KR20020067293A - A Flat CRT And Manufacturing Method Thereof - Google Patents

Abstract

PURPOSE: A flat color cathode ray tube and a manufacturing method thereof are provided to simplify manufacture process by removing grinding process for making height of a mask support and a panel uniform. CONSTITUTION: A flat color cathode ray tube comprises a panel, a mask support(30) and a shadow mask. The mask support(30) is formed as short and long rails at the boundary of the inner surface of the panel. The shadow mask is welded to the mask support(30) for discriminating color of an electron beam from an electron gun. The rails(30) is made of metal having SUS446. At a first rolling step, roughness is formed at a shadow mask attaching surfaces of the rails(30) by a first roller. The roughness formed rails(30) are attached to the panel with frit glass. At a second rolling step, the height of the attached rails(30) are made as uniform to adjust Q value. After Q adjustment, the shadow mask is mounted on the rails(30).

Description

Flat color cathode ray tube and its manufacturing method {A Flat CRT And Manufacturing Method Thereof}

The present invention relates to a planar color cathode ray tube and a method for manufacturing the same, and more particularly, to a mask support to which a shadow mask is attached, to eliminate the grinding process that was performed to maintain a uniform height with the inner surface of the panel on which the phosphor is formed. The present invention relates to a flat color cathode ray tube and a method for manufacturing the same.

Figure 1 is a cross-sectional view showing the internal configuration of a typical flat color cathode ray tube.

As shown therein, the panel 10 of the flat color cathode ray tube is formed with a phosphor 11 on its inner side and a safety glass 12 on its outer side.

In the rear of the panel 10, a bulb-shaped funnel 20 is integrally fused to the panel 10 by frit glass while maintaining an internal vacuum pressure of about 10 ⁻⁷ . Or a vacuum vessel).

Moreover, the mask support body 30 which forms the shape of the rectangular frame comprised by the long and short axis is bonded to the inside of the said panel 10. As shown in FIG.

A shadow mask 40 having a slit or pore-shaped fine hole 41 is fixed to the mask supporter 30 in a tensioned state with respect to the mask supporter 30.

In addition, the neck 21 provided at the rear of the funnel 20 is equipped with an electron gun 23 for emitting an electron beam visualized in the drawing representation according to image signals of R, G, and B, and the neck 21 The deflection yoke 50 is formed on the outer side of the N-axis to deflect the electron beam 22 by forming a uniform magnetic field in the vertical / horizontal direction.

In the drawings, reference numeral 60 denotes an inner shield.

Accordingly, the electron gun 23 emits an electron beam 22 toward the phosphor 11 formed on the inner surface of the panel 10, and the emitted electron beam 22 emits a shadow mask located on the emitted path. The electron beam 22 (approximately 70%) is blocked by the 40, and the electron beam (approximately 30%) necessary for image reproduction is blocked by R, G, and B through the minute holes 41 formed in the shadow mask 40. It collides with the phosphor 11 and a color image is reproduced.

In the general planar color cathode ray tube having the above configuration, in particular, the process of installing the mask supporter 30 for the panel 10 will be described.

As shown in FIG. 2, the frit glass “F” prepared by combining the frit powder and the vehicle VehicHe is first filled in the internal space formed in the mask support 30, and then the mask support ( After placing 30) into the inside of the kiln, the frit glass is melted and crystallized at a temperature of about 440 ° C. to attach the mask support 30 to the panel 10.

However, at this time, as the frit glass is crystallized, a gap is formed between the mask support 30 and the panel 10, and thus the height of the inner surface of the panel 10 and the mask support 30 is uneven.

When the shadow mask 40 is attached in a state where the height of the mask supporter 30 is uneven as described above, the shadow mask 40 which functions as color screening may not fully perform its role, causing color bleeding. It becomes a factor.

Therefore, in order to make the height Q of the mask support 30 attached to the inner surface of the panel 10 uniform, a grinding process of mechanically and precisely polishing the upper surface of the mask support 30 is performed. . The fluorescent surface is formed on the inner surface of the panel on which the mask support is completed as described above through phosphor coating, exposure, and developing processes. The fixed shadow mask is stretched on the panel on which the fluorescent surface is formed to fix the shadow mask and the mask support of the panel by welding (ICM) to complete the pre-assembly work with the funnel. The cathode ray tube is completed by heat-sealing the funnel in the same manner as the general cathode ray tube and inserting an electron gun into the neck and performing vacuum treatment. After the expansion of the reinforcing band in order to cope with explosion-proof, and then quenched by shrinking to add the explosion-proof function to the panel tenon to complete the main work of the cathode ray tube process.

However, the method of achieving the desired Q value by sealing the panel and the mask supporter as described above is to consume a lot of consumable raw materials such as grindstone, coolant, etc., during the grinding process, which is burdensome in terms of manufacturing cost and manages the amount of abrasive wear every time. Maintaining the Q value is very difficult and quality fluctuation is a big problem.

