Photocoupler
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United States of America Patent
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-
May 31, 2016
Grant Date -
Jan 14, 2016
app pub date -
Sep 18, 2015
filing date -
Mar 14, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A photocoupler includes: a light emitting element; a light receiving element; an inner resin layer; and an outer resin layer. The light emitting element is driven by an input electrical signal. The light receiving element is configured to convert emission light of the light emitting element into an electrical signal. The inner resin layer includes a base resin and a curing agent. The base resin contains isocyanuric acid having an epoxy group. The curing agent contains an acid anhydride having an acid anhydride group. The inner resin layer covers the light emitting element and the light receiving element. Then outer resin layer encloses the inner resin layer and configured to block the emission light. Carbon atomic concentration increases and oxygen atomic concentration decreases with distance in depth direction of the inner resin layer from an interface.
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