JP3362921B2 - Display device manufacturing method and display device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a color picture tube or the like.
Relates to a manufacturing method and a display device for a display device, are joined particularly flat faceplate and a flat rear plate through the side wall, the support between these face plate and a flat rear plate, which are arranged displayed Device manufacturing method
And a display device .

[0002]

2. Description of the Related Art In recent years, various studies have been made on high-definition broadcasting or a high-resolution picture tube having a large screen accompanying the broadcasting. Generally, in order to achieve high resolution of the picture tube, the spot diameter of the electron beam on the phosphor screen must be reduced.

On the other hand, conventionally, the electrode structure of the electron gun has been improved, or the electron gun itself has been increased in diameter and length, but sufficient results have not yet been obtained. The main reason for this is that as the tube becomes larger, the distance from the electron gun to the phosphor screen becomes longer and the magnification of the electron lens becomes too large. Therefore, in order to achieve high resolution, it is important to reduce the distance (depth) from the electron gun to the phosphor screen.
Further, in this case, wide-angle deflection causes an increase in the difference in magnification between the center and the periphery of the screen. Therefore, wide-angle deflection is not a good idea for high resolution.

Therefore, conventionally, a method of arranging a plurality of independent small picture tubes to obtain a high-resolution large screen is disclosed in JP-A-48-90428, JP-A-49-21019 and JP-A-53. -117130 gazette etc. are disclosed. This kind of method is effective for displaying a huge screen with a large number of divisions arranged outdoors, but the screen size is 40
When displaying a medium-sized large screen of about inch, the connection part of the screen between each area is conspicuous and an unpleasant image is reproduced.
Therefore, when it is used as a home television receiver or a terminal for graphic display in computer-aided design (CAD), the connection part of the screen becomes a fatal defect.

In contrast, US Pat. No. 3,071,7
No. 06, Japanese Utility Model Publication No. 39-25641, Japanese Patent Publication No. 42-4928, and Japanese Patent Publication No. 50-17167 have a structure in which a plurality of independent phosphor screens of picture tubes are integrated. Is disclosed. As shown in FIG. 7, the picture tube having the phosphor screen of this integrated structure is provided with a face plate 1, a rear plate 2 facing the face plate 1 , and a plurality of funnels 3 connected to the rear plate 2 so as to remove the vacuum. The enclosure 5 is configured,
The phosphor screen of the integrated structure is formed on the inner surface of the face plate 1 .
Clean 6 is formed. Its face plate 1
Is made of glass, and the rear plate 2 is made of glass or metal.

However, in such a structure, when the screen surface becomes large, the face plate 1 and the rear plate 2 must be made thick so as to withstand the atmospheric pressure load, and in the tube axis direction. It is also necessary to have a large curvature. As a result, the weight of the envelope 5 becomes heavy. Further, when the curvature of the face plate 1 becomes large, the screen becomes difficult to see. Furthermore, the distance between the phosphor screen 6 and the electron gun 8 enclosed in the neck 7 becomes large, and the electron lens becomes unfavorable in terms of magnification.

In particular, when the rear plate 2 is made of glass, it is impossible to have a structure in which the shape greatly changes in terms of its formability and strength against an atmospheric pressure load, and the shape as a whole has to be changed gently. I can't. Therefore, it is not possible to make the portion to which the deflecting device 9 is attached substantially equal to the deflection area of the electron beam, and to reduce the thickness of the portion to which the deflecting device 9 is attached. The device is difficult to use.

As a cathode ray tube which solves the problems of the cathode ray tube having the phosphor screen of the above-mentioned integrated structure, Japanese Patent Application Laid-Open No. Hei 5 (1999) -53187
No. 36363, a flat face plate having a substantially rectangular shape, a side wall extending in a substantially vertical direction from a peripheral portion of the face plate, and a substantially rectangular shape facing the face plate in parallel through the side wall. Of the flat rear plate and a plurality of funnels joined to the rear plate to form a vacuum envelope, and electron beams emitted from a plurality of electron guns sealed in each neck of the funnel, Divide the integrated structure phosphor screen formed on the inner surface of the face plate into a plurality of areas
An illuminating cathode ray tube is shown. In this cathode ray tube,
In order to support the atmospheric pressure load applied to the flat face plate and the rear plate, plate supporting means made of a plurality of metal rods is arranged between the face plate and the rear plate.

