Optics: motion pictures – Stereoscopic cameras and/or projectors – Sequential recording or reproducing left-right images
Patent
1990-03-23
1991-03-26
Hayes, Monroe H.
Optics: motion pictures
Stereoscopic cameras and/or projectors
Sequential recording or reproducing left-right images
350132, G03B 3502, G03B 3516
Patent
active
050023870
ABSTRACT:
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 transition 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 locks on to the frequency and a counter counts the pulses. After a preset delay the counter outputs a pulse. The delay is adjustable. The counter pulse enables a 60 KHz oscillator. The oscillations are counted by another counter and passed to a transmitter. The 60 KHz oscillations are disabled when the other counter reaches a preset amount. The other counter sets the duty cycle of the transmitter. Each of the components in the unit is duplicated in a back-up section. The back-up section is enabled when the primary phase lock loop is not locked on and the back-up phase locked loop is locked on.
REFERENCES:
patent: 3737567 (1973-06-01), Kratomi
Lipton, Lenny, Foundations of the Stereoscopic Cinema: A Study in Depth. Van Nostrand Reinhold: New York, 1982, Chapter 6.
Baljet Anton L.
Carter Gerard C.
Harris Gordon W.
Hayes Monroe H.
Imax Systems Corporation
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