Patent ID: 6180306
Filing Date: 2001-01-30
Classification: H01J

Abstract:
A solution for making a photo-conductive layer employed in a method for electro-photographically manufacturing a screen of a cathode ray tube utilizing dry-powdered phosphor particles, the method comprising the steps of:forming a volatile conductive layer on an inner surface of a panel;forming a volatile photo-conductive layer on the volatile conductive layer, the volatile photo-conductive layer containing a material responsive to ultraviolet rays;charging the volatile photo-conductive layer with uniform electrostatic charges; exposing the volatile photo-conductive layer to an ultraviolet ray source, so as to selectively discharge the electrostatic charges from the volatile photo-conductive layer; and attaching the dry-powdered phosphor particles charged with electrostatic charges to the volatile photo-conductive layer;wherein the solution comprises a tetraphenyl ethylene derivative as an electron donor material responsive to the ultraviolet rays, which has a following structural formula, ##STR3##in which R is H, CH.sub.3, C.sub.2 H.sub.5, C.sub.3 H.sub.7, OCH.sub.3, OC.sub.2 H.sub.5, OC.sub.3 H.sub.7, or COCH.sub.3, on a condition of excepting a case where R.sub.1.dbd.R.sub.2.dbd.R.sub.3.dbd.R.sub.4.dbd.H;the tetraphenyl ethylene derivative being dissolved together with trinitro-fluorenone, ethyl anthraguinone and polystyrene-oxazoline copolymer in toluene to form the solution, in which the polystyreneoxazoline copolymer is 10% by weight of the toluene and the tetraphenyl ethylene derivative is