KR20000014227A - Cathode ray tube of flat type - Google Patents

Abstract

PURPOSE: A cathode ray tube of a flat type is provided to reduce a thickness of a panel and improve a characteristic of a cathode ray tube by forming flatly a center portion of a panel. CONSTITUTION: A cathode ray tube comprises: a panel(1) fixed on a front face of a funnel(2) having a neck portion(5); and a shadow mask(4) fixed at a state having a constant distance by a rail(8) on a rear face of the panel. The remaining portion except for the funnel fixation portion of the panel is flatly projected to a front direction in comparison with the funnel fixation portion. The rail is combined to the rear face of the funnel fixation portion of the panel and the rear face of the remaining portion except for the funnel fixation portion of the panel.

Description

Flat cathode ray tube

The present invention relates to a planar cathode ray tube, and more particularly, to a planar cathode ray tube which improves the characteristics of a planar cathode ray tube while preventing warpage of the panel.

In general, a planar cathode ray tube generally uses an in-line electron gun, and in the planar cathode ray tube using the inline electron gun, three electron beams of red (R), green (G), and blue (B) are horizontally positioned. Because they are arranged side by side, the deflection yoke of a planar cathode ray tube employs a self-convergence using a non-uniform magnetic field in order to converge three electron beams in one place on the fluorescent surface.

As shown in FIGS. 1A to 2, the planar cathode ray tube has a panel 1 mounted on the front side of the cathode ray tube, and red (R), green (G) and blue ( A fluorescent mask 3 coated with the phosphor of B), a shadow mask 4 having a color discrimination function of the electron beam a incident on the fluorescent surface 3 behind the fluorescent surface 3, and the panel 1 An electron gun (6) mounted to the rear of the funnel (2) installed to maintain the interior in a vacuum state, and inside the tubular neck (5) retracted to the rear of the funnel (2) for firing an electron beam (6) ) And a deflection yoke (7) provided to surround the outer side of the funnel (2) and to deflect the electron beam in a horizontal or vertical direction.

On the rear surface of the panel 1, the shadow mask 4 is maintained at a constant distance from the panel 1, and a rail 8 supporting the shadow mask 4 is fusion-bonded, and an outer circumferential portion of the panel 1 is The reinforcing band 9 is provided to be wrapped along the outer circumference, and the reinforcing band 9 is inserted into and fastened to the inner surface of the monitor chassis (not shown) so as to couple and fix the cathode ray tube to the monitor chassis. The lug 10 in which the fastening hole 11 is formed is formed.

The planar cathode ray tube of this structure is a panel 1 in which the fluorescent surface 3 is formed on the inner surface of the planar cathode ray tube and a funnel 2 coated with graphite having electrical conductivity on the inner side thereof. Combined.

When an image signal is input to an electron gun 6 mounted to emit an electron beam in the tubular neck portion 5 which is retracted behind the funnel 2, an electron beam is emitted from the electron gun 6, i.e., the electron beam Controlled, accelerated and focused while passing through each electrode of the electron gun 6 and then passed through the shadow mask 4 in a state deflected by a deflection yoke 7 located outside of the funnel 2 to the panel 1 The image is reproduced by colliding with the fluorescent surface 3 applied to the inner surface and causing the phosphor to emit light.

In this case, in the shadow mask 4, three in-line electron beams corresponding to red (R), green (G), and blue (B) emitted from the electron gun 6 are crossed with each other around the green in the shadow mask 4. A color screening function is performed to cause the fluorescent screens 3 of red (R), green (G), and blue (B) of the screen to emit light.

In this case, since the rail 8 is fusion-bonded to the rear surface of the panel 1, the shadow mask 4 is supported by the rail 8 while maintaining a constant distance from the inner surface of the panel 1.

As described above, the planar cathode ray tube combined with the panel 1 and the funnel 2 and the respective components is coupled to the monitor chassis (not shown).

That is, when the exhausting process is performed after the funnel 2 is coupled to the rear surface of the panel 1, the inside of the funnel 2 is in a vacuum state, and when the exhausting process of making the inside of the funnel 2 in a vacuum state is completed. A reinforcing band 9 having a plurality of lugs 10 is formed to surround the outer circumference of the panel 1, and each lug 10 of the reinforcing band 9 is positioned at each corner of the panel 1. After applying a force to the reinforcing band (9), and then tighten the reinforcing band (9) to the outer peripheral portion of the panel (1).

Fastening holes 11 formed in the respective lugs 10 after positioning the cathode ray tube so that each lug 10 contacts the inner surface of the monitor chassis while the reinforcing band 9 is fixed to the panel 1. As the panel 1 is coupled to the monitor chassis by fastening a screw into the screw, the cathode ray tube is fixed to the monitor chassis.

