Optical photographing lens assembly, image capturing unit and electronic device

Patent metadata

Field	Value
Publication number	US-11977274-B2
Application number	US-202217979701-A
Country	US
Kind code	B2
Filing date	Nov 2, 2022
Priority date	Feb 1, 2019
Publication date	May 7, 2024
Grant date	May 7, 2024

Abstract

An optical photographing lens assembly includes seven 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, a sixth lens element and a seventh lens element. Each of the seven lens elements of the optical photographing lens assembly has an object-side surface facing toward the object side and an image-side surface facing toward the image side. 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 is aspheric and has at least one critical point in an off-axis region thereof.

First claim

What is claimed is:

1. An optical photographing lens assembly comprising seven lens elements, the seven 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, a sixth lens element and a seventh lens element; each of the seven lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;
wherein the first lens element has negative refractive power, 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 is aspheric and has at least one critical point in an off-axis region thereof, the object-side surface of the third lens element is convex in a paraxial region thereof, and the fourth lens element has negative refractive power;
wherein a sum of axial distances between each of all adjacent lens elements of the optical photographing lens assembly is ΣAT, an axial distance between the second lens element and the third lens element is T23, a curvature radius of the object-side surface of the third lens element is R5, a curvature radius of the image-side surface of the third lens element is R6, a focal length of the optical photographing lens assembly is f, a focal length of the first lens element is f1, and the following conditions are satisfied:
2.20<Σ AT/T 23<12.5;

−0.25<( R 5+ R 6)/( R 5− R 6)<3.5; and

−0.50< f/f 1<0.40.

2. The optical photographing lens assembly of claim 1 , wherein an f-number of the optical photographing lens assembly is Fno, half of a maximum field of view of the optical photographing lens assembly is HFOV, an axial distance between the object-side surface of the first lens element and an image surface is TL, and the following conditions are satisfied:
1.20< Fno< 2.40;
40.0 degrees<HFOV<70.0 degrees; and
2.5 mm< TL< 8.5 mm.

3. The optical photographing lens assembly of claim 1 , wherein the second lens element has positive refractive power, and each of at least two lens elements of the optical photographing lens assembly has at least one aspheric surface having at least one critical point in an off-axis region thereof.

4. The optical photographing lens assembly of claim 1 , wherein the third lens element has positive refractive power, and the image-side surface of the third lens element is convex in a paraxial region thereof.

5. The optical photographing lens assembly of claim 1 , wherein the seventh lens element has negative refractive power;
wherein the focal length of the optical photographing lens assembly is f, a focal length of the seventh lens element is f7, and the following condition is satisfied:
−3.0< f/f 7<−0.50.

6. The optical photographing lens assembly of claim 1 , wherein the object-side surface of the seventh lens element is convex in a paraxial region thereof, the object-side surface of the seventh lens element is aspheric and has at least one critical point in an off-axis region thereof, and the image-side surface of the seventh lens element is concave in a paraxial region thereof.

7. The optical photographing lens assembly of claim 1 , further comprising an aperture stop disposed between the first lens element and the third lens element;
wherein an axial distance between the aperture stop and an image surface is SL, an axial distance between the object-side surface of the first lens element and the image surface is TL, and the following condition is satisfied:
0.70< SL/TL< 1.1.

8. An optical photographing lens assembly comprising seven lens elements, the seven 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, a sixth lens element and a seventh lens element; each of the seven lens elements having an object-side surface facing toward the object side and an image-side surface facing toward 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 is aspheric and has at least one critical point in an off-axis region thereof, the second lens element has positive refractive power, the third lens element has positive refractive power, the object-side surface of the third lens element is convex in a paraxial region thereof, the image-side surface of the fourth lens element is concave in a paraxial region thereof, and the object-side surface of the fifth lens element is concave in a paraxial region thereof;
wherein a sum of axial distances between each of all adjacent lens elements of the optical photographing lens assembly is ΣAT, an axial distance between the second lens element and the third lens element is T23, an axial distance between the fifth lens element and the sixth lens element is T56, a central thickness of the fifth lens element is CT5, and the following conditions are satisfied:
1.20<Σ AT/T 23<90.0; and

1.80< CT 5/ T 56.

9. The optical photographing lens assembly of claim 8 , wherein the sum of axial distances between each of all adjacent lens elements of the optical photographing lens assembly is ΣAT, the axial distance between the second lens element and the third lens element is T23, and the following condition is satisfied:
1.60<Σ AT/T 23<40.0.

10. The optical photographing lens assembly of claim 8 , wherein a focal length of the optical photographing lens assembly is f, a focal length of the second lens element is f2, and the following condition is satisfied:
0.15< f/f 2<0.80.

11. The optical photographing lens assembly of claim 8 , wherein 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:
0.30< f 2/ f 3<5.0.

12. The optical photographing lens assembly of claim 8 , wherein the image-side surface of the fifth lens element is convex in a paraxial region thereof, the image-side surface of the seventh lens element is concave in a paraxial region thereof, and the image-side surface of the seventh lens element is aspheric and has at least one critical point in an off-axis region thereof;
wherein a vertical distance between the critical point on the image-side surface of the seventh lens element and an optical axis is Yc72, a maximum effective radius of the image-side surface of the seventh lens element is Y72, and the following condition is satisfied:
0.35< Yc 72/ Y 72<0.70.

13. The optical photographing lens assembly of claim 8 , wherein each of at least three lens elements of the optical photographing lens assembly has at least one aspheric surface having at least one inflection point;
wherein a focal length of the optical photographing lens assembly is f, a focal length of the fourth lens element is f4, and the following condition is satisfied:
−1.0< f/f 4<0.60.

14. An optical photographing lens assembly comprising seven lens elements, the seven 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, a sixth lens element and a seventh lens element; each of the seven lens elements having an object-side surface facing toward the object side and an image-side surface facing toward 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 is aspheric and has at least one critical point in an off-axis region the

Assignees

• Largan Precision Co Ltd

Inventors

• Lin Cheng-Chen
• Tseng Yu-Tai
• Kuo Tzu-Chieh

Classifications

• G02B9/64 Primary

  having more than six components · CPC title

• G02B13/0045

  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