Dynamic information storage or retrieval – Dynamic mechanism subsystem – Mechanism condition or storage medium responsive control
Patent
1988-05-23
1991-05-28
Levy, Stuart S.
Dynamic information storage or retrieval
Dynamic mechanism subsystem
Mechanism condition or storage medium responsive control
369 32, 369233, G11B 1924, G11B 1722
Patent
active
050200470
ABSTRACT:
A method and device are revealed for scanning a radiation-sensitive layer (2) of a rotating carrier (4) with a constant linear velocity by means of a radiation beam (5) which is directed towards the carrier (4) by an optical system (6) which is radially movable relative to the carrier (4). A velocity-pulse generator (10) generates clock pulses (Ps) of a frequency (fs) proportional to the angular velocity of the carrier (4). A clock generator (25) generates clock pulses (Pk) of constant frequency (fk). In response to every clock pulse (Pk) a sum value (Sw) is corrected by a first correction value (DEC). In response to every velocity pulse (Ps) the sum value is corrected by a second correction value (INC) having a sign opposite to that of the first correction value. The angular velocity (W) of the record carrier is controlled to a value for which the average of the sum value (Sw) remains constant. The ratio between the second (INC) and first correction value (DEC) is maintained at a value which is proportional to the distance (Xr) between the point of incidence of the radiation beam (5) on the carrier and the center of rotation. Thus, scanning is effected with a constant linear scanning velocity.
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DuPau Cornelis P.
Hamer Rene H.
Eason Leroy
Levy Stuart S.
U.S. Philips Corporation
Wells Kenneth B.
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