JPH09245748A - Metal wire for glass sealing and bulb and electric parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable sealing with a high air tightness without leakage or cracks by specifying the layer thickness of a nickel layer formed outside a copper layer. SOLUTION: A metal wire 1 for glass sealing has a core wire made of an alloy of Fe 50wt.%-Ni 50wt.%, for example, and a Cu layer 3 is formed on the peripheral outside surface of this core wire 2, further, a Ni layer 41 of 0.1 to 1.0 in layer thickness is formed as the outer most layer on the outside surface of this Cu layer. Thereby, a fine oxide is formed on the outer most surface, adhesive property with glass is good, no leakage, cracks or the like occurs, a metal wire for air tightness sealing with a soft glass facilitating sealing work, a tube using this metal wire, and electric parts are obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal wire for sealing which is used for sealing bulbs and electronic parts such as light bulbs and fluorescent lamps in which a light emitting source is enclosed in a transparent airtight container typified by a glass bulb. Regarding

[0002]

2. Description of the Related Art Tubes such as light bulbs and fluorescent lamps are
A rare gas such as argon is enclosed in a glass bulb forming the translucent container to suppress the evaporation of the filament to improve the luminous efficiency or as a luminous discharge medium, and the inside of the bulb is kept airtight. Since the bulb and stem that compose the tube are made of glass with almost the same coefficient of thermal expansion, they can be fused to easily maintain airtightness, but a metal wire is required as an introduction conductor for energizing the filament. As a metal wire for soft glass sealing, a Dumet wire having a coefficient of thermal expansion close to that of a glass member is well known and widely used.

This Dumet wire was completed in view of the coefficient of thermal expansion and fusion property to glass, and Fe (iron)
A Cu (copper) layer is formed on the Ni (nickel) alloy core wire, and the surface of the Cu (copper) layer is slightly blunted at the time of fusion with glass to prevent excessive oxidation. Therefore, a thin film of borax (B ₄ O ₇ Na ₂ ) having no water content, that is, so-called boration treatment is performed. And, the sealing between the borated metal wire for sealing and the soft glass is 7
It is carried out at about 80 to 820 ° C. and vitreous borax (B ₄
O ₇ Na ₂ ) is fused with the glass of the stem, and the Cu ₂ O (cuprous oxide) film on the surface of the metal wire for sealing is diffused in the glass to make a tight seal with the glass.

The metal wire for sealing is used only for the sealing portion with the glass, for example, it is connected to the internal lead wire portion for holding the filament in the bulb, the sealing portion with the glass, and the terminal of the base outside the bulb. In some cases, a lead wire is used in which each part of the external lead wire part is composed of three separate parts, but in the case of a small lamp for display, the inner lead wire part and the outer lead wire part are also metal wires to be sealed. Commonly used,
The lead-in wire may be composed of a single member.

When the lead-in wire such as a baseless bulb is composed of a single member, it is common that the filament forming the light emission source is tapped or sandwiched in the internal lead-in portion to hold the wire. (B ₄ O ₇ Na ₂ ) is an electrical insulator, and if this borax (B ₄ O ₇ Na ₂ ) film is broken and is not in direct contact with a conductor such as a Cu (copper) layer, it becomes a filament. The connection with the internal lead-in wire portion was uncertain and unstable, and the electric resistance in this connecting wire portion was liable to have momentary fluctuations. That is, even if the lead wire was energized, the filament sometimes flashed undesirably. In particular, this variation in resistance often occurs when vibration is applied to the light bulb.

In the case of a light bulb having a base, the external lead-in wire is connected to the metal terminal of the base by means such as soldering or welding, and in the case of a non-base light bulb, the sealing portion and the terminal are connected by simple pressure welding. However, if there is an insulating film on the surface of the external lead-in wire, there is a problem that the electric connection is unstable and the light bulb undesirably blinks.

Therefore, borax (B ₄ O ₇ Na ₂ ) at the connecting portion
Although the film has been removed by acid treatment, it is difficult to perform the removal treatment and the work of performing the plating treatment after the removal due to environmental problems.

Further, in the case where the lead-in wire is composed of three parts, the inner lead-in wire, the outer lead-in wire and the metal wire for sealing, the end faces of each other are joined by butt welding, but borax (B ₄ O _If there is a mixture of ₇ Na ₂ ), the joint strength may decrease.

