Uniform exposure single blade shutter - has pivot location and aperture shape modified to achieve uniform exposure over field of image

摘要

A single bladed photographic shutter is suitable for incorporation in the limited space of miniature cameras. It has a drive element (7) released by the exposure control to run against the shutter blade (1) to pivot it about its bearing (5), after which it is returned by a spring (6) to its original setting against the stop (4). The leading edge (1a) of the blade is close to the aperture (3) to increase the angle swept by the edge and increase the exposure of the part of the image field given the least exposure by the action of the shutter. In the area of the longest opening of the shutter there is a reduction (3a) in the aperture so that the area given maximum exposure is reduced. The overall effect is to reduce the non-homogeneity of exposure over the image field natural to the action of a single blade shutter.