System and method for erasing light-responsive optical disks

Details System and method for erasing light-responsive optical disks System and method for erasing light-responsive optical disks

1990-01-02

1991-10-08

Richardson, Robert L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

360 66, 3692752, 346 76L, 365106, G11B 700

Patent

active

050560816

ABSTRACT:
A system and method for erasing data on an optical storage disk of the type which is responsive to light of first selected characteristics to produce a detectable physical change in the disk and is further responsive to light of second selected characteristics to reverse the physical change. Erasure is effected by rotating the disk proximate a linear light source capable of projecting a curtain of light having said second selective characteristics onto the disk. Uniform erasure of the data may be obtained by modifying the light flux which is delivered to the disk as a function of distance from the center of the disk. In particular, by increasing the flux or flux density which strikes the disk proximate its periphery relative to that which strikes near the center, the unit dosage received by any portion of the disk may be equalized.

REFERENCES:
patent: 4719615 (1988-01-01), Feyrer et al.
patent: 4805043 (1989-02-01), Doyle

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