JPH0660960U - lamp - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a lamp that can obtain a long service life without causing an accident in the glass portion of the sealing tube even for a large current. [Structure] A glass sealing body including a light emitting space surrounding portion and a sealing tube portion, a glass member disposed inside the sealing tube portion, and a glass member disposed on one side facing the light emitting space surrounding portion side. A metal plate, an inner lead rod fixed to the metal plate, an electrode or filament provided at the tip of the inner lead rod, and the other side facing the outer end side of the sealing tube portion of the glass member. An external lead rod, a first metal foil whose one end is connected to the metal plate and the other side is connected to the external lead rod, and a second metal foil which is arranged so as to overlap the first metal foil. The first metal foil has, on both side edges of one end side portion continuing from the one end portion, a hypotenuse portion formed so that its width becomes smaller toward the one end portion, and the hypotenuse portion is the knife edge. It is characterized in that it is formed in a shape.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lamp, and more particularly to a lamp having a hermetically sealed structure suitable for large current.

[0002]

[Prior art]

 Lamps such as mercury vapor lamps are widely used in the field of utilizing ultraviolet rays emitted therefrom, for example, in the photochemical industry field, in the field of semiconductor device manufacturing, and in other fields.

For example, in a high-voltage or ultra-high-pressure mercury lamp for a large current, a large amount of mercury, which is the main component of the luminescent gas, is enclosed, the gas pressure inside the envelope during lighting is very high, and the amount of heat generated is large. In particular, the glass of the hermetically sealed portion is required to have high heat resistance and pressure resistance. And it is necessary that the mercury inside the envelope is completely evaporated during lighting, and therefore there is no need to have a low temperature part in the envelope during lighting where condensation of mercury occurs. .

Therefore, in the conventional high-pressure or ultra-high-pressure mercury lamp, the so-called rod which achieves the airtight sealing of the sealed body by directly welding the glass forming the sealed body of the lamp to the lead rod for power supply. Instead of a seal structure, a so-called foil seal structure that uses metal foil for sealing is used.

FIG. 6 is an explanatory diagram showing an example of a high pressure mercury lamp having a foil seal structure. In this high-pressure mercury lamp, the peripheral wall 16 of the bottomed tubular body 1 made of glass has a tapered outer peripheral surface (hereinafter, this portion is referred to as a “tapered portion”) T on the peripheral wall portion following the outer end surface 12 of the bottom wall. For example, four strip-shaped metal foils 2 are arranged so as to be spaced apart from each other in the circumferential direction of the bottomed tubular body 1 and extend in the axial direction of the bottomed tubular body 1, and one end portion 21 of each of these metal foils 2 1 On the metal plate 31 arranged at the base end portion of the inner lead rod 3 arranged so as to extend along the taper portion T of the peripheral wall 16 of the bottomed tubular body 1 and further project and extend from the outside of the bottom wall 15. On the other hand, the other end portion 22 of each of the metal foils 2 is connected to the outer circumference of the external lead rod 4 inserted into the cylindrical hole of the bottomed cylindrical body 1 to form the sealing conductive portion 5. There is. Further, 10 is a glass cylindrical body for holding the external lead rod 4 inserted into the bottomed cylindrical body 1, 6 is an electrode fixedly provided at the tip of the internal lead rod 3, and 7 is for holding the internal lead rod 3. It is a glass cylinder.

Then, the conductive portion 5 for sealing is inserted and arranged in the sealing tube portion 81 of the glass sealing body 8 so that the electrode 6 is located in the light emitting space surrounding portion 82 of the sealing body 8, and the sealing tube portion 81 The outer periphery of the sealed tube portion 81 and the outer periphery of the bottomed cylindrical body 1 are hermetically welded via the metal foil 2 by heat treatment from the outside. On the base end side of the inner lead rod 3, the glass in the portion of the sealing tube portion 81 facing the glass cylinder 7 is heated or pressed, or a negative pressure is applied to the sealing tube portion 81 to cause this negative pressure. The narrowed portion 9 is formed by fusing with the glass tubular body 7 by means of, and at the outer end portion of the sealing tube portion 81, the glass of the outer end portion is heated and melted to form the metal foil 2 Cover the exposed parts of the glass with glass. Also in the other sealing tube portion, a high-pressure mercury lamp is configured by connecting the sealing conductive portion configured similarly to the sealing conductive portion 5 in the same manner as described above.

