JPH10223143A - Planar luminous element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply seal a through-hole, automate work, and improve rigidity by blocking the panel exhaust through-hole with a plug-like body which is slightly larger than the inner diameter of the through-hole and made of a raw material having good airtightness by shrinkage fitting. SOLUTION: A tapered plug-like body 9b has an outer shape slightly larger than a tapered through-hole of a glass panel, it is made of the glass having a thermal expansion coefficient slightly smaller than that of the panel, and the contact face with the through-hole is covered with a low-melting point metal or alloy such as Sn, Pb, Sb. The holding spring 12 of a shaft 13 sealed in an exhaust tube 11 picks the upper section of the plug-like body 9b and temporarily matches it with the through hole. The plug-like body 9b is separated from the through hole by a vertical movement of the shaft 13 after the exhaust tube 11 is closely stuck to the panel, the interior of the panel is exhausted, while being heated to a prescribed temperature by a heater coil 15 to seal rare gas, and the plug-like body 9b is again thrust into the through-hole. When the exhaust tube 11 is removed after cooling, the plug-like body 9b is firmly sealed due to the difference in thermal expansion. The periphery of the projection of the plug-like body 9b is preferably padded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a planar light emitting device.

[0002]

2. Description of the Related Art Conventionally, for example, the sealing contact bonding of a PDP is performed by:
The one shown in FIG. 1 is known. In this figure, reference numeral 1a denotes a discharge electrode formation (display electrode) 2a on a glass substrate, a front plate covered with an insulating dielectric and MgO (not shown), and 1b an address electrode 2b formed and The back plate 5 on which the partition walls 4 forming the discharge spaces (cells) 3 are formed is a seal portion for sealing the closed space. Reference numeral 6 denotes an exhaust through-hole that is an object of the present invention, and a PDP is formed by these. The discharge space 6 is filled with a Ne + Xe (0.1%) Penning mixed gas at a gas pressure of about 300 Torr. Stable light is emitted by ultraviolet light generated by the generated plasma. A glass tube 7 used for connection to a vacuum device is welded and connected to the back plate 1b with a low-melting glass 8 or the like.

[0003]

However, in the conventional method of evacuating the inside of the panel and the gas replacement method by connecting the exhaust glass tube, the glass tube 7 having a small diameter (about 6 mm) is set upright on the panel surface, and It is difficult to join with low melting glass 8.

[0004] Further, after the completion of such an operation, the above-mentioned glass tube must be cut and sealed (tip-off) 9 by gas welding or the like as shown in FIG. Can not be eliminated.

Further, the projections between the glasses cause shape interference with other parts when assembling as a display tube after the panel is sealed and evacuated, so that great care must be taken in assembling to prevent contact damage. there were.

An object of the present invention is to easily seal a through-hole,
Another object of the present invention is to provide a panel which can easily automate the operation.

[0007]

The method for sealing a through hole for exhausting a panel according to the present invention is basically a so-called shrink-fitting method using a plug-like body made of an airtight material slightly larger than the inner diameter of the through hole. This can be achieved by closing the through hole.

That is, after assembling the front plate and the rear plate of the panel, the temperature for activating MgO formed on the dielectric surface of the front plate is generally 350 ° C., and then the diameter of the through hole is reduced for cooling. If it is 3 mm, it expands about 8 microns. Here, by setting the thermal expansion coefficient of the plug-like body to be smaller than the linear expansion coefficient of the plane body in which the through-hole is formed, it is possible to increase the strong airtightness.

More specifically, the surface of the above-mentioned plug-like body is 35
A metal seal having a body melting point of 0 ° C. or less, for example, a metal or an alloy such as tin, lead, and antimony, can be sealed by inserting and sealing while twisting the through hole at a high temperature. The plug-like body was provided with a hollow-shaped indentation for the purpose of alleviating the stress distortion generated at the time of sealing, and a projection was provided at the center of the plug to facilitate insertion.

