User navigation device with a code wheel and an encoder

Details User navigation device with a code wheel and an encoder User navigation device with a code wheel and an encoder

2006-11-01

2010-06-08

Epps, Georgia Y (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C345S169000

Reexamination Certificate

active

07732756

ABSTRACT:
A user navigational apparatus. The user navigational apparatus includes a code wheel and an encoder. The code wheel is coupled to a dial. The code wheel includes a track of alternating reflective and non-reflective sections. The optical reflective encoder includes an emitter and a detector. The emitter generates a light signal incident on the track of the code wheel. The detector detects a reflected light signal. The reflected light signal corresponds to a portion of the incident light signal that is reflected off of the reflective sections of the track. The detector also generates a channel signal corresponding to the reflected light signal. Embodiments of this type of user navigational apparatus achieve reduced thickness compared to conventional implementations of jog wheels.

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