Photocoupler and light emitting element

摘要

According to one embodiment, a photocoupler includes: an input terminal; a light emitting unit; a light receiving unit and an output terminal. An input electrical signal having a prescribed voltage is input into an input terminal. The light emitting unit is connected to the input terminal, includes a light emitting element configured to emit emission light, and is configured to drive the light emitting element under a constant voltage of the input electrical signal. The light receiving unit includes a light receiving element configured to receive the emission light and convert the emission light into an electrical signal. The output terminal is insulated from the input terminal and configured to output the electrical signal in accordance with the input electrical signal.

主权项

1. A photocoupler comprising:
an input terminal to which an input electrical signal having a prescribed voltage is input; a light emitting unit connected to the input terminal, including a light emitting element configured to emit emission light, the light emitting unit being formed on a substrate; a light receiving unit including a light receiving element configured to receive the emission light and convert the emission light into an electrical signal; and an output terminal insulated from the input terminal and configured to output the electrical signal in accordance with the input electrical signal, wherein the light emitting unit comprises a bonding layer between the substrate and the light emitting element, the light emitting element comprising a light emitting layer formed between layers having opposite conductivity and the bonding layer is a metal layer, and a resistance layer is provided in the substrate so that a part of the substrate comprises the resistance layer, such that a constant voltage of the input electrical signal drives the light emitting element, wherein the resistance layer comprises a semiconductor material and has a resistivity between 10 Ω·cm and 100 Ω·cm.