The history of the single panel:
Single sided printed circuit board is in the early 1950 s with the emergence of transistors, developed products, centered in the United States was the main method for copper foil etching method directly for the mainstream. For the first time in 1953 ~ 1955, the Japanese use imported copper foil made paper phenolic copper foil substrates, and a large number of applications in the radio. In 1956, the Japanese professional circuit board manufacturer, manufacturing technology and rapid progress of the single panel. In terms of material, early with paper phenolic copper foil substrate is given priority to, but because of the low phenolic electrical insulation material, welding heat resistance is poor, the distortion factors, such as paper ring gas with resin, fiberglass epoxy resin, such as material was developed, the current consumer electronic machine for single panel, almost use paper phenolic backing board.
The characteristics of the single panel:
Is on the most basic of PCB, single panel parts on one side, conductor is focused on the other side. Because wires only appear on one side, so we called this kind of PCB is built and a Single panel (Single sided). Because single panel in the design of lines, there are many restrictions (because only one side, wiring must around the path alone cannot cross between), so only use this kind of early circuit boards;
Single panel wiring diagram for online Printing (Screen Printing) is given priority to, that is, in the copper surface printed on resistance agent, to prevent welding resistance after etching printed on mark, and then punching processing way to complete the parts guide hole and the appearance. In addition, part of a small amount of diverse products, are using photosensitive resistance agent forming pattern of the photographic method.