Optics: motion pictures – Removable film strip magazine type
Patent
1974-09-30
1976-04-20
Wintercorn, Richard A.
Optics: motion pictures
Removable film strip magazine type
352104, 353 72, 353 77, G03B 2156, G03B 2110, G03B 2122, G03B 2128
Patent
active
039515184
ABSTRACT:
A box-shaped projection screen unit is attachable to an optical projector to constitute a cover therefor. The screen unit comprises a translucent screen mounted in an opening formed through the side of the box opposite an open side of the box which mates with the projector. A rectangular plate hinged to a vertical edge of the box has an internal reflecting surface facing the screen, and is swingable from a storage position covering the screen outward to a projection position in which the plate forms an angle with the screen. A triangular cover plate is hinged to the top edge of the box, and is swingable from a storage position between the rectangular plate and the screen outward to a horizontal position in which another edge of the triangular plate engages with the rectangular plate to hold the same in the projection position and prevent incident light from above from reaching the screen. In operation, an image from the projector is reflected from the reflecting surface of the rectangular plate and focussed onto the screen, and the image is viewed through the box from the open side thereof.
REFERENCES:
patent: 3352203 (1967-11-01), Barke et al.
patent: 3375054 (1968-03-01), Hughes
patent: 3522982 (1970-08-01), Hughes
patent: 3650614 (1972-03-01), Shimoda et al.
patent: 3695746 (1972-10-01), Youngblood
patent: 3746437 (1973-07-01), Pammer et al.
patent: 3807848 (1974-04-01), Shoemaker
Kobayashi Kazuki
Takita Kikuo
Jordan Frank J.
Ricoh Co. Ltd.
Wintercorn Richard A.
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