Optical imaging lens

Patent metadata

Field	Value
Publication number	US-11409085-B2
Application number	US-201916664186-A
Country	US
Kind code	B2
Filing date	Oct 25, 2019
Priority date	Apr 15, 2019
Publication date	Aug 9, 2022
Grant date	Aug 9, 2022

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, shortened length, increased effective focal length and lowered f-number while the optical imaging lens may satisfy HFOV*Fno/EFL≤2.400, wherein a half field of view of the optical imaging lens is represented by HFOV, a f-number of the optical imaging lens is represented by Fno, and an effective focal length of the optical imaging lens is represented by EFL.

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 positive refracting power;
a periphery region of the object-side surface of the second lens element is convex;
an optical axis region of the image-side surface of the third lens element is convex;
a periphery region of the object-side surface of the fourth lens element is convex;
one of the object-side surface and the image-side surface of the fourth lens element is aspherical surface;
lens elements having refracting power of the optical imaging lens consist of the four lens elements described above;
a half field of view of the optical imaging lens is represented by HFOV;
a F-number of the optical imaging lens is represented by Fno;
an effective focal length of the optical imaging lens is represented by EFL; and
the optical imaging lens satisfies inequality: HFOV*Fno/EFL≤2.400°/mm.

2. The optical imaging lens according to claim 1 , wherein an Abbe number of the first lens element is represented by V1, an Abbe number of the second lens element is represented by V2, an Abbe number of the third lens element is represented by V3, an Abbe number of the fourth lens element is represented by V4, and the optical imaging lens further satisfies an inequality: V3+V4>V1+V2.

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 sum of the thicknesses of the first lens element, the second lens element, the third lens element and the fourth lens element along the optical axis, is represented by ALT, and the optical imaging lens further satisfies an inequality: TTL/ALT≤3.500.

4. 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 thickness of the first lens element along the optical axis is represented by T1, an air gap between the first lens element and the second lens element along the optical axis is represented by G12, a thickness of the second lens element along the optical axis is represented by T2, and the optical imaging lens further satisfies an inequality: TL/(T1+G12+T2)≤3.400.

5. The optical imaging lens according to claim 1 , wherein a sum of the three air gaps between the first lens element and the fourth lens element along the optical axis is represented by AAG, a thickness of the third lens element along the optical axis is represented by T3, and the optical imaging lens further satisfies an inequality: AAG/T3≤6.000.

6. The optical imaging lens according to claim 1 , wherein a thickness of the first lens element along the optical axis is represented by T1, an air gap between the second lens element and the third lens element along the optical axis is represented by G23, an air gap between the third lens element and the fourth lens element along the optical axis is represented by G34, a thickness of the fourth lens element along the optical axis is represented by T4, and the optical imaging lens further satisfies an inequality: (T1+G23+G34)/T4≤4.000.

7. The optical imaging lens according to claim 1 , wherein an image height of the optical imaging lens is represented by ImgH, and the optical imaging lens further satisfies an inequality: EFL/ImgH≤5.000.

8. 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 positive refracting power;
a periphery region of the object-side surface of the second lens element is convex;
a periphery region of the object-side surface of the third lens element is concave, and a periphery region of the image-side surface of the third lens element is convex;
an optical axis region of the image-side surface of the fourth lens element is concave;
one of the object-side surface and the image-side surface of the fourth lens element is aspherical surface;
lens elements having refracting power of the optical imaging lens consist of the four lens elements described above;
a half field of view of the optical imaging lens is represented by HFOV;
a F-number of the optical imaging lens is represented by Fno;
an effective focal length of the optical imaging lens is represented by EFL; and
the optical imaging lens satisfies inequality: HFOV*Fno/EFL≤2.400°/mm.

9. The optical imaging lens according to claim 8 , wherein an Abbe number of the first lens element is represented by V1, an Abbe number of the second lens element is represented by V2, an Abbe number of the third lens element is represented by V3, an Abbe number of the fourth lens element is represented by V4, and the optical imaging lens further satisfies an inequality: V1+V4>V2+V3.

10. The optical imaging lens according to claim 8 , 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 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: TL/BFL≤3.200.

11. The optical imaging lens according to claim 8 , 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 thickness of the first lens element along the optical axis is represented by T1, an air gap between the third lens element and the fourth lens element along the optical axis is represented by G34, a thickness of the fourth lens element along the optical axis is represented by T4, and the optical imaging lens further satisfies an inequality: TTL/(T1+G34+T4)≤5.100.

12. The optical imaging lens according to claim 8 , wherein a sum of the three air gaps between the first lens element and the fourth lens element along the optical axis is represented by AAG, a thickness of the second lens element along the optical axis is represented by T2, and the optical imaging lens further satisfies an inequality: AAG/T2≤3.800.

13. The optical imaging lens according to claim 8 , wherein a thickness of the first lens element along the optical axis is represented by T1, an air gap between the first lens element and the second lens element along the optical axis is represented by G12, an air gap between the third lens element and the fourth lens element along the optical axis is represented by G34, a thickness of the third lens element along the optical axis is represented by T3, and the optical imaging lens further satisfies an inequality: (T1+G12+G34)/T3≤3.300.

14. The optical imaging lens according to claim 8 , wherein a distance from the object-side surface of the first lens element to the image-side surface of the fourth lens e

Assignees

• Genius Electronic Optical Xiamen Co Ltd

Inventors

• Hsieh Hung-Chien
• Zhang Lanlan
• Zhou Ou

Classifications

• G02B27/0025

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

• G02B13/002

  having at least one aspherical surface · CPC title

• G02B9/36

  arranged + -- + · CPC title

• G02B5/005

  Diaphragms (for cameras G03B9/02) · CPC title

• G02B13/18 Primary

  with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)} · CPC title