Patent ID: 6359379
Filing Date: 2002-03-19
Classification: H01J

Abstract:
A cathode ray tube comprising:a face panel having a phosphor screen formed on its inner surface; a funnel connected to the face panel; a neck integrally connected to the funnel at a neck seal position; and a deflection yoke mounted on a cone portion of the funnel; wherein a cross section of the cone portion changes from circular to rectangular from the neck seal toward the panel and a groove is formed along each diagonal of the cone portion; and wherein a flute angle, defined as an angle between a first axis and a second axis, which are normal to a tube axis and connects the farthest point on the contour of a cross section of the cone portion and a point on the contour at which the section representing one of the grooves begin, varies from one cross-section to another and has at least one peak between the neck seal position and a standard deflection position of the cone portion, and decreases between the standard deflection position and an inflection point position of the cone portion.