JP2001135225A - Manufacturing method of color-discriminating electrodes, and color cathode-ray tube using them - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide color-discriminating electrodes that eliminate positional shift of apertures by suppressing wrinkles from developing on the mask plate and a color cathode-ray tube that can realize superior color purity by means of this. SOLUTION: In a method to manufacture color-discriminating electrode that a rectangular mask plate 7 composed of a perforated region 13 with many apertures 12 and perforated regions 14a and 14b formed at periphery of the perforated region 13 is pinched by a pair of jigs 19 and 20 at the non-perforated regions 14a and 14b formed along longer sides facing each other, portion along inner face of sandwiching parts 22 is welded to a frame to stretch in the state that the both sandwiching parts 22 are pulled toward the direction D to apply tension, followed by removing the part outside this welded portion, a plurality of non-pinching parts 21 that do not pinch the mask plate 7 are disposed on the jigs 19 and 20 in symmetry about the center of the pinching parts 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a color selection electrode in which a tension mask (mask plate) used for a television receiver or a computer display is stretched on a frame by stretching in a long axis direction or a short axis direction. And a color cathode ray tube using the same.

[0002]

2. Description of the Related Art Generally, a color cathode ray tube has a large number of apertures, and has a color selection electrode for selecting a color by passing an electron beam emitted from an electron gun through the apertures. The color selection electrode includes a mask plate and a frame for fixing the mask plate.

[0005] The types of color selection electrodes will be described with reference to FIG. (A) is a press mask obtained by pressing a flat mask plate a into a predetermined curved shape and welding it to a frame b. (B) is a two-dimensional tension mask in which a flat mask plate a is stretched and welded to a frame b in a state where tension is applied in two-dimensional directions of a long axis and a short axis. (C)
This is a one-dimensional tension mask in which a flat mask plate a is stretched and welded to a frame b in a state in which tension is applied in one of the major axis and the minor axis in one-dimensional direction.

[0004] In recent color cathode ray tubes, the panel shape has been flattened in that the reflection of external light is small and the appearance is good, but with the flattening, the distance between the phosphor screen and the color selection electrode has been increased. The masking plate for the color selection electrodes also needs to be planarized to be appropriate.

However, in the case of a press mask, the thermal expansion of the color selection electrode due to the absorption of the electron beam increases with the planarization, and as a result, the aperture of the mask plate is displaced and the electrons passing through the aperture are displaced. The doming phenomenon in which the beam does not properly hit the phosphor and color unevenness occurs increases. Further, when a flat surface is formed by press working, permanent deformation of the mask plate due to an impact such as dropping is likely to occur, so that it is very difficult to realize a flat mask plate.

On the other hand, a two-dimensional tension mask applies tension in two-dimensional directions of a long axis and a short axis of a mask plate.
It is difficult to maintain an appropriate tension balance in each direction such that wrinkles do not occur on the mask plate.

[0007] Compared to these, the one-dimensional tension mask has an advantageous structure with respect to the above-mentioned problems, and is therefore being adopted as a mask plate for a color selection electrode of a color cathode ray tube having a flat panel. . This color selection electrode is formed by forming a rectangular mask plate having a perforated region having a large number of openings and a non-perforated region formed around the perforated region on opposite long sides (short sides). A portion along the inside of the holding portion is welded to a frame by holding the non-porous region formed along the holding portion with a pair of jigs, applying tension by pulling both holding portions in the stretching direction, and applying a tension. After being stretched, it is manufactured by removing the outer portion of the welded portion.

[0008]

Generally, a one-dimensional tension mask has a non-porous portion (referred to as a bridge portion) between holes in a perforated region of a mask plate. When the mask plate is stretched over the frame by applying tension in the stretching direction (mainly the short axis direction), a small force is applied to the mask plate in the axial direction (long axis direction) perpendicular to the stretching direction. Is working. Therefore, if the force in the long axis direction is too small, there is a problem that wrinkles are generated on the mask plate due to the compressive stress. In particular, due to the heat treatment during the manufacturing process of the color cathode ray tube, local wrinkles generated near the welded portion with the frame in the perforated region of the mask plate become remarkable, and there was a problem that the position of the aperture was shifted.

