Positioning servomechanisms

Details Positioning servomechanisms Positioning servomechanisms

1983-11-14

1986-05-20

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 77, G11B 2102

Patent

active

045905274

ABSTRACT:
A positioning system, suitable for positioning a head adjacently to data tracks on a rotating magnetic data storage disc and employing a polyphase optical position detente transducer, overcomes positioning inaccuracies associated with the relative spacing between the polyphase position indicating signals by measuring the span of all the phases in terms of demand to produce head movement applied to a D/A convertor, calculating the ideal stopping positions, and applying the inverse error demand through the convertor when positioning the head.

REFERENCES:
patent: 4039826 (1977-08-01), Wingate
patent: 4355273 (1982-10-01), DuVall
patent: 4480279 (1984-10-01), Hashimoto
patent: 4481613 (1984-11-01), Yokota
IEEE Transactions on Magnetics, vol. MAG-13, No. 3, May 1977, pp. 982-988, Magnetooptical Memory Experiments on a Rotating Mn-Cu-Bi Disk Medium, K. Chida et al.

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