Rotary encoder

Details Rotary encoder Rotary encoder

2005-08-02

2005-08-02

Fulton, Christopher W. (Department: 2859)

Geometrical instruments

Miscellaneous

Light direction

C033S0010DD

Reexamination Certificate

active

06922899

ABSTRACT:
There is provided a rotary encoder which can eliminate an angle error caused by an eccentricity from a measured angle without strictly adjusting hardware and which can also eliminate a graduation error. Detection of a rotation angle of the rotating section and measurement of an error E (θn) included in the detected angle θ are performed in advance, an error function E(θ) represented by a periodic function of the detected angle θ is calculated on the basis of these values, a storing means for storing the periodic function of the calculated error E(θ) is arranged, and an angle obtained by subtracting a value obtained by substituting the detected angle θa for variables in the error function E(θ) from the detected angle θa is displayed on a display unit.

REFERENCES:
patent: 5101102 (1992-03-01), Nishimura et al.
patent: 5435067 (1995-07-01), Uchida et al.
patent: 6622391 (2003-09-01), Shirai et al.
patent: 6774355 (2004-08-01), Kudo
patent: 11-173846 (1999-07-01), None
patent: 2001-264119 (2001-09-01), None
patent: 2002-202157 (2002-07-01), None
patent: 2002-286508 (2002-10-01), None
patent: WO 89/12213 (1989-12-01), None

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