Apparatus for braking a spindle motor in a disc playback system

Details Apparatus for braking a spindle motor in a disc playback system Apparatus for braking a spindle motor in a disc playback system

1991-11-01

1998-02-03

Huber, P. W.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 53, 360 741, G11B 509, G11B 1548

Patent

active

057151571

ABSTRACT:
A disc playback system monitors coded information in the tracks of discs being played back in order to determine the radial position of the information pickup apparatus. Responsive to a disc stop command, the radial position is utilized to determine the angular speed of the disc, and thereby the speed of the motor that is rotating the disc. A time period, necessary for a predetermined signal which accelerates the motor in the reverse direction to stop the rotation of the disc, is calculated in response to the angular speed at the time the stop command is instituted. Thereafter the predetermined reversing signal is applied to the motor for the calculated period to stop the rotation of the disc.

REFERENCES:
patent: 4439849 (1984-03-01), Nabeshima
patent: 4460857 (1984-07-01), Michaelis
patent: 4672595 (1987-06-01), Senso
patent: 4675855 (1987-06-01), Iso et al.
patent: 4727530 (1988-02-01), Tomisawa
patent: 4751693 (1988-06-01), Yoshimaru
patent: 4831469 (1989-05-01), Hanson et al.
patent: 4979048 (1990-12-01), Shimada et al.
patent: 5056076 (1991-10-01), Tsuji et al.

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