JP2000231879A - How to join glass and metal - Google Patents

Abstract

(57) [Problem] To provide a bonding method for bonding glass and metal by heating by laser light irradiation. SOLUTION: A sealing material 4 is arranged at an end of a neck portion 1a of a glass tube 1 so as to surround an electrode lead 2a protruding from the inside of the neck portion 1a to the outside.
And the electrode leads 2a are focused in a rectangular shape for heating. The sealing material 4 is melted by the irradiation of the laser light, flows into the gap between the neck portions 1a along the heated electrode leads 2a, and joins the electrode leads 2a and the neck portions 1a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining method for joining glass and metal including ceramics by irradiating a laser beam. More particularly, the present invention relates to a method for joining a metal lead drawn out of an electrode provided in a glass tube. The present invention relates to a method of joining glass and metal suitable for a manufacturing process of an illumination lamp for hermetically sealing the inside of a glass tube by joining the glass tube at a position where the glass tube is pulled out from the glass tube.

[0002]

2. Description of the Related Art In an illumination lamp, when an electrode lead connected to an electrode housed in a glass tube is pulled out of the glass tube, the electrode lead and the glass tube are joined to hermetically seal the inside of the glass tube, and at the same time, the electrode is sealed. It is necessary to fix the position of the lead. The electrode lead is a metal wire, and the following bonding method is used in an illumination lamp in order to perform bonding between different materials such as metal and glass.

FIG. 11 shows a first conventional method for bonding between an electrode lead and a glass tube in a manufacturing process of a small high-intensity discharge lamp. Electrode leads 2a and 2a, which are extensions of the electrodes 2 and 2, respectively, are inserted into neck portions 1a formed at both ends of the glass tube 1 and are fixed in position by being joined to the neck portions 1a. The inside of the glass tube 1 is hermetically sealed. In this joining method, as shown in the drawing, the electrode lead 2a of the neck portion 1a at the joining position is pulled out.
A sealing material 4 made of glass or ceramic is disposed, and is melted by a heater 61 to join the neck portion 1a and the electrode lead 2a.

FIG. 12 shows a second conventional method of bonding between an electrode lead and a glass tube in a manufacturing process of a small mercury discharge lamp. The central portion of a quartz glass tube 21 is formed into a spherical shape. A method is shown in which the quartz glass tube 21 is bonded to the electrode leads 48, 48 drawn out from the discharge electrodes 27, 27 arranged opposite to each other in the discharge part 28 via a molybdenum foil 47. The quartz glass tube 21 is melted by the flame of the oxyhydrogen burner 62 while the quartz glass tube 21 is being evacuated while being rotated, so that the molten portion shrinks due to the evacuation and the molybdenum foil 47 and the electrode leads 27a. By performing this on both sides of the discharge unit 28, the inside of the discharge unit 28 is hermetically sealed and the discharge electrode 27 is fixed at a predetermined position.

[0005]

In the above-mentioned prior art, in the joining method using heater heating, the neck 1a, the electrode lead 2a, and the sealing material 4 are heated to the same temperature.
It is difficult to perform fine control such as improving the wettability at the time of joining by concentrating heat on the sealing material 4, and there is a limit to the joining quality.

In the joining method using the oxyhydrogen burner 62, most of the heat from the oxyhydrogen burner 62 is dissipated in the air unnecessarily, and the flame continues to be generated during the operation, resulting in a large energy loss. There was a problem. Furthermore, since the water generated by the combustion remains in the quartz glass tube 21, it causes a blackening factor and limits the operating life of the illumination lamp.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional joining method. The present invention has been made to improve the wettability between joining members so that a stable joining state can be obtained. It is intended to provide a joining method.

[0008]

Means for Solving the Problems In order to achieve the above object, a method for bonding glass and metal according to the first invention of the present application is as follows.
A metal rod is inserted into the glass tube so that one end thereof protrudes from the glass tube, and a sealing material formed of opaque glass or ceramic is disposed at the projecting portion of the metal rod of the glass tube so as to surround the metal rod. The object to be joined was placed at a predetermined position, and a laser beam was irradiated so as to be focused on a predetermined portion of the sealing material and the metal rod, and the sealing material melted by the irradiation of the laser light was heated. By flowing into the gap between the metal rod and the glass tube to fill the gap,
It is characterized by joining between a glass tube and a metal rod.

According to the above joining method, the sealing material melted by the laser beam irradiation flows into the gap between the glass tube and the metal bar along the metal bar because the metal bar is heated by the laser beam irradiation. The gap between the metal bar and the glass tube is joined because the gap is filled with the sealing material that has flowed in.

