JP2001266777A - Cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cathode-ray tube for giving sufficient strength with respect to atmospheric load applied to the cathode-ray tube, while achieving a high resolution and maintaining a shorter depth. SOLUTION: A funnel 14 of a vacuum envelope 10 has two cone portions 16 and necks 22, connected to the cone portions have respective electron guns 24 arranged for scanning an electron beam over a fluorescent screen divided into two scanning regions A, B. The inner face of a portion between the two cone portions out of the inner face of the funnel is provided with a bridge reinforcing member 40 in contact therewith. The reinforcing member is supported at eight ends, in contact with a central portion of a long-side seal face 21a of a panel 12.

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,
In particular, the present invention relates to a cathode ray tube that divides one phosphor screen into a plurality of regions by a plurality of electron guns, scans the plurality of regions, and combines the images drawn in the respective regions to obtain one image.

[0002]

2. Description of the Related Art In recent years, various studies have been made on a high-definition cathode ray tube having a high-definition broadcast or a large screen accompanying the broadcast. Generally, in order to achieve high resolution of a cathode ray tube, the spot diameter of an electron beam on the phosphor screen must be reduced. On the other hand, conventionally, attempts have been made to improve the electrode structure of the electron gun or to increase the diameter and length 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 becomes longer as the tube becomes larger, 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. Also, in this case, wide-angle deflection causes an increase in the magnification difference between the center and the periphery of the screen, so that it is not advisable to increase the resolution.

Therefore, conventionally, a single phosphor layer is divided into a plurality of areas by using a plurality of electron guns and a plurality of deflection yokes, and a large screen is formed by connecting images of the respective areas. Has been proposed, for example, JP-A-7-45215,
Japanese Patent Laying-Open No. 2-51831 discloses a cathode ray tube for connecting two images to obtain a large screen. Further, JP-A-61-256552 and JP-A-61-256551.
Japanese Patent Application Laid-Open Publication No. HEI 9-214969 proposes a cathode ray tube that connects more images to obtain a large screen.

Such a cathode ray tube has a substantially rectangular panel, a funnel connected to the panel and having two cone portions, and two necks connected to each cone portion of the funnel. And a vacuum envelope consisting of: A deflection device is attached to the outside of each cone,
An electron gun is provided in each neck. In the cathode ray tube having the above configuration, the electron beams emitted from the respective electron guns are deflected by the magnetic field generated by the corresponding deflecting device, and the phosphor screen integrally formed on the inner surface of the panel corresponds to the two corresponding phosphor screens. Scanning is performed by dividing the scanning area.

The images drawn on the phosphor screen by the divided scanning are connected by a signal applied to an electron gun or a deflecting device, thereby reproducing one image having no cut or overlap on the front surface of the phosphor screen.

[0007]

However, in a cathode ray 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 as described above, the phosphors are emitted from the electron gun. Since the depth to the screen is reduced by shortening the distance to the screen, the depth of the funnel is inevitably shorter than that of the conventional cathode ray tube.
Therefore, the strength of the vacuum envelope with respect to the atmospheric pressure load is reduced as compared with the conventional cathode ray tube. For example, the part where multiple cones of the funnel are connected is usually
It is formed in a concave shape, and this portion becomes particularly weak. This becomes more pronounced for larger cathode ray tubes.

Further, Japanese Patent Publication No. 54-12035 and Japanese Patent Application Laid-Open No. 7-45215 disclose a cathode ray tube in which a portion where cone portions of a funnel are connected to each other has a substantially flat shape. According to this cathode ray tube, the strength of the connection portion against the atmospheric pressure load can be maintained relatively high, but instead, the strength of the portion where the curvature of the funnel is large, for example, the peripheral portion of the funnel decreases. 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 thickness of the neck is 1-3 mm
Therefore, the portion connected to the neck of each cone cannot be thickened. In addition, increasing the thickness of the portion of each cone portion where the deflection device is mounted must be avoided because the deflection 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 increases, and the power consumption of the entire cathode ray tube increases. On the other hand, it is impossible to increase the thickness of the neck because it becomes impossible to seal the electron gun.

