JP2000048718A - Lamp and method of manufacturing the lamp - Google Patents

Abstract

(57) Abstract: An electrode set composed of a current introduction line having a metal foil connected to one end in a tube composed of a light emitting part glass and a side tube part glass extending to the light emitting part glass. Provided is a lamp in which a three-dimensionally sealed lamp is provided, which enhances adhesion between a side tube glass and a metal foil and does not deteriorate glass strength at a connection portion between a light emitting unit glass and a side tube glass. SOLUTION: A first portion of a side tube glass where a current introduction line is located is heated and compressed with a first pressure, and then a second portion of a side tube glass where a metal foil is located is heated. A lamp manufactured by compressing at a second pressure, wherein the second pressure is greater than the first pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp having a special structure for sealing an electrode and having an internal pressure of 1 atm or more during lighting and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, high pressure discharge lamps have been used in houses, facilities,
It has been widely used for general lighting in stores and the like. Recently, overhead projectors, projection TVs,
It has also been used as a light source for projectors and the like. that is,
This is because the high-pressure discharge lamp emits light with very high brightness.

[0003] In particular, in recent years, attempts have been actively made to reduce the length of the discharge arc so as to approach a point light source.
However, as the discharge arc length decreases, the lamp voltage decreases. Therefore, an attempt to operate with the same lamp power results in an increase in lamp current. The increase in lamp current is
This leads to an increase in electrode loss, activates evaporation of electrode material, and leads to early deterioration of the electrode, that is, shortening of lamp life. For this reason, when shortening the arc length, it is common to increase the mercury vapor pressure during lamp operation to prevent a decrease in lamp voltage (increase in lamp current).

In order to increase the mercury vapor pressure during lamp operation, it is necessary to provide a structure that does not cause the lamp to crack at the high operating pressure.

FIG. 11 is a configuration diagram of a conventional high-pressure discharge lamp. Reference numeral 100 denotes a light emitting unit where a discharge arc exists, 101
Denotes a side tube extending from the light emitting unit 100. Light emitting unit 10
The side tube portion 101 is made of quartz glass. Light emitting unit 1
00 is filled with a gas that becomes a high pressure during lighting.
Reference numeral 102 denotes an electrode rod for introducing a current into the light emitting unit 100. The electrode rod material is generally tungsten.
The thermal expansion coefficient of tungsten is 5.2 * 10 <-6>, whereas that of quartz glass is 5.5 * 10 <-7>, which is about an order of magnitude different. It is technically difficult to form two kinds of sealings which differ greatly in this way.

[0006] A sealing method for this purpose is to connect a metal foil 104 between the electrode rod 102 and the external current introducing wire 103,
A foil sealing structure for hermetically sealing glass with the metal foil is known. A very thin metal foil plastically deforms, thereby absorbing the difference in the coefficient of thermal expansion between glass and metal, and enables sealing.

Heretofore, there has been pinching sealing as a method of manufacturing this foil-sealed lamp. Hereinafter, conventional pinching sealing will be described with reference to FIG. The glass tube 110
The quartz glass tube is heated and expanded with a glass tube created in another process, thereby forming a light emitting section 100 having a predetermined shape. An undeformed quartz glass tube is connected to both ends of the light emitting unit 100 as a side tube unit 101. Glass tube 1
10 is held by the chuck 113. Light emitting unit 100
The end of the electrode rod 102 for holding a discharge arc is disposed on the side tube part 101, the electrode rod 102, the metal foil 104 connected to the other end of the electrode rod 102, and the external current introduction wire 103 are arranged.

Further, the side tube portion 101 is kept in a rare gas atmosphere in order to prevent electrode oxidation during the sealing step. The glass of the side tube portion 101 is heated and melted by a burner 111 and crushed by a molding die 112 from two directions perpendicular to the plane portion of the metal foil 104. The molding die 112 crushes the entire side tube part 101. The reason is that the electrode rod 102 is fixed. Since the metal foil 104 is extremely thin as described above, crushing only the foil portion does not fix the electrode rod 102.

[0009]

However, such a sealed lamp has two problems.

The glass of the electrode rod 102 and the glass of the side tube portion 101 are not hermetically sealed due to the difference in thermal expansion coefficient. Therefore,
A gap is formed between the electrode rod 102 and the glass of the side tube part 101.

