Rotary optical encoder

Details Rotary optical encoder Rotary optical encoder

2006-09-12

2006-09-12

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S231130, C250S231140

Reexamination Certificate

active

07105803

ABSTRACT:
A rotary optical encoder is described to provide the pole position of the rotor in a permanently magnetized motor. Using a simple opening design of code tracks and two light sensors along with a corresponding processing circuit, only one additional code track is required on the code wheel to output phase-changing signals. Thus the rotary optical encoder with phase-changing signal with low cost and small size is implemented.

REFERENCES:
patent: 4650993 (1987-03-01), Boella et al.
patent: 5644127 (1997-07-01), Ohmae
patent: 2005/0133705 (2005-06-01), Hare

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