ENCODER, DRIVE DEVICE, ABSOLUTE POSITION CALCULATION METHOD, AND ENCODER MANUFACTURING METHOD

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 (JP)
YOSHIDA YASUSHI (JP)
MURAOKA JIRO (JP)

Application Number:

PCT/JP2011/051108

Publication Date:

October 13, 2011

Filing Date:

January 21, 2011

Export Citation:

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Assignee:

YASKAWA DENKI SEISAKUSHO KK (JP)
MUROKITA IKUMA (JP)
YOSHIDA YASUSHI (JP)
MURAOKA JIRO (JP)

International Classes:

G01D5/244

Foreign References:

JP2010025879A	2010-02-04
JP2003121135A	2003-04-23
JPS59225316A	1984-12-18
JP3551252B2	2004-08-04
JP3336396B2	2002-10-21

Other References: