Color cathode-ray tube

Abstract

The invention provides color cathode tube, in which a substantially rectangular shadow mask in a dome shape includes a plurality of tie-bands with a longitudinal direction thereof being a short-side direction of the shadow mask, a plurality of bridges connecting the tie-bands adjacent to each other in a long-side direction of the shadow mask, and a plurality of electron beam passage apertures formed between the tie-bands. In a region sandwiched by a pair of straight lines parallel to the long-side direction, which respectively pass through a pair of the bridges adjacent to each other in the short-side direction, on a surface of the tie-band on a side opposed to a panel, a plurality of non-through concave portions are formed. Consequently, color displacement caused by heat doming of the shadow mask can be suppressed.

Description

technical field [0001] The present invention relates to a color cathode ray tube provided with a shadow mask. Background technique [0002] Figure 11 It is a cross-sectional view showing a schematic structure of a general color cathode ray tube. The color cathode ray tube includes a case 3 in which the panel 1 and the cone 2 are joined together. On the inner surface of the panel 1, a phosphor screen 9 is formed by applying phosphors of each color of red, green, and blue in stripes or dots. The shadow mask 10 is held on the frame 8 attached to the inner wall surface of the panel 1 so as to face the phosphor screen 9 . Inside the neck portion 2a of the tapered tube 2, an electron gun 4 for emitting three electron beams 5 corresponding to the colors of red, green, and blue is housed therein. A magnetic shield 7 for shielding the electron beams 5 from external magnetic fields is mounted on the frame 8 . The color cathode ray tube is constituted by mounting the deflection yo...

AI Technical Summary

Problems solved by technology

[0010] However, if the slurry described in Patent Document 2 is sprayed on the surface of the shadow mask 10 on the side of the electron gun 4 that has a plurality of hemispherical recesses formed in Patent Document 1, it is difficult to sufficiently penetrate the coating material into the recesses. Inside

Therefore, a sufficient electron reflective film cannot be formed in the concave portion.

As a result, in the shadow mask 10 formed with the concave portion, the effect of reducing the amount of thermal arching obtained by forming the electron reflective coating becomes smaller than that of the shadow mask 10 without the concave portion formed.

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