KR0133814Y1 - Cathode ray tube - Google Patents

Abstract

The present invention discloses an improved unsealed assembly structure. Conventionally, after assembling the tab formed at the tip to assemble the half of the two pieces, the assembled inner seal is matched with the frame, and the clips are inserted into their through holes, or the welding is combined. This is cumbersome, and thus there is a problem that productivity is lowered.

In the present invention, the through-holes are formed in each half of the frame, and after they are matched with the through-holes of the frame, the clips are inserted and assembled so that the inner shield can be assembled and combined with the frame in one operation. Solved the problem. (Figure 4)

Description

Inner Seal Assembly Structure

1 is a schematic partial cross-sectional view showing a typical cathode ray tube,

2 is an exploded perspective view showing a conventional inner shield configuration,

3 is an exploded perspective view showing an inner shield configuration according to the present invention,

4 is a partially enlarged perspective view of the present invention.

* Explanation of symbols used in the main part of the drawing

10: inner shield 20: frame

2a, 4a, 20a: flange 2b, 4b, 20b: through hole

C: clip

The present invention relates to a CRT, and more particularly to an inner shield of a CRT.

When a CRT is manufactured and shipped from a manufacturer located at a predetermined latitude, it is used at a site of use located at various latitudes. However, when the latitude difference between the manufacturing position and the use position of the CRT is large, the geomagnetic vector, that is, the direction and the intensity of the geomagnetic, varies between the two positions, so that the CRT acts on the CRT. The landing position of the electron beam is moved according to the use position. This effect of geomagnetism is not a big problem for black-and-white CRT scanning single electron beam, but in color CRT, R, G, B three electron beams must be accurately landed through color selecting aperture. Shielding is needed. An inner shield is installed in the color CRT for the purpose of such geomagnetic shielding as shown in FIG.

In FIG. 1, an inner shield 10 formed of a thin metal plate is formed in a flange 20a of a frame 20 that supports a shadow mask SM at a predetermined interval with respect to the fluorescent surface of the CRT. ') Is installed by a clip or welding. The inner shield 10 ′ surrounds the path of the electron beam B such that the path of the electron beam B is not changed by the geomagnetism when the electron beam B is scanned by the deflection coil DY. It also plays a role of improving image quality by preventing re-entry due to diffuse reflection of free electrons off the path.

Such an inner shield 10 'is manufactured in a funnel shape corresponding to the inner shape of the C tube funnel so as to surround the condensation of the electron beam B except for some models such as a small CRT tube. Is common. However, since the inner seal is made of a thin metal plate, a method such as deep drawing cannot be used, and it is usually manufactured by forming a funnel by bending a thin sheet material and assembling it.

Accordingly, conventionally, as shown in FIG. 2, the inner shield 10 'is formed into two h-shaped pieces 2' and 4 ', each having a c-shape, and both h1's. , H2 '), and the inner shield 10' is assembled by bending and joining the tabs 2c and 4c extending to the top of the tip, and the inner shield 10 'is connected to the frame 20. ) Were inserted into the through holes 2b, 4b, and 20b formed in the flanges 2a ', 4a', and 20a ', or welded thereto.

However, the conventional inner seal assembly structure is a cost increase and assembling the two halves (2 ', 4') by manufacturing separate tabs (2c, 4c) in the half (2 ', 4') and the frame Since the work to be coupled to (20) is performed separately, there is a problem that the productivity is reduced, such as an increase in the number of labor.

In view of the above problems, an object of the present invention is to provide an inner shield assembly structure that can improve the productivity since the assembly of the inner shield can be simultaneously performed with the flange and reduce the labor.

Inner shield assembly structure of the present invention for achieving the above object is in the assembly structure for assembling the inner shield coupled to the frame to shield the geomagnetic, the through-holes are formed in each of the flange ends of the two halves to match them And a clip for joining them, and the clip is inserted into the through-hole to be assembled and formed.

Another feature of the assembly of the inner shield to implement the present invention is that the inner shield is coupled to the frame by a clip inserted into the mating inner shield and through-holes of the frame.

Specific features and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings.

In FIG. 3, the inner shield 10 according to the present invention is formed of two pieces 2, 4 of c-shaped pieces by bending a thin plate, and the flanges 2a, A plurality of through holes 2b and 4b are formed in 4a. Meanwhile, in the frame 20 on which the inner shield 10 is supported, a through hole 20b is formed in the flange 20a so as to match with the through holes 2b and 4b of the inner shield 10. A clip C is inserted into the through holes 2b, 4b and 20b of the frame 10 and the frame 20 and joins them.

The inner shield assembly structure of this configuration overlaps the front ends of the two halves 2 and 4 with each other to mate and assemble the through holes 2b and 4b located at the front end. In such a state, the through holes 20b of the frame 20 coincide with the four through holes 2b and 4b of the inner shield 10, and the clips from the through holes 2b and 4b of the inner shield 10 are separated from each other. Insert C) to join them.

Such an assembly structure enables assembling both halves (2, 4) of the inner shield (10), as well as coupling to the frame (20).

Inner shield assembly structure of the present invention as described above is fixed to the through-hole formed in the inner shield and the frame is not provided with a separate tab, so that the clip can be reduced and the labor cost is reduced to improve productivity. .

Claims (2)

In the assembling structure for assembling the inner shield which is coupled to the frame and shields the geomagnetism, through holes 2b and 4b are formed at the ends of the flanges 2a and 4a of both halves 2 and 4, respectively. And a clip (C) for joining them, wherein the clip (C) is inserted into the through holes (2b, 4b) and assembled to form the inner shield assembly structure. The frame (20) of claim 1, wherein the inner shield (10) is inserted into the mating inner shield (10) and the through holes (20b) of the frame (20) by the clip (C). Inner shield assembly structure, characterized in that coupled to.