Optics: motion pictures – Special effects – Transition effects
Patent
1977-05-17
1979-02-13
Adams, Russell E.
Optics: motion pictures
Special effects
Transition effects
352141, G03B 2136
Patent
active
041392825
ABSTRACT:
A device is provided for indicating fading operation in cinecamera. A control circuit receives the scene light indicating voltage and a manually adjusted output voltage for operating a diaphragm driving means to adjust the aperture to a proper value for the scene brightness an RC circuit is connected to the diaphragm control circuit which selectively applys either a constant charging or discharging voltage to the diaphragm control circuit, this causes the control circuit to drive the diaphragm to continuously vary the aperture for effecting the fading-out and the fading-in of the scene. A first comparator receives the output voltage of the RC circuit and the output voltage of the diaphragm control circuit and produces a signal when both voltages are coincident. A second comparator connected to the RC circuit produces a signal when the output voltage of the RC circuit reaches a constant charging an indicator receives the output signals of the first and the second comparator for indicating the completion of both fading-out and fading-in of the scene.
REFERENCES:
patent: 4015119 (1977-03-01), Miyake
Ishiguro Yasuo
Kurosu Tomio
Adams Russell E.
Copal Company Limited
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