Further, according to the method for joining glass and metal according to the second invention of the present application, a metal rod is inserted into a glass tube so that one end side protrudes from the glass tube, and the metal rod is inserted into a projecting portion of the metal rod of the glass tube. An object to be bonded having a sealing material formed of opaque glass or ceramic surrounding the metal rod is disposed at a predetermined position, and the first laser beam is focused on a predetermined portion of the sealing material and the metal rod. In addition to irradiating so as to emit light, irradiating so that a second laser beam having a wavelength having a high absorptivity to the glass tube is focused on a predetermined portion of the glass tube, and being melted by the irradiation of the first laser beam. The filled sealing material flows into the gap between the metal bar heated by the first laser beam and the glass tube heated by the second laser beam and fills the gap, so that the glass tube and the metal bar With Wherein the joining.

According to the above-mentioned joining method, the sealing material melted by the irradiation of the first laser beam is heated by the irradiation of the first laser beam on the metal rod, and the glass tube is heated by the second laser beam. By having, the wettability of the metal rod and the glass tube to the molten sealing material is improved,
The sealing material that has flowed into the gap between the glass tube and the metal rod surely adheres to both to fill the gap, and the glass and metal are joined.

Further, in the method for joining glass and metal according to the third invention of the present application, the joining portion of the article to be joined, in which a metal rod is inserted into a glass tube, is formed at a predetermined position by using a high melting point material. The metal rod is housed in a cylindrical body having an opening formed therein, arranged at a predetermined position, irradiated with laser light to the cylindrical body and heated, and formed of a metal rod by the laser light passing through the opening of the cylindrical body. Is heated, and a predetermined portion of the glass tube is softened by indirect heating by heating the cylindrical body and direct heating by heating of the metal rod, and a predetermined portion of the softened glass tube is pulled out of the cylindrical body by pulling out the workpiece. The method is characterized in that the glass tube and the metal bar are joined by applying pressure to the metal tube and bonding the softened glass tube to the heated metal bar.

According to the above joining method, the glass tube is effectively heated and softened from inside and outside by the cylindrical body and the metal rod heated by laser irradiation. When the glass tube is softened, the workpiece is pulled out of the cylindrical body and the softened glass tube is pressed from both sides. The softened glass tube adheres to the heated metal rod, and the glass and metal are joined. .

Further, in the method for bonding glass and metal according to the fourth invention of the present application, the first laser beam is bonded to a bonding portion of a workpiece in which a metal rod is inserted into a glass tube. By irradiating the part with heat and irradiating the second laser beam to the joint part of the glass tube and heating it, the joint part of the molten glass tube is adhered to the heated metal rod, so that the glass tube and the metal It is characterized by joining between a rod.

According to the above joining method, the metal rod is heated by the irradiation of the first laser beam, the glass tube is melted by the irradiation of the second laser beam, and the joined portion of the molten glass tube is heated by the heated metal rod. The metal and the glass are joined together with good wettability.

Further, in the method for joining glass and metal according to the fifth invention of the present application, the joining portion of the article to be joined formed by inserting a metal rod into a glass tube is formed of a high melting point material,
Along with forming a large number of openings at predetermined positions, housed in a cylindrical body formed by providing an opening in one direction surface, evacuated from the glass tube and arranged at a predetermined position,
The cylindrical body is heated by irradiating the cylindrical body with the laser beam, and the metal rod is heated by the laser beam having passed through the opening of the cylindrical body, and the second laser beam is bonded to the glass tube through the open section of the cylindrical body. The portion is heated by irradiating the portion, and the joint portion of the glass tube is melted by indirect heating by heating of the cylindrical body and direct heating by irradiation of the second laser beam, and the joined portion of the melted glass tube is evacuated by evacuation. The shrinkage causes the molten glass tube to adhere to the heated metal bar, thereby joining the glass tube and the metal bar.

According to the above-described joining method, the glass tube is heated from the inside and outside by the cylindrical body and the metal rod heated by the irradiation of the first laser beam, and is simultaneously heated by the irradiation of the second laser beam. It melts. The molten glass tube shrinks and adheres to the heated metal bar by being evacuated, so that the bonding between the glass and the metal is made.

In each of the above inventions, the object to be irradiated with the laser beam is irradiated with the laser beam having a wavelength at which the absorptivity of the laser beam is 2% or more. Thus, laser heating can be performed efficiently.

Further, by irradiating the object to be irradiated with the laser light with a laser light having a wavelength at which the absorptivity of the laser light is 2% or more and 80% or less, the glass tube can be heated more than necessary. Since it is avoided and the sealing member, the metal rod, and the cylindrical body are efficiently heated, the absorptance of the laser beam to the heated portion needs to be 2% or more, more preferably 2% to 80%. It is good to do.

