Driver circuit for semiconductor light-emitting device

Details Driver circuit for semiconductor light-emitting device Driver circuit for semiconductor light-emitting device

1989-01-05

1990-02-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

G01J 132

Patent

active

049009125

ABSTRACT:
A driver circuit for driving a semiconductor light-emitting device such as a semiconductor laser includes a voltage-controlling amplifier for controlling a light-emitting current which enables the semiconductor light-emitting device to emit light. The output voltage of the voltage-controlling amplifier is dependent on a light-quantity command voltage signal applied thereto. Since the light-emitting current can be directly varied by the voltage-controlling amplifier, the quantity of the emitted light can vary with a sufficiently fast response to follow the light-quantity command signal. The quantity of the emitted light is maintained at the level of the light-quantity command signal under feedback control by a current-controlling amplifier.

REFERENCES:
patent: 4686425 (1987-08-01), Havel
patent: 4712000 (1987-12-01), Yoshikawa et al.
patent: 4743749 (1988-05-01), Grundy

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