Method and apparatus for determining a position of a movable...

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system

Reexamination Certificate

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C250S231180, C341S013000

Reexamination Certificate

active

06956199

ABSTRACT:
A movable barrier operator includes an absolute position detector which provides a unique value for each position of the barrier along its path of travel. The absolute position detector employs multiple binary serial streams and one multiple clock stream. After the first five cycles of the clock stream, the binary streams can be decoded by a processor to produce an absolute position. Every clock edge produces a new absolute position along the path of travel.

REFERENCES:
patent: 4628298 (1986-12-01), Hafle et al.
patent: 6376832 (2002-04-01), Smith et al.
patent: 2004/0169133 (2004-09-01), Smith et al.

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