| 摘要 |
PURPOSE:To manufacture a large number of printed circuits at low cost through a belt conveyor system by rendering at least either one of a base film or a protective layer a light shielding film. CONSTITUTION:A dry film 10 has a laminate structure formed by laminating the base film 30, e.g., made of polyester and the protective layer 40 made of, e.g., polyethylene on a photoresist layer 20, and at least one of the layer 30 and the layer 40 is made a light shielding film. As the method for imparting a light shielding property to the layers 30 or 40, the one for forming a metal vapor deposition method or the one for coloring that film itself to, e.g., yellow or the like color are practicable, thus permitting the both-face printed circuit plate to be easily manufactured. |
