Title:
ENCODER
Document Type and Number:
Japanese Patent JP2019078754
Kind Code:
A
Abstract:
To constitute an improved absolute encoder.SOLUTION: According to the present invention, an absolute position encoder comprises a scale and a detector overlapping the scale. The scale includes a cyclic pattern of wavelength Wf and a code pattern of bit length Wcode. The detector includes a set of cyclic pattern detectors and M sets of code pattern detectors. M is 2 or greater. Wcode is larger than Wf and smaller than or equal to M×Wf. The set of cyclic pattern detectors is arranged at array positions along the direction of a measurement axis. Thus, when the set of cyclic pattern detectors moves by a distance equal to contiguous array intervals (each array interval being Wf or smaller) as the code pattern moves in a single direction, they are aligned at contiguous array positions. Since an absolute position is determined on the basis of each of M sets of code detector signals and a spatial cyclic signal obtained by a cyclic pattern detection element, signal processing is performed.SELECTED DRAWING: Figure 4
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Inventors:
TED STATON COOK
JAMES ALLEN HITCHMAN
JAMES ALLEN HITCHMAN
Application Number:
JP2018198517A
Publication Date:
May 23, 2019
Filing Date:
October 22, 2018
Export Citation:
Assignee:
MITUTOYO CORP
International Classes:
G01D5/249
Domestic Patent References:
| JP2000275062A | 2000-10-06 | |||
| JP2000074608A | 2000-03-14 | |||
| JP2015090303A | 2015-05-11 |
Attorney, Agent or Firm:
Ken Ieiri