In this plate supporting means, the base end is fixed to the rear plate, and as shown in FIG. 8, the tip 11 that abuts the inner surface of the face plate is formed in a wedge shape.

It is known to dispose plate supporting means composed of a long plate-like body or a needle-like body in order to support a flat plate against an atmospheric pressure load applied to the vacuum envelope.
When the plate supporting means is constituted by the rod-shaped body having the wedge-shaped tip as described above, the atmospheric pressure load can be efficiently supported by a small number. Further, there are advantages that the plate supporting means can be manufactured relatively easily and can be easily arranged at a predetermined position.

By the way, the inventors of the present invention have conducted various studies on the above-mentioned plate supporting means having a wedge-shaped tip, and as a result, have found the following problems.

First, there is a problem that the tip portion is crushed by an atmospheric pressure load. As shown in the embodiment of Japanese Patent Laid-Open No. 5-36363, a load of 60 to 70 kg is applied to each plate supporting means by an atmospheric pressure load, the tip portion is crushed by this load, and the length of the plate supporting means is increased. The face plate and the rear plate bend as the crushed portion becomes shorter. The crush amount of the tip of each plate support means is not necessarily the same, and changes depending on the finished state of the tip. Therefore, the amount of bending of the face plate and the rear plate becomes non-uniform according to the amount of crushing of the tip end portion of the plate supporting means, and there is a case where the portion where an excessive amount of bending is generated breaks.

Second, the processing accuracy of the tip portion becomes a problem.
The wedge shape at the tip of the plate supporting means is formed at an angle that does not block the trajectory of the electron beam that irradiates the phosphor screen, and is processed so that the entire linear tip is in contact with the inner surface of the face plate. When the cathode ray tube is a black stripe type color picture tube, the tip is accurately arranged on the black stripe which constitutes the phosphor screen. In order to accurately arrange the tip of the plate supporting means on the black stripe in this way, it is preferable that the width of the tip is as narrow as possible because the arrangement margin can be widened, and the width of the black stripe is 0.07 mm.
In the case of the degree, the width of the tip portion is optimally 0.05 mm or less.

The processing of the tip of the plate supporting means is as follows.
This is done by grinding from both sides so that the cutting edge of the grinding tool approaches the center of the tip end surface of the plate supporting means, but it is one-sidedly cut, and some obstruct the electron beam passing near the tip end. Further, when the width of the tip portion is narrowed, the strength of the tip portion is reduced and the tip portion is deformed to the side opposite to the processing side, and it is difficult to finish the tip to a predetermined width.
Therefore, the processing of the tip of the plate supporting means requires ultra-low speed processing and special finishing. However, even if it is processed by such a method, the width of the tip is 0.05
It is difficult to finish with a precision of less than mm, and it is not easy to obtain a plate supporting means having a tip with a predetermined width and a good squareness in the length direction of the tip.

[0015]

As described above, the integrated structure having the flat face plate and the flat rear plate that faces the face plate in parallel through the side wall and is formed on the inner surface of the face plate. There is proposed a cathode ray tube which irradiates the phosphor screen divided into a plurality of regions with an electron beam emitted from a plurality of electron guns. In this cathode ray tube, a plurality of plate supporting means for supporting the flat face plate and the flat rear plate are arranged between them in response to an atmospheric pressure load applied to the vacuum envelope. Fe of the plate support means
If the tip end that contacts the inner surface of the base plate has a wedge shape,
Compared with the known plate supporting means composed of a long plate-shaped body or a needle-shaped body, there is an advantage that a small number can support an atmospheric pressure load and can be manufactured relatively easily.

