JPS6217943A - Manufacture of lamp bulb - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method of manufacturing a light bulb.

[Conventional technology]

In general, a light bulb is used as a light source for exposure in a copying machine or as a heat source for fixing.
It is also widely used as a light source for other lighting purposes.

In an example of a conventional light bulb manufacturing method, as shown in FIG. 10, internal lead rods 11.
11, one end of a metal foil 12.12 made of molybdenum or the like is connected to the internal lead rods 11, 11, external lead rods 13, 13 are connected to the other end of this metal foil 12.12, and the power supply member is connected. One filament assembly 1 is formed, and the 11th filament assembly 1 is formed.
As shown in the figure, a cylindrical glass tube 2 having a protruding tube 21 for evacuation and introduction of sealed substances in the center is held vertically by a holder 3, and the glass tube 2 is held vertically by a holder 3. Extending along the tube axis and external lead rod 13.13
The filament assembly 1 is positioned so that it projects from the ends 22, 22 of the glass tube 2, respectively.

4 is a holder that holds the upper external lead rod 13 under pressure, and 5 is a support base that supports the lower external lead rod 13.

In this state, a protective gas made of nitrogen, argon, etc. is injected from the protruding tube 21 of the glass tube 2 into the interior of the glass tube 2, for example, at a rate of 0.5 to 27 cm. While flowing at a flow rate of /min,
The lower end 22 of the glass tube 2 is heated from the outside with a heater 6 such as a gas burner to melt it, and in this state, as shown in FIG. The metal foil 12 located within the end portion 22 is hermetically welded to the glass portion of the end portion 22 by pressing with the surface to form one sealing portion. Next, the glass tube 2 with one end sealed in this manner is held in the opposite direction, and the other sealed portion is formed in the same manner as described above. Then, the inside of the glass tube 2 is evacuated through the protruding tube 21, and then a necessary sealed substance is introduced into the inside of the glass tube 2 via the protruding tube 21. Thereafter, the protruding tube 21 is heated and hermetically closed to obtain a light bulb as shown in FIG. 21A indicates the remaining protruding portion of the protruding tube 21. As shown in FIG.

[Problem that the invention seeks to solve]

However, in such a method, even if the protrusion tube 21 is finally sealed airtight and the protrusion portion 21A is removed to be as short as possible, the protrusion portion 21A can be removed without any adverse effect on the glass portion around the protrusion tube 21. It is quite difficult to completely remove the protruding portion 21A of about 2 to 5 fi. Therefore, a protruding portion 21A is inevitably formed on the outer wall of the glass tube 2 of the light bulb obtained by the above method due to the glass portion of the protruding tube 21.
For this reason, the protruding portion 21A may become an obstacle when attaching the light bulb to other equipment and may have an adverse effect. For example, when used as a heat source for fusing in a copying machine, the light bulb is usually attached inside the fixing roller. The light bulb is installed and removed through the light bulb insertion slot provided on the side of the fixing roller, but it is better to keep the size of this light bulb insertion slot as small as possible in order to prevent heat loss from the fixing roller. Since the light bulb has a protruding portion 21A, a light bulb insertion slot is required that is the size of the outer diameter of the bulb plus the length of the protruding portion 21A, which is an extremely large drawback from the perspective of preventing heat loss from the fixing roller. It has become. On the other hand, when the light bulb obtained by the above-mentioned method is used as an exposure light source for a copying machine, it is necessary that the light bulb obtains a predetermined light distribution. As a result, the direction of light is disturbed and a predetermined light distribution may not be obtained, which is a major problem. Since most of the protruding tube 21 is removed and ultimately becomes unnecessary, the cost of materials for this unnecessary glass portion is so large that it cannot be ignored, and this is also a cause of high manufacturing costs.

[Purpose of the invention]

The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is to enable evacuation and introduction of a sealed substance without providing a protruding tube for exhausting or introducing a sealed substance on the outer wall of a glass tube. To provide a method for manufacturing a light bulb, which can economically produce the light bulb, and furthermore, can easily and reliably hermetically seal a glass tube.

