Optics: image projectors – Light shield – mask – hood – or diaphragm
Patent
1985-08-27
1986-12-16
Haroian, Harry N.
Optics: image projectors
Light shield, mask, hood, or diaphragm
353 79, G03B 2110
Patent
active
046292993
ABSTRACT:
A microform-reader which comprises a generally rectangular box-like, flattened casing a slide frame slidably supported by the casing for movement between retracted and extended positions, a light-permeable screen mounted on and supported by the casing for movement between folded and erected positions, and a reflective mirror member carried by the slide frame for movement between laid-down and upright positions. When the microform-reader is not in use with the slide frame, the screen and the mirror member being held in the retracted, folded and laid-down positions, respectively, the screen and the mirror member constitute cover members for covering the top and bottom of a space between the casing and the slide frame, but when the microform-reader is in use with the slide frame, the screen and the mirror member held in the extended, erected and upright positions, respectively, the mirror member confronts the screen at a predetermined angle while lying in a plane different from the plane which is occupied by the mirror member when in the laid-down position. The microform-reader also comprises a foldable light-shielding hood for intercepting the entry of external light into the optical path particularly between the reflecting mirror and the screen.
REFERENCES:
patent: 2769368 (1956-11-01), Bearint
patent: 4092064 (1978-05-01), Puel
patent: 4170408 (1979-10-01), Behr
Nakaoka Sadaaki
Ohashi Saichiro
Okano Takeshi
Fuji Photo Film Co. , Ltd.
Haroian Harry N.
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