However, the tip of the plate supporting means is
This is done by grinding from both sides so that the cutting edge of the grinding tool approaches the center of the tip end surface of the plate support means, so that one-side cutting or deformation in which the tip end falls to the opposite side of the machining side, and electrons passing near the tip end are generated. Block the beam,
Due to variations in the width of the tip and deviation of the squareness in the length direction of the tip, the atmospheric pressure load is not evenly supported, resulting in a state close to one-point support, and excessive stress is concentrated on the face plate, which may cause damage. is there. Moreover, the contact position with respect to the phosphor screen may be displaced due to the tip end falling.
In addition, the tip end portion of the plate supporting means is crushed by the atmospheric pressure load, the crushed length is shortened, and the face plate and the rear plate are bent. The crush amount of the tip of each plate support means is not necessarily the same, and changes depending on the finished state of the tip. Therefore, the amount of bending of the face plate and the rear plate becomes non-uniform according to the amount of crushing of the tip end portion of the plate supporting means, and there is a case where the portion where an excessive amount of bending is generated breaks.

The present invention has been made in order to solve the above-mentioned problems, and a plate having a wedge-shaped tip end portion that supports the flat face plate and the rear plate against the atmospheric pressure load applied to the vacuum envelope. About support means,
A method for manufacturing a highly reliable display device that avoids blocking of an electron beam due to one-side cutting of a tip portion or tilt deformation during processing, uniformly supports an atmospheric pressure load, and does not cause excessive stress concentration on a face plate, and The purpose is to obtain a display device .

[0018]

[Means for Solving the Problems] First flat surface having a substantially rectangular shape
A vacuum envelope having a plate, a side wall extending substantially perpendicularly from a peripheral edge of the first plate, and a substantially rectangular flat second plate facing the first plate in parallel through the side wall; It is arranged between the first and second plates, and the first
A phosphor screen formed on the inner surface of the first plate by an electron beam emitted from a plurality of electron guns, the plate screen having a plate-shaped end portion formed in a wedge shape and supporting the first and second plates. Is a method of manufacturing a display device in which the light is divided into a plurality of areas and irradiated ,
The foil is formed by grinding the edge of the base material that serves as the supporting means into a wedge shape.
Process and the edge ground into foil shape is 0.08mm
And a step of polishing to a flat surface having a width exceeding
It is a manufacturing method, and the plate support hand by this manufacturing method
It was formed into a structure with steps.

[0019]

As described above, the wedge-shaped tip of the end of the plate supporting means for supporting the flat first and second plates on the side of the first plate is a flat surface, and the flat surface of the tip has a width exceeding 0.08 mm. In this case, the processing accuracy of the end portion of the plate supporting means on the first plate side is improved, and there is no side cut in the grinding process or deformation in which the tip portion falls to the opposite side to the machining side. Beam blocking can be prevented. Further, since the tip end portion does not fall down during processing, the tip end portion can be accurately arranged at a predetermined position of the phosphor screen. Furthermore, it is possible to reduce the variation in the width of the tip and the deviation of the squareness of the tip, and to evenly support the first plate against the atmospheric pressure load applied to the vacuum envelope. With the flat surface having a width exceeding the width, it is possible to prevent the tip portion from being crushed or deformed due to the atmospheric pressure load, and prevent excessive stress concentration on the first plate.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on embodiments with reference to the drawings.

FIG. 1 shows the whole of a color picture tube which is one embodiment of the present invention, and FIGS.
A cross section and a BB cross section are shown, and an exploded perspective view is shown in FIG. The color picture tube is joined to a substantially rectangular flat glass face plate 20 (first plate) and a peripheral edge of the face plate 20 with a bonding material such as frit glass, and is substantially bonded to the face plate 20. A side wall 21 made of glass that extends perpendicularly to the face plate 20, and a flat rear glass plate 22 made of a substantially rectangular shape that faces the face plate 20 in parallel via the side wall 21 and is also joined by a joining material such as frit glass. 2nd plate)
And a vacuum envelope 24 composed of a plurality of glass funnels 23 that are also joined to the rear plate 22 with a joining material such as frit glass. The plurality of funnels 23 are respectively joined around a plurality of openings 25 formed in the rear plate 22, and in the illustrated example, five in the horizontal direction (X direction) and four in the vertical direction (Y direction). A total of 20 funnels 23 are shown.

