Optical and magnetic encoder for serially transmitting absolute position signals with an auxiliary power supply
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United States of America Patent
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Jan 29, 1991
Grant Date -
N/A
app pub date -
Mar 9, 1988
filing date -
Sep 29, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The rotation type absolute encoder of the present invention is constituted by a magnetic type one-pulse encoder for detecting one or more rotations, and an optical type absolute encoder comprising a plural number of aspheric LED lens as a light source, a group of detecting elements corresponding to the area of the light source, a slit disc beginning from the track of two slits, and a differential input type current-to-voltage convertor. This absolute encoder is also so constructed as to back up the circuit voltage by an external battery and an internal large capacitance capacitor when a current is cut, and has a circuit for serially transmitting a signal indicating the number of rotations and the absolute angle to an external controller, and a circuit for synthesizing and outputting one reference pulse per rotation from the signals of the magnetic type one-pulse encoder and the optical type absolute encoder.
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