| 摘要 |
PROBLEM TO BE SOLVED: To provide an optically-coupled element which is hardly affected by noise by providing a lead frame which is connected to a ground potential between a light emitting element and a light receiving element in the element. SOLUTION: An optical coupler 10 is constituted by mounting a light emitting element 11 and a light receiving element 14 on lead frames and, after molding the elements 11 and 14 with a light-transmissive resin, transfer-molding the whole body with a sealing resin 22. The light emitting element 11 is mounted on a light emitting-side lead frame 13a and a drive circuit element 12 which drives the light emitting element 11 is mounted on another light emitting-side lead frame 13b. The light receiving element 14 is mounted on a light receiving- side lead frame 16a and a signal processing circuit 15 which processes the signals received by means of the light receiving element 14 is mounted on another light receiving-side lead frame 16b. A dummy frame 18 which is a lead frame to be connected to a ground potential is formed between the light emitting and receiving elements 11 and 14. Therefore, the malfunction of the optical coupler 10 caused by noise, such as unnecessary radiation, etc., can be reduced when the coupler 10 is operated. |
