A multifunction spotlight and control system therefor, the spotlight functions each being adjustable by a bipolar stepper motor, a control means such as a dimmer unit for enabling analogue control of the rotational positions of the motors, and a second control means such as a microprocessor which enables...http://www.google.com.tw/patents/US4899267?utm_source=gb-gplus-share專利 US4899267 - Spotlight and control system therefor
