Rear projection screen having a wide-ranged extinguishing rate f

Details Rear projection screen having a wide-ranged extinguishing rate f Rear projection screen having a wide-ranged extinguishing rate f

1990-01-24

1990-12-25

Wintercorn, Richard A.

350126, G03B 2160

Patent

active

049798014

ABSTRACT:
A rear projection screen having a wide-ranged extinguishing rate in which an area of portion for extinguishing the illumination light from exterior of the rear side of screen is widened so that the high contrast can be maintained, which includes a first sheet formed with Fresnel's lens and a second sheet having primary cylindrical lenticules at one side surface and secondary cylindrical lenticules at the other side surface, wherein a focus distance of the primary cylindrical lenticule is made to n/S1(n- 1) and the focus distance thereof is set larger than the distance between the top point of the primary lenticule and the center point of the secondary lenticule whereby clear pictures on the screen can be obtained without lowering the contrast even under an illumination light from exterior.

REFERENCES:
patent: 4636035 (1987-01-01), Clausen et al.
patent: 4752116 (1988-06-01), Sekiguchi
patent: 4859027 (1989-08-01), Kishida
patent: 4921329 (1990-05-01), Ito et al.
patent: 4923280 (1990-05-01), Clausen et al.
patent: 4936652 (1990-06-01), Clausen et al.

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