JPH0765723A - Manufacture of color picture tube - Google Patents

Abstract

PURPOSE:To ensure high positioning accuracy for the support body of a plate or the like by using a mounting jig having a coupling groove formed along the lengthwise direction thereof in such a way as corresponding to a black stripe, and coupling and fixing the wedge shape end of the jig to the coupling groove. CONSTITUTION:A rear plate 3 is placed on the horizontal reference plane 28H of a lower jig 29 with a fixing member 24 up, and one edge of the rear plate 3 is pressed against the vertical reference plane 28V of the jig 29, thereby positioning the rear plate 3. A support body 22 is erected on the member 24, and an upper jig 31 is placed thereon and pertinently pressed so that the wedge shape end of the support body 22 is coupled to a coupling groove 31. Then, one edge of the jig 31 is pressed to the reference plane 28V of the jig 29 and a force in the direction of an arrow 35 is applied to the forward end of the support body 22 via a block 34. In this state, the reference plane of the support body 22 is kept in contact with the reference plane 30 of the jig 31, thereby positioning the rear plate 3. Thereafter, the base end of the support body 22 is welded to a member 24 via laser welding or the like, thereby assembling a color picture tube using the rear plate 3 with the fixed support body 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 picture tube, and in particular, a support for supporting a flat face plate and a rear plate is disposed between the flat face plate and the rear plate, and a fluorescent material formed on the inner surface of the face plate. The present invention relates to a method for manufacturing a color picture tube in which a body screen is divided into a plurality of areas and scanned.

[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 used as a home television receiver or as 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 disclose a structure in which a plurality of independent picture tube screens are integrated. Has been done. A picture tube having a phosphor screen with this integrated structure is constructed by a face plate on which the phosphor screen is formed, a rear plate arranged facing the face plate, and a plurality of funnels connected to the rear plate to form a vacuum. An envelope is constructed, the face plate of which is glass and the rear plate is of glass or metal.

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

In order to solve such a problem, a face plate is conventionally flattened, and a phosphor screen formed on the inner surface of the face plate is irradiated with a plurality of regions by an electron beam emitted from a plurality of electron guns. There is a cathode ray tube which is divided into two parts and scanned. In such a cathode ray tube, it is necessary to dispose a support inside to support an atmospheric pressure load applied to the face plate.

The placement of a support inside a flat face plate to carry atmospheric loads in this manner is known in relation to solar heat collectors which create a vacuum inside the envelope. Also, as a flat cathode ray tube, Japanese Patent Laid-Open No. 56-106
353, JP-A-62-272432, JP-A-62-285335, and JP-A-63-12853.
No. 2, JP-A-48-90183, JP-A-64
It is disclosed in Japanese Patent Laid-Open No. 10553, Japanese Patent Laid-Open No. 1-117521, and the like.

As a practical structure of such a cathode ray tube, the inventors have shown in FIGS. 4 (a) and 4 (b):
A substantially rectangular flat glass face plate 1, and a side wall 2 joined to the peripheral edge of the face plate 1,
From a substantially rectangular flat glass rear plate 3 which is opposed to the face plate 1 through the side wall 2 and is joined in parallel, and a plurality of funnels 4 which are joined to the opening of the rear plate 3. A plurality of phosphor screens 8 formed on the inner surface of the face plate 1 by electron beams emitted from a plurality of electron guns 7 arranged in the neck 6 of the funnel 4. A color picture tube has been developed which is divided into 20 areas, in the example shown, divided into 20 areas R1 to R20 for scanning. In this color picture tube, a plurality of metal supports 9 are arranged between the face plate 1 and the rear plate 3 to support the atmospheric pressure load applied to the flat face plate 1. As shown in FIG. 5, the support 9 has a prismatic shape with a tip portion (end portion on the face plate 1 side) formed in a wedge shape, and the wedge-shaped tip has a length L of 2 to 30 mm. ing.

In FIG. 4B, 10 is a shadow mask for selecting the electron beam emitted from the electron gun 7, and 11 is an outside of the funnel 4 for deflecting the electron beam emitted from the electron gun 7. It is a mounted deflection device.

Compared with the plate-shaped or needle-shaped support disclosed in the above publication, such a support 9 is easier to process, can be processed with high precision, and is less likely to be deformed, so that a color image can be received. Assembling accuracy in the pipe is improved. In addition, the number of built-in color picture tubes can be greatly reduced compared to the needle-shaped support. Therefore, the assembly of the color picture tube becomes easy. Specifically, in a color picture tube which scans the phosphor screen 8 by dividing it into 20 areas, a support body having a wedge-shaped tip with a length L of 15 mm is provided in each of the divided areas.
It was possible to achieve the purpose sufficiently just by arranging it at the boundary part of.