[0007]

[Problems to be solved by the device]

 However, the conventional high-pressure mercury lamp having the above-described structure is normally used for a current of 50 to 150 A. However, when a high-pressure mercury lamp for a large current of 200 A or more is produced, the sealing tube portion 81 is cracked. Therefore, there is a problem in that a long service life cannot be obtained due to such problems.

The present invention has been made based on the above circumstances, and its purpose is to provide a long service life without causing an accident in the glass portion of the sealing tube even when used for a large current. It is to provide a lamp that can obtain life.

[0009]

[Means for Solving the Problems] A lamp according to the present invention comprises a glass sealing body including a light emitting space surrounding portion and a sealing tube portion following the luminous space, and a columnar shape disposed inside the sealing tube portion of the sealing body. A glass member, a metal plate arranged on one side of the glass member facing the light emitting space surrounding portion side, a base end fixed to the metal plate, and a tip arranged so as to extend into the light emitting space surrounding portion. An inner lead rod, an electrode or filament provided at the tip of the inner lead rod, an outer lead rod arranged on the other side of the glass member facing the outer end side of the sealing tube portion, and the glass member A first metal foil, which extends along the outer periphery and has one end connected to the metal plate and the other side electrically connected to the external lead rod, and a first metal foil stacked on the first metal foil. Comprising a second metal foil arranged The first metal foil has a hypotenuse portion formed so that its width becomes smaller toward the one end portion at both side edges of the one end side portion following the one end portion connected to the metal plate. The hypotenuse part is formed into a knife edge shape.

Further, two or more stacks of the first metal foil and the second metal foil stacked on the first metal foil are spaced apart in the same direction on the outer peripheral surface of the glass member. It is characterized by being provided.

[0011]

[Action]

 The first metal foil extending along the outer periphery of the glass member is formed so that the width thereof becomes smaller toward the one end at both side edges of the one end side portion following the one end connected to the metal plate. Since there is a hypotenuse part and the hypotenuse part is formed in a knife edge shape, there is less distortion in the hermetically sealed part due to the outer peripheral surface on the light emitting space surrounding part side of the glass member and the inner wall surface of the sealing tube part. As a result, a long service life is obtained.

[0012]

【Example】

 Hereinafter, an example of the lamp of the present invention will be described in the case of constituting a high pressure mercury lamp. FIG. 1 is an explanatory diagram showing the configuration of an embodiment of the present invention. In this figure, 1 is a bottomed tubular body, 2 is a first metal foil, 3 is an inner lead rod, 4 is an outer lead rod, and 25 is a second metal foil that is placed on top of the first metal foil 2. , 31 are metal plates, and 41 is a metal member, and these constitute the sealing conductive portion 5. Further, 6 is an electrode and 8 is a seal.

The cylindrical bottomed cylindrical body 1 made of quartz glass has a tapered taper portion T on a peripheral wall 16 of a portion of the bottom wall 15 following the outer end surface 12, and the bottom portion is formed into a truncated cone shape. There is.

A disc-shaped metal plate 31 having a diameter slightly smaller than the diameter of the bottom wall outer end face 12 is arranged on the bottom wall outer end face 12 of the bottomed cylindrical body 1, and the center of the metal plate 31 is arranged. The inner lead rod 3 is fixedly provided so as to extend in the axial direction of the envelope 8 toward the light emitting space surrounding portion 82. Further, a cylindrical electrode 6 is provided at the tip of the inner lead rod 3, and the inner lead rod 3 is held between the outer periphery of the inner lead rod 3 and the inner periphery of the narrowed portion 9 of the sealing body 8. A glass cylinder 7 for performing the operation is arranged.

The method of connecting the metal plate 31 and the inner lead bar 3 is not particularly limited, but for example, the metal plate 31 and the inner lead bar 3 are butt-welded together, or a hole is formed in the center of the metal plate 31, A method of inserting the base end of the inner lead rod 3 into this hole and welding the both can be used. Examples of the material for forming the metal plate 31 include high melting point metals such as tantalum, niobium, tungsten, and molybdenum.

An outer lead rod 4 having an outer diameter suitable for this is inserted into the inside of the cylinder hole of the bottomed cylinder body 1, and the outer lead bar 4 is connected to the opening end side of the bottomed cylinder body 1. A dish-shaped metal member 41 having a hole formed in the bottom thereof is arranged, and a glass cylinder body for holding the external lead rod 4 is arranged via the metal member 41. Examples of the material for forming the metal member 41 include molybdenum.

