Device for continuously varying the shutter speed of a video tap

Details Device for continuously varying the shutter speed of a video tap Device for continuously varying the shutter speed of a video tap

1983-12-16

1985-10-08

Griffin, Donald A.

Optics: motion pictures

Shutters

Rotary

358225, 358 55, G03B 910

Patent

active

045456593

ABSTRACT:
A focal plane shutter for a video camera has a pair of disks rotated in the same direction about a common axis in synchronism with the raster scan blanking interval. The phase relationship or relative angular positions of the disks can be continuously varied, while the disks are rotating in use, to vary the shutter speed or exposure time. Mechanisms for continuously varying the angular positions of the disks include mechanical linkages and hydraulic systems.

REFERENCES:
patent: 1115196 (1914-10-01), Hermand
patent: 1525346 (1925-02-01), Warren
patent: 3490835 (1970-01-01), Nemeth et al.
patent: 3715486 (1973-02-01), Wright et al.
patent: 3787116 (1974-01-01), Shimizu
patent: 4171529 (1979-10-01), Silberberg et al.
patent: 4257693 (1981-03-01), Hirata et al.
patent: 4284332 (1981-08-01), Sekine
patent: 4301476 (1981-11-01), Keller et al.

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