Spindle servo system for magneto-optical recording/playback appa

Details Spindle servo system for magneto-optical recording/playback appa Spindle servo system for magneto-optical recording/playback appa

1991-07-10

1993-06-29

Psitos, Aristotelis

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 47, 369 54, 369 4411, G11B 700

Patent

active

052240860

ABSTRACT:
A spindle servo system for a magneto-optical recording/playback apparatus, comprising a PLL circuit lockable in phase by sample servo pits formed on a track of a magneto-optical disc; a phase comparator for comparing the phase of a signal, whose period corresponds to the output of the PLL circuit, with the phase of a reference frequency signal; and a resonator having a reference frequency conforming to the eccentricity cycle of the disc. In this servo system, the rotation period of a spindle motor for driving the disc is controlled in accordance with the output of the phase comparator and the output of the resonator. The PLL circuit includes a voltage-controlled crystal oscillator, and the resonator is excited in conformity to the output of the phase comparator to control the rotation frequency of the spindle motor, thereby reducing the jitter component included in the output of the PLL circuit.

REFERENCES:
patent: 4823203 (1989-04-01), Narusawa
patent: 5056075 (1991-10-01), Maruta et al.
patent: 5058089 (1991-10-01), Yoshimaru et al.
patent: 5062091 (1991-10-01), Maeda et al.

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