| 摘要 |
If a light-emitting side FOT 35 and a light-receiving side FOT 36 each having an optical element and a plurality of pin-like lead frames 55 is covered by a shield case 37 formed of an electrically conductive metallic plate, a ground pin 71 of the shield case 37 is positioned immediately behind a lead frame 55b which functions as a ground pin among the plurality of lead frames 55. |