[0010] From the above, there is a limitation in increasing the thickness of the funnel from the portion connected to the neck to the portion where the deflecting device is mounted, and the thickness of the concave portion connecting the cone portions. Yes.

Japanese Patent Application Laid-Open No. 3-263737 discloses a cathode ray tube in which a rib is provided at a curved portion where a face plate and a skirt are connected on the inner surface of a panel in order to increase the strength of the vacuum envelope against atmospheric pressure load. ing. However, when such a rib is provided, although the stress at a place other than the rib is reduced, the stress at a portion connecting the rib and the inner surface of the panel is increased, and the atmospheric pressure resistance of the cathode ray tube is rather reduced. This is the same even when a rib is provided on the funnel side.

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 in which a phosphor screen is dividedly scanned by a plurality of electron guns while achieving high resolution and maintaining a reduced depth. Another object of the present invention is to provide a cathode ray tube capable of obtaining sufficient strength against an atmospheric pressure load applied to the cathode ray tube.

[0013]

In order to achieve the above object, a cathode ray tube according to the present invention is provided with a substantially rectangular face plate having a phosphor screen formed on an inner surface thereof and standing along a peripheral portion of the face plate. And a funnel having a sealing surface and a plurality of cones joined to the sealing surface of the panel, and having a substantially rectangular skirt portion having a sealing surface. And a neck joined to the small diameter portion of each cone portion, a plurality of electron guns disposed in the neck and emitting an electron beam toward the phosphor screen, and provided on an outer surface of the cone portion. A plurality of deflecting devices for deflecting the electron beam and scanning the phosphor screen by dividing the phosphor screen into a plurality of scanning regions; and a deflecting device provided in contact with an inner surface of the funnel. It is characterized by comprising a reinforcing member having a contact end to the sealing surface of the panel.

According to the cathode ray tube of the present invention,
A seal surface of the funnel is formed to have a width smaller than a seal surface of the panel at least at a position of an end of the reinforcing member.

Further, according to the cathode ray tube of the present invention,
The sealing surface of the panel has a pair of long side sealing surfaces and a pair of short side sealing surfaces, and the sealing surface of the funnel has a pair of long sealing surfaces which respectively contact the long side sealing surfaces of the panel. A side sealing surface, and a pair of short side sealing surfaces respectively in contact with the short side sealing surface of the panel, wherein the reinforcing member is provided on an inner surface between two adjacent cone portions of the funnel. It is characterized in that it has a pair of ends that are in contact with each other and abut against the long-side sealing surface of the panel.

According to another cathode ray tube according to the present invention, the sealing surface of the panel has a pair of long-side sealing surfaces and a pair of short-side sealing surfaces. A pair of long-side sealing surfaces in contact with the long-side sealing surface of the panel, and a pair of short-side sealing surfaces in contact with the short-side sealing surface of the panel,
Two reinforcing members are respectively provided in contact with the inner surfaces of the pair of short sides near the funnel, and the reinforcing members contact the ends of the short side sealing surface and the long side sealing surface of the panel. It is characterized in that it has a contact end.

According to the cathode ray tube having such a configuration, since the deformation of the vacuum envelope due to the atmospheric pressure load can be suppressed to a small value, the stress generated in the vacuum envelope can be suppressed and sufficient for the atmospheric pressure load. Strength can be maintained. That is, a reinforcing member is provided in contact with a portion weak to the atmospheric pressure intensity of the funnel, for example, a portion where adjacent cone portions are connected to each other or a portion having a large curvature near the skirt portion, and an end of the reinforcing member is attached to a panel. , The deformation of the funnel due to the atmospheric pressure load can be suppressed, and the stress generated in the funnel can be reduced.

