Colour cathode-ray tube

Abstract

In the color cathode ray tube of the present invention, the stem 13 that seals the neck end of the glass funnel that constitutes the vacuum envelope is provided with an internal wire segment 28 that extends to the inside of the neck, an external wire segment 29 that extends to the outside of the neck, and a connecting wire. The connecting wire segment 30 of the two. The inner wire segments 28 are arranged along the first circumference, and are respectively supported by the protrusions 31 protruding from the stem 13, and the outer wire segments 29 are arranged along the second circumference larger in diameter than the first circumference. It is connected by connecting wire segments 30 that are bent in the stem 13 and the protrusion 31 .

Description

technical field [0001] The present invention relates to a color cathode ray tube, in particular to a color cathode ray tube capable of reducing deflection power, improving focus characteristics, and achieving good resolution. Background technique [0002] Usually a color cathode ray tube has a panel, a funnel-shaped glass funnel connected to the panel, and a cathode ray tube stem (stem, hereinafter referred to as "stem") welded to the end of the cylindrical neck of the glass funnel. ”) to form a vacuum enclosure. There is an electron gun inside the neck of the glass funnel, and the three electron beams emitted from the electron gun are deflected by the magnetic fields generated by the horizontal and vertical deflection yokes installed outside the glass funnel, and shoot to the device through the shadow mask. A fluorescent screen composed of three-color phosphor layers on the inner surface of the panel, the fluorescent screen displays color images under the horizontal scanni...

AI Technical Summary

Problems solved by technology

However, if the neck is made thinner, the voltage that can be supplied to the dynamic focus electron gun through the wires that seal the stem at the end of the neck is insufficient, and there is a problem that the resolution cannot be improved.

[0024] One of the methods to focus on such a problem is to consider increasing the number of wires without changing the arrangement diameter of the wires of the stem, but once the number of wires is increased, interchangeability with other color cathode ray tubes cannot be obtained, and Problems with Compromised Versatility

[0025] Another proposed method is that the inner diameter of the neck is 19.1mm~23.1mm, and the arrangement diameter of the wires of the stem is 12.2mm~15.3mm. However, for the neck usually made of glass, according to the withstand voltage characteristics and mechanical strength Requirements, the thickness of more than 2mm is required, so in this case the outer diameter of the neck is 23.1mm ~ 27.1mm, there is a problem that the power saving of the color cathode ray tube is not sufficient

[0026] In addition, in order to avoid cracks in the welded part when welding a stem with a diameter of 15.24 mm as a stem for a stem with an outer diameter of 29.1 mm to a neck with an outer diameter smaller than 29.1 mm, it has been proposed to make the neck The thickness of the welded part of the stem is made thinner, and the inner diameter of the neck is partially enlarged, but this method reduces the mechanical strength of the neck, and the neck is prone to breakage and cracks, and there is a problem of reduced reliability.

[0027] Propose such method again as avoiding the method that crack takes place in the welding part of above-mentioned neck and stem, this method is, make the diameter of the circumference that the inner conductor segment of stem is arranged be made than the diameter of the circumference that outer conductor segment arranges small, enlarging the distance between the raised portion surrounding the inner wire section and the inner wall of the neck, but there is no specific description in the proposal that even if the neck is made thinner, the raised portion and the neck of the inner wire section surrounding the stem can be realized. The spacing of the inner wall of the inner part without reducing the reliability of the cathode ray tube, and there are difficulties in implementation

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