Coherent light generators – Particular component circuitry – Controlling current or voltage to laser
Reexamination Certificate
2006-02-07
2006-02-07
Harvey, Minsun (Department: 2828)
Coherent light generators
Particular component circuitry
Controlling current or voltage to laser
C372S038100, C372S038010, C372S034000
Reexamination Certificate
active
06996145
ABSTRACT:
The invention provides a semiconductor laser module which can suppress overcurrent flowing into a thermo-module, wherein the thermo-module (5) carries out a heating action when a reverse current flows from lead pin (16f) through lead pin (16a), and contrarily carries out a cooling action when a current flows from the lead pin (16a) through the lead pin (16f). An overcurrent limiting means (20) is provided, which can suppress overcurrent flowing into the thermo-module (5) in its heating direction. The overcurrent limiting circuit (20) is provided with a bypass line (21), a resistor (22), and a diode (23). When a current flows in the heating direction, the diode (23) is turned on, whereby the current is shunted to the thermo-module (5) and bypass line (21) for flow, and accordingly, the overcurrent flowing into the thermo-module (5) can be effectively suppressed.
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Aikiyo Takeshi
Furuhashi Chihomi
Koseki Takashi
Harvey Minsun
Lacasse & Associates LLC
Rodriguez Armando
The Furukawa Electric Co. Ltd.
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