TWI427392B - Holder, method for making same and camera module having same - Google Patents

Description

Mirror holder, manufacturing method thereof and camera module

The invention relates to a lens holder, a manufacturing method thereof and a camera module having the same.

Camera functionality has become one of the main functions that are indispensable for a variety of portable electronic products such as cell phones and personal digital assistants (PDAs). The camera module typically includes at least one lens module and an image sensor component disposed opposite the lens module. The lens module generally includes a lens holder, a lens barrel disposed on the lens holder, and an optical component such as a lens group, a spacer ring, and a filter that are sequentially fixed in the lens barrel in the optical axis direction. The image sensor component is usually packaged in the lens holder and used in conjunction with the lens module for imaging.

However, the material of the lens holder of the existing lens module is plastic such as PC/ABS (polypropylene/acrylonitrile-butadiene-styrene) engineering plastic, polytetrafluoroethylene, etc., and usually does not have good anti-electromagnetic interference capability. The image sensor component is susceptible to external electromagnetic waves to generate noise, and the electromagnetic wave interference can be passed through the sixth international seminar on instrumentation and control technology of the SPIE system in October 2006 (Sixth International). The electromagnetic interference measurement system disclosed in the Radiation electromagnetic interference (EMI) measurement system published in Symposium on Instrumentation and Control Technology. The interference of the electromagnetic wave causes a clear image to be obtained, resulting in poor image quality. When the imaging resolution is high, the influence of external electromagnetic waves on the image quality of the image sensor component is more obvious.

At present, a copper/stainless steel anti-electromagnetic interference coating can be formed on the outer surface of the lens holder by coating to reduce the interference of electromagnetic waves on the image sensor components matched with the lens module, but this method requires expensive coating. Equipment and vacuum system.

In view of this, it is necessary to provide a lens holder having a lower cost, a manufacturing method thereof, and a camera module.

A lens holder is made of a composite material mainly composed of a carbon nanotube, a carbon black and a polymer and having an anti-electromagnetic interference function, and the carbon nanotube and the carbon black are dispersed in the polymer.

A manufacturing method of the above lens holder, comprising the steps of: preparing a mixture comprising a carbon nanotube and a carbon black; and mixing the mixture comprising the carbon nanotube and the carbon black with the polymer to heat the carbon nanotube And the carbon black is dispersed in the polymer to obtain a composite material having an anti-electromagnetic interference function mainly composed of a carbon nanotube, a carbon black and a polymer; and the composite material is used as a raw material, and the lens holder is obtained by an injection molding method.

A camera module includes: at least one lens; a lens barrel housing the at least one lens; a lens holder; and an image sensing module disposed on the lens holder opposite to the lens barrel On one side, the material of the mirror holder is a composite material mainly composed of a carbon nanotube, carbon black and a polymer having electromagnetic interference resistance, and the carbon nanotube and the carbon black are dispersed in the polymer.

Compared with the prior art, the lens holder of the camera module is formed by injection molding by a carbon nanotube, carbon black and polymer composite material having good resistance to electromagnetic interference, thereby eliminating the use of expensive coating equipment and vacuum. The steps of the system are lower cost.

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Please refer to FIG. 1 and FIG. 2 , which are a camera module 100 according to an embodiment of the present invention. The camera module 100 includes a plurality of lenses 40 , a lens barrel 10 for housing the plurality of lenses 40 , a lens holder 20 , and an image sensing module 50 . The lens barrel 10, the lens holder 20, and the plurality of lenses 40 constitute a lens module.

The outer wall of the lens barrel 10 is provided with an external thread. The lens holder 20 includes a cylindrical portion 202 and a square-shaped portion 204 that penetrates the cylindrical portion 202. The inner wall of the cylindrical portion 202 is provided with internal threads that are engageable with the external threads of the barrel 10.

The image sensing module 50 includes an image sensor 502 and a circuit board 504. The image sensor 502 can be a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor Transistor (CMOS). The image sensor 502 is packaged on the circuit board 504 and disposed in the frame portion 204 of the lens holder 20.

The image sensing module 50 is disposed on the other side of the lens holder 20 relative to the lens barrel 10. The image sensing module 50 is disposed in the lens holder 20 , that is, disposed at the square portion 204 of the lens holder 20 . The image sensor 502 can be a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS).

