JP2000200567A - Cathode ray tube - Google Patents

Abstract

(57) [Problem] To provide a cathode ray tube that divides and scans a phosphor screen with electron beams emitted from a plurality of electron guns, while maintaining the symmetry of each divided screen and reducing the depth. Another object of the present invention is to provide a cathode ray tube having a sufficient strength against an atmospheric load. A vacuum envelope has a glass panel having a phosphor screen formed on an inner surface thereof, and two glass funnels each having a neck. An electron gun is arranged in the neck of each funnel. The two funnels are joined to each other via a joint, and are joined to the panel. A beam-shaped reinforcing member 26 is fitted to the panel, and is connected to the joint of the funnel to reinforce the joint.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube, and more particularly, to a cathode ray tube which scans a phosphor screen by dividing the screen into a plurality of regions by electron beams emitted from a plurality of electron guns.

[0002]

2. Description of the Related Art In recent years, various studies have been made to meet demands for a high-definition cathode-ray tube for high-definition broadcasting or a large screen associated therewith. In order to achieve a higher resolution of the cathode ray tube, the electron beam spot diameter on the phosphor screen must be reduced.

[0003] On the other hand, conventionally, an attempt has been made to improve the electrode structure of an electron gun or to enlarge and extend the diameter of the electron gun itself, but no satisfactory results have yet been obtained. The biggest cause of this is that the distance from the electron gun to the phosphor screen increases as the size of the cathode ray tube increases, and the magnification of the electron lens becomes too large. Therefore, it is important to reduce the distance (depth) from the electron gun to the phosphor screen in order to realize high resolution. Further, if the deflection angle of the electron beam is wide, the magnification difference between the center and the periphery of the screen increases. For this reason, wide-angle deflection is not advantageous for achieving high resolution.

To solve the above-mentioned problems of the conventional cathode ray tube, for example, US Pat.
No. 1706, U.S. Pat. No. 4,777,407, JP-A-50-17167, and JP-B-39-25.
No. 641, JP-B-42-4928, JP-B-5
Japanese Patent Laid-Open No. 4-12035 discloses a cathode ray tube having a glass funnel having a plurality of necks and having a structure in which a phosphor screen is integrated.

[0005] That is, such a cathode ray tube has a vacuum envelope comprising a panel, a funnel connected to the panel and having two funnel-shaped cones, and two necks connected to the funnel. It has a vessel. A deflection device is mounted outside each funnel cone, and an electron gun is disposed inside each neck.

In the cathode ray tube having the above structure, the electron beams emitted from the respective electron guns are deflected by the magnetic fields generated by the corresponding deflecting devices, and the corresponding two phosphor screens integrally formed on the inner surface of the panel. Is divided and scanned. The images drawn on the phosphor screen by the divided scanning are connected by controlling signals applied to the electron gun and the deflecting device, thereby reproducing one image having no cut or overlap on the front surface of the phosphor screen.

In such a cathode ray tube, in order to smoothly connect the rasters of the respective divided regions continuously and without any breaks or overlaps between adjacent regions, the size of the rasters in each region is the same and the symmetry in the vertical and horizontal directions is obtained. It is desirable to have Therefore, it is desirable that the panel shape on which the phosphor screen is formed be formed as flat as possible, and that the electron guns be arranged such that the central axis of the neck inside each electron gun passes through the center of each divided region. .

[0008]

In a cathode ray tube in which a phosphor screen is divided into a plurality of areas by an electron beam emitted from a plurality of electron guns and scanned as described above, the distance from the electron gun to the phosphor screen is large. Can be shortened to reduce the depth. However, in this case, the funnel has a flat shape as compared with the conventional cathode ray tube, and the strength against the atmospheric pressure load is reduced. In particular, the strength of the concave portion facing the boundary between the divided regions and connecting the funnel-shaped cones becomes weak. Such a decrease in strength is particularly remarkable for a large cathode ray tube.

