| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a small-sized photocoupler which is inexpensive and has high light transfer efficiency. SOLUTION: The photocoupler having a light emitting element and light receiving elements optically coupled with each other has the light emitting element provided on an insulating layer formed on a semiconductor substrate and the Light receiving elements formed on the semiconductor substrates while surrounding the light emitting element.</p> |