The reinforcing member needs to be arranged outside the region through which the electron beam passes. However, the region through which the electron beam passes is smaller in the region on the funnel side than the sealing surface, and by providing the reinforcing member in this region. The area of the reinforcing member can be increased, and the reinforcing member can be connected to the funnel and the sealing surface over a wide range. Therefore, the power transmitted from the funnel can be dispersed and supported on the entire sealing surface, and the strength of the entire vacuum envelope can be increased.

[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 color cathode ray tube includes a vacuum envelope 10, which comprises a panel 12 made of glass and two cones provided opposite to the panel. A glass funnel 14 having a unit 16 integrally therewith. The panel 12 integrally includes a substantially rectangular face plate 18 having a substantially rectangular phosphor screen 15 formed on an inner surface thereof, and a skirt portion 20 erected on a peripheral portion of the face plate. The panel 12 has a tube axis passing through the center thereof and substantially perpendicular to the panel, and a long axis (horizontal axis) X and a short axis (vertical axis) Y passing through the tube axis and orthogonal to each other.

The phosphor screen 15 has a plurality of stripe-shaped three-color phosphor layers extending in the short-axis Y direction and emitting blue, green, and red, and a black layer provided between these three-color phosphor layers. And stripes. The phosphor screen 15 is integrated in the entire screen area, and is formed continuously without any joint.

The funnel 14 is joined by, for example, frit glass with its end face, that is, the sealing face, abutted against the end face of the skirt portion 20 of the panel 12, that is, the sealing face. A neck 22 made of glass is joined to a small-diameter end of each cone portion 16. An electron gun 24 for emitting an electron beam toward the phosphor screen 15 is arranged in each neck 22. A deflecting device 28 for horizontally and vertically deflecting the electron beam emitted from the electron gun 24 is mounted outside each cone 16.

A substantially rectangular shadow mask 30 is provided in the vacuum envelope 10 and is located opposite to the phosphor screen 15. The shadow mask 30 includes a substantially rectangular mask body 36 in which a large number of electron beam passage holes are formed, and a substantially rectangular mask frame 38 attached to a peripheral portion of the mask body. And
The shadow mask 30 is supported by the panel 12 by engaging a holder 32 fixed to a mask frame 38 with a stud pin 34 protruding from the skirt portion 20 of the panel 12.

As can be seen from FIGS. 2 and 3, in the present embodiment, the phosphor screen 15 is
Has two scanning areas A and B arranged in the long axis X direction with the short axis Y as a boundary C. These scanning areas A and B have substantially the same rectangular shape. The two necks 22 and the electron gun 24 are arranged such that their central axes D coincide with a normal passing substantially through the centers of the corresponding divided areas A and B.

According to the color cathode ray tube having the above-described structure, the electron beams emitted from the two electron gun assemblies 24 are deflected by the magnetic fields generated by the corresponding deflecting devices 28, and are deflected by the phosphor screen through the shadow mask 30. 15-2
The two scanning areas A and B are scanned horizontally and vertically, respectively.
The images drawn on each of the scanning areas A and B of the phosphor screen 15 by the divided scanning are separate from each other, but are connected by controlling signals applied to the electron gun 24 and the deflecting device 28, and are connected to each other. Play one large image with no breaks over the entire surface.

On the other hand, as shown in FIG. 3 to FIG. 5, the sealing surface 21 of the panel 12 has a pair of long side sealing surfaces 21.
a, 21b and a pair of short side sealing surfaces 21c, 21d, and the long side sealing surface is formed wider than the short side sealing surface. Also, the sealing surface 23 of the funnel 14
Has a pair of long side sealing surfaces 23a, 23b and a pair of short side sealing surfaces 23c, 23d.
3c and 23d are the short side sealing surfaces 21c and 2d of the panel 12.
1d, the long side sealing surfaces 23a, 23
b is formed to have a width smaller than the long side sealing surfaces 21a and 21b of the panel.

