Origin detection method for optical encoder

Details Origin detection method for optical encoder Origin detection method for optical encoder

2008-09-16

2008-09-16

Epps, Georgia Y. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S23700G, C341S013000

Reexamination Certificate

active

11854941

ABSTRACT:
An optical encoder equipped with an origin detection apparatus has a scale provided with an optical grating, a plurality of light receiving elements that is provided in association with the pitch of the optical grating and movable relative to the scale and a light source that illuminates the light receiving elements with light through the scale. An optically discontinuous portion is provided in the optical grating of the scale, a change of a light beam that occurs over a certain length of section at the time when a light beam corresponding to the discontinuous portion is incident on the light receiving elements, a change occurring in that section is detected, calculation is performed, and an origin position is detected from the result of the calculation.

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