JPH04206327A - Cathode-ray tube - Google Patents

Abstract

PURPOSE:To enhance the strength and reduction in weight of a cathode-ray tube and allow the larger size of the cathode-ray tube by constituting the cathode-ray tube from a front panel consisting of glass and a rear panel consisting of a metal panel having a support frame in the inner part. CONSTITUTION:A front panel 1, which is used to display an image, consists of a glass plate formed in a flat rectangular form. A rear panel 2 consists of a metal panel, which is formed of a front panel support frame 3 directly supporting the front panel 1 and a bottom plate 4 supporting the front panel support frame 3 from under. The front panel support frame 3 is formed as a rectangular frame body having a dimension sufficient to support the front panel 1, and formed from aluminium for the purpose of a lighter weight of the panel. The bottom plate 4 mounted on the bottom part of the front panel support frame 3 is formed of a flat plate body 8, a bottomed dish-like frame body 9 having side walls, and a support structure 10 received in the frame body 9. Thus, an improvement in strength and reduction in weight of a cathode- ray tube can be realized, allowing a larger size.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cathode ray tube used as a television receiver, a terminal display device, etc.

[Summary of the invention]

The present invention improves the strength and weight of the cathode ray tube by configuring the cathode ray tube with a front panel made of glass and a back panel made of a metal panel with a support structure inside, making it possible to increase the size of the cathode ray tube. This is what we are trying to do.

[Conventional technology]

In a cathode ray tube, a cathode such as an electron gun is placed inside the tube in a vacuum state, and the electrons emitted from this cathode are focused to create an electron beam, and its direction is controlled by the action of an electric or magnetic field. It is used as a cathode ray tube for television, etc.

As one such cathode ray tube, a thin flat cathode ray tube (so-called flat display) has been proposed. This flat cathode ray tube is designed so that the angle of the electron beam on the front panel remains constant.
For example, when used as a cathode ray tube, etc., it has many advantages, such as it is easy to obtain a screen with little distortion, and the depth can be reduced to about 10 cm, so the external shape can be made similar to general furniture. It is currently being developed as a cathode ray tube for large-screen televisions.

By the way, since the above-mentioned flat cathode ray tube is made into a flat shape with low strength, the material and thickness must be carefully selected to prevent cracking or implosion due to atmospheric pressure.
There is a need to ensure strength.

For this reason, conventional flat cathode ray tubes have been made entirely of thick glass to withstand atmospheric pressure. However, cathode ray tubes made of thick glass are extremely heavy and large, making them impractical and difficult to increase in size.

Therefore, in recent years, various attempts have been made to ensure the strength and reduce the weight of flat cathode ray tubes.

For example, a cathode ray tube has been proposed in which a support structure such as a beam or beam is interposed between a pair of relatively thin glass plates. Since such a cathode ray tube does not use a thick glass plate, it is possible to reduce the weight compared to the above-mentioned cathode ray tube.

However, in a cathode ray tube consisting of a support structure and a glass plate, it is difficult to match the characteristics such as the coefficient of thermal expansion between the glass plate and the support structure, so the position of the support structure may shift during operation. There is a risk that distortion may occur in the cathode ray tube.

In addition, a cathode ray tube has been proposed that includes a front panel made of glass and a back panel made of metal. This rear panel is made of a metal whose coefficient of thermal expansion is approximately equal to that of the glass in consideration of bondability with the entire surface made of glass, and is bonded to the entire surface of glass by a frit seal.

Even in such a cathode ray tube, the weight can be reduced compared to a cathode ray tube whose entire tube is made of a glass plate.

However, frit seals have low strength, and there is a high risk of cracking or implosion, for example, when attempting to increase the size of a cathode ray tube. In addition, as a method of bonding the glass panel and the metal panel, a method of heat-pressing a lead wire is also used, but there are still problems in terms of strength and the degree of vacuum inside the cathode ray tube.

[Invention or problem to be solved]

As described above, various attempts have been made to improve the strength and reduce the weight of cathode ray tubes, but the reality is that no fully satisfactory cathode ray tube has been obtained.

SUMMARY OF THE INVENTION The present invention has been proposed in view of these conventional circumstances, and an object of the present invention is to provide a cathode ray tube that is lightweight, has excellent strength, and can be made larger.

[Means to solve the problem]

In order to achieve the above-mentioned object, the cathode ray tube of the present invention is characterized in that it has a front panel made of glass and a back panel made of a metal panel, and a support structure is interposed inside the metal panel. .