In order to prevent this, if the portion where the funnel-shaped cones are connected to each other has a substantially flat shape, the strength of this portion against atmospheric pressure load will not decrease so much, but the strength of the portion where the curvature of the funnel is large will be reduced. descend.
Further, when the entire funnel is formed in a convex shape by inclining the neck, the funnel shape is relatively close to that of a conventional cathode ray tube, so that the strength against an atmospheric pressure load can be maintained. However, in this case, since the neck is tilted, the symmetry in each area of the divided screen is lost,
It is very difficult to smoothly and continuously connect rasters in each area without any break or overlap between adjacent areas. Furthermore,
Since the neck is tilted, it becomes very difficult to mount and adjust the deflection device.

Therefore, in order to obtain a sufficient strength against the atmospheric pressure load applied to the cathode ray tube while maintaining a reduced depth, the thickness of the panel and the funnel must be increased. However, the wall thickness of the neck is usually 1-3
mm, the portion near the funnel neck cannot be thickened. In addition, when the thickness of the neck is increased, it is difficult to seal the electron gun.

Further, increasing the thickness of the portion of the funnel-shaped cone where the deflecting device is mounted must be avoided since the deflecting sensitivity of the electron beam is greatly reduced. That is, if the thickness of this portion is increased, the current value required to deflect the electron beam to the same position on the phosphor screen increases, and the power of the entire cathode ray tube increases, which is a problem. Therefore, it is necessary to maintain the current thickness of the funnel from the vicinity of the neck to the portion where the deflection device is mounted, and the thickness of the concave portion connecting the funnel-shaped cones cannot be so large.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a cathode ray tube that divides and scans a phosphor screen with electron beams emitted from a plurality of electron guns, and a divided screen in each area. It is an object of the present invention to provide a cathode ray tube which can reduce the depth while maintaining the symmetry of the above, and which has sufficient strength against an atmospheric pressure load.

[0013]

In order to achieve the above object, a cathode ray tube according to the present invention comprises a glass panel having a phosphor screen formed on an inner surface thereof, and a funnel formed of glass having a plurality of necks. A vacuum envelope having a plurality of deflecting devices provided on the funnel portion,
A plurality of electron guns respectively arranged in the neck and scanning the phosphor screen by dividing the phosphor screen into a plurality of regions by an electron beam; and a portion corresponding to a boundary of the plurality of regions in the vacuum envelope. And a reinforcing member for reinforcing the above.

According to the cathode ray tube having the above-described structure, even when the depth is reduced and the funnel portion has a flat shape as compared with the conventional cathode ray tube, it corresponds to the boundary of a plurality of regions in the vacuum envelope. By providing the reinforcing member in the portion, the strength of this portion with respect to the atmospheric pressure load can be reinforced. Therefore, the strength of the entire vacuum envelope can be kept equal to or higher than that of the conventional cathode ray tube.

According to the cathode ray tube of the present invention,
The reinforcing member faces a boundary between the plurality of regions, and is joined to the funnel portion, the glass panel, or both.

Further, according to the cathode ray tube according to the present invention,
The plurality of necks extend substantially parallel to each other, and are arranged on a normal passing through the center of a corresponding region of the phosphor screen.

According to the above configuration, since it is not necessary to tilt the neck to make the entire funnel portion convex, the symmetry in each area of the divided screen can be maintained, and the raster of each area can be maintained between adjacent areas. It is easy to smoothly connect continuously without breaks or duplication.

Further, according to the cathode ray tube according to the present invention,
The funnel portion includes a plurality of funnels that are joined to each other by a joining portion facing a boundary of the region and that are provided to face the plurality of regions, respectively.
The plurality of necks are respectively joined to the plurality of funnels, and the reinforcing member is joined to a joint of the funnels.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a cathode ray tube according to an embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 to 4, the cathode ray tube has a vacuum envelope 10, which comprises a panel 12 made of glass and two funnels joined to the panel. And two glass funnels 16 each having a cone-shaped portion 14. Panel 12
Has a substantially rectangular face plate 18 having a rectangular phosphor screen 15 formed on an inner surface thereof, and a skirt portion 20 erected on a peripheral portion of the face plate. Panel 12 has a major axis X and a minor axis Y that are orthogonal to each other through its center. The skirt portion 20 has a pair of long side walls 20a extending substantially parallel to the long axis X.
A pair of short side walls 20b extending substantially parallel to the short axis Y;
have.

