Title:
冗長空間位相信号を含むアブソリュート型エンコーダ
Document Type and Number:
Japanese Patent JP6727721
Kind Code:
B2
Abstract:
An electronic absolute position encoder is provided having a scale, a detector, and a signal processor configured to determine an absolute position of the detector along the scale. The scale includes a signal modulating scale pattern comprising a periodic pattern component and a gradual pattern variation component. The detector includes N spatial phase sensing elements (e.g., conductive windings) and at least one reference sensing element, which is spaced apart along the measuring axis direction by a distance corresponding to an integer multiple of 360 degrees of spatial phase shift relative to a first one of the N spatial phase sensing elements. A first reference signal from the first reference sensing element and a first signal from the first one of the N spatial phase sensing elements include nominally similar signal contributions from the periodic pattern component, and a difference between the two signals is due to a difference in their signal contributions from the gradual pattern variation component. The difference may be used to determine a scale factor M1 for a gradual signal variation exhibited by the detector signals output from the detector.
Inventors:
Ted Staton Cook
Application Number:
JP2016180523A
Publication Date:
July 22, 2020
Filing Date:
September 15, 2016
Export Citation:
Assignee:
Mitutoyo Corporation
International Classes:
G01B7/00; G01D5/244; G01D5/245
Domestic Patent References:
| JP2001108484A | ||||
| JP10213408A |
Attorney, Agent or Firm:
Shigeki Orizaka