Optical shaft angle encoder

Details Optical shaft angle encoder Optical shaft angle encoder

1981-06-10

1983-11-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 324163, G01P 344

Patent

active

044171412

ABSTRACT:
An optical shaft angle encoder which provides sensor output voltages having waveform characteristics modified for use with "multiplication type" tachometer converter circuits to provide improved servo control system performance by reducing step changes in the tachometer output voltage due to phase error and reducing tachometer output voltage ripple. The geometry of the encoder mask combination provides a non-sinusoidal sensor output voltage comprised of linear and parabolic segments having a trapezoidal derivative.

REFERENCES:
patent: 3299420 (1967-01-01), Grabow
patent: 3500449 (1970-03-01), Lenz
patent: 4228396 (1980-10-01), Palombo et al.

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