The two funnels 16 constitute a funnel portion according to the present invention. A neck 22 is joined to the cone portion 14 of each funnel 16, and an electron gun 24 is disposed in the neck. . The two funnels 16 are joined to each other, and the joint 25
A prismatic reinforcing member 26 made of glass is joined. A deflection device 2 for deflecting the electron beam emitted from the electron gun 24 is provided on the outer periphery of the cone portion 14 of each funnel 16.
8 is attached.

As shown by a two-dot chain line in FIG. 2, in this embodiment, the phosphor screen 15 has two divided areas A and B arranged in the long axis X direction with the short axis Y as a boundary. I have. These divided areas A and B have the same shape as each other and are formed symmetrically in the vertical and horizontal directions with respect to each other. The two funnels 16 are arranged so as to face the divided areas A and B, respectively, and the joint 25 of these funnels is located opposite the boundary 32 between the divided areas A and B. Each neck 22 and electron gun 24
Are arranged on a normal line 31 passing through the center of the corresponding divided area. Accordingly, the two necks 22 extend substantially parallel to each other.

As shown in FIG. 3 and FIG.
6 is attached to the skirt portion 20 of the panel 12, extends between the pair of long side walls 20a in parallel with the short axis Y, and faces the boundary 32 between the divided areas A and B. The joint 25 of the funnel 16 is joined to a reinforcing member 26 and reinforced by this reinforcing member.

According to the above-structured cathode ray tube, the electron beams emitted from the two electron guns 24 are deflected by the magnetic fields generated from the corresponding deflecting devices 28, respectively, so that the divided areas A and B of the phosphor screen 15 are divided. An image (or raster) is formed on each divided area by scanning horizontally and vertically, respectively. Each raster formed is equal in size to each of the divided areas A and B, and one large raster is formed on the phosphor screen by seamlessly connecting the rasters seamlessly. In this case, as described above, the two necks 2
2 are arranged substantially in parallel, the mounting and adjustment of the deflection device 28 can be easily performed.

Next, a method of manufacturing the cathode ray tube configured as described above will be described. First, as shown in FIG.
A panel 12 made of glass, two funnels 16 each having a cone portion, two necks 22, and a reinforcing member 26 are prepared. The panel 12 and the funnel 16 are formed by pressing, similarly to a conventional cathode ray tube. The end surface of the skirt portion 20 forms a sealing surface 12a for joining the funnel 16, and the sealing surface 12a
Is processed flat. On the inner surface of each long side wall 20a of the skirt portion 20, a concave portion 36 for fitting an end portion of the reinforcing member 26 is formed at a central portion in the long axis X direction. I have. These recesses 36
Are formed simultaneously when the panel 12 is pressed.

The end face on the large diameter side of each funnel 16 functions as a sealing face 16a joined to the panel 12, and this sealing face 16a is processed flat. Each neck 22
Is formed by a tube drawing machine in the same manner as a conventional cathode ray tube. The reinforcing member 26 is used by cutting a glass plate having an appropriate thickness. In the present embodiment, the thickness is 15 m
A reinforcing member 26 formed by cutting a m plate glass at intervals of 20 mm is used. And one side of the reinforcing member 26
It constitutes a flat sealing surface 26a.

Using the above components, the vacuum envelope 10 is assembled in the following procedure. First, the end of the cone 14 of each funnel 16 is cut, and a neck 22 is attached to the end.
With a burner. Next, a phosphor is applied to the inner surface of the panel 12, and the panel and the two funnels 16 are placed on a sealing jig (sealing frame base) (not shown) with the sealing surface 12a of the panel 12 facing upward. Installing.

Subsequently, as shown in FIG.
With the a facing upward, both ends of the reinforcing member 26 are fitted into the recesses 36 of the panel 12, respectively, and the reinforcing member is
2, and the sealing surface 26a of the reinforcing member and the sealing surface 12a of the panel are flush with each other. Then, the frit glass 4 is attached to the sealing surfaces 12a and 26a.
After applying and drying, two funnels 16 with the necks 22 welded thereon are placed with their sealing surfaces 16a facing downward, and the panel is positioned by the positioning portion (pad) of the sealing frame. The 12 and the funnel 16 are positioned at predetermined positions.

