Diaphragm device

Details Diaphragm device Diaphragm device

1976-06-16

1978-04-25

Hayes, Monroe H.

354 40, 350206, G03B 1738

Patent

active

040866050

ABSTRACT:
In a diaphragm device for use in an optical instrument such as a camera and having two or more diaphragm blades movable across an imaging path of rays and arranged in axially displaced relation from each other to define a common aperture of variable size, there is provided means formed in a portion of at least one of the diaphragm blades to substantially either eliminate or reduce the axial displacement between the diaphragm blades at a relatively small aperture region, whereby the distribution of light energy is made uniform over the entire area of the image.

REFERENCES:
patent: 993431 (1911-05-01), Wollensak
patent: 3442194 (1969-05-01), Sho
patent: 3633486 (1972-01-01), Asazuma
patent: 3846807 (1974-11-01), Sekine
patent: 4009946 (1977-03-01), Geyer

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