KR100766191B1 - Curvature structure of cathode ray tube panel - Google Patents

Abstract

The present invention relates to a panel curvature structure of a cathode ray tube, by changing the curvature change of the inner surface of the panel defining the curvature of the shadow mask appropriately to prevent the deformation or vibration of the shadow mask due to the external impact or vibration of the cathode ray tube to prevent mis-landing It is possible to provide a high quality color cathode ray tube by preventing the inner pin or inner barrel phenomenon in which the screen is distorted on the screen.

The panel curvature structure of the present invention for realizing this, the curvature radius (Ryc _i ) in the Y direction at the center of the inner surface of the panel having an outer surface curvature radius of 30,000R or more, and the curvature radius (Rye _i ) in the Y direction of the edge portion And the radius of curvature Ryh _{i in} the middle of the center portion and the edge portion in the Y direction satisfies the ranges of Ryc _i / Ryh _i = 1.01 to 1.10 and Ryh _i / Rye _i = 0.95 to 1.05.

Cathode Ray Tube, Shadow Mask, Vibration, Deflection, Miss Landing, Inner Pin, Inner Barrel

Description

CURVATURE STRUCTURE OF CATHODE RAY TUBE PANEL}             

1 is a schematic configuration diagram of a typical cathode ray tube.

2 is a view for explaining the structure of the shadow mask.

3 is a detailed structural diagram of the spring.

4 is a detailed structural diagram of a frame.

5 is a cross-sectional schematic diagram of a cathode ray tube panel.

6 is a view for explaining the curvature structure of the cathode ray tube panel.

7 is an explanatory diagram showing generation of an electron beam landing error according to the prior art;

8 shows a normal landing state of an electron beam,

8A is a stripe type fluorescent surface state diagram;

8B is a dot type fluorescent surface state diagram;

9 shows a mis-landing state of the electron beam,

9A is a stripe type fluorescent surface state diagram;

9B is a dot type fluorescent surface state diagram;

10 is a schematic diagram for showing the inner pin (inner barrel) phenomenon on the screen.                 

<Explanation of symbols for main parts of the drawings>

1: cathode ray tube 2: panel

3: funnel 5: electron beam

7: fluorescent surface 7a: BM

7b: phosphor 8: shadow mask

9: frame

The present invention relates to a color cathode ray tube, and more particularly, to a panel that forms a screen when reproducing an image of a cathode ray tube, the panel curvature in the X and Y directions is appropriately set to improve impact resistance and at the same time, the inner pin phenomenon is improved. It relates to a panel curvature structure of a cathode ray tube that can be prevented.

Referring to the configuration of a general color cathode ray tube, as shown in FIG. 1, a panel 2 mounted on a front surface of the cathode ray tube 1 and a fluorescent surface 7 having a predetermined light emitting role on an inner side thereof is formed, and the panel 2 ), A deflection yoke fused by frit glass to keep the inside of the cathode ray tube in a vacuum state, and a deflection yoke for deflecting the electron beam 5 incident on the fluorescent surface 7 up / down / left / right ( 13, an electron gun 6 mounted to the rear neck 4 for radiation of the electron beam 5, a frame 9 supported inside the panel 2, and the frame 9 A shadow mask (8) in which a slot or a dot opening is arranged so that the electron beam (5) passes through, and the frame (9) is mounted on the inner side of the panel (2). It consists of a spring (10) fixed to the pin (11).

In the drawing, reference numeral 12 denotes an inner shield for shielding an external magnetic field, and is coupled to the frame 9 by a fixing spring 14.

Let us look at the structure of some of the main components in more detail.

First, as shown in FIGS. 5 and 6, the panel 2 has a curvature radius R _OUT having a flat surface or a radius of 30,000 R or more, and the inner surface has a predetermined curvature in the X, Y, and diagonal axes. There the radius (R _in) to have, and the radius of curvature of the radius of curvature Ryc _i, and a center portion and an edge portion mid-point of the central portion of the Y-axis can be divided into Ryh _i and edge of the radius of curvature Rye _i, Ryc _i / Ryh _i The ratio of 0.85 to 1.0 is formed, and the ratio of Ryh _i / Rye _i is formed to 0.5 to 1.0.

