Recorders – Writers – Receiver and marker movable
Patent
1986-07-07
1988-05-24
Broome, H.
Recorders
Writers
Receiver and marker movable
346158, 346161, 358 75, 358 78, G01D 942, G01D 1506, H04N 146
Patent
active
047469340
ABSTRACT:
A color image copying system (10) employs a cathode-ray tube (16) that employs a diffraction grating face plate (38) which for each image disperses to predetermined focal regions (132, 143, and 136) light rays of corresponding wavelengths. The light rays sequentially expose a region 80 of a scrolled light-sensitive medium (42) to form a composite color copy of the image. Bands of phosphorescent materials (32, 34, and 36) are applied on angularly inclined subregions (146, 148, and 150) of the inner surface (144) of the face plate and intercept a raster-scanned electron beam (22) to develop light of the different wavelengths. The inner surface of the face plate has angularly inclined subregions (146, 148, and 150) that provide for incident light rays of each wavelength an angular offset of equal magnitude but opposite rotational sense to compensate for changes in diffraction angles (.beta..sub.1, .beta..sub.2, and .beta..sub.3) that would otherwise result from the transmission of different wavelengths of light through the diffraction grating.
REFERENCES:
patent: 4309720 (1982-01-01), Denham
patent: 4642700 (1987-02-01), Ohta
Angello Paul S.
Broome H.
Reinhart Mark
Tektronix Inc.
Winkelman John D.
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