Back projection apparatus

Details Back projection apparatus Back projection apparatus

1976-02-20

1977-10-18

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

350128, H04N 931

Patent

active

040549070

ABSTRACT:
Three cathode ray tubes are provided for projecting and converging three different primary color images on a back projection screen. The back projection screen has a first cylindrically lenticulated face facing toward the cathode ray tubes for determining a viewing angle of the screen and a second cylindrically lenticulated face on the opposite side thereof for arranging in parallel the emergent light axes of three luminous fluxes respectively projected from the three cathode ray tubes. Color shading of the color image projected on the screen which would be caused by convergence of the three light axes extending from the cathode ray tubes is eliminated by the second cylindrically lenticulated face of the screen.

REFERENCES:
patent: 3166635 (1965-01-01), Todt
patent: 3858001 (1974-12-01), Bonne

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