Apparatus for reading record carriers having substantially conce

Details Apparatus for reading record carriers having substantially conce Apparatus for reading record carriers having substantially conce

1987-09-09

1989-04-04

McElheny, Jr., Donald

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

358338, 358342, G11B 1924, H04N 576

Patent

active

048192210

ABSTRACT:
A read apparatus for reading a record carrier (1) having a concentric track pattern comprises a scanning device (2, 3) for reading the information, and a separator circuit (4) for extracting a periodic synchronizing signal (Ps) from the information read. By means of a servo system, which inter alia includes a drive motor (9) for driving the disc 1 and a control circuit (5), the rotational speed of the disc is controlled so as to maintain the periodic synchronizing signal (Ps) in synchronism with a reference signal (Pr). The circuit (9a) rejects those signal components in the control signal (U) for the motor (9) which are caused by an eccentric position of the center of rotation of the disc relative to the track pattern. This prevents these signal components from causing an unnecessary dissipation of electric power in the motor, yielding a substantial improvement in motor efficiency.

REFERENCES:
patent: 4123779 (1978-10-01), Goldschmidt
patent: 4313191 (1982-01-01), Winslow et al.
patent: 4439849 (1984-03-01), Nabeshima
patent: 4481615 (1984-11-01), Hioki
patent: 4623939 (1986-11-01), Machida et al.
patent: 4672595 (1987-06-01), Senso
patent: 4710825 (1987-12-01), Okita et al.

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