Then, the panel 12, the funnel 16 and the reinforcing member 26 are heated by passing them through a sealing furnace. Subsequently, the electron gun 2 is placed in each neck 22 of the envelope thus formed.
After sealing 4, the inside of the envelope is evacuated to form the vacuum envelope 10. After that, each funnel 16
The cathode ray tube is completed by mounting the deflection device 28 on the cone portion 14 and adjusting the position.

In the cathode ray tube configured as described above, the joining portion 25 of the vacuum envelope 10 in which two funnels 16 are joined to form a concave portion is a portion where the strength is weakened. According to the present embodiment, the joint 25 is connected to the reinforcing member 26 and reinforced. Therefore, the cathode ray tube according to the present embodiment can maintain the same atmospheric pressure intensity as a normal cathode ray tube, that is, a cathode ray tube having only a single funnel and a single electron gun.

That is, when atmospheric pressure is applied to the entire vacuum envelope 10, if there is no reinforcing member 26, the joint 25 between the funnels 16 is more concavely deformed to exert a tensile stress, and a portion where the shape change is large. Therefore, the stress value is also larger than the other parts. However, as in the present cathode ray tube, by connecting the reinforcing member 26 to the joint 25 and fitting the reinforcing member to the skirt portion 20 of the panel 12, the deformation of the joint 25 can be suppressed to a small extent. result,
The tensile stress generated at the joint can also be kept sufficiently small. Accordingly, it is possible to provide a cathode ray tube that can reduce the depth while maintaining the symmetry of the divided screens formed in the respective divided regions and has sufficient strength against an atmospheric pressure load.

In the above embodiment, the reinforcing member 26 having a prismatic shape is used. However, the present invention is not limited to this, and the vacuum envelope may be formed using a reinforcing member having another shape. For example, according to the cathode ray tube according to the second embodiment of the present invention shown in FIG. 7 and FIG.
Has a rod shape extending along the short axis Y of the
a is formed flat, is located on the same plane as the sealing surface 12a of the panel 12, and a surface 26b opposite to the sealing surface is formed to be curved. This allows
The longitudinal cross-sectional shape of the reinforcing member 26 is substantially arched. The other configuration and the manufacturing method of the cathode ray tube are the same as those of the above-described first embodiment, and the same portions are denoted by the same reference characters and will not be described in detail.

Even in the case where the reinforcing member 26 having such a shape is used, similarly to the first embodiment, the deformation of the concave joint 25 where the funnels 16 are connected to each other is reduced, and the deformation occurs at the joint. The value of the tensile stress can be reduced.
Therefore, it is possible to maintain the same atmospheric pressure intensity as that of a normal cathode ray tube.

In the above-described embodiment, glass is used as the material of the reinforcing member 26. However, the material is not limited to this, and another material such as metal or ceramic may be used.

According to the cathode ray tube according to the third embodiment of the present invention shown in FIG. 9 and FIG.
Long side wall 2 of skirt portion 20 along short axis Y of panel 12
0a and is formed in a ramen structure. The reinforcing member 26 is formed of a nickel-iron alloy having substantially the same thermal expansion coefficient as glass.
The other configuration and the manufacturing method of the cathode ray tube are the same as those of the above-described first embodiment, and the same portions are denoted by the same reference characters and will not be described in detail.

In this embodiment, a bar made of a nickel-iron alloy is formed in advance as a reinforcing member 26 in a rigid frame structure, and both ends in the axial direction of the reinforcing member are formed at the center of each long side wall 20a of the panel 12. The vacuum envelope 10 is formed by fitting into the recess 36 thus formed.

When a material other than glass is used as the material of the reinforcing member 26, it is necessary to use a material whose coefficient of thermal expansion substantially matches the coefficient of thermal expansion of glass. In other words, the vacuum envelope constituting the cathode ray tube passes through the above-mentioned heat process such as the sealing process and the exhaust process several times, but at this time, if the glass and the reinforcing member have different coefficients of thermal expansion, the Strain is generated between the reinforcing member and the reinforcing member, and in the worst case, the glass may be broken. Therefore, the above problem can be avoided by using a nickel-iron alloy having substantially the same thermal expansion coefficient as glass as the material of the reinforcing member 26 as in the present embodiment.

