Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1990-07-26
1993-06-01
Chin, Tommy P.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369111, G11B 700
Patent
active
052166589
ABSTRACT:
An apparatus and method for erasing data from optical media in dual beam systems. The erase spot is focused to have a diameter equal to three times the track pitch of the medium. The larger erase spot eases spot alignment requirements since even beam misalignments of half a track width still supply enough energy to the medium to erase the data bump. The larger erase spot heats a larger area more gradually than a single track width erase beam and thereby also enables a more complete erasure of the medium.
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Michael B. Martin et al., USSN 152, 696, filed Feb. 5, 1988, entitled "Bulk Eraser for Optical Memory Media".
Der-Chang Hsieh, USSN 459,923, filed Jan. 2, 1990, entitled "System and Method for Erasing Light-Responsive Optical Disks".
Chin Tommy P.
Tandy Corporation
Tran Thai
LandOfFree
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