Optical information reproducing apparatus having improved laser

Details Optical information reproducing apparatus having improved laser Optical information reproducing apparatus having improved laser

1993-08-05

1995-01-31

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 60, G11B 7125

Patent

active

053864093

ABSTRACT:
A laser driver outputs a drive current. A high frequency current generated by a HF current generator is superimposed to the drive current via a coupling capacitor. A laser diode is driven by the high-frequency-current superimposed drive current. This superimposed drive current has a period for performing a laser oscillation at the laser diode and a period for stopping the laser oscillation. The laser light is reflected at the surface of an optical disk and returned to the laser diode. When the reflected laser light is returned to the laser diode, the laser diode is in the laser oscillation stopping period of the superimposed drive current.

REFERENCES:
patent: 4480325 (1984-10-01), Aiki et al.
patent: 4787078 (1988-11-01), Yokogawa
patent: 5107473 (1992-04-01), Fuji et al.

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