Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1992-12-24
1994-03-22
Dzierzynski, Paul M.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369124, 369 59, G11B 700
Patent
active
052971295
ABSTRACT:
Method and apparatus for improving the characteristics of the surface effects recorded on an optical disc, for use with an optical recording apparatus which includes a writing light beam source and an optical modulator for modulating the intensity of the writing beam of light above and below a threshold level of a moving recording medium in response to a modulator drive signal for recording information on the medium, the light beam being capable of forming a track of surface effects or indicia in the moving recording medium when the writing beam is above threshold and incapable of forming surface effects in the moving recording medium when the writing beam is below threshold. The method includes receiving a substantially rectangular waveform having leading and trailing edges, provided as a modulator drive signal to modulate the writing beam to a peak power above threshold and to a minimum power level below thresholds, respectively, and producing a shaped modulator drive signal by increasing the peak power of the writing beam responsive to the occurrence of the leading edges, by decreasing the time the shaped modulator drive signal is above threshold in order to maintain a prescribed duty cycle in the track of surface effects in the moving recording medium, and by producing symmetrical leading and trailing edges of the surface effects.
REFERENCES:
patent: 4225873 (1980-09-01), Winslow
patent: 4616356 (1986-10-01), Wilkinson et al.
patent: 4866692 (1989-09-01), Saito et al.
patent: 4961182 (1990-10-01), Saito et al.
patent: 5218591 (1993-06-01), Shimamoto et al.
Brown Stephen P.
Li Shigang
Wilkinson Richard L.
Dzierzynski Paul M.
Nguyen Kiet T.
Optical Disc Corporation
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