FIG. 6 shows the phosphor screen 8 of the support 9 described above.
Shows the arrangement for. The phosphor screen 8 of the color picture tube of this example comprises three vertically aligned striped three-color phosphor layers 13B, 13G and 13R which emit blue, green and red and the three-color phosphor layers 13B, 13G and 13R. The black stripes 14 are provided so as to fill the gaps between the black stripes 14 and the supporting body 9 has a wedge-shaped tip whose length direction is located on each intersection of each of the divided areas.
The black stripes 14 are arranged on the center line thereof so as not to extend in the width direction of the black stripe 14 so as to coincide with the longitudinal direction thereof.

In this case, for example, the three-color phosphor layer 13B,
If the arrangement pitch of 13G and 13R is 0.6 mm and the area ratio of the black stripes 14 is 50%, the width of the black stripes 14 is 0.1 mm.
It is desired that the width of the wedge-shaped tip be 0.01 mm or less. In this way, the width of the wedge-shaped tip of the support 9 is set to 0.01.
It is possible to reduce the thickness to mm or less by polishing. However, even if the wedge-shaped tip is formed to have a width of 0.01 mm or less, in order to dispose the wedge-shaped tip inside the envelope, the face plate 1, the side wall, the rear plate, etc. are joined to form the envelope 5.
Must be arranged before the formation of the black stripes, and must be arranged with an accuracy of about ± 0.03 mm with respect to the black stripe 14. If you do not place it with such accuracy,
When the phosphor screen 8 is scanned by the electron beam,
The support 9 is shaded on the phosphor screen 8 and the quality of the image is deteriorated.

As a method of arranging the support 9 with high accuracy, Japanese Patent Application No. 3-343804 discloses that a plate-like fixing member is joined to the inner surface of the rear plate by frit glass.
A method is shown in which the outer shape of the support body 9 is brought into contact with the reference surface provided on the mounting jig on the fixing member to mount the supporting body with high accuracy.

When the fixing member is joined to the rear plate and the support is attached to the fixing member as described above, the mounting accuracy can be improved, but the mounting cannot be performed to a desired accuracy. This is because when the support member is attached to the fixing member, the support member is positioned with reference to the side surface of the support member, but the side surface and the wedge-shaped tip are not formed with sufficient accuracy.

That is, in the support 9, the base material is cut into the length of the support 9, and thereafter, the tip end portion thereof abutting the phosphor screen is wedge-shaped with a predetermined width so that the tip end portions thereof are from both sides. It is manufactured by cutting and polishing.

On the other hand, if the support 9 has a coefficient of thermal expansion significantly different from that of the glass forming the envelope, it is unnecessary for the envelope due to the difference in thermal expansion due to heating in the manufacturing process of the color picture tube. Stress occurs and, in the worst case, causes the destruction of the envelope. Therefore, as the material of the support 9, a material having a coefficient of thermal expansion close to that of the glass forming the envelope is selected, and a Ni alloy is used. However, since this Ni alloy is relatively soft as a metal material, it deforms during processing. Especially Figure 5
Since most of the side surface of the prism-shaped support 9 shown in FIG. 2 must be processed, the pressurization of the processing tool causes the warp deformation shown by the solid line in FIG.
It cannot be finished with sufficient accuracy.

Therefore, even if the outer shape of such a support 9 is brought into contact with the reference surface of the mounting jig as described above and positioned, as shown in FIG. 8 (a), the wedge-shaped tip 16 is The phosphor layer 13B is displaced from the predetermined black stripe 14
, 13G, 13R (13G in the illustrated example), or a wedge-shaped tip 16 as shown in FIG.
Part of the black stripe 14 protrudes from the black stripe 14, and a shadow that the electron beam does not hit is formed on the screen, impairing the image quality.

Further, in order to prevent such processing deformation of the support body 9, if the precision processing which does not easily deform is applied, the processing takes time and the cost becomes high.