The material of the lens holder 20 is a composite material mainly composed of a carbon nanotube 208, a carbon black 207 and a polymer 206. The carbon nanotube 208 and the carbon black 207 are dispersed in the polymer 206, the carbon nanotube 208% by weight of the polymer 206 is from 1.0% to 15%, and the carbon black 207 is from 1.0% to 10% by weight of the polymer 206. The polymer 206 material is Polycarbonate, Polycarbonate/Acrylonitrile Butadiene Styrene (PC/ABS), Polycarbonate/Glass fiber. , polyphthalamide (PPA), or polyphenylene oxide (PPO). The carbon nanotube 208 can be a single-walled carbon nanotube or a multi-walled carbon nanotube.

The above lens holder can be manufactured by the following methods:

In the first step, a mixture comprising a carbon nanotube 208 and a carbon black 207 is prepared by an arc discharge method.

In step two, the mixture comprising the carbon nanotube 208 and the carbon black 207 and the polymer 206 are mixed by heating to disperse the carbon nanotube 208 and the carbon black 207 in the polymer 206, thereby obtaining a carbon nanotube mainly. 208, carbon black 207 and polymer 206 are composite materials with anti-electromagnetic interference function.

In the third step, the composite material is used as a raw material, and the lens holder 20 is obtained by injection molding.

Compared with the prior art, the lens holder 20 of the camera module 100 is formed by injection molding by a carbon nanotube, carbon black and polymer composite material having good resistance to electromagnetic interference, thereby eliminating the need for expensive coating equipment. With the vacuum system step, the cost is lower.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

10. . . Lens barrel

100. . . Camera module

40. . . lens

20. . . Mirror holder

50. . . Image sensing module

202. . . Cylindrical part

204. . . Square shaped part

502. . . Image sensor

504. . . Circuit board

208. . . Carbon nanotube

207. . . Carbon black

206. . . polymer

FIG. 1 is a cross-sectional view of a camera module according to an embodiment of the present invention.

Figure 2 is a partial enlarged view of Figure 1.

10. . . Lens barrel

100. . . Camera module

40. . . lens

20. . . Mirror holder

50. . . Image sensing module

202. . . Cylindrical part

204. . . Square shaped part

502. . . Image sensor

504. . . Circuit board

208. . . Carbon nanotube

207. . . Carbon black

206. . . polymer

Claims (8)

A lens holder is improved in that the material of the lens holder is a composite material mainly composed of a carbon nanotube, carbon black and a polymer having electromagnetic interference resistance, and the carbon nanotube and the carbon black are dispersed in the polymer in. The lens holder according to claim 1, wherein the polymer material is polycarbonate, polycarbonate/acrylonitrile-butadiene-styrene, polycarbonate/glass fiber, polyphthalate Guanidine or polyphenylene ether. The lens holder according to claim 1, wherein the carbon nanotube is a single-walled carbon nanotube or a multi-walled carbon nanotube. A method of manufacturing a lens holder according to claim 1, comprising the steps of: preparing a mixture comprising a carbon nanotube and carbon black; and mixing the mixture comprising the carbon nanotube and the carbon black with the polymer The carbon nanotubes and the carbon black are dispersed in the polymer by heating and mixing, and a composite material mainly composed of a carbon nanotube, a carbon black and a polymer having an anti-electromagnetic interference function is obtained; and the composite material is used as a raw material. The mirror holder was obtained by injection molding. The method of manufacturing a lens holder according to claim 4, wherein the mixture comprising the carbon nanotubes and the carbon black is prepared by an arc discharge method. A camera module includes: at least one lens; a lens barrel housing the at least one lens; a lens holder; and an image sensing module disposed on the lens holder opposite to the lens barrel On one side, the material of the mirror holder is a composite material mainly composed of a carbon nanotube, carbon black and a polymer having electromagnetic interference resistance, and the carbon nanotube and the carbon black are dispersed in the polymer. The camera module of claim 6, wherein the polymer material is polycarbonate, polycarbonate/acrylonitrile-butadiene-styrene, polycarbonate/glass fiber, poly-o-phenylene Formamide or polyphenylene ether. The camera module of claim 6, wherein the carbon nanotube is a single-walled carbon nanotube or a multi-walled carbon nanotube.