The present invention relates generally to electromagnetic shielding technology, and more particularly, to a circuit board assembly having a electromagnetic shielding device.
The current trend in the electronic industry is to miniaturize components and circuits and to place as many components and circuits next to each other as possible to provide quality technical performance in a small package. Any device that conveys electrical signals, such as a wire, a printed circuit board (PCB), an integrated circuit (IC) and the like radiates and is typically susceptible to electromagnetic interference (EMI) and/or radio frequency interference (RFI). EMI and RFI affect devices by corrupting or altering electrical signals conveyed by the devices. Such corruption or alteration of the electrical signals in the devices is usually not tolerable. Thus, it is critical to shield these devices from each other and other electromagnetic interference and radio frequency interferences.
Referring to
In addition, the shielding case 3 can also protect the body 1 from EMI or RFI from outside. However, the conductive foam portions 4 are mounted on the bottom of the shielding case 3 manually, thus increasing cost. Further, manual installation of the conductive foam portions 4 may lead to error, which can lead to poor or no contact between the conductive foam portions 4 and the grounding ends 2.
In accordance with an embodiment, a circuit board assembly includes a circuit board, at least an conductive contact and a metal shielding device. The circuit board includes a base having a printed circuit formed thereon and at least a grounding end electronically connected to the printed circuit. The conductive contact is extended from a lateral edge of the base and is electrically connected to the grounding end. The circuit board and the conductive contact are received in the metal shielding device with the conductive contact electrically connected to the metal shielding device.
The present invention is described in greater detail hereinafter, by way of example only, through description of a preferred embodiment thereof and with reference to the accompanying drawing in which:
The detailed explanation of a circuit board assembly having a electromagnetic shielding device according to the present invention will now be made with reference to the drawing attached hereto.
Referring to
The circuit board 11 includes a base 12 with two opposite surfaces, at least a grounding end 13 disposed at one of the opposite surfaces, a data line 14 extending form a lateral edge connecting the two opposite surfaces and a number of pads 15 disposed at the other one of the opposite surfaces. The data line 14 is electrically connected to the pads 15 and configured for transmitting data.
The circuit board 11 can be a printed circuit board (PCB). The circuit board 11 is configured for fixing a number of electrical components (not shown) thereon. In the present embodiment, the circuit board 11 is used in a lens module of a digital camera.
The base 12 can be made from an isolative, adiabatic, flexible material. A circuit (not shown) is printed on the base 12 and is configured for conveying electrical signals between the electrical components. The at least a grounding end 13 is electrically connected to the circuit of the base 12. The grounding end 13 is configured for removing a static produced by the electric components. In this embodiment, the number of the grounding end 13 is four. The pads 15 disposed on the other one of the opposite surfaces of the base 12 are configured for welding the electrical components.
The at least one conductive contact 16 is flexibly connected with the base 12 and extended from another lateral edge of the base 12. In this embodiment, the number of the at least one conductive contact 16 is also four. The conductive contacts 16 are respectively and electrically connected with the corresponding grounding ends 13. Each of the conductive contacts 16 includes a contact base 161 and a metal portion 162 mounted on the contact base 161. The contact base 161 can be integrally formed with the base 12 and then perpendicularly bent from the lateral edge of the base 12. The contact base 161 and the base 12 can be made from same isolative, adiabatic, flexible material. The metal portion 162 can be integrally formed with the corresponding grounding ends 13 or be welded with the grounding ends 13. The metal portion 162 can be made from copper or gold. In present embodiment, the metal portion 162 is integrally formed with the corresponding grounding end 13 and is made from copper.
Referring to
In assembling of the circuit board 11 and the conductive contacts 16 into the metal shielding device 17, a position of the circuit board 11 in the bottom wall 172 of the metal shielding device 17 is restricted by the side wall 171. The conductive contacts 16 are bent up and tightly contacted with the corresponding sidewalls 171. Thus, the metal portions 162 are electrically connected with the metal shielding device 17.
It is to be understood, that the contact base 161 can be connected with the lateral edge of the base 12 in some other manner. For example, only the contact base 161 is made from flexible material, and an end of the contact base 161 is riveted with the base 12. The metal portion 162 can tightly contact with the sidewalls 171 of the metal shielding device 17 by virtue of the resilience of the contact base 161. In another aspect, the base 12 and the contact base 161 can be made from stiff material, and the conductive contacts 16 elastically connected with the circuit board 11 using an elastic member (not shown), such as a spring. The metal portion 162 can still tightly contact with the sidewalls 171 of the metal shielding device 17 by virtue of the resilience of the elastic member.
Referring to
As described above, when finished assembling the circuit board 11, the conductive contacts 16, and the metal shielding device 17, a circuit board assembly having a function of electromagnetic shielding is achieved.
It can be understood that the above-described embodiment are intended to illustrate rather than limit the invention. Variations may be made to the embodiments and methods without departing from the spirit of the invention. Accordingly, it is appropriate that the appended claims be construed broadly and in a manner consistent with the scope of the invention.
Number | Date | Country | Kind |
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200710200347.0 | Mar 2007 | CN | national |