Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2005-04-26
2005-04-26
Le, Que T. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S231180
Reexamination Certificate
active
06884991
ABSTRACT:
Apparatus (10) includes a first data ring (72) rotatable with a member (24) and includes bit indicators (76) for indicating an absolute angular position of the member. Sensors (100, 102) read the bit indicators (76) of the first data ring (72) and provide a first signal indicative of the absolute angular position of the member (24). A second data ring (74) is rotatable with the member (24) and includes bit indicators (76) for indicating incremental changes in the angular position of the member. Sensors (104, 106) read the bit indicators (76) of the second data ring (74) and provide a second signal, having about twice the resolution of the first signal, indicative of incremental changes in angular position of the member (24). A processor (200) receives the first and second signals and calculates an absolute angular position of the member (24) having a resolution equal to the second resolution.
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Le Que T.
Tarolli, Sundheim Covell & Tummino L.L.P.
TRW Inc.
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