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Patent Searching and Data


Title:
ENCODER, DRIVE DEVICE, ABSOLUTE POSITION CALCULATION METHOD, AND ENCODER MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2011/125357
Kind Code:
A1
Abstract:
Provided are an encoder, a drive device, an absolute position calculation method, and an encoder manufacturing method, wherein when a relatively large error occurs, the error can be corrected. The encoder comprises: a positional data acquisition unit (120) which acquires upper data representing the position of a mobile object in an upper section in which the mobile object is movable, and lower data representing a position in a lower section repeated multiple times within the upper section by higher resolution than the upper data; a storage unit (130) in which a correction value by which the amount of displacement caused by the upper data with respect to the lower data can be corrected is associated with an absolute position with the same level of resolution as the upper data and stored; a correction unit (140) which acquires the correction value from the storage unit (130) and corrects the upper data; and a section specification unit (150) which, on the basis of the upper data corrected by the correction unit (140) and the lower data when the upper data is acquired, specifies, with respect to the upper section, the lower section in which the lower data is acquired.

Inventors:
MUROKITA, Ikuma (2-1 Kurosaki-Shiroishi, Yahatanishi-ku, Kitakyushu-sh, Fukuoka 04, 〒8060004, JP)
室北 幾磨 (〒04 福岡県北九州市八幡西区黒崎城石2番1号 株式会社安川電機内 Fukuoka, 〒8060004, JP)
YOSHIDA, Yasushi (2-1 Kurosaki-Shiroishi, Yahatanishi-ku, Kitakyushu-sh, Fukuoka 04, 〒8060004, JP)
Application Number:
JP2011/051108
Publication Date:
October 13, 2011
Filing Date:
January 21, 2011
Export Citation:
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Assignee:
KABUSHIKI KAISHA YASKAWA DENKI (2-1 Kurosaki-Shiroishi, Yahatanishi-ku Kitakyushu-sh, Fukuoka 04, 〒8060004, JP)
株式会社安川電機 (〒04 福岡県北九州市八幡西区黒崎城石2番1号 Fukuoka, 〒8060004, JP)
MUROKITA, Ikuma (2-1 Kurosaki-Shiroishi, Yahatanishi-ku, Kitakyushu-sh, Fukuoka 04, 〒8060004, JP)
室北 幾磨 (〒04 福岡県北九州市八幡西区黒崎城石2番1号 株式会社安川電機内 Fukuoka, 〒8060004, JP)
International Classes:
G01D5/244
Attorney, Agent or Firm:
SAKAI, Hiroaki (Sakai International Patent Office, Kasumigaseki Building 2-5, Kasumigaseki 3-chome, Chiyoda-k, Tokyo 20, 〒1006020, JP)
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Claims: