Optical photographing system, image capturing apparatus and electronic device

Patent metadata

Field	Value
Publication number	US-11982794-B2
Application number	US-202318172400-A
Country	US
Kind code	B2
Filing date	Feb 22, 2023
Priority date	Oct 5, 2016
Publication date	May 14, 2024
Grant date	May 14, 2024

Abstract

An optical photographing system includes, 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. The first lens element has an image-side surface being convex in a paraxial region thereof. The third lens element has positive refractive power. The fourth lens element has an object-side surface being concave in a paraxial region thereof. The fifth lens element with positive refractive power has two surfaces being both aspheric. The sixth lens element has an image-side surface being concave in a paraxial region thereof, wherein the surfaces of the sixth lens element are both aspheric, and the image-side surface of the sixth lens element includes at least one convex shape in an off-axial region thereof.

First claim

What is claimed is:

1. An optical photographing system 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 has an object-side surface towards the object side and an image-side surface towards the image side;
wherein the object-side surface of the first lens element is concave in a paraxial region thereof; the object-side surface of the first lens element comprises at least one convex shape in an off-axis region thereof; the image-side surface of the second lens element is concave in a paraxial region thereof;
wherein a total number of lens elements of the optical photographing system is six; an absolute value of a curvature radius of the object-side surface of the fifth lens element is larger than an absolute value of a curvature radius of the object-side surface of the first lens element;
wherein an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, a half of a maximum field of view of the optical photographing system is HFOV, 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, and the following conditions are satisfied:
0.20<( V 2+ V 4) V 3<1.0;
1.10≤tan(HFOV)<2.5; and

( CT 1+ CT 2+ CT 4)/( CT 3+ CT 5)≤0.72.

2. The optical photographing system of claim 1 , wherein the second lens element has positive refractive power; the image-side surface of the fifth lens element is convex in a paraxial region thereof; a focal length of the second lens element is f2, a focal length of the third lens element is f3, and the following condition is satisfied:
0.12≤| f 3/ f 2|<1.0.

3. The optical photographing system of claim 1 , wherein the object-side surface of the sixth lens element is convex in a paraxial region thereof, the image-side surface of the sixth lens element is concave in a paraxial region thereof; an axial distance between the third lens element and the fourth lens element is T34, an axial distance between the fourth lens element and the fifth lens element is T45, and the following condition is satisfied:
0< T 45/ T 34<2.0.

4. The optical photographing system of claim 1 , further comprising:
an aperture stop, wherein an axial distance between the aperture stop and the image-side surface of the sixth lens element is SD, 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:
0.70< SD/TD< 0.93.

5. The optical photographing system of claim 1 , wherein the first lens element has negative refractive power; a focal length of the optical photographing system is f, an entrance pupil diameter of the optical photographing system is EPD, and the following condition is satisfied:
1.0< f/EPD< 2.20.

6. The optical photographing system of claim 1 , wherein a displacement in parallel with an optical axis from an axial vertex on the object-side surface of the first lens element to a maximum effective radius position on the object-side surface of the first lens element is SAG11, a maximum effective radius of the object-side surface of the first lens element is Y11, and the following condition is satisfied:
| SAG 11/ Y 11|<0.20.

7. The optical photographing system of claim 1 , wherein a curvature radius of the image-side surface of the first lens element and a curvature radius of the image-side surface of the fourth lens element have the same sign.

8. The optical photographing system of claim 1 , wherein the absolute value of the curvature radius of the object-side surface of the fifth lens element is larger than an absolute value of a curvature radius of the image-side surface of the second lens element.

9. The optical photographing system of claim 1 , wherein a curvature radius of the object-side surface of the fourth lens element and a curvature radius of the image-side surface of the fourth lens element have the same sign.

10. The optical photographing system of claim 1 , wherein an axial distance between the first lens element and the second lens element is larger than an axial distance between the fifth lens element and the sixth lens element.

11. An image capturing apparatus, comprising:
the optical photographing system of claim 1 ; and
an image sensor disposed on an image surface of the optical photographing system.

12. An electronic device, comprising:
the image capturing apparatus of claim 11 .

13. An optical photographing system 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 has an object-side surface towards the object side and an image-side surface towards the image side;
wherein the object-side surface of the first lens element is concave in a paraxial region thereof; the object-side surface of the first lens element comprises at least one convex shape in an off-axis region thereof; the image-side surface of the second lens element is concave in a paraxial region thereof; the sixth lens element has negative refractive power;
wherein a total number of lens elements of the optical photographing system is six; a central thickness of the sixth lens element is larger than an axial distance between the second lens element and the third lens element; an absolute value of a curvature radius of the object-side surface of the third lens element is larger than an absolute value of a curvature radius of the image-side surface of the first lens element;
wherein an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, a half of a maximum field of view of the optical photographing system is HFOV, a curvature radius of the object-side surface of the fifth lens element is R9, a curvature radius of the image-side surface of the fifth lens element is R10, and the following conditions are satisfied:
0.20<( V 2+ V 4) N 3<1.0;
1.10≤tan(HFOV)<2.5; and

−5.0<( R 9+ R 10)/( R 9⊕ R 10)≤1.45.

14. The optical photographing system of claim 13 , wherein the image-side surface of the third lens element is convex in a paraxial region thereof; a focal length of the second lens element is f2, a focal length of the third lens element is f3, and the following condition is satisfied:
0.12 ≤|f 3/ f 2|<1.0.

15. The optical photographing system of claim 13 , wherein an axial distance between the third lens element and the fourth lens element is T34, an axial distance between the fourth lens element and the fifth lens element is T45, and the following condition is satisfied:
0< T 45/ T 34<2.0.

16. The optical photographing system of claim 13 , wherein a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, and the following condition is satisfied:
0.70<| f 5/ f 6|<1.0.

17. The optical photographing system of claim 13 , wherein the central thickness of the sixth lens element is larger than an axial distance between the first lens element and the second lens element

Assignees

• Largan Precision Co Ltd

Inventors

• Hsueh Chun-Che
• Tseng Yu-Tai
• Huang Hsin-Hsuan

Classifications

• G02B13/0045 Primary

  having five or more lenses · CPC title

• G02B9/62

  having six components only · CPC title

• G02B13/04

  Reversed telephoto objectives · CPC title

• G02B27/0025

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