FIG. 13 shows a cross-sectional shape of the side tube along the line 105 shown in FIG. 120 is a side tube glass.
Reference numeral 121 denotes a gap between the electrode rod 102 and the side tube glass 120. The shape of the gap 121 has a sharp notch 122 due to crushing of the glass from two directions. Notch 1
There is a problem that the concentration of stress acts on 22 and the lamp is broken at a pressure lower than the withstand pressure of glass originally.

The second problem is the crack 1 shown in FIG.
06. The crack 106 is a crack generated in the side tube glass where the electrode rod 102 is located. Most of the cracks generated during sealing are generated due to the difference in the thermal expansion coefficient between the electrode rod and the glass. However, these cracks have the function of reducing the stress generated between the electrode bar and the glass when the lamp is turned on and off. Therefore, a crack generated due to a difference in thermal expansion coefficient does not hinder the lamp.

However, there is a crack which is generated by a different mechanism from a crack which is generated due to a difference in thermal expansion coefficient. Electrode rods do not undergo plastic deformation unlike metal foil.
Therefore, when the side tube glass is hit against the electrode rod with a strong pressure, the glass is cracked by the impact. At the crack tip, stress concentration occurs, further reducing the breakdown voltage of the lamp. That is, a crack which occurs due to a difference other than the difference in the thermal expansion coefficient between the glass and the electrode rod is the second problem.

In order to solve the above two problems, there is a vacuum sealing method. FIG. 14 shows an example of a reduced pressure sealing method. The glass tube 110 is held by the chuck 126. An end portion of an electrode rod 102 for holding a discharge arc is arranged on the light emitting section 100, and the electrode rod 102 is provided on the side tube section 101.
And a metal foil 104 connected to the other end of the electrode rod 102 and an external current introducing line 103 are arranged. Inside the glass tube 110,
Keep under reduced pressure. While rotating the glass tube 110 in the circumferential direction of the tube (indicated by a substantially arrow 128), the burner 12
At 7, the side tube 101 is uniformly heated and melted. Side tube 101
The glass is reduced in diameter by a pressure difference between the inside and outside of the glass tube 110,
Finally, the metal foil 104 and the side tube portion 10 where the metal foil is located
One glass is hermetically sealed.

According to this method, since the diameter of the glass is uniformly reduced to the electrode rod, the gap between the glass and the electrode rod becomes substantially circular, and the notch where the concentration of stress occurs is reduced. Disappears. Further, since the sealing pressure does not exceed the atmospheric pressure, no shock is applied to the glass at the time of sealing.

However, in this reduced pressure sealing method, since the sealing pressure of the metal foil does not exceed 1 atm, the plastic deformation of the metal foil is not sufficient, and the adhesion between the metal foil and the glass tube is weak. The challenge remains.

Therefore, using a mold that uniformly crushes the glass (for example, a polygonal mold or a circular mold), the gap between the electrode rod and the glass is made to have no cutout. The crack which occurred in the side tube part glass in which the electrode rod is located was tried to remove it later.

For example, Japanese Patent Application Laid-Open No. 5-159743 attempts to remove cracks by reheating and gradually cooling the side tube after pinching and sealing.

However, in order to remove cracks, it is necessary to raise the glass temperature to the softening point again. The softening point of quartz glass is 1,683 degrees. FIG. 11 shows a state of the crack 106. In particular, the location 122 (FIG. 13) where the crack occurs is the side tube portion 101 in which the electrode rod is embedded adjacent to the light emitting portion 100, so the light emitting portion 100 is also greatly affected by the temperature rise. The light emitting portion 100 is formed in a substantially spherical shape, and the end portion of the light emitting portion adjacent to the side tube portion has a small glass thickness, and is easily deformed particularly when the temperature is increased. Deformation of the arc tube is the coldest point in the arc tube when the lamp is lit (when the axial direction of the side tube is used horizontally,
The temperature at the lowest point of the light emitting unit 100 in the direction of gravity is changed. The vapor pressure of the luminescent substance in the lamp is determined by the coldest point temperature in the luminous tube at the time of lighting. That is, the deformation of the arc tube changes the vapor pressure of the luminous substance in the lamp and changes the spectral characteristics. For these reasons, it is difficult to remove cracks after the sealing step.

Further, the discharge lamp has been described above. However, in the case where the current introduction line is hermetically sealed in the glass tube, the same problem is posed without specifying the discharge lamp. That is, incandescent lamps such as halogen bulbs have the same problem.

