Cutting apparatus for an optical disc

Details Cutting apparatus for an optical disc Cutting apparatus for an optical disc

1990-08-23

1992-01-28

Richardson, Robert L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369111, 369278, 369109, G11B 700, G11B 370

Patent

active

050848569

ABSTRACT:
A cutting apparatus is provided, in which a recording laser beam from a laser light source is ON/OFF-modulated by an optical modulating device on the basis of a square output signal in which a video FM wave signal is pulse width modulated by an audio FM wave signal thereby to form exposure pits on a master disc. This cutting apparatus includes a photodetector for receiving one portion of the recording laser beam irradiated on the master disc from the laser light source or a photodetector for receiving a reflected light of the recording laser beam irradiated on the master disc from the laser light source and which is reflected on the master disc. A detected output signal from the photodetector is supplied through a low-pass filter to a control circuit which controls an intensity of an output laser beam from the laser light source, and an offset of a source system line is adjusted so that a secondary higher harmonic component of a main carrier in the detected output from the photodetector is minimized.

REFERENCES:
patent: 4114180 (1978-09-01), Kayanuma
patent: 4516235 (1985-05-01), Tarzaiski
patent: 4562567 (1985-12-01), Frankfort et al.
patent: 4692606 (1987-09-01), Salca et al.
patent: 4759007 (1988-07-01), Eboly
patent: 4807214 (1989-02-01), Getseuer
patent: 4949331 (1990-08-01), Maeda et al.

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