Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1988-04-27
1990-08-14
Canney, Vincent P.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369100, 369121, 3692751, G11B 7013
Patent
active
049493299
ABSTRACT:
Provided is a process for the erasure of information recorded in an optical information medium. The erasure is effected by irradiating the medium with a laser beam, with the duty cycle, laser power and focus offset having been adjusted from that used during writing such that upon the irradiation complete and clean erasure of the information is effected. It is preferred that the focus offset and laser power are adjusted the minimal amount possible and that the duty cycle is the parameter of the three for which the greatest adjustment is made. Control and adjustment of the three parameters in accordance with the present invention permits one to realize more accurate, efficient and clean erasure, even bit-by-bit erasure if desired, than has heretofore been possible.
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Japanese Journal of Applied Physics, vol. 22, No. 2, Feb., 1983, pp. 340-343.
Furman Steven R.
Kuder James E.
Canney Vincent P.
Hoechst Celanese Corp.
Young W. R.
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