JPH05266827A - Cathode-ray tube - Google Patents

Abstract

PURPOSE:To provide a cathode-ray tube for wide vision and High Vision having an oblong shape, a flat panel, good appearance, an image easy to view for an observer, and excellent explosion-proof performance. CONSTITUTION:A cathode-ray tube 20 is provided with a rectangular panel 21 having the ratio of about 16:9 between the long side and the short side of the effective screen, the diagonal outer diameter of 700mm or above, and the outer face average radius of curvature in the diagonal axis direction of 2000mm or above, and a resin plate 22 is stuck on the outer face of the panel 21 with an adhesive 23.

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 for wide vision and high vision.

[0002]

2. Description of the Related Art In recent years, attention has been focused on a high-definition cathode ray tube having a large number of scanning lines and an extremely high image sharpness as compared with a wide-vision cathode ray tube or a conventional cathode ray tube which captures an image with a sense of reality. There is. In these wide-vision and high-definition cathode ray tubes, as shown in FIG. 3, in the rectangular panel 11, the ratio of the short side S to the long side L and the diagonal D of the effective screen is approximately 9:16:18. Therefore, the shape is laterally longer than that of a conventional cathode ray tube in which the ratio of the short side S to the long side L and the diagonal D is 3: 4: 5. The outer surface of the panel 11 is a curved surface having an average radius of curvature in the diagonal axis direction of 1800 mm or less. Incidentally, as is well known, the cathode ray tube is always squeezed to the atmospheric pressure because of its vacuum, and there is a risk of causing implosion. The generation of implosion is more likely to occur as the cathode ray tube becomes larger, that is, in the cathode ray tube having a diagonal outer diameter of 700 mm or more. In a cathode ray tube in which the inside is in a vacuum state, implosion causes compressive stress in the visible area of the panel and conversely, tensile stress is applied to the surrounding side parts, and this tensile stress part is the structure. This is due to the fact that it is becoming weaker. Therefore, conventionally, as shown in Japanese Patent Publication No. 46-27618,
In order to prevent the implosion of the cathode ray tube, a metal frame slightly shorter than the side peripheral part of the panel is expanded by heating and fitted into the side peripheral part, and when the metal frame is returned to room temperature, the side peripheral part of the panel An explosion-proof structure, which is a so-called shrink-fitting system, is adopted so that a tightening force is applied to the cathode ray tube for high-definition televisions.

[0003]

However, such a conventional high-definition cathode ray tube has the following problems of appearance, visual sense, and explosion proof.

FIG. 4 is a perspective view showing a conventional cathode ray tube 10 for high definition. In the conventional high-definition cathode ray tube 10, the radius of curvature forming the panel 11,
In particular, since the outer surface radius of curvature in the diagonal axis direction is 1800 mm or less, the outer surface of the panel 11 has a large drop between the central portion O and the peripheral portion P in the tube axial direction, and the central portion O has a large mountain shape. It has a prominent appearance. Therefore, a high-definition cathode ray tube 10 having such a panel 11
Not only does not have a good appearance, but the surrounding objects are reflected on the panel 11, or the image becomes difficult to see when the screen is viewed from the side in front of the panel 11 away from the central portion O. Inconvenience occurs. Therefore, if the radius of curvature in the diagonal axis direction is made larger than that in the past and the outer surface of the panel 11 is flattened in order to solve this visual problem, the mechanical strength of the cathode ray tube 10 for HDTV is deteriorated. However, implosion is likely to occur. Generally, the strength of the cathode ray tube against the compression of the atmospheric pressure becomes higher as the outer surface shape of the panel 11 becomes spherical and becomes lower as it becomes flatter surface. Therefore, the flattening of the panel 11 lowers the explosion proof property of the cathode ray tube. Will cause. Conventionally, as described above, an explosion-proof structure in which a metal frame 12 is shrink-fitted to the side peripheral portion of the panel 11 is adopted, but since the cathode ray tube 10 for HDTV has a horizontally long shape, the metal frame 12 cannot be tightened. Since only the corner portions of the side peripheral portion are concentrated and the tightening force does not act on the center of each side of the side peripheral portion, the explosion-proof structure is insufficient in the explosion-proof property. In addition, the flattening of the panel 11 makes it more susceptible to implosion.

