JPS6035164Y2 - display tube envelope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the structure of a display tube envelope whose periphery is hermetically sealed.

Traditionally, display tubes have been used for display purposes, such as phosphor display tubes in which a phosphor layer coated on an anode is excited by thermionic electrons emitted from a filament-shaped cathode, and used for display purposes, or an anode.・Cold cathode display discharge tubes are known that use glow discharge between cathodes to display images.

These display tubes have one or more pattern display sections in the form of segments or matrices arranged in an envelope kept in a high vacuum atmosphere, and these pattern display sections emit fluorescent light and emit light. The light emitted by the discharge is observed through a window surface of an envelope made of a transparent material such as glass.

On the other hand, in response to the miniaturization of various electronic devices, this type of display tube is also required to be smaller and thinner. Many so-called flat display tubes have been put into practical use.

In many of these flat display tubes, the substrate on which the pattern display section is disposed is a part of the envelope (lower enclosure section), and the upper surface of this substrate is provided with an upper plate section having at least a transparent window section. It has a structure in which the lead-out terminal of each electrode is hermetically penetrated and the peripheral edge is sealed.

In this case, in order to secure a space for accommodating a pattern display section, each electrode, etc., a space for electrons to travel, a discharge space, etc. in the envelope, conventionally, the top plate section has a cross-sectional shape of, for example, a first A container-shaped container is often used, as shown in FIGS.

The example shown in FIG. 1a is an example in which a box-shaped container part 1 is formed by heat-forming the peripheral part of a plate glass, and this container part 1 is divided into a pattern display part, various electrodes, etc. ) is placed on the substrate 2 on which the lead-out terminals 4 are arranged, and the sealing agent 3 is applied to the peripheral edge where the lead-out terminals 4 are sandwiched and contacted, and then heated and melted to allow the lead-out terminals 4 to penetrate airtightly. In this state, the container portion 1 and the substrate 2 are sealed to form an envelope.

In this case, since the sealing agent 3 is applied only to the outer peripheral wall surface of the container part 1 side, there is a problem in that it is difficult to obtain sufficient adhesive strength and airtightness at the sealing part between the container part 1 and the substrate 2. There was a point.

That is, with this structure, the sealing agent 3 tends to sag, resulting in uneven application and fusion conditions, and even after sealing, there is a risk of leakage due to lack of familiarity and peeling. Ta.

Furthermore, in the process of manufacturing such a container-shaped display tube, or when incorporating this display tube into electronic equipment, etc., it is necessary to use a holder 5 as shown by the dashed line in the figure to hold or incorporate the display tube, for example. Therefore, installation as large as the thickness of holder 5 requires a height, and
Since the holder 5 is also large in size, there is a problem in that there are various inconveniences in its handling.

On the other hand, FIG. 1 shows an example in which the container part 6 is formed into a flat boat shape with a flange-like peripheral edge, and in this case, the container part 6 is bent outward and expanded at the opening of the container part 6. A flange-shaped sealing part 6a is formed, and this sealing part 6
Since the sealant 3 is applied and sandwiched between the substrate 2 and the substrate 2 for sealing, the problem of the container shape shown in FIG. 1a is solved.

However, in this case, the sealing agent 3 flows into the airtight space 7 side, which is in a vacuum atmosphere, and becomes exposed, which may adversely affect the display.

That is, since the container part 6 and the substrate 2 are generally formed from a glass material, the sealant 3 is usually a mixture of low melting point glass frit and a binder. If it flows into the airtight space 7 side, the gas released from the binder and the low melting point glass frit during heating will act on the electrodes etc. disposed in the airtight space 7, deteriorating the functions such as display. There was a problem.

The present invention was developed in view of the above-mentioned circumstances, and is formed from a lower enclosure and an upper plate that are hermetically sealed at the periphery, and accommodates a display section, electrodes, etc. In the display tube envelope, the sealing portions on at least one pair of opposing sides of the peripheral portion include a flat plate surface portion of the peripheral edge of the lower surrounding portion and an end surface of the peripheral edge of the upper plate portion that comes into contact with the flat plate portion. and near this end face part,
It is an object of the present invention to provide an envelope for a display tube characterized in that it has a structure in which an outwardly protruding flange part is provided between which a sealing agent is sandwiched between the opposing flat plate surface parts. It is.