On the inner surface of the face plate 20 ,
A phosphor screen 27 is formed which has a stripe-shaped three-color phosphor layer that emits blue, green, and red light and a black stripe that is provided so as to be embedded between the three-color phosphor layers. On the other hand, the mask erection means 2 is provided on the inner surface of the rear plate 22.
8 is fixed, and a shadow mask 29 facing the phosphor screen 27 at a predetermined distance is attached to the mask erection means 28. Also, a plurality of funnels 23
An electron gun 31 is sealed in each neck.
Further, a plate support means 32 composed of a plurality of metal round bars is arranged between the face plate 20 and the rear plate 22.

In this color picture tube, the electron beam emitted from each electron gun 31 is deflected horizontally and vertically by a magnetic field generated by a deflection device (not shown) mounted outside each funnel 23. The phosphor screen 27 in a plurality of areas, in the illustrated example, five in the horizontal direction,
A total of 20 regions R1 to R20 are divided in the vertical direction and irradiated with an electron beam to scan the region. The screens drawn on the phosphor screen 27 by this divided scanning are connected by a signal applied to the electron gun 31 and the deflecting device, and have a structure in which one large image with no overlap or discontinuity is reproduced on the entire surface of the phosphor screen 27. Has become.

The plate supporting means 32 is for supporting the flat face plate 20 and the rear plate 22 against the atmospheric pressure load applied to the vacuum envelope 24, and as shown in FIG. It is fixed to the rear plate so as to be positioned on each intersection of the plurality of areas R1 to R20 which are divided and irradiated by, and the tip end thereof corresponds to a black stripe formed on each intersection of the plurality of areas. Touching. In the display device which is divided into 20 regions R1 to R20 for irradiation as described above, 12 plate supporting means 32 are arranged at the intersections thereof.

As shown in FIG. 5, each plate supporting means 32 has a wedge-shaped end portion 34 of the metal round bar, that is, an end portion on the phosphor screen side that abuts on the inner surface of the face plate. The wedge-shaped inclination angle of the tip end portion 34 is close to the plate supporting means 32 so that the electron beam scanning each area is not blocked, that is, the electron beam passing near the plate supporting means 32 is not blocked. The angle is set to 50 °, which is slightly larger than the deflection angle of the passing electron beam, and its tip is slightly narrower than the width (0.1 mm) of the black stripe formed on each intersection of the plurality of regions. A flat surface having a width of 0.08 mm or more is formed in a direction orthogonal to the central axis 35 of the plate supporting means 32.

Specifically, for example, a 20-inch type
In terms of size, a phosphor screen with a size of 400 mm x 300 mm is formed horizontally and vertically on the inner surface of a flat face plate.
It is formed in a structure in which 20 pieces, that is, 4 pieces in the vertical direction, are irradiated in a divided manner. The distance from the face plate to the rear plate is 20 mm, and 12 plate supporting means are arranged at the intersections of the regions between the face plate and the rear plate. In each of the plate supporting means, the tip of a metal round bar having a length of 20 mm and a diameter of 10 mm, which is equal to the distance between the face plate and the rear plate, has a wedge shape, and the wedge-shaped tip has a length of the metal round bar. A flat surface having a diameter of 10 mm, which is the same as the diameter, and a width of 0.08 mm with respect to the width of the black stripe, 0.1 mm, is formed, and the flat surface is formed in a direction orthogonal to the central axis of the plate supporting means. ing.