As shown in FIG. 2, the shadow mask 8 includes a plurality of holes 8a having a plurality of holes for color discrimination, and a pair of long side skirts 8b extending down from the holes 8a. ) And another pair of short side skirt portions 8c, and the edges between the perforations 8a and the skirt portions 8b and c, and each skirt portion has beads 8d for reinforcing the strength of the shadow mask. Is formed. Further, in order to improve the formability of the shadow mask, narrow skirt holes 8e are formed in each skirt portion, and corner holes 8f are formed in the corners. The shadow mask 8 constituting this structure is welded to the inside or outside of the side wall portion of the frame 9.

As shown in FIG. 4, the frame 9 has a pair of long sides 9a parallel to the long axis X-X 'of the cathode ray tube 1 and a pair of short sides parallel to the short axis Y-Y'. In order to prevent the bottom portion 9h formed of the portion 9b, the side wall portion 9c extending from each of the long side portion and the short side portion, and the electron beam reflected by the collision of the electron beam on the opening portion 9g side, cannot be directed toward the fluorescent surface. The bending portion 9d was formed to extend from the frame bottom portion 9h and to have a constant angle with the frame long side portion or the short side portion. The opening portion 9g is provided for the passage of an electron beam that emits a fluorescent surface. In addition, an inner shield assembly hole 9e for assembling the inner shield 12 using the fixing spring 14 is formed at the long side portion or the short side portion of the frame, and when the shadow mask is welded, the shadow is formed on the frame. The side wall bent portion 9f is formed in the side wall portion of the frame so that the mask can be easily inserted.

The support spring 10 for supporting the frame 9 on the inner surface of the panel 2 is coupled to the welding portion 10a welded to the frame and the stud pins 11 formed on the inner surface of the panel as shown in FIG. 3. Combination portion 10c is formed with a coupling hole (10d) is formed, and the connecting portion (10b) connecting the welding portion and the coupling portion. The welding portion 10a of the support spring is fixed to the frame by a plurality of welding points 10e.

In the general color cathode ray tube constituting this configuration, when an external shock or vibration caused by the speaker is applied to the cathode ray tube, the impact or vibration is transmitted to the support spring 10 through the stud pin 11 of the panel 2, which is continued. It is delivered to the shadow mask 8 through the frame (9).                         

When the shadow mask 8 vibrates due to such vibration transmission, the position of the mask is changed. Therefore, as shown in FIG. 7, the impact position of the electron beam 5 passing through the hole of the mask and reaching the fluorescent surface is the original 'P1'. Will be changed to 'P2'. That is, mis-landing is caused by the distance of P1-P2.

As a result, this is not exactly blown to the center of the phosphor 7b applied in the stripe form (Fig. 8A) or the dot form (Fig. 8B) between the BM films 7a as shown in Fig. 8, and shown in Figs. 9A and 9B. As such, it causes mis-landing that is off-centered.

As described above, the deformation of the shadow mask 8 generated by external impact or vibration is directly affected by the radius of curvature of the mask, and the curvature of the shadow mask is affected by the curvature of the inner surface of the panel. In order for the arrangement of the electron beams to be formed uniformly, since the shadow mask must be kept at a constant distance from the inner surface of the panel, the curvature of the shadow mask changes, but the basic curvature shape depends on the curvature of the inner surface of the panel.

By the way, the curvature shape of the conventional inner surface of a panel is formed in the direction from which a curvature radius becomes large from the center part to the edge part. That is, as shown in Figure 5, the radius of curvature (Rout) of the outer surface of the panel is made of infinity or a plane of 30,000 R or more as the cathode ray tube is planarized, the radius of curvature of the inner surface is Rxc _i , Y axis is Ryc _i and the diagonal axis is Rd _In terms of _i , Rxc _i , Ryc _i , and Rd _i all use the same single R.

