Patent ID: 6406742
Filing Date: 2002-06-18
Classification: H01J

Abstract:
A method of manufacturing a cathode ray tube comprising:an electron gun comprising an electron beam generating section for generating a plurality of electron beams that travel in parallel in a horizontal plane and a plurality of electrodes spaced apart in a direction in which the electron beams travel, each electrode having a plurality of holes for guiding the electron beams; a deflection yoke for generating magnetic fields in horizontal and vertical directions of a target so as to deflect the electron beams emitted from the electron gun; an envelope including a neck section in which the electron gun is positioned, a panel section on which the target is provided, and a funnel section which connects the neck section and the panel section and which has an inner diameter flaring from the neck section to the panel section; an inner conductive film provided on an inner surface of a junction between the funnel section and the neck section; and a high-resistance film formed by coating on an inner surface of the neck section, contacting the inner conductive film, covering a part of the electron gun and having a resistance higher than the inner conductive film, said method consisting of: arranging the envelope, with the neck section extending in a substantially vertical direction; supplying a liquid material for forming the high-resistance film into the neck section, said liquid material comprising an alcohol organic solvent, electrically conductive tin oxide particles, and a silane coupling agent dispersed together with the particles in the alcohol organic solvent; and jetting the liquid material through an outlet end toward a point on the inner surface of the neck section, such that all of the liquid material is applied to the inner surface of the neck section along a line inclined to a plane perpendicular to the inner surface, with the outlet end located at a level higher than the point on the inner surface of the neck section onto which the liquid material is applied, thereby forming the high-resistance film in uniform thickness on the inner surface of the neck section.