Therefore, an object of the present invention is a horizontally long cathode ray tube such as a cathode ray tube for wide vision and high vision, in which the panel is flattened to have a good appearance and the image is easy for a viewer to see. Moreover, it is to provide a cathode ray tube having excellent explosion-proof performance.

[0006]

The present invention has been made in view of the above problems and objects, and the ratio of the long side to the short side of the effective screen is approximately 16: 9 and the diagonal outer diameter is 700 mm. A cathode ray tube having the above rectangular panel, characterized in that a resin plate is adhered to the outer surface of the panel.

Further, according to the present invention, the ratio of the long side to the short side of the effective screen is approximately 16: 9, the diagonal outer diameter is 700 mm or more, and the outer surface radius of curvature in the diagonal axis direction is 2000 m.
A cathode ray tube having a rectangular panel of m or more, characterized in that a resin plate is adhered to the outer surface of the panel.

[0008]

According to the cathode ray tube of the present invention, the ratio of the long side to the short side of the effective screen is approximately 16: 9 and the diagonal outer diameter is 700 mm or more by the resin plate adhered to the outer surface of the panel. It is possible to reliably prevent the implosion of the cathode ray tube having the.

Also, in a cathode ray tube having a flattened panel with a radius of curvature of the outer surface of 2000 mm or more in the diagonal axis direction, the resin plate is adhered to the front surface of the panel so that the cathode ray tube is flattened regardless of the flattening of the panel. The implosion of the pipe can be surely prevented.

In the present invention, the standard for flattening the panel is the outer surface radius of curvature in the diagonal axis direction. The reason is that the distance from the center point of the outer surface of the panel to each end in the minor axis direction, the major axis direction and the diagonal axis direction is the longest in the diagonal axis direction, and the degree of contribution to the flattening of the panel is not equal. This is because the radius of curvature in the angular axis direction is the largest. In this specification, the outer surface radius of curvature is not limited to a single radius of curvature from the center point of the outer surface of the panel to the shaft end, and the radius of curvature gradually changes from the center point to the shaft end. Including the case of compound radius of curvature. In the case of the compound radius of curvature, the value of the approximate average radius of curvature when the compound radius of curvature is approximately expanded in series is taken as the radius of curvature in the present invention.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a cathode ray tube 20 for high-definition television according to the present invention, and FIG. 2 is a sectional view thereof.

The cathode ray tube 20 for high-definition television has a short side of the effective screen of 372.6 mm and a long side of 662.4 mm.
The panel 21 has a diagonal outer diameter of 760.0 mm, and the outer surface of the panel 21 is 25 in the diagonal axis direction.
It consists of an average radius of curvature of 00.0 mm. The outer surface of the panel 21 is previously covered with the panel 2 so as to cover the outer surface of the panel 21.
The resin plate 22 that is bent corresponding to the outer surface curvature of No. 1 is bonded by the adhesive material 23. The thickness of the resin plate 22 is
Although not particularly limited, it is desirable to prevent implosion and have shape retention from the workability of adhesion, and preferably 0.4 to 10 mm, more preferably 0.5 to 5 mm.
Is. The resin plate 22 and the adhesive material 23 are both the panel 21.
It is important to select a material that does not interfere with the image clarity because it is attached and adhered to the image area of the resin plate 22 in this embodiment. Is a transparent one such as ethylene-vinyl acetate copolymer resin.

