Semiconductor laser driving circuit, and optical disc device...

Details Semiconductor laser driving circuit, and optical disc device... Semiconductor laser driving circuit, and optical disc device...

2006-06-14

2011-10-11

Park, Kinam (Department: 2828)

Coherent light generators

Particular component circuitry

Controlling current or voltage to laser

C372S038020, C372S038010, C372S038100

Reexamination Certificate

active

08036254

ABSTRACT:
The output voltage of a cathode drive-type semiconductor laser driving circuit is set to a minimum, power consumption by a driving circuit portion is suppressed, and the heat that is generated by the optical head or the optical disc device is reduced. In addition to a conventional configuration, the semiconductor laser driving circuit of the invention measures the cathode voltage (Vout) of a semiconductor laser (1) and controls the anode voltage (Vld) such that the cathode voltage (Vout) becomes a predetermined level, and by doing so sets the output voltage of the semiconductor laser driving circuit to a predetermined level in order to curtail power consumption by the driving circuit and minimize the rise in temperature of the optical head or the optical disc device.

REFERENCES:
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International Search Report issued Sep. 12, 2006 in the International (PCT) Application No. PCT/JP2006/311913.

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