Circuit and method for driving light-emitting element and...

Coherent light generators – Particular component circuitry – Controlling current or voltage to laser

Reexamination Certificate

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Details

C372S038100, C372S038010, C372S029011, C372S029015

Reexamination Certificate

active

07986720

ABSTRACT:
A circuit for driving a light-emitting element such as a laser diode LD has a boost circuit for boosting an input voltage to supply it to the light-emitting element, a photoreceptor such as a photodiode PD for monitoring light from the light-emitting element; and a boost control circuit for controlling a boost voltage of the boost circuit based on a monitored amount of the photoreceptor. In the method for driving a light-emitting element by boosting an input voltage to supply the voltage to the light-emitting element, light from the light-emitting element is monitored and its monitored amount is used as a basis to control a boost voltage to the light-emitting element. A control circuit may be provided to control a driving current that passes through the light-emitting element based on the monitored amount of the photoreceptor.

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