Glass cone for cathode-ray tube

Abstract

The invention provides a glass cone for cathode-ray tube to avoid problems such as improper mismatch of cross section shape produced between both facing ends of the yoke and the neck tube of a glass funnel for a cathode-ray tube when they are welded, and worsening of the appearance of the periphery of the welded and sealed part, local defective welding and sealing, and the problem of welding and sealing strength. In an end region on a small-opening end 4 side of the square yoke portion 5 of the funnel 1, an extended portion 10 is provided whose external surface 8 and inner surface 9 dimensions in their radial directions gradually increase uniformly extending over the whole periphery, as they approach a large-opening end 6 side. The extended portion 10 is formed making the end face 4a of the small-opening end 4 starting end. The contour lines of the external surface 8 and the internal surface 9 of the extended portion 10 in its cross section containing a tube axis Z, are formed with individual arcs having the centers of curvature A, B respectively in regions which are to the peripheral sides of the surfaces and more to the neck tube 3 side than the end surface 4a of the opening end 4.

Description

technical field [0001] The present invention relates to a glass funnel for a cathode ray tube, and more particularly to an improved technique for sealing the end of a deflection deflection deflection deflection deflection angle where the neck tube is sealed in a cone including a main body and a sidewall portion of the deflection deflection deflection deflection angle. Background technique [0002] As is well known, the main components of a cathode ray tube include a glass panel for a cathode ray tube (hereinafter also simply referred to as a panel) having a substantially rectangular image display portion, and a cathode ray tube that seals the panel and allows electron beams to pass through the inside. A glass funnel (also referred to as a funnel hereinafter) is used for the tube. Such as Figure 6 As shown, the aforementioned cone 1 includes a main body portion 7 as a side wall portion 2, which includes a deflection coil portion 5 with a small open end 4 where the neck tube ...

AI Technical Summary

Problems solved by technology

Therefore, the shapes of the opposite ends of the deflection yoke portion 5 and the neck tube 3 become inconsistent, and the welding of the two cannot be performed satisfactorily, and in the direction along the major axis LA, the ends of the deflection yoke portion 5 partially protrude, Prevents the periphery of the weld from forming a uniform shape over the entire circumference

As a result, not only the appearance and aesthetics of the periphery of the welded portion deteriorate, but also poor welding such as local thinning of the welded portion may occur in the direction along the major axis LA, which may cause strength problems around the welded portion.

[0011] Moreover, even if the neck tube 3 is elongated or oval, for example, if the amount of glass melting at the end of the deflection yoke portion 5 is too large, the cross-sectional shape of the end is more along the edge than the cross-sectional shape of the neck tube 3. A long oval or ellipse is formed in the direction of the major axis LA, and the shapes of the opposite ends of the two become inconsistent, so the same problem as above occurs

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