Absolute encoder
AssigneeTokyo Kogaku Kikai Kabushiki Kaisha
InventorsHiroshi Tamaki, Fumio Ohtomo, Kazuaki Kimura
Life of this patent
Estimating the term…
Abstract
An absolute encoder comprising a sensor array, a code plate arranged in opposition to the sensor array and having a plurality of blocks in the direction of normal displacement, each block having an address track and a fine reading track, and an arithmetic unit for processing data of the code plate detected by the sensor array. Each of the blocks of the code plate has a reference track, an address track and a fine reading track. The fine reading track of each block has fine reading patterns which change in a direction crossing said direction of normal displacement.
Claims13
An absolute encoder having:
- a code plate with a plurality of blocks in the direction of its displacement, said code plate having at least, in each block, both address data representing an address of the block and a fine reading track representing a fine displacement within the block;
- a sensor array in which a plurality of sensor elements are arranged in a direction crossing the direction of displacement of the code plate and which is so arranged to detect data of the code plate;
- and
- an arithmetic unit for processing the data of the code plate detected by the sensor array,
- characterized in that fine reading patterns varying in a direction crossing the direction of displacement of the code plate are formed in the fine reading track.
Dependencies are inferred from the claim text.