Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1994-03-02
1997-04-22
Tran, Thai Q.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
3692752, 369 53, G11B 700, G11B 724, G11B 390
Patent
active
056234724
ABSTRACT:
An apparatus and method for recording an information signal on a record carrier by means of a radiation beam which produces optically detectable marks in parallel track portions thereon having a substantially constant track pitch (q). The write intensity of the radiation beam is adjusted to an optimum level which results in a width (p) of the optical marks which corresponds to the track pitch (q). The optimum intensity level is determined by recording different test signals in adjoining track portions at various write intensities of the radiation beam, reading-out the recorded test signals, and detecting therefrom the write intensity at which signal components of one test signal no longer occur in another recorded test signal. Recording at the optimum write intensity results in a minimum block error rate (BLER) upon read-out of the recorded information signal.
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Bakx Johannes L.
Horikx Jeroen J. L.
Chevalier Robert
Philips and Du Pont Optical Co.
Tran Thai Q.
U.S. Philips Corp.
Weiss Richard A.
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