Disc players

Details Disc players Disc players

1982-11-05

1985-09-03

Richardson, Robert L.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 59, 369133, 369240, 358342, G11B 1924

Patent

active

045396671

ABSTRACT:
A disc player for reproducing an information signal from a rotating disc having a spiral track on which a digital signal is recorded with a waveform obtained by the run length limited code modulation comprises a control circuit system wherein an interval representing the maximum or minimum run length in a reproduced signal from the disc is utilized for controlling the rotation of a motor for rotating the disc so as to keep the tangential velocity of the spiral track relative to a pickup device constant at predetermined speed and an additional control circuit system for detecting an interval of a constant level in the reproduced signal exceeding in length the interval representing the maximum run length obtained at the proper rotation of the disc, which appears when the reproduced signal from the disc is not properly obtained and therefore the motor is in danger of running away that is, being driven beyond a maximum speed by an ever-increasing energization voltage, and, when such an interval is detected, preventing the motor from running away, for example, by stopping the motor from rotating.

REFERENCES:
patent: 3662353 (1972-05-01), Chertok
patent: 4223349 (1980-09-01), Dakin et al.
patent: 4338683 (1982-07-01), Furukawa et al.

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