On the outer circumference of the bottomed cylinder 1, for example, six strip-shaped molybdenum first metal foils 2 are arranged so as to be spaced apart from each other in the circumferential direction and extend in the axial direction of the bottomed cylinder 1. Now, one end portion 21 of each of these first metal foils 2 extends along the taper portion T of the peripheral wall of the bottomed tubular body 1, and further the metal plate 31 disposed at the base end portion of the inner lead rod 3. It is connected by means such as spot welding. The other end 22 of each metal foil 2 is connected to the metal member 41.

As shown in FIG. 2A, in the first metal foil 2, both side edges 23 and 24 of one end side portion following one end portion 21 connected to the metal plate 31 are moved toward the one end portion 21. It is formed as a hypotenuse S having a smaller width, and the hypotenuse S is formed in a knife edge shape as shown in FIG. Further, as shown in FIG. 2C, the hypotenuse portion S is positioned on the outer peripheral surface of the taper portion T of the bottomed tubular body 1.

A notched arc-shaped recess C having a radius of curvature substantially the same as the radius of curvature of the outer peripheral surface of the inner lead bar 3 is formed at the tip edge of each one end 21 of the metal foil 2. As shown in FIG. 3, the metal foil 2 is welded to the metal plate 31 in a state where the arcuate recess is in contact with the outer peripheral surface of the inner lead rod 3.

The separation distance P1 between the adjacent first metal foils 2 at the outer peripheral edge of the metal plate 31 varies depending on the diameter of the metal plate 31, but is usually selected in the range of 1 to 5 mm. When the separation distance P1 is less than 1 mm, the distortion of the sealing tube portion 81 becomes large in the vicinity of the outer peripheral edge portion of the metal plate 31, so that the pressure resistance of the sealing tube portion 81 decreases. When the separation distance P1 is 5 mm or more, the width of the metal foil 2 at the outer peripheral edge of the metal plate 31 must be reduced or the number of metal foils 2 must be reduced, so that a large current can be handled. Will be difficult.

Further, as shown in FIG. 4, the distance P2 between the adjacent first metal foils 2 on the outer peripheral surface of the portion of the bottomed tubular body 1 below the taper portion T is equal to the bottomed tubular body. Although it depends on the diameter of 1, the distance is usually selected in the range of 1 to 5 mm for the same reason as the distance P1 between the two adjacent first metal foils in the outer peripheral portion of the metal plate 7 described above.

As shown in FIG. 5, a second metal foil 25 made of molybdenum is arranged on the outer surface of the first metal foil 2 so as to be superposed thereon. The second metal foil 25 is arranged in a portion excluding the one end side portion following the one end portion 21 of the first metal foil 2, and particularly, from the one end side tip 25a of the second metal foil 2 to the bottomed cylinder. The distance d1 to the trailing edge R of the tapered portion T of the body 1 is preferably arranged to be 1 to 2 mm. By arranging the second metal foil 25 in this way, the taper portion T of the bottomed tubular body 1 and the sealing tube portion 81 are sufficiently sealed, and the pressure inside the sealing body 8 is sufficiently endured. You will get it. In addition, the second metal foil 25 is preferably arranged in a portion of the first metal foil 2 excluding the other end portion 22, and the second metal foil 25 has a bottomed cylinder from the tip 25b on the other end side. The distance d2 to the open end edge 13 of the body 1 is preferably arranged to be 1 to 2 mm. By arranging the second metal foil 25 in this manner, the opening end side of the peripheral wall of the bottomed tubular body 1 and the sealing tube portion 81 are sufficiently sealed, so that the outside air is not exposed. Therefore, the oxidation of the first metal foil 2 and the oxidation of the second metal foil are prevented.

Then, by heating the bottomed tubular body 1 from the outside of the sealing tube portion 81 of the sealing body 8, for example, the outer circumference of the bottomed tubular body 1 and the inner circumference of the sealing tube portion 81 become first. The glass is welded in an airtight manner via the metal foil 2 and the second metal foil 25. Further, at the base end side of the inner lead rod 3, the glass in the portion of the sealing tube portion 81 facing the glass cylindrical body 7 is The constricted portion 9 is formed by heating and pressing or by applying a negative pressure to the inside of the sealing tube portion 81 and welding the negative pressure to the glass cylindrical body 7. In the other sealing tube portion, although not shown, the sealing conductive portion formed in the same manner as the sealing conductive portion 5 is connected in the same manner as described above to form the sealing body 8.