In addition, the present invention provides the above-mentioned display tube envelope, in which the upper surface portion includes a channel (n-shaped) upper surface plate integrally formed with an upper window surface portion and a pair of facing side wall portions; The side wall pieces forming the facing side wall portions are joined,
The present invention provides an envelope for a display tube characterized in that a pair of opposing side wall portions of the upper surface plate have an end surface portion provided with the flange-like portion.

Hereinafter, the structure of the display tube envelope of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a cutaway end view of essential parts showing one embodiment of the structure of the display tube envelope according to the present invention, and FIG. 3 is a top plate portion configuring the envelope shown in FIG. FIG. 3 is a cutaway perspective view of a main part showing details.

Here, 11 is a box-shaped upper plate part obtained by heating and forming plate glass, for example, and has an opening 14 at the bottom, and an end face part 12 and an end face part 12 on the periphery of this opening 14. A flange-shaped portion 13 having a width W and protruding outward is formed at a distance from the portion 12.

In this case, the dimensions of the distance and width W are
It is set appropriately depending on the size of the sealant and the viscosity of the sealant when it is applied and heated and melted. In cases where there is little risk of injury,
The values of the distance and width W can also be made large.

Next, 15 is a lower enclosing part, on the upper surface of which a pattern display part, electrodes, etc. (not shown) are arranged at predetermined positions, and the upper surface of the periphery of this lower enclosing part 15 is a flat plate surface part. 1
6 is provided.

On this lower surrounding portion 15, the upper surface plate portion 11 is placed on the flat plate surface portion 16.
and end surface portion 12 are placed so as to be in contact with each other at a predetermined position.

Therefore, in the cavity 23 formed by the flat plate surface portion 16, the flange-like portion 13 near the end surface portion 12, and the side wall 17 of the end surface portion 12, for example, a glass frit obtained by mixing a binder with a low melting point glass frit is filled. The lower enclosure part 1 is filled with a sealing agent 18, and then heated as a whole to melt the sealant.
5 and the upper surface plate portion 11, and this flat plate surface portion 16 and the end surface portion 12.
The space 23 between the side wall 17 and the brim portion 13 is hermetically sealed to form an envelope 19.

Further, in this case, the lead-out terminals 20 from each electrode etc. arranged on the flat plate surface part 16 of the lower surrounding part 15 are hermetically penetrated and sealed in advance.

In this way, the envelope 19 of the present invention is formed by sealing the upper plate part 11 and the lower enclosing part 15 having the above-described configuration, that is, by sealing the flange-shaped part 13 and the lower enclosing part 15. Since the sealing is performed by filling the sealing agent 18 into the gap 23 formed by the flat plate surface portion 16 and the side wall 17 of the surrounding portion 15, the work of applying the sealing agent 18 is extremely easy. It is simplified, and there is very little flow of the sealant 18 during application and heating and baking, and the area covered by the sealant 18 is expanded, so there is no risk of leakage. This provides extremely reliable, airtight, and highly reliable sealing.

Furthermore, since the end surface portion 12 of the upper surface plate portion 11 is sealed in a state where it is in contact with the flat plate surface portion 16 of the lower enclosure portion 15, the sealing agent 18 is applied to the upper surface plate portion 11 and the lower surface portion 16. Enclosure 1
There is almost no possibility that the sealant 18 will flow into the inside of the airtight space 21 formed by the sealant 18, and therefore, during sealing, a display tube of excellent quality is formed without deteriorating the function of the internal electrode parts due to the sealant 18. This will give you the effect of being able to do it.

Further, since the lead-out terminal 20 is reliably covered with a sufficient area by the sealing agent 18, it is securely fixed on the lower enclosure 15, and furthermore, the lead-out terminal 20 is securely covered with the sealing agent 18. When mounting on the surrounding part 15, the end surface part 12 and the flange part 13 also act as restraints that restrict the upward movement of the lead-out terminal 20, both directly and through the adhesive 18, so that mounting work and sealing are easy. This also has the effect of making it easier to put on clothes.

Furthermore, when the display tube having the above-mentioned envelope structure is incorporated into various electronic devices, the holder 22 is locked to the flange-shaped portion 13 as shown by the dashed line in FIG. This makes the installation work extremely easy, and since the installation does not increase the height, it greatly contributes to making electronic devices smaller and thinner.

Here, in the embodiment described above, the flange-like portion 13
is formed over the entire circumference of the upper surface plate portion 11, but the envelope according to the present invention is not limited to this.

That is, FIG. 4 shows a cutaway perspective view of the main part of the top plate portion 11a which is another embodiment of the display tube envelope according to the present invention, and this will be explained.

