JP2000243315A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming device which eliminates thermal influence in sealing by a sealing position of the exhaust tube and a shape of the exhaust tube, preventing the entrance of an impurity into a discharge space and obtaining the stability of discharge on a panel display surface as a whole. SOLUTION: In an image forming device having mutually opposed front base board 10 and back base board 20, and partition walls 30 for forming a microscopic discharge cell between these and constituting the discharge cell in an airtight state by joining the periphery of the base boards via frit 40, an exhaust pipe 50 communicated via an exhaust hole 70 formed in the front base board 10 is provided by vertically standing up on the front base board so that the sealing part 60 becomes a bending exhaust passage separate from the exhaust hole 70.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a color plasma display panel, and more particularly, to an image forming apparatus having an improved sealing structure in an exhaust hole.

[0002]

2. Description of the Related Art An important factor for generating a stable discharge in an image forming apparatus such as a color plasma display panel is a degree of cleanness in a discharge space (discharge cell). That is, even if there are slight impurities or defects in the discharge space, there is a problem that the discharge voltage is increased and stable discharge cannot be obtained. A particular problem was around the exhaust pipe. Also on the display surface of the panel, the most unstable discharge is the connection part of the exhaust pipe, that is, the periphery of the connection hole,
This is due to impurity contamination inside and around the exhaust pipe. This is due to the fact that impurities entering at the time of filling the discharge gas and impurities generated at the time of sealing the exhaust pipe easily accumulate in and around the exhaust pipe.

A conventional color plasma display panel has, for example, a structure shown in FIG. 3. When attention is paid to an exhaust pipe portion, an exhaust pipe 52 has a linear structure, and a connection state with the panel is also improved. It is connected in a straight line extending vertically from the exhaust hole 70 of the panel.

However, generally, impurities in the sealed space are
In the case of this conventional structure, when the discharge gas is filled, the gas is scattered in a straight line.
The impurities entering (scattered) from (0) reach the exhaust holes of the panel straightly, enter the panel, and contaminate the periphery of the exhaust holes. As a result, the discharge voltage at the periphery of the exhaust hole in the discharge space increases, and it is difficult to obtain a stable discharge over the entire display surface of the panel.

[0005] To solve such a problem, Japanese Utility Model Laid-Open No. 59-866648 and Japanese Utility Model Laid-open No. Sho 60-6 are similar examples.
Japanese Patent No. 4555 discloses a structure in which an exhaust pipe is bent once in parallel with a substrate surface so that the exhaust pipe is in close contact with the substrate. In the case of these known examples, since the exhaust pipe is brought into close contact with the substrate, the bent portion of the exhaust pipe is located very close to the exhaust hole of the substrate, and in terms of preventing impurities from entering the panel, Sufficient effect cannot be expected. Therefore, as shown in the latter (Japanese Utility Model Laid-Open No. 60-65555),
Further measures are required, such as attaching a small piece of molecular sieve to the inner surface of the substrate.

In these known examples, the exhaust pipe is brought into close contact with the substrate, and the tip of the exhaust pipe is connected to the panel surface in order to avoid thermal effects when sealing the tip (entrance) of the exhaust pipe. It is necessary to project it further outward, and there is a difficulty in miniaturizing the outer shell in the direction along the panel surface.

[0007] As another similar known example, Japanese Utility Model Laid-Open No.
-74841, JP-A-4-17936, JP-A-5
Japanese Unexamined Patent Publication No. 325836 and Japanese Unexamined Patent Publication No. 5-225910 describe examples of measures to prevent contamination by scattered matter at the time of sealing. However, these known examples do not relate to the structure of the exhaust pipe, but to the specific configuration of the exhaust hole, the lid that seals the exhaust hole, or the shield provided near the exhaust hole in the panel.

[0008]

SUMMARY OF THE INVENTION The present invention has been made based on the above circumstances, and in particular, an electric circuit for driving is usually arranged on the back surface of the panel, and the exhaust pipe is sealed. If the part also falls within this thickness range, paying attention to the point that there is no particular problem, the exhaust pipe is sealed in a direction perpendicular to the panel surface, but the sealing position of the exhaust pipe An image forming apparatus that has no thermal influence upon sealing due to the shape of the exhaust pipe, prevents intrusion of impurities into the discharge space, and obtains overall discharge stability on the display surface of the panel. It is intended to provide.