The present invention has been made in view of such circumstances, and an object of the present invention is to eliminate the concentration of stress generated in the gap between the glass and the electrode rod, and to reduce the concentration of stress on the side tube glass where the electrode rod is located. , Minimize the occurrence of cracks other than the difference in the coefficient of thermal expansion between glass and electrode rods, and
An object of the present invention is to provide a lamp having a high pressure resistance structure in which the adhesion between a metal foil and glass is enhanced.

[0022]

According to the present invention, in order to achieve the above object, an electrode assembly composed of at least a current introduction line and a metal foil connected to the current introduction line is hermetically sealed. A method for manufacturing a discharge lamp,
In a glass bulb composed of at least a light emitting portion and a side tube portion extending to the light emitting portion, a metal foil portion is inserted in a state where the electrode assembly is inserted so that a part of the current introduction line is located in the light emitting portion. In a step of hermetically sealing the lamp, the lamp is manufactured through a step of compressing the side tube portion where the metal foil portion is located by a pressure larger than the pressure for compressing the side tube portion where the current introduction line is located. .

The lamp of the present invention also has a light-emitting portion made of glass, a side tube portion extending from the light-emitting portion and made of glass, and a part disposed in the light-emitting portion, and one end connected to a metal foil. And a current introduction line hermetically sealed to the side tube portion, and a cross section of a gap between the current introduction line and the side tube portion in a direction perpendicular to the current introduction line axis has the current introduction line. The side tube portion glass, which has a shape substantially similar to the cross section of the line and in which the metal foil portion is located, is compression molded by a mold.

In the lamp according to the present invention, a current introduction line partially disposed in the light emitting section, one end of which is connected to a metal foil, and hermetically sealed in a side tube extending from the light emitting section is provided. Having, the gap between the current introduction line and the side tube portion, the cross-sectional shape in the direction perpendicular to the current introduction line axis is a smooth shape without a notch such that concentration of stress occurs, The side tube portion where the metal foil is located is compression-molded by a molding die.

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(Embodiment 1) Hereinafter, Embodiment 1 of a discharge lamp according to the present invention will be described with reference to FIGS. FIG. 3 is a diagram showing a discharge lamp according to Embodiment 1 of the present invention.

In FIG. 3, reference numeral 1 denotes a light emitting portion made of glass, and reference numerals 2a and 2b denote side tube portions made of glass extending from the light emitting portion 1, respectively. Also, there is an electrode rod 3
And an external current introduction line 5 connected to a current source (not shown)
And the electrode assembly with the metal foil 4 connected between them is hermetically sealed. The light emitting portion 1 is filled with a gas that becomes high in pressure during operation, similarly to a conventional discharge lamp.

FIG. 2A is an enlarged sectional view taken along the dashed line 6 in FIG. 3, and FIG. 2B is an enlarged sectional view taken along the dashed line 7 in FIG.

The structure of the lamp according to the first embodiment is such that the cross section of the gap between the electrode rod 3 and the side tube glass 2 is substantially similar to the cross section of the electrode rod, and It is characterized in that the side tube glass on which the metal foil 4 is located is formed by a mold. As shown in FIG. 2 (b), the side tube glass 2 according to the present invention has a first electrode rod 3 inserted and held therein.
And a second portion into which the metal foil 4 is inserted and held. In the first embodiment, in the manufacturing method, the first portion is first softened by heating and reduced in diameter by a reduced pressure sealing method. In this case, the inside diameter of the glass tube is reduced to a pressure lower than the atmospheric pressure to reduce the diameter. Subsequently, as shown in the lower right of FIG. 1, the molding die is set at one of the levels L1, L2, or L3, that is, at the connection portion between the electrode rod 3 and the metal foil 4, and pinch-sealed. I do. In this regard, in the conventional pinching-sealed lamp, the molding die is
As shown in the lower left of FIG. 1, the measurement was performed at the position of the level L0 which is the boundary between the light emitting unit 1 and the side tube unit 2. In the manufacturing process of the present invention, the pressure applied to the second portion of the side tube glass has a larger value than the pressure applied to the first portion because of the diameter reduction. As a result, stress is evenly applied to the side tube glass of the first portion, and it is possible to prevent a crack from being easily generated. Improves the adhesion to the tube glass. The boundary between the first portion and the second portion may be any portion as long as the electrode bar 3 and the metal foil 4 overlap or in the vicinity thereof.

