ENCODER AND MOTOR WITH ENCODER
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United States of America Patent
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Issued Date -
Jun 9, 2016
app pub date -
Dec 7, 2015
filing date -
Dec 7, 2015
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Abstract
An encoder includes an object body having an absolute pattern formed along a measurement direction, a light source positioned such that the light source emits light to the absolute pattern of the object body, and light receiving elements aligned along the measurement direction such that the light receiving elements receive the light transmitted through or reflected by the absolute pattern of the object body. The light receiving elements include a first light receiving element having a polygonal shape and having a first region in the polygonal shape and a second region formed on an inner side of the first region such that the second region has an optical sensitivity lower than an optical sensitivity of the first region and that the first region includes corner portions of the polygonal shape.
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