Coherent light generators – Particular component circuitry – Optical pumping
Patent
1987-01-20
1988-06-28
Scott, Jr., Leon
Coherent light generators
Particular component circuitry
Optical pumping
372 29, H01S 300
Patent
active
047544600
ABSTRACT:
A drive circuit for a semiconductor laser in an apparatus for recording/playback of data utilizing an optical recording medium includes circuit elements for establishing recording and playback operating conditions respectively in which output light levels from the laser are set to suitable values for recording and playback, and for controlling the laser output light levels during recording and playback operation at fixed values, and moreover for modulating the laser output light in accordance with a recording signal during recording operation. A changeover control signal which executes changeover between the recording and playback conditions is derived such as to begin in coincidence with the start of a leading pulse of a series of recording signal pulses, and to end immediately following the final recording signal pulse, to thereby avoid excessive laser drive current levels following changeover between playback and recording operating conditions.
REFERENCES:
patent: 4114180 (1978-09-01), Kayanuma
patent: 4516242 (1985-05-01), Yokota
Kimura Mari
Koishi Kenji
Matsuo Tamotsu
Jr. Leon Scott
Matsushita Electric - Industrial Co., Ltd.
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