The plate supporting means 32 as described above is formed by grinding and polishing, for example, the above-mentioned 20 inch.
In the plate supporting means having a size corresponding to the mold , first, a metal round bar having a diameter of 10 mm is cut into a length of about 22 mm, which is slightly longer than the final length (20 mm). Then, one end surface thereof is ground and polished so as to be substantially perpendicular to the central axis of the cut metal round bar. Next, this metal round bar is attached to a double-sided processing machine, the other end side is simultaneously approached with a grinding tool from both sides and ground into a wedge shape, and processed until the width of the tip becomes a foil shape of about 0.02 mm. When processed into a foil shape in this way, the tip portion is deformed. Next, the tip is ground so that its width is 0.08 mm and is perpendicular to the central axis of the metal round bar. After that, one end of the metal round bar having the other end formed in a wedge shape is ground and polished to have a length of 20 mm ± 0.05 mm, and one end face is perpendicular to the central axis of the metal round bar. It is manufactured by finishing.

When manufactured by such a method, the width of the wedge-shaped tip is 0.01 mm with respect to the design value (0.08 mm).
In the following, the squareness of the tip can be suppressed to 0.1 ° or less, and the plate supporting means can be formed without tipping deformation of the tip.

Although it is possible to manufacture a plate supporting means having a wedge-shaped tip width of 0.05 mm or more by the above-mentioned processing method, if the wedge-shaped tip width is narrower than 0.05 mm, The tip portion may be deformed by tilting, so that the desired plate supporting means cannot be obtained.

By the way, as described above, the flat first and second
If the tip of the wedge-shaped first plate-side end of the plate supporting means for supporting the plate is a flat surface and the flat surface of this tip is formed to have a width exceeding 0.08 mm, the first plate-side end of this plate supporting means. machining accuracy is improved, there is no deformation pieces scraped and tip in grinding from falling to the opposite side of the working side, the electron beam passing through the distal end portion vicinity can be prevented by shielding. Further, since the tip end portion does not fall down during processing, the tip end portion can be accurately arranged at a predetermined position of the phosphor screen. Further, it is possible to reduce the variation in the width of the tip and the deviation of the squareness of the tip, and to evenly support the first plate against the atmospheric pressure load applied to the vacuum envelope.
With the flat surface having a width exceeding mm, the tip portion is prevented from being crushed or deformed by the atmospheric pressure load, and the first plate can be efficiently supported by a small number so as not to cause excessive stress concentration.

In the above embodiment, the wedge shape at the tip of the plate supporting means is formed by grinding and polishing.
As the final finishing of this wedge shape, apply a load equivalent to the atmospheric pressure load applied to the vacuum envelope to its tip surface,
Stabilization or smoothing may be performed.

[0032]

Further, in the above embodiment, the plate supporting means composed of a round bar has been described, but the plate supporting means may be a plate 37 as shown in FIG. 6A or a block as shown in FIG. 6B. It is also possible to use one in which one end of 38 has a wedge shape.

In the above embodiment, the plate supporting means is directly fixed to the rear plate. However, the plate supporting means is formed by joining a rear plate made of glass, for example, to a rear plate and a fixing member having a similar thermal expansion, It is also applied when fixing to this fixing member.

In the above embodiment, the plate supporting means is made of metal, but the plate supporting means can be made of other materials such as glass and ceramics.

Although the color picture tube has been described in the above embodiments, the present invention can be applied to other display devices having a flat face plate.

[0037]

According to the manufacturing method of the present invention, the supporting hand is
Grind the stepped base material into a wedge shape until the tip becomes a foil shape
Processed, then the width of this tip is flat and exceeds 0.08 mm
The plate support means for polishing the surface
The processing accuracy of the tip of the
It can be accurately arranged at a predetermined position in the lean. Furthermore, it is possible to reduce the variation in the width of the tip and the deviation of the squareness of the tip, and to evenly support the first plate against the atmospheric pressure load applied to the vacuum envelope. Since the flat surface having the width exceeding the width prevents the tip portion from being crushed or deformed by the atmospheric pressure load, it is possible to prevent excessive stress concentration on the first plate, and a large number of plate supporting means can be used. An effect that it can be a display device that efficiently supports atmospheric pressure load
It is something.

