LENS MODULE WITH GRATING

Abstract

A lens module (100) includes a barrel (10), a lens (20), an image sensor module (30) and a grating (22). The lens is received in the barrel for focusing optical signals. The image sensor module is installed on an end of the barrel for receiving and transforming the optical signals. The grating is formed on the lens for preventing unnecessary optical signals from being received by the image sensor module.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Many aspects of the lens module can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the lens module. Moreover, in the drawings, like reference numerals designate corresponding parts through out the several views.

FIG. 1 is a cut-away view of a lens module in accordance with a first embodiment of the present lens module with grating;

FIG. 2 is an enlarged cut-away view of a lens of the lens module in accordance with the first embodiment of the present lens module with grating;

FIG. 3 is a cut-away view of a lens module in accordance with a second embodiment of the present lens module with grating; and

FIG. 4 is an enlarged cut-away view of a lens of the lens module in accordance with the second embodiment of the present lens module with grating.

Claims

1. A lens module, comprising: a barrel;a lens received in the barrel, the lens including a lens portion formed on a centre of the lens and a grating formed around the lens portion, the lens portion being configured for directing a first portion of image light toward an image media, the grating being configured in a manner so as to prevent a second portion of image light from reaching the image media.

2. The lens module as claimed in claim 1, wherein the barrel is a cylinder including a inner surface, a screening end and an installing end positioned opposite to the screening end.

3. The lens module as claimed in claim 2, wherein the barrel defines an opening in the centre of the screening end, a conical sidewall and a cylindrical sidewall are formed around the opening.

4. The lens module as claimed in claim 2, wherein the lens includes an outer surface and an mounting portion, the outer surface is shaped corresponding to the shape of the inner surface, and the mounting portion is formed around the grating.

5. The lens module as claimed in claim 1, wherein the grating is a diffractive grating, the grating includes an opaque film and a plurality of transmitting slots; the opaque film is an annular film covering an area around the lens portion, and each transmitting slot is an annular slot formed around the lens portion and through the opaque film.

6. The lens module as claimed in claim 1, wherein the grating is a reflective grating, the reflecting grating is a film made of reflexible materials and covers an area around the lens portion.

7. The lens module as claimed in claim 6, wherein the grating defines a plurality of reflecting slots therein, where each reflecting slot is an annular slot formed around the lens portion and has a triangular section, thus a serrated surface is formed on the grating.

8. The lens module as claimed in claim 2, wherein the image sensor module includes a base and an image sensor, the base is installed on the installing end of the barrel, the image sensor is secured on the base and received in the barrel.

9. A camera module, comprising: a barrel;a lens received in the barrel for focusing optical signals;an image sensor module arranged to receive the optical signals; anda grating formed on the lens for preventing unnecessary optical signals from being received by the image sensor module.

10. The camera module as claimed in claim 9, wherein the barrel is a cylinder including an inner surface, a screening end and an installing end positioned opposite to the screening end.

11. The camera module as claimed in claim 10, wherein the barrel defines an opening in the centre of the screening end, a conical sidewall and a cylindrical sidewall are formed around the opening.

12. The camera module as claimed in claim 10, wherein the lens includes an outer surface, a lens portion and an mounting portion; the outer surface is shaped corresponding to the shape of the inner surface, the lens portion is formed on the centre of the lens, the grating is formed around the lens portion, the mounting portion is formed around the grating.

13. The camera module as claimed in claim 12, wherein the grating is a diffractive grating, the grating includes an opaque film and a plurality of transmitting slots; the opaque film is an annular film covering an area around the lens portion, each transmitting slot is an annular slot formed around the lens portion and through the opaque film.

14. The camera module as claimed in claim 12, wherein the grating is a reflective grating, the grating is a film made of reflexible materials and covers an area around the lens portion.

15. The camera module as claimed in claim 14, wherein the grating defines a plurality of reflecting slots therein, each reflecting slot is an annular slot formed around the lens portion and has a triangular section, thus a serrated surface is formed on the grating.

16. The camera module as claimed in claim 10, wherein the image sensor module includes a base and an image sensor, the base is installed on the installing end of the barrel, the image sensor is secured on the base and received in the barrel.

17. A lens comprising: a lens portion formed on a centre of the lens; anda grating portion formed around the lens portion.

18. The lens as claimed in claim 17, wherein the lens includes a planar mounting portion formed around the grating portion.

19. The lens as claimed in claim 17, wherein the grating portion is a diffractive grating, the grating includes an opaque film and a plurality of transmitting slots; the opaque film is an annular film covering an area around the lens portion, and each transmitting slot is an annular slot formed around the lens portion and through the opaque film.

20. The lens as claimed in claim 17, wherein the grating portion is a reflective grating, the reflecting grating is a film made of reflexible materials and covers an area around the lens portion.