[Effect]

A metal panel having a support structure inside is lightweight and has excellent strength. Therefore, by using such a metal panel as the back panel, the strength of the cathode ray tube can be improved, the weight can be reduced, and the size can be increased.

〔Example〕

A specific example to which the present invention is applied will be described.

As shown in FIG. 1, the cathode ray tube of this embodiment includes a front panel 1 and a back panel 2 that supports the front panel 1.

The front panel l above is for displaying images etc.
It consists of a glass plate formed into a rectangular planar shape. As the glass used here, any conventionally known glass used in this type of field can be used, and for example, Pyrex, quartz glass, etc. are suitable.

On the other hand, the back panel 2 is made of a metal panel, and includes a front panel support frame 3 that directly supports the front panel I, and a bottom plate 4 that supports the front panel support frame 3 from below.

The front panel support frame 3 is formed as a rectangular frame large enough to support the front panel 1, and is made of aluminum for the purpose of reducing the weight of the panel.

Note that this front panel support frame 3 is made of aluminum,
It may be made of stainless steel or the like. A step portion 5 formed by scraping off a part of the inner wall 3a is provided at a portion of the front panel support frame 3 where the front panel l is provided. It has come to be supported. The front panel support frame 3 and the front panel 1 are made of indium 6 from which the oxide film has been removed in consideration of reliable sealing, cracking and implosion.
are joined by.

The front panel 1 is joined to the front panel support frame 3 by setting indium 6 on the stepped portion 5 of the front panel support frame 3, placing the front panel 1 thereon, and applying a predetermined pressure without applying heat. (so-called hot press)
This is done by According to this bonding using indium 6, since indium 6 is soft and can relieve the stress caused by the difference in the thermal expansion coefficients of glass and aluminum, it is necessary to match the thermal expansion coefficients of glass and aluminum as in the conventional method. This is not necessary, and at the same time provides strong joint strength and a reliable seal, no cracking or implosion will occur. Furthermore, there is a wide range of materials to choose from for the front panel support frame 3. Therefore, since a reliable sole can be obtained, the high degree of vacuum inside the panel can be maintained, and high image quality can be expected.

The front panel l is securely fixed to the front panel support frame 3 by having its outer peripheral edge supported by a panel holding plate 7 made of stainless steel or the like. That is, the panel holding plate 7 screwed to the front panel support frame 3 or the front panel 1 bonded with indium on the stepped portion 5 of the front panel support frame 3 is attached.
Press down on the outer periphery and edges of this front panel l.
is fixed.

In order to ensure the pressure resistance of the panel, the bottom plate 4 attached to the bottom of the front panel support frame 3 includes a flat plate body 8 and a bottomed tray with side walls, as shown in FIG. 2, for example. It is composed of a shaped frame 9 and a support structure 10 housed within the frame 9.

The plate body 8 is formed into a planar rectangular shape large enough to close the inside of the panel surrounded by the front panel support frame 3 and the front panel 1. It is vacuum brazed to the bottom of the frame 3. The plate body 8 has a flange portion 9 formed to project outwardly along the outer peripheral edge of the side wall of the frame body 9 on the opening side.
It is designed to be vacuum brazed to a.

On the other hand, the support structure IO is constructed in a so-called bulge shape, with a plurality of aluminum plates 11 and 12 having a rectangular planar shape being orthogonal to each other in the vertical and horizontal directions at predetermined intervals. This support structure IO is housed within the frame 9 and is closed by the plate 8.

Since the support structure 10 is provided inside the bottom plate 4 configured in this manner, the bottom plate 4 has extremely high strength against external pressure, etc., and can sufficiently withstand pressure even for cathode ray tubes that require a high degree of vacuum. Furthermore, the plate body 8, frame body 9, and support structure 10 that constitute the bottom plate 4 are all made of aluminum and are therefore lightweight.

In addition to the above example, the structure of the support structure 1O is as follows:
For example, as shown in FIG. 3, a similar effect can be expected if a plurality of aluminum plates are combined to form a hexagon and a plurality of hexahedrons 13 are connected.

Alternatively, the shape may be triangular or square.

In the above example, the bottom plate 4 is attached over the entire bottom of the front panel support frame 3, or at least the inside of the panel surrounded by the front panel support frame 3 and the front panel l, as shown in FIG. The outer periphery of the bottom plate 4 may be vacuum brazed to the inner wall surface 3a of the front panel support frame 3 so as to close it.