Therefore, the present invention solves the above-mentioned conventional problems and suppresses the occurrence of wrinkles in the mask plate to eliminate the displacement of the aperture, and realizes excellent color purity using the same. It is an object of the present invention to provide a color cathode ray tube that can be used.

[0010]

In order to achieve the above object, a first invention of the present application has a rectangular shape comprising a perforated region having a large number of openings and a non-perforated region formed around the perforated region. In a state in which a non-porous region formed along a long side or a short side opposed to each other is clamped by a pair of jigs, and both clamping portions are pulled in a stretching direction to apply tension, In a method for manufacturing a color selection electrode in which a portion along the inside of the holding portion is welded to the frame and stretched, and then the outside portion of the welding portion is removed, the jig includes a plurality of non-holding portions that do not hold the mask plate. The portion is provided so as to be arranged symmetrically with respect to the center of the holding portion.

According to the first aspect of the present invention, when a mask plate pulled by sandwiching and pulling a non-porous region formed along a long side or a short side opposed to each other with a pair of jigs is welded onto a frame. Since the non-clamping portion of the mask plate on which the jig is not clamped is provided so as to be arranged symmetrically with respect to the center of the clamping portion, if the entire clamping portion is pulled in the short-axis direction, the long axis of the non-clamping portion becomes longer. Outside direction (perforated area or almost diagonal position of mask plate)
Are pulled in the same direction, and local tension can be generated in the diagonal axis direction with respect to the mask plate. Due to the local tension, the force in the long axis direction caused by the bridge portion in the effective area can be increased, so that the compressive stress of the mask plate can be suppressed. Therefore, it is possible to suppress the occurrence of local wrinkles generated in the welded portion between the mask plate and the frame due to the heat treatment in the manufacturing process of the color cathode ray tube.

In the above arrangement, the jig for holding the non-perforated region of the mask plate is constituted by a pair of upper and lower jigs, and a recess is formed in the upper jig and / or the lower jig. Providing,
Alternatively, the jig for holding the non-porous area of the mask plate is composed of a pair of upper and lower jigs, and the upper jig or the lower jig is divided in an axial direction orthogonal to the stretching direction. By,
By forming the non-clamped portion on the jig, the non-clamped portion can be specifically formed on the jig.

[0013] In the above structure, the non-clamping portion may be extended in the axial direction from an extension of a boundary between the non-porous region and the perforated region located on both sides in the axial direction orthogonal to the direction in which the mask plate is stretched. It is preferable that the tension is formed along the diagonal axis direction of the mask plate.

When the length of the non-clamping portion is a, 10
By satisfying the relationship of mm ≦ a ≦ 100 mm,
The local tension acting on the diagonal axis of the mask plate can be within a desired range.

In the above structure, the width of the non-porous regions located on both sides in the axial direction perpendicular to the direction in which the mask plate is stretched is
By being formed so as to gradually widen from the center to both ends in the stretching direction, the stress applied in the stretching direction of the non-porous region is dispersed, and both sides of the non-porous region are dispersed. Stress distribution can be smoothed.

In the above structure, the distance from the center of the non-porous region to the non-porous region located on both sides in the axial direction perpendicular to the direction in which the mask plate is stretched from the center of the non-porous region. A slit is formed by cutting out a curve or a straight line that increases toward both ends in the stretching direction, or in a non-porous region located on both sides in the axial direction orthogonal to the stretching direction of the mask plate. A plurality of slits are formed from both sides of the non-perforated region in a direction in which the distance from the boundary line between the perforated region and the perforated region is increased from the center to the both ends in the stretching direction. According to the formation of the cut portions cut at intervals, in addition to the above-described action of dispersing the stress applied to the non-porous area, the mask plate has a shape without dents on both sides of the mask plate. Exposure without light leakage from both sides Effect that good does not occur can be achieved.

