Optical imaging lens including seven lenses of −−++−+−, −+++−+− or −−++−++ refractive powers

Patent metadata

Field	Value
Publication number	US-11874439-B2
Application number	US-202017037725-A
Country	US
Kind code	B2
Filing date	Sep 30, 2020
Priority date	Dec 10, 2019
Publication date	Jan 16, 2024
Grant date	Jan 16, 2024

Abstract

The disclosure discloses an optical imaging lens. The optical imaging lens sequentially includes from an object side to an image side along an optical axis: a first lens having a negative focal power, and provided with an object-side surface, the object-side surface is concave surface; a second lens having a focal power; a third lens having a focal power; a fourth lens having a positive focal power; a fifth lens having a negative focal power, and provided with an image-side surface, the image-side surface is concave surface; a sixth lens having a positive focal power; and a seventh lens having a focal power; at least one aspherical mirror surface is included in the object-side surface of the first lens to an image-side surface of the seventh lens; and a maximum Field of View (FOV) of the optical imaging lens meets 105°≤FOV≤135°.

First claim

What is claimed is:

1. An optical imaging lens, sequentially comprising from an object side to an image side along an optical axis:
a first lens having a negative focal power, and provided with an object-side surface, the object-side surface is concave surface;
a second lens having a focal power;
a third lens having a focal power;
a fourth lens having a positive focal power;
a fifth lens having a negative focal power, and provided with an image-side surface, the image-side surface is concave surface;
a sixth lens having a positive focal power; and
a seventh lens having a focal power,
wherein the object-side surface of the first lens to an image-side surface of the seventh lens comprise at least one aspherical surface; and
a maximum Field of View (FOV) of the optical imaging lens meets 105°≤FOV≤135°;
a central thickness CT1 of the first lens on the optical axis, a central thickness CT2 of the second lens on the optical axis, and a central thickness CT3 of the third lens on the optical axis meet 0.6<CT1/(CT2+CT3)<1.1.

2. The optical imaging lens as claimed in claim 1 , wherein an effective focal length f1 of the first lens, an effective focal length f5 of the fifth lens, a curvature radius R1 of the object-side surface of the first lens and a curvature radius R5 of an object-side surface of the third lens meet 1.0<(f1+f5)/(R1−R5)<1.4.

3. The optical imaging lens as claimed in claim 1 , wherein an effective focal length f4 of the fourth lens, an effective focal length f6 of the sixth lens, and a total effective focal length f of the optical imaging lens meet 2.5<(f4+f6)/f<3.2.

4. The optical imaging lens as claimed in claim 1 , wherein an effective focal length f3 of the third lens, a curvature radius R5 of an object-side surface of the third lens and a curvature radius R6 of an image-side surface of the third lens meet 1.3<f3/(R5+R6)<2.3.

5. The optical imaging lens as claimed in claim 1 , wherein a curvature radius R11 of an object-side surface of the sixth lens, a curvature radius R12 of an image-side surface of the sixth lens, a curvature radius R13 of an object-side surface of the seventh lens, and a curvature radius R14 of an image-side surface of the seventh lens meet 0.2<(R11+R12)/(R13+R14)<1.5.

6. The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further comprises a diaphragm disposed at the optical axis, and a distance SL on the optical axis from the diaphragm to an imaging surface of the optical imaging lens and a distance TTL on the optical axis from the object-side surface of the first lens to the imaging surface meet 0.4<SL/TTL<0.7.

7. The optical imaging lens as claimed in claim 1 , wherein a synthetic focal length f23 for the second lens and the third lens, and a synthetic focal length f56 for the fifth lens and the sixth lens meet 0.5<f56/f23<1.3.

8. The optical imaging lens as claimed in claim 1 , wherein an on-axis distance SAG42 from an intersection between an image-side surface of the fourth lens and the optical axis to an effective radius vertex on the image-side surface of the fourth lens, an on-axis distance SAG51 from an intersection between an object-side surface of the fifth lens and the optical axis to an effective radius vertex on the object-side surface of the fifth lens, and an on-axis distance SAG62 from an intersection between an image-side surface of the sixth lens and the optical axis to an effective radius vertex on the image-side surface of the sixth lens meet 0.6<SAG62/(SAG42+SAG51)<1.2.

9. The optical imaging lens as claimed in claim 1 , wherein a central thickness CT7 of the seventh lens on the optical axis, an on-axis distance SAG71 from an intersection between an object-side surface of the seventh lens and the optical axis to an effective radius vertex on the object-side surface of the seventh lens, and an on-axis distance SAG72 from an intersection between an image-side surface of the seventh lens and the optical axis to an effective radius vertex on the image-side surface of the seventh lens meet 1.0<(SAG72−SAG71)/CT7<2.4.

10. The optical imaging lens as claimed in claim 1 , wherein an effective semi-diameter DT11 of the object-side surface of the first lens and an effective semi-diameter DT72 of an image-side surface of the seventh lens meet 1.0<DT11/DT72<1.5.

Assignees

• Zhejiang Sunny Optical Co Ltd

Inventors

• Huang Wenbo
• He Lingbo
• Dai Fujian
• Zhao Liefeng

Classifications

• G02B13/0045 Primary

  having five or more lenses · CPC title

• G02B9/64

  having more than six components · CPC title

• G02B13/06

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