In order to reduce the positioning error and the mating error between the through hole and the plug-like body, each contact surface is provided with a slight gradient to increase the hermetic contact surface.

[0011]

4 and 5 show one embodiment of the present invention and are used to explain the effects of the present invention.

(Embodiment 1) FIG. 4 is a view showing a first embodiment, and FIG. 5 is a partially enlarged sectional view thereof.

A back plate 1b made of soda lime glass (blue plate glass) having a coefficient of thermal expansion (8 × 10 to ⁶ ) has a tapered through hole 6a having an inner diameter of 3 mm, which is an object of the present invention, and an exhaust port as in the prior art. The through-hole connected to the glass tube 7a was disposed on the other side of the diagonal.

The back plate obtained in this manner is heated to about 350 ° C., and has a slightly larger outer shape than the through-hole, and is tapered Pyrex glass (coefficient of thermal expansion: 3.5 × 10 to ⁶ ).
After inserting the plug-like body 9a made of, the mixture was cooled to room temperature.
The plug-shaped body used here was formed into a shape with an edge in consideration of automatic feeding by a parts feeder or the like.

The reason for heating to 350 ° C. is that the MgO film formed on the front panel of the PDP is generally exhausted while being heated and aged.

After plugging, the inside of the panel was evacuated to 2 × 10 to ⁶ torr using the other exhaust pipe, and the degree of vacuum in the panel was observed using a vacuum gauge connected to the exhaust pipe. It was found that a similar effect was obtained.

(Embodiment 2) FIG. 6 is a diagram for explaining another embodiment.

The precision and surface properties of the through-holes are controlled and created, but there is a slight variation, and the yield in mass production is a problem.

For this reason, the plug-like body 9b or the through-hole 6a
A method was adopted in which the side surface was coated with a low-melting metal or alloy 19 melting at around 300 ° C., and a plug was inserted into the through-hole and cooled as it was while heating to a temperature near or above that melting point.

Here, tin (melting point) is applied to the side and edge of the plug.
232 ° C.) to a thickness of 2 μm by sputtering. This method has an advantage that the members can be formed at a low cost because a larger number of the through holes formed in the panel can be coated simultaneously than the metal coating.

The plug-like body 9b thus obtained was sealed in a 350 ° C. atmosphere while applying a load to the through-hole 6a.

After sealing, the inside of the panel was evacuated to 2 × 10 to ⁶ torr using the other exhaust pipe, and the degree of vacuum in the panel was observed using a vacuum gauge connected to the exhaust pipe. It was found that a similar effect was obtained.

Although tin was used here, lead,
And alloys such as tin and lead, for example, Pb10Sn (tin 10% alloy: 30
Other low melting point alloys such as 0 ° C.) can also be used.

Embodiment 3 In Embodiments 1 and 2, a simple embodiment of the present invention has been described.

Here, another embodiment in consideration of productivity will be described with reference to the drawings and the like.

FIG. 7 shows an exhaust pipe 1 which can be connected to a vacuum pump (not shown) created for attaching the plug to the exhaust hole.
1 is shown. The exhaust pipe 11 is made of transparent Pyrex gas so that the inside state can be seen. A shaft 13 having a spring 12 that can hold the plug 9a is arranged inside the exhaust pipe 11, and the exhaust pipe 11 and the shaft 12 are sealed with an O-ring (not shown). The exhaust pipe 11 is provided with an O-ring 14 for tightly sealing the panel. Further, a heater coil 15 is provided partially to control the temperature inside and around the exhaust pipe.

The procedure using this will be described below with reference to the drawings.

FIG. 8 is a cross-sectional view showing the plug-like body 9b used here, 16 is a projection, and 17 is a stolen portion.

As shown in FIG. 9, the spring 1 of the shaft 13
The plug fixed to 2 while being pinched by the protrusion 16 of the plug is temporarily aligned with the through hole. The periphery of the protruding portion 16 is cut away 17 so that the holding spring can be easily grasped and the contraction stress at the time of sealing can be reduced.

