Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1991-12-09
1993-07-13
Dixon, Joseph L.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7706, 318685, G11B 5596
Patent
active
052279316
ABSTRACT:
A head driving device includes a head driving mechanism which is arranged to shift, relative to a recording track formed on a recording medium, a head stepwise in units of a predetermined driving extent, a detection circuit which detects the level of a signal reproduced by the head, and a control circuit which controls the head driving mechanism to have the head shifted in the direction of obtaining the maximum output of the detection circuit. When the head shifting direction is reversed, the control circuit causes the head to be shifted in the reverse direction at least by two steps in units of the driving extent and determines the stopping position of the head on the basis of the output of the detection circuit obtained at each of head positions obtained at each step of shifting the head in the reverse direction.
REFERENCES:
patent: 4313141 (1982-01-01), Yanigida et al.
patent: 4437049 (1984-03-01), Tullos et al.
patent: 4490662 (1984-12-01), Moribe et al.
patent: 4689700 (1987-08-01), Miyake et al.
patent: 4710832 (1987-12-01), Itoh
patent: 4729040 (1988-03-01), Miyake
Canon Kabushiki Kaisha
Dixon Joseph L.
Robertson David L.
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