[Means for solving problems]

The method for manufacturing the light bulb of the present invention uses a glass tube having a tube section for surrounding a light emitting section and a tube section for a sealing section, and a power supply member is placed inside the tube section for the sealing section of the glass tube, with a part of the power supply member being connected to the sealing section. The power supply member is positioned so as to protrude from the glass tube portion, and the power supply member is hermetically welded by heating and pressing the sealing tube portion of the glass tube so that a pore communicating with the inside and outside of the glass tube remains in a part thereof. , comprising the step of evacuating the glass tube and introducing the enclosed substance through the pore, and then heating the glass surrounding the pore with a laser beam that vibrably slightly displaces the pore to close the pore. do.

[Effect]

According to this method, when the power supply member is hermetically welded into the tube for the sealing part of the glass tube, a pore is left in a part thereof that communicates with the inside and outside of the glass tube, and this pore is used to perform exhaust and Since the encapsulated substance is introduced, the evacuation and introduction of the encapsulated substance can be carried out without providing a protruding pipe for evacuation or introduction of the encapsulated substance. Moreover, since a laser beam with small vibrational displacement is used as a heating source to close the pores,
The laser beam is not concentrated in one place on the glass surrounding the pore, and therefore hermetic sealing with less distortion is achieved compared to when the laser beam is concentrated in one place without causing minute vibrational displacement. can be achieved.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings. The following embodiment is an example of manufacturing a long double-end type light bulb, that is, a type with both ends sealed, which is used, for example, as a light source for exposure or a heat source for fixing.

In this embodiment, as shown in FIG. 1, the center part is a tube part for surrounding the light emitting part, and the both sides are pipe parts for a sealing part. A long cylindrical glass tube 7 is used, and this glass tube 7 is held vertically by a holder 3 in which a gas introduction tube 31 is provided in a part of the glass tube 7. External lead rods 13.13 extending along the axis and at both ends protrude from the sealing tube portions 71A, 71B of the glass tube 7, and metal foils 12.12 respectively extend from the sealing tube portions 71A, 71B.
A power supply member, for example, the filament assembly 1 having the same configuration as that shown in FIG. 8, is positioned within 71B. 4 is a holder that holds the upper external lead rod 13 under pressure, and 5 is a support base that supports the lower external lead rod 13. In this state, nitrogen is introduced from the gas introduction tube 31 toward the lower part of the glass tube 7 from the opening of the sealing tube section 71B above the glass tube 7.

Protective gas such as argon, for example, 0.5 to 2j!
While flowing at a flow rate of /min, the lower sealing tube section 71A of the glass tube 7 is heated from the outside with a heater 6 such as a gas burner to melt it, and in this state, the sealing tube section 71A is heated and melted. As shown in FIG. 2, from the outer wall surface of the glass tube 71, press the central part of the sealing tube part 71 with pinchers 81 whose horizontal width of the pressing surface is smaller than the outer diameter of the glass tube 7. As a result, as shown in FIG. 3, the metal foil 12 of the filament assembly 1 is exposed from the inside of the glass tube 7 on both sides 73 and 73 extending in the vertical direction, which are not in contact with the pressing surface of the pincher 81. A flat airtight welded portion 72 is formed so that pores 74 and 74 penetrating outward of the sealing tube portion 71A remain. Next, as shown in FIG. 4, the glass tube 7 and the filament assembly 1 with one end fixed thereto are reversed, the glass tube 7 is held vertically by the holder 3, and the external lead rod 13 is placed below. is supported by the support stand 5, the filament assembly 1 extends vertically along the tube axis, the lower metal foil 12 is located in the lower sealing tube section 71B, and the external lead rod 13 is sealed. 71B. In this state, the gas introduction tubes 31 and 31 are connected to the openings of the pores 74 and 74 formed in the upper sealing tube section 71A, respectively, and the glass tube 7 is protected with nitrogen, argon, etc. While flowing the gas at a flow rate of, for example, 0.5 to 217 m1, the glass tube 7
The lower sealing tube part 71B is heated from the outside with a heater 6 such as a gas burner to melt it, and in this state, from the outer wall surface of the sealing tube part 71B, as shown in FIG. , the entire sealing portion tube portion 71B is pressed with a pincher 82 whose pressing surface has a width in the horizontal direction that is equal to or larger than the outer diameter of the glass tube 7, and the sealing portion tube portion 7 is pressed.
The metal foil 12 located within 1B is hermetically welded to the glass portion of the sealing tube portion 71B, and the entire glass portion is hermetically welded to completely hermetically seal the sealing tube portion 71B. .

