Optical encoder
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United States of America Patent
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Nov 11, 2008
Grant Date -
Sep 27, 2007
app pub date -
Jun 4, 2007
filing date -
Jan 7, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical encoder includes a code strip having a first side, a second side, a first track comprising indicia thereon, and a second track comprising indicia thereon. The code strip is moveable along a displacement path with respect to the optical encoder. A light source positioned on the first side of the code strip directs light toward the code strip. A first detector element is positioned on the second side of the code strip and is generally aligned with the first track of the code strip. A second detector element is positioned on the second side of the code strip and is generally aligned with the second track of the code strip. The second detector element is also positioned so that the second detector element is located a spaced distance along the displacement path from the first detector element.
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