JPH1025124A - Carbon heater for sealing glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a carbon heater for sealing glass, enhanced in the efficiency of heat generation in a work insertion hole-arranged region and reduced in an electric current value required for sealing the glass by changing the thickness and resistivity of the carbon heater in the work insertion hole-arranged region. SOLUTION: This carbon heater for sealing glass is provided with a board- like heater main body (upper heater 10, lower heater 20A), electrodes 11a, 11b, 21a, 21b disposed along a pair of the side parts of the heater main body, and work insertion holes 22 in the heater main body between the electrodes in the thickness direction. The thickness of the heater main body in the work insertion hole-arranged region B having work insertion holes 22 therein is enlarged in comparison with the thickness of the heater main body in the side parts having electrodes 21a, 21b disposed therein. The work insertion hole- arranged region B of the heater main body has a composite layer structure in which three layers comprising a low resistant layer C, a high resistant layer R and a low resistant C are piled up in the thickness direction. The ends of the work insertion holes 22 are placed in the low resistant layer C or at its near places, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carbon heater for glass sealing, and more particularly to a carbon heater for glass sealing which is used when a discharge tube type surge absorber is manufactured or when a diode or the like is glass-sealed. .

[0002]

2. Description of the Related Art When a discharge tube type surge absorber is manufactured or a diode or the like is sealed with glass, glass sealing is generally performed as follows. That is, first, a glass tube and a slag lead or a dumet wire and an object to be sealed are set in a carbon heater, and this is set in an enclosing device,
After evacuation, an inert gas is introduced, the carbon heater is energized to generate heat, and the glass tube is melted to seal the slag lead or Dumet wire and wet the glass tube.

A carbon heater used for such a glass sealing is, for example, shown in FIGS. 4 (a) (perspective view) and (b).
As shown in FIG. 4A, a sectional view taken along line BB of FIG.
A disk-shaped carbon upper heater 10 having electrodes 11a and 11b formed on a pair of side portions, and an electrode 21a,
A lower heater 20 made of a disc-shaped carbon having a plurality of work insertion holes 22 provided in a region between the electrodes 21a and 21b is used. A work such as a glass tube is inserted into 22 and glass sealing is performed. (Hereinafter, a portion A where an electrode of a carbon heater is provided is referred to as an “electrode forming region” and a portion B where a work insertion hole is provided. May be referred to as “work insertion hole arrangement area”.)

Conventionally, this carbon heater has been formed using one type of carbon, and therefore, both the upper heater and the lower heater are all made of carbon having the same resistance value.

[0005]

In the glass sealing, the glass heater for sealing the glass is used by being set in an enclosing device. Has restrictions.

Therefore, in order to seal a glass tube longer than the thickness of the carbon heater in the electrode forming region A, the carbon heaters shown in FIGS. 5 (a) (perspective view) and (b) (FIG. 5 (a)) are used.
As shown in FIG.
The thickness of the workpiece insertion hole forming area B is increased without changing the thickness of the
In the case of the configuration in which is formed, the following problem occurs (in FIGS. 5A and 5B, FIGS. 4A and 4B).
Members having the same functions as the members shown in (b) are denoted by the same reference numerals. ).

That is, since the heaters are all made of the same carbon, the electrode forming region A having a small sectional area is
The resistance value is higher than that of the work insertion hole arrangement area B having a large sectional area. For this reason, the carbon heater mainly generates heat in the electrode formation region A having a high resistance value, and generates little heat in the work insertion hole arrangement region B. Therefore, the carbon heater generates heat in the work insertion hole 22 in the work insertion hole arrangement region B. It cannot perform efficient sealing. When the amount of electricity is increased to increase heat generation in the work insertion hole arrangement area B, the electrodes may be melted due to overheating in the electrode formation area A.

