Title:
ENCODER
Document Type and Number:
Japanese Patent JP2016133452
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an encoder which can maintain accuracy of an origin position regardless of an installation error of a detection head.SOLUTION: In a scale 1, a pattern 12 for origin detection and a displacement detection pattern 11 are formed. A detection head 2 outputs an origin detection signal S1, a phase compensation signal S2, and a displacement detection signal Sm. A signal processing part 3 generates an origin signal by amplifying and adding up the phase compensation signal S2 and/or the origin detection signal S1, and detects a position of the detection head 2 with respect to the scale 1 on the basis of the origin signal and the displacement detection signal Sm. The detection head 2 has a light source 4, a composite light reception grid 5, and a composite light-receiving element 6. The composite light reception grid 5 has a light receiving grid 52 for origin detection and a light receiving grid 53 for phase compensation arranged shifted in a measurement direction with respect to a light receiving grid 51 for origin detection. The composite light-receiving element 6 has: a light-receiving element 62 for origin detection outputting the origin detection signal S1; and a light-receiving element 63 for phase compensation outputting the phase compensation signal S2.SELECTED DRAWING: Figure 2
Inventors:
KATO YOSHIAKI
Application Number:
JP2015009568A
Publication Date:
July 25, 2016
Filing Date:
January 21, 2015
Export Citation:
Assignee:
MITUTOYO CORP
International Classes:
G01D5/36
Domestic Patent References:
| JPH102717A | 1998-01-06 | |||
| JPH067013U | 1994-01-28 | |||
| JPH07134048A | 1995-05-23 | |||
| JPH08313305A | 1996-11-29 | |||
| JP2013152251A | 2013-08-08 | |||
| JPS61182523A | 1986-08-15 | |||
| JPH07270183A | 1995-10-20 | |||
| JP2012242395A | 2012-12-10 | |||
| JP2003149003A | 2003-05-21 |
Foreign References:
| US4602155A | 1986-07-22 |
Attorney, Agent or Firm:
Ken Ieiri