Patent Application
20080023545
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.
Referring now to the drawings in detail,
The barrel 20 is a hollow cylinder in shape and the barrel 20 includes an inner surface 201, a screening end 21 and a mounting end 22 positioned opposite to the screening end 21. The barrel 20 defines an aperture 23 at a central portion of the screening end 21. The lens 30 is mounted in the barrel 20 facing the aperture 23. Understandably, a plurality of lenses 30 can also be mounted in the barrel 20.
The image sensing module 40 includes an image sensor 41, a top board 42, a carrier (not labeled) having a base board 43 and a sidewall (not labeled) extending upward from a periphery of the base board 43, and a filtering film 44. The image sensor is mounted on the base board 43. The top board 42 is made of transparent material such as glass or plastic. A periphery of the top board 42 is mounted on the sidewall of the carrier to form a closed cavity, and the image sensor 41 is packaged within the cavity and mounted on the base board 43. The filtering film 44 is made of different kinds of oxide such as Ta2O5, TiO2, SiO2, etc., and the filtering film 44 can reduce infrared light transmitted therethrough. The filtering film 44 can be attached to glass by means of plating or gluing, thus the filtering film can be formed to have a thickness less than the IR-cut filter 122 used in typical lens modules. The filtering film 44 is applied to a top surface of the top board 42 between the lens 30 and the top board 42 by means of plating or gluing, thus the top board 42 is sandwiched between the filtering 44 and the base board 43.
In assembly, the image sensing module 40 is mounted on the mounting end 22 of the barrel 20. The filtering film 44, the top board 42 and the image sensor 41 are positioned in a line on a light-path of the lens 30. In use, light enters the lens barrel 20 via the aperture 23, and passes sequentially through the lens 30, the filtering film 44 and the top board 42, and finally reaches the image sensor 41 to form an object image thereon.
Understandably, the filtering film 44 is used in the lens module 200 to replace IR-cut filters in typical lens modules, thus weight and volume of the lens module 200 can be reduced since the filtering film 44 has a thickness less than the IR-cut filter 122 used in typical lens modules.
Understandably, weight and volume of the lens module 300 can be reduced in a fashion similar to the lens module 200. Additionally, because the filtering film 44 is mounted between the top board 42 and the base board 43, the top board 42 of the lens module 300 can prevent the filtering film 44 from being contaminated by dust particles or water vapour.
The image sensor 51 is mounted on the base board 53. The top board 52 can be a lens or a plate made of transparent materials such as glass or plastic. The connecting member 55 is an annular component with a stepped hole (not labeled) defined in a central portion therethrough and a bottom flange adjacent the stepped hole. The top board 52 is received in the stepped hole of the connecting member 55. The connecting member 55 is mounted on the sidewall above the base board 53 to enclose the cavity, and the image sensor 51 is packaged within the cavity and mounted on the base board 53. The filtering film 54 is received in the stepped hole of the connecting member 55 and sandwiched between the top board 52 and the bottom flange of the connecting member 55.
In assembly, the image sensing module 50 is mounted on the mounting end 22 of the barrel 20, and the top board 52, the filtering film 54 and the image sensor 51 are located on a light-path of the lens 30 one by one. Use of the lens module 400 is similar to use of the lens module 300.
Understandably, weight and volume of the lens module 400 can be reduced similar to the lens module 200 and the lens module 300, and the filtering film can be protected. Additionally, in the lens module 400, the top board 52 is mounted on the carrier via the connecting member 55, which is more convenient compared to gluing or welding the inner surface of the top board 52 with the filtering film 54 to the carrier directly. Alternatively, the filtering film 54 can also be mounted an outside of the top board 52.
It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the present invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of present invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
| Number | Date | Country | Kind |
|---|---|---|---|
| 200610061869.2 | Jul 2006 | CN | national |