In the vacuum envelope 10, a reinforcing member 40 for supporting an atmospheric pressure load is disposed in contact with the center of the funnel 14, and faces the boundary C of the phosphor screen 15. The reinforcing member 40 is formed in a bridge shape and has a pair of ends 41a and 41b. A band-shaped recess 42 extending in the short axis Y direction is formed at the center of the inner surface of the funnel 14, and the reinforcing member 40 is arranged and positioned in the recess. Furthermore, both ends 41a, 41 of the reinforcing member 40
b is provided in contact with the center of the long-side sealing surfaces 21a and 21b of the panel 12, respectively.

In the present embodiment, the reinforcing member 40 is not adhered to the vacuum envelope 10 but is merely in contact therewith, so that its material can be selected relatively freely. That is, when the reinforcing member 40 is sealed to the glass panel 12 with frit glass or the like, a thermal stress due to a difference in the coefficient of thermal expansion between the two becomes a problem in the heating step. Due to the freedom of movement, the generation of thermal stress is almost eliminated. Even if the reinforcing member 40 is merely brought into contact with the vacuum envelope 10, if the inside of the vacuum envelope 10 is evacuated after the evacuation, the reinforcing member 40 is moved with respect to the panel 12 and the funnel 14. There is no problem in this regard as it is fixed without any movement.

The reinforcing member 40 may be bonded to the panel 12 or the funnel 14 by sealing it with frit glass. In this case, the material of the reinforcing member 40 may be a material having a thermal expansion coefficient similar to that of glass, for example, a nickel alloy.

According to the cathode ray tube configured as described above, the reinforcing member 40 is provided in contact with the center of the inner surface of the funnel 14 in the vacuum envelope 10, and both ends 41a and 41b of the reinforcing member are connected. By bringing the panel 12 into contact with the long side sealing surfaces 21a and 21b, the atmospheric pressure load acting on the outer surface of the funnel can be supported by the reinforcing member 40 and the long side sealing surface of the panel. Therefore, while achieving high resolution and maintaining a reduction in depth,
Sufficient strength can be maintained for the atmospheric pressure load applied to the cathode ray tube.

As shown in FIG. 3, the electron beams emitted from the electron guns 24 are deflected and applied to the corresponding scanning areas A and B of the phosphor screen 15, so that the positions of the sealing surfaces 21 and 23 are reduced. , And in a region closer to the funnel 14 than these sealing surfaces, the range through which the electron beam passes is smaller than the scanning regions A and B. Therefore, the reinforcing member 40
Can be made sufficiently wide in accordance with the region through which the electron beam does not pass. Furthermore, the end 41 of the reinforcing member 40
a, 41b can be formed wider in the long side direction of the sealing surfaces 21a, 21b.

Therefore, the atmospheric pressure load transmitted from the reinforcing member 40 and the reinforcing members to the long side sealing surfaces 21a and 21b is distributed and applied over a wide range, and a large vacuum stress is not generated in a specific narrow area. Thereby, the deformation of the entire vacuum envelope 10 can be suppressed, and a cathode ray tube having sufficient strength against an atmospheric pressure load can be obtained.

Since the reinforcing member 40 is arranged in accordance with the concave portion 42 on the inner surface of the funnel 14, during the manufacturing process of the vacuum envelope 10, displacement of the reinforcing member is prevented, and the reinforcing member is easily moved to a predetermined position. Can be positioned. As in the present embodiment, the long side sealing surfaces 21a, 21a,
1b is the long side sealing surface 23a, 23b of the funnel 14.
When formed wider, the recess 42 of the funnel 14
May be omitted, and even in this case, both end portions 41a and 41b of the reinforcing member 40 can be disposed in contact with the panel sealing surfaces 21a and 21b, and the same operation and effect as described above can be obtained.

