Self calibrating actuator position control system

Details Self calibrating actuator position control system Self calibrating actuator position control system

1995-05-23

1996-09-10

Gellner, Michael L.

3542671, 3542341, G03B 902, G03B 1738, G03B 908

Patent

active

055550606

ABSTRACT:
An actuator position sensor employs a photo interrupter with an optical density gradient segment that has additional maximum and minimum density segments preceding the gradient segment. These preceding segments are sensed and sampled by a calibration circuit, preferably prior to each operation of the actuator, to generate high and low reference calibration values which are applied to a signal scaling circuit along with the gradient output signal. The scaling circuit is then able to generate a position output signal scaled between these reference values that is linearly proportional to the actuator position.

REFERENCES:
patent: 4679667 (1988-09-01), Ishiguro et al.
patent: 4907027 (1990-03-01), Kobe et al.
patent: 5134435 (1992-07-01), Tsuboi et al.
patent: 5325142 (1994-06-01), Depatie et al.

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