Photocopying – Contact printing – Light boxes
Patent
1975-05-05
1976-07-20
Wintercorn, Richard A.
Photocopying
Contact printing
Light boxes
96 361, 355 71, G03B 4100
Patent
active
039710432
ABSTRACT:
An electroluminescent screen for a color cathode ray tube of the shadow-mask type having a plurality of light absorbing stripes and elemental light emitting electroluminescent stripes each separated by one of the light absorbing stripes is produced by locating a movable shield plate between a light source and shadow mask, the shield having an opening for limiting the path of light between the light source and the shadow mask. The shield plate is moved so as to move the irradiated area on the shadow mask along the length of rows of apertures of the mask. The light source is gradually inclined synchronously with the moving of the irradiated area on the shadow mask to be kept always substantially parallel to the rows of apertures in the irradiated area. The light source has a substantial longitudinal length and narrow width and moves transversely with respect to that length with predetermined amplitude and frequency during movement of the irradiated area across the mask. The light may be so formed that the light emitted from both ends is more intense than that emitted from the center portion thereof.
REFERENCES:
patent: 2936682 (1960-05-01), Krawitz
patent: 3563737 (1971-02-01), Jonkers
patent: 3667947 (1972-06-01), McKee
patent: 3725106 (1973-04-01), Hosokoshi
patent: 3736848 (1973-06-01), Tsuneta et al.
Akiyama Masanori
Suzuki Takeshi
Takenaka Shigeo
Tanaka Hiroshi
Tokyo Shibaura Electric Co. Ltd.
Wintercorn Richard A.
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