A resonant scanning unit utilizes a "tuning fork" design with a mirror mounted on one arm of the tuning fork and a counterbalance mass mounted on the other arm. A voice coil electromagnetic motor mounted between the arms causes the arms to move in opposite directions. Light generated by a line of LEDs...http://www.google.ca/patents/US5009473?utm_source=gb-gplus-sharePatent US5009473 - Low vibration resonant scanning unit for miniature optical display apparatus
