Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1987-09-22
1989-09-05
Sikes, William L.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 43, 358489, G11B 1928
Patent
active
048645540
ABSTRACT:
A method and apparatus for scanning a rotating optical disc record carrier with a radiation beam which forms a scanning spot on the carrier and which is moved radially relative thereto. Pulses are generated at a frequency proportional to the angular velocity of the carrier, and clock pulses are generated at a constant frequency differing from and preferably higher than that of the velocity pulses. In response to each velocity pulse an accumulator is incremented by a first correction value (INC) and in response to each clock pulse the accumulator is decremented by a second correction value (DEC). The angular velocity of the record carrier is controlled to maintain a constant value of the average of the sum output of the accumulator over the intervals between successive velocity pulses, and the correction values are adjusted so that the ratio thereof is maintained proportional to the radial distance between the scanning spot and the axis of rotation of the carrier. Scanning is thereby accurately maintained at a constant linear scanning velocity.
REFERENCES:
patent: 4028732 (1977-06-01), Salter et al.
patent: 4200893 (1980-04-01), Matison
patent: 4371894 (1983-02-01), Gamras
patent: 4397011 (1983-08-01), Ogawa
patent: 4513406 (1985-04-01), Ishihara
patent: 4543650 (1985-09-01), Wachi
patent: 4603412 (1985-09-01), Yamazaki
Du Pau Cornelis P.
Hamer Rene H.
Eason Leroy
Sikes William L.
Tamoshunas Algy
U.S. Philips Corporation
Ullah Akm E.
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