Color cathode ray tube
AssigneeHitachi, Ltd.
InventorsGo Uchida, Syoji Shirai
Life of this patent
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Abstract
A color cathode ray tube equipped with an in-line electron gun for emitting three electron beams includes a main lens made up of two cylindrical electrodes arranged in a spaced relationship. Each of the electrodes has an opening and having therein a plate electrode with a beam passing area. The electrodes are given different voltages, wherein D and S have values in a region where all of the following inequalities are satisfied; S<D, and 145.5≦55S−20D S being a beam spacing in mm between central axes of the three adjacent electron beams at the main lens, and D being a dimension in mm related to a distance of a center of at least one of the in-line arrangement of the three electron beams to an inner edge of at least one of the two cylindrical electrodes.
Claims29
A color cathode ray tube equipped with an in-line electron gun comprising three cathodes for emitting three electron beams of an in-line arrangement toward a fluorescent screen, and a main lens for focusing said three electron beams on the fluorescent screen, said main lens comprising a first main lens electrode and a second main lens electrode arranged in a spaced relationship in a direction of an axis of said tube and having different voltages applied thereto, each of said first and second main lens electrodes having an end portion opposing one another and having another electrode set back from said opposing end portion, said another electrode having openings for each of said electron beams, said another electrode being a member which is separate from said opposing end portion and the same voltage being applied to said opposing end portion and said another electrode, wherein T, D and S have values in the region where the following inequalities are satisfied,
- 2S+14.6≦T≦28.1,
- and
- 145.5≦55S−20D
- S being a beam spacing in mm between central axes of said three electron beams at said main lens, T being an outside diameter in mm of a neck portion of a vacuum envelope housing said in-line electron gun, and D being a dimension in mm related to a distance of a center of at least one of said in-line arrangement of the three adjacent electron beams to an inner edge of at least one of said first main lens electrode and second main lens electrode at the opposing end portion thereof.
A color cathode ray tube equipped with an in-line electron gun comprising three cathodes for emitting three electron beams of an in-line arrangement toward a fluorescent screen, and a main lens for focusing said three electron beams on the fluorescent screen, said main lens comprising a first main lens electrode and a second main lens electrode arranged in a spaced relationship in a direction of an axis of said tube and having different voltages applied thereto, each of said first and second main lens electrodes having an end portion opposing one another and having another electrode set back from said opposing end portion, said another electrode having openings for each of said electron beams, said another electrode being a member which is separate from said opposing end portion, assembled as a unit, and the same voltage being applied to said opposing end portion and said another electrode, wherein T, D and S have values in the region where the following inequalities are satisfied,
- 2S+14.6≦T≦28.1,
- and
- 145.5≦55S−20D
- S being a beam spacing in mm between central axes of said three electron beams at said main lens, T being an outside diameter in mm of a neck portion of a vacuum envelope housing said in-line electron gun, and D being a dimension in mm related to a distance of a center of at least one of said in-line arrangement of the three adjacent electron beams to an inner edge of at least one of said first main lens electrode and second main lens electrode at the opposing end portion thereof.
A color cathode ray tube equipped with an in-line electron gun comprising three cathodes for emitting three electron beams of an in-line arrangement toward a fluorescent screen, and a main lens for focusing said three electron beams on the fluorescent screen, said main lens comprising a first main lens electrode and a second main lens electrode arranged in a spaced relationship in a direction of an axis of said tube and having different voltages applied thereto, each of said first and second main lens electrodes having a single opening common to said three electron beams at opposing ends thereof, and each having therein three apertures for electron beam passing set back form said opposing ends, wherein T, D and S have values in the region where the following inequalities are satisfied,
- 2S+14.6≦T≦28.1,
- and
- 145.5≦55S−20D
- S being a beam spacing in mm between central axes of said three electron beams at said main lens, T being an outside diameter in mm of a neck portion of a vacuum envelope housing said in-line electron gun, and D being a dimension in mm related to a distance of a center of at least one of said in-line arrangement of the three adjacent electron beams to an inner edge of at least one of said first main lens electrode and second main lens electrode at the opposing end portion thereof.
Dependencies are inferred from the claim text.