Control system for oscillatory-mirror light beam deflector

Abstract

A control system for controlling an oscillatory-mirror light beam deflector such as a resonant light beam deflector with a reflecting mirror, has a drive circuit for applying a drive signal to energize the oscillatory-mirror light beam deflector, and a detector for detecting a drive condition of the oscillatory-mirror light beam deflector and producing a drive condition signal indicative of the detected drive condition. A PID processor circuit, which is composed of a proportional circuit, an integrator, and a differentiator, generates an adjusting signal from the drive condition signal produced by the detector. The differentiator has a variable resistor for varying a feedback resistance thereof. A processor processes the drive condition signal with the adjusting signal thereby to produce the drive signal.

Dependencies are inferred from the claim text.