Next, as shown in FIG. At least a portion of each of the tubes 74 is covered halfway so that it can be seen through from the outside, and is airtightly held in the head 100 for evacuation and introduction of an encapsulated substance.

101 is a stopper that also serves as a current-carrying electrode, 102 is an outer frame of the ventilation hole, 103 is a rubber square ring, 104, 105
is a spacer, 106 is a compression fitting, the external lead rod 13 is inserted into the stopper 101 in the sealing tube section 71A of the glass tube 7, and the openings of the pores 74 and 74 are connected to the ventilation holes 107, respectively. The square ring 103 contacts the entire periphery of the sealing tube portion 71 and is compressed in the axial direction of the glass tube 7 by the compression fitting 106 to maintain airtightness between the ventilation hole 107 and the external space. In this state, the inside of the glass tube 7 is evacuated via the ventilation hole 107 and the pores 74, 74 of the glass tube 7 using an air pump (not shown) or the like, and then, for example, halogen, nitrogen, argon, krypton, An inert substance such as xenon or an encapsulating substance such as a metallic substance is introduced into the glass tube 7 through the pores 74, 74.

Next, as a heating source, for example, the output is 100 to 500.
A laser oscillator 9 that generates a laser beam such as a carbon dioxide laser of about W is used, and the laser beam from the laser oscillator 9 is focused by an optical system 90 so that it becomes a small beam with a diameter of about 0.3 to 5.0 ml. For example, while vibratingly displacing the plane reflecting mirror 91, the small-diameter beam is moved to one side so that the small-diameter beam vibrably displaces minutely within the heated area of the glass surrounding the one pore 74. The heated area of the glass surrounding the pore 74 is heated and melted to completely close the void in at least a portion of the pore 74, for example, a portion with a length of about 1.5 to 5.0 +n, and then The surrounding glass of the other pore 74 is set at the irradiation position by, for example, rotating the head 100 for evacuation and inclusion substance introduction by 180 degrees, and the gap in the other pore 74 is similarly closed, thereby sealing the area. The tube section 71A is finally completely hermetically sealed to obtain a light bulb as shown in FIG.

In FIG. 6, 92 is a shutter, 93 is a shutter drive mechanism, 94 is a condensing lens, and 95 is a flat reflecting mirror 91.
A driving mechanism 96 is a position detection mechanism for detecting the position of the glass tube 7 with respect to the end 100 for evacuation and introduction of the enclosed substance. Drive mechanism 9
5 is constituted by a mechanism that generates electrical vibrations using an electromagnet or a crystal oscillator, or mechanical vibrations using a cam, for example, and this drive mechanism 95 causes the position of the flat reflecting mirror 91 to be minutely displaced in a vibrational manner at high speed. Thereby, the small diameter beam of the laser beam can be vibrated and minutely displaced within the heated region of the glass surrounding the pore 74. In this vibrational minute displacement, it is preferable that the small diameter beam of the laser beam is moved uniformly and evenly at high speed within the heated region of the glass surrounding the pore 74. The direction of the small diameter vibrational displacement within the heated region of the small diameter beam is not particularly limited, but for example, by appropriately selecting the moving speed of the small diameter beam in the vertical direction and the horizontal direction, which are perpendicular to each other, a variety of small displacements can be realized. can do.

In the above, the inner diameter of the pore 74 is, for example, 0.5 to 1.21.
It is preferable to set it to about 1. That is, from the point of view of workability in closing the pores 74, the smaller the inner diameter of the pores 74, the better;
．． If the inner diameter is less than 5 W, it is undesirable because it takes too much time to exhaust and introduce the enclosed substance.On the other hand, if the inner diameter is large, the time required to exhaust and introduce the enclosed substance will be shortened, but the work of blocking the pores 74 will be required. In some cases, it may not be possible to achieve an airtight seal.

