Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1980-04-14
1982-12-07
Konick, Bernard
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 44, 369 45, 369 47, 369275, 360 722, 360 77, 358342, G11B 700, G11B 2108, G11B 2110
Patent
active
043631169
ABSTRACT:
Disclosed is a method and apparatus for recording information on a disc-shaped record carrier body with a single beam of radiation. The record carrier body is provided with a servo track which preferably exhibits a phase structure and which contains a multitude of sector addresses each associated with a portion provided with a radiation sensitive layer. Before the information is recorded, the beam is switched to a low, read level and the desired address is located. Simultaneously, the radial position and tangential speed of the radiation spot and the focusing of the radiation beam are checked. Once the desired address is located, the beam is switched to a higher, write intensity and the information is recorded on the radiation sensitive layer of the portion associated with that address. During recording, the radiation returning from the record carrier can be used to check whether the information is recorded correctly. During reading of the recorded information, the servo track may be used for positioning the radiation spot on the information track.
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Gerritsen Gerrit B.
Kleuters Wilhelm J.
Verboom Johannes J.
Briody Thomas A.
Faber Alan
Konick Bernard
Mayer Robert T.
Tamoshunas Algy
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