Further, when a metal material is used as the reinforcing member 26, the shape of the reinforcing member can be freely formed as compared with the case where glass is used. In other words, in the case of glass, shapes such as panels and funnels, plates, and bars
Although it can be relatively easily formed by pressing, cutting, or the like, it is difficult to form the reinforcing member into a complicated shape such as a rigid frame structure as in the present embodiment. On the other hand, in the case of a metal material, since cutting, bending, welding, and the like can be performed, a reinforcing member having a shape that cannot be formed by glass can be easily formed.

Furthermore, when a metal material is used as the reinforcing member 26, the atmospheric pressure strength can be higher than that of a glass reinforcing member if the same shape is used. That is, since the elastic coefficient of the metal material is generally two to three times the value of glass, the metal reinforcing member is less likely to bend under the same external force, and the deformation of the vacuum envelope 10 is suppressed to a small extent. be able to. As a result, the generated tensile stress can be reduced, and sufficient strength can be obtained with respect to an atmospheric pressure load.

The shape of the reinforcing member 26 made of a metal material is not limited to the rigid frame structure, but may be a more complicated shape or
The shape can be made simpler. For example, the shape may be the same as the shape of the reinforcing member in the first and second embodiments. Materials other than glass include metals,
Other materials such as ceramics may be used.

Further, according to the present invention, the shapes of the panel and the funnel are not limited to the above-described embodiments, but may be other shapes. For example, in the above embodiment, the shape in the short axis Y direction of the joint 25 where the two funnels are joined is a straight line.
As in the fourth embodiment shown in FIG.
An arch shape curved in a direction away from 5 may be used. In this case, the sealing surface 26 a of the reinforcing member 26 is also formed in an arch shape corresponding to the joint 25. Other configurations of the cathode ray tube are the same as those of the above-described first embodiment, and the same portions are denoted by the same reference numerals and detailed description thereof will be omitted.

When the sealing surface 26a side of the reinforcing member 26 has an arch shape that is convex in a direction away from the phosphor screen 15 as in the present embodiment, the reinforcing member 26
The force applied from above, that is, the force acting on the vacuum envelope 10 from the funnel 16 side becomes extremely strong, and the amount of deformation of the vacuum envelope with respect to the atmospheric pressure can be suppressed to a very small value.

The recess 36 for fitting the reinforcing member 26 to the panel 12 is not always necessary. For example, after the two funnels 16 and the reinforcing member 26 are joined in advance with frit glass, By sealing the funnel, the panel, the funnel, and the reinforcing member can be sealed to each other without providing the recess 36.

In each of the embodiments described above, the number of funnels is two. However, the present invention is not limited to this, and the present invention can be applied to a cathode ray tube having three or more funnels. .

As shown in FIGS. 12 and 13, according to the cathode ray tube according to the fifth embodiment of the present invention, the vacuum envelope 10 includes three funnels provided side by side in the long axis X direction. A neck 22 is joined to the cone portion 14 of each funnel, and an electron gun is provided in the neck. The central funnel 16 is joined to the funnels 16 on both sides, and the three funnels are joined to the end face of the skirt 20 of the panel 12.

The two joints 25 between the three funnels 16 extend in parallel with the short axis Y, and are respectively located at １ ／ of the length of the panel 12 in the long axis X direction. I have. Reinforcing members 26 are joined to these joints 25, respectively.

According to the above-structured cathode ray tube, the panel 12
The phosphor screen 15 formed on the inner surface is scanned by the electron beams emitted from the three electron guns in three divided areas. In this case, the three divided regions have the same size as each other, and the boundary between the divided regions is located to face the joint 25 and the reinforcing member 26 of the funnel 16. The three necks 22 extend in parallel with each other and are arranged on a normal passing through the center of the corresponding divided region. Other configurations of the cathode ray tube are the same as those of the above-described first embodiment, and the same portions are denoted by the same reference numerals and detailed description thereof will be omitted.

