Encoder with a combined position and index track

Details Encoder with a combined position and index track Encoder with a combined position and index track

2008-06-24

2009-11-17

Epps, Georgia Y (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S231130, C250S23700G

Reexamination Certificate

active

07619210

ABSTRACT:
An optical encoder. The encoder includes a coding element, an emitter, and a detector. The coding element has a track with a track pattern. The track pattern includes a plurality of optically distinguishable sections, which include a plurality of position sections and an index section. The emitter generates a light signal incident on the track of the coding element. The detector includes a combined position and index photodetector array. The combined position and index photodetector array includes a plurality of position photodetectors and an index photodetector. Embodiments of this type of optical encoder implement position and index sections in a single track on the coding element.

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patent: 2006/170788 (2006-06-01), None

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