JP2009009893A - Discharge lamp and electrode mount therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrode mount for a discharge lamp formed by surely laminating multiple pieces of metal foils, and to provide a discharge lamp sealed by foil with higher reliability. <P>SOLUTION: The electrode mount for the discharge lamp has a tension-applying mechanism for applying the tension to the metal foil in the extending direction of an electrode core. Further, the discharge lamp has a light-emitting unit and a sealing unit. The sealing unit is constituted of the electrode mount for the discharge lamp. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a discharge lamp electrode mount and a discharge lamp for forming a sealing portion in a discharge lamp having a foil sealing structure. More specifically, the present invention particularly includes three or more metal foils, and more than 100A. The present invention relates to a discharge lamp electrode mount and a high power discharge lamp which are preferably used for a large current discharge lamp.

  Conventionally, in a high-pressure or ultra-high pressure mercury lamp (hereinafter, collectively referred to as “ultra-high pressure discharge lamp”), which is a discharge lamp having a light emitting portion and a sealing portion and requires a large current, particularly. Since a high heat resistance and pressure resistance are required for the sealing portion, it is not a so-called rod seal structure that achieves hermetic sealing of the discharge vessel by directly welding the discharge vessel to the lead rod for power supply, A so-called foil sealing structure using a metal foil for sealing is employed.

  In an ultrahigh pressure discharge lamp having a sealing portion having such a foil sealing structure (hereinafter also referred to as “foil sealing portion”), a metal foil is used to hermetically seal a quartz glass discharge vessel. Although it is required to have a very small thickness, on the other hand, it is necessary to supply a large amount of electric power by supplying a large current to the metal foil. It is constituted by.

As shown in FIG. 7, a certain type of ultra-high pressure discharge lamp having a foil sealing portion has an elliptical light-emitting portion 51A and a straight tubular shape that is connected to both ends and extends outward in the tube axis direction. A pair of discharge lamp electrode mounts 71A each having an electrode (specifically, anode 12A and cathode 12B) at the tip thereof in a discharge vessel 51 made of quartz glass having a sealing portion 51B, 71B is arranged.
In FIG. 7, 56 is a base.

As shown in FIG. 8, for example, as shown in FIG. 8, the electrode mounts 71A and 71B for discharge lamps used as constituent members of the ultrahigh pressure discharge lamp 70 having such a foil sealing structure have an electrode (anode 12A in FIG. 8) at the tip. And an electrode core bar 11 that penetrates through the cylindrical first glass member 13 and has a ring-shaped first metal plate 17 joined to the base end, and one of them (left in FIG. 8). The other end of the second glass member 21 is a columnar second glass member 21 provided so that the end face of the other side faces the first glass member 13 with the first metal plate 17 in between. The power supply external lead rod 19 is inserted and fixed so as to protrude outward in the direction in which the electrode core rod 11 extends, in a through hole formed in the center portion thereof (located on the right side in FIG. 8). A second metal plate 25, and a plurality of Each of the strip-shaped metal foils 18 is joined along the outer peripheral surface of the second glass member 21 by joining one end to the first metal plate 17 and the other end to the second metal plate 25. (See, for example, Patent Document 1).
8 shows one discharge lamp electrode mount 71A of the pair of discharge lamp electrode mounts 71A and 71B provided in the ultrahigh pressure discharge lamp 70. The discharge lamp electrode mount 71B is shown in FIG. 7, the discharge lamp electrode mount 71 </ b> A has the same configuration except that a cathode 12 </ b> B is provided instead of the anode 12 </ b> A.

Utility Model Registration No. 2583317

  In the discharge lamp electrode mounts 71A and 71B having such a configuration, each of the three or more metal foils 18 is stretched in a state of being pulled in the direction in which the electrode core bar 11 extends (vertical direction in FIG. 7). In the assembling process, the metal foil 18 is attached by, for example, the other end of the metal foil 18 whose one end is joined to the first metal plate 17 by welding. The metal foil 18 is not pulled sufficiently but is attached in a relaxed state because it is performed manually by, for example, joining the second metal plate 25 by welding while pulling the 18 by hand. There is.

