Laser beam modulation apparatus

Details Laser beam modulation apparatus Laser beam modulation apparatus

1995-09-05

1997-01-07

Chin, Wellington

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359181, 359107, 369116, H04B 1004

Patent

active

055923224

ABSTRACT:
A laser beam modulation apparatus modulates a EFM (eight-fourteen modulated) signal to generate as a laser power control signal a pulse modulated EFM signal (PM-EFM). During each of on-time intervals of the EFM signal, the pulse modulated EFM signal serves to apply the laser beam on a recording area on a phase-change disk and to undulate the laser beam in order to prevent an overheating of the recording area.

REFERENCES:
patent: 4709417 (1987-09-01), Kuwabara
patent: 5291470 (1994-03-01), Nishiuchi

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