JPS6145542A - Support frame for color cathode-ray tube - Google Patents

Abstract

PURPOSE:To obtain a shielding effect without using a shielding plate, excellent assembly workability, and cost reduction by setting a side wall higher so as to protrude from the sealing surface of a panel to the neck side and widely forming the bottom so that an electron beam cannot collide against the said side wall. CONSTITUTION:The side wall 10a of a support frame 10 is formed higher so as to protrude from the sealing surface 16 of a panel 13 and a funnel 15 to the neck side. In addition, the bottom 10b of a support frame 10 is formed widely so that an electron beam can be prevented from colliding against the said side wall 10a. As a result, since side wall 10a is formed higher, it cuts off the electron beam that arrives at a phosphor screen 13a passing through the support frame 10 and bulbs 13 and 15 and is also provided with an effect that screens the effect of an external magnetic field. In other words, the side wall 10a has the outside electron shield and inner shield characteristics. In addition, since the bottom 10b is widely formed, the same effect as the inside electron shield can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support frame for a color cathode ray tube.

A conventional color cathode ray tube has a structure as shown in Figure 1. That is, a shadow mask 2 is fixed to a support frame I, and a plurality of springs (not shown) are fixed to a support frame l to form a shadow mask structure k+t3, and the springs of this shadow mask structure are installed in a panel 3. The shadow mask structure is held on the inner surface of the panel by fitting into provided panel pins (not shown).

An electron shield plate 4 and an inner shield plate 5 are fixed to the frame 1 by a spring (not shown) or welding. In addition, although the funnel 6 is welded and sealed to the panel 3 with a frit glass 7 to form the pulp, such a structure is particularly difficult to maintain in the fixed position of the electron shield plate 4 and the inner shield plate 5 when used in small color plows/tubes. Since the tolerance is small, the workability of assembly is poor, and there are also problems such as shield plates 4, 5F and RF shape being required during confectionery making.

Furthermore, since the shield plate 4.5 is used, there is a drawback that the cost increases accordingly.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a support frame for a color cathode ray tube that has a shielding effect without using a shield plate, has excellent assembly workability, and can reduce costs.

The present invention will be explained below with reference to an embodiment shown in FIG. A shadow mask 11 and a spring I2 are fixed to the support frame 10 to form a shadow mask structure.In this shadow mask structure, the spring 12 is fitted into the panel 14 installed in the panel 13 and the inner surface of the panel is fixed. is held in Luxurious panel 13 and funnel 1
5 is welded and sealed with frit glass 16. The side wall 10 a i of the support frame 10! : Spring k1
3 and the sealing surface of funnel 15! 6, it is higher than the conventional inner shield 5 (
(see Figure 1). Further, the bottom surface 101) of the support frame 1o is the side wall 10aV.
r, it is formed wider than the conventional one to prevent the Kameko beam from appearing.

In this way, since the side 510a is formed high,
It blocks the electron beam that follows the r:1 of the support frame 10 and the pulp L3.15 and reaches the fluorescent surface 13aK, and also has the effect of shielding the influence of an external magnetic field. That is, the side 10a has the characteristics of an outer electron shield and an inner shield. Since the bent bottom surface 10b is formed wide, it blocks the electron beam that passes through the inside of the bottom surface IQh and is reflected toward the side 110a. That is, the bottom surface lOb can obtain the same effect as the inner electron shield.

FIG. 3 shows another embodiment of the invention. In the above embodiment, the bottom tab was bent almost at right angles to the side JJIOa.
In this embodiment, the side wall 10a and the surface 10b are connected to the funnel 1.
5 and are connected via a tapered portion 10c along the line 5. Even if it is formed in this way, it has the same effect as the above embodiment.

Next, the results of an experiment applied to a support frame lOf, 5ri color cathode ray tube having the above configuration will be explained. In the case of the embodiment shown in FIG. 2, for example, from the sealing surface 16 to the bottom surface fob-! The height hl is 12.0 plates, the width of the bottom fob is fl? l't8.6L? When set to L, a shielding effect equivalent to the conventional one was obtained without using the conventional electron shield plate and inner shield plate. In the case of the embodiment shown in FIG. lax,
The height h2 of the tapered portion 10c in the side t4toa direction is 7 skins,
The gap 12 (in the job direction of the bottom surface of the tapered part 10c) is 4m11.
As a result, the same effect as the above implementation was obtained.

As is clear from the above description, according to the present invention, the electron shield plate and inner shield plate that were conventionally required are unnecessary, and the support frame has a shielding effect, so it is not only easy to assemble, but also reduces costs. I can figure it out.

+Mff Basic explanation of the drawings Figure 1 is a schematic cross-section of a conventional color cathode ray tube [Figure m,
FIG. 2 is a schematic cross-sectional view showing an embodiment of a color cathode ray tube using a support frame according to the present invention, and FIG. 3 is a schematic cross-sectional view showing an embodiment of a pond according to the present invention.

lO...support frame, lOa...side u,
10b...M, surface, 13...panel, 15...
...Funnel, 16...Frit glass (sealing surface).

Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] In a support frame constituting a shadow mask structure of a color cathode ray tube, the side wall is formed higher than the sealing surface of the panel and the funnel so as to protrude toward the neck side, and the bottom surface is formed wide so as to prevent the electron beam from hitting the side wall, A support frame for a color cathode ray tube in which the side wall and bottom surface have an inner shield and an electron shield effect.