In order to solve the above problems, therefore, a sealed wire having a Ni (nickel) layer formed on the surface of a Fe (iron) -Ni (nickel) alloy core wire or the surface of a Cu (copper) layer on the core wire. (Dumet wire) was developed and put into practical use, and this is disclosed in Japanese Patent Publication No. 46-3655 and Japanese Patent Laid-Open No. 50-10261. This N
When the sealing wire having the i (nickel) layer is also sealed to the glass, the Ni (nickel) layer is oxidized to improve the hermetic sealing property with the glass. However, in heating in the sealing operation, forming an oxide film on the sealing wire having the Ni (nickel) layer changed the amount and quality of the oxide film even if the heating conditions changed slightly, and it was difficult to control the oxide film. . The thickness of the Ni (nickel) layer formed on this conventional sealing wire is about 1.0 to 1.5 μm, and the NiO (nickel oxide) that can be generated on the surface even when sealing in an oxidizing atmosphere is used. Since it is difficult to diffuse into the glass, it is difficult to dissolve in the glass and leaks occur to lower the sealing property, so that reliable sealing may not be possible.

[0010]

Therefore, the present inventors have found that a sealing wire (Dumet wire) having a Ni (nickel) layer formed on this surface is electrically connected to the outside of the sealing part such as a connection with a filament. Since it has good properties, research was conducted to further improve the sealing property with glass.

The present invention eliminates the above-mentioned problems, has a dense oxide formed on the outermost surface, has good adhesion to glass, is free from the risk of leaks and cracks, and is easy to seal. An object of the present invention is to provide a metal wire for hermetically sealing with glass, a tube using the metal wire, and an electric component.

[0012]

The metal wire for glass sealing according to claim 1 of the present invention comprises a core wire, a copper layer formed on the surface of the core wire, and 0.1 to 1.0 μm outside the copper layer. And a nickel layer formed with a layer thickness of.

The Cu (copper) layer portion of the underlayer is N on the outer surface side.
Since the Ni (nickel) layer is diffused into the i (nickel) layer to form a Ni-Cu alloy, and the Ni (nickel) layer on the outer surface side is thin, Cu (copper) also diffuses to the surface. When the Ni-Cu alloy layer is sealed with the soft glass, Cu (copper) becomes a dense oxide having a good sealing property with the glass, that is, Cu ₂ O (cuprous oxide), and diffuses into the glass. The sealing can be performed with high airtightness. Further, since Ni (nickel) on the surface having high oxidation resistance is thin, it is less likely to be oxidized appropriately by alloying with Cu (copper) to hinder the hermetic sealing property with glass.

A metal wire for glass sealing according to claim 2 of the present invention comprises a core wire, a nickel layer formed on the surface of the core wire,
It is characterized in that a copper layer formed outside the nickel layer and a nickel layer formed with a layer thickness of 0.1 to 1.0 μm outside the copper layer are provided.

The same operation as in claim 1 is achieved.

The metal wire for glass sealing according to claim 3 of the present invention is characterized in that the copper layer is within a range of 0.1 to 0.5 μm from the outermost surface.

The same operation as described in claim 1 is achieved.

The metal wire for glass sealing according to claim 4 of the present invention is a single wire.

Even if one lead wire is used for both the inner lead wire portion, the outer lead wire portion and the sealing portion, there is no problem in terms of conductivity when connecting to the filament or the external terminal.
Further, in this case, welding with another wire is not necessary and the material can be saved.

The metal wire for glass sealing according to claim 5 of the present invention is characterized by having a portion where the outermost nickel layer is not formed.

Even if the Ni (nickel) layer is not formed on the outermost surface of the internal introduction line portion or the external introduction line portion other than the sealing portion, each has a function as an electrical connection member.
Further, in this case, welding with another wire is not necessary and the material can be saved.

The metal wire for glass sealing according to claim 6 of the present invention is characterized in that at least one end is connected to an internal lead-in wire and / or an external lead-in wire.

An internal lead-in wire and / or an external lead-in wire can be easily connected to the end of the sealing wire. That is, the lead-in wire is attached to the end portion of the sealing wire by 3 of the inner lead-in wire and the outer lead-in wire.
(3) parts wire connected to a wire, or a wire that connects both the sealed wire and the internal lead wire and connects the external lead wire to it, or a common wire that connects the sealed wire and the external lead wire, and connects the internal lead wire to this It may be a part line.

