PURPOSE: To eliminate the leakage of the light emitted from a light emitting element except the operating circuit by filling opaque resin (black resin) on the top of a wall isolating a photocoupler.
CONSTITUTION: After a transparent resin 14 is injected in recesses 3, 4, opaque resin of semi-fused state which does not pass the light such as black resin 15 is immediately filled and adhered as a shield to the top of the wall 2 for isolating the recesses 3, 4. Even if a current is flowed to a light emitting element 5 to allow the element 5 to emit the light, the light is emitted only to a photodetector 7, and the light transmitted from the top of the wall 2 is shielded, but is not transmitted to the recess 4 of the adjacent second photocoupler like the conventional photosemiconductor device. Accordingly, it does not increase the leakage current of the photodetector of the other adjacent photocoupler nor erroneously operates the photocoupler.
| JPS61265878 | OPTICAL MODULATION TYPE DETECTING DEVICE |
| JP2002314189 | OPTICAL TRANSMISSION DEVICE |
HIRAGA KOUJIROU
TOTSUKA NORIO
OOTA YUTAKA
| JPS53123690A | 1978-10-28 | |||
| JPS5185387A | 1976-07-26 | |||
| JPS54890A | 1979-01-06 |
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