External projection lens aperture

Details External projection lens aperture External projection lens aperture

1995-05-23

1996-07-16

Dawling, William C.

Optics: image projectors

Light shield, mask, hood, or diaphragm

359739, G03B 2114, G02B 900

Patent

active

055371663

ABSTRACT:
An external projection lens aperture, including a holder; an adjustable aperture mounted in the holder; and a self-centering clamping mechanism mounted in the holder for attaching the holder to an end of a projection lens barrel.

REFERENCES:
patent: 2322034 (1943-06-01), Lee
patent: 2510374 (1950-06-01), Brady
patent: 3198065 (1965-08-01), Bohm
patent: 3213750 (1965-10-01), Eggert
patent: 3448673 (1969-06-01), Singer
patent: 4078861 (1978-03-01), Bohme
patent: 4666277 (1987-05-01), Tanaka
patent: 4778252 (1988-10-01), Filho

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