| 摘要 |
<p>PROBLEM TO BE SOLVED: To manufacture a photocoupler capable of increasing the dielectric strength while avoiding cracking also cutting down the manufacture steps. SOLUTION: A light emitting element 14 and a photodetector 15 are coated with an optically transmissible transparent gel resin 18 for covering these elements 14, 15. Besides, a photoreflecting resin 19 is molded so as to cover the periphery of the gel resin 18 in the penetration of 45-65 (JIS-K2220). In such an arrangement, even if thermal stress is imposed between the photreflecting resin 19 and the gel resin 18, the transparent gel resin 18 itself is elastic-defermed to relieve the stress, so that the peeling between the photoreflecting resin 19 and the gel resin 18 on their interface in wide range may be avoided, thereby making no gap extending over the outer leads 12, 13 suppressing the deterioration in the dielectric strength. Besides, the thermal stress can be relieved by the mutability of the gel resin 18, thereby enabling the cracking in the photoreflecting resin 19 to be avoided.</p> |