Thus, when the discharge lamp electrode mount provided in a relaxed state of the metal foil is used as a constituent member of the discharge lamp, the metal foil constituting the discharge lamp electrode mount has a very small thickness. Therefore, there is a problem that foil wrinkles or foil twists are likely to occur in the foil sealing portion of the obtained discharge lamp.
Here, in the discharge lamp, when foil wrinkles occur, sufficient adhesion is obtained between the inner peripheral surface of the discharge vessel forming the foil sealing portion and the metal foil in the foil sealing portion. There is a risk of leakage, especially when it occurs on the power supply external lead rod side, because cracks occur due to oxidation of the metal foil. Can lead to rupture. Also, when foil twisting occurs, foil breakage occurs, which may cause a problem of stopping power feeding.

The present invention has been made based on the above circumstances, and an object thereof is to provide an electrode mount for a discharge lamp having a configuration in which three or more metal foils are securely stretched. .
Another object of the present invention is to provide a discharge lamp having a foil sealing structure having high reliability.

The electrode mount for a discharge lamp according to the present invention has an electrode provided at a distal end portion thereof, an electrode core rod formed by penetrating a cylindrical first glass member and having a first metal plate joined to a proximal end portion. A columnar second glass member provided so that one end surface thereof faces the first glass member via the first metal plate, and the other end surface side of the second glass member And a second metal plate in which a power supply external lead bar is inserted and fixed so as to protrude outward in the direction in which the electrode core bar extends, in a through-hole formed in the center portion thereof, Three or more strip-shaped metal foils are joined along the outer peripheral surface of the second glass member by joining one end to the first metal plate and the other end to the second metal plate. In the extended discharge lamp electrode mount,
A tension applying mechanism for applying tension in the direction in which the electrode core bar extends to the metal foil is provided.

  In the electrode mount for a discharge lamp according to the present invention, the tension applying mechanism includes a bottom surface of the tension applying mechanism forming recess formed on the other end surface of the second glass member, and an inner side of the power supply external lead rod. It is preferable that a resilient member is provided between the end surface.

  Moreover, in the electrode mount for a discharge lamp according to the present invention, the tension applying mechanism is formed by screwing portions provided on each of the inner peripheral surface of the through hole of the second metal plate and the outer peripheral surface of the external lead rod for power supply. It is preferable.

The discharge lamp of the present invention is a discharge lamp having a light emitting portion and a sealing portion.
The sealing portion is formed by the above-described discharge lamp electrode mount.

  According to the electrode mount for a discharge lamp of the present invention, since a tension applying mechanism is provided, the tension is applied in the direction in which the electrode core bar extends to each of the plurality of metal foils by the action of the tension applying mechanism. Therefore, a configuration in which a plurality of metal foils are securely stretched can be obtained.

  In the discharge lamp of the present invention, since the sealing portion having the foil sealing structure is formed by the electrode mount for the discharge lamp of the present invention, the metal foil constituting the electrode mount for the discharge lamp has a very small thickness However, since the metal foil is stretched, in the manufacturing process, there is no problem caused by the fact that the metal foil is attached to the discharge lamp electrode mount in a relaxed state. Therefore, high reliability can be obtained.

  Hereinafter, the present invention will be described in detail.

FIG. 1 is an explanatory view showing an example of the configuration of the discharge lamp electrode mount of the present invention, and FIG. 2 is an enlarged explanatory view showing a tension applying mechanism constituting the discharge lamp electrode mount of FIG. This electrode mount for discharge lamp (hereinafter also simply referred to as “electrode mount”) 10 is a component of the sealing portion of the discharge lamp having a sealing portion having a foil sealing structure, and is a cylindrical electrode ( Specifically, the anode 12A) is provided with an electrode core rod 11 provided at the distal end portion (left end portion in FIG. 1), and the electrode core rod 11 has a base end portion (right end portion in FIG. 1), The overall shape is a columnar shape, and a truncated cone-shaped distal end portion 22 in which a ring-shaped first metal plate 17 adapted to the shape of the distal end surface 22A is disposed on the distal end surface 22A; Inserted into the electrode core rod fixing hole 22B having an opening in the tip surface 22A formed in the tip portion 22 of the second glass member 21 made of quartz glass having the columnar rear end portion 23 provided continuously. Is fixed by being.
The electrode core 11 is fixed by the second glass member 21, and the rear end face 15 </ b> A faces the front end face 22 </ b> A of the second glass member 21 through the first metal plate 17. A cylindrical tip portion 14 in which a concave portion 14B having an opening is formed on the tip end surface 14A thereof, and a truncated cone-shaped rear portion continuously provided on the tip portion 14 are arranged in a cylindrical shape. It is held by being inserted through an electrode core bar through-hole 13 </ b> A formed in a first glass member 13 made of quartz glass having an end 15.