However, the conventional planar cathode ray tube has a flat planar shape, so in the exhaust process of making the funnel coupled to the back of the panel into a vacuum state during the manufacturing process of the planar cathode ray tube, the inside of the funnel is in a vacuum state and the outside is at atmospheric pressure, so the pressure difference As a result, as shown in FIG. 3A, the panel is recessed into the planar cathode ray tube after the evacuation process (a), that is, the panel is deformed, thereby adversely affecting the characteristics of the planar cathode ray tube.

In addition, when the reinforcing band is installed along the outer circumference of the panel to fix the lug on the outer circumference of the panel after completion of the exhaust process, the reinforcing band is returned to its original position when the reinforcing band is stretched by applying force to the outer circumference of the panel. Since the panel is tightened, as the band deformed by the reinforcing band (b) is added to the panel deformed in the evacuation process, as shown in FIG. 3b, the deformation of the panel is further increased.

The present invention has been made in order to solve the above problems, and to change the panel shape of the planar cathode ray tube to return the panel recessed into the planar cathode ray tube during the exhaust process of the planar cathode ray tube manufacturing process to its original position The purpose is to prevent deformation and breakage of the panel, and to reduce the manufacturing cost of the planar cathode ray tube.

In order to achieve the above object, the present invention is a panel is fixed to the front of the funnel having a neck, the shadow mask is fixed to the rear of the panel spaced apart by a predetermined interval, so as to surround the outer peripheral portion of the panel In the reinforcing band is installed, the planar cathode ray tube is provided, characterized in that the remaining portion other than the funnel fixing portion of the panel protrudes flatly forward than the funnel fixing portion.

Figure 1a is a schematic structural diagram for explaining the structure of a general planar cathode ray tube.

1B is a front view showing a planar cathode ray tube from the front;

2 is a cross-sectional view showing a conventional panel structure of a flat cathode ray tube.

Figure 3a is a cross-sectional view showing a state in which the panel is deformed during the exhaust process of the planar cathode ray tube.

Figure 3b is a cross-sectional view showing a state in which the panel is deformed when the band is coupled to the panel of the planar cathode ray tube.

4 is a cross-sectional view showing a panel structure of the present invention flat cathode ray tube.

Figure 5a is a cross-sectional view showing a state in which the panel is deformed during the exhaust process of the planar cathode ray tube.

Figure 5b is a cross-sectional view showing a state in which the reinforcing band is coupled to the panel of the planar cathode ray tube.

Figure 6 is another embodiment showing the panel structure of the present invention flat cathode ray tube.

Figure 7a is a cross-sectional view showing a state in which the panel is deformed during the exhaust process of the planar cathode ray tube.

Figure 7b is a cross-sectional view showing a state in which the reinforcing band is coupled to the panel of the planar cathode ray tube.

Explanation of symbols for main parts of the drawings

101: first side 102: second side

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 4 to 5b.

Since the structure of the planar cathode ray tube has been mentioned in the conventional configuration, overlapping portions thereof will be omitted, and only the same structure will be given the same reference numeral as in the prior art.

Figure 4 is a cross-sectional view showing a panel structure of the present invention flat cathode ray tube, Figure 5a is a cross-sectional view showing a state in which the panel is deformed during the exhaust process of the flat cathode ray tube, Figure 5b is a reinforcing band is coupled to the panel of the flat cathode ray tube It is sectional drawing which showed the state.

According to the present invention, a panel (1) and a funnel (2) having a tubular neck (5) which is retracted to the rear of the panel (1) are retracted. 3) a shadow mask 4 having a color discriminating function of an electron beam incident to the light beam is provided, and a rail for maintaining a constant distance between the panel 1 and the shadow mask 4 on the rear surface of the panel 1 8) is coupled to the outer periphery of the panel (1) is provided so as to surround the reinforcing band (9) formed with a plurality of lugs (10).

The remaining portion of the panel 1, except for the fixed portion of the funnel 2, is formed to protrude more forward than the fixed portion of the funnel 2.

The other part of the panel 1 protruding forward, that is, the remaining portion of the panel 1 except for the fixed portion of the funnel 2, is the first surface 101, and the fixed portion of the panel 1 is formed of the first side 101. It is called the 2nd surface 102, and the said 1st, 2nd surface 101 and 102 are formed in the flat plate.

A fluorescent surface 3 coated with a phosphor is formed on the rear surface of the first surface 101.

