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The characteristics of single-sided board
The products of single-sided boards came out centered in American with the apperance of transistor in early 1950s. At that time, it mainly produced by etching the copper foil directly. During 1953~1955, Japanese utilized imported copper and produced paper phenolic aldehyde copper foil substract for the first time and widely used in radio products. In 1956, after the apperance of Japanese professional manufacturers, the manufacturing technology for single-sided board improved rapidly. For materials, in early stage mainly was paper phenolic aldehyde copper foil substract; but as phenolic aldehyde materials has weak electric insulativity, weak soldering heat-resistance, distortion and other disadvantages, gradually appeared paper epoxy resin, glass fiber epoxy resin.  Currently the single-sided boards that used in consumer electroics are mainly paper phenolic aldehyde substrates.
Single-sided board is board that concentrate the parts on one side and wires on the other side. As the wires only appear on one side, thus we call this board single-sided board. There are strict limits on single-sided board, as it has wires on one side and the wires cannot cross and must have their own ways, only early circuits used this kind of boards. The wiring diagram of single-sided board mainly by screen printing, that is print resist on copper surface, and print the mark in SM process after etching; then finish the guide holes and profile by punching holes or routing. In addition, some products that with samll amount but diversity may use the method that forming pattern through photosensitive resistance agent.
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