Optical imaging lens comprising four lens of −+−+ refractive powers

Patent metadata

Field	Value
Publication number	US-11061204-B2
Application number	US-201916435849-A
Country	US
Kind code	B2
Filing date	Jun 10, 2019
Priority date	Mar 12, 2019
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

An optical imaging lens may include a first, a second, a third and a fourth lens elements positioned in an order from an object side to an image side. Through designing concave and/or convex surfaces of the four lens elements, the optical imaging lens may provide improved imaging quality and optical characteristics and increased field of view while the optical imaging lens may satisfy (T 1 +AAG)/T 4 ≤1.700, wherein a thickness of the first lens element along the optical axis is represented by T 1 , a thickness of the fourth lens element along the optical axis is represented by T 4 , and a sum of the three air gaps from the first lens element to the fourth lens element along the optical axis is represented by AAG.

First claim

What is claimed is:

1. An optical imaging lens comprising a first lens element, a second lens element, a third lens element, and a fourth lens element sequentially from an object side to an image side along an optical axis, each of the first, second, third, and fourth lens elements having an object-side surface facing toward the object side and allowing imaging rays to pass through as well as an image-side surface facing toward the image side and allowing the imaging rays to pass through, wherein:
the first lens element has negative refracting power;
a periphery region of the object-side surface of the first lens element is convex;
an optical axis region of the object-side surface of the second lens element is convex;
an optical axis region of the image-side surface of the second lens element is convex;
an optical axis region of the image-side surface of the third lens element is concave;
a periphery region of the object-side surface of the fourth lens element is convex;
the optical imaging lens comprises no other lens elements having refracting power beyond the first, second, third, and fourth lens elements;
a thickness of the first lens element along the optical axis is represented by T 1 ;
a thickness of the fourth lens element along the optical axis is represented by T 4 ;
a sum of the three air gaps from the first lens element to the fourth lens element along the optical axis is represented by AAG;
an air gap from the first lens element to the second lens element along the optical axis is represented by G 12 ;
an air gap from the second lens element to the third lens element along the optical axis is represented by G 23 ;
a F-number of the optical imaging lens is represented by Fno;
and
the optical imaging lens satisfies inequalities: (T 1 +AAG)/T 4 ≤1.700, and (G 12 +G 23 )*Fno/T 4 ≤2.900.

2. The optical imaging lens according to claim 1 , wherein an Abbe number of the first lens element is represented by V 1 , an Abbe number of the third lens element is represented by V 3 , and the optical imaging lens further satisfies an inequality: 1.500≤V 1 /V 3 .

3. The optical imaging lens according to claim 1 , wherein a distance from the object-side surface of the first lens element to an image plane along the optical axis is represented by TTL, a distance from the image-side surface of the fourth lens element to the image plane along the optical axis is represented by BFL, and the optical imaging lens further satisfies an inequality: TTL/BFL≤4.800.

4. The optical imaging lens according to claim 1 , wherein a distance from the image-side surface of the fourth lens element to an image plane along the optical axis is represented by BFL, a thickness of the second lens element along the optical axis is represented by T 2 , and the optical imaging lens further satisfies an inequality: (G 12 +G 23 +BFL)/T 2 ≤3.100.

5. The optical imaging lens according to claim 1 , wherein a thickness of the second lens element along the optical axis is represented by T 2 , a sum of the thicknesses of four lens elements from the first lens element to the fourth lens element along the optical axis is represented by ALT, and the optical imaging lens further satisfies an inequality: ALT/T 2 ≤3.800.

6. The optical imaging lens according to claim 1 , wherein a distance from the image-side surface of the fourth lens element to an image plane along the optical axis is represented by BFL, and the optical imaging lens further satisfies an inequality: (G 12 +G 23 +BFL)/T 4 ≤3.000.

7. The optical imaging lens according to claim 1 , wherein a thickness of the third lens element along the optical axis is represented by T 3 , and the optical imaging lens further satisfies an inequality: (T 1 +G 12 +G 23 +T 3 )/T 4 ≤2.200.