[0009]

Therefore, in the present invention,
It has a front substrate, a rear substrate, and a partition for forming minute discharge cells between them, and the periphery of the substrate is joined via a frit to form the discharge cells in an airtight state. In the image forming apparatus, an exhaust pipe communicating through an exhaust hole formed in the front substrate is vertically erected on the front substrate such that a sealing portion thereof is separated from the exhaust hole and forms a curved exhaust path. , Characterized by being equipped.

[0010] In this case, as an embodiment of the present invention, the exhaust pipe has a sealing portion located at a tip thereof in a direction perpendicular to the surface of the front substrate, and the exhaust path is bypassed. As described above, between the exhaust hole and the sealing portion, it is configured to be bent a plurality of times, and further, the exhaust pipe does not face the exhaust hole on the surface of the front substrate. Position, the sealing portion is provided, as another form, the exhaust pipe, in a direction perpendicular to the surface of the front substrate, the sealing portion is located at the tip, and It is preferable that the sealing portion is provided on the surface of the front substrate at a position not facing the exhaust hole, and has a flare shape at a portion communicating with the exhaust hole.

In such a configuration, the sealing portion of the exhaust pipe is as far away from the panel surface as possible, and there is no fear that the panel side will be adversely affected by heat at the time of sealing. Impurity scattering from the inlet of the exhaust pipe can be prevented from entering the discharge space from the exhaust hole on the panel side, avoiding the generation of high discharge voltage around the exhaust hole, and ensuring stable discharge on the entire display surface of the panel. Can be secured.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to FIGS. FIG. 1 shows a cross section near the exhaust pipe of the color plasma display panel according to the first embodiment of the present invention, and FIG. 2 also shows a cross section of the second embodiment of the present invention. A cross section near the exhaust pipe is shown.

(First Embodiment) First, the configuration of a first embodiment of the present invention will be described with reference to FIG. Here, a plurality of partitions 30 are provided between the front substrate 10 and the rear substrate 20 facing each other, and fine discharge cells are formed between the respective partitions.
A frit 40 is formed around the front substrate 10 and the back substrate 20, and the frit 40
The inside of the discharge space is kept airtight.

An exhaust hole 70 is provided in the front substrate 10, and the front substrate 10 corresponds to the exhaust hole 70.
The base end of the exhaust pipe 50 is connected to the outer surface of
A sealing portion is located at the end of the exhaust pipe 50 and is sealed vertically away from the exhaust pipe 50. In particular, in the present invention, the exhaust pipe 50 communicating with the discharge space through the exhaust hole is provided on the front substrate 10 so that the sealing portion forms a long exhaust path away from the exhaust hole.

In this embodiment, the exhaust pipe 50 has a structure bent three times at a right angle, and the sealing portion 60 of the exhaust pipe 50 is located closer to the center of the panel outer surface than the exhaust hole 70 of the panel. It is located near the exhaust pipe sealing portion 60 and the exhaust hole 7.
It is spaced apart from 0 by a distance a along the surface direction. In this embodiment, the exhaust pipe bent three times at a right angle is used. However, the bent shape may be a wavy bend or a spiral bend.

In order to obtain such a configuration, a manufacturing method having the following procedure is adopted. First, a plurality of partitions 30 are formed on the rear substrate 20, and the front substrate 10 is fitted to the rear substrate 20 with the partitions interposed therebetween. At this time, a space surrounded by the front substrate 10, the rear substrate 20, and the partition 30 is a discharge space (discharge cell). Actually, a discharge electrode and a phosphor are provided in advance on the front substrate and the rear substrate in the discharge space, and when used as an image display device, the discharge between the discharge electrodes causes the phosphor to emit light. Is emitted, and an image is displayed (lit) on the panel, but detailed description thereof is omitted.

Next, a frit 40 is formed around the front substrate 10 and the rear substrate 20, and the peripheral edge of the panel is sealed. Then, the base end of the exhaust pipe 50 bent a plurality of times is connected to the outer surface of the front substrate 10 corresponding to the exhaust hole 70 provided in the front substrate 10, and the connection portion is sealed. At this time,
The exhaust pipe 50 is open at both ends.

Thereafter, in order to fill the discharge gas into the panel, the exhaust gas passes through the exhaust hole 70 and the exhaust pipe 50 of the panel.
The gas (atmosphere) in the panel is once reduced in pressure and exhausted.
After that, a discharge gas is sealed and finally the exhaust pipe 50 is filled.
Is melted and sealed.