The long side sealing surface 21 of the panel 12
a, 21b and the long side sealing surface 23a of the funnel 14;
23b are formed to have the same width and the funnel 1
By forming the recess 42 on the inner surface of the panel 4, at least the portion of the long side sealing surfaces 23a and 23b communicating with the recess 42 has a width wider than the long side sealing surfaces 21a and 21b of the panel 12. Becomes narrower. Therefore, even in this case, both end portions 41a and 41b of the reinforcing member 40 can be disposed in contact with the panel sealing surfaces 21a and 21b, and the same operation and effect as described above can be obtained.

In the above embodiment, the funnel 14
Although the reinforcing member 40 is provided at the central portion, the present invention is not limited to this, and the reinforcing member may be provided at another position. As shown in FIGS. 6 and 7, according to the cathode ray tube according to the second embodiment, the sealing surface 21 of the panel 12 is formed wider than the sealing surface 23 of the funnel 14 over the entire circumference. Reinforcing members 40a and 40b are provided on the inner surface side of the large curvature portion 44 of the funnel 14 located near the short side of the skirt portion 20 of the panel 12, respectively. Funnel 14 in contact with reinforcing members 40a, 40b
The inner surface has a shallow recess 46 for positioning the reinforcing member.
a and 46b are formed respectively. These recesses 4
6a, 46b, the reinforcing members 40a, 4b
Ob can be prevented from shifting during the manufacturing process, and the reinforcing member can be accurately positioned. The reinforcing members 40 a and 40 b are in contact with the inner surface of the funnel 14, and the ends of the reinforcing members 40 a and 40 b are connected to the short side sealing surfaces 23 c and 23 d and the long side sealing surfaces 21 a and 21 of the panel 12.
b is in contact with the end.

The other structure is the same as that of the above-described first embodiment, and the same parts are denoted by the same reference numerals and detailed description thereof will be omitted. In the second embodiment,
The shape between the two cone portions 16 is formed to be substantially flat or bulging outward, and the strength of this portion is higher than in the first embodiment. In this case, since the entire surface of the funnel 14 facing the face plate 18 of the panel 12 tends to be deformed into the interior by the atmospheric pressure load, a large bending stress acts on the portion 44 of the periphery of the funnel 14 where the curvature is large. Therefore, a large tensile stress acts on the outer surfaces of these portions 44, and the strength is reduced.

Therefore, according to the second embodiment, as described above, the reinforcing members 40a and 40b are provided on the inner surface side of the portion 44 of the funnel 14, so that the deformation of the funnel and the accompanying skirt portion are provided. It becomes possible to suppress bending near 20. In addition, each reinforcing member 40a, 40
Since b is in contact with the sealing surface 21 of the panel 12, the load due to the atmospheric pressure load can be dispersed over a wide area of the sealing surface 21, and the strength near the sealing surface does not decrease. Thereby, the deformation of the entire vacuum envelope 10 can be suppressed, and a cathode ray tube having sufficient strength against an atmospheric pressure load can be obtained.

The present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the present invention. For example, the width of the sealing surface may be such that only the width of the short side sealing surface of the panel is wider than the width of the short side sealing surface of the funnel, or the width of the short side is the width of the sealing surface of the panel. And the long side may be formed such that the width of the sealing surface of the funnel is increased. Further, the shape, the number, and the arrangement position of the reinforcing members are not limited to the above-described embodiment, and various changes can be made.

Further, the scanning area of the phosphor screen is not limited to two, but can be applied to three or more cathode ray tubes. The present invention is also applicable to other types of cathode ray tubes, such as a monochrome cathode ray tube without a shadow mask, a beam index type cathode ray tube, and the like.

[0039]

As described above in detail, according to the present invention, in a cathode ray tube which scans a phosphor screen by dividing the phosphor screen into a plurality of regions, a portion of the cathode ray tube weakened with respect to the atmospheric pressure intensity of the funnel is used. By providing a reinforcing member and supporting the end of the reinforcing member with the sealing surface of the panel, sufficient strength can be obtained with respect to the atmospheric load applied to the cathode ray tube while achieving high resolution and maintaining a reduced depth. It is to provide a cathode ray tube.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a rear side of a cathode ray tube according to an 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 of the cathode ray tube.

