Camera having an aperture controllable shutter

Details Camera having an aperture controllable shutter Camera having an aperture controllable shutter

1994-06-15

2000-07-11

Adams, Russell

Photography

Exposure control system responsive to focal length

Control of full open aperture value

396449, G03B 700

Patent

active

060885343

ABSTRACT:
A camera provided with an aperture controllable shutter capable of determining exposure by varying aperture movement, and a photographic lens capable of varying focal length. In accordance with the focal length of the photographic lens, an aperture size or an aperture characteristic of the aperture controllable shutter is determined. A diaphragm of the aperture controllable shutter is driven based on the determined aperture size, aperture characteristic and object brightness.

REFERENCES:
patent: 4794418 (1988-12-01), Kabayashi et al.
patent: 4899191 (1990-02-01), Maruyama
patent: 4945380 (1990-07-01), Katoh et al.
patent: 4959680 (1990-09-01), Ishida et al.

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