Radiation imagery chemistry: process – composition – or product th – Producing cathode-ray tube or element thereof
Patent
1994-05-27
1995-10-03
Rosasco, S.
Radiation imagery chemistry: process, composition, or product th
Producing cathode-ray tube or element thereof
430 28, 430 29, G03C 500
Patent
active
054551323
ABSTRACT:
In accordance with the present invention, a method of electrophotographically manufacturing a luminescent screen assembly on a photoreceptor disposed on an interior surface of a faceplate panel for a color CRT includes the steps of: charging the photoreceptor to establish a substantially uniform electrostatic voltage thereon; positioning the panel on an exposure device having a light source therein; exposing selected areas of the photoreceptor to visible light from the light source to affect the voltage thereon, without affecting the voltage on the unexposed area of the photoreceptor; and depositing a triboelectrically charged, first color-emitting phosphor onto the selected areas of the photoreceptor. The charging, positioning, exposing and depositing steps are repeated for a second and a third triboelectrically charged, color-emitting phosphor. The present method is an improvement over prior methods because after each of the phosphor deposition and panel recharging steps, the light source is offset in the exposure device by an amount determined by the voltage difference between the photoreceptor and the phosphor, or phosphors, previously deposited onto the panel, thereby counteracting the repulsive effect of the previously deposited phosphor and minimizing the misregister of subsequently deposited phosphors.
REFERENCES:
patent: 3558310 (1971-01-01), Mayaud
patent: 4917978 (1990-04-01), Ritt et al.
patent: 4921767 (1990-05-01), Datta et al.
patent: 5083959 (1992-01-01), Datta et al.
Kreider Robert E.
Ritt Peter M.
Roberts, Jr. Owen H.
Coughlin Jr. Vincent J.
Irlbeck Dennis H.
Rosasco S.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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