Projection screen
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United States of America Patent
Stats
-
Jul 13, 1982
Grant Date -
N/A
app pub date -
Jul 18, 1980
filing date -
Jul 18, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A projection screen is formed of a rectangular, tubular, annular frame of flexible material, a projection sheet of flexible material covering one side of the frame and a foil of flexible material covering the opposite side of the frame. A valve is connected to the frame and another valve is connected to the compartment defined by the inner side of the frame, the foil and the sheet. The projection screen device is thus completely collapsible. In order to put the screen into operative condition, the frame is inflated to a stiff condition, and a subatmospheric pressure is established in said compartment, whereby to bring the sheet, and possibly also the foil, to take a concave, substantially spherical shape. Also the foil can constitute a projection screen surface, possibly with another curvature than the sheet.
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Family
International Classification(s)
Cited Art Landscape
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