FIG. 1 is a view for explaining the difference between the conventional lamp and the lamp according to the first embodiment.
The cross-sectional shape of each part is shown. Conventional configuration lamps are a lamp with pinching sealing and a lamp with pressure reduction sealing. In the pinching-sealed lamp, although the adhesion between the metal foil and the side tube glass is strong, there is a cutout portion where stress concentration occurs in the gap between the electrode bar and the side tube glass. Further, in the vacuum sealed structure lamp, although no stress concentration occurs in the gap between the electrode rod and the side tube glass, the adhesion between the metal foil and the side tube glass is weakened.

Unlike the conventional sealed structure lamp, the sealed structure like the discharge lamp of the first embodiment eliminates the concentration of stress generated in the gap between the electrode rod and the side tube glass. In addition, the adhesion at the metal foil portion is high. In the lamp of the present invention, when the second portion of the side tube portion glass is broken, the side tube portion glass does not crack in such a manner that the metal foil portion is peeled off. In the direction of holding.

As described above, the cross-sectional shape of the gap between the electrode rod 3 and the first portion of the side tube glass 2 may be a smooth shape without a cutout portion where stress concentration occurs. desired. For example, it is circular, substantially circular, or elliptical, substantially elliptical, and the like.

It is preferable that the second portion of the side tube glass 2 where the metal foil portion 4 is located extends to the vicinity of the connection portion between the electrode rod and the metal foil. Thereby, the adhesion between the metal foil and the side tube glass can be further improved.

(Embodiment 2) Hereinafter, an incandescent lamp according to a second embodiment of the present invention will be described with reference to FIGS. FIG.
FIG. 3 is a diagram showing an incandescent lamp according to a second embodiment.

In FIG. 4, reference numeral 200 denotes a light emitting portion made of glass, and reference numeral 201 denotes a side tube portion made of glass extending from the light emitting portion 200. In addition, each end has a metal foil 203
Are connected to the light emitting unit 200, a current introduction line 202 partially formed in a coil shape is connected to the other end of the metal foil, and an external current introduction line 204 connected to a current source is connected to the other end of the metal foil. The electrode assembly is hermetically sealed in the side tube part 201. The light emitting section 200 is filled with a gas that becomes high in pressure during lighting.

FIG. 5 is a sectional view along the side tube glass 210 where the current introduction line 202 of FIG. 4 is located (FIG. 5A).
And the cross-sectional shape (FIG. 5B) along the side tube portion 211 is enlarged.

The structure of the lamp according to the second embodiment is such that the cross-sectional shape of the gap between the current introduction line 202 and the side tube glass is substantially similar to the cross-sectional shape of the current introduction line 202 and the metal foil 203 Is characterized in that the side tube glass in which is located is molded by a mold.

In the incandescent lamp according to the second embodiment, stress generated in the gap between the electrode rod and the side tube glass is not concentrated, and the adhesion at the metal foil portion is high.

(Embodiment 3) FIGS. 6 to 9 are diagrams illustrating an embodiment of a method of manufacturing a lamp according to the present invention.
In FIG. 6, reference numeral 10 denotes a glass tube formed in another process, which is a quartz glass tube heated and expanded to form a light emitting portion 11 formed in a predetermined shape, and quartz glass extending from both ends of the light emitting portion 11. It is composed of side tube portions 12a and 12b of the tube. The end of the one side tube portion 12a is sealed.

On the other hand, a current introducing wire 22 is connected to the electrode rod 20, the metal foil 21 connected to the electrode rod 20, and the metal foil end opposite to the metal foil end to which the electrode rod 20 is connected. A spring 23 is attached to an end of the metal introduction wire 22 on a side of the certain electrode assembly 13 that is not connected to the metal foil. The electrode assembly 13 with the spring 23 is inserted through the opening of the side tube portion 12b.
Is inserted, and the unconnected end of the metal foil of the electrode rod is arranged on the light emitting unit. The spring connected to the electrode assembly 13
By pressing the inner surface of the side tube glass, the electrode assembly 13 is fixed at a predetermined position.

In this state, first, after evacuation is performed from the opening of the side tube portion 12b, 200 mbar of argon gas is sealed from the opening of the side tube portion 12b. Then, the vicinity of the end of the side tube portion 12b whose end is not yet sealed is heated by the burner 30 and sealed as shown in FIG.

