Optical reflective encoder with multi-faceted flat-faced lens
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United States of America Patent
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Jul 5, 2016
Grant Date -
May 3, 2012
app pub date -
Oct 31, 2010
filing date -
Oct 31, 2010
priority date (Note) -
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Abstract
Disclosed are various embodiments of high-speed, high-performance, low-noise, low-cost, compact, optical encoders having a multi-faceted flat-faced lens is disposed over the light emitters and light detectors thereof. Disclosed also are various means for preventing undesired stray light from reaching light detectors incorporated therein. Structures employed to block stray light in the optical encoders include light barriers, air gap trenches, and coatings disposed between first and second sides of a substrate of the encoder. Methods of making such optical encoders are also disclosed.
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