In the color plasma display panel manufactured by the above-described configuration and manufacturing method, cleanness in a discharge space (discharge cell) is secured as an important factor for generating a stable discharge. . That is, even if there is a slight impurity or defect in the discharge space, there is a problem that the discharge voltage increases and stable discharge cannot be obtained. Since the exhaust pipe bends around the periphery and forms a long exhaust path, impurities that scatter inward from the tip (inlet) of the exhaust pipe when discharging gas is charged accumulate on the inner wall or bent portion of the exhaust pipe. As a result, the amount decreases exponentially, the intrusion of impurities into the panel is avoided, and the impurities do not reach the exhaust hole, so that there is no impurity contamination in the peripheral portion. As a result, the discharge state on the display surface of the panel is stabilized as a whole. In addition, by configuring the bent portion of the exhaust pipe toward the center of the display surface of the panel, the size of the panel is not increased as a practical problem.

(Second Embodiment) FIG. 2 shows the vicinity of an exhaust pipe of a color plasma display panel according to another embodiment of the present invention. This embodiment is the same as the embodiment of FIG. 1 described above except for the structure of the exhaust pipe 51, so that the description of the basic configuration, the manufacturing method, and the operation is omitted here.

If the characteristic point is described, the exhaust pipe 5
The structure 1 is a so-called flare type. That is, the sealing portion 60 is located at the tip in a direction perpendicular to the surface of the front substrate 10, and the sealing portion 60 is attached to the front substrate 1.
0, and is provided at a position not opposed to the exhaust hole 70 (the exhaust hole 70 of the panel and the sealing portion 60 of the exhaust pipe 51 are
It is displaced by a distance a in the direction along the plane of the front substrate 10), and has a flare shape at a portion communicating with the exhaust hole 70.

In such a configuration, as described above, since impurities generally fly in a straight line, the amount of impurities that have entered (scattered) from the inlet (sealing portion) of the exhaust pipe is reduced by the amount of exhaust gas. Since the vicinity of the pipe sealing portion is large and the geometrical series decreases as the distance increases, the exhaust pipe is flared, and the position of the exhaust hole 70 is determined from the flight direction of impurities from the sealing portion of the exhaust pipe. By shifting the distance a as much as the distance a, the intrusion of impurities into the discharge space side can be prevented, and there is no fear that the discharge voltage around the exhaust hole increases, which is a particular problem. Stabilization can be realized.

[0023]

As described in detail above, the present invention has a front substrate, a rear substrate, and a partition wall for forming minute discharge cells between them, and a frit formed therebetween. In the image forming apparatus in which the periphery of the substrate is joined and the discharge cell is configured in an airtight state, an exhaust pipe communicating through an exhaust hole formed in the front substrate has a sealing portion separated from the exhaust hole, It is installed vertically on the front substrate so as to form a curved exhaust path.

Therefore, there is no thermal effect at the time of sealing,
In addition, intrusion of impurities into the discharge space is prevented, and discharge stability is obtained as a whole on the display surface of the panel.

[Brief description of the drawings]

FIG. 1 is a partial side view of a display panel according to a first embodiment of the present invention.

FIG. 2 is a partial side view of a display panel according to a second embodiment of the present invention.

FIG. 3 is a partial side view of a display panel showing a conventional configuration.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Front board 20 Back board 30 Partition wall 40 Frit 50, 51, 52 Exhaust pipe 60 Sealing part

Claims (4)

[Claims] 1. A semiconductor device comprising: a front substrate, a rear substrate, and a partition wall for forming minute discharge cells between the front substrate and the rear substrate; In the image forming apparatus configured in an airtight state, an exhaust pipe that communicates through an exhaust hole formed in the front substrate is formed on the front substrate such that a sealing portion forms a curved exhaust path away from the exhaust hole. An image forming apparatus, which is provided standing upright. 2. The exhaust pipe according to claim 1, wherein a sealing portion is positioned at a tip of the exhaust pipe in a direction perpendicular to a surface of the front substrate, and the exhaust hole is sealed with the exhaust hole so as to bypass the exhaust path. The image forming apparatus according to claim 1, wherein the image forming apparatus is configured to bend a plurality of times with a part. 3. The exhaust pipe, on a surface of the front substrate,
The image forming apparatus according to claim 2, wherein the sealing portion is provided at a position not facing the exhaust hole. 4. The exhaust pipe, wherein a sealing portion is located at a tip in a direction perpendicular to the surface of the front substrate, and the sealing portion is formed on the surface of the front substrate by the sealing member. The image forming apparatus according to claim 1, wherein the image forming apparatus is provided at a position that does not face the exhaust hole, and has a flare shape at a portion communicating with the exhaust hole.