In the metal wire for glass sealing according to claim 7 of the present invention, the core wire is Fe-Ni alloy, Fe-Ni-Cr alloy,
Fe-Ni-Co alloy, Fe-Mo-Co-Si alloy,
Fe-Mo alloy, Fe-Co alloy, Fe-W alloy, Pt
It is characterized by being selected from.

A value selected from the above materials and having a coefficient of thermal expansion in the radial direction of the wire within the range of 85 to 105 × 10 ^-7 ° C ^-1 , which is the same as or approximate to the coefficient of thermal expansion of the soft glass to be sealed. Anything will do. Further, various core wires and metal layer materials can be selected depending on the glass material and price of the material to be sealed.

The tube according to claim 8 of the present invention is a light-transmissive container made of soft glass and any one of the above-mentioned items 1 to 7 sealed in a sealing portion of the light-transmissive container. The glass sealing metal wire described in 1. and an electrode electrically connected to the sealing metal wire in the container are provided.

It is possible to perform highly airtight sealing with a light-transmissive container made of soft glass, and to extend the life of the bulb. Also,
The bulb is not limited to the small bulb shown in the embodiment, but a bulb or stem made of soft glass is used as a translucent airtight container, a general-purpose bulb, a fluorescent lamp, a lighting tube, a discharge lamp such as a neon tube, or the like. Can be applied to Also,
In the case of a discharge lamp such as a fluorescent lamp, the filament is called an electrode, and instead of a filament electrode,
It may be a cold cathode made of a metal plate, a metal rod or a metal block. Further, these filaments (electrodes) may be electrically connected and mechanically held via other members without being directly connected to the sealing wire.

The tube according to claim 9 of the present invention comprises a transparent container made of soft glass, and a portion which is sealed to the sealing portion of the transparent container and is not formed with the outermost nickel layer. A glass sealing metal wire according to claim 5 or 6 extending outside the sealing portion, and an electrode electrically connected to the sealing metal wire inside the container. Characterize.

The same operation as described in claim 8 is achieved.

A tube according to a tenth aspect of the present invention is a translucent container made of soft glass, a soft glass stem sealed in a sealing part of the translucent container, and a stem. The glass sealing metal wire according to any one of claims 1 to 7 and an electrode electrically connected to the sealing metal wire in the container. . The stem made of soft glass can be sealed with high airtightness, and the life of the bulb can be extended.

The tube according to claim 11 of the present invention is a transparent container made of soft glass, a stem made of soft glass sealed in a sealing portion of the transparent container, and sealed to the stem. The metal wire for glass sealing according to claim 5 or 6, wherein the portion not having the outermost nickel layer is extended outside the sealing portion, and the metal wire for sealing in the container are electrically connected to each other. And an electrode connected to.

The same operation as described in claim 10 is achieved.

According to a twelfth aspect of the present invention, there is provided an electric component comprising a container made of soft glass, and the glass-sealing metal wire according to any one of the first to seventh aspects, which is sealed in the container. , And an electronic component element electrically connected to the metal wire for sealing in the container.

It is possible to perform highly airtight sealing with a container made of soft glass or the like, and to extend the life of electronic parts. INDUSTRIAL APPLICABILITY The present invention is applied to the sealing of electronic parts such as diode elements, switching elements and sensors in which main functional parts are housed in a container made of glass etc. such as dust resistance, moisture resistance, water resistance and oxidation resistance in addition to tubes. However, it can be applied. The elements may be electrically connected to the sealing wire directly or with a two-component wire or a three-component wire in which another wire or member is connected to the sealing wire.

According to a thirteenth aspect of the present invention, there is provided an electric component comprising a container made of soft glass, and a portion sealed with the container and having no outermost nickel layer formed therein, extending outside the sealed portion. The glass sealing metal wire according to claim 5 or 6 and the electronic component element electrically connected to the sealing metal wire in the container are provided. The same effect as in claim 12 is obtained.

[0036]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 shows a cross section of a metal wire for sealing glass, and FIG. 2 is a vertical cross sectional view of a small light bulb for display or the like using the metal wire for sealing.

