Excessive current input suppressing semiconductor laser light emitting circuit
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United States of America Patent
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Apr 15, 2008
Grant Date -
Jun 23, 2005
app pub date -
Oct 25, 2004
filing date -
Oct 27, 2003
priority date (Note) -
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Abstract
A semiconductor laser light emitting circuit includes a semiconductor laser diode emitting a laser light by modulating a current supplied thereto, a light intensity detection circuit that detects the laser light and generates a voltage, and a voltage-current conversion circuit converting a voltage into a current supplied to the laser diode. A S/H capacitance is provided to store electric charge and output a voltage to the voltage/current conversion circuit. A first operational amplifier is provided to output a first current charging the S/H capacitance. A rapidly charging circuit is provided to charge the S/H capacitance with a second current. The rapidly charging circuit terminates charging when the voltage is equal to or more than a second reference voltage.
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