In addition, the color selection electrode having the above-described configuration is arranged in a tube composed of a panel having a phosphor screen formed on an inner surface thereof and a funnel so as to be in close proximity to the phosphor screen. By locking the frame on which the mask plate is welded to the panel pin of the panel via an elastic support, using a color selection electrode that can eliminate the displacement of the opening shown above, A color cathode ray tube capable of realizing excellent color purity can be configured.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.
This will be described with reference to FIG.

FIG. 1 is a longitudinal sectional view of a color cathode ray tube according to a first embodiment of the present invention, FIG. 2 is a perspective view showing a color selection electrode of the color cathode ray tube, and FIG. (A) is a perspective view, (b) is a cross-sectional view taken along the line EE ′, and FIG. 4 is a cross-sectional view of a modified example.

As shown in FIG. 1, the color cathode ray tube of the first embodiment comprises a panel 2 having a phosphor screen 1 formed on the inner surface thereof and a funnel 3 connected to the rear of the panel 2 to form a tube 23. Then, on the neck 3a of the funnel 3,
An electron gun 5 for emitting an electron beam 4 is built in, and a deflection yoke 6 for deflecting the electron beam 4 is mounted on the outer peripheral surface of the funnel 3. Panel 2 has 3 on its inner surface.
Phosphor dots of colors are applied, thereby forming a phosphor screen 1, and a flat mask plate 7 is arranged substantially parallel to the phosphor screen 1.

The mask plate 7 is formed by subjecting a flat plate to an etching process, has a large number of regularly arranged openings 12, and receives three electron beams 4 emitted from the electron gun 5. It plays a role of color selection, and is held by a frame 8 to form a color selection electrode 9.
The color selection electrode 9 is locked to the tube by fitting an elastic support 10 attached to the frame 8 and a panel pin 11 provided on the panel 2.

As shown in FIGS. 1 and 2, the frame 8 has a pair of long side members 8a having a thickness of 1.4 mm and made of 36% Ni--Fe and having a substantially triangular cross section. It is 36% at the same board thickness of 1.4mm which is laid on both ends.
This is a rectangular frame made of a pair of short side members 8b made of Ni-Fe and having a U-shaped cross section. The front surface of the long side member 8a (in FIG. 2, the top surface on which the mask plate 7 is welded) is a curved surface protruding toward the phosphor screen 1 with a predetermined radius of curvature. Therefore, the mask plate 7 is fixed to the frame 8 in a state of being curved along the long axis direction.

The mask plate 7 is made of Fe,
A perforated region 13 made of 2% Ni-Fe, 36% Ni-Fe, or the like, and having a large number of rectangular openings 12 at a predetermined pitch and distribution, and a non-porous region 14a formed therearound. And 14b (FIG. 3).

As shown in FIG. 2, the non-perforated regions 14a, 14a located on both sides in the long axis direction of the perforated region 13 are formed such that the width B at both ends in the short axis direction is wider than the width A at the central portion. Have been. That is, the width A at the center is set to 5 mm, and the width A is connected to both ends by a smooth curve of R = about 3700 mm. The mask plate 7 has a non-porous area 1 having a high strength.
By making the shape of 4a this, stress acts in the diagonal axis direction (the direction of arrow C in FIG. 2) at the time of stretching, thereby avoiding concentration of stress in the stretching direction of non-porous region 14a. The stress distribution can be smoothed by making the both sides in the major axis direction of the non-porous region 14a into the curved lines.

Next, a method of manufacturing the color selection electrode 9 of the color cathode ray tube according to the first embodiment will be described. In the first embodiment, as one example, a color selection electrode 9 used for a color cathode ray tube for a 33-inch television was manufactured.