When there is no particular limitation on the thickness of the electrode formation region of the carbon heater, overheating in such an electrode formation region can be prevented by increasing the thickness of the carbon heater as a whole. In the configuration in which the electrodes are formed on the outer surfaces of the upper and lower heaters, current does not flow uniformly in the heaters, so that heat is generated only on the electrode forming surface side of the heaters and is not generated uniformly in the work insertion hole arrangement area; It is necessary to supply an excessive current in order to obtain the heat generated by the power supply, and a power supply having a sufficiently large capacity is required.

The present invention solves the above-mentioned conventional problems, and has a high heat generation efficiency in a work insertion hole arrangement region of a carbon heater and can reduce a current value required for glass sealing. It is an object to provide a heater.

[0010]

According to the first aspect of the present invention, there is provided a glass sealing carbon heater comprising: a disk-shaped heater body; electrodes provided along a pair of side portions of the heater body; In a glass sealing carbon heater having a work insertion hole provided in the thickness direction, the thickness of the heater body in the work insertion hole arrangement region where the work insertion hole is provided is such that the electrode is The thickness of the heater main body at the side portion provided is greater than the thickness of the heater main body. In the work insertion hole arrangement region of the heater main body, the heater main body has a low resistance layer, a high resistance layer, and a low resistance layer in a thickness direction. And the end portions of the work insertion holes are respectively located in or near the low resistance layer.

The glass sealing carbon heater according to a second aspect of the present invention includes a disk-shaped heater main body, electrodes provided along a pair of side edges of the heater main body, and a heater main body between the electrodes.
In a carbon heater for glass sealing provided with a work insertion hole provided in a thickness direction, the heater main body is provided in a work insertion hole arrangement region provided with the work insertion hole, and a space portion extending in a direction crossing the work insertion hole. Is provided, whereby the work insertion hole arrangement area is separated into one half side and the other half side with the space portion interposed therebetween, and the work insertion holes are arranged in a straight line on the half side and the other half side. It is characterized by being provided.

In the glass sealing carbon heater according to the first aspect, the work insertion hole arrangement region has a laminated structure in which three layers of a low resistance layer, a high resistance layer, and a low resistance layer are overlapped in the thickness direction. Even if the thickness of the heater main body in the work insertion hole arrangement area is thicker than the thickness of the heater main body in the electrode formation area on the side where the electrode is provided, the work insertion hole arrangement area is larger than the electrode formation area. It can exhibit a high resistance value. For this reason, the work insertion hole arrangement area efficiently generates heat by energization at the time of sealing. Note that even if a high resistance layer is provided in the work insertion hole arrangement area, the end of the work insertion hole for actually sealing the work is located in or near the low resistance layer, so that heat is mainly generated. Since this occurs at the end of the work insertion hole, the presence of the high resistance layer does not adversely affect the sealing.

In the glass sealing carbon heater according to the present invention, the work insertion hole arrangement area of the heater body is divided into one half and the other half with the space portion interposed therebetween. Since the end of the work is located in the insertion hole, heat is efficiently generated only at the end of the work.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a glass sealing carbon heater according to an embodiment of the present invention.

1 to 3 show an embodiment of a carbon heater for glass sealing according to the present invention, wherein FIG.
FIG. 2B is a cross-sectional view taken along line BB of FIG.

In FIGS. 1 to 3, members having the same functions as those shown in FIGS. 4 and 5 are denoted by the same reference numerals.

In the carbon sealing glass heater shown in FIG. 1, the work insertion hole arrangement region B of the lower heater 20A has carbon C and a material R having a higher resistivity than the carbon (hereinafter referred to as a "high resistance material"). In the use state in which the upper heater 10 made of carbon C is placed on the lower heater 20A, the work insertion hole arrangement area B has three layers of the carbon C layer, the high resistance material R layer, and the carbon C layer. It has a laminated structure that is overlapped in the thickness direction.
2a is located in the carbon C of the lower heater 20A,
The point that 2b is configured to be located near the carbon C of the upper heater 10 is different from the glass sealing carbon heater shown in FIG.

