Camera with pivoting blades

Details Camera with pivoting blades Camera with pivoting blades

1974-07-02

1976-03-02

Sheer, Richard M.

Optics: motion pictures

Removable film strip magazine type

352141, 354230, 354246, 354247, 354264, G03B 914

Patent

active

039421830

ABSTRACT:
A pivoting exposure control system is provided for a photographic apparatus wherein the exposure control system includes a shutter blade apparatus for respectively blocking and unblocking the passage of light through a light entry exposure opening in a camera housing. The shutter blade mechanism includes two shutter blade elements which are disposed for both pivoting and translational motion about a first fixed pivot point spaced laterally apart from the light entering opening in the camera housing. Rotating means pivotally connect at two spaced-apart locations to the respective shutter blade elements so that the shutter blade elements may be simultaneously rotated about a second pivot point spaced laterally apart from the light entering opening and the first pivot point. In this manner, the shutter blade elements may be simultaneously moved over the light entering exposure opening to define a progressive variation of effective apertures.

REFERENCES:
patent: 3672267 (1972-06-01), Harvey et al.
patent: 3750543 (1973-08-01), Eloranta et al.
patent: 3781099 (1973-12-01), Williams et al.

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