Automatic gain control circuit for encoder
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United States of America Patent
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Mar 10, 1987
Grant Date -
N/A
app pub date -
Apr 26, 1984
filing date -
Apr 26, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A gain control circuit for a light source in an optical encoder derives a signal from the phototransducers that receive the light through the encoder disc. In one embodiment, a signal is taken between the transducer and potential source and in alternative embodiments the signal is taken from the phototransducer output. If a periodic index pulse is generated, a correcting circuit compensates for its effect. Where all of the transducers do not receive a substantially constant continuing illumination level, a filter-integrator circuit provides the d.c. component to the gain control circuit.
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