Semiconductor laser driving circuit, light emitting device,...

Details Semiconductor laser driving circuit, light emitting device,... Semiconductor laser driving circuit, light emitting device,...

2008-05-13

2008-05-13

Rodriguez, Armando (Department: 2828)

Coherent light generators

Particular component circuitry

Controlling current or voltage to laser

C372S034000, C372S038020

Reexamination Certificate

active

11560977

ABSTRACT:
A semiconductor laser driving circuit has a circuit protection function at low temperature and includes a voltage current converter that converts an input voltage Vin, which is determined according to a desired light brightness of the semiconductor laser to be driven, into a current. A current limiter limits an output current of the voltage current converter to a specified current value or less. An output amplifier amplifies the output current of the voltage current converter and supplies the amplified current as a drive current to the semiconductor laser. A temperature detection circuit detects a low temperature state and, in the low temperature state, decreases the specified current value of the current limiter.

REFERENCES:
patent: 63-29968 (1988-02-01), None
patent: 05-259544 (1993-10-01), None

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