Optical system for simultaneous reading of multiple data tracks
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United States of America Patent
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Jan 14, 1992
Grant Date -
N/A
app pub date -
Sep 24, 1990
filing date -
Sep 24, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical system for reading and tracking multiple tracks of optically recorded data consists of a combination of spherical and cylindrical lenses shaping the emission of a laser diode into a narrow line on the surface of the recorded material. This line is subsequently imaged on a detector array containing multiple detectors for each data track being read. Digital signal processing identifies the tracks and follows them by selecting the proper detectors in the detector array. Track-to-track interference is minimized by selecting the numerical aperture of the final lens to have the nulls of the Airy pattern at double the track spacing.
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