8. The optical imaging lens according to claim 1 , wherein
a periphery region of the image-side surface of the second lens element is convex.

9. The optical imaging lens according to claim 1 , wherein an Abbe number of the second lens element is represented by V 2 , an Abbe number of the third lens element is represented by V 3 , and the optical imaging lens further satisfies an inequality: 1.500≤V 2 /V 3 .

10. The optical imaging lens according to claim 1 , wherein a distance from the object-side surface of the first lens element to an image plane along the optical axis is represented by TTL a sum of the thicknesses of four lens elements from the first lens element to the fourth lens element along the optical axis is represented by ALT, and the optical imaging lens further satisfies an inequality: TTL/ALT≤2.200.

11. The optical imaging lens according to claim 1 , wherein a thickness of the second lens element along the optical axis is represented by T 2 , a thickness of the third lens element along the optical axis is represented by T 3 , a distance from the image-side surface of the fourth lens element to an image plane along the optical axis is represented by BFL, and the optical imaging lens further satisfies an inequality: (G 23 +T 3 +BFL)/T 2 ≤3.300.

12. The optical imaging lens according to claim 1 , wherein a thickness of the second lens element along the optical axis is represented by T 2 , a sum of the thicknesses of four lens elements from the first lens element to the fourth lens element along the optical axis is represented by ALT, and the optical imaging lens further satisfies an inequality: ALT/(T 2 +G 23 )≤2.800.

13. The optical imaging lens according to claim 1 , wherein
an effective focal length of the optical imaging lens is represented by EFL;
an image height of the optical imaging lens is represented by ImgH;
and
the optical imaging lens satisfies inequality:
0.900≤ImgH/EFL.

14. The optical imaging lens according to claim 1 , wherein an Abbe number of the third lens element is represented by V 3 , an Abbe number of the fourth lens element is represented by V 4 , and the optical imaging lens further satisfies an inequality: 1.500≤V 4 /V 3 .

15. The optical imaging lens according to claim 1 , wherein a distance from the object-side surface of the first lens element to the image-side surface of the fourth lens element along the optical axis is represented by TL, a sum of the thicknesses of four lens elements from the first lens element to the fourth lens element along the optical axis is represented by ALT, and the optical imaging lens further satisfies an inequality: TL/ALT≤1.800.

16. The optical imaging lens according to claim 1 , wherein a thickness of the second lens element along the optical axis is represented by T 2 , a distance from the image-side surface of the fourth lens element to an image plane along the optical axis is represented by BFL, and the optical imaging lens further satisfies an inequality: (G 12 +BFL)/T 2 ≤3.000.

17. The optical imaging lens according to claim 1 , wherein a thickness of the second lens element along the optical axis is represented by T 2 , an air gap from the third lens element to the fourth lens element along the optical axis is represented by G 34 , a sum of the thicknesses of four lens elements from the first lens element to the fourth lens element along the optical axis is represented by ALT, and the optical imaging lens further satisfies an inequality: ALT/(T 2 +G 34 )≤3.000.

18. The optical imaging lens according to claim 1 , wherein a a thickness of the third lens element along the optical axis is represented by T 3 , and the optical imaging lens further satisfies an inequality: (G 12 +T 3 )*Fno/(T 1 +T 4 )≤2.000.

19. The optical imaging lens according to claim 1 , wherein a

Assignees

• Genius Electronic Optical Xiamen Co Ltd

Inventors

• Jhang Jia-Sin
• Chen Baina
• Li Feng

Classifications

• G02B13/004 Primary

  having four lenses · CPC title

• G02B13/04

  Reversed telephoto objectives · CPC title

• G02B3/04

  with continuous faces that are rotationally symmetrical but deviate from a true sphere {, e.g. so called "aspheric" lenses} · CPC title

• G02B9/34

  having four components only · CPC title

• G02B13/06

  Panoramic objectives; So-called "sky lenses" {including panoramic objectives having reflecting surfaces} · CPC title