Imaging optical lens assembly, imaging apparatus and electronic device

Patent metadata

Field	Value
Publication number	US-11442256-B2
Application number	US-201916522900-A
Country	US
Kind code	B2
Filing date	Jul 26, 2019
Priority date	Nov 14, 2018
Publication date	Sep 13, 2022
Grant date	Sep 13, 2022

Abstract

An imaging optical lens assembly includes an aperture stop and a plurality of lens elements. The aperture stop has a fixed elliptical shape, and the aperture stop has a major axis and a minor axis.

First claim

What is claimed is:

1. An imaging optical lens assembly, comprising:
an aperture stop having a fixed elliptical shape, with a major axis and a minor axis;
a plurality of lens elements, wherein a number of the lens elements is at least three and at most seven; and
a lens barrel, wherein an outer diameter of the lens barrel comprises at least two cut sides;
wherein a major axis diameter of the aperture stop is ESDX, a minor axis diameter of the aperture stop is ESDY, a focal length of the imaging optical lens assembly is f, one of the lens elements closest to an object side is a first lens element, an axial distance between an object-side surface of the first lens element and an image surface is TL, and the following conditions are satisfied:
1.08<ESDX/ESDY; and
TL/f<1.20.

2. The imaging optical lens assembly of claim 1 , wherein a maximum among refractive indices of the lens elements of the imaging optical lens assembly is Nmax, a minimum among Abbe numbers of the lens elements of the imaging optical lens assembly is Vmin, and the following conditions are satisfied:
Nmax<1.70; and
Vmin<22.

3. The imaging optical lens assembly of claim 1 , wherein the major axis diameter of the aperture stop is ESDX, the minor axis diameter of the aperture stop is ESDY, and the following condition is satisfied:
1.10<ESDX/ESDY<1.50.

4. 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, and the following condition is satisfied:
0.50<TL/f<1.0.

5. The imaging optical lens assembly of claim 1 , wherein there are five or more lens elements and at least three of the lens elements are made of plastic material.

6. The imaging optical lens assembly of claim 1 , wherein the first lens element has positive refractive power, and a maximum optical effective diameter of the first lens element is a maximum among maximum optical effective diameters of the lens elements of the imaging optical lens assembly.

7. The imaging optical lens assembly of claim 1 , wherein the minimum among Abbe numbers of the lens elements of the imaging optical lens assembly is Vmin, and the following condition is satisfied:
Vmin<20.

8. The imaging optical lens assembly of claim 1 , wherein a central thickness of the first lens element is a maximum among central thicknesses of the lens elements of the imaging optical lens assembly.

9. The imaging optical lens assembly of claim 1 , wherein a central thickness of the first lens element is CT1, a sum of central thicknesses of the lens elements of the imaging optical lens assembly is ΣCT, and the following condition is satisfied:
0.55<CT1/(ΣCT-CT1).

10. The imaging optical lens assembly of claim 9 , wherein the central thickness of the first lens element is CT1, the sum of central thicknesses of the lens elements of the imaging optical lens assembly is ΣCT, and the following condition is satisfied:
0.65<CT1/(ΣCT-CT1).

11. The imaging optical lens assembly of claim 1 , wherein the aperture stop is located on an object side of the first lens element.

12. The imaging optical lens assembly of claim 1 , wherein a curvature radius of the object-side surface of the first lens element is R1, the focal length of the imaging optical lens assembly is f, and the following condition is satisfied:
3.50<f/R1.

13. The imaging optical lens assembly of claim 1 , wherein each of at least half of the lens elements has at least one surface being aspheric, and at least one of the lens elements comprises at least one inflection point.

14. The imaging optical lens assembly of claim 1 , wherein a maximum among optical effective radii of the lens elements is Ymax, and the following condition is satisfied:
Ymax<3.0 mm.

15. The imaging optical lens assembly of claim 1 , wherein the focal length of the imaging optical lens assembly is f, a maximum field of view of the imaging optical lens assembly is FOV, and the following conditions are satisfied:
8 mm<f<18 mm; and
tan(FOV)<0.80.

16. The imaging optical lens assembly of claim 1 , wherein the focal length of the imaging optical lens assembly is f, a diameter of a circle with an area of the same size as an elliptical entrance pupil of the imaging optical lens assembly is EPDC, and the following condition is satisfied:
f/EPDC<3.5.

17. The imaging optical lens assembly of claim 1 , wherein an outer diameter of at least one of the lens elements comprises at least two cut sides.

18. The imaging optical lens assembly of claim 17 , wherein a double shortest distance from a center to the outer diameter of the at least one of the lens elements is LRmin, a double longest distance from the center to the outer diameter of the at least one of the lens elements is LRmax, and the following condition is satisfied:
LRmin/LRmax<0.90.

19. The imaging optical lens assembly of claim 1 , wherein a double shortest distance from a center to the outer diameter of the lens barrel is BRmin, a double longest distance from the center to the outer diameter of the lens barrel is BRmax, and the following condition is satisfied:
BRmin/BRmax<0.95.

20. The imaging optical lens assembly of claim 1 , further comprising:
a light blocking element, an opening of the light blocking element is a non-circular opening.

21. The imaging optical lens assembly of claim 1 , further comprising:
at least one reflective element.

22. The imaging optical lens assembly of claim 21 , wherein the reflective element is located on an object side of the first lens element.

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

24. An electronic device, comprising:
the imaging apparatus of claim 23 .

25. The electronic device of claim 24 , wherein the electronic device comprises at least two photographing apparatuses facing towards the same object side of the imaging apparatus in the electronic device.

Assignees

• Largan Precision Co Ltd

Inventors

• Chen Wei-Yu
• Tang Hsiang-Chi

Classifications

• G02B13/0065

  having a beam-folding prism or mirror · CPC title

• G02B13/001

  Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras (G02B23/243 takes precedence) · CPC title

• G03B9/06

  Two or more co-operating pivoted blades, e.g. iris type (shutters functioning as diaphragms by limiting extent of opening movement G03B9/08) · 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

• G02B5/005

  Diaphragms (for cameras G03B9/02) · CPC title