Photographic exposure apparatus for providing small apertures

Details Photographic exposure apparatus for providing small apertures Photographic exposure apparatus for providing small apertures

1976-01-02

1977-11-15

Hix, L. T.

354 59, 354230, G03B 714

Patent

active

040588173

ABSTRACT:
An exposure control system for photographic apparatus having a shutter-diaphragm mechanism for regulating the exposure aperture and the exposure interval under both ambient and flash illumination conditions having a blade arrangement which when driven in an opening direction provides enlarging aperture values in a tracking relation defining both a taking aperture and a photocell aperture. The latter being specially configured to initially provide relatively small aperture values necessary for proper flash exposure at near subject distances includes a pair of blade openings wherein the leading portion of one opening is a segment of short length as measured along the axis of diaphragm movement so that, when it is in overlapping arrangement to the leading edge of the other opening, very small aperture values result.

REFERENCES:
patent: 3006265 (1961-10-01), La Rue, Jr.
patent: 3023683 (1962-03-01), Kobayashi
patent: 3842423 (1974-10-01), Craig et al.
patent: 3896458 (1975-07-01), Johnson et al.
patent: 3952312 (1976-04-01), Douglas

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