JPS5927010Y2 - color picture tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color picture tube, and more particularly to an internal magnetic shield installed inside the color picture tube.

Color picture tubes, especially electron beam type color picture tubes with color selection electrodes such as shadow masks, are susceptible to color shift due to the influence of the earth's magnetic field, so they are usually placed along the inner wall of the funnel on the frame that holds the color selection electrodes. The internal magnetic shield is secured by clips or welding.

Next, one example of such a color picture tube will be explained with reference to FIGS. 1 and 2.

In other words, the color picture tube has an electron beam impinging on its inner surface.
A panel 2 has a phosphor surface 1 on which phosphor layers emitting red, green, and youthful light are regularly arranged, and is connected to a side wall 3 of the panel 2 via a funnel 4. a neck 5, an electron gun 6 mounted in the neck 5, and a shadow mask that selects three electron beams from the electron gun 6 and strikes each phosphor layer forming the phosphor surface 1, etc. A mask frame 8 that holds the color selection electrode 7 and is supported via a support by a panel pin embedded in the inner wall of the side wall 3; side 8□first side 10 via clip 9. is fixed, and from the end of the first side 101 on the side wall 3 side, a second side 102 provided along this side wall 3 and this second side are connected.
From the funnel 4 side end of side 102, this funnel 4
The third electrode extends toward the electron gun 6 side at a predetermined interval.
an internal magnetic shield 1 having a side 103 formed to surround the electron beam and serving also as an electron shield;
It is formed from 0.

In the color picture tube having the structure described above, the first side 101 of the internal magnetic shield 10 is formed to be substantially parallel to the surface 81 of the mask frame 8 that is substantially perpendicular to the tube axis. Even if it is fixed with a clip 9 or the like, when a strong alternating current magnetic field is applied from the outside, for example during demagnetization, the internal magnetic shield 10 made of ferromagnetic material vibrates, and as a result, the first side 10 , the vibration is also transmitted to the side 8□ of the mask frame 8 that is substantially perpendicular to the tube axis, resulting in the disadvantage of generating abnormal noise.

The present invention was developed in view of the above-mentioned drawbacks of the conventional art, and it is a color picture tube that has an internal magnetic shield that does not generate any abnormal noise inside the tube even when a strong alternating magnetic field is applied during demagnetization. is intended to provide.

Next, a first embodiment of the color picture tube of the present invention will be described with reference to FIGS. 3 and 4.

That is, the color picture tube consists of a panel 22, on the inner surface of which is adhered a phosphor surface 21 in which a phosphor layer that emits red, green, and youthful colors upon impingement of an electron beam is regularly arranged; The fluorescent surface 21 is formed by selecting three electron beams from a neck 25 connected to the side wall 23 of the panel 22 via a funnel 24, an electron gun 26 mounted in the neck 25, and the electron gun 26. A color selection electrode 27 such as a shadow mask that is projected onto each of the phosphor layers, and a mask frame that holds the color selection electrode 27 and is supported via a support by a panel pin installed on the inner wall of the side wall portion 23. 28 and the clip 2 on the side 28□ that is almost perpendicular to the tube axis of this mask frame 8.
9, the first side 30□ is fixed, and this first side 1
0. From the end of the side wall 24 of the side wall 23, from the end of the second side 30□ provided along the side wall 23 and the 77 inch channel 24 of the second side 10□, the electron beams are placed along the funnel 24 at a predetermined interval. It has a third side 303 extending toward the gun 26 side, is formed to surround the electron beam, and is formed with an internal magnetic shield 30 that also serves as an electron shield, which is similar to that of a conventional color picture tube. Similarly, in this embodiment, the first side 30 of the internal magnetic shield 30
The inclination angle θ is formed to be approximately 5° to 15°, for example, with respect to the side 28 of the mask frame 28 that is substantially perpendicular to the tube axis, and this inclination angle θ is forced when fixing with the clip 29. It can be fixed while being pressed against the side 28□.