In the carbon sealing glass heater shown in FIG. 2, a work insertion hole 12 is provided in an upper heater 10A instead of the lower heater 20A, and the work insertion hole arrangement region B of the upper heater 10A is made of carbon C and a high resistance material. R, and the lower heater 20 is made of carbon C, which is different from the glass sealing carbon heater shown in FIG.

In the case of the glass sealing carbon heaters shown in FIGS. 1 and 2, the upper heaters 10 and 10A and the lower heater 2 are used.
In the use state in which 0A and 20 are superimposed, the work insertion hole arrangement area B has three layers of a low resistance carbon C layer, a high resistance high resistance material R layer, and a low resistance carbon C layer. It becomes a laminated structure that overlaps in the vertical direction. Therefore, the lower heater 20A or the upper heater 1
Even if the thickness of 0A is larger than the thickness of the electrode formation region A, the work insertion hole arrangement region B can have a higher resistance value than the electrode formation region A. For this reason, it is possible to efficiently generate heat in the work insertion hole arrangement area B by energization at the time of sealing.

Even if a layer of a high resistance material R is provided in the work insertion hole arrangement area B, the end of the work insertion hole 22 or 12 for actually sealing the work is formed of a low resistance carbon material. Since it is located in or near the C layer, heat is mainly generated at the end of the work insertion hole 22 or 12, so that the presence of the layer of the high resistance material R adversely affects the sealing. There is no.

In the glass sealing carbon heater shown in FIGS. 1 and 2, carbon C is a resistivity of 500 to 1500 used as a constituent material of an ordinary carbon heater.
Carbon of about μΩ · cm can be used. The high-resistivity material is not particularly limited as long as it has a higher resistivity than this carbon, and usually, carbon having a resistivity of 1500 μΩ · cm or more, or S
Ceramics such as iC, SiO ₂ , SiN, or insulating alumina, corundum, and mullite can be used.

The thickness of the layer of the high-resistance material R depends on the dimensions of the carbon heater, the length of the work insertion hole, the difference between the resistivity of the high-resistance material and the resistivity of the carbon, the required power supply efficiency, and the like. In a normal case, for example, in FIG. 1, the ratio of the thickness d ₃ of the high-resistance material R portion to the total thickness (d ₁ + d ₂ ) of the carbon C portion is 10 to 10. 9
It is preferable to set it to about 5%.

In particular, when an insulating material is used as the high resistance material R, the thickness d ₂ of the carbon C portion of the work insertion hole arrangement region B and the thickness d ₄ of the electrode formation region A are made equal. It is preferable to set the thickness d ₃ of the layer of the high-resistance material R.

In the glass sealing carbon heater shown in FIG. 3, a space portion 33 is provided in the work insertion hole arrangement area B of the heater body 30 so as to extend in a direction crossing the work insertion holes 32 (32A, 32B). The work insertion hole arrangement area B is separated into one half and the other half with the space 33 interposed therebetween, and the work insertion holes 32A,
32B are provided on a straight line. In addition,
31a, 31b, 31c, 31d are electrodes.

In the glass sealing carbon heater, the work insertion hole arrangement area B of the heater main body 30 is
Is separated into one half and the other half, and the ends of the work are located in the work insertion holes 32A and 32B of the one half and the other half, so that only the end of the work is efficiently used. Can generate heat.

In the glass sealing carbon heater, the thickness of the space 33 is such that the thickness T ₁ of the electrode forming area A of the heater body 30 is equal to the thickness T ₂ of one half of the work insertion hole arrangement area B. It is preferable that the thickness is set so as to be equal to the sum of the thickness T ₃ on the other half side, that is, T ₁ ≧ T ₂ + T ₃ .

In the present invention, the material of the electrode portion and other structures are not particularly limited, and the same structure as that of the related art can be employed.

