Apparatus for exposure of both sides of printed circuit plates

摘要

The equipment is intended for exposing both side of printed circuit plates by means of a contact print. The equipment comprises a master copy and printed circuit plates holder in a rack provided with feeding elements and guided in parallel between two light sources and comprising respectively one portion above and below the exposure plane. The holder is formed of a dual frame (1) the two frame portions 2,2' of which are formed to be moved part and together relative to one another and in parallel to one another and while remaining in a position parallel with respect to one another. Located in the frame portions (2,2') of the dual frame (1) is respectively one transparency (4) framed by a frame (5) provided at least on one side thereof with alignment elements (15), with suction ports (7) being provided in its counterdirected surfaces (6) along the circumferential edges thereof. The said frames (5) are formed to precisely conform in size with respect to one another to be suitably placed into the frame portions (2,2').