Motion picture camera

Details Motion picture camera Motion picture camera

1981-08-24

1983-10-18

Perkey, William B.

Optics: motion pictures

Special effects

Transition effects

G03B 100

Patent

active

044102470

ABSTRACT:
A three-motion picture camera is equipped with a shutter opening angle adjusting device capable of changing the opening angle of a shutter including a plurality of concentrically disposed shutter blades from 0.degree. to a predetermined opening angle by changing on relative position of the shutter blades. The opening angle adjusting device includes a mechanism for varying the relative position of the shutter blades, a cam mechanism for actuating said varying mechanism, and a motor for exclusively actuating the cam mechanism. The adjusting device is further provided with a control device for detecting the speed of the motor and controlling the rotational speed of the motor to a substantially constant speed, whereby the camera can perform fading photography which is assured of fading time and overlap photography having a fading effect.

REFERENCES:
patent: 3635549 (1972-01-01), Stieringer
patent: 3950083 (1976-04-01), Yoshimura et al.
patent: 3972604 (1976-08-01), Yoshimura et al.
patent: 4006975 (1977-02-01), Wagensonner et al.
patent: 4009959 (1977-03-01), Watson et al.
patent: 4106864 (1978-08-01), Burgermann
patent: 4106865 (1978-08-01), Burgermann
patent: 4124283 (1978-11-01), Shigeru et al.
"Velocity Control for Self-Clocked Stepping Motors", by Hendrickson et al., IBM Technical Disclosure Bulletin, vol. 14, No. 8, Jan. 1972.

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