Encoder that optically detects positional information of a...

Details Encoder that optically detects positional information of a... Encoder that optically detects positional information of a...

2007-05-11

2009-10-13

Epps, Georgia Y (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S231180, C250S23700G

Reexamination Certificate

active

07601947

ABSTRACT:
When an incident light is obliquely incident on an index scale, the optical path length of light A becomes longer than the optical path length of light B and an optical path length difference occurs, which causes a phase difference in both of the diffracted lights incident on a photodetection element. According to the phase difference, intensity of a photoelectric detection signal output from the photodetection element changes. That is, due to a periodic change in the incident angle of the incident light, the phase difference between light A and light B is modulated, and the interference signal becomes greatly modulated.

REFERENCES:
patent: 6639686 (2003-10-01), Ohara
patent: 0 451 780 (1991-10-01), None
patent: A-4-265805 (1992-09-01), None
patent: A 2005-3438 (2005-01-01), None
patent: A-2005-326231 (2005-11-01), None
patent: A-2005-326232 (2005-11-01), None

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