Shielding film, shielding distribution board having the same and grounding method thereof

Abstract

The invention discloses a shielding film which prevents the grounding conductor of the substrate being the adhering object of the shielding film from revealing and facilitates the grounding, a shielding distribution board which uses the shielding film and possesses a shielding function and resistance control function through one step, and the grounding method of using the shielding film. The shielding film (20) which is connected to a conducting member (30) by means of heating and pressurization is composed by resin whose melting point is higher than the heating temperature. The shielding film (10) comprises a covering film (25) which forms a layer thickness (L1) that is thinner than the average protruding length (L2) of the conducive particle (35) protruding from a conductive bonding layer (33), a metal film layer (24) which stacks on the covering film (25) in order and a bonding layer (23).

Description

technical field [0001] The present invention relates to a shield film used in a substrate having a conductor such as a flexible flat cable, a shielded wiring board having the shield film, and a ground connection of the shield film method. Background technique [0002] Conventionally, substrates with conductors such as flexible flat cables have been widely used in various electronic devices such as office automation (OA) equipment represented by televisions, video recorders, mobile phones, and personal computers. Used to connect devices within or between devices. [0003] In addition, in recent years, due to the development of the information society, electronic equipment is required to achieve high-speed electronic communication. Accordingly, in order to reduce unnecessary radiation from high-speed electrical signals or noise from the outside, flexible flat cables A shielding film is pasted on a substrate with a conductor such as. Furthermore, since it is necessary to per...

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Problems solved by technology

[0016] In this way, the flexible flat cable 50 of Patent Document 1 and the impedance-controlled shielded wiring board 60 of Patent Document 2 have the following problems: in order to obtain the shielding effect and the impedance control effect, it is necessary to deliberately provide a non-insulated part and expose the ground conductor, or it is necessary to At least two steps of forming a layer having a shielding effect and a layer having an impedance control effect will take time and cost.

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