Cinematograph camera flicker control and/or indicating device

Details Cinematograph camera flicker control and/or indicating device Cinematograph camera flicker control and/or indicating device

1986-06-26

1987-06-02

Hayes, Monroe H.

Optics: motion pictures

Camera and/or projector drive mechanisms

With indicating means

352 49, 352141, G03B 160

Patent

active

046698400

ABSTRACT:
A cinematograph camera flicker indicating or control device uses a microprocessor to determine the combinations of camera speed and/or exposure period, or shutter opening, which will be likely to cause unacceptably uneven exposure of successive frames when filming is carried out under AC powered light sources. An alarm may be activated; alternatively, the camera speed and/or the exposure period and/or the lighting frequency may be automatically controlled by the microprocessor to eliminate or reduce such uneven exposure.

REFERENCES:
patent: 3583800 (1971-06-01), Hirata
patent: 3652154 (1972-03-01), Gebel
patent: 4183635 (1980-01-01), Dorig
patent: 4458992 (1984-07-01), Preston

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