[0020]

As described above, as a color picture tube having a high resolution, a short depth, an easy-to-see screen, a simple structure, a high practical value, and a high industrial value, the face plate is flattened. A color picture tube has been proposed in which a phosphor screen formed on the inner surface is divided into a plurality of areas and scanned. This color picture tube requires support means for supporting the atmospheric pressure load applied to the flat face plate. As a practical structure of such a color picture tube, the present inventors set the length of the tip on the face plate side where the supporting means is in contact with the phosphor screen to 2
We have developed a color picture tube which is composed of a wedge-shaped prismatic metal support of ~ 30 mm, and which is placed at the intersection of a plurality of divided areas of the phosphor screen. In the case of a color picture tube in which the phosphor screen is composed of a stripe-shaped three-color phosphor layer and a black stripe, the support is arranged on the black stripe located at the intersection of each divided region in the width direction of the black stripe. It must be placed with high precision so that it does not stick out or stick out.

As a method for arranging the support with high accuracy in this manner, a method is proposed in which a fixing member is joined to the inner surface of the rear plate and the supporting member is mounted on the fixing member with high accuracy by using a mounting jig. Has been done. However, in this method, the outer shape of the support is used as a reference, but since the wedge-shaped tip of this support is not formed with sufficient accuracy, the support cannot be arranged with the desired accuracy. , It may come off or stick out in the width direction of the black stripe,
There is a problem that the shadow of the support is formed on the screen and the quality of the image is impaired.

The present invention has been made to solve the above problems, and has a flat face plate,
An object of the present invention is to enable a support for supporting a face plate of a color picture tube, which scans a phosphor screen formed on its inner surface divided into a plurality of regions, to be accurately arranged at a predetermined position. .

[0023]

[Means for Solving the Problems] First flat surface having a substantially rectangular shape
A vacuum envelope comprising 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; A phosphor screen composed of a stripe-shaped three-color phosphor layer formed on the inner surface of the first plate and a black stripe provided between the three-color phosphor layers, and a tip portion formed in a wedge shape. A support body disposed between the first and second plates so that the length direction of the tip coincides with the longitudinal direction of the black stripe and is located on the black stripe, and supports the first and second plates. In a method of manufacturing a color picture tube in which a phosphor screen is divided into a plurality of regions and scanned by an electron beam emitted from a plurality of electron guns, a black stripe is supported. Using a mounting jig direction of the fitting groove is formed which coincides with the longitudinal direction of the black stripe,
A wedge-shaped tip portion was fitted in the fitting groove of this mounting jig to position and fix the support.

[0024]

As described above, the attachment jig having the fitting groove formed in the direction corresponding to the longitudinal direction of the black stripe is formed corresponding to the black stripe, and the wedge-shaped tip is formed in the fitting groove of the attachment jig. When the parts are fitted and the support is positioned and fixed, the tip of the support can be accurately arranged on the black stripe. Further, the tip portion of the support can be accurately aligned with the longitudinal direction of the black stripe, and the support cannot be shaded on the screen.

[0025]

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

FIG. 1 shows a color picture tube according to the embodiment. The color picture tube is joined to a substantially rectangular flat face plate 1 (first plate) made of glass and a peripheral portion of the face plate 1.
A side wall 2 extending substantially perpendicular to the side wall 2
It is composed of a substantially rectangular flat glass rear plate 3 (second plate), which is joined in parallel with the face plate 1 via the glass plate, and a plurality of glass funnels 4 joined to the rear plate 3. It has a vacuum envelope 5. The plurality of funnels 4 are joined around a plurality of openings 20 formed in the rear plate 3, and in the illustrated example, five funnels 4 in the horizontal direction and four in the vertical direction, a total of 20 funnels 4 are formed. It is joined.

On the inner surface of the face plate 1, blue,
A phosphor screen 8 including a three-color phosphor layer that emits green and red light and a black stripe provided between the three-color phosphor layers is formed. The phosphor screen 8 faces the phosphor screen 8 and will be described later inside thereof. A shadow mask 10 having an effective portion in which a large number of electron beam passage holes are formed is arranged corresponding to a plurality of regions M1 to M20, and is supported by a mask erection means 21 fixed to a rear plate 3. An electron gun 7 that substantially emits three electron beams is disposed in each neck 6 of the plurality of funnels 4.

Further, as shown in FIG. 2, a plurality (12 in the illustrated example) of metal supports 22 are arranged on the intersections of a plurality of regions M1 to M20 between the face plate 1 and the rear plate. Has been done. The support 22 supports an atmospheric pressure load applied to the face plate 1 of the vacuum envelope 5, and is formed of a prismatic body having a wedge-shaped tip (end on the face plate side). This support 22
Is the fixing member 24 fixed to the inner surface of the rear plate 3 by the frit glass 23 so that the lengthwise direction of the wedge shape of the tip portion coincides with the longitudinal direction of the black stripe on each intersection of the plurality of regions. It is fixed so that it is located on the center line. The fixing member 24 is formed in a larger area than the base end surface of the support 22.

