Light emitting element device including light emitting thyristor and optical print head including the light emitting element device
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United States of America Patent
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Jun 25, 2019
Grant Date -
Aug 3, 2017
app pub date -
Jan 27, 2017
filing date -
Jan 29, 2016
priority date (Note) -
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Abstract
A light emitting element device includes: a light emitting thyristor having a layered structure including a first semiconductor layer of a first conductivity type, a second semiconductor layer of a second conductivity type different from the first conductivity type, a third semiconductor layer of the first conductivity type, and a fourth semiconductor layer of the second conductivity type that are layered in this order; and a gate electrode for supplying gate current to the light emitting thyristor. The light emitting thyristor includes an etching stop layer disposed on a surface of the third semiconductor layer or included in the third semiconductor layer, the etching stop layer being a semiconductor layer having an etching rate lower than an etching rate of a semiconductor layer adjacent to the etching stop layer.
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