Rear projection screen

Details Rear projection screen Rear projection screen

1990-04-26

1991-06-04

Wintercorn, Richard A.

G03B 2160

Patent

active

050208772

ABSTRACT:
A rear projection screen comprises, in combination, a Fresnel lens having concentric annular ridges arranged at a radial pitch of P1, and a lenticular lens having parallel lenticulars arranged at a pitch P2. The pitch ratio P1/P2 between the pitches P1 and P2 is determined in the range of 0.1505 to 0.1545 or in the range of 0.176 to 0.181. The rear projection screen meeting such a condition suppresses effectively the moire effect of the concentric annular ridges of the Fresnel lens and the parallel lenticulars of the lenticular lens disposed adjacent to the Fresnel lens.

REFERENCES:
patent: 2567654 (1951-09-01), Siezen
patent: 2567655 (1951-09-01), Siezen
patent: 4636035 (1987-01-01), Clausen et al.
patent: 4725134 (1988-02-01), Ogino
patent: 4880292 (1989-11-01), Kageyama et al.
patent: 4919515 (1990-04-01), Hasegawa et al.
patent: 4919518 (1990-04-01), Ogino et al.
patent: 4961642 (1990-10-01), Ogino

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