US Patent 7994470 Photoelectric encoder
Patent 7994470 was granted and assigned to Mitutoyo on August, 2011 by the United States Patent and Trademark Office.
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The present invention relates to a photoelectric encoder including a scale having a grating (incremental pattern) of a predetermined pitch formed thereon and a light source (light-emitting element) and a light-receiving unit, which are relatively displaceable with respect to the scale, wherein light-receiving elements of the light-receiving unit output bright and dark signals of “N” phases, and the phases are detected by fitting a sinusoidal wave function having a fixed period to the bright and dark signals of “N” phases, thereby reducing a position detection error resulting from stains on the scale and/or defects of the grating.
US Patent 07994470 Photoelectric encoder US Patent 7994470 Photoelectric encoder
US Patent 07994470 Photoelectric encoder
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