In FIG. 1, reference numeral 1 is a lead-in wire, here a metal wire for glass sealing is formed, and Fe (iron) 5 is formed at the center, for example.
0% by weight-50% by weight Ni (nickel) alloy having a diameter of about 0.25 mm and a coefficient of thermal expansion (30 to 30) in the radial direction.
(0 ° C.) has a core wire 2 of 95 to 100 × 10 ⁻⁷ / ° C. ⁻¹ , and the outer peripheral surface of the core wire 2 has a thickness of C of about 1 μm.
A u (copper) layer 3 is formed, and on the outer surface of this Cu (copper) layer, a Ni layer having a layer thickness of about 0.3 μm is formed as an outermost layer.
A (nickel) layer 41 is formed.

In order to manufacture the lead-in wire 1 having such a structure, a C layer having a predetermined layer thickness is formed on the outer surface of the core wire 2 whose outer diameter is finished to a predetermined dimension.
Multilayer plating of u (copper) and Ni (nickel) to form Cu
The core wire 2 obtained by forming the (copper) layer 3 and the Ni (nickel) layer 41, or having a diameter larger than a predetermined size.
A Cu (copper) sleeve is covered with the above and rolled to form a Cu (copper) coated wire with a predetermined outer diameter, and this coated wire is covered with Ni.
It may be obtained by applying a (nickel) layer 41.

FIG. 2 shows a compact light bulb L1 using the metal wire 1 for glass sealing, which is made of soda lime glass or lead glass having an outer diameter of about 5 mm and a total length of about 10 mm (coefficient of thermal expansion). (30-300 ° C) is 85-10
5 × 10 ⁻⁷ / ° C. ⁻¹ ) provided with a valve 5 forming a light-transmitting airtight container, and this glass bulb 5 has a closed sealing portion 5
A pair of the metal wires 1 and 1 for sealing is sealed in 1 (which may be a sealed portion in which the valve is crushed or thinned). The metal wire 1 for sealing has an overall coefficient of thermal expansion (30-
300 ° C.) is, for example, 95 to 100 × 10 ⁻⁷ / ° C. ⁻¹
Then, a predetermined length, for example, about 15 mm is cut, and a sealing wire (sealed portion) 11 portion, an internal introducing wire 12 portion extending inside the valve 5, and an external introducing wire 13 extending outside the valve 5.
It consists of a single line that is common to the parts.

Then, the internal lead-in wires 12, 1 in the valve 5
A filament 6 around which a tungsten wire is wound as a light emitting source is connected between the tips of the two by means such as clamping or welding. The Ni (nickel) layer 41 on the outermost surface is a good conductor. There will be no poor contact at this connection,
It provides a reliable electrical connection and holds the filament 6. Also, the external lead-in wire 1 extending from the sealing portion 51 to the outside of the valve 1
3 and 13 are separated so as not to contact each other. The valve 5 is filled with an inert gas such as argon or is in a vacuum atmosphere.

In the above small-sized light bulb L1, the burner heat for melting and heating the bulb 5 in the sealing portion 51 during the work of sealing the lead-in wires 1, 1 to the bulb 5 is close to the bulb 5 (sealing wire 11). The Ni (nickel) layer 41 on the outermost surface in the atmosphere and the Cu of the base layer are also heated.
The portion of the (copper) layer 3 is oxidized and the glass of the bulb 1 is diffused into this layer so that they are closely adhered and hermetically sealed.

More specifically, the lead-in wire 1 according to the present invention is heated so that the underlayer Cu (copper) layer 3 is formed.
The portion diffuses to the Ni (nickel) layer 41 portion on the outer surface to form a Ni-Cu alloy, and since the Ni (nickel) layer 41 on the outer surface is thin, Cu (copper) also diffuses to the surface. Then, Ni with Cu (copper) diffused on the surface side
Among the Cu alloys, Cu (copper) becomes dense Cu ₂ O (cuprous oxide) and diffuses in the glass to achieve highly airtight sealing.

Thus, the coefficient of thermal expansion of 11 parts of the sealing wire (sealed portion) of the metal wire 1 used for sealing the soft glass bulb 5 is similar to that of the glass to be sealed. It is essential that the Ni (nickel) layer 41 formed on the sealing wire (sealed portion) 11 is a thin layer.
There is no or little stress, and there is no occurrence of cracks or the like in the sealing portion 51 due to leakage or strain.

