| 摘要 |
<p>PURPOSE:To stabilize the shape of a light transmitting layer and stabilize current transmission characteristics by a method wherein a frame which surrounds a light emitting device and a photodetector, a case containing a spacing piece and the light transmitting layer which constitutes a light path and is made of light transmitting resin are provided. CONSTITUTION:A case 15 includes a bottom plate 16, a frame 17 which is stood on the bottom plate 16 and surrounds a light emitting device 11 and a photodetector 12 and a spacing piece 18 dividing the frame 17. The light emitting device 11 and the photodetector 12 provided in the case 15 are covered with a light transmitting layer 20. The light transmitting layer 20 is made of silicone resin or the like and couples the light emitting device 11 and the photodetector 12 optically and provides a light path through which the light from the light emitting device 11 reaches the photodetector and is covered with a light shielding layer 21 made of epoxy resin or the like. With this constitution, the shape of the light transmitting layer 20 is stabilized and a dielectric strength between an input side and an output side can be improved.</p> |
