（alt：the picture show of Thongchuangxin)
Want to complete the production of a printed circuit board, it is necessary to go through layers of production and processing, today by small series to introduce the type of its surface layer, such as the following example:
(1) signal layer: mainly used for placing components or wiring.Protel DXP usually consists of 30 intermediate layers, namely Mid Layer1~Mid Layer30. The middle layer is used to arrange the signal line, and the top layer and the bottom layer are used to place components or copper coating.
(2) protection layer: it is mainly used to ensure that the parts on the circuit board that do not need to be coated with tin are not coated with tin, so as to ensure the reliability of the circuit board operation.PCB has top layer and bottom layer;According to the customer's needs, select the color of resistance welding, (the color of resistance welding and the color of characters are not the same).
(3) screen printing layer: mainly used to print the serial number, production number and company logo of components on printed circuit board.
(4) internal layer: wiring layer mainly used as a signal.
The above is the production process when the production of printed circuit board must have, tongchuangxin electronics specializing in the production of customized single, double and multi-layer circuit board for more than 20 years, in strict accordance with the production process, committed to providing customers with the best quality products, choose us, you are trustworthy!
amy skype: live:.cid.90e50f1e636bc2fd