Invention Grant
- Patent Title: Electromagnetic wave shielding film and method for producing a circuit board comprising the shielding film
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Application No.: US14482674Application Date: 2014-09-10
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Publication No.: US09609792B2Publication Date: 2017-03-28
- Inventor: Zhi Su
- Applicant: Guangzhou Fang Bang Electronics Co., Ltd.
- Applicant Address: CN Guangzhou
- Assignee: GUANGZHOU FANG BANG ELECTRONICS CO., LTD.
- Current Assignee: GUANGZHOU FANG BANG ELECTRONICS CO., LTD.
- Current Assignee Address: CN Guangzhou
- Agency: Bond, Schoeneck & King, PLLC
- Agent William Greener; Jonathan Gray
- Priority: CN201410016769 20140114
- Main IPC: H05K9/00
- IPC: H05K9/00 ; H05K1/02

Abstract:
The present invention discloses an electromagnetic wave shielding film, comprising at least one electromagnetic shielding layer. A printed circuit board comprising the shielding film, is formed by tightly connecting the electromagnetic wave shielding film with the printed circuit board in the direction of thickness, wherein a ground layer is disposed on said printed circuit board. A method for producing the circuit board, including the following steps: (1) hot-pressing and curing the electromagnetic shielding film with the circuit board in the direction of thickness; (2) piercing the adhesive film layer by a rough surface of the electromagnetic shielding layer, to achieve grounding. Or, including the following steps: (1) hot-pressing and curing the electromagnetic shielding film with the circuit board in the direction of thickness; (2) piercing the shielding film by an electrically conductive substance, to achieve grounding. Or, including the following steps: (1) hot-pressing and curing the electromagnetic shielding film with the circuit board in the direction of thickness; (2) forming through holes or blind holes in the circuit board; (3) metallizing the holes, to achieve grounding. The adhesive film layer of the shielding film of the present invention contains no conductive particle, so that the cost and the insertion loss are reduced, and the development demand of high-speed and high-frequency of the electronic products is met.
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