Before adhering the resin plate 22 to the panel 21, the adhesive 23 is evenly applied to one side surface of the resin plate 22 in advance, and the resin plate 22 is applied to the outer surface of the panel 21 of the cathode ray tube 20 for high-definition television. The application surface of the adhesive material 23 of 22 is brought into contact with and pressed to adhere. In this case, the adhesive material 23 may be applied to the outer surface of the panel 21 in advance, and then the resin plate 22 may be attached.

The cathode ray tube 20 for the high definition is
The average radius of curvature of the outer surface of the panel 21 in the diagonal direction is 2
Since it is 000 mm or more, the outer surface of the panel 21 is flattened, and a good appearance in which the central portion O does not project is exhibited. In addition, the resin plate 22 adhered to the front surface of the panel 21 imparts excellent explosion-proof property to the cathode ray tube 20 for high-definition regardless of the flattening of the outer surface of the panel 21.
Regarding the evaluation of the explosion-proof performance, "IECPub" is based on "5.5 Reinforcing Strength Test" in EIAJ (Japan Electronic Machinery Manufacturers Association) ET-31A "CRT Test Method".
The test was carried out according to "lication65, item 18", and good results were obtained with no implosion at all.

Regarding the resin plate 22 and the adhesive material 23,
The material of the resin plate 22 is not limited to this example, and examples thereof include polycarbonate, acrylonitrile-styrene copolymer, and acrylonitrile-butadiene-.
Styrene copolymer, methacrylic acid-styrene copolymer,
Adhesion of transparent thermoplastic resins such as polyarylate, polysulfone, polyether fulphone, amorphous polyolefin resin, polyethylene terephthalate, polycyclohexane dimethyl terephthalate, polyvinyl chloride, acetate resin and transparent thermosetting resins such as diallyl carbonate As the material 23, for example, polyvinyl acetate,
Thermoplastic adhesive such as vinyl acetate, urethane resin, polystyrene resin, polyamide resin, ethylene-vinyl copolymer resin, polypropylene resin, saturated polyester resin, polyvinyl butyral resin, ethylene-acrylic acid ester copolymer resin, Epoxy resin, unsaturated polyester resin, thermosetting adhesive such as acrylic resin, photo-curing adhesive such as polyester acrylate and polyether acrylate, poly iributylene rubber,
Rubber-based adhesives such as polyisobutyl rubber, styrene-butadiene rubber, styrene-butadiene-styrene rubber, hydrogenated styrene-butadiene-styrene rubber, butadiene-acrylonitrile rubber, and silicone rubber are possible, but are not particularly limited. Thermoplastic adhesives are preferred.

[0017]

As described above, the cathode ray tube of the present invention has a horizontally long shape like the cathode ray tubes for wide vision and high vision, and the outer surface of the panel is flattened, so that it has a good appearance. In addition to being presented, it is easy for the viewer to see the image, and the resin plate adhered to the front surface of the panel has excellent explosion-proof performance that is not affected by the flatness of the panel.

[Brief description of drawings]

FIG. 1 is a perspective view of a cathode ray tube according to the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is an explanatory diagram showing a ratio of valid screens.

FIG. 4 is a perspective view of a conventional cathode ray tube.

[Explanation of symbols]

 20 cathode ray tube 21 panel 22 resin plate 23 adhesive

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Motoki Hiratsuka, 1-9 9 Oe-cho, Minato-ku, Nagoya, Aichi Toray Industries, Inc. Nagoya Plant (72) Hidetoshi Sakai 9-e, Oe-cho, Minato-ku, Aichi No. 1 Toray Co., Ltd. Nagoya Office

Claims (2)

[Claims] 1. The ratio of the long side to the short side of the effective screen is approximately 16
A cathode ray tube having a rectangular panel with a diagonal outer diameter of 700 mm or more in a pair 9, wherein a resin plate is adhered to the outer surface of the panel. 2. The outer surface radius of curvature in the diagonal axis direction of the panel is 2000 mm or more.
The described cathode ray tube.