Projection synchronization system

Abstract From the Canadian patent

An alternate eye 3-d projection system has a projector projecting alternate eye left and right images, has alternating eye 3-d glasses alternating between left and right lens transmissiveness and has a phase delay unit synchronizing the left lens transmissiveness to left images and right lens transmissiveness to right images. A timing shutter is driven through a mechanical link to the projector primary mechanism at a frequency proportional to the frequency of the transistion between images. A sensor outputs pulses according to the rotationally frequency of the timing shutter. The phase delay unit receives the pulses a multiplier multiplies the frequency of the pulses a phase lock, loop …