Optics: motion pictures – Plural
Patent
1976-01-22
1977-02-08
Hayes, Monroe H.
Optics: motion pictures
Plural
318102, G03B 1918
Patent
active
040069770
ABSTRACT:
A shutter phase lock circuit for a pair of biplane cinecameras having multiframe speeds utilized in a diagnostic X-ray system wherein the cameras are driven by polarized synchronous motors. Each of the cameras have a rotating shutter which is mechanically coupled to a commutator which has a 50% duty cycle and produces a square wave output pulse. The pulses are compared provided that the same camera speed has been selected for both cameras and in the event that two pulses are out of phase by a predetermined phase angle taking into account compensation for mechanical errors, causes an error signal pulse to be produced whose pulse width is a function of the camera speed selected. The error signal pulse is phase locked to the AC line frequency and applied to a control circuit which is adapted to block the AC line voltage applied to one of the camera drive motors (slave) for a time equal to the pulse width of the error signal so as to effect slipping of the slave camera drive motor in repetitive sequences until phase synchronism of both commutator outputs occur.
REFERENCES:
patent: 1450339 (1923-04-01), Smith
patent: 1980806 (1934-11-01), Koenekamp
patent: 2433129 (1947-12-01), Land
patent: 2586392 (1952-02-01), Sheldon
Bonnace Jean Claude
Harrow Charles Lawrence
Wilkens Gunter Gerd
CGR Medical Corporation
Hayes Monroe H.
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