When manufacturing the above cathode ray tube, the panel 12
And each funnel 16 is, like a conventional cathode ray tube,
It is formed by pressing. Each long side wall 2 of the skirt portion 20
0a, the length of the panel 12 in the long axis X direction is 1
At a position separated from each short side wall 20b by a distance of / 3,
Recesses 36 for fitting the ends of the reinforcing members 26 are formed respectively, and open to the sealing surface 12a of the panel.
These recesses 36 are formed simultaneously when the panel 12 is pressed.

Each neck 22 is formed by a drawing machine in the same manner as a conventional cathode ray tube. Also, the two reinforcing members 26
Is used by cutting a glass plate having an appropriate thickness into a rod shape.
For example, a sheet glass having a thickness of 15 mm cut at intervals of 20 mm is used as the reinforcing member 26. Hereinafter, the panel 1 is manufactured by the same manufacturing method as in the first embodiment described above.
2, the vacuum envelope 10 is formed by sealing the funnel 16, and the reinforcing member 26 to form an envelope, and then evacuating the inside to form the vacuum envelope 10. According to the cathode ray tube according to the present embodiment, the funnel 16
Although the two concave joining portions 25 where the two are joined to each other are portions where the strength is particularly weak, since the reinforcing member 26 is connected to each joining portion as in the various embodiments described above. Thus, the same atmospheric pressure intensity as that of a normal cathode ray tube or the cathode ray tube according to another embodiment described above can be maintained.

In each of the various embodiments described above, the reinforcing member 26 is arranged and joined inside the funnel 16, but this reinforcing member is arranged outside the funnel 16 and connected to the joint of the funnel. It may be. As shown in FIGS. 14 and 15, according to the cathode ray tube according to the sixth embodiment of the present invention, the vacuum envelope 10
Are two funnels 1 provided side by side in the long axis X direction.
6 and a neck 22 is provided in the cone portion 14 of each funnel.
And an electron gun is arranged in the neck. The two funnels 16 are joined to each other and are joined to the end face of the skirt portion 20 of the panel 12, that is, the sealing face.

The joint 25 between the funnels 16 is
The panel 12 extends in parallel with the short axis Y, and is located opposite the center of the panel 12 in the long axis X direction. A reinforcing member 26 made of glass is joined to the outer surface of the joint 25 and extends in the short axis Y direction. The rest of the configuration is the same as that of the above-described first embodiment, and the same portions are denoted by the same reference characters and will not be described in detail.

In the above-described cathode ray tube, the panel 12 and the funnel 16 are formed by pressing, similarly to the conventional cathode ray tube. The neck 22 is formed by a tube puller like a conventional cathode ray tube. Further, as the reinforcing member 26, for example, one obtained by cutting a sheet glass having a thickness of 15 mm at intervals of 20 mm is used.

The procedure for assembling the vacuum envelope 10 in the above configuration is as follows. First, similarly to the conventional cathode ray tube, the end of the funnel-shaped cone of each funnel 16 is cut, and the neck 22 is welded to the end by a burner. Next, after a phosphor is applied to the inner surface of the panel 12 and dried, the panel and the two funnels 16 are attached to a sealing jig (not shown) with the sealing surface of the panel 12 facing upward. Frame base).

Subsequently, frit glass is applied to the sealing surface of the panel 12 and dried, and then the neck 22 is placed thereon.
Are placed with their sealing surfaces facing downward, and the panel 12 and the funnel 16 are positioned at predetermined positions by the positioning portion (pad) of the sealing frame. Further, frit glass is applied on the concave joint 25 where the funnels 16 are connected to each other, and after drying, frit glass is placed thereon.

Thereafter, the panel 12, the funnel 16, and the reinforcing member 26 are passed through a sealing furnace to be heated, and the panel 1 is heated.
2. The funnel 16 and the reinforcing member 26 are sealed to each other.
Subsequently, each neck 2 of the envelope thus formed is
After the electron gun is sealed in 2, the inside of the envelope is evacuated to form the vacuum envelope 10. After that, the cathode ray tube is completed by attaching the deflection device 28 to the cone portion 14 of each funnel 16 and adjusting the position.

