Title:
ABSOLUTE ENCODER AND ELECTRIC MOTOR
Document Type and Number:
WIPO Patent Application WO/2023/181213
Kind Code:
A1
Abstract:
This absolute encoder (100) comprises: a scale (10) having an optical pattern (20) including code patterns of a plurality of periods; an illumination unit for outputting light for irradiating the scale (10); a light detection unit for detecting light from the scale (10), which received light from the illumination unit, and outputting a signal that corresponds to the intensity of the detected light; a section assessment unit (15) for assessing, with respect to a region of the optical pattern (20) that is divided into a plurality of sections, a section to which a code sequence read out on the basis of the signal belongs from among the plurality of sections; and an absolute position computation unit (13) for obtaining the absolute position of the scale (10) on the basis of the assessed section and the code sequence. The number of sections in the region of the optical pattern (20) is equal to or greater than 3 when N is 2, and is equal to or greater than N when N is equal to or greater than 3, where N is the number of periods of the code patterns in the scale (10).
Inventors:
TAKUSHIMA SHIGERU (JP)
MUSHA TAKESHI (JP)
HIGUCHI AKIHIKO (JP)
MEKATA TOSHIO (JP)
NOGUCHI TAKUYA (JP)
HASEGAWA HITOSHI (JP)
KUBO YUJI (JP)
MUSHA TAKESHI (JP)
HIGUCHI AKIHIKO (JP)
MEKATA TOSHIO (JP)
NOGUCHI TAKUYA (JP)
HASEGAWA HITOSHI (JP)
KUBO YUJI (JP)
Application Number:
PCT/JP2022/013706
Publication Date:
September 28, 2023
Filing Date:
March 23, 2022
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
G01D5/347
Foreign References:
| JP2007071732A | 2007-03-22 | |||
| JP2010217160A | 2010-09-30 | |||
| JP2005091270A | 2005-04-07 | |||
| JP2004093502A | 2004-03-25 | |||
| JPH041522A | 1992-01-07 | |||
| US20150069225A1 | 2015-03-12 |
Attorney, Agent or Firm:
TAKAMURA, Jun (JP)
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