Composite optical grating for optical disk data storage systems
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United States of America Patent
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Jan 1, 1991
Grant Date -
N/A
app pub date -
Oct 3, 1988
filing date -
Oct 3, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The composite optical grating for optical disk data storage systems uses a first optical grating to generate three light beams disposed approximately on a straight line. A second optical grating in the composite optical grating is juxtaposed with the first optical grating and divides the three light beams into two images, each consisting of a three spot array. The first of these images is focused on a first data storage track while the second image of three spots is focused on a second adjacent data storage track. The three spot array formed on the first track is used in conventional fashion to read data from this data storage track. The center spot is used to read the data from the data storage track while the two outer linearly oriented spots are used for tracking purposes. The second image formed by the second optical grating is focused on a second adjacent data storage track and only the center spot of the three spot array is used to read data from the second data storage track. The adjacent outer spots in the second image are not used although they are available for use for tracking purposes.
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