In this color picture tube, the electron beams emitted from the plurality of electron guns 7 are supplied to the respective funnels 4.
It is deflected in the horizontal and vertical directions by a deflection yoke 11 mounted on the outside of the, and the phosphor screen 8 is divided into a plurality of regions through the effective portion of the shadow mask 10, in the illustrated example, five in the horizontal direction and five in the vertical direction. 4 areas, total 20 areas M1 ~
Divide into M20 and scan. The images drawn on the phosphor screen 8 by this divided scanning are connected by the signals applied to the electron gun 7 and the deflection yoke 11, and one large continuous image without reproduction or discontinuity is reproduced on the entire surface of the phosphor screen 8. To be done.

Next, a method of manufacturing this color picture tube will be described.

A phosphor screen 8 consisting of a three-color phosphor layer and a black stripe is previously formed on the inner surface of the face plate 1 by photo printing, for example, using a master mask having a predetermined stripe pattern formed thereon. . Further, the fixing member 26 is previously bonded to the inner surface of the rear plate 3 corresponding to the intersections of the plurality of regions divided and scanned by the electron beam by the frit glass 25. At this time, at the same time, the mask erection means 21
Join. This fixing member 26 is joined to the support 2
Since the area is larger than that of the base end portion of 2, the precision is not required so much. The electron gun 7 is sealed in advance in each neck 6 of the plurality of funnels 4.

Next, as shown in FIG. 3, the horizontal reference plane 2
Lower jig 2 with vertical reference plane 28V at one end of 8H
9, a reference surface 30 that abuts the side surface of the support 22 to position the support 22, and a plurality of regions R1 to R20 of the phosphor screen 8 that are divided and scanned by the electron beam.
Supports 2 corresponding to the black stripes on each intersection of
A plurality of fixing jigs 24 are fixed on the rear plate 3 by using a mounting jig 33 including an upper jig 32 in which a fitting groove 31 that fits to the wedge-shaped tip portion of the second jig 2 is formed. Position the support 22.

That is, the rear plate 3 is placed on the horizontal reference surface 28H of the lower jig 29 with the fixing member 24 facing upward, and one end surface of the rear plate 3 is pressed against the vertical reference surface 28V for positioning. Then, the support 22 is erected on the fixed member 24 of the rear plate 3 which is positioned, the upper jig 31 is placed on the support 22, and the wedge-shaped support 22 is formed in the fitting groove 31. The tip portion is fitted and the upper jig 31 is appropriately pressed. Further, one end surface of the upper jig 31 is pressed against the vertical reference surface 28V of the lower jig 29, and a force in the direction of arrow 35 is applied to the tip end side of the support body 22 through the block 34 to position the support body 22. The reference surface is pressed against the reference surface 30 of the upper jig 31 for positioning. Then, the base end of the positioned support 22 is welded to the fixing member 24 by, for example, laser welding. Then, a color picture tube is assembled using the rear plate 3 having the support 22 fixed thereto.

To assemble the color picture tube, the shadow mask 10 is first welded to the mask erection means 21 fixed to the rear plate 3 together with the support 22 as described above. Then, a face plate 1 having a phosphor screen 8 formed on its inner surface, a side wall 2, a rear plate 3 having the support 22 and the shadow mask 10 attached thereto, and a neck 6 are formed.
The plurality of funnels 4 with the electron gun 7 sealed therein are positioned in a predetermined relationship using an assembly jig, and they are joined by frit glass. Then, the assembled envelope 5 is exhausted.

By the way, when the support 22 is mounted on the rear plate 3 as described above, a plurality of regions R1 to R of the phosphor screen 8 are divided and scanned by the electron beam.
Support 2 corresponding to the black stripes on each intersection of 20
When the positioning is performed using the mounting jig 33 having the upper jig 32 in which the fitting groove 31 into which the wedge-shaped tip portions of 2 are fitted, the wedge-shaped tip portions of all the support bodies 22 are divided into a plurality of regions. It can be accurately positioned so as not to shift in a direction orthogonal to the black stripe on each intersection. Further, the lengthwise direction of the wedge-shaped tips of all the supports 22 can be aligned with the longitudinal direction of the black stripes on each intersection of the plurality of regions R1 to R20, and the positioning can be performed so as not to protrude from the black stripes. As a result, the phosphor screen 8 can be divided into a plurality of regions R1 to R20 and scanned so that the shadow of the support 22 can be prevented from appearing on the screen to be drawn, and a color image for reproducing a good image can be received. It can be a tube.

