Light amount control unit

Details Light amount control unit Light amount control unit

1994-05-13

1996-06-04

Blankenship, Howard B.

Optical: systems and elements

Prism

With reflecting surface

3542271, 3542341, 3542711, 359228, G03B 908, G03B 902

Patent

active

055238157

ABSTRACT:
A mechanism to regulate a light amount passing through a lens comprises a lens rotatable around the rotation axis thereof, a driver to rotate the rotatable lens; a regulator having an adjustable aperture through which a light amount passing through the rotatable lens is regulated; and a linkage to link the rotatable lens and the regulator, whereby the regulator changes the size of the adjustable aperture in accordance with a rotated position of the rotatable lens.

REFERENCES:
patent: 2481660 (1949-09-01), Harrison
patent: 3445166 (1969-05-01), Kloven
patent: 3638550 (1972-02-01), Hereford
patent: 4390240 (1983-06-01), Bookbinder
patent: 4695144 (1987-09-01), Yoshino et al.
patent: 4793689 (1988-12-01), Aoyagi et al.
patent: 4884090 (1989-11-01), Tanaka et al.
patent: 5218258 (1993-06-01), Shirasa et al.
patent: 5337110 (1994-08-01), Dowe

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