[0028]

The present invention will be described more specifically below with reference to examples and comparative examples.

Example 1 A glass sealing carbon heater having the structure shown in FIGS. 1A and 1B was manufactured.

The upper heater of this glass sealing carbon heater has a length of 254 mm, a width of 152 mm, and a thickness of 6.3 mm. The lower heater has a length of 254 mm and a width of 152 mm.
The electrode forming area is 30 mm long and 8.7 mm thick, and the work insertion hole arrangement area is 194 mm long and 20 mm thick.
In the work insertion hole arrangement area, the diameter is 5.0 μm and the depth is 1.
There are provided 400 5 mm work insertion holes.

The upper heater has a total resistivity of 1000 μΩ · c.
m of carbon. The lower heater has a resistivity of 1
2,000μΩ ・ cm carbon and resistance 2000μΩ ・ cm
And carbon. This resistance 2000μΩcm
The portion made of carbon has a width of 152 mm, a length of 176.6 mm, and a work insertion hole arrangement area of the lower heater.
This is a portion having a thickness of 11.3 mm.

Copper electrodes were formed on the upper and lower heaters.

A work is inserted into the work insertion hole of the lower heater of the carbon heater for glass sealing, and the upper heater is covered. The upper heater is set in an enclosing device, and gas is replaced.
The work was sealed. The maximum current value required for sealing and the presence or absence of melting of the electrode at the time of sealing were examined. The results are shown in Table 1.

Example 2 A carbon heater for glass sealing was produced in the same manner as in Example 1 except that insulating alumina was used instead of carbon having a resistivity of 2000 μΩ · cm as a high resistance material of the lower heater. Similarly, the maximum current value required for sealing and the presence or absence of melting of the electrode were examined, and the results are shown in Table 1.

Example 3 A glass sealing carbon heater having the structure shown in FIGS. 2A and 2B was manufactured.

The lower heater of the glass sealing carbon heater has a length of 254 mm, a width of 152 mm, and a thickness of 6.3 mm. The upper heater is 254 mm long and 152 mm wide.
The electrode forming area is 30 mm long and 8.7 mm thick, and the work insertion hole arrangement area is 194 mm long and 20 mm thick.
In the work insertion hole arrangement area, the diameter is 5.0 μm and the depth is 1.
There are provided 400 5 mm work insertion holes.

The lower heater has an overall resistivity of 1000 μΩ · c.
m of carbon. The upper heater has a resistivity of 1
2,000μΩ ・ cm carbon and resistance 2000μΩ ・ cm
And carbon. This resistance 2000μΩcm
The portion made of carbon has a width of 152 mm, a length of 176.6 mm, and a work insertion hole arrangement area of the lower heater.
This is a portion having a thickness of 11.3 mm.

Copper electrodes were formed on these upper and lower heaters.

With respect to such a carbon heater for glass sealing, the maximum current value required for sealing and the presence or absence of melting of the electrode were examined in the same manner as in Example 1, and the results are shown in Table 1.

Example 4 A carbon heater for glass sealing was produced in the same manner as in Example 3, except that insulating alumina was used instead of carbon having a resistivity of 2000 μΩ · cm as a high resistance material of the upper heater. Similarly, the maximum current value required for sealing and the presence or absence of melting of the electrode were examined, and the results are shown in Table 1.

Example 5 A carbon sealing glass heater having the structure shown in FIGS. 3A and 3B was manufactured.

The heater body of this glass sealing carbon heater has a length of 254 mm, a width of 152 mm, an electrode forming area of 30 mm in length, a thickness of 15 mm, and a thickness of one half and the other half of a work insertion hole arrangement area. At 7.5 mm, the thickness of the space is 8.5 mm.

A through-hole having a diameter of 5.0 μm is provided on one half of the work insertion hole arrangement area, and 400 holes having a diameter of 5.0 μm and a depth of 6 mm are provided in a straight line on the other half.

