FLEXIBLE PRINTED CIRCUIT FORMING BODY HAVING ELECTROMAGNETIC WAVE SHIELD

摘要

PURPOSE:To obtain an FPC withstanding bending by forming a copper foil wiring circuit on the surface of a heat resistant plastic film, and forming an undercoat layer, a conductive paste shield layer, and an overcoat layer in this order on the circuit. CONSTITUTION:A straight copper foil circuit 1 is formed by etched foil method on a polyimide film 2. Masks are formed at regular intervals in the direction of the length of the circuit on the grand patterns 3 at the edged of the copper foil circuit 1 and paste of epoxy melamine resin is applied to form an undercoat layer 4. A through hole 5 is formed in the ground patterns 3 with the masks. conductive paint is applied and hardened by heating to form a shield layer 4, which is connected with the ground patterns 3 through the through holes 5. A thermosetting coating material is applied on the shield layer 7 and hardened by heating to form an overcoat layer.