| 摘要 |
An absolute position encoder converts absolute mechanical position to a digital output value. A single-track, rotary embodiment of the encoder includes several conductive pick-up segments (21a, 22a, 23a, 24a, 25a) that are symmetrically arranged along a circular pick-up track, with each pick-up segment connected to a respective output terminal (21, 22, 23, 24, 25). A metallic rotor (27) of the encoder comprises a plurality of contacts (37) that are positioned in alignment with the pick-up track such that the contacts slidably contact different pick-up segments as the rotor is rotated. The contacts on the rotor are conductively interconnected, and are maintained at a common voltage via a sliding connection between the rotor and a collector ring (26a). The output of the encoder is a cyclical Gray code sequence, which may be used in combination with a ROM look-up table to accurately track position. Linear and multi-track embodiments are also disclosed.
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