Color picture projection system with a wavelength-selective refl

Details Color picture projection system with a wavelength-selective refl Color picture projection system with a wavelength-selective refl

1984-07-13

1987-07-07

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 64, 353 30, 353 37, H04N 931, H04N 916, G03B 2126, G03B 2128

Patent

active

046790691

ABSTRACT:
In a color picture projection system three monochrome pictures are superimposed to form a color display on a projection screen by means of a chromatic projection lens system in each of three channels. Each channel has a reflector to fold the light path. Since at least one monochrome picture (e.g. the blue picture) includes radiation within a desired band of wavelengths corresponding to its associated color and radiation outside of this desired band, the reflector in this channel is wavelength-selective and reflects only the radiation within the desired band towards the projection screen. The undesired radiation is transmitted through the reflector so that it does not reach the projection screen. Achromatic lenses are therefore not required.

REFERENCES:
patent: 2697743 (1954-12-01), Schroeder
patent: 2803698 (1957-08-01), de Vrijer
patent: 2953635 (1960-09-01), de Gier
patent: 4051513 (1977-09-01), Takeuchi et al.
patent: 4300156 (1981-11-01), Boyd
patent: 4400723 (1983-08-01), Fanizza et al.
patent: 4454535 (1984-06-01), Machida
patent: 4578710 (1986-03-01), Hasegawa

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