[Brief description of drawings]

FIG. 1 is a perspective view showing the overall configuration of a color picture tube that is an embodiment of the present invention.

FIG. 2A is a view of the color picture tube A- shown in FIG.
Sectional view A and FIG. 2B are sectional views taken along line BB.

FIG. 3 is an exploded perspective view of the color picture tube.

FIG. 4 is a diagram showing an arrangement of plate supporting means in the color picture tube.

FIG. 5 is a view showing a structure of plate supporting means of the color picture tube.

6 (a) and 6 (b) are views showing different structures of the plate supporting means, respectively.

7 (a) is a perspective view showing the structure of a conventional picture tube, and FIG. 7 (b) is a sectional view thereof.

FIG. 8 is a diagram showing a structure of a plate supporting means of a cathode ray tube according to a prior application of the present application.

[Explanation of symbols]

20 ... Face plate 21 ... Side wall 22 ... Rear plate 23 ... Funnel 24 ... Vacuum envelope 27 ... Phosphor screen 28 ... Mask erection means 29 ... Shadow mask 31 ... Electron gun 32 ... Plate supporting means R1 to R20 ... area

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Haraguchi 1-9-2 Harara-cho, Fukaya-shi, Saitama Prefecture Fukaya Electronics Factory, Toshiba Corporation (72) Eiji Kambara 1-chome, Harara-cho, Fukaya-shi, Saitama No. 2 Stock company Toshiba Fukaya Electronics Factory (56) Reference JP-A-5-36363 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01J 9/24 H01J 29 / 86-29/87 H01J 31/00

Claims (8)

(57) [Claims] 1. A flat first plate having a substantially rectangular shape, a side wall extending substantially vertically from a peripheral portion of the first plate, and a substantially rectangular shape parallel to and facing the first plate through the side wall. A vacuum envelope having a flat second plate, and a plate that is disposed between the first and second plates and has a wedge-shaped end on the first plate side to support the first and second plates. A method of manufacturing a display device, comprising: a supporting means, and irradiating a phosphor screen formed on the inner surface of the first plate with a plurality of regions divided by an electron beam emitted from a plurality of electron guns. , the step of producing the plate supporting the hand stage, the steps of the foil-like end portion of the substrate serving as the support means is ground into a wedge shape, a 0.08mm grinding by end to the foil Polish to a flat surface with a width exceeding Method of manufacturing a display device characterized by comprising: a degree, the. 2. The base material that becomes the support means is made of metal
The method for manufacturing a display device according to claim 1, wherein: 3. The base material that serves as the support means is made of glass.
The method for manufacturing a display device according to claim 1, wherein: 4. The base material that serves as the support means is made of ceramic.
A method of manufacturing a display device according to claim 1, wherein
Law. 5. The base material to be the supporting means has a round bar shape
The method for manufacturing a display device according to claim 1, wherein 6. The base material that serves as the support means has a plate shape.
The method for manufacturing a display device according to claim 1, wherein: 7. The base material that is the support means has a block shape
A method of manufacturing a display device according to claim 1, wherein
Law. 8. A flat first plate having a substantially rectangular shape,
A sidewall extending substantially vertically from the peripheral edge of the first plate
And parallel to the first plate through the side wall
Vacuum envelope having a substantially rectangular flat second plate
Is disposed between the first and second plates, and the first plate
The rate-side end portion is formed in a wedge shape, and the first and second plates are formed.
Plate supporting means for supporting the
The electron beam emitted from the gun causes the first plate
The phosphor screen formed on the inner surface is divided into multiple areas.
A display device for splitting and irradiating, wherein the plate supporting means is a base material end part to be the supporting means.
Is formed into a foil shape by grinding, and this edge can be ground.
A flat surface with a width exceeding 0.08 mm formed by
Display having a wedge-shaped tip portion
apparatus.