Optical storage device made thinner by substituting electrical m

Details Optical storage device made thinner by substituting electrical m Optical storage device made thinner by substituting electrical m

1997-10-28

1999-10-12

Huber, Paul W.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 58, G11B 1722

Patent

active

059663537

ABSTRACT:
There is provided an optical storage device that can position a lens carriage and objective lens even when position sensors for the lens carriage and objective lens are excluded in an effort to make an optical disk unit thinner. In the optical storage device, immediately after an optical disk is loaded in a main body, the cutoff frequency of a filter lying on a path of a reproduction signal is temporarily changed to a lower frequency. A spacing of sectors of the optical disk is detected using a signal sent from the filter. A type of an optical storage medium and a position of a current reproduction track are detected on the basis of the detected sector spacing and data stored in a memory.

REFERENCES:
patent: 4744069 (1988-05-01), Sugiyama et al.
patent: 5077716 (1991-12-01), Takeda et al.
patent: 5146440 (1992-09-01), Yamaguchi et al.
patent: 5528568 (1996-06-01), Nakane et al.
patent: 5577009 (1996-11-01), Takamine

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