Detector array for optical encoders
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United States of America Patent
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Apr 3, 2007
Grant Date -
Mar 2, 2006
app pub date -
Aug 26, 2004
filing date -
Aug 26, 2004
priority date (Note) -
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Abstract
A photodiode detector array for optical encoders includes a plurality of photodiodes, each of the photodiodes providing a scanning signal with a defined phase relationship to a scale when the detector array moves relative to the scale. A plurality of switching elements is provided for selectively combining each of the photodiodes with other photo diodes in a defined manner. The switching elements allow the photodiodes to be unambiguously combined for at least two different scale radii so that a defined number of phase shifted scanning signals is generated in each case. The combination of the photodiodes differs between the at least two different scale radii.
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