KR950001227Y1 - Inner shield for c-crt - Google Patents

Abstract

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Description

Magnetic field guided inner seal of color CRT

1 is a cross-sectional view showing the configuration of a color brown tube provided with an inner shield;

FIG. 2 is an enlarged plan view showing the fluorescent surface and shadow mask of the stripe type CRT.

3 is a plan view showing the configuration of the inner shield according to the present invention.

4 is a sectional view taken along the line IV-IV of FIG.

5 is a cross-sectional view taken along the line VV of FIG.

* Explanation of symbols for main parts of the drawings

1: body plate 2: orthogonal part

3: parallel part 4: high permeability layer

The present invention relates to a magnetic induction type inner shield of a color braun tube, and more particularly to a stripe type color brown tube to shield a geomagnetism. It is about improvement of inner seal.

Geomagnetism, for example, has an intensity of about 24 AT / m with a dip of about 55 ° with respect to the horizontal plane in Seoul. The geomagnetism changes the path of the electron beam, causing mislanding or misregistry of the electron beam. For example, in the case of a 16 ″ CRT, the amount of electron beam deviation is about 60μ, and the width of the phosphor strip is about 130μ. Because of this, it is necessary to turn the effects of this geomagnetic properly.

This is usually done by installing edge purity magnets in the tube of the CRT or by attaching an inner shield of thin metal plate of approximately truncated pyramid type to the funnel. For example, in the case of an electric 16 "brown tube, the amount of deviation of the electron beam is reduced to about 25 mu.

As shown in FIG. 1, a color brown tube having such an inner shield for geomagnetic shielding includes a frame of a shadow mask 11 spaced apart from a fluorescent surface 10 formed on an inner surface of a panel P by a predetermined distance. A truncated pyramid-type inner shield 12 is coupled to the rear of 11a) to shield from the influence of the internal external geomagnetism of the funnel F, which is the path of the electron beam from the electron gun 13 installed in the net N. It is.

Here, the inner shield 12 is generally formed of a single member blanking and pressing a thin sheet of Fe-P-based steel, and accordingly, the conventional inner seal is a horizontal (x) and vertical ( y has the same permeability in the direction, and thus the residual geomagnetically transmitted through the inner shield also has the same magnetic flux in the horizontal (x) and vertical (y) directions, so the effect on the electron beam is the same. The amount of deviation of the electron beam is also substantially the same in the horizontal (x) and vertical (y) directions.

However, in the stripe-color CRT, the fluorescent surface 10 is formed between the long black matrix 14 formed in the vertical (y) direction. It is formed by alternately depositing phosphors, and since the shadow mask 11 also has a long slit aperture 11b in the vertical (y) direction, the allowable deviation amount in the horizontal (x) direction In comparison with this, the allowable deviation amount in the vertical (y) direction becomes larger.

Nevertheless, the conventional inner shield 12 reduces the geomagnetism in the horizontal (x) and vertical (y) directions so that the magnetic flux of the residual geomagnetism is the same in the horizontal (x) and vertical (y) directions, Since the inner seal 12 has a size and a required thickness, the material cost and the weight of the CRT increase due to the design of the allowable deviation of the inertia.

The present invention has been made in view of the above-described conventional problems, and provides a magnetic field inducing inner shield which induces the magnetic flux of the residual geomagnetic to be dense in the vertical direction.

In order to achieve the above object, the magnetic field-induced inner seal of the color CRT according to the present invention has a parallel portion extending parallel to the stripe direction of the fluorescent surface and an inner portion of the stripped color brown tube having an orthogonal portion extending perpendicularly. In one embodiment, the orthogonal portion is configured to have a greater permeability than the parallel portion.

Here, as a method of specifying the above-described configuration, it is preferable that the material having a high permeability be bonded to the orthogonal portion by a thin plate or laminated by a method such as vapor deposition or coating.

As a result, the magnetic flux of the residual geomagnetic that has penetrated the inner shield is pushed in the stripping direction and forms a small magnetic field in the orthogonal direction so that the deviation amount of the electron beam in the stripe orthogonal direction is reduced and the stripe is reduced. The amount of deviation in the direction is increased.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The magnetic field guided inner seal according to the present invention shown in FIG. 3 is for use in a conventional vertical stripe-type color brown tube. (2) and the orthogonal part 3 extended in parallel with a stripe direction, Comprising: It consists of a truncated pyramid-shaped body board 1. This orthogonal portion 2 is configured to have a higher permeability than the parallel portion 3 in accordance with the features of the present invention, as shown in FIG. 4 in the orthogonal portion 2 of the inner shield of the conventional configuration in the illustrated embodiment. As shown in FIG. 5, the high permeability layer 4 is formed, and the parallel part 3 becomes only the body plate 1 as shown in FIG. Here, the high permeability layer 4 is formed by bonding a thin plate made of a separate high permeability material to the body plate 1, or laminating a high permeability material on the body plate 1 by a method such as mediation or coating. It is desirable to be. Of course, the orthogonal portion 2 itself may be made of a material having a higher permeability than the parallel portion 3, but in this case, the above-described configuration is more preferable because there is a problem of interconnection or additional assembly work.

The operation of the present invention Inner Shield of such a configuration is as follows. Residual magnetism absorbed by the inner shield and transmitted into the sperm beam path therein, the permeability of the orthogonal portion 2 is greater than the permeability of the parallel portion 3, so that the direction parallel to the parallel portion 3, that is, the phosphor strata The magnetic flux in the direction parallel to the mouth is increased and densified, and the magnetic flux in the orthogonal direction is reduced to have the strained magnetic field dissipated. Therefore, since the magnetic force in the direction parallel to the phosphor strip is strengthened and the magnetic force in the direction perpendicular to the phosphor is weakened, the amount of deviation of the electron beam is also decreased in the direction orthogonal to the phosphor strip and increased in the parallel direction. In this case, the increased deviation is compensated by the shadow mask and thus does not affect the image quality at all. Since the deviation amount perpendicular to the phosphor strip and the horizontal deviation (x) direction are generally reduced, the image quality formed on the fluorescent surface is much higher than that of the conventional art. It's going to be sharp.

Accordingly, even if the inner shield is downsized as compared with the conventional one, there is no deterioration of the effect.

As described above, the inner seal according to the present invention induces the magnetic field of the residual geomagnetism penetrating the same into a desirable form, thereby preventing the degradation of the image quality caused by the geomagnetism, and miniaturizing the inner shield compared to the conventional one, thereby improving the quality of the color brown tube and Excellent effect that can be expected to reduce the weight.

Claims (2)

In the inner shield of a stripe-type color brown tube having an orthogonal portion extending perpendicularly to a parallel portion extending parallel to the stripping direction of the fluorescent surface, the orthogonal portion 2 has a greater permeability than the parallel portion 3. Field-induced inner seal, characterized in that configured to have. The magnetic field induction type inner shield according to claim 1, wherein a high permeability layer (4) is formed by attaching a material having a high permeability to the orthogonal portion (2) by at least one of bonding, vapor deposition, or coating. .