Aperture device with edge reflection dispersement feature and op

Details Aperture device with edge reflection dispersement feature and op Aperture device with edge reflection dispersement feature and op

1993-03-30

1995-06-06

Epps, Georgia Y.

Optical: systems and elements

Prism

With reflecting surface

359738, 359707, 359565, 359575, G03B 902, G02B 2744

Patent

active

054226970

ABSTRACT:
An aperture device for use in an optical apparatus has a plurality of aperture blades which cooperate in collectively defining an aperture of a desired size. The inner edge of at least one of such blades defining one side of the aperture is uneven over at least part of the length of the inner edge. The spacing between adjacent relatively high portions and relatively low portions, as well as the depth, is smaller than the exposed length of the inner edge of each aperture blade when the aperture device has been operated to the minimum aperture size. Preferably, the spacing between adjacent crests or between adjacent high portions and low portions of the unevenness varies in a non-periodic manner.

REFERENCES:
patent: 3675562 (1972-07-01), Sanada et al.
patent: 3682075 (1972-08-01), Profitt

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