Projection screen

Details Projection screen Projection screen

1992-08-11

1993-11-02

Wintercorn, Richard A.

Optical: systems and elements

Projection screen

Acoustical

G03B 2156

Patent

active

052588700

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.

REFERENCES:
patent: 3692384 (1972-09-01), Kimura et al.
patent: 4006965 (1977-02-01), Takada et al.
patent: 5140460 (1992-08-01), Fukuhara et al.

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