Automatic gain control circuit for encoder

Details Automatic gain control circuit for encoder Automatic gain control circuit for encoder

1984-04-26

1987-03-10

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250231SE, 330308, G01J 132, G01D 534

Patent

active

046492674

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.

REFERENCES:
patent: 4190747 (1980-02-01), Feiner et al.
patent: 4250488 (1981-02-01), Haupt

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