Optical pickup control apparatus

Details Optical pickup control apparatus Optical pickup control apparatus

1994-10-14

1996-06-04

Epps, Georgia Y.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 47, 369 54, 369 58, 369 50, G11B 700

Patent

active

055239889

ABSTRACT:
An optical disc apparatus includes a rotary encoder (14) for detecting a rotation of a spindle motor (12) that rotates an optical disc (11). A counter (16) generates a timing pulse (P.sub.3) per rotation of the optical disc (11) in synchronism with an output timing pulse (P.sub.1) of the rotary encoder (14). When the timing pulse (P.sub.3) is generated, in other words, one revolution of the optical disc (11) is specified, an optical pickup (21) is returned by one track amount in an inner peripheral direction (Ri) of the optical disc (11) in synchronism therewith. Therefore, even when an optical disc is an optical disc having tracks in which a length of one track is made different from a length of physical one round, the optical pickup (21) can be maintained in a still condition (also called on-track condition).

REFERENCES:
patent: 4057832 (1977-01-01), Kappert
patent: 4425587 (1984-01-01), Kurata
patent: 4439791 (1984-03-01), Hirata
patent: 4510531 (1985-04-01), Sugiyama
patent: 4638376 (1987-01-01), Sugiyama et al.
patent: 4833664 (1989-05-01), Shiragami et al.
Patent Abstracts of Japan vol. 010 No. 035 (E-380), 12 Feb. 1986 & JP-A-60 191595 (Nippon Hoso Kyokai; Others: 01) 30 Sep. 1985.
Patent Abstracts of Japan vol. 006 192 (P-145), 30 Sep. 1982 & JP-A-57 103165 2 (Pioneer Electronic Corp; Others: 01) 26 Jun. 1982.

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