Also in the cathode ray tube having such a configuration, by providing the reinforcing member 26 at the joint 25 where the funnels 16 are connected to each other, the deformation of the joint can be suppressed to a small extent, and the generated tensile stress can be reduced. It is possible to maintain the same atmospheric pressure intensity as that of a normal cathode ray tube.

In each of the above-described embodiments, the plurality of funnels 16 separately press-molded in advance are provided.
Each of the plurality of funnels, the panel 12, and the reinforcing member is sealed and integrated with each other to form a funnel portion by welding the necks 22 to each other. However, the present invention is not limited to this, and FIGS. As in the seventh embodiment, a plurality of, for example, two neck welded portions, that is, a funnel portion composed of one funnel 16 having two cone portions 14 is press-formed integrally, and the cone of this funnel is formed. The two necks 22 may be welded to the portion to seal the funnel, the panel 12, and the reinforcing member 26.
In this case, the sealing surface 26a of the reinforcing member 26 is formed of a curved surface protruding in a direction away from the phosphor screen 15, and is joined to a portion of the funnel 16 facing the boundary between the two divided regions of the phosphor screen 15. Have been.

The rest of the configuration is the same as that of the cathode ray tube according to the above-described first embodiment, and the same portions are denoted by the same reference characters and will not be described in detail. Also in the seventh embodiment configured as described above, similarly to the above-described various embodiments, the deformation of the central portion of the funnel 16 is suppressed by the reinforcing member 26 to reduce the generated tensile stress. It is possible to maintain the same atmospheric pressure intensity as a normal cathode ray tube.

In each of the embodiments described above, a cathode ray tube without a shadow mask has been described. However, the present invention is not limited to this. For example, a color cathode ray tube having a shadow mask, a cathode ray tube of a beam index type, etc. The present invention can also be applied to a cathode ray tube of the type described above.

Further, in the above-described embodiment, the phosphor screen is divided into a plurality of regions arranged in the longitudinal direction of the panel and scanning is performed. However, the present invention is not limited to this. They may be set side by side in the axial direction.
In this case, the boundary between the divided regions extends along the long axis, and the reinforcing member is provided correspondingly.

[0061]

As described above in detail, according to the present invention, in a cathode ray tube in which a phosphor screen is dividedly scanned by electron beams emitted from a plurality of electron guns, the depth is reduced and the funnel is reduced to a conventional cathode ray tube. Even in the case of a flat shape compared to the pipe, the strength against the atmospheric pressure load is improved by reinforcing the vicinity of the vacuum envelope corresponding to the boundary of the divided region with the reinforcing member, and the vacuum envelope is improved. It is possible to provide a cathode ray tube capable of maintaining the strength of the entire vessel equal to or higher than that of a conventional cathode ray tube.

Further, according to the cathode ray tube of the present invention, it is not necessary to tilt the neck to make the entire funnel convex, so that the symmetry in each area of the divided screen can be maintained, and the raster of each area can be reduced. It becomes easy to continuously and smoothly connect adjacent areas without breaks or overlaps.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a rear side of a cathode ray tube according to a first embodiment of the present invention.

FIG. 2 is a front view showing a panel of the cathode ray tube.

FIG. 3 is a cross-sectional view of the cathode ray tube taken along line AA of FIG.

FIG. 4 is a sectional view of the cathode ray tube taken along line BB of FIG. 1;

FIG. 5 is an exploded perspective view showing components of the cathode ray tube.

FIG. 6 is an exploded perspective view showing a manufacturing process of the cathode ray tube.

FIG. 7 is a cross-sectional view of a cathode ray tube according to a second embodiment of the present invention, taken along a major axis direction.

FIG. 8 is a transverse cross-sectional view of the cathode ray tube according to the second embodiment, taken along the minor axis direction.

FIG. 9 is a cross-sectional view along a major axis direction of a cathode ray tube according to a third embodiment of the present invention.

FIG. 10 is a transverse cross-sectional view of the cathode ray tube according to the third embodiment, taken along the minor axis direction.

FIG. 11 is an exploded perspective view showing a cathode ray tube manufacturing process according to a fourth embodiment of the present invention.

FIG. 12 is a perspective view showing a rear side of a cathode ray tube according to a fifth embodiment of the present invention.