In the joining method according to the third and fifth aspects of the present invention, the cylindrical body is formed of a material having a relatively large specific resistance, and a current is caused to flow through the cylindrical body to generate heat, thereby improving the efficiency of temperature rise of the glass tube. By doing so, the temperature rise of the cylindrical body is promoted, so that the heating of the glass tube is efficiently promoted.

In each of the joining methods described above, since the joint formed between the glass tube and the metal rod or the cylindrical body is covered with the chamber formed of the material that transmits the laser beam, the diffusion of heat is prevented. Efficiency is promoted.

Also, by rotating the object,
Since the heating state by laser light irradiation is uniform, there is no bias in the softening and melting state of the glass tube,
Further, adhesion of silica caused by a temperature difference is prevented.

Further, by irradiating the laser beam to the joining portion while changing the irradiation intensity of the laser beam with the passage of time, breakage of the sealing material and breakage of the glass tube due to rapid application of laser power can be prevented, and The desired heating state can be obtained by increasing the irradiation intensity as the state increases.

Further, by changing the irradiation intensity distribution at the laser beam irradiation site so as to irradiate the laser beam to the bonding site, it is possible to irradiate the laser beam intensively to the site requiring heating, thereby ensuring reliable irradiation. A good joining state can be obtained.

Further, a laser beam having a wavelength having a high absorptivity to the metal rod and the cylindrical body is output from a laser beam source configured by laminating a plurality of LD arrays in which a plurality of laser diodes are arranged in parallel. Then, while converting this laser light into parallel light, the light is focused by a focusing optical system that adjusts the focusing size and the aspect ratio at the irradiation position, and is irradiated in a rectangular shape corresponding to the shape and size of the bonding portion. Can be Since the laser light is emitted from the laser light source in a rectangular shape, the laser light is condensed into a shape and size corresponding to the joint by the condensing optical system. Can be done. In addition, since the laser light source by the LD array outputs laser light with high electric conversion efficiency, laser irradiation can be performed with energy saving.

In the above-mentioned joining method, the object to be joined in which the metal rod is inserted into the glass tube is connected to an illumination lamp formed by joining an electrode lead drawn from an electrode provided in the glass tube to the glass tube. Can be applied. According to this joining method, the electrode lead pulled out from the electrode provided in the glass tube of the illumination lamp is joined to the glass tube, and the inside of the glass tube is hermetically sealed and the position of the electrode lead is fixed.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention.
The embodiment described below is an example embodying the present invention, and does not limit the technical scope of the present invention.

First, in a small high-intensity discharge lamp, when an electrode lead connected to a discharge electrode provided in a glass tube is drawn out of the glass tube, the electrode lead is joined to the glass tube at the position where the electrode lead is drawn out. The joining method according to the first embodiment for hermetically sealing the inside of the glass tube and fixing the position of the electrode lead will be described.

As shown in FIG. 1B, in the small high-intensity discharge lamp, metal discharge electrodes 2 and 2 are arranged opposite to each other in a glass tube 1, and an extension of each of the discharge electrodes 2 and 2 is provided. The electrode leads 2a and 2a are drawn out of the glass tube 1. Each electrode lead 2a, 2a passes through the inside of the cylindrical tube of the neck portions 1a, 1a formed on both sides of the glass tube 1, and is drawn out to the outside, so that the metal of the electrode lead 2a and the neck portion 1a at this neck portion 1a. By bonding with glass, the inside of the glass tube 1 is hermetically sealed, and at the same time, the electrode lead 2a is fixed at a predetermined position. The bonding between the electrode lead 2a and the neck portion 1a is performed by a ring-shaped sealing provided at the end of the neck portion 1a so as to surround the electrode lead 2a protruding outside from the neck portion 1a as shown in the figure. This is performed by melting the material 4 by irradiating the laser beam and heating the electrode lead 2a.

The laser irradiating section 6 for irradiating the laser light includes an LD unit 11 as a laser light generating source, and a laser light condensing optical system 12.
The LD unit 11 is configured by stacking a plurality of LD arrays 10 in which a plurality of laser diodes (LD) are arranged in parallel. The condensing optical system 12 includes a lens array 14 that converts the laser light, which becomes the first axis light, output from each LD array 10 into parallel light by a cylindrical lens or a rod lens, and a laser beam 3 that is converted into the parallel light. It is provided with a first cylindrical lens 15 and a second cylindrical lens 16 for adjusting the vertical and horizontal widths Δd and Δf at the light condensing position. The first cylindrical lens 15
By changing the position in the optical axis direction, the width Δf of the rectangular converging shape can be adjusted. The width Δd of the rectangular converging shape can be adjusted by changing the position of the second cylindrical lens 16 in the optical axis direction. By disposing the heat ray cut cover 13 at the exit position of the laser light emitted from the light collecting optical system 12, the LD array 10 can be protected from heat rays.