FIG. 6 is a sectional view of a cathode ray tube according to a second embodiment of the present invention.

FIG. 7 is an exploded perspective view of the cathode ray tube according to the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Vacuum envelope 12 ... Panel 14 ... Funnel 15 ... Phosphor screen 16 ... Cone part 21, 23 ... Seal surface 21a, 21b, 23a, 23b ... Long side sealing surface 21c, 21d, 23c, 23d ... Short side Side seal surface 22 Neck 24 Electron gun 30 Shadow mask 40, 40a, 40b Reinforcement member 41a, 41b End 42, 46a, 46b Concavity A, B Scanning area

Claims (8)

[Claims] 1. A substantially rectangular face plate having a phosphor screen formed on an inner surface thereof, and a substantially rectangular skirt portion standing upright along a peripheral edge of the face plate and having a sealing surface. A vacuum envelope including a panel, a funnel having a sealing surface joined to the sealing surface of the panel and a plurality of cones, a neck joined to a small diameter portion of each of the cones, and the neck And a plurality of electron guns disposed in the outer surface of the cone portion for emitting an electron beam toward the phosphor screen, and deflecting the electron beam to make the phosphor screen into a plurality of scanning regions. A plurality of deflecting devices for scanning separately; and a reinforcing member provided in contact with the inner surface of the funnel and having an end abutting on a sealing surface of the panel. Cathode-ray tube, characterized in that was. 2. A cathode ray tube according to claim 1, wherein a sealing surface of said funnel is formed to have a width narrower than a sealing surface of said panel at least at a position of an end of said reinforcing member. . 3. The sealing surface of the panel has a pair of long side sealing surfaces and a pair of short side sealing surfaces, and the sealing surfaces of the funnel correspond to the long side sealing surfaces of the panel, respectively. A pair of long-side sealing surfaces in contact with each other, and a pair of short-side sealing surfaces in contact with the short-side sealing surfaces of the panel, wherein the reinforcing member comprises two adjacent cones of the funnel. 2. The cathode ray tube according to claim 1, wherein the cathode ray tube has a pair of ends that are in contact with the inner surface between the portions and abut against the long-side sealing surface of the panel. 4. The cathode ray tube device according to claim 3, wherein each of the pair of long side sealing surfaces of the funnel is formed to have a width smaller than that of the long side sealing surface of the panel. 5. The funnel has a band-shaped recess formed on an inner surface between two adjacent cone portions and extending between the pair of long side sealing surfaces, and the reinforcing member is provided in the recess. The cathode ray tube according to claim 3, wherein the cathode ray tube is provided. 6. The sealing surface of the panel has a pair of long side sealing surfaces and a pair of short side sealing surfaces, and the sealing surfaces of the funnel correspond to the long side sealing surfaces of the panel, respectively. A pair of long side seal surfaces in contact with each other, and a pair of short side seal surfaces in contact with the short side seal surfaces of the panel, respectively, wherein the inner surfaces of the funnels are in contact with a portion near the pair of short sides. The two reinforcing members are provided respectively, and each reinforcing member has an end portion in contact with the short side sealing surface and the long side sealing surface of the panel. 2. The cathode ray tube according to 1. 7. A long-side sealing surface and a short-side sealing surface of the funnel are formed to have a width narrower than a long-side sealing surface and a short-side sealing surface of the panel, respectively. The cathode ray tube device according to claim 6. 8. The funnel is formed on inner surfaces near the pair of short sides and has a pair of recesses extending to ends of the pair of short side seal surfaces and the long side seal surface. The cathode ray tube according to claim 6, wherein the two reinforcing members are provided in the recesses, respectively.