an image surface is TL, a curvature radius of the object-side surface of the first lens element is R1, an entrance pupil diameter of the imaging optical lens assembly is EPD, a maximum effective radius of the object-side surface of the first lens element is Y11, a maximum effective radius of the image-side surface of the sixth lens element is Y62, a sum of axial distances between every adjacent lens element of the six lens elements is ΣAT, a sum of central thicknesses of the six lens elements of the imaging optical lens assembly is ΣCT, an Abbe number of the fifth lens element is V5, a minimum value among all absolute values of focal lengths of each of the six lens elements of the imaging optical lens assembly is |f|min, half of a maximum field of view of the imaging optical lens assembly is HFOV, and the following conditions are satisfied:
2.0<f/(f−TL);
−10.0<TL/R1<1.8;
1.2<TL/EPD<4.0;
0.55<Y11/Y62≤1.8;
0<ΣAT/ΣCT<1.6;
10.0<V5<45.0;
1.40<f/|f|min; and
5.0 [deg.]<HFOV<32.0 [deg.].

16. The imaging optical lens assembly of claim 15 , wherein the focal length of the imaging optical lens assembly is f, the axial distance between the object-side surface of the first lens element and the image surface is TL, and the following conditions are satisfied:
2.5<f/(f−TL)<100.0; and
2.0 [mm]<TL<15.0 [mm].

17. The imaging optical lens assembly of claim 16 , wherein a maximum value among all axial distances between every adjacent lens element of the six lens elements is ATmax, an axial distance between the object-side

Assignees

• Largan Precision Co Ltd

Inventors

• Kuo Tzu-Chieh

Classifications

• G02B9/62 Primary

  having six components only · CPC title

• G02B13/0045 Primary

  having five or more lenses · 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

• G02B27/0025

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

• G02B13/02

  Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length · CPC title