Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Reexamination Certificate
2000-01-31
2003-09-23
Ball, Michael W. (Department: 1733)
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
C156S306600, C065S034000, C065S043000
Reexamination Certificate
active
06623593
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an outlet structure of sealed container, and more particularly to an outlet structure of chip tube for exhaust in a sealed container such as a plasma display panel, and a technique for manufacturing the same.
2. Description of the Background Art
FIG. 18
is a cross section showing a principal part of an outlet structure of sealed container in accordance with a first prior art illustrated in
FIG. 3
of microfilmed Utility Model Application No. 61-73604.
FIG. 18
shows a sealed container body
10
A constituted of two glass substrates such as a plasma display panel whose peripheral portions are bonded to retain an airtight condition, a second substrate
1011
A made of glass which is a constituent of the sealed container body
10
A, such as a rear glass substrate opposed to a display surface side in a case of a plasma display panel, an exhaust hole
1012
A, a concave portion
1013
A provided in an outer surface side of the second substrate
1011
A, a chip tube
20
A as a hollow member for exhaust to be connected to a not-shown vacuum pump and the like when the sealed container body
10
A is exhausted and a glass paste
30
A obtained by mixing powder of low melting point glass (frit glass) as a thermofusible material into a binder and the like. In the following discussion, the low melting point glass refers to a glass material having a melting point lower than that of normal glass, e.g., of about 400° C., more broadly to a glass material which is melted in a temperature lower than the above sealed container body
10
A and the chip tube
20
A are melted.
A prior-art process for bonding the chip tube
20
A for exhaust to the sealed container body
10
A goes as follows. As shown in
FIG. 18
, the chip tube
20
A is inserted in the exhaust hole
1012
A having the concave portion
1013
A provided in the second substrate
1011
A of the sealed container body
10
A, to be stood. After applying the glass paste
30
A by hand-painting and the like, the chip tube
20
A is put in a furnace, being stood, together with the sealed container body
10
A, to be heated. The glass paste
30
A is melted, to thereby bond (seal) the second substrate
1011
A and the chip tube
20
A.
FIG. 19
is a vertical cross section showing an outlet structure of sealed container in accordance with a second prior art illustrated in
FIG. 4
of microfilmed Utility Model Application No. 61-73604. In the structure of
FIG. 19
, the chip tube
20
B consisting of a tubular portion
2021
and a flare portion
2022
covers an exhaust hole
1012
B provided in a lower plate
1011
B of a sealed container
10
B. A process for bonding the chip tube
20
B and the lower plate
1011
B of the sealed container
10
B goes as follows. Specifically, a sealing member
30
B in paste form such as frit glass is applied to the periphery of an outer rim of the flare portion
2022
, a portion of an outer surface thereof and a portion of an inner surface thereof by hand, and the whole device is thereafter heated to seal the lower plate
1011
B and the chip tube
20
B.
When the prior-art method, i.e., hand-painting of glass paste, is used, the thickness of applied glass paste is likely to be uneven and it is difficult to apply the glass paste steadily to the same position, it sometimes happens that the glass paste is applied to unnecessary portions. If the glass paste is applied to an unnecessary portion, melted low melting point glass flows in the sealed container body through the exhaust hole to contaminate the inside of the sealed container body. Further, if bubbles are mixed in the applied glass paste, the physical strength is deteriorated and at worst a leak occurs to break the airtight condition.
SUMMARY OF THE INVENTION
The present invention is directed to an outlet structure of sealed container. According to a first aspect of the present invention, the outlet structure of sealed container comprises: a hollow member having a tubular portion and a flare-shaped opening portion contiguous to the tubular portion with its diameter expanded towards one end portion of the hollow member, the one end portion being in contact with a major surface of a sealed container body on the periphery of a hole provided in the sealed container body, the opening portion and the tubular portion covering the hole, the hole and the tubular portion having center axes which substantially coincide with each other; and a sealing member adhered contiguously from the outside of an outer rim of the flare-shaped opening portion at the one end portion of the hollow member in the major surface to a portion of the tubular portion beyond the boundary of the flare-shaped opening portion and the tubular portion over the major surface between the outer rim and the outside of the outer rim and a surface of the opening portion.
According to a second aspect of the present invention, in the outlet structure of sealed container of the first aspect, low melting point glass is used as a base material of the sealing member.
According to a third aspect of the present invention, in the outlet structure of sealed container of the second aspect, the sealing member is formed by melting the low melting point glass after disposing the low melting point glass on the periphery of the hollow member.
According to a fourth aspect of the present invention, in the outlet structure of sealed container of the third aspect, the low melting point glass is formed in a tubular shape.
According to a fifth aspect of the present invention, in the outlet structure of sealed container of the fourth aspect, the inside of one end portion of the low melting point glass is out of contact with the flare-shaped opening portion and abuts the major surface of the sealed container body.
According to a sixth aspect of the present invention, in the outlet structure of sealed container of the fourth aspect, the inside of one end portion of the low melting point glass has a concave portion with a diameter substantially equal to a diameter of the outer rim of the flare-shaped opening portion.
According to a seventh aspect of the present invention, in the outlet structure of sealed container of the fourth aspect, the low melting point glass has an outer diameter which is one point two to one point four times as large as a diameter of the outer rim of the flare-shaped opening portion.
According to an eighth aspect of the present invention, in the outlet structure of sealed container of the first aspect, the sealed container body is provided with a holding portion which holds at least a portion of the outer rim of the flare opening portion.
According to a ninth aspect of the present invention, in the outlet structure of sealed container of the first aspect, the sealed container body corresponds to a plasma display panel body.
According to a tenth aspect of the present invention, in the outlet structure of sealed container of the first aspect, the sealed container body corresponds to a display unit body for displaying an image.
According to an eleventh aspect of the present invention, the outlet structure of sealed container comprises: (a) a hollow member having a tubular portion and a flare-shaped opening portion contiguous to the tubular portion with its diameter expanded towards one end portion of the hollow member, the one end portion being located above a major surface of a sealed container body on the periphery of a hole provided in the sealed container body, the opening portion and the tubular portion covering the hole, the hole and the tubular portion having center axes which substantially coincide with each other; and (b) a sealing member adhered on the one end portion of the hollow member to fill between the one end portion and the major surface.
According to a twelfth aspect of the present invention, in the outlet structure of sealed container of the eleventh aspect, low melting point glass is used as a base material of the sealing member.
According to a thirteenth aspect of the present invention, in the outlet structure of sealed c
Ball Michael W.
Kilkenny Todd J.
Mitsubishi Denki & Kabushiki Kaisha
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