JP4138851B1 - Foil-sealed discharge lamp and electrode support rod halfway support member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge lamp capable of reducing the risk of explosion.
A bead 6 includes an inner cylinder part 26 and an outer cylinder part 28. The outer cylinder part 28 has a through hole 41 into which the inner cylinder part 26 can be inserted. The cap 9 side of the through-hole 41 has an inner taper portion into which the taper portion 9d of the cap 9 is inserted and abuts. A molybdenum foil 30 is wound around the inner cylinder portion 26 and inserted into the outer cylinder portion 28. By configuring the radial direction with two members, the thickness of each member can be reduced. A molybdenum foil 30 is provided between the members. Therefore, even if the strain due to heat increases during use, it is possible to prevent the stress resulting from the strain from being transmitted to the outer cylinder portion 28. Further, even when a crack occurs in the inner cylindrical portion 26, it can be prevented from being transmitted to the outer cylindrical portion 28.
[Selection] Figure 1

Description

  The present invention relates to a foil-sealed discharge lamp, and more particularly to the structure of an electrode support rod intermediate support member.

  Patent Document 1 discloses a foil-sealed discharge lamp in which the diameter of the inner lead bar holding cylinder 7 is the same as that of the sealing glass member 1 in order to prevent the electrode from tilting in the sealing process. ing.

Utility Kaihei 6-73856

  However, in the discharge lamp, since the inner lead bar holding cylinder 7 has the same diameter as the glass member 1, the inner lead bar holding cylinder 7 becomes thick. For this reason, if the internal lead bar holding cylinder 7 is distorted, the distortion increases due to heat during lighting, and if the allowable range is exceeded, the internal lead bar holding cylinder 7 cracks. Such cracks could rupture the bulb at that part.

  An object of the present invention is to provide a discharge lamp that solves the above-described problems and prevents the explosion.

1) Foil seal type discharge lamp according to the present invention, 1) at both ends of glass envelope having a seal portion, the electrode support bar having an electrode at the tip, 2) disposed in the sealing portion, of the electrode support bar A glass electrode support rod holding member that supports an end opposite to the tip; 3) a glass electrode that is arranged adjacent to the electrode side of the electrode support rod holding member and supports the middle of the electrode support rod 4) The electrode support rod intermediate support member includes a glass inner cylinder member that covers the electrode support rod and a glass member that covers the inner cylinder portion. The thin-plate-shaped shock absorbing material is provided in the meantime.

  Therefore, distortion is less likely to occur as much as the members constituting the electrode support rod intermediate support member can be made thin. Moreover, even if a crack occurs in the inner cylinder member, a buffer material is present between the outer member and the outer member, so that it is possible to prevent the crack from being transmitted to the outer member. Thereby, the burst of the discharge lamp can be prevented.

2) A glass electrode support rod intermediate support member according to the present invention is used adjacent to a glass electrode support rod holding member that supports an electrode support rod of a foil-sealed discharge lamp. an electrode support bar middle support member for supporting the glass of the inner cylindrical member for covering the electrode support bar, b) consists of a hollow cylinder made of glass which covers the inner cylindrical portion, the cushioning material is provided in between It has been. Therefore, distortion is less likely to occur as much as possible, and even if a crack occurs in the inner cylinder member, a cushioning material exists between the outer member and the crack, and transmission of the crack to the outer member can be prevented. Thereby, the burst of the discharge lamp can be prevented.

3) In the halfway support member made of glass according to the present invention, the outer peripheral member has a diameter in the circumferential direction that increases from an end portion on the electrode support rod holding member side toward an end portion on the opposite side. At the end of the electrode support bar holding member that is formed, a recess is provided in which the tip of the electrode support bar holding member tapered so as to have a tapered diameter can be inserted. Therefore, when the tip of the electrode support bar holding member is inserted, the outer periphery of the outer peripheral member becomes larger in the direction toward the electrode from the middle of the tapered surface of the electrode support bar holding member. Therefore, even if the overall length of the electrode support rod halfway support member is shortened, a more gentle sealing portion can be formed.

4) In the electrode support rod intermediate support member made of glass according to the present invention, the outer shape of the outer peripheral member is formed such that the diameter in the circumferential direction increases in the direction toward the electrode, and the outer shape of the inner cylindrical member And the inner shape of the said outer peripheral member is formed so that the diameter of the circumferential direction may become large in the direction which goes to an electrode. Therefore, the difference between the thick part and the thin part can be reduced in the outer peripheral member. Thereby, it can be made hard to produce distortion more.

5) In the glass electrode support rod intermediate support member according to the present invention, the buffer material is a metal thin film. Therefore, the bursting can be prevented with a simple configuration in which a metal thin film is provided between the inner cylinder member and the outer peripheral member.