Thereafter, as shown in FIG.
After fixing the panel to the panel, pull up the shaft to separate the plug from the through-hole, and in this state, exhaust the inside of the panel with a vacuum pump connected to an exhaust pipe while heating the panel to a predetermined temperature (here, 350 ° C). Xe-Ne gas was sealed in the panel.

After reaching the predetermined gas pressure, the shaft was lowered as shown in FIG. 11, and the plug 9b was pushed into the through hole 6a and fixed.

FIG. 12 shows the last step. In this state, after the entire panel was sufficiently cooled, the exhaust pipe was removed and the through hole of the panel was sealed.

[0033]

According to the present invention, the planar light emitting device according to the present invention can be sealed with a plug having a simple shape, so that it has higher rigidity against external force than the conventional sealing method using a glass tube. Things are possible. Further, the plug can be removed by heating the panel, and the panel can be recycled.

In addition, there is an effect in consideration of the environment such that the amount of use of lead-containing low-melting glass conventionally used for joining a glass exhaust pipe to a panel can be greatly reduced.

Further, since the height of the projection from the panel can be reduced, it can contribute to the reduction in the thickness of the entire panel.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a conventional example of a PDP.

FIG. 2 is a sectional view showing a conventional example of a PDP.

FIG. 3 is a sectional view showing a conventional example of a PDP.

FIG. 4 is a sectional view showing an embodiment of the present invention.

FIG. 5 is a sectional view showing an embodiment of the present invention.

FIG. 6 is a sectional view showing the configuration of another embodiment of the present invention.

FIG. 7 is a sectional view showing the configuration of another embodiment of the present invention.

FIG. 8 is a sectional view showing a configuration of another embodiment of the present invention.

FIG. 9 is a sectional view showing a step of another embodiment of the present invention.

FIG. 10 is a sectional view showing a step of another embodiment of the present invention.

FIG. 11 is a sectional view showing a step of another embodiment of the present invention.

FIG. 12 is a sectional view showing a step of another embodiment of the present invention.

[Explanation of symbols]

 1a: Front plate, 1b: Back plate, 2a: Electrode, 2b: Address electrode, 3: Discharge space, 4: Partition wall, 5: Seal material.

 ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Toshio Sasamoto 4-6-6 Kanda Surugadai, Chiyoda-ku, Tokyo Inside the Home Appliances and Information Media Business Division of Hitachi, Ltd. (72) Inventor Narumi Nakamura Kanda Surugadai, Chiyoda-ku, Tokyo 4-6-Chome Hitachi, Ltd. Home Appliances and Information Media Business Unit

Claims (5)

[Claims] In a vacuum sealing of a planar light emitting element which is discharged in a rare gas atmosphere, a plug-like body having a draft matching with an exhaust through hole formed in a panel surface is inserted into the through hole. A planar light emitting device characterized by being obtained by being inserted and fixedly sealed in a light emitting device. 2. The planar shape according to claim 1, wherein said exhaust hole is sealed with a small-diameter glass stopper having a smaller coefficient of thermal expansion than a coefficient of thermal expansion of glass of said panel when said exhaust hole of said planar light emitting element is sealed. Light emitting element. 3. The small-diameter glass stopper whose surface in contact with the inner wall surface of the panel exhaust hole is covered with a low-melting-point metal or alloy such as tin, lead, or antimony, and the small-diameter glass stopper is sealed with the small-diameter glass stopper. The planar light emitting device according to claim 1. 4. A small-diameter glass stopper, wherein a knob-shaped projection used for arranging a small-diameter glass stopper in a panel exhaust hole is provided on a surface of the panel on an open-air side of the panel, and the small-diameter glass stopper is stolen. The planar light-emitting element according to claim 1, wherein the element is sealed. 5. The planar light-emitting device according to claim 1, wherein the exhaust hole is sealed with a small-diameter glass stopper having a rim with the stopper.