On the rear end face 23A side of the second glass member 21 to which the electrode core bar 11 is fixed, an outer lead bar through hole 26A having a diameter suitable for the diameter of the power supply outer lead bar 19 is formed at the center. A second metal plate 25 having a cylindrical portion 26 is disposed, and a base end portion of the external lead rod 19 for power feeding (FIG. 1) is inserted into the through hole 26 A for the external lead rod in the second metal plate 25. Is inserted so that the power supply external lead rod 19 protrudes outward in the direction in which the electrode core rod 11 extends.
In the example shown in the figure, the second metal plate 25 has five L-shaped members 27 protruding from the outer peripheral surface of the cylindrical portion 26 so as to surround the cylindrical portion 26, as shown in FIG. Each of the five L-shaped members 27 is vertically connected to the second plate-like portion 27B so that the second plate-like portion 27B extends in parallel with the tubular portion 26. The end portion of the first plate-like portion 27A thus joined is joined to the outer peripheral surface of the tubular portion 26 by brazing. In addition, the other end of the metal foil 18 is joined to the outer surface of the second plate-like portion 27 </ b> B of the five L-shaped members 27 in the second metal plate 25. In the space that is formed, the external lead rod through hole 31A having a diameter suitable for the outer diameter of the cylindrical portion 26 of the second metal plate 25 is formed in a cylindrical shape, and the power supply external lead rod 19 is A third glass member 31 made of quartz glass for holding is disposed.

  Further, the second glass member 21 has three or more pieces (one in the example shown in the figure) in which one end is joined to the peripheral edge of the first metal plate 17 and the other end is joined to the second metal plate 25. 5 pieces of strip-shaped metal foils (for example, molybdenum foils) 18 are spaced apart from each other in the circumferential direction of the second glass member 21 and extend in the axial direction of the second glass member 21. The outer peripheral surface is extended.

  The electrode mount 10 has a tension applying mechanism that applies tension to each of the three or more metal foils 18 in the direction in which the electrode core bar 11 and the power supply external lead bar 19 extend (left and right direction in FIG. 1). Since a tension applying mechanism is provided, a gap S is formed between the rear end surface 23A of the second glass member 21 and the second metal plate 25. Yes.

The tension applying mechanism includes a bottom surface 41A of a recess 41 for forming a tension applying mechanism 41 having an opening adapted to the diameter of the external lead rod 19 for power supply formed on the rear end surface 23A of the second glass member 21; A configuration in which a resilient member made of, for example, a coil compression spring 43 is provided between the inner side of the external lead rod 19 (left side in FIGS. 1 and 2), that is, the end surface 19A of the base end portion. belongs to.
In the example of this figure, the base end portion of the feeding external lead rod 19 is inserted into the tension applying mechanism forming recess 41, and the tension applying mechanism forming recess 41 and the feeding external lead rod 19 In a space defined by the end surface 19A, one end of the coil is in contact with the bottom surface 41A of the tension applying mechanism forming recess 41, the other end is in contact with the end surface 19A of the power supply external lead rod 19, and the coil is compressed. A resilient member made of the compression spring 43 is arranged.

  As shown in FIG. 4, the discharge lamp electrode mount 10 having such a configuration can be manufactured through the following assembly process.

