KR20010029010A - Mask for flat CRT - Google Patents

Abstract

PURPOSE: A mask for flat cathode ray tube is provided to perform smoothly a cutting process without cutting a mask from a cutting start point when cutting an unnecessary portion of a mask. CONSTITUTION: A cathode ray tube comprises a panel having a fluorescent layer formed on its inner face and a mask(7) welded on a rail to be matched with a location of the fluorescent layer. The mask comprises a plurality of cutting guide portion(14). The cutting guide portions(14) determine a cutting start position and guides the cutting direction. The cutting guide(14) portion has a hole shape. The cutting guide portion(14) is formed at an edge portion of a cutting line(13) in order to guide easily the cutting direction.

Description

Mask for flat cathode ray tube {Mask for flat CRT}

The present invention relates to a planar cathode ray tube, and more particularly to a mask for a planar cathode ray tube for ease and cost reduction in the cutting process after the mask welding.

Background Art [0002] In general, flat cathode ray tubes are used for television receivers, video displays, and the like, and the panel which is the display surface of an image has a flat panel shape, which is attracting attention in recent years because it is advantageous for the enlargement and high definition of the current trend.

Like the general cathode ray tube, the planar cathode ray tube adopts a method in which three electron beams emitted from an electron gun emit phosphors formed on the inner surface of the panel to realize color images.

1 shows a general planar cathode ray tube.

As shown in the figure, a flat panel 2 having a red, green, and blue fluorescent film 1 coated on its inner surface and a frit glass at the rear end of the panel 2 are fused to form a vacuum inside the cathode ray tube. A funnel 3 in the form of a retaining bulb, an electron gun 6 enclosed in the neck 4 of the funnel 3 to emit an electron beam 5, and a grill or slot to pass through the electron beam 5 A mask 7 having a myriad of apertures 7a in shape, a rail 8 supporting the mask 7 at a predetermined distance from the inner surface of the panel 2, and the electron beam 5 are deflected in the horizontal and vertical directions. It consists of a deflection yoke (9) provided on the outer peripheral surface of the neck (4) of the funnel (3).

In this state, when power is applied, the electron beam 5 is emitted from the electron gun 6, and the electron beam 5 is deflected in the horizontal and vertical directions by the deflection yoke 9, and the mask 7, which is a color-coded electrode, is The image is displayed by striking the fluorescent film 1 in the state where color selection is performed while passing.

The display of the color image is caused by the red, green, and blue phosphor pixels constituting the fluorescent film 1, and the aperture 7a of the mask 7 matches the position of the phosphor to be hit to achieve a clear image. Should be.

Therefore, in the case of a general cathode ray tube, a mask assembly and a panel corresponding to 1: 1 can be used to make an electron beam emit light of a certain fluorescent substance by attaching a mask having a pattern preformed to the frame and exposing it when forming a fluorescent film. I choose to be.

However, the planar cathode ray tube takes a different method from that of a typical cathode ray tube, and the fluorescent film 1 is formed using the master mask 10 having the screen pattern 10 a as a reference as shown in FIGS. 2 and 3. After the process, the rail 8 and the mask 7 of the panel 2 are combined in an interchangeable mask (ICM) process.

Here, the ICM process stretches the effective aperture 7a area of the mask 7 to a certain size, and accurately positions the stretched apertures 7a and the fluorescent film 1 so as to correspond to each other. 7) is a step of coupling the rail (8) surface.

At this time, the mask 7 has eight reference holes 7b on its outer circumference as shown in FIG. 4. In the ICM process, the mask 7 is tensioned while observing the eight reference holes 7b at a predetermined coordinate through a vision camera. Done.

In addition, there are four reference holes 10b on the master mask 10 at regular intervals along the outer periphery of the effective surface as shown in FIG. 2, and the exposure is performed by using the master mask 10 when forming the fluorescent film 1. Therefore, not only the screen pattern 10a but also the reference hole 10b is formed together.

FIG. 5 schematically shows the fluorescent film 1 formed through the above process, and it can be seen that four reference holes 1b are formed on the outer surface of the fluorescent surface 1a of the fluorescent film 1, which is fluorescent It means that the overall position of the membrane 1 can be confirmed through the position of this reference hole 1b.

In this state, while the reference holes 1b of the fluorescent film 1 and the reference holes 7b of the mask 7 are checked, the centers and axes thereof are coincident with each other, and the rails 7 are bonded to the panel 2 by the rails. The mask 7 and the fluorescent film 1 can be fixed at positions corresponding to each other at regular intervals by welding them on the (8) surface to integrate them.

On the other hand, after welding the mask 7 on the surface of the rail 8, unnecessary parts remain on the outside based on this welding line 11, and if left unattended, damage other parts or mis-discharge with other parts. Since it may cause such as, etc., the unnecessary portion is cut out using the blade 12 with a margin of about 20 mm outward from the welding line 11 as shown in FIG.

However, in order to cut out the unnecessary portion of the mask using the blade as described above, the blade must penetrate through the mask, which is a hard metal thin film, at the arbitrary cutting start position. Not only is this not performed smoothly, but the mask may tear in undesired directions.

Therefore, in order to smoothly perform the mask cutting operation, the blades need to be replaced and used from time to time, which increases the cost of the blades and delays the work time due to the interruption of work, and increases the manufacturing cost since the blades must be equipped with expensive wear-resistant blades. There is a problem.

The present invention has been proposed in view of the above, and in cutting an unnecessary part of the mask, a mask for a planar cathode ray tube capable of guiding the cutting direction constantly while allowing the cutting without cutting the mask directly from the cutting start point is provided. The purpose is to provide.

