Laser device driven by a periodic waveform optimized for reducin

Details Laser device driven by a periodic waveform optimized for reducin Laser device driven by a periodic waveform optimized for reducin

1992-08-26

1994-05-17

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4432, 369116, 369107, G11B 700, G11B 712

Patent

active

053134486

ABSTRACT:
The optical information recording and reproducing method and apparatus include a method for controlling a high frequency pulse current for driving a semiconductor laser device by which noise due to returning laser light is hardly produced, and an apparatus for increasing access speed owing to decrease in the weight of an optical pick-up movable part. Loser noise is suppressed satisfactorily by detecting the position of the optical pick-up movable part in a split optical system by means of a scale, and generating a pulse current for modulating the laser having a frequency optimum for reducing the laser noise to drive the semiconductor laser device.

REFERENCES:
patent: 4150402 (1979-04-01), Tietze et al.
patent: 4480325 (1984-10-01), Aiki et al.
patent: 4712218 (1987-12-01), Ohnuki
patent: 4853923 (1989-08-01), Yamada et al.
patent: 5007039 (1991-04-01), Sakemoto et al.
patent: 5043965 (1991-08-01), Iida et al.
IEEE Spectrum, Aug. 1979, "Ten Billion Bits on a Disk", Bulthuis et al, pp. 26-33.
National Technical Report, vol. 35, No. 2, Apr. 1989; "CMF Actuator and High Speed Access System", Moriya et al, pp. 165-171.

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