Subsequently, as shown in FIG.
The end of the side tube portion 12a of the glass tube 10 in which the electrode assembly 13 is inserted with 00 mbar is sandwiched and held by the chuck 40. Next, the glass tube 10 rotates in the circumferential direction of the bulb (indicated by a substantially arrow 42). Then, the burner 41, which is a heating element, uniformly heats and softens a portion from the boundary between the light emitting portion 11 and the side tube portion 12b to a part of the metal introduction wire 22 located in the side tube portion 12b.

At this time, since the inside of the glass tube 10 is in a decompressed state, the pressure difference from the atmospheric pressure around the glass tube 10 causes
The inner diameter of the softened portion of the side tube portion 12b is reduced. In particular, the heating of the burner 41 and the rotation 42 of the glass tube 10 are stopped after the inner glass surface of the side tube portion 12b where the electrode rod 20 is located is reduced in diameter to near the electrode rod diameter.

Next, as shown in FIG. 9, the side tube portion 12b on which the metal foil 21 is located is crushed by a mold 43 from two directions perpendicular to the plane portion of the metal foil 21 (indicated by a substantially arrow 44). At this time, it is desirable to perform the crushing by the mold 43 almost simultaneously with stopping the heating of the burner 41. This is because crushing the glass in a sufficiently softened state improves the adhesion between the glass and the metal foil. Thus, the electrode sealing on the side tube portion 12b side is completed. The electrode sealing on the side tube portion 12a side is performed in the same manner as on the 12b side.

(Embodiment 4) Next, in the method for manufacturing a high-pressure discharge lamp according to the present invention, the electrode assembly 13 is connected to the side tube portion 1.
An embodiment of the step of hermetically sealing the inside of 2b will be described. FIG. 10 illustrates a method of manufacturing a seal by high-frequency dielectric heating.

In FIG. 10, 50 is a magnetron for performing high-frequency dielectric heating, and 51 is an antenna for oscillating microwaves. 52 is a container hermetically sealed with acrylic or the like. Reference numeral 53 denotes a microwave waveguide, and one end of the waveguide 53 is disposed in the closed container 52. A lid 64 made of a material such as Teflon that transmits microwaves is hermetically sealed inside the waveguide 53 inside the waveguide 53 at the boundary between the atmosphere and the sealed container 52. ing. Waveguide 53 in the atmosphere 53a
The waveguide 53 in the closed container 52 is denoted by 53b.

Reference numeral 54 denotes a cylindrical hole formed for disposing the glass tube 10 in the waveguide 53b in the closed container 52. In a part around the hole 54 for lamp placement, there is a heat absorber 55 such as a silicon material for heating the glass of the side tube portion 12b and sealing the electrode assembly 13. The heat absorber 55 has a ring shape or a cylindrical shape. The heat absorber 55 is heated by the microwave, and generates high heat at its center. Reference numeral 56 denotes a heat insulating material such as an alumina material for improving the efficiency of the heat absorber 55. Insulation material 5
6 surrounds the heat absorber 55.

Reference numeral 57 denotes a chuck for fixing the glass tube 10. A motor (not shown) is attached to the chuck 57, and the glass tube 1 attached to the chuck 57 is
0 rotates in the circumferential direction of the glass tube 10 as indicated by a substantially arrow 60. Since the chuck 57 is provided so as to be able to move up and down by driving means (not shown), the chuck 5
The glass tube 10 attached to 7 can move up and down in the axial direction of the glass tube 10 as indicated by a substantially arrow 61.

Reference numeral 62 denotes a compressor for bringing the inside of the closed container 52 into a pressurized state at atmospheric pressure or higher. 63 is an adjusting valve for keeping the pressure in the closed container 52 constant.
The pressure inside the closed vessel can be arbitrarily set to the atmospheric pressure or pressurized by the adjusting valve 63.

The steps of the present embodiment configured as described above will be described. First, a process of heating the glass of the first portion of the side tube portion 12b where the electrode rod 20 is located and reducing the inner diameter of the glass of the side tube portion 12b where the electrode bar 20 is located to the vicinity of the electrode bar 20 is performed. Specifically, it is performed as follows.

