Color Braun tube apparatus with non-circular electron beam passage aperture
First Claim
1. A color Braun tube apparatus, comprising:
- an electron gun having an electron beam generating part for generating three electron beams, including a center electron beam and a pair of side electron beams on both sides of the center electron beam, on an identical horizontal plane and a plurality of electrodes that form a main lens and have an electron beam passage aperture; and
a deflection yoke for allowing the three electron beams emitted from the electron gun to scan in a horizontal direction and a vertical direction, the main lens accelerating and focusing the three electron beams generated from the electron beam generating part with respect to a screen,wherein the main lens is formed by a focus electrode to be supplied with a focus voltage, at least one intermediate electrode to be supplied with an intermediate voltage higher than the focus voltage, and an anode electrode to be supplied with an anode voltage higher than the intermediate voltage, arranged successively in a traveling direction of the three electron beams,the focus electrode and the anode electrode respectively are composed of a tubular body in which a noncircular electron beam passage aperture common to the three electron beams, having a major axis in the horizontal direction and a minor axis in the vertical direction, is formed in a portion opposed to the intermediate electrode,three electron beam passage apertures through which the three electron beams pass are formed in the respective tubular bodies constituting the focus electrode and the anode electrode,an aperture dimension in the vertical direction of the noncircular electron beam passage aperture common to the three electron beams formed in the focus electrode is smaller than an aperture dimension in the vertical direction of the electron beam passage aperture formed in a portion of the intermediate electrode opposed to the focus electrode, andan aperture dimension in the vertical direction of the noncircular electron beam passage aperture common to the three electron beams formed in the anode electrode is smaller than an aperture dimension in the vertical direction of the electron beam passage aperture formed in a portion of the intermediate electrode opposed to the anode electrode.
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Accused Products
Abstract
A main lens is formed by a focus electrode, an intermediate electrode, and an anode electrode successively arranged in a traveling direction of an electron beam. The focus electrode and the anode electrode respectively have an electron beam passage aperture common to three electron beams, having a major axis in a horizontal direction in a portion opposed to the intermediate electrode, and three electron beam passage apertures through which the three electron beams pass are formed respectively in the focus electrode and the anode electrode. Aperture dimensions in a vertical direction of the electron beam passage apertures common to the three electron beams formed respectively in the focus electrode and the anode electrode are smaller than those in the vertical direction of the electron beam passage apertures formed in portions of the intermediate electrode respectively opposed to the focus electrode and the anode electrode. This can provide a color Braun tube apparatus that has less moire while having satisfactory focus performance over the entire surface of a phosphor screen, and in which there are no increase in the cost of a driving circuit and the decrease in withstand voltage characteristics.
4 Citations
6 Claims
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1. A color Braun tube apparatus, comprising:
- an electron gun having an electron beam generating part for generating three electron beams, including a center electron beam and a pair of side electron beams on both sides of the center electron beam, on an identical horizontal plane and a plurality of electrodes that form a main lens and have an electron beam passage aperture; and
a deflection yoke for allowing the three electron beams emitted from the electron gun to scan in a horizontal direction and a vertical direction, the main lens accelerating and focusing the three electron beams generated from the electron beam generating part with respect to a screen,wherein the main lens is formed by a focus electrode to be supplied with a focus voltage, at least one intermediate electrode to be supplied with an intermediate voltage higher than the focus voltage, and an anode electrode to be supplied with an anode voltage higher than the intermediate voltage, arranged successively in a traveling direction of the three electron beams, the focus electrode and the anode electrode respectively are composed of a tubular body in which a noncircular electron beam passage aperture common to the three electron beams, having a major axis in the horizontal direction and a minor axis in the vertical direction, is formed in a portion opposed to the intermediate electrode, three electron beam passage apertures through which the three electron beams pass are formed in the respective tubular bodies constituting the focus electrode and the anode electrode, an aperture dimension in the vertical direction of the noncircular electron beam passage aperture common to the three electron beams formed in the focus electrode is smaller than an aperture dimension in the vertical direction of the electron beam passage aperture formed in a portion of the intermediate electrode opposed to the focus electrode, and an aperture dimension in the vertical direction of the noncircular electron beam passage aperture common to the three electron beams formed in the anode electrode is smaller than an aperture dimension in the vertical direction of the electron beam passage aperture formed in a portion of the intermediate electrode opposed to the anode electrode. - View Dependent Claims (2, 3, 4, 5, 6)
- an electron gun having an electron beam generating part for generating three electron beams, including a center electron beam and a pair of side electron beams on both sides of the center electron beam, on an identical horizontal plane and a plurality of electrodes that form a main lens and have an electron beam passage aperture; and
Specification