Photographing optical lens assembly, image capturing unit and electronic device

Patent metadata

Field	Value
Publication number	US-9989741-B1
Application number	US-201715491629-A
Country	US
Kind code	B1
Filing date	Apr 19, 2017
Priority date	Feb 8, 2017
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

A photographing optical lens assembly includes five 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 and a fifth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has negative refractive power. The fourth lens element has an image-side surface being concave in a paraxial region thereof. The fifth lens element has an object-side surface and an image-side surface being both aspheric.

First claim

What is claimed is:

1. A photographing optical lens assembly comprising five lens elements, the five lens elements being, in order from an object side to an image side:
a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof;
a second lens element having negative refractive power;
a third lens element;
a fourth lens element having an image-side surface being concave in a paraxial region thereof; and
a fifth lens element having an object-side surface and an image-side surface being both aspheric;
wherein a central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, a central thickness of the third lens element is CT3, a central thickness of the fourth lens element is CT4, a central thickness of the fifth lens element is CT5, an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is Td, a sum of central thicknesses of the five lens elements of the photographing optical lens assembly is ΣCT, a focal length of the photographing optical lens assembly is f, a curvature radius of an object-side surface of the third lens element is R5, a curvature radius of an image-side surface of the third lens element is R6, and the following conditions are satisfied:
1.0<( CT 1+ CT 2)/( CT 3+ CT 4+ CT 5),
1.0< Td/ΣCT< 1.50; and
| f/R 5 |+|f/R 6|<1.85.

2. The photographing optical lens assembly of claim 1 , wherein an Abbe number of the third lens element is V3, and the following condition is satisfied:
V 3<45.

3. The photographing optical lens assembly of claim 1 , wherein an Abbe number of the fifth lens element is V5, and the following condition is satisfied:
V 5<45.

4. The photographing optical lens assembly of claim 1 , wherein the second lens element has an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof.

5. The photographing optical lens assembly of claim 1 , wherein the image-side surface of the fifth lens element is concave in a paraxial region thereof, and the image-side surface of the fifth lens element has at least one convex critical point.

6. The photographing optical lens assembly of claim 1 , wherein the central thickness of the first lens element is CT1, the central thickness of the second lens element is CT2, the central thickness of the third lens element is CT3, the central thickness of the fourth lens element is CT4, the central thickness of the fifth lens element is CT5, and the following condition is satisfied:
1.50<( CT 1+ CT 2)/( CT 3+ CT 4+ CT 5).

7. The photographing optical lens assembly of claim 1 , wherein 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 fifth lens element is Y52, and the following condition is satisfied:
0.80< Y 11/ Y 52<1.25.

8. The photographing optical lens assembly of claim 1 , wherein a sum of axial distances between each of the five adjacent lens elements of the photographing optical lens assembly is ΣAT, an axial distance between the fourth lens element and the fifth lens element is T45, and the following condition is satisfied:
1.0<Σ AT/T 45<2.0.

9. The photographing optical lens assembly of claim 1 , wherein an Abbe number of the fourth lens element is V4, and the following condition is satisfied:
V 4<30.

10. The photographing optical lens assembly of claim 1 , wherein the fourth lens element having an object-side surface being convex in a paraxial region thereof.

11. The photographing optical lens assembly of claim 1 , wherein the central thickness of the third lens element is CT3, the central thickness of the fourth lens element is CT4, and the following condition is satisfied:
1.50< CT 4/ CT 3.

12. The photographing optical lens assembly of claim 1 , wherein the axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is Td, the sum of central thicknesses of the five lens elements of the photographing optical lens assembly is ΣCT, and the following condition is satisfied:
1.0< Td/ΣCT< 1.30.

13. The photographing optical lens assembly of claim 1 , wherein a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, and the following conditions are satisfied:
| f 1|<| f 2|<| f 3|;
| f 1|<| f 2|<| f 4|;
| f 1|<| f 5|<| f 3|; and
| f 1|<| f 5|<| f 4|.

14. The photographing optical lens assembly of claim 1 , wherein the central thickness of the fourth lens element is CT4, the central thickness of the fifth lens element is CT5, and the following condition is satisfied:
0.75< CT 4/ CT 5<5.0.

15. The photographing optical lens assembly of claim 1 , wherein an axial distance between the image-side surface of the fifth lens element and an image surface is BL, a maximum image height of the photographing optical lens assembly is ImgH, and the following condition is satisfied:
0.80< BL/ImgH< 3.0.

16. The photographing optical lens assembly of claim 1 , further comprising a reflector disposed between an imaged object and the first lens element.

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

18. An electronic device, comprising:
the image capturing unit of claim 17 .

19. A photographing optical lens assembly comprising five lens elements, the five lens elements being, in order from an object side to an image side:
a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof;
a second lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof;
a third lens element;
a fourth lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof; and
a fifth lens element with negative refractive power having an object-side surface and an image-side surface being both aspheric;
wherein a central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, a central thickness of the third lens element is CT3, a central thickness of the fourth lens element is CT4, a central thickness of the fifth lens element is CT5, an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is Td, a sum of central thicknesses of the five lens elements of the photographing optical lens assembly is ΣCT, a focal length of the photographing optical lens assembly is f, a curvature radius of an object-side surface of the third lens element is R5, a curvature radius of an image-side surface of the third lens element is R6, and the following conditions are satisfied:
1.0<( CT 1+ CT 2)/( CT 3+ CT 4+ CT 5),
1.0< Td/ΣCT< 1.45; and
| f/R 5|+| f/R 6|<4.0.

20. The photographing optical lens assembly of claim 19 , wherein an Abbe number of the third lens element is V3, and the following condition is satisfied:
V 3<45.

Assignees

• Largan Precision Co Ltd

Inventors

• Hsueh Chun-Che
• Chen Wei-Yu
• Chen Hung-Shuo

Classifications

• 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

• G02B13/0065

  having a beam-folding prism or mirror · CPC title

• G02B13/0045 Primary

  having five or more lenses · CPC title

• G02B9/60

  having five components only · CPC title

• G02B27/0025

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