Preheating beams for optical recording
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United States of America Patent
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May 28, 2002
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N/A
app pub date -
Aug 30, 2000
filing date -
Aug 30, 2000
priority date (Note) -
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Abstract
A method for optical data recording includes focusing a preheat laser beam and a recording laser beam onto an optical recording medium, forming a preheat focused spot and a recording focused spot having nearly equal sizes; providing relative scanning motion between the optical recording medium and the recording focused spot in a direction parallel to the displacement from the preheat focused spot to the recording focused spot at a velocity sufficient to prevent thermal diffusion from the optical recording medium during the transit of the medium from the preheat focused spot to the recording focused spot; and modulating the preheat laser beam according to a modulated data signal, thereby creating preheated zones on the media surface with temperatures less than a threshold for complete mark formation. The method also includes modulating the recording laser beam according to the modulated data signal, with a time delay equal to the separation between the preheat focused spot and the recording focused spot divided by the scanning velocity, and causing the recording laser beam to illuminate the recording focused spot with sufficient power to raise the temperatures of each preheated zone above the threshold for complete mark formation, creating a track of permanent recorded marks.
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