Optical encoder system including a structured code wheel
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United States of America Patent
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Jul 28, 2015
Grant Date -
Apr 23, 2015
app pub date -
Oct 20, 2014
filing date -
Oct 21, 2013
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Abstract
An optical encoder system includes a module that has a light emitting element and a light detecting element, wherein the light detecting element is operable to detect light at a wavelength emitted by the light emitting element. The optical encoder system also includes a code wheel that has facets on its surface. Each facet has a surface that provides diffuse reflectance, with adjacent facets being inclined by different amounts. The code wheel can be disposed with respect to the module so that at least some light emitted by the light emitting element is reflected by the facets back toward the module, wherein an amount of reflected light detected by the light detecting element in the module depends at least in part on the rotational position of the code wheel.
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