Ultra-wide angle camera lens

Patent metadata

Field	Value
Publication number	US-10353193-B2
Application number	US-201615329165-A
Country	US
Kind code	B2
Filing date	Jul 19, 2016
Priority date	Mar 2, 2016
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

An ultra-wide angle camera lens is provided. The lens includes, from an object side to an image side: a first lens with negative refractive power, an image-side face of the first lens being concave; a second lens with negative refractive power, an image-side face of the second lens being concave; a third lens with positive refractive power, an object-side face of the third lens being convex; a fourth lens with positive refractive power, an image-side face of the fourth lens being convex; and a fifth lens with negative refractive power, an image-side face of the fifth lens being concave. The lens satisfies: −0.05<f/f1<0; and 1.2<ImgH/f<2, in which, f represents an effective focus length of the ultra-wide angle camera lens, f1 represents an effective focus length of the first lens L1, and ImgH is half of a diagonal line of an effective pixel region on an imaging face.

First claim

What is claimed is:

1. An ultra-wide angle camera lens comprising: from an object side to an image side,
a first lens with negative refractive power, an image-side face of the first lens being concave;
a second lens with negative refractive power, an image-side face of the second lens being concave;
a third lens with positive refractive power, an object-side face of the third lens being convex;
a fourth lens with positive refractive power, an image-side face of the fourth lens being convex; and
a fifth lens with negative refractive power, an image-side face of the fifth lens being concave,
wherein the ultra-wide angle camera lens satisfies the following relation:
−0.05< f/f 1<0, and 1.2<ImgH/ f< 2,

wherein f represents an effective focus length of the ultra-wide angle camera lens, f1 represents an effective focus length of the first lens, and ImgH is half of a diagonal line of an effective pixel region on an imaging face.

2. The ultra-wide angle camera lens according to claim 1 , wherein the ultra-wide angle camera lens satisfies the following relation:
−1.4< f 2/ f 4<−0.7, and

−1.5< f 2/ f<− 1,

wherein, f2 represents an effective focus length of the second lens, and f4 represents an effective focus length of the fourth lens.

3. The ultra-wide angle camera lens according to claim 1 , wherein the ultra-wide angle camera lens satisfies the following relation:
1< DT 22/ DT 31<1.2, and
1< DT 31/ DT 52<1.35,
wherein, DT22 represents an effective radius of the image-side face of the second lens, DT31 represents an effective radius of the object-side face of the third lens, and DT52 represents an effective radius of the image-side face of the fifth lens.

4. The ultra-wide angle camera lens according to claim 1 , wherein, the ultra-wide angle camera lens satisfies the following relation:
TTL /ImgH<4.6;
wherein, TTL represents a distance between an object-side face of the first lens and the imaging face along an axis.

5. The ultra-wide angle camera lens according to claim 1 , wherein, the ultra-wide angle camera lens satisfies the following relation:
0< T 34/ TTL< 0.1, and
0.05< T 23/ TTL< 0.16,
wherein, T34 represents a spacing distance between the third lens and the fourth lens along an axis, TTL represents a distance between an object-side face of the first lens and an imaging face along the axis, and T23 represents a spacing distance between the second lens and the third lens along the axis.

6. The ultra-wide angle camera lens according to claim 1 , wherein, the ultra-wide angle camera lens satisfies the following relation:
0.4<ΣCT/ TTL< 0.6,

wherein, ΣCT represents a sum of thicknesses of the first lens, the second lens, the third lens, the fourth lens and the fourth lens along an optical axis, and TTL represents a distance between an object-side face of the first lens and an imaging face along an axis.

7. The ultra-wide angle camera lens according to claim 1 , wherein, the ultra-wide angle camera lens satisfies the following relation:
0.6<CT1/CT5<1.35, and
0.65<CT2/CT5<1,
wherein, CT1 represents a central thicknesses of the first lens along an optical axis, CT2 represents a central thicknesses of the second lens along the optical axis, and CT5 represents a central thicknesses of the fifth lens along the optical axis.

8. The ultra-wide angle camera lens according to claim 1 , wherein, the ultra-wide angle camera lens satisfies the following relation:
1< R 1/ R 2<1.5,
wherein, R1 represents a radius of curvature of an object-side face of the first lens, and R2 represents a radius of curvature of an object-side face of the second lens.

9. The ultra-wide angle camera lens according to claim 1 , wherein, an image-side face of the third lens is convex, and an object-side face of the fourth lens is convex.

Assignees

• Zhejiang Sunny Optics Co Ltd

Inventors

• Huang Lin
• Dai Fujian

Classifications

• G02B13/06 Primary

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

• G02B25/04 Primary

  affording a wide-angle view, e.g. through a spy-hole · CPC title

• G02B13/00

  Optical objectives specially designed for the purposes specified below (with variable magnification {in general} G02B15/00) · 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

• G02B13/0045 Primary

  having five or more lenses · CPC title