The inside of the sealed container 52 is maintained at the atmospheric pressure. In this state, the glass tube 10 is attached to the chuck 57. That is, one end of the side tube portion 12b is fixed to the chuck 57 such that the axis of the side tube portion 12b and the axis of the heat absorber 55 match. Next, the position of the glass tube 10 is adjusted so that the heat absorber 55 faces the first portion of the side tube portion 12b. Subsequently, the glass tube 10 is rotated.

Next, a microwave is oscillated from the magnetron 50 to heat the heat absorber 55. Heated heat absorber 5
5 is a side tube portion 12b where the rotating electrode rod 20 is located.
Is heated above the softening point to reduce the inner diameter of the first portion to near the electrode rod 20. In this case, the closed container 52
While the inside is kept at atmospheric pressure, the inside of the glass tube becomes lower than atmospheric pressure, so as shown in the middle section on the right end of FIG.
The diameter of the glass tube is reduced uniformly around the electrode rod 20.

The heated side tube portion 12b is cooled to about room temperature. The cooling of the glass tube 10 may be performed in the sealing machine 52 or may be performed by taking it out of the sealed container 52.

Subsequently, by moving the chuck 57 holding the glass tube 10 downward, the heat absorber 55 is moved downward.
Is opposed to the second portion. Subsequently, the glass tube 10 is rotated, and the glass of the second portion of the side tube portion 12b where the metal foil 21 is located is heated. In addition, compressor 62
To pressurize the inside of the closed container 52 to the atmospheric pressure or higher (1-1 to 1).
0 atm). Thus, the second portion is hermetically sealed.

Thus, the electrode sealing on the side tube portion 12b side is completed. The electrode sealing on the side tube portion 12a side is performed in the same manner as on the 12b side.

In the second and third embodiments, the discharge lamp has been described as an example. However, the same applies to the method for hermetically sealing the electrode assembly of an incandescent lamp in glass.

[0057]

As described above, according to the present invention, there is no stress concentration in the gap between the electrode rod and the side tube glass where the electrode rod is located, and the metal foil has high adhesion. Therefore, it is possible to realize an excellent lamp having a high pressure resistance structure that is hard to crack.

[Brief description of the drawings]

FIG. 1 is a diagram comparing the configuration of a discharge lamp according to a first embodiment of the present invention with that of a conventional discharge lamp.

2A is an enlarged sectional view taken along a dashed line 6 in FIG. 3, and FIG. 2B is an enlarged sectional view taken along a dashed line 7 in FIG.

FIG. 3 is a diagram showing a configuration of a discharge lamp according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of an incandescent lamp according to a second embodiment of the present invention;

5A is an enlarged sectional view taken along a dashed line 210 in FIG. 4, and FIG. 5B is an enlarged sectional view taken along a dashed line 211 in FIG.

FIG. 6 is a diagram showing a method for manufacturing a discharge lamp according to a second embodiment of the present invention.

FIG. 7 is a diagram showing a method for manufacturing a discharge lamp according to a second embodiment of the present invention.

FIG. 8 is a diagram showing a method for manufacturing the discharge lamp according to the second embodiment of the present invention.

FIG. 9 is a diagram showing a method for manufacturing the discharge lamp according to the second embodiment of the present invention.

FIG. 10 is a diagram showing a method for manufacturing a discharge lamp according to Embodiment 3 of the present invention.

FIG. 11 is a diagram showing a configuration of a conventional discharge lamp.

FIG. 12 is a view showing a conventional method of manufacturing a discharge lamp (pinching sealing).

13 is an enlarged cross-sectional view taken along a dashed line 105 in FIG. 11;

FIG. 14 shows a conventional method of manufacturing a discharge lamp (pressure reduction sealing).
Figure showing

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light-emitting part 2 Side tube part 3 Electrode bar 4 Metal foil 5 External current introduction line 6 Line showing the sectional direction of FIG. 2 7 Line showing the sectional direction of FIG. 2 10 Glass tube 11 Light-emitting part 12 Side tube part 13 Electrode assembly REFERENCE SIGNS LIST 20 electrode rod 21 metal foil 22 current introduction wire 23 spring 30 burner 40 chuck 41 burner 42 substantially arrow indicating direction of rotation of glass tube 43 type 44 approximately arrow indicating direction of movement of type 50 magnetron 51 antenna 52 sealed container 53 waveguide 54 Cylindrical hole for disposing lamp 55 Heat absorber 56 Insulating material 57 Chuck 60 Substantially arrow indicating direction of rotation of glass tube 61 General arrow indicating direction of movement of glass tube 62 Compressor 63 Pressure regulating valve 64 Cover 200 Light emitting unit 201 Side tube part 202 Current introduction line 203 Metal foil 204 External current introduction line 210 Line 211 showing the sectional direction in FIG. 5 lines showing the cross-sectional direction