As shown in FIG. 1B, the small high-intensity discharge lamp is supported by the rotation support means 20 with the neck 1a on the side to be hermetically sealed by bonding facing upward and the other neck 1a. The sealing material 4 is attached to the neck portion 1a at the position where the electrode lead 2a is pulled out. In this state, the laser light is irradiated from the laser irradiation unit 6 while the glass tube 1 is rotated at a predetermined speed by the rotation support means 20. Irradiation of the laser beam is performed by a rectangular laser beam 3 as shown in the figure.
Of the laser beam 3 corresponds to the diameter of the sealing material 4.
Is collected so that the center of the height Δf is below the sealing material 4. The laser light output from the LD unit 11 is
Since it has a wavelength of 600 to 960 nm and has good absorbability to the electrode lead 2a and the sealing material 4, the sealing material 4 made of translucent ceramic or glass solder absorbs the laser light by the irradiation of the laser light. The electrode leads 2a are also heated and melted by absorbing laser light. The molten sealing material 4 is, as shown in an enlarged view in FIG.
It flows into the gap between the heated electrode lead 2a and the neck part 1a by capillary action, and the neck part 1a and the electrode lead 2a
And airtightly seal the inside of the glass tube 1 by filling the gap.

In the above structure, the sealing material 4 can be melted more quickly by improving the absorption of laser light.
It is effective to make it colored, especially black. In the case where the encapsulant 4 is broken by rapid laser irradiation,
Output control according to the lapse of irradiation time, such as gradually increasing the laser light output or increasing the laser light output in the latter half of the irradiation time, and changing the distribution of the irradiation intensity of the laser light to optimize the bonding state Obtainable.

As shown in FIG. 3, a method of changing the distribution of the irradiation intensity of the laser beam irradiation is to dispose a transmission reflection plate 18 provided with a partial transmission coating along the optical path of the laser beam 3, and By adjusting the angle, the sealing material 4
Can change the distribution state of the irradiation intensity of the laser light applied to the substrate. That is, at the start of joining, the irradiation position is set to an angular position deviating from the laser beam 3, and the irradiation intensity is uniformly heated to the irradiation site, and the reflection angle is set to the reflection angle as shown in FIG. Thus, the irradiation intensity of the laser light to the sealing material 4 is increased. By controlling the irradiation power density, there is no rapid heating of the sealing material 4 and cracking of the sealing material 4 is prevented.
Further, the melting of the sealing material 4 is started at the timing when the electrode lead 2a is in a high temperature state, so that the sealing material 4 flows quickly along the electrode lead 2a.

As shown in FIG. 3, such control of the irradiation intensity distribution can also be adjusted by arranging a variable attenuator 19 by a deflection plate on the optical path of the laser beam 3 and rotating or moving it. it can. Also,
The irradiation intensity distribution can also be changed by the curvature multiple cylindrical lens 17 in which the curvature of the cylindrical lenses 15 and / or 16 is partially changed. In the configuration shown in FIG. 3, the irradiation intensity distribution with respect to the sealing material 4 can be changed by moving the curvature multiplex cylindrical lens 17.

Further, as shown in FIG. 4, a laser irradiation section 6a for intensively heating the sealing material 4 and a laser irradiation section 6b for intensively heating the electrode lead 2a can be provided. . The laser beam 3a from the laser irradiation unit 6a focuses on the sealing material 4 and melts the sealing material 4, and the laser beam 3b from the laser irradiation unit 6b flows inside the neck 1a of the electrode lead 2a. The electrode lead 2a is heated by focusing intensively on the portion. According to this configuration, each of the laser irradiation units 6a and 6b can be independently controlled, so that an optimal bonding state can be set.

Next, in the mercury discharge lamp, when the electrode lead of the discharge electrode disposed in the glass tube is drawn out of the glass tube, the electrode lead is joined to the glass tube at the position where the electrode lead is drawn, and the inside of the glass tube is evacuated. A joining method according to the second embodiment for hermetically sealing will be described.

The mercury discharge lamp according to this embodiment is shown in FIG.
As shown in (a) and (b), a spherical discharge portion 28 is formed at the center of the glass tube 21, and tungsten discharge electrodes 27, 27 are arranged in the discharge portion 28 to face each other. This discharge electrode 27 is connected to an electrode lead 48 via a molybdenum foil 47. The discharge unit 2 of this mercury discharge lamp
In order to hermetically seal the inside of the glass tube 8, a predetermined portion of the glass tube 21 is softened by heating by laser light irradiation, and the softened glass tube 21 is pressed so as to sandwich the molybdenum foil 47. Is filled with softened glass, and the discharge part 28 is hermetically sealed. Incidentally, the structure of the lead drawn out from the discharge electrode 27 is not necessarily the structure via the molybdenum foil 47, and the same structure can be applied to the case where only the rod-shaped electrode lead 48 is drawn out.