The external introduction wire 13 extending outside the sealing wire (sealed portion) 11 of the above-mentioned introduction wire 1 by a sealing operation or the like.
The portion does not heat up as much as the sealing wire (sealed portion) 11, and Ni of the outermost layer is excellent in oxidation resistance and corrosion resistance and is hard to oxidize. It is also possible to do so or to solder the terminal board. The diffusion of the Cu (copper) layer 3 portion, which is the underlayer, to the Ni (nickel) layer 41 portion on the outer surface is not dependent on the heating at the time of sealing with the glass bulb 5 described above, but is separately performed. It may be performed during bright annealing of the sealing wire (at 950 ° C. for 20 seconds).

Next, in order to examine the sealing strength in the structure of the small light bulb L1, the outermost Ni (nickel) layer 4 is used.
The tensile strength (FIG. 3) and the oxidation resistance (Table 1) of the lead-in wire 1 at the interface of the sealed wire (sealed portion) 11 of the sealed portion 51 were investigated by changing only the layer thickness of one portion. .

In this tensile strength test, the small light bulb L1 shown in the above-mentioned embodiment is fixed to a jig, the external lead-in wire 13 is pulled, and the load (kgf) when the lead-in wire 1 comes out of the sealing portion 51. )investigated. (Note that this test condition is considerably more severe than in actual use.) In FIG. 3, the horizontal axis represents the layer thickness (μm) of the outermost Ni (nickel) layer 41, and the vertical axis represents the tensile strength ( kgf) is shown. From this Figure 3 Ni
It can be seen that as the layer thickness of the (nickel) layer 41 becomes thicker, the tensile strength decreases, but this is considered to be because the oxidation is less and the adhesion with the glass becomes worse. And Ni
The tensile strength is maximum when the layer thickness of the (nickel) layer 41 is about 1.0 μm, but if it is about the same as when the Ni (nickel) layer is not formed on the outer surface side of the Cu (copper) layer 3. Allowed up to about 1.2 μm.

Table 1 shows the relationship between the oxidation resistance and the layer thickness of the Ni (nickel) layer 41 formed on the metal wire 1 for sealing, and shows the oxidation of the external lead-in wire 13 after the small light bulb L1 is turned on. The results are shown in Table 1. The circles indicate that Ni (nickel) has metallic luster and no discoloration, and the crosses indicate that Ni (nickel) metallic luster is dull and discoloration occurs.

[0048]

[Table 1]

From Table 1, if the layer thickness of the Ni (nickel) layer 41 is 0.1 μm or more, the generation of oxidation after lighting the small light bulb L1 is extremely low, and there was no problem in practical use. When the thickness of the Ni (nickel) layer 41 is less than 0.1 μm, the oxidation proceeds excessively to form an oxide film having poor adhesion to the underlying layer, and the corrosion resistance is poor. Further, the thicker the layer, the less the oxidation, but if it exceeds 1.0 μm, the heat treatment for diffusing Cu (copper) to the surface side causes the Ni (Ni) to the underlying Cu (copper) layer
The diffusion amount of (nickel) also increases, and as a result, the introduction line 1
It also causes a change in characteristics such as an increase in electric resistance and a decrease in thermal conductivity.

Tensile strength, oxidation resistance of these lead wires 1,
Considering the corrosion resistance and the characteristic variation, the layer thickness of the Ni (nickel) layer 41 of the outermost surface layer of the lead-in wire 1 is 0.1 to 0.1.
Within the range of 1.0 μm, leaks and cracks from the interface between the sealing wire 11 and glass and the internal or external lead-in wire 1
The degree of oxidation of 2 and 13 had practically no problem in electrical connection with the filament and the terminal plate.

