METHOD OF MAKING FLEXIBLE PRINTER CIRCUIT BOARDS Russian patent published in 2006 - IPC H05K7/20 

FIELD: radio electronics.

SUBSTANCE: aluminum coating is applied onto metal plate by means of thermal decay; thickness of the coating is 20-25 mcm. Then metal-resistive nickel or cobalt coating with thickness of 4-5 mcm is applied onto the same plate as well as electro-conductive copper or molybdenum coating with thickness of 20-30 mcm. After that by method of photolithography the pattern of board is made and it is subsequently covered with thin layer of polymer with thickness of 80-100 mcm. Then molybdenum film with electro-conductive circuit and metal-resistive coating is removed by solving aluminum layer. To make two-sided flexible printed circuit boards, after pattern of electro-conductive circuit is made by method of photolithography, two board are connected together by polymer layer at the side of electro-conductive circuit and then aluminum layers are dissolved and metal plates are removed.

EFFECT: improved reliability; simplification; reduced cost.

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