To seal the glass tube 21 by laser beam irradiation, a heating jig 26 configured as shown in a sectional view in FIG. 6 is used. This heating jig 26
The glass tube 21 is formed to have a diameter that can be freely inserted and removed,
A tungsten collar (cylindrical body) 24 having a number of openings formed below, and a discharge portion 28 covering the collar 24.
And a quartz glass tube (chamber) 23 formed to have a diameter capable of accommodating the same, and integrated together. The upper portion of the quartz glass tube 23 is closed, and an uneven state of temperature distribution due to air convection inside and The heat is not dissipated. Further, as shown in FIG.
Except for the laser beam incident position, heat ray reflection coatings 44 made of white ceramic or the like are applied to the outer peripheral surface of the, to prevent internal heat diffusion and improve the temperature rise efficiency of the collar 24.

FIG. 7 illustrates a processing method for sealing and joining a predetermined portion of the mercury discharge lamp 8 by using the heating jig 26. The processing method is illustrated in the heating jig 26 provided at a predetermined position. The mercury discharge lamp 8 held by the rotation holding means is inserted. Further, first and second laser irradiators 6a and 6b are arranged on both sides of the heating jig 26, and irradiate the laser beams 9a and 9b condensed on predetermined portions, respectively. The first and second laser irradiation units 6a, 6b
Has the same configuration as that shown in the first embodiment, and the same reference numerals are assigned and detailed description is omitted.

As shown in FIGS. 7A and 7B, the laser beam 9a emitted from the first laser irradiator 6a has a color with a short side width corresponding to the diameter of the glass tube 21 of the mercury discharge lamp 8. The light is condensed into a rectangle having a long side width corresponding to the height of the portion where the opening 24 is formed, and is irradiated toward the portion of the collar 24 where the opening is formed. This laser light passes through the quartz glass cylinder 23 of the heating jig 26 and is absorbed by the collar 24, passes through the opening, and is absorbed by the electrode lead 48 and the molybdenum foil 47. On the other hand, the laser beam 9b emitted from the second laser irradiation section 6b is
(A) As shown in (b), the light is condensed into a rectangle having a short side corresponding to the diameter of the collar 24 and a long side corresponding to the height of the portion where the opening is formed. Irradiation is directed to a site with This laser beam is applied to the heating jig 2
6 and is absorbed by the collar 24 and absorbed by the electrode lead 48 and the molybdenum foil 47. When the laser light is irradiated to the above state while rotating the mercury discharge lamp 8, the collar 24 is heated,
When the electrode leads 48 and the molybdenum foil 47 are heated, the glass tube 21 is indirectly heated by the heat of the collar 24 and is directly heated and softened by the heat of the internal electrode leads 48 and the molybdenum foil 47.

With the glass tube 21 softened, the mercury discharge lamp 8 is pulled out from the heating jig 26 and the glass tube 21 softened from both sides so as to sandwich the molybdenum foil 47 as shown in FIG. A predetermined part is pinched by a pair of pinching hands 30. Glass tube 2 softened by this pinching pressure
Numeral 1 seals the space inside the glass tube 21 by sandwiching the molybdenum foil 47 and the electrode lead 48 therebetween. By performing the soft sealing of the glass tube 21 on both sides of the discharge unit 28, the discharge unit 28 is hermetically sealed.

In the above configuration, the collar 24 is disposed in the quartz glass tube 23 whose upper part is sealed, and the heat ray reflection coat 44 is applied to the quartz glass tube 23 except for the position where the laser beam is incident.
, The heat generated by the collar 24 is sealed in the quartz glass tube 23, and the temperature rise efficiency is improved. In addition, by passing a current through the collar 24, the heat generation efficiency of tungsten as a resistor is improved, so that the processing efficiency during mass production can be improved. Further, the number of laser irradiation units 6 can be increased to improve the heating efficiency.

Next, a third electrode for joining the electrode lead drawn out from the electrode arranged in the glass ball to the glass ball at a pull-out position provided in one direction of the glass ball and hermetically sealing the inside of the glass ball. An embodiment will be described.