In the above embodiment, the case where the support has a prismatic shape has been described, but the present invention can be applied to a support having another shape such as a cylindrical shape, and the same effect can be obtained.

In the above embodiment, the case where the support is positioned and fixed to the rear plate via the plate-shaped fixing member has been described. However, the positioning and fixing of the support is fixed to a member other than the plate-shaped fixing member. The same effect can be obtained in the case of fixing or by other means such as directly bonding to the rear plate with frit glass.

In the above embodiment, the case where all of the plurality of supports are arranged in a matrix at the same time has been described. However, the plurality of supports are arranged in the column or row direction of the matrix arrangement. However, it can also be applied to the case where they are combined and then arranged in a matrix.

[0039]

The first flat plate having a substantially rectangular shape, the side wall extending substantially vertically from the peripheral portion of the first plate, and the substantially rectangular shape parallel to the first plate through the side wall. A vacuum envelope having a flat second plate, and stripe-shaped three formed on the inner surface of the first plate.
A phosphor screen composed of a color phosphor layer and a black stripe provided between the three-color phosphor layers, and a tip portion formed in a wedge shape, and the length direction of the wedge-shaped tip is the same as the longitudinal direction of the black stripe. Then, it is arranged between the first and second plates so as to be located on the black stripe, and has a support for supporting these first and second plates, and by an electron beam emitted from a plurality of electron guns, In a method for manufacturing a color picture tube in which a phosphor screen is divided into a plurality of areas and scanned, a mounting jig having a fitting groove formed in a direction corresponding to the longitudinal direction of the black stripe is formed corresponding to the black stripe. When the support is positioned by fitting the wedge-shaped tip into the fitting groove of this mounting jig, the tip of the support can be accurately placed on the black stripe. Kill. Moreover, the length direction of the tip of the support can be accurately aligned with the longitudinal direction of the black stripe. As a result, it is possible to prevent the shadow of the support on the screen drawn by dividing the phosphor screen into a plurality of regions and scanning,
It is possible to provide a color picture tube that reproduces a good quality image.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main configuration of a color picture tube according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining an arrangement position of a support in the color picture tube.

3 (a) and 3 (b) are views for explaining a method of fixing a support member to a rear plate thereof.

FIG. 4 (a) is a perspective view showing the structure of a conventional color picture tube, and FIG. 4 (b) is a sectional view showing the structure of the main part thereof.

FIG. 5 is a perspective view showing a structure of a support for the conventional color picture tube.

FIG. 6 is a diagram showing an arrangement of supports on a phosphor screen.

FIG. 7 is a diagram for explaining a problem of a conventional support.

8 (a) and 8 (b) are views for explaining problems in the arrangement of the support with respect to the phosphor screen.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Face plate (1st plate) 2 ... Side wall 3 ... Rear plate (2nd plate) 4 ... Funnel 5 ... Vacuum envelope 7 ... Electron gun 8 ... Phosphor screen 10 ... Shadow mask 21 ... Mask installation means 22 ... Support 24 ... Fixing member 26 ... Fixing member 29 ... Lower jig 30 ... Reference surface 31 ... Fitting groove 32 ... Upper jig R1 to R20 ... Area

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Haraguchi 1-9-2 Harara-cho, Fukaya-shi, Saitama Inside Fukaya Electronics Factory, Toshiba Corporation (72) Eiji Kamaba 1-chome, Harara-cho, Fukaya, Saitama No. 2 inside Toshiba Fukaya Electronics Factory

Claims (1)

[Claims] 1. A substantially rectangular flat first plate, 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, a phosphor screen having a stripe-shaped three-color phosphor layer formed on the inner surface of the first plate, and a black stripe provided between the three-color phosphor layers. And the tip portion is formed in a wedge shape, and is arranged between the first and second plates such that the length direction of the tip end of the wedge shape coincides with the longitudinal direction of the black stripe and is located on the black stripe. And a support for supporting these first and second plates, and the phosphor screen is divided into a plurality of regions and scanned by an electron beam emitted from a plurality of electron guns. -In the method of manufacturing a picture tube, a mounting jig having a fitting groove formed in a direction corresponding to the longitudinal direction of the black stripe corresponding to the black stripe is used, and the fitting groove of the fitting jig has a wedge shape. A method for manufacturing a color picture tube, characterized in that the support is positioned and fixed by fitting the front end of the.