A rail 8 is fusion-bonded to the fixed portion of the panel 1, that is, the rear surface of the second surface 102, and the height h of the rail 8 is the rear surface of the first surface 101. It is formed so as to be lower than the distance Q from the fluorescent surface 3 applied to the shadow mask 4.

The distance d from the fluorescent surface 3 of the panel 1, ie, the rear surface of the first surface 101 to the rear surface of the second surface 102, is the distance from the fluorescent surface 3 to the shadow mask 4. Q), and if the distance d from the rear surface of the first surface 101 to the rear surface of the second surface 102 is the distance from the fluorescent surface 3 to the shadow mask 4 If it is longer than Q, the rail 8 supporting the shadow mask 4 cannot be fixed while maintaining the distance Q from the fluorescent surface 3 to the shadow mask 4.

That is, since the distance Q from the fluorescent surface 3 to the shadow mask 4 is designed in advance, if the distance Q is smaller than the distance d from the rear surface of the first surface 101 to the rear surface of the second surface 102. The rail 8 cannot be fixed.

As the rail 8 is fused to the rear surface of the second surface 102 of the panel 1, the distance Q from the fluorescent surface 3 to the shadow mask 4 is reduced from the rear surface of the first surface 101. Since the distance d to the rear surface of the second surface 102 and the height h of the rail 8 are combined, the height limitation of the rail 8 is eliminated, thereby minimizing the height h of the rail 8. As it is possible to reduce the residual stress of the panel (1).

The rear width (e) of the second face 102 of the panel 1, ie the rear width of the fixing part of the funnel 2, means that the rail 8 and the funnel 2 have a second face 102 of the panel 1. The width (w) of the rail (8) and the thickness (t) of the funnel (2) is formed to be wider than the sum so that it can be easily coupled to.

If the width (e) of the rear surface of the second surface (102), the width (w) of the rail (8) and the thickness (t) of the funnel (2) are the same, it is disadvantageous in the thermal process during the planar cathode ray tube manufacturing process. can do.

In another embodiment of the present invention, as shown in Figure 6 to 7b, the remaining portion of the panel 1, except for the fixed portion of the funnel (2) is formed to protrude flatly forward than the fixed portion of the funnel (2) The remaining portion of the panel 1 except for the fixed portion of the funnel 2 is the first surface 101, and the fixed portion of the panel 1 is called the second surface 102, The first and second surfaces 101 and 102 are formed of flat plates.

The rail 8 is fusion-bonded to the remaining portion of the panel 1 except for the fixed portion of the funnel 2, that is, the rear surface of the first surface 101, and the height h of the rail 8 is determined by the first portion. It is formed to be equal to the distance Q from the fluorescent surface 3 applied to the rear surface of the surface 101 to the shadow mask 4, the fixing portion of the panel 1, that is, the second surface ( The back width e of the 102 is formed to be wider than the thickness t of the funnel 2 so that the funnel 2 can be smoothly coupled to the back of the second face 102 of the panel 1. .

The distance d from the fluorescent surface 3 of the panel 1, ie, the rear surface of the first surface 101 to the rear surface of the second surface 102, is the distance from the fluorescent surface 3 to the shadow mask 4. Q), and if the distance d from the rear surface of the first surface 101 to the rear surface of the second surface 102 is the distance from the fluorescent surface 3 to the shadow mask 4 When it is longer than Q, the rail 8 supporting the shadow mask 4 cannot be fixed while maintaining the distance d between the end surfaces of the rails 8 from the rear surface of the first surface 101.

That is, since the distance Q from the fluorescent surface 3 to the shadow mask 4 is designed in advance, if the distance Q is smaller than the distance d from the rear surface of the first surface 101 to the rear surface of the second surface 102. The rail 8 cannot be fixed.

The operation of the present invention configured as described above is as follows.

First, the panel 1 of the planar cathode ray tube protrudes with the remaining portion except for the fixed portion of the funnel 2 protruded forward than the fixed portion of the funnel 2, and the funnel 2 of the panel 1. The remaining part except the fixing part is called the first face 101, and the fixing part of the funnel 2 of the panel 1 is called the second face 102.

The rear surface of the first surface 101 of the panel 1 because the rail 8 is directly fusion bonded at a high temperature (about 440 degrees) using frit glass on the rear surface of the second surface 102 of the panel 1. And the distance between the shadow mask 4, that is, the distance Q from the fluorescent surface 3 to the shadow mask 4, is kept constant by the rail 8.

As such, when the exhaust process proceeds to vacuum the inside of the funnel 2 while the rail 8 and the funnel 2 are coupled to the second surface 102 of the panel 1, the panel 1 ), As shown in FIG. 5A, a deformation occurs in the planar cathode ray tube by the amount of exhaust off (a).

