East conduction technology to teach to talk about the copy board series 13: Four flexible printed circuit board
Update date：2012-7-5
Flexible circuits: single-sided, double-sided, multilayer flexible board and rigid board four kinds. East guide technology to help you explain it in detail. ① single-sided flexible board is the lowest cost, less demanding on the electrical properties of printed circuit board. Single-sided wiring, you should use single-sided flexible board. With a layer of chemical etching the conductive pattern in the conductive pattern layer of flexible insulating substrate surface for the rolled copper foil. The insulating substrate may be polyimide, polyethylene terephthalate, aromatic polyamide fiber ester and polyvinyl chloride. The ② sided flexible board is insulated basement membrane on both sides of each layer of etching the conductive pattern made of. Through holes of the insulating material on both sides of graphics connected to form a conductive path, to meet the deflection of the design and use of functions. Cover film can protect the single-sided wire and indicate components placed in the position. The ③ multilayer flexible board is three layers or more layers of single-sided or double-sided flexible circuits laminated together by drilling [J], plating the formation of through holes to form a conductive path between the different layers. In this way, without using complex welding process. Multilayer circuit at a higher reliability, better thermal conductivity and easier assembly performance has huge functional differences. When designing the layout, should take into account the mutual influence of the assembly size, number of layers, and flexible. The ④ traditional rigid flexible board is composed of rigid and flexible substrates selectively laminated together. Compact to form a conductive connection to the metallization larvae L. If a printed circuit board is negative has a component, rigid flexible board is a good choice. If all components are in the side, then use double-sided flexible board and laminated on the back of a layer of FR4 reinforcements would be more economical. ⑤ hybrid structure of the flexible circuit is a multilayer conductive layer is composed of different metals. An 8-layer FR-4 as the inner media, the use of polyimide as the outer layer of the medium from three different directions of the motherboard out of the lead, each lead is made of different metals. Constantan alloy, copper and gold were independent leads. This hybrid structure is mostly used in more demanding electrical signal is converted and the relationship of heat conversion and electrical properties of low temperature case, is the only viable solution. Even within the adoption of ease of design and total cost evaluation, in order to achieve the best cost performance.
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