JPH01313844A - Envelope and image displaying element - Google Patents

Abstract

PURPOSE:To form an envelope with a thin member, make a wall face a plane shape and lightweight, and obtain an image with no shadow on a luminous face by arranging supporters supporting the envelope against the atmospheric pressure. CONSTITUTION:At least part of the member forming an envelope 11 is made of a superconductor 18, supporters 28 provided with means to form the magnetic field are arranged at positions to face the superconductor 18 inside the envelope 11 while one end of the supporter 28 is set in no contact with the superconductor 18 and the other end is set in contact with the envelope 11 to constitute the envelope. Lines of magnetic force from the magnetic field forming means 29 reach the superconductor 18 of the envelope 11, an eddy current flows in the superconductor 18, the magnetic field generated by the eddy current and the magnetic field generated by the magnetic field forming means 29 generate a repulsive force, one end of the supporter 28 is put in no contact with the envelope 11 and can cope against the atmospheric pressure applied to the envelope 11. A lightweight screen with no black spot can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is constructed using an envelope made of glass, metal, etc., which is used to maintain the interior in a vacuum or near-vacuum state, and the envelope. The present invention relates to an image display element used in a television receiver and a computer display Rff14.

2. Description of the Related Art Cross-sectional views of a conventional envelope are shown in FIGS. 4, 5, and 6 and will be described. To an envelope whose interior is kept in a vacuum or near-vacuum state, a pressure of approximately 1 kg'/Cm is applied from the outside to the inside of the envelope due to atmospheric pressure.The envelope will not be destroyed by this pressure. In order to achieve this, as shown in FIG. 4, a method is adopted in which the shape of the envelope 31 is constructed with a surface having as much curvature as possible.

Also, for applications where a surface with curvature is inconvenient, please refer to No. 5.

As shown in the figure, there is also a method of resisting pressure by increasing the thickness of the glass or metal plate forming the envelope 32.

Furthermore, in addition to the method described above, as shown in FIG.
A support 34 is placed inside the enclosure 33 so as to be in contact with the wall surface of the envelope 33.
There is a way to support the pressure by providing

Conventionally, the above-mentioned method is generally used for the envelope of an image display element such as a flat cathode ray tube.

Problems to be Solved by the Invention When an envelope is constructed using the conventional method, in order to obtain a completely flat wall surface, the thickness of the glass, metal, etc. increases, which increases the weight of the envelope. However, there is a problem in that the image display device using this envelope is also heavy.

In addition, when a support is provided inside the envelope so as to be in contact with the wall of the envelope, in a flat cathode ray tube, a phosphor is coated on the wall of the envelope and the phosphor is bombarded with an electron beam to emit light. However, since the support blocks the trajectory of the electron beam, the phosphor does not emit light and appears as a black dot on the screen.

The present invention provides an envelope that is light in weight and does not cause black spots on the screen when used in an image display device.

Means for Solving the Problem At least a part of the members forming the envelope is made of a superconductor, and a means capable of forming a magnetic field is provided inside the envelope at a position facing the superconductor. An envelope is constructed by arranging one end of the support without contacting the superconductor and arranging the other end of the support in contact with the envelope.

When the magnetic field lines from the means for forming a magnetic field, which is provided without contacting the superconductor of the working envelope, reach the superconducting body of the envelope, an eddy current flows in the superconductor, and this eddy current By generating a repulsive force between the magnetic field generated by the magnetic field and the magnetic field generated by the means for forming the magnetic field, one side of the support can resist the atmospheric pressure applied to the envelope without coming into contact with the envelope. I can do it.

Embodiment An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of the envelope of the present invention.

The envelope is formed into a box shape by bonding a back plate 5 to a box-shaped container 3 made of a material such as glass with a glass frit, and the inside thereof is kept in a vacuum state. A BYCO-based superconductor film 1 is deposited on the inner wall surface of the box-shaped container 3 by a method such as vapor deposition.
Attach. It has been experimentally confirmed that BYCO-based superconductors exhibit superconductivity even at room temperature.

On the other hand, a plurality of supports 4 are attached to the back plate 5 in advance with one end thereof fixed, and the other end of the support member 4 is attached to the back plate 5.
A magnet 2 capable of generating a strong magnetic field is attached. Regarding the polarity of the magnetic poles of the magnet 2, N poles and S poles are arranged alternately so that the polarities of adjacent magnets are opposite to each other.

The magnetic lines of force 6 generated by the magnet 2 move in an arc from the north pole to the south pole. The cross section of the magnet 2 is circular so that the lines of magnetic force draw a larger arc. This makes it easier for the magnetic lines of force 6 to reach the superconductor film 1, and a strong eddy current flows in the superconductor film 1 due to the magnetic lines of force 6. The magnetic field generated by this eddy current is in the opposite direction to the magnetic field generated by the magnet 2.