As described above, when the reinforcing band (9) having a plurality of lugs (10) is coupled to the outer peripheral portion of the panel (1) in the state of being depressed into the planar cathode ray tube by the exhaust process, that is, to the reinforcing band (9) After applying the force, each lug 10 of the reinforcing band 9 is positioned at each corner of the panel 1, and then the reinforcing band 9 is coupled to surround the outer periphery of the panel 1. As 1) is returned by the panel recovery amount c as shown in FIG. 5A, the panel 1 returns to the initial state.

That is, when the reinforcing band 9 is coupled to the outer circumference of the second surface 102 of the panel 1 while the first surface 101 of the panel 1 is recessed into the inside of the planar cathode ray tube, the reinforcing band 102 ) Is applied below the center line of the recessed panel 1, so that the recessed portion of the panel 1 is bent toward the recessed opposite side, so that the first surface 101 of the panel 1 is The panel 1 is returned closer to the initial state as it is returned by the panel recovery amount c after the reinforcing band 9 is fastened.

Then, each lug 10 of the reinforcing band 9 is brought into contact with the inner surface of the monitor chassis (not shown), and then screwed into the fastening holes 11 of the lugs 10, respectively, so that the planar cathode ray tube Is fixed to the monitor chassis.

As described above, when the planar cathode ray tube is fixedly coupled to the monitor chassis, the electron beam emitted from the electron gun 6 into which the image signal is input is mounted in the neck portion 5 of the funnel 2 while passing through the shadow mask 4. Color sorting is performed to impinge on the fluorescent surface 3 applied to the inner surface of the panel 1 so as to emit the phosphors, so that the image is reproduced.

At this time, the height h of the rail 8 fused to the rear surface of the second surface 102 of the panel 1 is formed to be lower than the distance Q from the fluorescent surface 3 to the shadow mask 4. Therefore, the height h of the rail 8 depends on the distance Q from the fluorescent surface 3 to the shadow mask 4.

In other words, the distance Q from the fluorescent surface 3 to the shadow mask 4 is the distance d from the rear surface of the first surface 101 to the rear surface of the second surface 102 and the rail 8. Since the height h of) is equal to the sum (Q = d + h), the height h of the rail 8 can be minimized as the height h of the rail 8 is not limited.

Accordingly, the amount of the frit glass for fusion bonding the rail 8 to the rear surface of the second surface 102 of the panel 1 is also minimized, so that the rail 8 is formed using the frit glass in the panel 1. Since the residual stress generated inside the panel 1 can be minimized due to the difference in coefficient of thermal expansion between the panel 1 and the frit glass during fusion bonding, the breakage of the panel 1 is reduced during the planar cathode ray tube manufacturing process. Can be.

On the other hand, the width (e) of the rear surface (e) of the second surface (102) of the panel (1) is formed to be wider than the sum of the thickness (t) of the rail (8) and the width (w) of the funnel (2). The rail 8 and the funnel 2 are easily coupled to the face 102.

6 to 7b, the panel 1 of the planar cathode ray tube has a portion other than the fixed portion of the funnel 2 in front of the fixed portion of the funnel 2. It protrudes in a flat state, and the rest of the panel 1 except for the fixing portion of the funnel 2 is called the first surface 101, and the fixing portion of the panel 1 is the second surface. It is referred to as (102).

Since the rail 8 is directly fused and bonded to the other part of the panel 1 except for the fixing part of the funnel 2, that is, the first surface 101 by using frit glass, the inner surface of the panel 1 The distance Q between the shadow masks 4, ie, the distance Q from the fluorescent surface 3 applied on the back surface of the first surface 101 of the panel 1 to the shadow mask 4, is constant by the rail 8. Is maintained.

In this way, the funnel 2 in a state in which the rail 8 is fusion-bonded to the first surface 101 of the panel 1 and the funnel 2 is coupled to the rear surface of the second surface 102 of the panel 1. As the exhaust process proceeds to vacuum the inside of the panel 1, the first surface 101 of the panel 1 is deformed into the planar cathode ray tube as much as the exhaust off amount a as shown in FIG. 7A. .

As described above, when the reinforcing band 9 in which the plurality of lugs 10 are formed is coupled to the outer circumference of the second surface 102 of the panel 1 which is recessed into the planar cathode ray tube by the exhaust process, that is, The reinforcing band 9 is wrapped around the outer periphery of the panel 1 so that each lug 10 of the reinforcing band 9 is positioned at each corner of the panel 1 after the force is applied to the reinforcing band 9. Since the panel 1 is combined, the panel 1 is returned by the panel recovery amount c as shown in FIG. 7B.