Although the Ni (nickel) layer 41 is formed on the outermost surface of the lead-in wire 1 (sealing metal wire) in the above embodiment, the core wire 2 and the Cu (copper) layer 3 forming the lead-in wire 1 are formed. A Ni (nickel) layer may be formed between and.
This is, for example, Fe (iron) 4 at the center as shown in FIG.
8 to 51 wt% -Ni (nickel) 49 to 52 wt% alloy having a diameter of about 0.25 mm and a radial thermal expansion coefficient (30 to 300 ° C.) of 95 to 100 × 10 ⁻⁷ / ° C. ⁻¹
Core wire 2 and a Ni (nickel) layer 4 having a thickness of about 1.0 μm on the outer surface around the core wire 2 by plating or the like.
2 is formed, a Cu (copper) layer 3 having a layer thickness of about 0.2 μm is formed on the outer surface of the Ni (nickel) layer 42, and further, an outermost layer is formed on the outer surface of the Cu (copper) layer. A Ni (nickel) layer 41 having a layer thickness of about 0.2 μm is formed.

When the lead-in wire 1 having such a structure is sealed with the bulb 5 formed of soft glass used in a small light bulb or the like, burner heat for melting and heating the bulb 5 is applied to the bulb 5 as in the above-described embodiment. By heating the sealing wire 11 portion close to 5 as well, the lower Cu (copper) layer 3 portion diffuses to the outer surface Ni (nickel) layer 41 portion, and Ni-
Form Cu alloy and Ni (nickel) on the outer surface
Since the layer 41 is thin, Cu (copper) also diffuses to the surface.
Then, Cu (copper) present in the Ni—Cu alloy layer is oxidized to form dense Cu ₂ O (cuprous oxide), and the valve 6
The glass of (3) diffuses into this layer, and the two adhere to each other to obtain high airtightness. At this time, about 3 μm on the glass side from the interface between the outermost metal layer 5 of the sealing wire 11 and the glass of the bulb 6.
It was confirmed that Cu (copper) was diffused up to.

In this case, the lead-in wire 1 has Ni (nickel) excellent in oxidation resistance and corrosion resistance in the peripheral portion near the core wire 2.
Since a thin Cu (copper) -Ni (nickel) alloy layer is formed on the outermost surface portion of the layer 42, Cu (copper) -Ni (nickel) does not pose a problem in normal heating in the atmosphere.
The Cu (copper) portion in the alloy layer becomes dense Cu ₂ O (cuprous oxide) and can be fused with glass. Even if the heating is too strong and the Cu (copper) portion is over-oxidized, The lower Ni (nickel) layer 42 is not overoxidized, and the glass is the same as the outermost surface alloy layer and the Ni (nickel) layer 42.
It spreads to the inside and can be sealed with high airtightness.

Table 2 shows the results of various strength tests conducted on the lead-in wire itself and the small light bulb formed by sealing the lead-in wire with the bulb. The test is the same as the above (there is also a partial test). 1) Leak generation test after fixing the sealing part of the light bulb and pulling the external lead-in wire portion by 2 kgf in the extension direction, 2) Also at 2 kgf Strength test that the sealed wire (sealed part) part of the lead-in wire after pulling is separated from the glass, 3) Strength test when pulled at 3.5 kgf as well (breakdown of the lead-in wire means cutting of the lead-in wire) Without being broken, the introduction line is cut from the interface between the introduction line and the glass, and cutting with the introduction line means that the introduction line is cut without breaking the sealing portion.),
4) Use a 10% potassium cyanide aqueous solution (at2
Leak generation test after immersion in 0 ° C), 5) Introduced wire (sealing wire) at about 600 ° C in air, measured increase in oxidized weight after 3 minutes. It was carried out. (Note that these test conditions are considerably more severe than in actual use.)

[Table 2]

From these test results 1) to 5), even when the Ni (nickel) layer 42 is formed between the core wire 2 and the Cu (copper) layer 3, the airtight adhesion to glass is higher than that of the conventional product. It was confirmed that it was excellent.

FIG. 5 shows another embodiment of the lead-in wire 1 of the present invention, and FIG. 6 shows another embodiment of a tube (only the main part is shown) using the lead-in wire 1 of FIG. In the figure, the same parts as those in FIGS. 1 and 2 are designated by the same reference numerals and the description thereof will be omitted. In the above embodiment, the introduction wire 1 has been described as a metal wire for sealing with glass made of a single wire, but the ones in FIGS. 5 and 6 are bulbs for general lighting having a structure in which the bulb end is closed. 3 shows a stem 8 used for a bulb such as a fluorescent lamp or a fluorescent lamp L2. The stem 8 has a flare portion 82 in which one end of a stem tube 81 made of lead glass, for example, is expanded so as to match the opening portion of the valve 5, and is provided in the melt-crushed pinch seal portion 83 on the other end side. Seals the sealing wire 11 part of the pair of lead wires 1 and 1 airtightly. In addition,
Reference numeral 84 is an exhaust pipe, and reference numeral 7 is a phosphor film formed on the inner surface of the bulb 1.