  First, the electrode core rod 11 is inserted into the through hole 17A for the electrode core rod of the first metal plate 17 and joined to a predetermined position by, for example, welding, and then three pieces are attached to the periphery of the first metal plate 17 One end of each of the three or more metal foils 18 is welded so that the metal foils 18 are separated from each other. Thereafter, the electrode core rod 11 is inserted into the electrode core rod through-hole 13A of the first glass member 13, and then the electrode (anode 12A) is fixed to the tip portion of the electrode core rod 11, whereby the electrode A core rod assembly is obtained.

  On the other hand, the power supply external lead rod 19 is inserted into the through hole 26A for the external lead rod in the cylindrical portion 26 of the second metal plate 25, and a predetermined position in the power supply external lead rod 19 is brazed, for example. By joining the second metal plate 25 and inserting the power supply external lead rod 19 joined to the second metal plate 25 into the through hole 31A for the external lead rod of the third glass member 31, An external lead rod assembly for power supply is obtained.

Next, the base end portion of the electrode core rod 11 according to the electrode core rod assembly is inserted into the electrode core rod fixing hole 22B of the second glass member 21, and tension is applied to the second glass member 21. After the coil compression spring 43 is inserted into the mechanism-forming recess 41, the base end portion of the power supply external lead rod 19 related to the power supply external lead rod assembly is pressed so that the coil compression spring 43 is pressed. The metal plate 25 is inserted so as to be in contact with the rear end surface 23A of the second glass member 21, and the coil compression spring 43 is thus compressed by an external force (for example, a pressing force applied by a hand). 2, the other end of each of the three or more metal foils 18 is welded to the outer surface of the second plate portion 27 </ b> B of the L-shaped member 27 of the second metal plate 25.
Then, after the other end of each of the three or more metal foils 18 is welded to the second metal plate 25, by applying an external force to the coil compression spring 43, the compression state of the coil compression spring 43 is loosened. A gap S is formed between the rear end surface 23A of the second glass member 21 and the second metal plate 25, and each of the three or more metal foils 18 includes the electrode core rod 11 and the power supply external lead rod 19. The discharge lamp electrode mount 10 is manufactured in the state of being stretched in the direction in which it extends.

The discharge lamp electrode mount 10 as described above includes the bottom surface 41A of the tension applying mechanism forming recess 41 formed in the second glass member 21 and the end surface 19A of the proximal end portion of the external lead rod 19 for power supply. Since a tension applying mechanism having a configuration in which a resilient member composed of a coil compression spring 43 is disposed between them, the elastic force of the coil compression spring 43 constituting the tension applying mechanism is increased to three or more. Since tension is applied to each of the metal foils 18 in the direction in which the electrode core bar 11 extends, a configuration in which three or more metal foils 18 are reliably stretched can be obtained.
Therefore, the electrode mount for discharge lamp 10 can be suitably used as a constituent member that constitutes a foil sealing portion of a discharge lamp for large current of 100 A or more.

FIG. 5 is an explanatory diagram showing an example of the configuration of the discharge lamp of the present invention using the above-described discharge lamp electrode mount 10.
The discharge lamp 50 is a discharge lamp for a large current of 100 A or more, and includes an elliptical light-emitting portion 51A and a straight tubular sealing portion 51B that is connected to both ends and extends outward in the tube axis direction. A discharge vessel 51 made of quartz glass is provided. In addition, one end portions of the discharge lamp electrode mounts 10 and 55 are disposed in the sealing portion 51 </ b> B of the discharge vessel 51.
5, the discharge lamp electrode mount 10 includes an anode 12A as an electrode, as shown in FIG. 1, while the discharge lamp electrode mount 55 has a cathode 12B as an electrode. It has the same configuration as that of the electrode mount 10 for a discharge lamp except that the cathode mount 12B is provided instead of the anode 12A. In the figure, 56 is a base.

  In this discharge lamp 50, the discharge lamp electrode mounts 10 and 55 are arranged such that the tip surface 14A of the first glass member 13 faces the light emitting space inside the light emitting portion 51A, and the electrode ( Specifically, the electrode core rod 11 provided with the anode 12A and the cathode 12B) is in a state of projecting and extending in the tube axis direction, and the sealing portion 51B is the first of the discharge lamp electrode mounts 10 and 55. The sealing member 51B is hermetically sealed by being welded to the outer peripheral surfaces of the glass member 13, the second glass member 21, and the third glass member 31 via three or more metal foils 18. Is formed. An appropriate luminescent material is sealed in the light emitting portion 51A as an enclosure.

