Projection screen
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United States of America Patent
Stats
-
Nov 2, 1993
Grant Date -
N/A
app pub date -
Aug 11, 1992
filing date -
Aug 12, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A projection screen enabling sharp pictorial images to be projected thereon and sound to penetrate therethrough from behind the screen, the entire screen being of uniformly knitted or woven structure, having a screen gain of not less than 0.80 and a permeability of not less than 100 cc/cm.sup.2 /sec and has the acoustic characteristic that the average of increase or decrease in the sound level in the audible frequency band is within .+-.1.0 dB and the maximum attenuation value is within -4.0 dB.
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