Optical medium having a data pattern for detecting an upside-dow

Details Optical medium having a data pattern for detecting an upside-dow Optical medium having a data pattern for detecting an upside-dow

1996-06-28

1997-12-02

Dinh, Tan

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369 58, G11B 724

Patent

active

056943873

ABSTRACT:
An optical medium comprises an information layer interposed between first and second transparent plates having about the same thicknesses. A light beam illuminates the information layer from a front side, or from a back side of the medium when the medium is inserted erroneously. Information is reproduced or recorded when the light beam illuminates the front side thereof. The information layer comprises a second area for recording a data pattern on which a direction of data arrangement can be easily determined, and a first area for recording main information. In order to determine which side of the disk is facing an optical head, the data pattern in the second area is reproduced, and the side can be determined according to a difference in direction of data arrangement in reproduced signals.

REFERENCES:
patent: 5084627 (1992-01-01), Ueki et al.
patent: 5235581 (1993-08-01), Miyagawa et al.

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