In terms of curvature of the inner surface of the panel, the curvature radius Ryc _i in the Y direction of the center of the panel and the curvature radius Rye _{i in} the Y direction of the edge and the middle point of the center and the edge of the panel, i.e., L / 2 from the center of the panel inner surface It can be expressed by the radius of curvature Ryh _i in the Y direction of the corresponding point. That is, it can be represented by the radius of curvature of the Y direction that changes when moving toward the edge from the center.

The curvature radius change in the Y direction directly affects the curvature of the shadow mask. That is, the radius of curvature in the Y direction should be smaller as it goes from the center to the edge portion, so that the change in the radius of curvature of the shadow mask becomes larger or equally formed toward the edge portion. The radius of curvature of the inner surface of the panel used for the planar cathode ray tube having a flat outer surface is 0.85 to 1.0 for Ryc _i / Ry _y and 0.5 to 1.0 for Ryh _i / Rye _i , so the ratio of the radius of curvature of the shadow mask is It also tends to grow from the center to the edge. Therefore, the curvature of the shadow mask becomes more flat, so that the deformation of the shadow mask is easily caused by external shock or vibration applied to the cathode ray tube, and the deformation of the shadow mask causes mislanding, and the brightness by the mislanding The problem of deterioration and deterioration of color purity occurs.

The mislanding generated by the vibration of the shadow mask will be described in more detail with reference to FIGS. 7 to 9.

In FIG. 7, 'M1' represents a state in which there is no vibration or deformation of the shadow mask 8, that is, an original state, and 'M2' represents a state in which the shadow mask 8 vibrates to be out of its original position or deformation occurs. Indicates the state. The electron beam passing through the shadow mask without vibration or deformation hits 'P1', and the landing state change of the electron beam is shown in FIGS. 8 and 9.

That is, the center of the electron beam 5 passing through the shadow mask in the state where there is no vibration or deformation of the shadow mask 8 is a stripe (FIG. 8A) or a dot (FIG. 8B) formed of the phosphor 7b as shown in FIG. Coincides with the center of Therefore, there is no color shift, and no decrease in luminance due to mislanding occurs.

However, the center of the electron beam passing through the shadow mask in the state where the shadow mask 8 vibrates or deforms is shifted from the center of the stripe (FIG. 9A) or dot (FIG. 9B) formed of the phosphor 7b as shown in FIG. The phosphors of different colors are emitted. That is, there was a problem that mislanding occurs.

The present invention has been proposed to improve the above-mentioned conventional problems, and provides an inner surface curvature of the panel which is advantageous for shock or vibration, thereby minimizing deformation or vibration of the shadow mask, thereby preventing mis-landing of the electron beam. There is this.

The object is that the radius of curvature Ryc _i in the Y direction at the center of the inner surface of the panel having a curvature of 30,000 R or more, the radius of curvature Rye _{i in} the Y direction of the edge portion, and the Y of the middle portion of the center portion and the edge portion. The curvature radius Ryh _{i in the} direction can be achieved through the panel curvature structure of the cathode ray tube, which satisfies the range of Ryc _i / Ryh _i = 1.01 to 1.10 and Ryh _i / Rye _i = 0.95 to 1.05. .

Hereinafter, the present invention will be described in detail.

The structural feature of the cathode ray tube according to the present invention is that in designing the radius of curvature of the inner surface of the panel, the ratio of Ryc _i / Ryh _i satisfies 1.01 to 1.10 and the ratio of Ryh _i / Rye _i satisfies 0.95 to 1.05. Since the structure of the cathode ray tube is made in the same manner as in the prior art, detailed description thereof will be omitted.

In the above description, Ryc _i / Ryh _i is larger than 1.01, which means that the radius of curvature decreases toward the L / 2 point from the center of the panel inner surface. The smaller the radius of curvature, the greater the curvature, which means that the more the inner curvature of the panel bends away from the center, which means that the curvature of the shadow mask is equally applied to the external vibration or shock generated in the cathode ray tube. It means you can be strong.