That is, when the reinforcing band 9 is coupled to the outer circumference of the second surface 102 of the panel 1 in a state where the first surface 101 of the panel 1 is recessed into the inside of the planar cathode ray tube, the reinforcing band 9 ) Is applied below the center line of the recessed panel 1, so that the recessed portion of the panel 1 is bent toward the recessed opposite side, so that the first surface 101 of the panel 1 is The panel 1 is returned closer to the initial state as it is returned by the panel recovery amount c after the reinforcing band 9 is fastened.

Then, each lug 10 of the reinforcing band 9 is brought into contact with the inner surface of the monitor chassis (not shown), and then screwed into the fastening holes 11 of the lugs 10, respectively, so that the planar cathode ray tube Is fixed to the monitor chassis.

As described above, when the planar cathode ray tube is fixedly coupled to the monitor chassis, the electron beam emitted from the electron gun 6 into which the image signal is input is mounted in the neck portion 5 of the funnel 2 while passing through the shadow mask 4. Color sorting is performed to impinge on the fluorescent surface 3 applied to the inner surface of the panel 1 so as to emit the phosphors, so that the image is reproduced.

At this time, the height h of the rail 8 fused to the rear surface of the first surface 101 of the panel 1 is formed to be equal to the distance Q from the fluorescent surface 3 to the shadow mask 4. Therefore, the height h of the rail 8 depends on the distance Q from the fluorescent surface 3 to the shadow mask 4.

In addition, since the rear surface width e of the second surface 102 of the panel 1 is formed to be wider than the thickness t of the funnel 2, the funnel 2 is formed on the second surface of the panel 1. 102) It is easily coupled to the rear surface.

As described above, the present invention is formed so that the panel center of the cathode ray tube protrudes in the front of the cathode ray tube more flat than the outer surface, the reinforcing band in the outer peripheral portion of the panel in which the center is recessed inward in the exhaust process during the cathode ray tube manufacturing process In other words, the panel is returned to its original position as the recessed portion of the panel is bent to the opposite side because the reinforcing band is applied downward from the center line in which the reinforcing band is applied. Accordingly, there is an effect of improving the characteristics of the cathode ray tube.

In addition, the panel of the cathode ray tube is formed in two stages, that is, the center portion protrudes in a flat state in front of the cathode ray tube, thereby minimizing the off-center of the panel during the exhausting process and reducing the thickness of the panel. As the material cost is reduced, the manufacturing cost of the cathode ray tube may be reduced, and a thermal process for fusion bonding of the rail to the panel may be easily performed during the cathode ray tube manufacturing process.

In addition, in order to maintain a constant distance between the inner surface of the panel and the shadow mask, it is possible to minimize the height of the rail fused using frit glass on the back of the panel, thereby reducing the material cost as well as reducing the amount of the rail. Minimizing the residual stress inside the panel by the difference between the panel and the frit glass and the thermal expansion coefficient, so that the thermal process is easily performed during the cathode ray tube manufacturing process, thereby preventing the panel from being damaged.

Claims (9)

In the planar cathode ray tube of which a panel is fixed to the front of the funnel having a neck portion, and a shadow mask is fixed to the rear of the panel at a predetermined interval by a rail, A planar cathode ray tube, characterized in that the remaining portion of the panel except for the funnel fixing portion protrudes forwardly flatter than the funnel fixing portion. The method of claim 1, Flat cathode ray tube, characterized in that the rail is fusion-bonded to the rear of the panel fixed funnel. The method according to claim 1 or 2, And a height (h) of the rail is lower than a distance (Q) from the panel fluorescent surface to the shadow mask. The method according to claim 1 or 2, And a distance (d) from the panel fluorescent surface to the rear side of the funnel fixing portion is shorter than the distance (Q) from the panel fluorescent surface to the shadow mask. The method according to claim 1 or 2, A flat cathode ray tube, characterized in that the rear width (e) of the funnel fixing portion is formed to be wider than the width (w) of the rail and the thickness (t) of the funnel. The method of claim 1, Flat cathode ray tube, characterized in that the rail is fusion-bonded to the rear of the remaining portion other than the panel fixed funnel. The method according to claim 1 or 6, And a height (h) of the rail is equal to the distance (Q) from the panel fluorescent surface to the shadow mask. The method according to claim 1 or 6, And a distance (d) from the panel fluorescent surface to the rear surface of the funnel fixing portion is shorter than the distance (Q) from the panel fluorescent surface to the shadow mask. The method according to claim 1 or 6, A flat cathode ray tube, characterized in that the rear width (e) of the funnel fixing portion is formed to be wider than the thickness (t) of the funnel.