Optical data retrieval system for multi- characteristic...

Details Optical data retrieval system for multi- characteristic... Optical data retrieval system for multi- characteristic...

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G11B 7/00 (2006.01) G11B 7/013 (2006.01) G11B 7/08 (2006.01) G11B 7/12 (2006.01) G11B 7/13 (2006.01) G11B 7/24 (2006.01) G11B 27/36 (2006.01) G11B 7/0033 (2006.01)

Patent

CA 1200609

Abstract A system for recovering data, both prerecorded and user data, from a reflective optical data storage medium, with the further capability of distinguishing data from foreign particulate matter on the data disk. A pair of detectors measures the fraction of light reflected from and trans- mitted through the data disk and, knowing the fraction of light absorbed by the disk, distinguishes user data from prerecorded data and particulate matter. The data disk has different optical characteristics for prerecorded and user data, the prerecorded information being black, highly absorptive silver, while the user data consists of pits of relatively high transmissivity in a reflective field. Particulate matter is recognized by intermediate reflectivity and transmissivity. The optical characteristics of the material are enhanced or exaggerated so that the two types of data and particulate matter can be distinguished.

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