Photoelectric encoder capable of effectively removing...

Details Photoelectric encoder capable of effectively removing... Photoelectric encoder capable of effectively removing...

2006-12-04

2009-02-03

Yam, Stephen (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S231160, C250S23700G, C356S616000

Reexamination Certificate

active

07485845

ABSTRACT:
A three-grating type photoelectric encoder includes a second grating formed on a scale and first and third gratings disposed on a side of a detector. A part of at least the first grating is shifted in a direction of a measurement axis by P/(2n) (wherein P is a grating pitch, n is the order of a harmonic component to be removed) in order to remove a harmonic component of the nth order. This encoder can be improved with high accuracy by removing harmonic components without increasing manufacturing costs.

REFERENCES:
patent: 4602436 (1986-07-01), Ernst
patent: 5068530 (1991-11-01), Ieki et al.
patent: 5576537 (1996-11-01), Holzapfel et al.
patent: 5801378 (1998-09-01), Hane et al.
patent: 5814812 (1998-09-01), Holzapfel
patent: 5994692 (1999-11-01), Holzapfel
patent: 6094307 (2000-07-01), Ieki

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