To provide an optical encoder with improved resolution.
The optical encoder device comprises a movable optical encoding unit including a plurality of transparent and opaque encoding elements which are arranged alternately, at least two optical detecting elements 201-204, an encoding filter including a plurality of transparent and opaque filter elements 212 which are arranged alternately, and an estimation unit connected to the optical detecting elements such that detection signals from at least two optical detecting elements can be provided thereto, wherein the encoding elements, the filter elements 212, and the at least a pair of the optical detecting elements 201-204 are arranged relative to each other such that the optical detecting elements can be complementarily illuminated with light transmitted through the optical encoding unit and the encoding filter, and a motion information, which is characteristic for a motion of the optical encoding unit, is estimated based on the detection signals.
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CHIN YEE LIM
Arihara Koichi
Matsushima Tetsuo
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