Therefore, the larger the Ryc _i / Ryh _i is favorable to shock or vibration, but if this value exceeds 1.10, the slope becomes too sharp, which causes the panel thickness of the edge portion to become very large and the thickness difference of the center portion becomes severe.

This difference in panel thickness between the center and the edges reduces productivity, and in particular, Ryc _i / Ryh _i should be set to 1.10 or less, which causes damage in the furnace process where high temperature is applied in the manufacture of cathode ray tubes.

In addition, the ratio of the Y-direction curvature radius Ryhi of the L / 2 point and the Y-direction curvature radius Rye _i of the edge part is set to 1.01 to 1.10 similarly to the ratio of the center part and the L / 2 point, which is advantageous for shock or vibration characteristics. One characteristic to consider is the inner pin phenomenon.

Here, the inner pin phenomenon will be described with reference to FIG. 10.

Fig. 10 shows the front surface of the panel, i.e., the screen on which the image is reproduced, the outline represents the panel outline, the square in it represents the effective screen, and the lines therein are briefly depicting the cross hatch pattern as a kind of image. Lines a and b at the L / 2 point are bent toward the center with a curved line rather than a straight line. This bending phenomenon is called an inner pin phenomenon, and an inner barrel such as c and d is called an inner barrel phenomenon. The inner pin phenomenon is caused by the curvature of the inner surface of the panel, in particular, caused by the difference between the radius of curvature in the Y direction of the edge portion of the inner surface of the panel and the radius of curvature in the Y direction of the L / 2 point. That is, when Rye _i is smaller than Ryh _i , an inner pin phenomenon occurs. When Rye _i is larger than Ryh _i , an inner barrel phenomenon in which a line at L / 2 points toward an edge part occurs.

Thus, the impact or the need to form in order to favor the oscillation Ryh _i / _i between 1.01 to 1.10 Rye one, in such a case Ryh _i is greater than _i Rye inner fin phenomenon As described above applied to the outside of the tube Is generated.

In the end, Ryh _i / Rye _i is preferably set to 1.0, but it is possible to obtain satisfactory results by forming 0.95 to 1.05 in consideration of the error of 5%. If the difference between Ryh _i and Rye _i is more than 5%, it can be seen that the inner pin or inner barrel, which causes distortion of the image, can not be reproduced properly.

And, in order to satisfy a relationship of _i Ryc, Ryh _{i, i} between Rye Ryc _i / Rye _i must satisfy 0.96 to 1.16.

The present invention as described above, by appropriately changing the curvature change of the inner surface of the panel defining the curvature of the shadow mask to prevent the deformation or vibration of the shadow mask due to the external shock or vibration of the cathode ray tube to prevent the mislanding do.

In addition, at the same time it can be seen that it is possible to provide a high-quality color cathode ray tube by preventing the inner pin or inner barrel phenomenon that the screen is distorted on the screen.

Claims (1)

The inner surface on which the fluorescent surface formed by the R, G, and B phosphors is to be formed has a predetermined curvature and the outer surface is almost flat, a funnel forming one tube by being sealed to the rear end of the panel, and a neck portion of the funnel. A sealed electron gun, a deflection yoke for deflecting the electron beam so that the electron beam emitted from the electron gun can strike the entire surface of the fluorescent surface, a frame supported inside the panel, and a plurality of electron beams supported by the frame to pass through In a cathode ray tube comprising a shadow mask having an electron beam through hole arranged therein and a spring mounted on an outer surface to support the frame; The radius of curvature Ryc _i of the Y direction at the center portion of the inner surface of the panel, the radius of curvature Rye _i of the edge portion Y, and the radius of curvature Ryh _i of the middle portion of the center portion and the edge portion are Ryc. A panel curvature structure for a cathode ray tube, characterized by satisfying a range of _i / Ryh _i = 1.01 to 1.10 and Ryh _i / Rye _i = 0.95 to 1.05.

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