The top plate portion 11a includes a top window surface portion 30 and a pair of facing side wall portions 31, which are integrally molded using plate glass or the like to form a channel (mouth shape), and a channel-shaped top plate 32. 32 facing opening side wall portions 3
3 and a side wall piece 34 made of a thin strip, for example, which is joined to the top plate part 11 to form a lid.
At the edges of a pair of facing side wall portions 31 of the top plate 32 of a,
It has a structure in which a flange-like part 13a is provided in the end face part 12a and its vicinity, and this is sealed with the lower enveloping part 15 as shown in FIG. 2 to form the outer envelope of the display tube. It is something that becomes.

In the upper plate portion 11a of the embodiment described above, the upper plate 32
can be formed very easily by bending and forming the glass plate into a channel shape and simultaneously forming the brim portion 13a, so that excellent effects in terms of mass production, man-hours, economy, etc. can be obtained.

Moreover, one opposing opening side wall portion 33 of the upper surface plate portion 11a
Since the side wall piece 34 is formed of a thin strip, it is possible to reduce the size of this part.

Therefore, in this upper plate part 11a, when sealing with the lower surrounding part, the flange-like part 1 is attached to the part of the lower surrounding part from which the lead-out terminal is led out.
3a is sealed, and the side wall piece 34 is sealed to the part where the lead-out terminal is not led out, thereby achieving high quality and miniaturization without fear of leakage. Therefore, an extremely effective display tube envelope can be provided.

Further, in the embodiment described above, the upper surface plate portion 11 and ll
Although the example in which a is the front part of the display tube is shown, the present invention also includes a front part formed of plate glass, and a pattern display part etc. Of course, the present invention can also be applied to a display tube in which a mounted substrate is installed.

As described above, the display tube envelope according to the present invention achieves sealing by forming a flange-like portion near the end face portion to be sealed on the periphery of the upper plate portion that is sealed with the lower envelope portion. As a result, the work of applying sealant, mounting the lead-out terminals, sealing work, and securing the electronic equipment to the mounting board are extremely easy and simplified, and the workability is improved. Excellent economical effects such as improvement and reduction of manufacturing costs can be obtained.

In addition, reliability against leaks due to an increase in the sealing area can be improved, and quality can be expected to be improved by preventing the negative effects of the sealant on internal electrodes, etc., resulting in high quality and high quality. This provides an excellent effect in that a display tube with high performance can be formed.

Furthermore, if the display tube is constructed using the envelope according to the present invention, the space required for installation can be reduced, and an excellent effect can be obtained in that it can contribute to downsizing of electronic devices and the like.

[Brief explanation of the drawing]

FIGS. 1a and 1b are cutaway end views of essential parts showing an example of a conventional display tube envelope, and FIGS. 2 and 3 show an embodiment of the display tube envelope according to the present invention. FIG. 4 is a cutaway end view of the main part and a cutaway perspective view of the main part of the top plate part, and FIG. 4 is a cutaway perspective view of the main part of the top plate part which is another embodiment of the display tube envelope according to the present invention. 11, lla...Top plate part, 15...
Lower enclosure part, 16... Flat plate surface part, 12, 12a...
...End face part, 13.13a...Brim part,
18...Sealing agent, 19...Envelope.

Claims (3)

[Scope of utility model registration request] (1) In an envelope for a display tube which houses a display section, electrodes, etc., and has a lower enclosure and an upper plate that are hermetically sealed to each other at the periphery, the outer periphery of the upper plate is sealed. A flange-shaped portion projecting outward is formed on at least a portion of the outer circumferential wall surface slightly above the lower end face portion, and the flange-shaped portion protrudes outward from the lower surface of the flange-shaped portion and the sealing peripheral edge of the lower enclosing portion. An envelope for a display tube, characterized in that a sealing agent is filled between the flat plate surface portion and the upper surface. (2) The upper surface plate part has a box shape with an opening facing the lower surrounding part, and the collar-shaped part is provided on the outer peripheral wall surface of the opening. An envelope for the display tube according to item 1. (3) The upper surface plate portion is formed by joining a mouth-shaped upper surface plate that integrally forms an upper window surface portion and a pair of facing side wall portions, and a side wall piece forming the remaining facing side wall portions, The display tube envelope according to claim 1, which is a registered utility model and has a structure in which the flange-like portions are provided on a pair of opposing side wall portions of the upper surface plate.