Optical information recording and reproducing apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Apr 7, 1987
Grant Date -
N/A
app pub date -
Aug 9, 1984
filing date -
Aug 26, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an optical information recording and reproducing apparatus having a laser light source and an optical system so that a beam from the laser light source is irradiated through the optical system on an information recording medium to record and reproduce information, an accousto-optic modulator is disposed in the optical system for receiving the beam from the laser light source, and a modulation unit is provided which comprises an oscillator for generating a plurality of signals at different frequencies, a modulator for modulating the outputs of the oscillator and an adder for adding together the outputs of the modulator.
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