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Mamoru Takeda 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. In-company (72) Inventor Yoshitaka Kurimoto 1006 Kazuma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (16)

[Claims] 1. An electrode assembly comprising a current introduction line having a metal foil connected to one end in a tube formed of a light emitting portion glass and a side tube portion glass extending to the light emitting portion glass. A method for manufacturing a lamp, comprising: inserting the electrode assembly into the side tube glass so that the axis of the side tube glass and the axis of the electrode assembly substantially coincide with each other; and connecting the electrode assembly to the metal foil. A part of the current introduction line on the side not provided is arranged so as to be located in the light emitting portion, and the first tube in the side tube portion glass where the current introduction line is located
Heating the portion, compressing it at a first pressure, heating the second portion of the side tube glass where the metal foil is located, compressing it at a second pressure, and compressing the second portion at a second pressure higher than the first pressure.
A method for producing a lamp, wherein the pressure is higher. 2. The method according to claim 1, wherein the lamp is a discharge lamp. 3. The method according to claim 1, wherein the lamp is an incandescent lamp. 4. The method for manufacturing a lamp according to claim 1, wherein the pressure for compressing the first portion is 1 atm or less. 5. The method according to claim 1, wherein the inside of the pipe is maintained at a pressure lower than the atmospheric pressure.
Heating the portion substantially uniformly, reducing the diameter of the first portion by the pressure difference between the inside and outside of the tube, heating the second portion uniformly, and crushing the second portion by a mold. A method for manufacturing a lamp according to any one of claims 1 to 3. 6. The pipe is maintained at a sub-atmospheric pressure, the first portion is heated substantially uniformly, and a pressure difference between the inside and the outside of the pipe is used.
The first portion is reduced in diameter, and the periphery of the second portion is maintained at or above atmospheric pressure, the second portion is heated substantially uniformly, and the pressure difference between the inside and outside of the pipe causes the second portion to be heated. The method for manufacturing a lamp according to claim 1, wherein the diameter of the lamp is reduced. 7. The step of heating the side tube surrounding the electrode assembly is performed in an inert gas atmosphere inside the side tube to prevent oxidation of the electrode assembly. Item 7. The method for producing a lamp according to any one of Items 1 to 6. 8. The method according to claim 7, wherein the inert gas is argon gas. 9. The method according to claim 2, wherein the side tube portion is heated while being rotated in the circumferential direction so as to substantially uniformly heat the side tube portion glass on which the electrode assembly is located. A lamp manufacturing method according to any one of the above. 10. The heating device for heating the side tube portion rotates in a circumferential direction of the side tube portion to substantially uniformly heat the side tube portion glass on which the electrode assembly is located. The method for producing a lamp according to claim 2. 11. The method for manufacturing a lamp according to claim 2, wherein the heating body for heating the side tube glass on which the electrode assembly is located is a burner. 12. The method for manufacturing a lamp according to claim 2, wherein the heating body for heating the side tube glass on which the electrode assembly is located is a high-frequency dielectric heating body. 13. A light emitting portion made of glass, a side tube portion extending from the light emitting portion and made of glass, a part disposed in the light emitting portion, one end connected to a metal foil, and A current introduction line hermetically sealed in the portion, the cross-sectional shape of the gap between the current introduction line and the side tube glass in the first portion of the side tube glass where the current introduction line is located, A lamp having a shape substantially similar to a cross-sectional shape of the current introduction wire, and a second portion of the side tube glass on which the metal foil is located is compression-molded by a mold. 14. The lamp according to claim 13, wherein said lamp is a discharge lamp. 15. The lamp according to claim 13, wherein said lamp is an incandescent lamp. 16. A light emitting unit, wherein a part of the light emitting unit is disposed.
One end is connected to a metal foil, and has a current introduction line hermetically sealed to a side tube extending from the light emitting portion, and a gap between the current introduction line and the side tube has a transverse cross-sectional shape. A lamp having a smooth shape without a cutout portion where stress concentration occurs, and wherein the side tube portion where the metal foil is located is compression-molded by a molding die.