Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1985-05-28
1986-12-30
Stellar, George G.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
G11B 556
Patent
active
046333444
ABSTRACT:
To avoid ambiguity in the tracking of a magnetic head to a data track, the invention calls for the selection of a single given signal polarity, as recorded, as the source of positional control for a tracking servo. Difference and sum signals associated with the two longitudinal halves of a data track constitute, respectively, the servo error signal and the data signal.
REFERENCES:
patent: 3246307 (1966-04-01), Stanley
patent: 3918091 (1975-11-01), Walraven et al.
patent: 4055849 (1977-10-01), Hickok
patent: 4164781 (1979-08-01), Brown
IBM Technical Disclosure Bulletin, vol. 19, No. 8, Jan. 1977, pp. 3228-3229, Data-Track-Following, Servo System, D. Martin.
IBM Technical Disclosure Bulletin, vol. 19, No. 9, Feb. 1977, pp. 3575-3576, AGC System for Dual-Element Magnetic Head Servo System, Granata et al.
IBM Technical Disclosure Bulletin, vol. 19, No. 11, Apr. 1977, pp. 4226-4227, On-Track-Data Servoing, Schneider et al.
IBM Technical Disclosure Bulletin, vol. 16, No. 6, Nov. 1973, pp. 1821-1823, Comstock et al., Triple-Layer Magnetic Recording Track Following Servo Concept with Alternating Single-Frequency Servo Tracks.
Eastman Kodak Company
Stellar George G.
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