Imaging lens and camera module

Patent metadata

Field	Value
Publication number	US-9341814-B2
Application number	US-201414336662-A
Country	US
Kind code	B2
Filing date	Jul 21, 2014
Priority date	Dec 14, 2009
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

Provided is an imaging lens and a camera module, the device including in an orderly way from an object side, a first lens with positive (+) refractive power; a second lens with negative (−) refractive power; a third lens with negative (−) refractive power; a fourth lens with negative (−) refractive power; and a fifth lens with negative (−) refractive power, wherein the lens is concavely formed at an object side surface.

First claim

What is claimed is:

1. An imaging lens comprising: in order from an object side of the imaging lens:
a first lens of a positive lens having a convex surface on the object side thereof;
a second lens of a negative lens having a concave surface on the image side thereof;
a third lens having aspheric faces at both an object side surface and an image side surface;
a fourth lens in a meniscus shape having a concave surface on the object side thereof; and
a fifth lens of a negative lens in a meniscus shape,
wherein the third lens has an object-side surface that is concave at the optical axis.

2. The imaging lens according to claim 1 , wherein the third lens has a meniscus shape at the optical axis.

3. The imaging lens according to claim 1 , wherein the fifth lens has a meniscus shape at the optical axis and a convex surface on the object side thereof.

4. The imaging lens according to claim 1 , wherein the first lens has a meniscus shape at the optical axis.

5. The imaging lens according to claim 1 , wherein the fourth lens and the fifth lens are aspheric at both an object side surface and an image side surface.

6. The imaging lens according to claim 1 , wherein both surfaces of the second lens have a concave surface.

7. The imaging lens according to claim 1 , wherein the fourth lens has a meniscus shape at the optical axis.

8. The imaging lens according to claim 1 , wherein the fifth lens has all aspheric inflection points at the object side surface and an image side surface.

9. The imaging lens according to claim 1 , wherein the imaging lens satisfies a condition of 0.5<f1/f<1.5, where an overall focal length of the imaging lens is f, and a focal length of the first lens is f1.

10. The imaging lens according to claim 1 , wherein the imaging lens satisfies a condition of 0.5<ΣT/f<1.5, where an overall focal length of the imaging lens is f, and a distance from an object side surface of the first lens to an image-forming surface is ΣT.

11. The imaging lens according to claim 1 , wherein the imaging lens satisfies a condition of 1.6<N2<1.7, where a refractive index of the second lens is N2.

12. The imaging lens according to claim 1 , wherein the imaging lens satisfies a condition of 20<V2<30, where an Abbe number of the second lens is V2.

13. The imaging lens according to claim 1 , wherein an aperture is positioned at an object side surface of the first lens.

14. A camera module, comprising an imaging lens, a filter and a light receiving element in order from an object side, wherein the imaging lens comprises in order from an object side of the imaging lens:
a first lens of a positive lens having a convex surface on the object side thereof;
a second lens of a negative lens having a concave surface on the image side thereof;
a third lens with negative refractive power;
a fourth lens with refractive power; and
a fifth lens with refractive power and having aspheric inflection points at an object side surface and an image side surface,
wherein the following conditional expression is satisfied:
f1<|f2|<|f3|, wherein f1 is a focal length of the first lens, f2 is a focal length of the second lens, and f3 is a focal length of the third lens.

15. The camera module according to claim 14 , wherein the imaging lens satisfies a condition of 1.6<N2<1.7, where a refractive index of the second lens is N2.

16. The camera module according to claim 14 , wherein the second lens has a concave image side surface.

17. The camera module according to claim 14 , wherein the fifth lens has a convex object side surface.

18. The camera module according to claim 14 , wherein the fifth lens has negative refractive power.

Assignees

• Lg Innotek Co Ltd

Inventors

• Kwon Dukkeun

Classifications

• H04N23/55

  Optical parts specially adapted for electronic image sensors; Mounting thereof · CPC title

• G02B13/0045 Primary

  having five or more lenses · CPC title

• G02B9/60 Primary

  having five components only · 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

• G03B30/00

  Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles · CPC title