In FIG. 8, an incandescent lamp 29 has an electrode 34 configured as an incandescent wire disposed inside a bulb-shaped glass bulb 33, and electrode leads 35, 35 drawn out from both ends thereof.
Is held by a glass lead holding block 36, and is drawn out from a cylindrical portion 33a that is open to the outside in one direction of the glass sphere. In the cylindrical portion 33a, the inside of the glass bulb 33 is hermetically sealed by joining the glass of the cylindrical portion 33a and the lead holding block 36. This joining is performed by laser light irradiation as shown in FIG.

The cylindrical portion 33a is irradiated with an LD laser beam 31a from the LD laser irradiating portion 31 so as to be condensed by the cylindrical portion 33a, and is condensed from the CO ₂ laser irradiating portion 32 by the cylindrical portion 33a. Is irradiated with the CO ₂ laser beam 32a as described above. The LD laser light 31a has a wavelength of 600 to 960 nm, a normal metal is absorbed at an absorption rate of several tens%, and a colored glass or a colored ceramic is 10%.
%, But the absorption in transparent glass and transparent ceramic is almost zero. On the other hand, the CO ₂ laser beam 32a has a wavelength of 10.6 μm, is almost absorbed by glass or ceramic, and has an absorptivity of several percent in metal. Therefore, the LD laser beam 31a and CO ₂
The temperature of the electrode lead 35 of the cylindrical portion 33a where the laser beam 32a is condensed rises due to the irradiation of the LD laser beam 31a, and the glass of the cylindrical portion 33a and the lead holding block 3
6 is melted by the temperature rise due to the irradiation of the CO ₂ laser beam 32a. Due to this temperature rise, the bonding interface temperature rises and the glass and the glass are joined by melting of the glass, and the inside of the glass bulb 33 is hermetically sealed.

A fourth embodiment will be described below as a fourth embodiment in which the joining method using both the LD laser beam and the CO ₂ laser beam is applied to the sealing joining of a small high-intensity discharge lamp.

In FIG. 9, a small high-intensity discharge lamp is placed in a heating cylinder 22 in which a ZnSe plate 38 made of ZnSe (zinc selenium) is attached at a position where one circumferential surface of a quartz glass tube 37 is cut off in the cylinder axis direction. The sealing material 4 is arranged and inserted into one of the necks 1a of the base 7 and is provided at a predetermined position while being supported by the rotation supporting means 20 at the other neck 1a. As shown in the figure, the LD laser irradiator 6 and the CO ₂ laser irradiator 41 are disposed on both sides of the small high-intensity discharge lamp 7 as a center.

LD emitted from LD laser irradiation unit 6
The laser beam 50 passes through the quartz glass tube 37 and is condensed into a rectangle having the width of the electrode lead 2 a and the height including the sealing material 4.

The CO ₂ laser beam 51 emitted from the CO ₂ laser irradiation section 41 is transformed into an oblong shape by the ZnSe lens 42, and the neck 1 a including the sealing material 4 is formed.
Is irradiated.

The LD laser light 50 is applied to the quartz glass tube 3
7, the sealing material 4 and the electrode lead 2a are heated, and the sealing material 4 is melted. The CO ₂ laser light 51 is Zn
Through the Se plate 38, the quartz glass portion of the neck 1a and the sealing material 4 are effectively heated. At this time, the heating cylinder 22 constituted by the quartz glass tube 37 and the ZnSe plate 38 forms a convection prevention cover to prevent heat from being radiated to the outside. The efficiency of temperature rise can be improved. Due to this heating, the molten sealing material 4 smoothly flows into the gap between the electrode lead 2a and the neck 1a whose temperature has risen and fills the gap.
a to hermetically seal the inside of the glass tube 1.

In the above configuration, the heating tube 22 is constituted by the quartz glass tube 37 and the ZnSe plate 38, but may be formed in a cylindrical shape only by ZnSe, and ZnSe almost transmits the wavelength of the LD laser light. Therefore, there is no difference in the heating effect. Although the effect of the heating cylinder 22 is somewhat reduced, the joining effect can be obtained without particularly using the heating cylinder. Further, the LD laser irradiation portion 6 and the CO ₂ laser irradiation part 41, when arranged on both sides of a straight line is, assuming that the CO ₂ laser light is absorbed by the neck portion 1a, CO ₂ laser light L
It is desirable to set the irradiation directions of both at a predetermined angle so as not to hit the D laser irradiation unit 40.

Next, a fifth embodiment will be described as an example in which the bonding method using both the LD laser light and the CO ₂ laser light is applied to sealing bonding of a mercury discharge lamp.

