Spindle control apparatus for disk player

Details Spindle control apparatus for disk player Spindle control apparatus for disk player

1991-07-26

1993-06-15

McElheny, Jr., Donald

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 32, G11B 700

Patent

active

052205517

ABSTRACT:
A spindle control apparatuses for a disk player allows a quick search of recorded data on a disk carrying a plurality of types of data that should be read out at different reading velocities. A spindle servo loop is rendered open in response to a command and a normal rotational velocity of the disk necessary to read out recorded data at a specific address is computed. Then the disk's rotational velocity is accelerated or decelerated in a single step until it coincides with the designated rotational velocity and the servo loop is closed when these velocities coincide with each other. This allows quick and stable locking of the spindle servo loop during the searching period, so that the searching velocity is raised considerably.

REFERENCES:
patent: 4641294 (1987-02-01), Yoshimaru
patent: 4750055 (1988-06-01), Van Lier
patent: 4789975 (1988-12-01), Taniyama
patent: 4984227 (1991-01-01), Yoshimaru

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