With this structure, the first side 30□ is always pressed against the side 28□ by the spring force, so even if a strong alternating current magnetic field is applied from the outside, for example during demagnetization, the internal magnetic shield 30 will cause less vibration and will no longer generate abnormal noise.

Next, a second embodiment of the present invention will be explained with reference to FIG.

In the figure, the same reference numerals as those in the first embodiment indicate the same parts, and no particular explanation will be given.

That is, in this embodiment, the first side 3 of the force section magnetic shield 3o
0'1 is curved convexly from the part to be fixed with the clip 29 to both ends with respect to the side 28□ which is approximately perpendicular to the tube axis of the mask frame 28, as shown in the figure, and when fixed with the clip 29. Fix it by pressing it down.

By adopting such a shape, deformation of the internal magnetic shield 30 can be prevented.

Next, a third embodiment of the present invention will be explained with reference to FIG.

In the figure, the same reference numerals as those in the first embodiment indicate the same parts, and no particular explanation will be given.

That is, in this embodiment, as shown in the figure, the first side 30''t of the internal magnetic shield 30 is connected to the tube axis of the mask frame 28 in the direction of both ends with the portion defined by the clip 29 as the apex. It is bent about the substantially right-angled side 28□, and is fixed by pressing it with the clip 29 when identifying it.

The advantages of this structure are almost the same as the second embodiment.

Next, a fourth embodiment of the present invention will be described with reference to FIG.

In the drawings, the same reference numerals as in the first embodiment indicate the same parts and will not be particularly described.

That is, in this embodiment, the side 28'1 of the mask frame 28 facing the tube axis is provided so as to be inclined as shown in the figure, and the first side 30///1 of the internal magnetic shield is aligned with the tube axis. When fixing with the clip 29, press the clip 29 to fix it.

The advantages of this structure are almost the same as the first embodiment.

Although the above-mentioned embodiment describes the case where the mask frame 28 and the internal magnetic shield 30 are fixed with the clips 29, the same effect can be obtained by using fixing means such as welding instead of the clips.

That is, in the present invention, when fixing the mask frame and the internal magnetic shield, the elasticity of the internal magnetic shield is used to press and fix the mask frame, and the mask frame and the internal magnetic shield are fixed at points other than this fixed part. It is characterized by being able to make bullet contact.

By adopting the above-described structure, there was no generation of abnormal noise due to vibration of the internal magnetic shield, and a color picture tube with good characteristics could be obtained.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing an example of a conventional color picture tube, with Figure 1 being a cross-sectional view, and Figure 2 being a cross-section of essential parts showing the state before the internal magnetic shield is fixed to the mask frame. 3 and 4 are diagrams showing the first embodiment of the present invention, FIG. 3 is a sectional view, and FIG. 4 is a diagram showing the state before the internal magnetic shield is fixed to the mass rail. FIG. 5 is a cross-sectional view of the main part of the second embodiment of the present invention showing the state before fixing the internal magnetic shield to the mask frame, and FIG. 6 is a cross-sectional view of the main part of the second embodiment of the present invention. FIG. 7 is a sectional view of the main part showing the state before the internal magnetic shield is fixed to the mask frame, and FIG. 7 is a main part showing the state before the internal magnetic shield of the fourth embodiment of the present invention is fixed to the mask frame. FIG. 1.21...Fluorescent surface, 2.22...Panel, 7,27...Color selection! Extreme, 8, 28...
...Mask frame, 9,29...Clip, 10.30...Internal magnetic shield.

Claims (1)

[Scope of utility model registration request] In a color picture tube in which an internal magnetic shield is fixed to a mask frame, the sides of the mask frame and the internal magnetic shield that are fixed to each other are formed relatively non-parallel, and do not come into elastic contact at points other than the fixed parts. A color picture tube characterized by being made to obtain.