According to the above embodiment, the tube part 71 for the sealing part of the glass tube 7
When forming the airtight welded part 72 on A, a pore 74.74 is provided in a part of it, and later the exhaust and the introduction of the enclosed substance are carried out through this pore 74. Since the evacuation and the introduction of the sealed substance can be carried out without providing a protruding tube, there is no need for a portion that will eventually become unnecessary and be removed as the glass tube 7, so material costs can be reduced. As a result, manufacturing costs are reduced by approximately 5% compared to conventional light bulbs with the same length, tube outer diameter, and wall thickness.
It is possible to manufacture the light bulb extremely economically.

The pores 74, 74 are hermetically sealed using a laser beam, and this laser beam is in the form of a small diameter beam focused by an optical system, and this small diameter beam is transmitted to the glass surrounding the pore 74. Because the beam is applied to the surrounding glass while being vibrated and vibrated within the heating area, there is no flame fluctuation or instability that occurs with gas burners, and the required melting energy is reduced with a small output. Therefore, only a specific small area can be melted accurately, easily and quickly, and hermetic sealing can be performed efficiently. Moreover, since the small diameter beam is not concentrated in one place, If a small-diameter beam is concentrated in one place and hermetically sealed without causing minute vibrational displacement, the temperature at that point will rise rapidly, so distortion is likely to occur, and such distortion can be suppressed to a small level. As a result, it is possible to reliably prevent the occurrence of premature cranking in the hermetically sealed portion of the pore, and the pore can be hermetically sealed extremely well.

Furthermore, since there is no protruding part caused by the protruding tube on the outer wall surface of the glass tube 7, the installation of the light bulb into other equipment eliminates the problem that conventionally occurs due to the protruding part. For example, when installing a light bulb inside the fuser roller of a copying machine, the size of the light bulb insertion opening on the side of the fuser roller can be made as small as the outer diameter of the glass tube 7, and the fuser roller This can greatly contribute to preventing heat loss. Furthermore, since there is no protruding part on the outer wall of the glass tube 7, it is possible to prevent the light distribution from being disturbed. For example, when used as an exposure light source for a copying machine, it is possible to reliably obtain the required light distribution. It becomes possible.

According to the method described above, the formation of pores 74.74 is
This can be done by determining the size of the pressing surface of the pincher 81 and the distance between the pressing surfaces during pressing, so there is no need for any other special means to form the pores 74, 74, and it is extremely simple. Pores 74.74 can be formed.

Although the present invention has been described above based on one embodiment, the present invention is not limited to the above embodiment and can be modified as appropriate.

For example, it is not necessarily necessary to form two pores; for example, one or three or more pores may be formed. For example, the pores can be made after completely hermetically sealing one end of the glass tube.
It may be formed at the other end.

If two or more pores are to be sealed with a laser beam, they may be hermetically sealed one by one as in the above-mentioned embodiment, or the laser oscillator 9 and optical system 90 may be used as in the above-described embodiment. It is also possible to provide a number corresponding to the number of pores so that all the pores are hermetically sealed at the same time. Alternatively, one laser oscillator 9 can be created by appropriately changing the optical system.
The laser beam is divided into two or more parts, and each of the divided laser beams is made into a small diameter beam as described above, and each of these small diameter beams is applied to the glass surrounding the pores to simultaneously aerate all the pores. It may be sealed, and in this case, only one laser oscillator is required, which is extremely economical.

In addition to the above-mentioned examples, specific means for forming pores include, for example, preparing a separate glass tube and communicating this glass tube inside and outside the glass tube within the end of the glass tube. In such a position, the end portion of the glass tube may be airtightly welded so as not to block the inside of the glass tube, thereby creating a pore formed by the glass tube.

The specific structure of the light bulb to which the present invention can be applied is not particularly limited; for example, it may be either a discharge lamp or an incandescent light bulb, and may be either a single-end type or a double-end type, Alternatively, it may be either a high-voltage bulb or a low-voltage bulb. The use of the light bulb to which the present invention can be applied is not particularly limited, and light bulbs used as light sources for exposure, heat sources for fixing, light sources for projectors, etc. can be manufactured according to the present invention.

