Rotary position detector and associated methods

Details Rotary position detector and associated methods Rotary position detector and associated methods

2011-05-10

2011-05-10

Chowdhury, Tarifur R. (Department: 2886)

Optics: measuring and testing

Angle measuring or angular axial alignment

Reexamination Certificate

active

07940380

ABSTRACT:
A rotary position detector includes a housing having an inner space having a reflective element therewithin. A light source emits light rays upwardly. A base supports a light detector assembly having a first number of toroidal-sector-shaped light sensors disposed in pairs about a motor shaft axis, one “A” detector element and one “B” detector element alternately disposed. A light blocker rotates with the shaft above the light detector assembly and the light source and includes a second number of opaque, equal-surface-area elements arrayed about the axis, the second number equal to one-half the first number. A circuit measures a signal from the “A” and “B” detectors relating to an amount of light falling thereon, a difference related to an angular position of the motor shaft.

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