In FIG. 10 (a), one direction is axially cut out and opened, a tungsten collar 45 having a number of openings formed below, and a ZnSe tube 4 covering the collar 45.
The glass tube 21 of the mercury discharge lamp 8 is inserted into a heating tube 25 having a double structure of the structure 6 and is disposed at a predetermined position. The mercury discharge lamp 8 is fed from the LD laser irradiation unit 6 to the LD.
The laser light 54 is irradiated in the form of a rectangular condensed spot having a width corresponding to the diameter of the collar 45 and the height of the opening forming portion of the collar 45. The irradiation of the LD laser light 54 heats the collar 45, and at the same time, the color 4
The molybdenum foil 47 and the electrode leads 48 are heated by the laser light passing through the opening 5. In addition, the laser light emitted from the CO ₂ laser
Oval CO ₂ laser beam 55 by lens 42
Through the opening of the collar 45
Irradiation. The glass tube 21 is irradiated with the laser light.
Is directly heated, and at the same time, is melted by indirect heating by the heated collar 45. The mercury discharge lamp 8 is rotated at a predetermined speed by a rotation holding means (not shown), so that the irradiated portion of the laser beam is uniformly heated over the entire circumference, and the glass tube 21 is melted by being evacuated from the glass tube 21. When the heating cylinder 25 is moved upward from above the glass tube 21 at the above timing, the melted portion contracts and adheres to the heated molybdenum foil 47 and the electrode lead 48 to hermetically seal the inside of the discharge portion 28.

In the above configuration, the CO ₂ laser irradiating section 53 has a large component, so that the laser beam emitted from the CO ₂ laser irradiating section 53 is converted into a horizontal direction by reflecting the laser beam emitted from the mirror 49 in a vertical direction. Can be reduced in installation area.

Further, even if the heating tube 25 is eliminated according to the intensity of the laser beam, it is possible to perform heating for sealing and joining.

[0056]

As described above, according to the present invention, a laser beam can be focused on a predetermined portion and heated, so that a desired portion can be intensively heated to join the glass and metal. It can be carried out. Further, laser light can be focused on a minute irradiation point, and can be applied to bonding for hermetic sealing in a small illumination lamp.

[Brief description of the drawings]

FIGS. 1A and 1B are a plan view and a side view showing a configuration for implementing a bonding method according to a first embodiment. FIGS.

FIG. 2 is an enlarged sectional view showing a joined state.

FIG. 3A is a plan view and FIG. 3B is a side view showing a method of adjusting the irradiation intensity distribution in the above configuration.

4A and 4B are a plan view and a side view showing a bonding method in which a plurality of laser irradiation units are provided.

FIG. 5 is a sectional view showing a configuration of a mercury discharge lamp.

FIGS. 6A and 6B show a configuration of a heating jig used in the bonding method according to the second embodiment, wherein FIG. 6A is a longitudinal sectional view, and FIG. 6B is a sectional view taken along line AA.

7A is a side view, FIG. 7B is a plan view, and FIG. 7C is a cross-sectional view showing a pressurized state, showing a bonding method according to the second embodiment.

FIG. 8 is a schematic view illustrating a bonding method according to a third embodiment.

FIGS. 9A and 9B are a plan view and a side view showing a bonding method according to a fourth embodiment.

FIG. 10 shows a joining method according to a fifth embodiment (a).
Is a plan view, and (b) is a side view.

FIG. 11 is a schematic view showing a first joining method according to the related art.

FIG. 12 is a schematic view showing a second bonding method according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 21 Glass tube 2a, 48 Electrode lead (metal rod) 4 Sealing material 6 Laser irradiation part 11 LD unit (laser light generation source) 12 Condensing optical system 22, 25 Heating cylinder (chamber) 24 Color (cylindrical body) ) 26 Heating jig (chamber)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tatsuya Kawamura 1-1, Sachimachi, Takatsuki-shi, Osaka Matsushita Electronics Corporation Inside (72) Takeshi Takeshi 1-1, Sachimachi, Takatsuki-shi, Osaka Matsushita Electronics Incorporated (72) Inventor Sozo Sakoda 1-1, Kochicho, Takatsuki-shi, Osaka Matsushita Electronics Co., Ltd. F-term (reference) 5C012 JJ03 5C043 AA13 AA17 AA19 CC01 CD05 DD12 DD20 EA19 EC20

Claims (14)