1 is a block diagram of a general planar cathode ray tube,

2 is a master mask configuration diagram used for forming a fluorescent film,

3 is an exposure process diagram,

4 is a schematic view of a conventional mask,

5 is a schematic view of a fluorescent film,

6 is a cutting process diagram of a mask;

7 is a schematic diagram of a mask for a planar cathode ray tube according to the present invention.

*** Explanation of symbols for main parts of drawing ***

7: mask 7b: reference hole of the mask

11: weld seam 12: blade

13: cutting line 14: hole for cutting guide

According to an aspect of the present invention, a mask for a planar cathode ray tube includes a panel having a fluorescent film pattern formed on an inner surface thereof, and a mask welded to a rail surface so as to match a position of the fluorescent film, wherein the mask has an outer edge from the weld line. In the planar cathode ray tube cut along a portion spaced by a predetermined distance in the direction: The mask has a plurality of cutting guides along the cutting line to guide the cutting direction while determining the cutting start position of the cutting jig. .

Preferably, the cutting guide has a hole shape, characterized in that formed on the corner of the cutting line so as to easily guide the cutting direction of the cutting jig.

In this way, a cutting guide hole is formed at four corners of the cutting line of the mask, so that the cutting jig, that is, the cutting start position of the blade can be easily selected, and the blade does not have to penetrate the mask at the cutting start position. This not only significantly reduces the wear on the blade, but also prevents the mask from tearing in unwanted directions.

As a result, it is possible to provide a reliable mask, it is possible to significantly reduce the number of replacement of the blade has the advantage of reducing the manufacturing cost.

And, there may be a plurality of embodiments of the present invention, hereinafter will be described in detail with respect to the most preferred embodiment.

This preferred embodiment allows for a better understanding of the objects, features and advantages of the present invention.

Hereinafter, exemplary embodiments of a mask for a planar cathode ray tube according to the present invention will be described in detail with reference to the accompanying drawings.

In addition, in drawing used for description, about the component same as FIG. 1 thru | or 6, the same code | symbol may be attached | subjected, and the overlapping description may be abbreviate | omitted.

7 is a schematic diagram of a mask for a planar cathode ray tube according to the present invention, in which eight reference holes 7b are located at the outer circumferential portion of the mask 7 and outward from the welding line 11 between the mask 7 and the rail 8. It can be seen that the cutting guide hole 14 is located at four corners of the virtual cutting line 13 spaced about 20 mm apart.

Here, the eight reference holes 7b are holes for determining the tensile position when the mask 7 is tensioned as described above, and the four cutting guide holes 14 have the mask 7 on the rail 8 surface. After welding to the cut-out portion of the outer edge of the welding line 11 using the blade 12, it is a hole for determining the cutting start position of the blade 12 and guiding the cutting direction.

Therefore, the four cutting guide holes 14 are preferably positioned at four corners of the cutting line 13, that is, the position where the cutting direction of the blade 12 can be most easily guided.

In addition, when the four cutting guide holes 14 are formed to be infinitely large, the cutting start position selectivity of the blade 12 and the cutting property of the blade 12 are advantageous, but the strength thereof may be weakened when the mask 7 is tensioned. Therefore, it is preferable to form cutting start position selectivity and cutting property as small as possible in an appropriate range.

In this state, the center of the mask 7 is properly tensioned through the ICM process, and the reference hole 1b of the previously formed fluorescent film 1 and the reference hole 7b of the mask 7 are checked. And the mask 7 is welded onto the surface of the rail 8 fused to the panel 2 after the axes are aligned, the mask 7 and the fluorescent film 1 can be fixed at positions corresponding to each other at regular intervals.

Subsequently, an unnecessary portion located outside the welding line 11 of the mask 7 is cut out using the blade 12. The mask 7 has a hole for cutting guides 14 at a corner of the virtual cutting line 13. Because of this position, the cutting start portion of the blade 12 is selected as one of these holes, and the cutting edge is cut in the other adjacent hole direction. When the blade 12 reaches the hole, the cutting edge is cut again in the other hole direction so that the mask 7 It is possible to cut off all unnecessary portions of.

Accordingly, the blade 12 is inserted into the hole 14 selected as the starting point of cutting without drilling the mask 7 at the start of cutting, and thus cutting the blade 12 without drilling the mask 7. Since the starting point can be easily selected, wear of the blade 12 is significantly reduced, and there is no fear that the mask 7 will be torn out in an undesired direction.

In addition, although specific embodiments of the present invention have been described and illustrated above, it is obvious that the present invention may be variously modified and implemented by those skilled in the art.

Such modified embodiments should not be individually understood from the technical spirit or the prospect of the present invention, and such modified embodiments should fall within the appended claims of the present invention.

It is clear from the above description that, according to the present invention, the cutting start position can be easily selected without cutting the mask without cutting the mask, thereby reducing the wear of the blade and tearing the mask in an undesired direction. Concerns about going out can be resolved.

Therefore, it is possible to provide a reliable mask, it is possible to reduce the number of replacement of the blade as well as to use a low-cost blade (가) has the effect of reducing the manufacturing cost.

Claims (2)

In the planar cathode ray tube which includes a panel formed with a fluorescent film pattern on the inner surface, and a mask welded to the rail surface to match the position of the fluorescent film, the mask is cut along a portion spaced a predetermined distance in the outward direction from the welding line : The mask is, A mask for planar cathode ray tubes, characterized by having a plurality of cutting guides along a cutting line to guide the cutting direction while determining a cutting start position of the cutting jig. The method of claim 1, The cutting guide, Has a hole shape; The mask for planar cathode ray tube, characterized in that formed on the corner of the cutting line so as to easily guide the cutting direction of the cutting jig.