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专利名称：Apparatus for reading record carriers having
substantially concentric or spiral tracks
发明人：Overath, Hilde Maria Alda,Hezemans,
Cornelius Antonius,Bakx, JohannesLeopoldus
申请号：EP88200633.1申请日：19880405公开号：EP0286179A1公开日：19881012
专利附图：
摘要：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 separatorcircuit (4) for extracting a periodic synchronising signal (Ps) from the information read. Bymeans of a servo system, which interalia includes a drive motor (9) for driving the disc 1and a control circuit (5), the rotational speed of the disc is controlled so as to maintainthe periodic synchronising signal (Ps) in synchronism with a reference signal (Pr). Thecircuit (9a) rejects those signal components in the control signal (U) for the motor (9)which are caused by an eccentric position of the centre of rotation of the disc relative tothe track pattern. This prevents these signal components from causing an unnecessarydissipation of electric power in the motor, yielding a substantial improvement in motorefficiency.
申请人：Philips Electronics N.V.
地址：Groenewoudseweg 1 5621 BA Eindhoven NL
国籍：NL
代理机构：Peters, Rudolf Johannes
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