KR19990027071A - Cathode Ray Panel - Google Patents

Abstract

The present invention provides an optimum vacuum strength and light weight cathode ray tube panel.

The panel according to the invention has a substantially rectangular effective screen portion E and a skirt portion 12 'and a sealing surface 13 to be sealed with the funnel, with a short axis Y in the skirt portion 12'. The thickness t1 of is larger than the thickness t2 of the major axis X, and the thickness t3 of the diagonal axis Z is configured to be the smallest, so that the stress acting by atmospheric pressure is most reduced. Maximum intensity without concentration.

Description

Cathode Ray Panel

The present invention relates to a panel for a cathode ray tube, and more particularly to a structure from an effective screen portion boundary line of a panel to a skirt portion, which can be reduced in weight and is an optimal structure corresponding to a stress acting on a cathode ray tube tube by high vacuum.

In a typical cathode ray tube panel, stress due to high vacuum after exhausting acts on the tube. The panel is constructed with strength corresponding to the stress generated by such high vacuum, but a conventional configuration is shown in FIG.

Referring to FIG. 3, the tube is manufactured by joining the panel 12 and the funnel 14 in the sealing surface 13 by frittglass, sealing by inserting an electron gun in the neck portion, and then evacuating the tube at high vacuum. . In the panel 12 manufactured as described above, the boundary line outside of the effective screen portion E has an inner corner radius r 'and an outer corner radius R' as dotted lines to withstand the stress caused by the high vacuum as shown in FIG. As shown in the figure, the thickness of the corner portion is made larger by making it smaller than the inner surface radius r and the outer surface radius R of the effective screen portion E. FIG.

However, in order to facilitate the manufacture of a mold for manufacturing the panel 12, the inner corner radius r 'and the outer corner radius R' are formed the same over the outer circumference of the panel 12. In this case, there is a problem that the part is formed to be unnecessarily thick, so that the material cost is not only high, but also becomes large as it is enlarged, and becomes heavy not only in the manufacturing process but also in use.

On the other hand, as shown in Figs. 2 and 3, the stress (a) of the short axis (Y) is actually larger than the stress (b) of the long axis (X), and the stress (c) of the diagonal axis (Z) is the smallest. It has been shown that the stress d acts on the corner portion of the panel 12 in the side view. That is, the tensile stress acts in the order of the short axis (Y) direction, the major axis (X) direction, and the diagonal axis (Z) direction.

Therefore, according to the conventional technique described above, an increase in the same thickness does not optimally cope with the above stress distribution and leads to the addition of only waste or weight of the material, and also, as in the side view, the corner portion. The skirt portion 12 'with respect to the stress d has a problem such that it cannot be coped properly.

In addition, when the stress due to movement or impact in the manufacturing line is mainly concentrated on the skirt portion 12 'of the panel 12, as described above, failure may occur when the thickness of the skirt portion 12' is not taken into consideration. There is a problem of high concern.

Accordingly, an object of the present invention is to provide a panel for a cathode ray tube which can reduce the manufacturing cost by constructing a strength that is optimally corresponding to the stress distribution caused by high vacuum and reducing the manufacturing cost. have.

1 is a partial cross-sectional view showing the shape of a skirt portion of a conventional cathode ray tube panel;

2 is a plan view showing a stress distribution state of a cathode ray tube tube vacuumed by an exhaust process;

3 is a side view showing a stress distribution state of the cathode ray tube tube of FIG.

4 is a cross-sectional view showing the structure of a panel for a cathode ray tube according to the present invention;

FIG. 5 is an enlarged cross-sectional view of a skirt portion of the cathode ray tube panel of FIG. 4; FIG.

Explanation of symbols for main parts of the drawings

12 panel 13 sealing surface

13 ': reference point 14: funnel

r: inner radius R: outer radius

r ', r: inner corner radius R', R: outer corner radius

a1, a2, a3: Corner radius center distance θ1, θ2, θ3: Skirt inner surface inclination angle

In order to achieve the above object of the present invention, a panel for a cathode ray tube has a panel and a funnel having a substantially rectangular effective screen portion and a skirt portion sealed at a sealing surface, and after an electron gun is inserted and sealed at the neck portion of the funnel, In the tube of a cathode ray tube exhausted into a high vacuum inside, the skirt portion of the panel has a thickness of the major axis so that the weight of the panel can be reduced to an optimal structure having an strength corresponding to the stress applied to the cathode ray tube tube by the high vacuum. It is thicker and the thickness of the diagonal axis is characterized by the thinnest.

The inclination angle from the reference point that is the innermost point of the sealing surface to the vertical line with respect to the sealing surface is such that the inclined angle of the shorter skirt inner surface is larger than the inclined angle of the skirt inner surface of the long axis, and the inclined angle of the skirt inner surface of the diagonal axis is formed the smallest. The object can be achieved, and furthermore, the effective screen portion of the panel having the inner radius extends to make the inner corner radius constant at the point where it is connected with the skirt portion and the corner radius from the center of the inner corner radius to the effective screen portion. The object of the present invention can be achieved even if the center distance is shorter than the corner radius center distance of the long axis and the corner radius center distance of the diagonal axis is the longest.

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

First, in Figs. 2 and 3, the stress distribution due to high vacuum, that is, the stress distribution due to external atmospheric pressure, is large or small, but the same pattern is used for the stress (a) of the short axis (Y). It was shown that the stress c of the diagonal axis Z is the smallest and the stress d acting on the corner portion of the panel 12 in the side view acts over the entire skirt portion 12 '.

Therefore, one embodiment of the present invention corresponds to the stress c of the diagonal axis Z in FIG. 3 to cover the entire length of the skirt portion from the effective screen portion so as to have a light weight and optimum strength for such a stress distribution. The thickness is formed thick, and as shown in Fig. 2, the thickness of the short axis Y is larger than the thickness of the long axis X.

