Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1978-05-30
1980-02-12
Wolff, John H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 48, G11B 2110
Patent
active
041886461
ABSTRACT:
A servo system for accurately positioning a transducer relative to data paths on a recording medium by detecting sync and servo signals from two parallel abutting servo tracks sharing a common longitudinal boundary within circumferentially spaced sectors of the medium. Within each sector of the recording medium, two servo waveforms of different frequencies in two abutting servo tracks are preceded by a sync reference waveform of the same frequency in both servo tracks which is used as a reference for a phase locked oscillator, connected to the transducer, generating a pair of modulation signals that are to be mixed with transducer signals from both servo waveforms. A pair of servo channels are provided for receiving the pair of modulation signals and the servo signals for deriving an imbalance error signal representing deviation of the transducer from the center line of a data path, which is the projection from the sectors of the common longitudinal boundary between servo tracks. The imbalance error signal is used to center the transducer on the data path.
REFERENCES:
patent: 3691543 (1972-09-01), Mueller
patent: 3787815 (1974-01-01), Farr
patent: 3801969 (1974-04-01), Sordello
patent: 3810234 (1974-05-01), Monett
patent: 3864740 (1975-02-01), Sordello
patent: 3864741 (1975-02-01), Schwarz
patent: 4027338 (1977-05-01), Kril
patent: 4032984 (1977-06-01), Kaser et al.
patent: 4048660 (1977-09-01), Dennison
patent: 4087843 (1978-05-01), Louis
Darrah Edward R.
Sordello Frank J.
Touchton James J.
Battjer Eugene T.
Cleaver William E.
Schneck, Jr. Thomas
Sperry Rand Corporation
Wolff John H.
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