Branch Snyder Department of International Ltd. Shenzhen-Electronic Technology Co., Ltd. - The Department of Electronic Technology Company is a professional custom single-sided, double-sided, 2-40 layer multilayer professional providers, to provide customers with high-precision, high Shenzhen circuit board quality, quality assurance Shenzhen circuit board material classification, reasonable prices. Modern computer motherboard and graphics card mostly use 4-layer PCB board Shenzhen circuit board material classification, there are some 6-layer, or even 8 layer board. Vias (via) we just mentioned Shenzhen circuit board material classification, if used in the double-sided board, then they all went through the entire board. However, in the multilayer which, if you want to connect some of these lines, it will waste some lines vias space other layers. The use of buried vias (Buried via) and blind holes (Blind vias) technology to avoid this problem. Blind hole is connected to the surface layers of the internal PCB PCB, do not have to penetrate the entire board. Buried vias only connect internal PCB, so just do not see from the surface of the Branch Snyder Department of International Ltd. Shenzhen-Electronic Technology Co., Ltd. The company is a custom 2-40 layer PCB board professional supplier Shenzhen circuit sheet classification, sheet main services provided are HDI boards, finger board, Bluetooth module board, half plate, through the plate, rigid-flex board, plywood and other series of plates. Imposition Imposition whether the gap, and the gap make-up, make-up make-up clearance gap not less than 1.6 (thickness 1.6) mm otherwise it will greatly increase the difficulty of milling job board imposition of large, overlooked the device is not the same is not the case, the imposition of a gap of about 0.5mm gapless technology edge not less than 5mm. A character width can not be less than 0.153mm (6mil), character height can not be less than 0.811mm (32mil), the ratio of height to width ratio is preferably 5 for the relationship to say, word width 0.2mm character height of 1mm. Circuit board design principles, Shenzhen circuit board, Newell Newell hit by the Shenzhen Electronic Technology Limited. Newell Shenzhen Electronic Technology Co., Ltd. (www.yipcb.com) (www.yipcb.com) strong, credible, a printed wiring board in Shenzhen, Guangdong and other industries has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Newell invasive and you hand into the brilliant, for a better future!