4 shows what is considered as a component in accordance with the present invention. That is, as shown in Fig. 2, the panel 12 of the present invention has an effective screen portion E having a substantially rectangular shape and a skirt portion 12 'which forms a sealing surface 13 on the lower surface.

In FIG. 5 three embodiments are specifically illustrated using a partial cross section of panel 12.

In the first embodiment, the panel 12 of the present invention has a thickness (+1) of the short axis Y from the effective screen portion E having a substantially rectangular shape to the skirt portion 12 '. It is thicker than the thickness t2, and the thickness t3 of the diagonal axis Z is the thinnest, and the effective screen portion between the short axis Y and the diagonal axis Z and the major axis X and the diagonal axis Z is It is preferable that the thickness from E) to the sealing surface 13 of the skirt portion 12 'be changed almost continuously while satisfying the above-described thickness conditions, since it can prevent stress concentration.

As described above, the cathode ray tube panel is sealed with the funnel 14 on the sealing surface 13, and the electron gun is inserted into the neck portion and sealed, and then exhausted by a high vacuum formed as shown in FIGS. 2 and 3. And it is possible to reduce the weight and the optimal structure that can withstand the strength corresponding to the stress acting on the tube.

In addition, the cathode ray tube panel 12 according to another embodiment of the present invention has an innermost point of the sealing surface 13 as a reference point 13 ′ in FIG. 5, and is inward with respect to a vertical line with respect to the sealing surface 13. It is a method of changing the inclination angle of the inner surface of the skirt which is formed to be inclined. That is, in FIG. 5, the skirt inner surface inclination angle has the largest skirt inner surface inclination angle θ1 of the short axis Y as shown by the dotted line, and the skirt inner surface inclination angle θ3 of the diagonal axis Z as shown by the dashed-dotted line. ) Is the smallest, and as shown by the solid line, the inclination angle θ2 of the inner surface of the skirt of the long axis X is formed to be intermediate.

Such skirt inner surface inclination angles θ1, θ2, θ3 are usually formed at a constant inclination angle so that the molten glass can be easily removed from the mold after the molten glass is hardened from the mold in manufacturing the panel 12, that is, the glass processing. In the skirt inner surface inclination angle θ1 of the short axis Y and the skirt inner surface inclination angle θ2 of the long axis X is formed to be the inclination angle θ3 of the skirt inner surface of the diagonal axis Z. The lightest structure is also shown in the stress distribution of FIGS. 2 and 3. Even in this case, the angle of inclination of the inner surface of the skirt between the short axis (Y), the diagonal side (Z), and the long axis (X) and the diagonal axis (Z) may be changed almost continuously while satisfying the above conditions to prevent stress concentration. .

In addition, in the third embodiment of the present invention, the inner corner radius (i) at the point where the effective screen portion E of the panel 12 having the inner surface radius r is extended and connected to the skirt portion 12 'in FIG. r) is made constant and the corner radius center distance from the center of the inner surface corner radius r to the effective screen portion E is changed. That is, the corner radius center distance a1 of the short axis Y is the smallest, the corner radius center distance a3 of the diagonal axis Z is the longest, and the corner radius center distance a2 of the long axis X is medium. Is formed. Even in this case, it is possible to prevent the stress concentration by changing the center distance between the short axis (Y), the diagonal axis (Z), and the long axis (X) and the diagonal axis (Z) almost continuously while satisfying the above conditions. . In addition, by making the inner surface corner radius r 'and the outer surface corner radius R' constant, it is easy to manufacture a mold.

In this manner, as in FIG. 5, the lightest body is formed while corresponding to the stress distribution in FIGS. 2 and 3, similarly to the first embodiment.

According to the configuration and operation of the cathode ray tube panel according to the embodiments of the present invention, the skirt portion 12 from the effective screen portion (E) with the optimum strength for the stress distribution formed by the atmospheric pressure according to the most lightweight and high vacuum By forming the thickness up to ') over the entire area of the effective screen portion E having a substantially rectangular shape, the stress acting by atmospheric pressure is most reduced, and the maximum strength is achieved without stress concentration. The weight can be prevented, the material cost can be reduced, and the cost can be reduced even in the mold manufacturing surface.

Although one example of the present invention has been described above, the present invention is not limited thereto, and those skilled in the art will be able to easily make various applications and modifications from the appended claims.

Claims (3)

In a panel for cathode ray tubes having an effective screen portion E and a skirt portion 12 'and a sealing surface 13 to be sealed, a short axis Y of the skirt portion 12' of the panel 12 is provided. A panel for cathode ray tubes, characterized in that the thickness t1 is larger than the thickness t2 of the major axis X, and the thickness t3 of the diagonal side Z is the smallest in comparison with the thickness of the short axis and the major axis. The inclination angle of the skirt inner surface of the short axis Y in the inclination angle from the reference point 13 ', which is the innermost point of the sealing surface 13, to the vertical line with respect to the sealing surface 13, A panel for cathode ray tubes, wherein the skirt inner surface inclination of the long axis X is larger than θ2 and the skirt inner surface inclination angle θ3 of the diagonal axis Z is formed to be the smallest. The inner surface radius (R) of the panel (12) having the inner surface radius (r) extends to make the inner corner radius (r) constant at the point where it is connected to the skirt portion (12 '). The corner radius center distance from the center of the inner corner radius r to the effective screen portion E is such that the corner radius center distance a1 of the short axis Y is smaller than the corner radius center distance a2 of the long axis X. , Panel for cathode ray tube, characterized in that the longest center distance (a1, a2, a3) of the corner radius of the diagonal axis (Z).