| 摘要 |
<p>PROBLEM TO BE SOLVED: To satisfactorily suppress the fluctuation of a characteristic by the change of external environment such as withstand voltage and thermal stress by constituting translucent resin of rubber like Si resin and gel-like Si resin. SOLUTION: A light-emitting element 11 and a light-receiving element 12 are oppositely arranged. Translucent gel-like Si resin 16 is inserted in the gap and an optical path which optically connects the two elements is formed. The periphery of parts is coated with non-translucent external molding resin 17 except for the end parts of lead frames 13 and 14 for light-emitting element and light-receiving element. When a system operates, light becoming a signal radiated from the light-emitting element 11 is transmitted through translucent rubber-like Si resin 15a on the lightemitting element side, translucent gel-like Si resin 16 and translucent rubber-like Si resin 15b on the light-receiving element side, it reaches the light-receiving element 12 and an optically coupled semiconductor device operates. Thus, bubbles are prevented from adhering to the surfaces of the respective elements and the route of light is not prevented. Consequently, a light-emitting operation and a light-receiving operation are smoothly executed.</p> |