The discharge lamp 50 having the above configuration can be manufactured by the following method.
For example, one of the discharge lamp electrode mounts (10 or 55) is inserted into a portion of the quartz glass tube for forming the discharge vessel, which is to be one sealing portion 51B, and disposed at a predetermined position, and then the quartz glass tube. Is heated by a burner or the like, thereby the quartz glass tube and the first glass member 13, the second glass member 21 and the third glass member in one of the discharge lamp electrode mounts (10 or 55). A glass member is hermetically welded via a plurality of metal foils 18 to form one sealing portion. After that, the sealed material is introduced into the quartz glass tube through the other end side of the quartz glass tube, and then the other discharge lamp electrode mount (55) is formed on the portion serving as the other sealing portion 51B in the quartz glass tube for the discharge vessel. Alternatively, 10) is inserted and placed at a predetermined position, and the other sealing portion is formed in the same manner as the method of forming one sealing portion.
Thus, the discharge lamp 50 in which the foil sealing structure of the sealing portion 51B is formed by the discharge lamp electrode mounts 10 and 55 is formed.

  According to the above discharge lamp 50, since the sealing portion 51B having the foil sealing structure is formed by the discharge lamp electrode mounts 10 and 55 of the present invention, the discharge lamp electrode mounts 10 and 55 are configured. Even if the three or more metal foils 18 are very thin, each of the three or more metal foils 18 is stretched. Therefore, in the manufacturing process, the metal foil is attached to the discharge lamp electrode mount. There is no problem that foil wrinkles or foil twists that cause malfunction of the discharge lamp do not occur in the sealing part of the discharge lamp obtained due to being mounted in a relaxed state. Therefore, high reliability can be obtained.

Although the embodiments of the present invention have been specifically described above, the present invention is not limited to the above examples, and various modifications can be made.
For example, as shown in FIG. 6, the tension applying mechanism of the discharge lamp electrode mount includes an inner peripheral surface of the external lead rod through hole 26 </ b> A of the second metal plate 25 and an outer peripheral surface of the power supply external lead rod 19. It may consist of screwed portions 61 and 62 provided in the.
Here, the electrode mount for the discharge lamp according to FIG. 6 has a different structure of the tension applying mechanism, specifically, a threaded portion 61 in which a male screw is threaded on the outer peripheral surface of the power supply external lead rod 19; A second glass member is formed with a threaded portion 62 formed by threading a female screw on the inner peripheral surface of the outer lead bar through hole 26A of the cylindrical portion 26 of the second metal plate 25. 21 is provided with an external lead bar through hole 63 instead of the tension applying mechanism forming recess 41, and the power supply external lead bar 19 is joined to the second metal plate 25 by brazing or the like. Instead of this, it has the same configuration as the electrode mount for the discharge lamp according to FIGS. 1 and 2 except that it is screwed and fixed.

  According to the discharge lamp electrode mount of FIG. 6, in the assembly process, when the other end of the metal foil 18, one end of which is welded to the first metal plate 17, is welded to the second metal plate 25, power feeding is performed. By rotating the external lead rod 19, the external surface until the end surface 19 A of the power supply external lead rod 19 is in contact with the bottom surface 63 A of the external lead rod through-hole 63 in the second glass member 21. After inserting into the lead bar through-hole 63 and completing the welding operation, the first metal is used to prevent wrinkles or foil twists in the three or more metal foils 18 with the power supply external lead bar 19 as the rotation center axis. The rear end surface 23A of the second glass member 21 and the second glass member 21 are rotated by rotating the constituent members while maintaining the positional relationship between the plate 17 and the second metal plate 25 in the circumferential direction of the external lead rod 19 for power supply. Metal plate 25 and A gap S is formed between them, and the fixing position of the second metal plate 25 can be adjusted so that the metal foil 18 is pulled in the direction in which the electrode core bar 11 and the power supply external lead bar 19 extend. .