FIGS. 12 and 13 are explanatory diagrams showing another embodiment of the present invention, and the light bulb of this example is used, for example, for a projector. In the figure, 200 is a glass tube, 201 is a filament assembly called a planar type, 202 is a metal foil, and 203 is a pore.
03, 203, and a pore 203 is also formed between the metal foils 202 and 202, and the airtight welded portion 2
04 is airtightly held in the head 300 for evacuation and introduction of an encapsulated substance in a state where it is covered halfway, and after exhausting the air and introducing the encapsulated substance, the glass surrounding the pores 203, 203, and 203 is vibrated minutely. The pores 203, 203, 203 are closed and hermetically sealed by heating with a displacing laser beam, thereby obtaining a light bulb for a projector.

〔Effect of the invention〕

As explained above, according to the present invention, when the power supply member is hermetically welded into the tube for the sealing part of the glass tube, a pore is left in a part thereof that communicates with the inside and outside of the glass tube, and this pore is utilized. Since the evacuation and the introduction of the encapsulated substance are carried out through the process, the evacuation and the introduction of the encapsulated substance can be carried out without providing a protruding pipe for evacuation or the introduction of the encapsulated substance, and therefore, the light bulb can be manufactured economically. In addition, it is possible to eliminate the problems that conventionally occurred due to the protruding parts caused by protruding tubes, and since a laser beam with a small vibrational displacement is used as a heating source to close the pores, the laser beam is The laser beam is not concentrated in one place, and therefore it is possible to achieve hermetic sealing with less distortion than when performing hermetic sealing by concentrating the laser beam in one place, and as a result, hermetic sealing of the pores It is possible to reliably prevent the occurrence of premature cranking in the parts.

[Brief explanation of drawings]

FIGS. 1 to 6 are explanatory diagrams showing one embodiment of the present invention, FIG. 7 is an explanatory diagram of a light bulb obtained by the method of the present invention, and FIG. 8 is an explanatory diagram showing another embodiment of the present invention. , FIG. 9 is an explanatory diagram showing another example of the light bulb obtained by the present invention, and FIG.
The figure is an explanatory diagram showing an example of a filament assembly, Figures 11 and 12 are explanatory diagrams showing a conventional method of manufacturing a light bulb, and Figure 13 is an explanatory cross-section showing an example of a light bulb obtained by the conventional method. It is a diagram. F...Filament 12...Metal foil 13...
・External lead rod 1... filament assembly 21
...Protruding pipe 21^...Protruding part 2...
・Cylindrical glass tube 22... End 6... Heater
80...Pincher-7...Glass tube
31...Gas introduction pipe 71A, 71B...Pipe section for sealing part 8L82...Pincher 72...Airtight welded part 73
... Side part 74 ... Pore 100 ...
Head for evacuation and introduction of sealed substances 101...Stopper 102...Outer frame 103...Square ring
106... Compression fitting 107... Ventilation hole 9
...Laser oscillator 90...Optical system 9
1...Flat reflecting mirror 92...Shutter 93
...Shutter drive mechanism 94...Lens for condensing light
95... Drive mechanism 96... Position detection mechanism 200... Glass tube 201... Filament assembly 202... Metal foil 203... Pore 204
・・・Airtight welded part

Claims (1)

[Scope of Claims] 1) A glass tube having a tube portion for surrounding the light emitting portion and a tube portion for the sealing portion is used, and a power supply member is placed in the tube portion for the sealing portion of the glass tube, and a part of the power supply member is connected to the sealing portion. The power supply member is positioned so as to protrude from the glass tube portion, and the power supply member is hermetically welded by heating and pressing the sealing tube portion of the glass tube so that a pore communicating with the inside and outside of the glass tube remains in a part thereof. , comprising the step of evacuating the glass tube and introducing the enclosed substance through the pore, and then heating the glass surrounding the pore with a laser beam that vibrably slightly displaces the pore to close the pore. A method of manufacturing light bulbs. 2) The method for manufacturing a light bulb according to claim 1, wherein the laser beam is in the form of a small diameter beam focused by an optical system. 3) The light bulb according to claim 1, characterized in that an optical system having a flat reflecting mirror is used, and by vibratingly displacing the flat reflecting mirror, a laser beam with a small vibrational displacement is obtained. Production method.