Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1985-03-29
1986-09-16
Cardillo, Raymond F.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
318685, 318696, 360 77, G11B 2108, H02K 2904
Patent
active
046125884
ABSTRACT:
A head moving apparatus using a stepping motor which comprises a reversible stepping motor for moving a head and a motor drive control apparatus for driving the stepping motor in alternate forward and reverse directions through switching of excitation phases of the motor after the motor has been driven in one direction, thereby eliminating errors of the step position of the stepping motor due to a hysteresis characteristic thereof. The head thus can be stopped at the same position irrespective of whether it is accessed in the forward or reverse direction.
REFERENCES:
patent: 4356522 (1982-10-01), Takano et al.
patent: 4423447 (1983-12-01), Nishida et al.
patent: 4437049 (1984-03-01), Tullos et al.
patent: 4489259 (1984-12-01), White et al.
patent: 4490662 (1984-12-01), Moribe et al.
Cardillo Raymond F.
Eslinger Lewis H.
Garland Steven R.
Sinderbrand Alvin
Sony Corporation
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