Therefore, a mutually repulsive force is generated between the magnet 2 and the superconductor film 1, and this force is caused by the support 4 absorbing the atmospheric pressure applied from the outside to the box-shaped container 3 to which the superconductor film 1 is attached. It becomes a supporting force. In other words, it is possible to construct an envelope that can support atmospheric pressure without the support 4 directly dripping into the box-shaped container 3.

Next, an example of a flat cathode ray tube constructed using the above-mentioned envelope will be described with reference to FIGS. 2 and 3. FIG. 2 is a perspective view of the flat cathode ray tube, and FIG. 3 is a sectional view thereof. The flat cathode ray tube 10 is composed of an envelope 11 and an electrode assembly 12.

Outside, the enclosure 11 has a front plate 13, a back plate 14, and a side wall 15.
A phosphor screen 17 is formed on the inner surface of the front plate 13, and a superconductor film 18 is further formed on the phosphor screen 17. The electrode structure 12 is a back electrode 19
, a linear hot cathode 21, electron beam extraction electrodes 22 and 23, electron beam vertical deflection electrodes 24 and 25, a spacer 26, and a support wall 27 that also serves as an electron beam horizontal deflection electrode. , a support body 2 having magnets 29 attached to its tips arranged at predetermined intervals.
8 and a partition plate 30 including 8.

The envelope 11 is connected to a front plate 13 via a rear substrate 20, electron beam extraction electrodes 22 and 23, electron beam vertical deflection electrodes 24 and 25, a spacer 26, and a partition plate 30.
and supports the back plate 14 against atmospheric pressure. However, the partition plate 30 is not in direct contact with the front plate 13, and the support body 28
Atmospheric pressure is supported by the force generated between the magnet 29 attached to the tip of the superconductor film 18 and the superconductor film 18.

In FIG. 3, the linear hot cathode 21 extends in a direction perpendicular to the paper surface. electron beam extraction electrodes 22 and 23,
Electron beam passing holes 22a, 23a124a125a are formed in the electron beam vertical deflection electrodes 24 and 25 at predetermined intervals in the longitudinal direction of the linear hot cathode 21, respectively.

In the flat cathode ray tube 10, an electron beam taken out from a linear hot cathode 21 passes through an electron beam passage hole 12a113a, and is vertically deflected by electron beam vertical deflection electrodes 24 and 25 when passing through an electron beam passage hole 24a125a. Further, the electron beam is horizontally deflected by a partition plate 30 which also serves as a horizontal deflection electrode, and the phosphor screen 17 is bombarded with light to display an image.

Since the horizontally deflected electron beam does not touch the phosphor screen 17 with the support 28, its path is not obstructed, and the phosphor screen located directly opposite the support 28 also emits light, so that it does not affect the image. never occurs. However, since it is predicted that the trajectory of the electron beam will be bent by the magnetic field of the magnet 29, the timing of the landing of the electron beam on the phosphor screen 17 and the timing of modulating the amount of the electron beam are determined by the beam index. It is necessary to match using methods such as

Effects of the Invention According to the present invention, since a support is disposed to support the envelope against atmospheric pressure, the envelope can be formed from a thin member, and the wall surface is flat and lightweight. We can provide equipment.

In addition, since the support that supports the envelope against atmospheric pressure can be placed without being in direct contact with the envelope, an image display element using this envelope can produce images without shadows on the light emitting surface. This is something that can be provided.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an envelope in one embodiment of the present invention, FIG. 2 is a perspective view of a flat cathode ray tube using the same envelope, and FIG.
The figures are cross-sectional views of the flat cathode ray tube, Figures 4, 5, and 6.
The figure is a sectional view showing the structure of a conventional envelope. 1.18...Superconductor film, 2.2911...Magnet, 3.Fist/box-shaped container, 4.28...Support,
5.14... Rear plate, 101111, flat plate cathode ray tube, 12, fist, electrode ° structure, 21...
Linear hot cathode, 13... Front plate, 17... Phosphor screen, 30... Partition plate Attorney's name Patent attorney Toshio Nakao and 1 other person Figure 1 Figure 2 Figure 3 Figure 31 Outside 1 case Figure 5

Claims (2)

[Claims] (1) An envelope whose interior is in a vacuum state or filled with a dilute gas close to vacuum, at least a part of the members forming the envelope being a superconductor; One end of a support provided with means capable of generating a magnetic field is placed at a position inside the container facing the superconductor, without contacting the superconductor, and the other end of the support is placed opposite to the superconductor. An envelope characterized by being arranged so as to be in contact with the envelope. (2) An image display element using the envelope according to claim 1.