Optical coupling apparatus and method for manufacturing the same
An object of the invention is to provide an optical coupling apparatus in which light-transmitting resin is prevented from entering a hole of a substrate, and a method for manufacturing the same. In this construction, a cushioning pattern is formed around each of the holes on the surface of the substrate. During a primary molding operation, a protrusion of an upper mold is brought into press-contact with the cushioning pattern formed around the hole of the substrate, so that the hole is blocked up perfectly, thereby preventing the light-transmitting resin from entering the hole.
1. An optical coupling apparatus comprising:
a substrate having a hole;
a light-emitting element disposed on the substrate;
a light-receiving element disposed on the substrate;
a cushioning member disposed around an opening of the hole on a surface of the substrate;
a pair of primary molded bodies made of light-transmitting resin, for covering the light-emitting element and the light-receiving element, respectively; and
a secondary molded body made of light-shielding resin interposed between the primary molded bodies, the secondary molded body being fixed onto the substrate by being fitted into the hole of the substrate.
2. The optical coupling apparatus of claim 1 ,
wherein the hole of the substrate is so shaped that its diameter changes gradually so as to be stepped-configured,
and wherein an inner wall defining the hole is subjected to metal plating treatment.