FIG. 13 is an exploded perspective view showing a manufacturing process of the cathode ray tube according to the fifth embodiment.

FIG. 14 is a perspective view showing the rear side of a cathode ray tube according to a sixth embodiment of the present invention.

FIG. 15 is a cross-sectional view along the major axis direction of a cathode ray tube according to the sixth embodiment.

FIG. 16 is an exploded perspective view of a cathode ray tube according to a seventh embodiment of the present invention.

FIG. 17 is a sectional view of the cathode ray tube according to the seventh embodiment, taken along the minor axis direction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Vacuum envelope 12 ... Panel 14 ... Cone part 15 ... Phosphor screen 16 ... Funnel 18 ... Face plate 20 ... Skirt part 20a ... Long side wall 20b ... Short side wall 22 ... Neck 24 ... Electron gun 25 ... Joint part 26 ... Reinforcing member 28 ... Deflection device 36 ... Recess A, B ... Dividing area

Claims (15)

[Claims] 1. A vacuum envelope having a glass panel having a phosphor screen formed on an inner surface thereof, a funnel portion formed of glass having a plurality of necks, and a plurality of deflection members provided on the funnel portion. A plurality of electron guns respectively arranged in the neck and scanning the phosphor screen by dividing the phosphor screen into a plurality of regions by an electron beam; and a boundary between the plurality of regions in the vacuum envelope. A cathode ray tube, comprising: a reinforcing member whose corresponding vicinity is reinforced. 2. The cathode ray tube according to claim 1, wherein the reinforcing member faces the boundary of the region and is joined to the funnel. 3. The cathode ray tube according to claim 1, wherein the reinforcing member faces a boundary of the region and is joined to the glass panel. 4. The funnel portion includes a plurality of funnels provided to face the plurality of regions, respectively, and joined to each other by a joint facing a boundary between the regions. 2. The cathode ray tube according to claim 1, wherein the reinforcement member is joined to the plurality of funnels, and the reinforcing member is joined to a junction of the funnels. 3. 5. A method according to claim 1, wherein said plurality of necks extend substantially parallel to each other and are respectively arranged on a normal passing through the center of a corresponding area of said phosphor screen. The cathode ray tube according to claim 1. 6. The panel includes a substantially rectangular face plate on which the phosphor screen is formed, and a skirt erected on the periphery of the face plate and joined to the funnel. The reinforcing member according to any one of claims 1 to 5, wherein each of the reinforcing members includes a pair of end portions fitted to the skirt portion and a sealing surface joined to an inner surface of the funnel portion. The cathode ray tube according to claim 1. 7. The cathode ray tube according to claim 4, wherein said reinforcing member is joined to said joining portion on an outer surface side of said funnel portion. 8. The cathode ray tube according to claim 1, wherein said reinforcing member is formed in a prismatic shape and extends substantially parallel to a boundary of said region. 9. A cathode ray tube according to claim 1, wherein said reinforcing member is formed in an elongated arch shape and extends substantially parallel to a boundary of said region. 10. The cathode ray tube according to claim 1, wherein said reinforcing member is formed in a rod shape having a rigid frame structure and extends substantially parallel to a boundary of said region. 11. The method according to claim 1, wherein said reinforcing member is made of glass or a material having a coefficient of thermal expansion substantially equal to that of glass.
Item 7. A cathode ray tube according to item 1. 12. The cathode ray tube according to claim 1, wherein said reinforcing member is formed of a metal having substantially the same thermal expansion coefficient as glass. 13. The apparatus according to claim 6, wherein said face plate has a major axis and a minor axis orthogonal to each other, and a boundary between said plurality of regions extends parallel to said minor axis. 13. The cathode ray tube according to any one of 12 above. 14. The skirt portion has a pair of long side walls extending in the long axis direction and a pair of short side walls extending in the short axis direction, and the reinforcing members are respectively fitted to the long side walls. 14. The cathode ray tube according to claim 13, wherein the cathode ray tube has a pair of joined ends. 15. The cathode ray according to claim 7, wherein the face plate has a major axis and a minor axis orthogonal to each other, and a boundary between the plurality of regions extends parallel to the minor axis. tube.