Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1979-12-31
1981-08-25
Eddleman, Alfred H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
G11B 2110, G11B 558, G11B 1700
Patent
active
042862965
ABSTRACT:
A servo system for centering a transducer over boundaries between adjacent servo tracks on a magnetic disk in which the servo tracks are each formed by alternate long and short magnetic segments, with the short segments in one track being centered with the long segments of adjacent tracks. The servo system includes a frequency doubler circuit for producing a uniform frequency square wave signal of double the fundamental frequency of the analog signal picked up by the transducer from the servo encoding, a filter connected with the transducer for producing an analog double frequency signal based on the analog signal from the transducer, a synchronous detector functioning as a multiplier for multiplying the double frequency square wave signal with the analog double frequency signal from the transducer, and a filter for averaging the resultant pulsating position error signal to provide a steady state position error signal for any particular position of the transducer over a pair of adjacent servo tracks. The steady state position error signal is applied to a servo control and servo actuator for moving the transducer until the steady state position error signal reaches zero which corresponds with the desired centered position of the transducer over the boundary between a pair of adjacent servo tracks.
REFERENCES:
patent: 3404392 (1968-10-01), Sordello
patent: 3534344 (1970-10-01), Santana
patent: 3893180 (1975-07-01), Braun et al.
patent: 3936876 (1976-02-01), Taylor
patent: 3959820 (1976-05-01), Braun
patent: 4038693 (1977-07-01), Huffine et al.
IBM Tech. Disc. Bull., C.N. Wallis, TRI-BIT Servo Pattern, vol. 16, No. 11, Apr. 1974, pp. 3757-3759.
Bleuer Keith T.
Eddleman Alfred H.
International Business Machines - Corporation
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