In the cathode ray tube constructed as described above, the back panel 2 except for the front panel 1 is made of aluminum, so that weight reduction can be achieved. In addition, since the support structure 10 is interposed on the back panel 2, pressure resistance can be ensured to withstand pressure from the outside. Therefore, even if the cathode ray tube is made larger, it is still sufficiently light and has high reliability in terms of strength. Note that when the cathode ray tube is enlarged, the front panel 1 is made to have a small curvature in order to avoid the front panel 1 from becoming thicker and heavier. In this way, it is expected that the strength will be improved compared to a glass plate without curvature, the thickness can be reduced, and the weight can be reduced.

In the above example, the front panel support frame 3 may be simply made of aluminum, or the front panel support frame 3 may also have a structure in which a support structure is built inside like the bottom plate 4 described above. .

By the way, electrodes are arranged inside the panel of the cathode ray tube configured as described above, but in order to take out the electrodes to the outside, for example, as shown in FIG.
An electrode extraction hole 14 that penetrates into the panel is provided in the side wall of the panel, and a recess 15 is provided in the outer wall of the front panel support frame 3 corresponding to the electrode extraction hole 14 for mounting a terminal that does not penetrate into the panel. Then, to install this terminal, insert the external terminal 6, which has been sealed with a hook, into the recess 15 using indium 17
Join by. By bonding indium 17, a reliable seal can be achieved between the external terminal 16 and the inside of the panel, and the inside of the panel can be made airtight.

On the other hand, if there are many lead-out electrodes, providing the external terminals 16 as described above would increase the number of terminals and increase the surface area, so the lead-out electrodes are formed on the front panel as follows.

For example, as shown in FIGS. 6 and 7, Cr, which will serve as a conductive electrode, is vapor-deposited on a front panel 18 made of glass that is larger in circumference than the back panel, and this Cr film is patterned into a predetermined shape to form a predetermined number of An extraction electrode 19 is formed. Note that these extraction electrodes 19 are connected to the front panel 1.
It is formed perpendicularly to one side edge 18a of 8.

Then, in order to insulate the extraction electrodes 19, a glass made of 8102 or the like is deposited on the extraction electrodes 19 to form an insulating layer 20 at a position corresponding to the joint of the front panel 18 with the rear panel. Form. Note that this insulating layer 20 may be formed by a method such as screen printing.

Further, Cr, A, and u for indium bonding are sequentially deposited on this insulating layer 20 to form a Cr layer 2I and an Au layer 22.

Then, as shown in FIG. 8, the front panel 18 having the lead-out electrode 19 formed in this manner is bonded with indium to the back panel 23 which is built into a support structure integrated with the bottom part. That is, a Cr layer 24 and an Au layer 2 are provided at the connection portion of the back panel 23 to which this front panel 18 is connected.
5 are sequentially laminated, and the front panel 18 is hot-pressed with indium 26 interposed thereon to be integrally joined.

If the lead-out electrode I9 is provided on the front panel 18 as described above, the surface area of the terminal can be reduced, and higher density of the terminal can be expected. Further, since the extraction electrode 19 is flat, connection with an external terminal can be simplified.

Furthermore, since the front panel 18 and the back panel 23 are indium bonded, the sealing at this connection is reliable, and the degree of vacuum inside the panel can be maintained.

〔Effect of the invention〕

In the cathode ray tube according to the present invention, since the back panel is made of a metal panel having an internal support structure, it has excellent pressure resistance and can significantly improve the strength and reduce the weight of the cathode ray tube. This makes it possible to increase the size of cathode ray tubes, making it possible to create cathode ray tubes that are compatible with large-screen televisions, and solving problems such as pressure resistance and weight that come with this increase in size.

Furthermore, since the surface area of the glass occupying the inside of the vacuum container is small, the amount of moisture adsorbed inside the vacuum container can be kept low, and high-temperature heating during evacuation is not necessary.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a cathode ray tube showing an embodiment of the present invention. FIG. 2 is an exploded perspective view showing an example of the structure of the back panel of the cathode ray tube, and FIG. 3 is an exploded perspective view showing another example of the structure of the back panel of the cathode ray tube. FIG. 4 is a schematic cross-sectional view showing another example of a cathode ray tube. FIG. 5 is an enlarged sectional view of a main part showing the extraction electrode. 6 and 7 show the extraction electrode formed on the front panel, FIG. 6 is an enlarged perspective view of the main part of the extraction electrode, FIG. 7 is a cross-sectional view thereof, and FIG. 8 is an enlarged cross-sectional view of main parts with the front panel attached to the back panel. 1.18...Front panel 2.23...Back panel 4...Bottom plate IO...Support structure 16...External terminal 19...Extracting electrode 1st section Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] A cathode ray tube comprising: a front panel made of glass; and a back panel made of a metal panel; and a support structure is interposed inside the metal panel.