Track access control system in rotating disc devices with eccent

Details Track access control system in rotating disc devices with eccent Track access control system in rotating disc devices with eccent

1990-04-10

1992-11-10

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 4428, 369 4411, G11B 700

Patent

active

051630338

ABSTRACT:
A track access control system in a rotating disc storage device includes a data writing/reading head which is movable in a radial direction of a rotating disc; and an impinging beam moving mechanism which is mounted on the data writing/reading head, for moving am impinging position of the optical beam for the data writing/reading, on the data writing/reading head. A relative position of the impinging beam on the disc from an optimum position is detected. The position of the head is controlled in response to a low frequency component of the above detected deviation, and the operation of the impinging beam moving mechanism is controlled in response to a high frequency component of the above detected deviation, so that the deviation is reduced during a track servo operation. A waveform memorizing circuit records a waveform of the movement of the head during a track servo operation. A track jump control mechanism moves the head and the above relative position of the impinging beam, so that the position of the impinging beam moves to a requested track. During the track jump operation, control quantities to move the head and the above relative position of the impinging beam is modified by adding the above recorded data of the waveform memorizing circuit thereto, corresponding to a current rotation angle of the disc. Further, when an erasing beam outputting unit is mounted on the head, a displacement of an outputting position of the erasing beam on the head from a predetermined position, is memorized during a track servo operation, and is added in the above modification during the track jump operation.

REFERENCES:
patent: 4907214 (1990-03-01), Nagano et al.
patent: 4982393 (1991-01-01), Matsushita et al.
patent: 5034941 (1991-07-01), Kasai et al.
Nikkei Mechanical 1987, Jul. 13, pp. 66-79.
U.S. application, Ser. No. 299,018 (filed on Jan. 19, 1989).

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