The entire heater body has a resistivity of 1000 μΩ.
cm of carbon to form a copper electrode.

For this carbon heater for glass sealing, the maximum current value required for sealing and the presence or absence of melting of the electrodes were examined in the same manner as in Example 1, and the results are shown in Table 1.

Comparative Example 1 A glass sealing carbon heater was produced in the same manner as in Example 1, except that the lower heater was entirely made of carbon having a resistivity of 1000 μΩ · cm without using a high-resistance material. The maximum current value required for sealing and the presence or absence of melting of the electrode were examined. The results are shown in Table 1.

[0047]

[Table 1]

As can be seen from Table 1, according to the carbon heater for glass sealing of the present invention, since the heat generation efficiency in the work insertion hole arrangement area is good, the energizing current at the time of sealing can be reduced. It is clear that the electrodes generate heat mainly in the arrangement region, so that the electrodes can be prevented from melting.

[0049]

As described above in detail, according to the carbon heater for glass sealing of the present invention, the heat generation efficiency in the work insertion hole arrangement region is increased as compared with the conventional product, so that the current value at the time of sealing is reduced. And efficient encapsulation. Further, since the current value required for sealing can be reduced, it is possible to reduce the capacity of the power supply required for the enclosing device. Further, since the carbon heater for glass sealing of the present invention generates heat mainly in the work insertion hole arrangement area, the problem of electrode melting due to overheating of the electrode formation area is solved.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a carbon heater for glass sealing of the present invention, wherein FIG. 1 (a) is a perspective view and FIG. 1 (b) is a cross-sectional view taken along line BB of FIG. 1 (a).

FIGS. 2A and 2B show another embodiment of the glass sealing carbon heater of the present invention, wherein FIG. 2A is a perspective view and FIG.
It is sectional drawing which follows the BB line of the figure.

3A and 3B show another embodiment of the glass sealing carbon heater of the present invention, wherein FIG. 3A is a perspective view and FIG.
It is sectional drawing which follows the BB line of the figure.

4A and 4B show a conventional example, in which FIG. 4A is a perspective view, and FIG. 4B is a cross-sectional view taken along line BB of FIG.

5A and 5B show a conventional example, in which FIG. 5A is a perspective view, and FIG. 5B is a sectional view taken along line BB in FIG.

[Explanation of symbols]

10, 10A Upper heater 20, 20A Lower heater 12, 22, 32 (32A, 32B) Work insertion hole 11a, 11b, 21a, 21b, 31a, 31b, 3
1c, 31d electrode 30 heater body 33 space A electrode formation area B work insertion hole arrangement area C carbon R high resistance material

Claims (2)

[Claims] 1. A disk-shaped heater main body, and one of said heater main bodies.
A glass sealing carbon heater comprising electrodes provided along the pair of side portions and a work insertion hole provided in a thickness direction in a heater body between the electrodes, wherein the work insertion hole is provided. The thickness of the heater body in the work insertion hole arrangement region is larger than the thickness of the heater body in the side portion where the electrode is provided, and the heater body is low in the work insertion hole arrangement region of the heater body. It has a multilayer structure in which three layers of a resistance layer, a high resistance layer and a low resistance layer are overlapped in the thickness direction, and the ends of the work insertion holes are respectively located in or near the low resistance layer. Glass sealing carbon heater. 2. A disk-shaped heater main body, and one of the heater main bodies.
A carbon sealing glass heater comprising: electrodes provided along a pair of side portions; and a work insertion hole provided in a thickness direction in a heater main body between the electrodes. In the work insertion hole arrangement area provided with the hole, there is provided a space extending in a direction crossing the work insertion hole, whereby the work insertion hole arrangement area is separated into one half side and the other half side with the space part interposed therebetween. A glass sealing carbon heater, wherein work insertion holes are provided on the one half side and the other half side in a straight line.