Optical data recording apparatus producing a laser beam having a

Details Optical data recording apparatus producing a laser beam having a Optical data recording apparatus producing a laser beam having a

1994-10-17

1999-11-09

Dinh, Tan

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

G11B 724

Patent

active

059827394

ABSTRACT:
In an optical data recording media provided with a recording layer which changes its optical characteristics by the difference of heat history of heating and cooling by the irradiation of the laser light to a transparent substrate on which tracking channels have been formed. The width of an extruded or concave region formed by the tracking channels on the substrate is narrower than the diameter of the laser beam being used for recording, erasing and reading. Thereby, a problem which is associated with the recording frequency-dependent erasing efficiency in a case where the pulse width modulation method is used as the modulation method, can be solved.

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Japanese Patent Abstract 3-241530 (A), vol. 16, No. 32 (P-1303), Oct. 28, 1991.
Japanese Patent Abstract 61-156532 (A), vol. 10, No. 361 (P-523), Jul. 16, 1986.

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