Optics: image projectors – Plural projection paths with single light source
Patent
1974-09-12
1976-06-08
Hayes, Monroe H.
Optics: image projectors
Plural projection paths with single light source
353 71, G03B 2156
Patent
active
039618390
ABSTRACT:
A projection screen having back-to-back screen surfaces is provided outside a building for projection of images from within the building from a slide projector or the like positioned at a projection window. A mirror unit is provided on the outside for receiving the image from the projector and directing it onto the outside screen surface. Display material is provided on a roll-up screen which is pulled down during the daytime. A shade is provided over the screen surfaces to shield the screen from outside light sources. The projector in the building is on a rotatable support and a mirror is provided adjacent the projection window for directing the image to a screen in the building upon the projector being turned slightly. The screen outside the building may allow an image to be projected through it thereby providing an image on both sides thereof and thus requiring only one projector.
REFERENCES:
patent: 1798078 (1931-03-01), Geyling
patent: 2022903 (1935-12-01), Thomas
patent: 2391879 (1946-01-01), Chambers
patent: 2528311 (1950-10-01), Hurley
patent: 2895233 (1959-07-01), Welch
patent: 3587183 (1971-06-01), Davis
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