In addition, a problem arises in that the abrasive powder and the mask support abrasive powder generated at the time of grinding become foreign materials, causing foreign matter defects in the process.

Therefore, the technical problem to be solved by the present invention, that is, the object of the present invention is to maintain a uniform height and the inner surface of the mask support and the panel generated during the process of attaching the mask support for the above-described flat color cathode ray tube The present invention provides a method for forming a gap between a planar color cathode ray tube and a mask support, which simplifies the manufacturing process by eliminating the grinding process.

1 is a cross-sectional view of a general flat color cathode ray tube to which the present invention is applied;

2 is an exemplary view illustrating a process of attaching a mask supporter to a conventional flat color cathode ray tube panel;

3 is a view showing a state in which a mask support is attached to the inner surface of the panel,

4 is a view showing a state in which the uneven portion is formed on the shadow mask attachment surface of the mask support according to the present invention,

5 is a process chart showing a processing step of the mask support applied in the present invention,

6 is an exemplary view showing a first rolling process for the mask support applied in the present invention,

7 is an exemplary view showing a second rolling process for the mask support applied in the present invention, and

8 is a side view showing a state in which the shadow mask is mounted on the mask support completed by the present invention.

*** Explanation of symbols for main parts of drawings ***

10: panel 20; funnel

21; neck 23; electron gun

30; mask support (rail) 31; partition wall

40; shadow mask 71,72; 1st, 2nd roller

"H"; Lumbar depth

"W"; Lumbar width

A first embodiment of the present invention for achieving the above object, a panel having a fluorescent surface formed on the inner surface, a mask support attached to the inner surface of the panel, and maintains a predetermined interval (Q) and the fluorescent surface and the mask support In the planar color cathode ray tube comprising a shadow mask attached to the at least one, wherein at least a portion of the shadow mask attaching surface of the mask support comprises a plurality of uneven parts.

A second embodiment of the present invention includes a panel having a fluorescent surface formed on an inner surface thereof, a mask support attached to an inner surface of the panel, and a shadow mask attached to the mask support while maintaining a predetermined distance Q from the fluorescent surface. In the method for manufacturing a flat color cathode ray tube, the attaching step of attaching the mask support to the inner surface of the panel formed with the fluorescent surface, and rotating the first roller relative to the shadow mask attaching surface of the attached mask support a plurality of uneven A first rolling step of forming a part; And a second rolling step of rotating the second roller to the formed concave-convex portion so as to make the interval between the inner surface fluorescent surface of the panel and the shadow mask attaching surface of the mask support constant.

It is preferable that the said 1st roller is provided with the tooth-shaped screw thread in the outer peripheral surface, and the outer peripheral surface of the said 2nd roller became a flat surface.

It is preferable that the depth of a recessed part in the said uneven part is 1.0-2.0 mm, and the width is 0.5 mm or less.

After completing the second rolling step, the method may further include mounting a shadow mask on the convex portion of the mask support by welding.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention for achieving the above object will be described in more detail.

Figure 1 is a cross-sectional configuration diagram showing a general planar color cathode ray tube to which the present invention is applied, Figure 3a, 3b to 4a, 4b is a process chart showing an example of the Q value setting method of the mask support applied in the present invention Is shown.

For convenience of explanation, the same parts and members as in the prior art will be described with the same reference numerals.

In other words, since the configuration and basic operation of the flat color cathode ray tube to which the present invention is applied are the same as the configuration and operation of the general planar cathode ray tube described above in the related art, a redundant description thereof is omitted, and only the present invention is applied. Only the characteristic part of the "Q" value setting method of a mask support body is limited and demonstrated.

In the flat color cathode ray tube to which the present invention is applied, a phosphor 11 is formed on an inner side thereof, and a panel 10 having a safety glass 12 attached thereto is provided on an outer side thereof.

A rear panel of the panel 10 is integrally fused with a funnel 20 having a neck portion 21 on which an electron gun 23 is mounted, and the inner and outer edges of the panel 10 are long and short as shown in FIG. 3. A rail-shaped mask supporter 30 (hereinafter referred to as a “rail”) is attached to the mask supporter 30, and a shadow mask 40 serving as color sorting of the electron beam scanned by the electron gun 23 is used for welding. These structures are identical to the internal structure of the general flat color cathode ray tube described above in the prior art.

As shown in FIG. 5, the process of mounting the rail 30 to the inner surface of the panel 10 includes a first rolling step of forming an uneven portion on the shadow mask attaching surface of the rail 30, and forming a rail having the uneven portion formed therein. Attached to the attachment step and the second rolling step to make the height of the attached rail constant, it will be described in detail below.

First rolling step

As shown in FIG. 6, when the first roller 71 is rotated with respect to the upper side of the rail 30 before being attached to the inner side of the panel 10, the upper side of the rail 30 shown in FIG. Threaded irregularities are formed. At this time, the rail 30 is preferably made of a metal material of about SUS446 due to the material strength characteristics so that the uneven portion can be formed even by a small pressure input.