The lead-in wire 1 has three wire rods, that is, only the portion embedded in the pinch seal portion 83 is used as a sealing wire 11, and the inner lead-in wire 12 and the outer lead-in wire 13 are provided at the ends of the sealing wire 11. Are connected by welding (point 14) or the like. Generally, the sealing parts 51 and 83 are formed by joining dissimilar members of glass and metal, and the sealing line 11 part is preferably as thin as possible in consideration of current capacity and the like. Also, internal lead-in line 1
Since 2 must support the filament 6 and electrodes to withstand vibration and shock, it must be toughened by increasing its diameter. In addition, the external lead-in wire 13 is directly connected to a terminal member or a base or the like to directly turn on the lamp, and when an abnormality occurs, the fuse is blown to prevent the effect on others by simply blowing the fuse. It has not only power supply but also other roles.

The lead-in wire 1 consisting of these three wire rods
Among them, the sealing wire 11 part is made of a wire having the configuration shown in FIG. 1, the internal introduction wire 12 is, for example, a Ni (nickel) wire, and the filament 6 is connected to the end portion, and the external introduction wire 13 is, for example, Cu ( Copper) wire. The lead wires 1 and 1 sealed in the pinch seal portion 83 of the stem 8 are also sealed to the stem glass while maintaining high airtightness similarly to the above-described embodiment, and leaks or cracks in the sealed portion. It is possible to provide a long-life lamp that does not generate Further, the inner lead wire 12 and the outer lead wire 13 can be selected from materials, diameters, etc. suitable for their respective roles different from the sealing wire 11.

The present invention is not limited to the above-mentioned embodiment, and for example, the sealing of the metal wire for glass sealing may be done by crushing sealing (pinch seal, button stem, etc.), shrink sealing, or the like. .

Further, the present invention is not limited to the above-mentioned bulb as a container in which a metal wire for glass sealing is sealed, and is mainly used in a container made of glass such as dust resistance, moisture resistance, water resistance and oxidation resistance. It can also be applied to the sealing of electronic parts such as diode elements, switching elements and sensors in which functional units are housed. The elements may be electrically connected to the sealing wire directly or with a two-component wire or a three-component wire in which another wire or member is connected to the sealing wire.

Further, each wire rod and wire diameter of the lead-in wire may be appropriately selected and determined in accordance with the structure, purpose, type, rating, load, use, price, etc. of the tube or the electronic component.

[0062]

According to the invention of claims 1 to 3, the nickel layer formed on the outside of the copper layer has a layer thickness of 0.1 to 1.0.
By setting the thickness to be μm, a dense oxide film having a good sealing property can be obtained, and sealing can be performed with a soft glass having a similar thermal expansion coefficient to prevent the generation of leaks and cracks and to achieve a highly airtight sealing.

Further, in the invention of claim 4, even if the internal lead-in wire portion and the external lead-in wire portion are shared by a single lead-in wire, there is a possibility that there will be some trouble in terms of conductivity when connecting to the filament or the external terminal. Absent.

Further, in the invention of claim 5, even if the Ni (nickel) layer is not formed on the outermost surface portion other than the sealing portion, each has a function as an electrical connecting member.

According to the sixth aspect of the invention, the end of the sealing wire can be connected to the sealing wire and an internal lead wire or an external lead wire having a different diameter or toughness, and the mount can be held in the container. Can be strengthened, and the external lead-in wire outside the container can have a fuse function. Further, in the invention of claim 7, various core wires and metal layer materials can be selected according to the glass material to be sealed and the price.

Further, in the inventions of claims 8 to 11, the effects as described in the above claims 1 to 7 are obtained, and at the same time, a transparent container or stem made of soft glass and a highly airtight seal are provided. It is possible to wear the tube, and it is possible to provide a bulb having a long life.