First, the side surface of the long side member 8a of the frame 8 is compressed inward by applying a distributed load within the elastic range at three to nine pressing points. Then, in this state, the non-porous regions 14b, 1b formed along the opposing long sides of the mask plate 7
4b is clamped by jigs 19 and 20 to be described later,
Is applied in the short axis direction (direction of arrow D) by applying a tension of about 300 kgf in total, and is welded to the top surface curved inward in the long axis direction of the long side member 8a. Thereafter, when the load applied to the long side member 8a is removed and the tension of the mask plate 7 is released, a required distribution of tension is applied to the mask plate 7, and the outer portion of the welded portion is removed to produce the color selection electrode 9. Is done.

In the first embodiment, as shown in FIG. 3, the non-porous areas 14b, 1b located on both sides of the mask
A pair of upper and lower jigs 19 and 20 for holding the upper and lower jigs 4b
Is used. These jigs 19 and 20 include a non-clamping portion 21.
Are formed symmetrically with respect to the center of the holding portion 22 and have a predetermined length a. To form the non-clamping portion 21, as shown in FIG.
9a and the upper jig 19 as shown in FIG.
May be provided in the longitudinal direction (direction orthogonal to the stretching direction). The concave portion 19a and the dividing portion 19b as the non-clamping portion 21 are respectively provided with a predetermined length a along the long axis direction from an extension of a boundary 15a between the non-porous region 14a and the perforated region 13.

In such a state, the non-porous area 1 of the mask plate 7
4b and 14b are sandwiched between the upper jig 19 and the lower jig 20, and the holding portion 22 is pulled in the stretching direction D, the non-holding portion 2
By generating the local tension in the diagonal axis direction of the mask plate 7 by pulling the both-end holding portions 22a located on the outer side in the major axis direction (diagonal position of the mask plate 7) in the same direction. Can be. As a result, the force in the long axis direction can be increased, so that factors causing local wrinkles in the vicinity of the welded portion between the mask plate 7 and the frame 8 generated when the mask plate 7 is stretched or when heat treatment is performed. Compressive stress in the major axis direction can be suppressed. Therefore, it is possible to obtain a color selection electrode in which the displacement of the aperture is eliminated by preventing wrinkling of the mask plate, and a color cathode ray tube using the same can realize excellent color purity.

A computer simulation was performed as an evaluation, and a unit area in the long axis direction near the welded portion in the perforated region 13 when the non-clamping portion 21 (the concave portion 19a and the dividing portion 19b) is not provided in the upper jig 19 is provided. The hit force is 0.
073 kgf / mm ² . On the other hand, when the non-clamping portion 21 having the length a is provided on the upper jig 19, the force applied in the long axis direction increases. When a = 100 mm, the force per unit area is 0.1 mm. It is 14 kgf / mm ² , which can generate approximately twice the force. However, when the length is set to 100 mm or more in practice, a discontinuous distribution having a local peak in the tension distribution acting in the short axis direction is likely to occur. When the electrode 9 is targeted, practically, 10 mm ≦ a ≦
Desirably, it is 100 mm.

Next, a second embodiment of the present invention will be described.

FIG. 5 shows a color selection electrode 9 used in the second embodiment.
FIG. 4 is a plan view showing a mask plate 7 for forming a mask. Second
In the embodiment, the non-porous regions 14a on both sides of the mask plate 7
Then, a slit 16 was formed by cutting out an arcuate line in which the distance from the boundary 15a to the perforated region 13 increased from the center to both ends in the short axis direction. Other configurations are the same as those of the first embodiment. However, in the second embodiment, the stress is prevented from being concentrated in the direction in which the non-porous region 14a is stretched as in the first embodiment, and the stress distribution is reduced. Instead of denting both sides of the mask plate 7 for smoothness, the central part A and the both ends B have the same width. Each of the points 13 to 12 mm is connected by a smooth curve, and an arcuate slit 16 having a width of 0.5 mm is formed.
Is provided.