In addition, it is preferable that the 1st roller 71 uses the rolling roller in which the thread | thread was formed in the circumferential surface direction.

As shown in Fig. 6, the width of the sawtooth type and its spacing is important to be set in consideration of the shadow mask attaching process, which is a subsequent process. In general, the point where the laser welding pitch is 0.7 to 1.0 mm and the width of the bone at the time of indentation should be set to 0.5 mm or less. As shown in Figure 6, the mountain portion is reduced in height at the same time indentation and the upper width of the valley is reduced. In this case, when the initial width of the bone is set to 0.5 mm or more, sufficient bonding force of the shadow mask cannot be secured during laser welding, and shadow mask support is impossible.

In addition, the height (H) of the screw thread formed in the first rolling step is preferably set within the range of 1.0-2.0 mm.

The reason for limiting the numerical values for the height H of the thread and the width W of the valley as described above is that when the height H of the thread is 1.0 mm or less, it is required in the second rolling step to be described later with a small force. Although it is possible to press-fit a thread, the tip of the screw may be damaged during press-fitting, so that sufficient strength cannot be obtained. When the height (H) of the thread is 2.0 mm or more, excessive force is required to obtain a "Q" dimension. This is because it is difficult to obtain the correct "Q" dimension because the panel 10 will be broken or cause deformation.

Attachment Step

Next, the rail 30 having the uneven portion formed in the first rolling step is fused to the inner surface of the panel 10 on which the phosphor 11 is formed by frit glass.

At this time, the fusion method is put into the firing furnace in a state where the frit glass is filled in the space formed inside the mask supporter 30 in the same manner as in the conventional method, and then attached by firing.

Second rolling step

As described above, after forming the uneven portion on the upper side of the mask supporter 30 by the first rolling step, the second roller 72 is rolled with respect to the upper side of the rail 30 on which the thread-shaped uneven portion is formed. Adjust the value.

That is, when the second roller 72 is rolled with respect to the upper surface of the rail 30 on which the thread-shaped uneven portion is formed as described above, the tip of the thread becomes flat as shown in FIG. 7, and the upper end and the upper end of the thread The width is reduced, and the "Q" value is adjusted by the above process.

When the gap between the inner surface of the panel on which the phosphor is formed and the upper surface of the rail, that is, the "Q" value, is adjusted by the above-described series of operations, the shadow mask is mounted on the upper surface of the rail as shown in FIG. do.

Therefore, the "Q" value can be adjusted without requiring a separate grinding wheel or the like for precisely machining the upper surface of the rail.

Until now, the process of adjusting the "Q" value by forming an uneven portion (threaded thread) on the upper side and mounting it on the inner surface of the panel before mounting the rail applied in the present invention to the inner side of the panel has been described. According to the present invention, a screw thread is formed on the upper side of the rail in the state of being mounted on the inner surface of the panel, and the "Q" value is adjusted by the above operation while the rail is mounted on the inner side of the panel. Can be effectively achieved.

As described in detail above, according to the present invention, the rail to which the shadow mask is attached has a feature of simplifying the manufacturing process by eliminating the grinding process performed to maintain a uniform height with the inner surface of the panel.

In addition, the present invention is characterized by facilitating a screen printing step of attaching a rail after forming a phosphor by eliminating the grinding step performed to make the height of the mask support uniform.

So far, the preferred embodiments of the present invention have been described and illustrated in detail, but are not limited thereto and can be variously changed and used by those skilled in the art.

However, it is apparent that such simple modifications fall within the scope of the present invention described in the claims.

Claims (5)

In a flat color cathode ray tube comprising a panel having a fluorescent surface formed on the inner surface, a mask support attached to the inner surface of the panel, and a shadow mask attached to the mask support while maintaining a predetermined distance (Q) from the fluorescent surface. And at least a portion of the shadow mask attaching surface of the mask support comprises a plurality of irregularities. In the method of manufacturing a planar color cathode ray tube comprising a panel having a fluorescent surface formed on the inner surface, a mask support attached to the inner surface of the panel, and a shadow mask attached to the mask support while maintaining a predetermined distance (Q) with the fluorescent surface In A first rolling step of forming a plurality of uneven parts by rotating a first roller with respect to a shadow mask attaching surface of the attached mask supporter; Attaching a mask supporter to an inner surface of the panel on which the fluorescent surface is formed; And And a second rolling step of rotating the second roller on the formed concave-convex portion to make the interval between the inner surface fluorescent surface of the panel and the shadow mask attaching surface of the mask support constant. The method of claim 2, The first roller has a serrated screw thread provided on its outer circumferential surface, and the outer circumferential surface of the second roller is provided with a flat surface. The method according to claim 1 or 2, A method of manufacturing a flat color cathode ray tube, wherein the depth of the recess in the recess is 1.0-2.0 mm and the width is 0.5 mm or less. The method of claim 2, And mounting a shadow mask on the convex portion of the mask support by welding after completing the second rolling step.