[Claims] A metal rod is inserted into a glass tube so that one end of the glass tube protrudes from the glass tube, and a sealing member formed of opaque glass or ceramic so as to surround the metal bar at a projecting portion of the metal rod of the glass tube. An object to be joined having a stopper material disposed at a predetermined position, and a laser beam is irradiated so as to be focused on a predetermined portion of the sealing material and the metal rod, and the sealing material melted by the laser light irradiation Joining the glass tube and the metal rod by flowing into and filling the gap between the heated metal rod and the glass tube. A metal rod is inserted into the glass tube so that one end of the glass tube protrudes from the glass tube, and a sealing member formed of opaque glass or ceramic so as to surround the metal bar at a protruding portion of the metal rod of the glass tube. The workpiece on which the stopper is disposed is disposed at a predetermined position, and the first laser beam is irradiated so as to be focused on a predetermined portion of the sealing member and the metal rod, and the second laser beam is irradiated with glass. Irradiation is performed so as to be focused on a predetermined portion of the tube, and the sealing material melted by the irradiation of the first laser light is combined with a metal rod heated by the first laser light and a second material.
A method of joining a glass tube and a metal rod by flowing into a gap between the glass tube heated by the laser light and filling the gap, thereby joining the glass tube and the metal rod. 3. A joint portion of an object to be joined, in which a metal rod is inserted into a glass tube, is housed in a cylindrical body formed of a high melting point material and having a large number of openings at predetermined positions. And heating the metal rod by irradiating the cylindrical body with the laser light, heating the metal rod by the laser light passing through the opening of the cylindrical body, indirect heating by heating the cylindrical body, and heating the metal rod. Direct heating by heating softens a predetermined part of the glass tube, pulls out the workpiece from the tubular body, presses the predetermined part of the softened glass tube from both sides, and bonds the softened glass tube to the heated metal rod A method of joining a glass and a metal, wherein the joining is performed between the glass tube and the metal rod. 4. A first laser beam is radiated to a joint portion of an object to be joined in which a metal rod is inserted into a transparent glass tube so that the laser beam is focused on the joint portion of the metal rod, and a second laser beam is irradiated. The laser beam is irradiated so as to be focused on the joint portion of the glass tube, and the joint portion of the glass tube melted by the irradiation of the second laser beam is applied to the metal rod heated by the irradiation of the first laser beam. A method for joining glass and metal, wherein the glass tube and the metal rod are joined by bonding. 5. A joining portion of an object to be joined, in which a metal rod is inserted into a transparent glass tube, is formed of a high melting point material, has a number of openings at predetermined positions, and has openings in one direction. Housed in a cylindrical body formed by providing
A vacuum is drawn from the inside of the glass tube, the tube is placed at a predetermined position, a first laser beam is applied to the tubular body to heat it, and the metal rod is heated by the laser beam passing through the opening of the tubular body. Irradiating the joint portion of the glass tube with the second laser beam through the open portion of the tubular body to heat the glass tube, and heating the tubular body by indirect heating by heating the tubular body and direct heating by irradiating the second laser beam; Is melted, and the melted glass tube is bonded to the heated metal rod by the shrinkage of the melted glass tube by vacuum evacuation, thereby joining the glass tube and the metal rod. A method of joining glass and metal, characterized in that: 6. The glass according to any one of claims 1 to 5, wherein the object to be irradiated with the laser light is irradiated with a laser light having a wavelength at which the absorptivity of the laser light is 2% or more. How to join with metal. 7. The method according to claim 1, wherein the object to be irradiated with the laser light is irradiated with a laser light having a wavelength at which the absorptivity of the laser light is 2% or more and 80% or less. Method of joining glass and metal. 8. The cylindrical body is made of a material having a relatively large specific resistance, and a current is caused to flow through the cylindrical body to generate heat, thereby improving the temperature rise efficiency of the glass tube.
Or the bonding method of glass and metal according to 5. 9. The heat diffusion is prevented by covering a joining portion or a cylindrical body between a glass tube and a metal rod with a chamber formed of a material that transmits laser light. Method of joining glass and metal. 10. The method for bonding glass and metal according to claim 1, wherein the object to be bonded is rotated to make the heating state by laser beam irradiation uniform. 11. The bonding method of glass and metal according to claim 1, wherein the laser light is irradiated to the bonding portion by changing the irradiation intensity of the laser light with the passage of time. 12. The bonding method of glass and metal according to claim 1, wherein the laser light is irradiated to the bonding part by changing the irradiation intensity distribution at the laser light irradiation part. 13. A laser beam having a wavelength highly absorptive to a metal rod and a cylindrical body is output from a laser beam source configured by laminating a plurality of LD arrays each having a plurality of laser diodes arranged in parallel. Is, while converting this laser light into parallel light, focused by a focusing optical system that adjusts the focused size and aspect ratio at the irradiation position,
The method for joining glass and metal according to any one of claims 1 to 12, wherein the irradiation is performed in a rectangular shape corresponding to the shape and size of the joining portion. 14. A lighting lamp formed by joining an electrode lead drawn out from an electrode provided in a glass tube to the glass tube, wherein the object to be joined having a metal rod inserted into the glass tube is formed. 14. The method for bonding glass and metal according to any one of 1 to 13.