As a result of performing a computer simulation as an evaluation, tension in the diagonal axis direction can be applied to the mask plate 7, and a long axis direction generated when the mask plate 7 is stretched in the first embodiment. A force equivalent to the force applied to the was obtained. Thereby, similarly to the first embodiment, generation of the wrinkles in the heat treatment step can be suppressed. In addition, in the second embodiment, the rectangular shape of the mask plate 7 is not changed and the slits 16 are provided without leaving any recesses on both sides in the major axis direction of the mask plate 7. Therefore, in the manufacturing process of the color cathode ray tube, At the time of exposure in the phosphor screen process, light hardly leaks from both sides of the phosphor screen, so that exposure defects can be reduced and the yield can be improved.

Therefore, in the second embodiment, it is possible to suppress the occurrence of wrinkles in the perforated region 13 of the mask plate 7 without causing exposure failure during the screen process, and to exhibit the same effect as in the first embodiment. Can be.

In the second embodiment, the slit 16 of the non-perforated area 14a has an arcuate shape. However, the present invention is not limited to this. The line connecting the center of the non-perforated area 14a and both ends thereof is provided. May be a straight line, that is, a dogleg shape.

Next, a third embodiment of the present invention will be described.

FIG. 6 is a plan view showing a mask plate 7 according to the third embodiment. In the third embodiment, a non-perforated region 14 a on both sides of the mask plate 7
A notch 17 having a predetermined width was formed in which the distance from 5a increased from the center to both ends in the short axis direction. In the state where the widths of the center portion and both end portions (A and B shown in FIG. 2) are the same size, the notch portion 17 has a smooth point at 5 mm at the center portion and 12 mm at both end portions from the boundary 15a. It is formed by connecting a curve 18 and cutting a number of slits at predetermined intervals from both sides of the non-porous regions 14a, 14a toward the curve. By doing so, similarly to the second embodiment, by applying tension in the diagonal axis direction to the mask plate 7, the force acting in the long axis direction of the perforated region 13 can be increased. The same effect as in the embodiment can be exhibited. The curve 18 is formed into a U-shaped straight line connecting the center of the non-porous regions 14a, 14a and both ends thereof, and the slits 17 are formed by cutting the numerous slits up to the straight line. Is also good.

In the above embodiment, the mask plate 7 is described in which tension is applied in the short axis direction. Conversely, the mask plate 7 is pulled in the long axis direction and the short side member 8 of the frame 8 is pulled.
The present invention can also be applied to the case of welding to b. In this case, the apertures 12 are arranged so that the major axis is directed in the major axis direction. In the above-described embodiment, the non-clamping portion 21 having the concave portion 19a and the dividing portion 19b is provided on the upper die jig 19. However, the concave die 19a includes both or the lower die jig 20, and the dividing portion 19b has the lower die jig. The tool 20 can also be provided.

[0038]

As described above, according to the present invention,
When the mask plate of the color selection electrode is stretched over the frame, a non-clamping portion is provided on a jig for clamping the mask plate, and tension is applied locally in the diagonal axis direction of the mask plate, thereby stretching the mask plate. To manufacture a color selection electrode in which a local wrinkle generated mainly at a welded portion between a mask plate and a frame is prevented by increasing a force applied in an axial direction perpendicular to the direction to eliminate a positional shift of an opening. By using the color selection electrode, a color cathode ray tube which can realize excellent color purity can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a schematic configuration of a first embodiment of the present invention.

FIG. 2 is an exemplary perspective view showing a color selection electrode according to the embodiment;

3A and 3B show a process of stretching a color selection electrode according to the embodiment, wherein FIG. 3A is a perspective view and FIG. 3B is a cross-sectional view taken along line EE ′.

FIG. 4 is an exemplary sectional view showing a modification of the embodiment in a stretching step;

FIG. 5 is a plan view showing a mask plate according to a second embodiment of the present invention.

