Apparatus for rapidly accessing a large data base employing an optical disc reading system with multiple heads and track position compensation means
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United States of America Patent
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Oct 3, 1989
Grant Date -
N/A
app pub date -
Jul 31, 1987
filing date -
Jul 31, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An OCR reads the name and address on sequentially conveyed mail. An index number is derived for each name and address for correlating that name and address to r-.theta. coordinates of file tracks on a CD-ROM disc which is rotated at constant velocity. The index number is derived from the read address to identify the CD-ROM disc containing the desired data and the track containing a nine or eleven-digit zip code for that read address. Four read heads on each of multiple CD-ROM players are used to access the data based on head availability. The read head controllers have updated r-.theta. and clocking data for accurately locating a track regardless disc manufacturing and thermal variations and for reading data from any track at substantially the same data rate. A bar code containing a nine or eleven digit zip code, as applicable, is printed on the read letter for later automatic sorting by zip code.
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