Diaphragm with light blocking element

Details Diaphragm with light blocking element Diaphragm with light blocking element

1993-07-23

1995-02-28

Blankenship, Howard B.

354274, G03B 906

Patent

active

053942124

ABSTRACT:
An aperture diaphragm, configured by a plurality of diaphragm blades which are formed with generally wedge-shaped notches for defining small diaphragm apertures, is provided with a supplemental diaphragm blade coupled to one of the diaphragm blades. The supplemental diaphragm blade has a supplemental notch which is similar in shape to but shallower than the generally wedge-shaped notch of the one of the diaphragm blades so as to block up the smallest diaphragm aperture defined by the generally wedge-shaped notches of the diaphragm blades.

REFERENCES:
patent: 3668995 (1972-06-01), Bardutzky
patent: 3727531 (1973-04-01), Baab
patent: 4975725 (1990-12-01), Morisawa
patent: 5225936 (1993-07-01), Sugiura et al.
patent: 5250971 (1993-10-01), Okura

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