  Accordingly, the discharge lamp electrode mount is formed by screwing portions 61 and 62 provided on the inner peripheral surface of the outer lead bar through hole 26A of the second metal plate 25 and the outer peripheral surface of the power supply outer lead bar 19, respectively. Since the tension applying mechanism having the above structure is provided, an electrode core rod is provided for each of the metal foils 18 by utilizing the function of adjusting the fixing position of the second metal plate 25 of the tension applying mechanism. Since tension can be applied in the direction in which 11 extends, a configuration in which the metal foil 18 is securely stretched can be obtained.

It is explanatory drawing which shows an example of a structure of the electrode mount for discharge lamps of this invention. FIG. 2 is an explanatory enlarged view showing a configuration of a tension applying mechanism provided in the discharge lamp electrode mount of FIG. 1. It is a perspective view for explanation which shows the composition of the 2nd metal plate which constitutes the electrode mount for discharge lamps of Drawing 1 with the external lead bar for electric power feeding. FIG. 2 is an assembly diagram of the electrode mount for the discharge lamp of FIG. 1. It is explanatory drawing which shows an example of a structure of the discharge lamp of this invention. It is explanatory drawing which shows the other example of a structure of the tension | tensile_strength addition mechanism provided in the electrode mount for discharge lamps of this invention. It is explanatory drawing which shows an example of a structure of the conventional discharge lamp. It is an assembly drawing of the electrode mount for discharge lamps which comprises the discharge lamp of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electrode mount for discharge lamps 11 Electrode core rod 12A Anode 12B Cathode 13 First glass member 13A Electrode core rod through hole 14 Front end portion 14A Front end surface 14B Recessed portion 15 Rear end portion 15A Rear end surface 17 First metal plate 17A Electrode core through-hole 18 Metal foil 19 Power supply external lead rod 19A End face 21 Second glass member 22 Front end 22A Front end 22B Electrode core fixing hole 23 Rear end 23A Rear end face 25 Second metal plate
26 Cylindrical portion 26A External lead rod through hole 27 L-shaped member 27A First plate portion 27B Second plate portion 31 Third glass member 31A External lead rod through hole 41 For forming a tension applying mechanism Recess 41A Bottom surface 43 Coil compression spring 50 Discharge lamp 51 Discharge vessel 51A Light emitting portion 51B Sealing portion 55 Discharge lamp electrode mount 56 Base 61, 62 Screwing portion 63 External lead rod fixing hole 63A Bottom surface 70 Discharge lamp lamp)
71A, 71B Discharge lamp electrode mount

Claims (4)

An electrode is provided at the distal end, passes through the cylindrical first glass member, and has an electrode core rod in which the first metal plate is joined to the base end, and one end face of the electrode core is the first A columnar second glass member provided so as to face the first glass member through a metal plate, and is located on the other end face side of the second glass member, and is formed at the center thereof. And a second metal plate inserted and fixed so that the power supply external lead rod protrudes outward in the direction in which the electrode core rod extends, and three or more strip-shaped metal foils are provided in the through-hole. Each of the electrode mounts for a discharge lamp is extended along the outer peripheral surface of the second glass member by joining one end to the first metal plate and the other end to the second metal plate. In
An electrode mount for a discharge lamp, wherein a tension applying mechanism is provided for applying a tension to the metal foil in a direction in which the electrode core bar extends.   The elastic member is provided between the bottom surface of the tension applying mechanism forming recess formed on the other end surface of the second glass member and the inner end surface of the power supply external lead rod. The electrode mount for a discharge lamp according to claim 1, wherein the electrode mount is for a discharge lamp.   2. The tension applying mechanism includes screwing portions provided on each of the inner peripheral surface of the through hole of the second metal plate and the outer peripheral surface of the external lead rod for power supply. Electrode mount for discharge lamps. In a discharge lamp having a light emitting part and a sealing part,
The discharge lamp, wherein the sealing portion is formed by the electrode mount for a discharge lamp according to any one of claims 1 to 3.

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