Further, in the inventions of claims 12 and 13, the same effects as those described in the above claims 1 to 7 are obtained, and the container is made airtight with a soft glass container or the like accommodating electronic parts. It is possible to provide a highly sealed electrical component with a long service life.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an enlarged embodiment of a metal wire for glass sealing of the present invention.

FIG. 2 is a vertical sectional view showing an embodiment of a small light bulb of the present invention.

FIG. 3 is a graph comparing the Ni (nickel) layer thickness (μm) of the sealing portion of the metal wire for glass sealing with the pull-out strength (kgf) at which the sealing metal wire comes off from the sealing portion.

FIG. 4 is an enlarged cross-sectional view showing another embodiment of the metal wire for glass sealing of the present invention.

FIG. 5 is a front view showing another embodiment of the lead-in wire of the present invention.

FIG. 6 is a longitudinal cross-sectional view of a main part showing another embodiment of the tube of the present invention.

[Explanation of symbols]

 1: Metal wire for glass sealing (introduction wire) 11: Sealing wire part (sealed part) 12: Internal introduction wire 13: External introduction wire 2: Core wire 3: Cu (copper) layer 41, 42: Ni (nickel) ) Layer 5: Glass bulb (translucent airtight container) 51: Sealing part 6: Filament (electrode) 8: Stem L1: Small light bulb (tube) L2: Fluorescent lamp (tube)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shogo Engo 1-29 Nakamachi, Kadoma City, Osaka Prefecture

Claims (13)

[Claims] 1. A core wire; a copper layer formed on the surface of the core wire; and a nickel layer formed outside the copper layer to a thickness of 0.1 to 1.0 μm. Metal wire for glass sealing. 2. A core wire; a nickel layer formed on the surface of the core wire; a copper layer formed outside the nickel layer; and a layer thickness of 0.1 to 1.0 μm formed outside the copper layer. A metal wire for glass sealing, comprising: a nickel layer; 3. The copper layer is 0.1 to 0.5 μm from the outermost surface.
The metal wire for glass sealing according to claim 1 or 2, wherein the metal wire is for glass sealing. 4. The single line is a single line.
The metal wire for glass sealing according to any one of claims 1 to 3. 5. The metal wire for glass sealing according to claim 4, which has a portion where the outermost nickel layer is not formed. 6. The glass-sealing metal wire according to claim 1, wherein an internal lead-in wire and / or an external lead-in wire is connected to at least one end portion. 7. The core wire is Fe-Ni alloy, Fe-Ni-C
r alloy, Fe-Ni-Co alloy, Fe-Mo-Co-S
The metal wire for glass sealing according to any one of claims 1 to 3, which is selected from i alloy, Fe-Mo alloy, Fe-Co alloy, Fe-W alloy, and Pt. . 8. A light-transmissive container made of soft glass; and a glass-sealing metal wire according to any one of claims 1 to 7, which is sealed in a sealing portion of the light-transmissive container. A tube comprising: an electrode electrically connected to a metal wire for sealing in a container; 9. A translucent container made of soft glass; the above-mentioned claim, wherein a part of the translucent container that is sealed to the sealing part and is not formed with the outermost nickel layer extends outside the sealing part. Item 5
A bulb comprising the glass sealing metal wire according to claim 6; and an electrode electrically connected to the sealing metal wire in the container. 10. A translucent container made of soft glass; a soft glass stem sealed to a sealing part of the translucent container; and the stem sealed to the stem according to any one of claims 1 to 7. A tube comprising the metal wire for sealing glass described in any one of the above; and an electrode electrically connected to the metal wire for sealing in a container. 11. A translucent container made of soft glass; a soft glass stem sealed to a sealing part of the translucent container; and a stem outermost nickel layer formed on the stem. 7. The glass sealing metal wire according to claim 5 or 6, wherein a non-existing portion extends outside the sealing portion; and an electrode electrically connected to the sealing metal wire inside the container. A tube characterized by being. 12. A container made of soft glass; a metal wire for glass sealing according to any one of claims 1 to 7 sealed to the container; and an electric wire for sealing metal wire in the container. And an electronic component element electrically connected to each other; 13. A container made of soft glass; and a part sealed with the container and having no outermost nickel layer formed therein, extending outside the sealed part. An electrical component comprising: a metal wire for sealing glass; and an electronic component element electrically connected to the metal wire for sealing in a container.