Waveform shaping method and apparatus for optical recording

Details Waveform shaping method and apparatus for optical recording Waveform shaping method and apparatus for optical recording

G - Physics

11

B

G11B 7/00 (2006.01) G11B 7/0045 (2006.01) G11B 7/125 (2006.01)

Patent

CA 2152590

Method and apparatus for improving the characteristics of the surface effects recorded on an optical disc, including 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 is capable of forming a track of surface effects in the moving recording medium when the writing beam is above threshold and incapable of forming surface effects when the writing beam is below threshold. A rectangular waveform, having leading and trailing edges, modulates the writing beam to a peak power above a threshold and to a minimum power level below a threshold, in order to maintain a prescribed duty cycle in the track of surface effects in the moving recording medium.

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