FIG. 6 is a plan view showing a mask plate according to a third embodiment of the present invention.

FIG. 7 is a perspective view showing types of conventional color selection electrodes.

[Description of Signs] 1 screen 2 panel 3 funnel 7 mask plate 8 frame 9 color selection electrode 10 elastic support 11 panel pin 12 aperture 13 perforated area 14a non-porous area located on both sides in the long axis direction 14b short axis direction 15a Boundary line between non-porous area and perforated area in long axis direction 15b Boundary line between non-porous area and perforated area in short axis direction 16 Slit 17 Notch 18 Curve 19 Mold jig 19a Recess 19b Separation part 20 Lower jig 21 Non-clamping part 22 Clamping part 22a Both ends clamping part 23 Tube A Width of central part of non-porous area B Width of both ends of non-porous area D Mask plate frame Stretching direction a Length of non-clamping part

Continuation of the front page (72) Inventor Takao Matsunami 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 5C027 HH23 5C031 EE03 EE11 EF05 EH04

Claims (9)

[Claims] 1. A rectangular mask plate comprising a perforated region having a large number of openings and a non-perforated region formed around the perforated region is formed along opposing long sides or short sides. The non-perforated region to be formed is clamped by a pair of jigs, and a portion along the inside of the clamping portion is welded to the frame in a state where tension is applied by pulling both clamping portions in the stretching direction and stretched. Thereafter, in the method of manufacturing a color selection electrode for removing the outer portion of the welded portion, the jig is configured such that a plurality of non-clamped portions that do not clamp the mask plate are arranged symmetrically with respect to the center of the clamped portion. A method for manufacturing a color selection electrode, comprising: 2. A jig for holding a non-porous region of a mask plate comprising a pair of upper and lower upper and lower jigs.
2. The method for producing a color selection electrode according to claim 1, wherein a non-clamped portion is formed in the jig by providing a concave portion in the lower mold jig. 3. A jig for sandwiching a non-porous area of a mask plate is constituted by a pair of upper and lower jigs, and the upper jig or the lower jig is orthogonal to the stretching direction. The method for producing a color selection electrode according to claim 1, wherein the non-clamping portion is formed in the jig by dividing the jig in the axial direction. 4. The non-clamping portion is formed along the axial direction from an extension of a boundary between a non-perforated region and a perforated region located on both sides in an axial direction perpendicular to the direction in which the mask plate is stretched. The method for producing a color selection electrode according to claim 1. 5. The method according to claim 4, wherein a relationship of 10 mm ≦ a ≦ 100 mm is satisfied, where a is the length of the non-clamped portion. 6. The mask plate is formed so that the width of the non-porous regions located on both sides in the axial direction perpendicular to the extending direction of the mask plate gradually increases from the central portion to both ends in the extending direction. Item 6. The method for producing a color selection electrode according to any one of Items 1 to 5. 7. A non-porous region located on both sides in the axial direction orthogonal to the direction in which the mask plate is stretched, the distance from the boundary between the non-porous region and the perforated region in the direction of the stretching from the center. The method for producing a color selection electrode according to any one of claims 1 to 5, wherein a slit is formed by cutting out a curve or a straight line that increases toward both ends. 8. A non-porous region located on both sides in the axial direction orthogonal to the direction in which the mask plate is stretched, and the distance from the boundary between the non-porous region and the perforated region is stretched from the center thereof. 6. A cut portion formed by cutting a plurality of slits at predetermined intervals from both sides of the non-porous region toward a curve or a straight line that increases toward both ends in the direction. Method for producing a color selection electrode. 9. The color selection electrode according to claim 1, wherein the color selection electrode is disposed close to and opposed to the phosphor screen in a tube composed of a panel having a phosphor screen formed on an inner surface thereof and a funnel. A color cathode ray tube in which a frame on which a mask plate of a color selection electrode is welded is fixed to a panel pin of the panel via an elastic support.