According to the above-described embodiment, the first metal foil 2 extending along the outer periphery of the bottomed tubular body 1 has the both side edges 23 of the one end side portion following the one end portion 21 connected to the metal plate 31. 24 has a hypotenuse part S formed so that its width becomes smaller toward the one end part 21, and since the hypotenuse part S is formed in a knife edge shape, the first metal foil 2 The strain generated in the airtightly sealed portion by the outer peripheral surface of the bottomed cylindrical body and the inner wall surface of the sealing tube portion 81 at both side edges of the one end side portion continuing from the one end portion 21 is reduced.

Further, since the second metal foil 25 is arranged so as to overlap the first metal foil 2, it is possible to suppress heat generation of the sealing conductive portion 5 due to a large current, and as a result, during lighting. It is possible to suppress the distortion of the sealing tube portion 81 caused by the odor.

Although one embodiment of the present invention has been described above, various modifications can be made in the present invention. For example, the outer shape of the bottomed cylindrical body 1 is not limited to a columnar shape, and may be appropriately selected depending on the number of the first metal foils 2 to be used, and may be, for example, an octagonal pillar shape, a hexagonal pillar shape, or the like.

Further, without using the metal member 41, the other end portion 22 of the first metal foil 2 is bent at the opening end edge 13 of the bottomed tubular body 1 and directly connected to the outer periphery of the external lead bar 4. May be.

Further, if necessary, it is possible to stack a metal foil on the second metal foil 25 and arrange the metal foil.

The airtight sealing structure described above can also be applied to other lamps that require a large current. For example, instead of using the electrode 6, a so-called coil-shaped filament is connected. You may use it for an incandescent light bulb.

[0030]

[Effect of device]

 As described above, according to the present invention, it is possible to provide a lamp that can have a long service life without causing an accident in the glass portion of the sealing tube even for a large current. .

[Brief description of drawings]

FIG. 1 is an explanatory vertical sectional front view showing an enlarged main part of an embodiment of the present invention.

FIG. 2 is an explanatory view showing a first metal foil according to an embodiment of the present invention.

FIG. 3 is an explanatory view showing a connection state of a first metal foil and a metal plate in one embodiment of the present invention.

FIG. 4 is an explanatory view showing an arrangement state of a first metal foil in one embodiment of the present invention.

FIG. 5 is an explanatory view showing an arrangement state of the second metal foil in the embodiment of the present invention.

FIG. 6 is an explanatory vertical sectional front view showing the configuration of a conventional discharge lamp having a foil seal structure.

[Explanation of symbols]

1 Bottomed cylindrical body 12 Bottom wall outer end surface 13 Opening end edge 15 Bottom wall 16 Peripheral wall 2 First metal foil 21 One end 22 Other end 25 Second metal foil 3 Inner lead rod 31 Metal plate 4 External lead rod 41 metal member 5 conductive part for sealing 6 electrode 7 glass tubular body 8 sealing body 81 sealing tube portion 82 light emitting space surrounding portion 9 narrowing portion 10 glass tubular body C arcuate concave portion S oblique side portion T taper portion

Claims (2)

[Scope of utility model registration request] 1. A glass sealing body comprising a light emitting space surrounding portion and a sealing tube portion following the light emitting space, a columnar glass member disposed inside the sealing tube portion of the sealing body, and the light emission of the glass member. A metal plate disposed on one side facing the space surrounding portion side, an inner lead rod having a base end fixed to the metal plate and a tip arranged to extend into the light emitting space surrounding portion, and the inner lead rod of the inner lead rod. An electrode or filament provided at the tip, an external lead rod arranged on the other side facing the outer end side of the sealing tube portion of the glass member, and extending along the outer periphery of the glass member, one end of which A first metal foil connected to the metal plate, the other side portion of which is electrically connected to the external lead rod, and a second metal foil arranged so as to overlap the first metal foil. The first metal foil is in contact with the metal plate. On both side edges of the one end side portion following the one end portion, there is a hypotenuse portion formed so that its width becomes smaller toward the one end portion, and the hypotenuse portion is formed in a knife edge shape. Characterized lamp. 2. Two or more stacks of a first metal foil and a second metal foil stacked on the first metal foil are provided on the outer peripheral surface of the glass member so as to be spaced apart in the same direction. The lamp according to claim 1, wherein the lamp is provided.