Patent ID: 6445117
Filing Date: 2002-09-03
Classification: H01J

Abstract:
A cathode ray tube comprising:an evacuated envelope comprising a panel portion having a phosphor screen formed on an inner surface thereof, a neck portion and a funnel portion connecting said panel portion and said neck portion; an electron gun housed in said neck portion comprising at least one cathode, a first grid electrode, a second grid electrode, a plurality of focus electrodes and an anode electrode arranged in the order named, said at least one cathode, said first grid electrode, said second grid electrode, said plurality of focus electrodes and said anode electrode being fixed in predetermined axially spaced relationship by at least two glass beads, said at least one cathode, said first grid electrode and said second grid electrode forming a triode section, and said plurality of focus electrodes and said anode electrode forming a focus lens for focusing at least one electron beam emitted from said triode section on said phosphor screen; a voltage-dividing resistor attached to a surface of one of said at least two glass beads for producing an intermediate voltage to be applied to a first one of said plurality of focus electrodes adjacent to said anode electrode by dividing a voltage applied to said anode electrode, said surface of said one of said at least two glass beads facing an inner wall of said neck portion; and a metal conductor facing and attached to one of electrodes forming said triode section and said focus lens to surround said voltage-dividing resistor and said one of said at least two glass beads, said one of electrodes being disposed upstream of said first one of said plurality of focus electrodes; said voltage-dividing resistor comprising an overcoat insulating film, a resistance element and an insulating substrate stacked in the order named from said overcoat insulating film facing said one of said at least two glass beads, and said resistance element comprising first-type resistance-forming regions disposed on opposite sides of said metal conductor and a second-type resistance-forming region containing a portion thereof facing said metal conductor, said resistance element in said first-type resistance-forming regions extending meanderingly in a direction of a cathode ray tube axis, said resistance element in said second-type resistance-forming region being configured such that minimum distances L1 and L2 between said resistance element and two long sides of said insulating substrate extending in the direction of the cathode ray tube axis, respectively, are larger than corresponding minimum distances between said resistance element and two long sides of said insulating substrate extending in the direction of the cathode ray tube axis in said first-type resistance-forming regions.