Patent ID: 6222311
Filing Date: 2001-04-24
Classification: H01J

Abstract:
A cathode ray tube including a vacuum envelope comprising a panel portion having a phosphor screen on an inner surface thereof and suspending a shadow mask closely spaced from said phosphor screen, a neck portion having a stem fused and sealed to one end thereof, said stem having stem pins annularly arrayed, sealed thereto and extending therethrough for supporting an electron gun in said neck portion, and a funnel portion for connecting the other end of said neck portion and said panel portion;a stem mound being raised and formed integrally with said stem around a base of each of said stem pins on an electron-gun-supporting side thereof;said stem being provided with a raised outer circular edge;a first distance R1 being defined as a distance from a center axis of said neck portion to an inner wall in a region of said neck portion facing a major portion of said electron gun;a second distance R2 being defined as a distance from said center axis to an outside edge of said stem mound as measured at half an axial height of said stem mound; andsaid first distance R1 and said second distance R2 satisfying a relationship, 0<R1-R2<2.1 mm.