  In the embodiment, the metal thin film is wound around the outer periphery of the inner cylinder member. Alternatively, as shown in FIG. 8, the metal thin film is provided only in a part between the inner cylinder member 26 and the outer periphery member 28. The metal thin film may be formed so that the space 62 is present in the region that is not.

6) In the glass electrode support rod intermediate support member according to the present invention, the outer peripheral portion is further divided in parallel to a direction perpendicular to the axial direction of the support rod, and a buffer member is provided therebetween. Yes. Therefore, the outer peripheral member can be composed of a plurality of members.

7) In the glass electrode support rod halfway support member according to the present invention, the outer peripheral portion is composed of a plurality of cylindrical members, and the diameter increases as the electrode approaches. Therefore, the said outer peripheral member can be comprised with the cylindrical member from which a diameter differs.

9) The electrode support rod intermediate support member made of glass according to the present invention is used adjacent to the electrode support rod holding member that supports the electrode support rod of the foil seal type discharge lamp, and supports the middle of the electrode support rod. The rod halfway support member is composed of a plurality of glass parts, and a buffer material is provided between the parts. Therefore, it is possible to reduce the thickness of the glass electrode support rod halfway support member, which makes it difficult for distortion to occur, and even if any of the plurality of members is distorted and increases due to heat to cause cracks, other members Since the cushioning material exists between the two, the crack is not transmitted to the other members.

  The correspondence between the terms used in the claims and the members in the embodiments will be described. The “electrode support bar holding member” is the cap 9, the “electrode support bar intermediate support member” is the bead 6, the “inner cylinder member” is the inner cylinder part 26, and the “outer peripheral member” is the outer cylinder part 28. However, the “buffer material” corresponds to the molybdenum foil 30.

In addition, “the diameter in the circumferential direction increases from the end on the electrode support rod holding member side to the end on the opposite side” means that the taper is smooth and has a large diameter as shown in FIG. Of course, as shown in FIG. 5 , the case where the diameter increases gradually is included. It also includes the case where the taper extends to the middle and becomes the same diameter thereafter.

  FIG. 1 shows a main cross-sectional view of a discharge lamp 1 according to the present invention. The discharge lamp 1 is a foil seal type discharge lamp, and includes a sealing body 3, an anode 5, a lead bar 7, a cap 9, and beads 6.

  The sealing body 3 has sealing portions 3a at both ends. A glass cap 9 is disposed in the sealing portion 3a.

  The proximal end of the lead bar 7 is inserted into the distal end of the cap 9. Thereby, the lead rod 7 is supported. One or more metal foils 13 are provided on the outer periphery of the cap 9 as a conductive member for energizing the anode 5. A metal plate 15 having a through hole into which the lead bar 7 is inserted is provided at the tip of the cap 9. The metal plate 15 and the lead bar 7 are electrically connected. The metal plate 15 and the metal foil 13 are also electrically connected. As a result, the anode 5 provided at the tip of the lead rod 7 can be energized from the outside.

  The beads 6 will be described with reference to FIG. The bead 6 includes an inner cylinder part 26 and an outer cylinder part 28. The inner cylinder portion 26 is made of glass and has the same diameter d as the metal plate at the tip of the cap 9. Moreover, it has the collar part 32 in one end, and has the through-hole 29 in which the lead bar 7 is inserted in the center. The outer cylinder part 28 has a through hole 41 into which the inner cylinder part 26 can be inserted. The cap 9 side of the through hole 41 has an inner tapered portion 43 into which the tapered portion 9d of the cap 9 is inserted and abuts. Further, the outer cylindrical portion 28 has an outer tapered portion 47 on the outer periphery. A molybdenum foil 30 is wound around the inner cylinder portion 26 and inserted into the through hole 41 of the outer cylinder portion 28. Thus, about the bead 6, the radial direction thickness can be made thin about the member here by comprising the radial direction by two members. A molybdenum foil 30 is provided between the members. Therefore, even if the strain due to heat increases during use, it is possible to prevent the stress resulting from the strain from being transmitted to the outer cylinder portion 28. Further, even when a crack occurs in the inner cylindrical portion 26, it can be prevented from being transmitted to the outer cylindrical portion 28.

 Further, an outer tapered portion 47 and an inner tapered portion 43 are provided for the outer cylinder portion 28. Therefore, when the cap 9 is inserted into the outer cylinder portion 28, one end of the taper of the bead 6 is located in the middle of the taper surface of the cap 9. This has the following advantages. The taper angle θ (see FIG. 3) of the bead 6 can be reduced as compared with the case where the taper is formed from substantially the same diameter as the metal plate provided at the tip of the cap 9 as shown in FIG. . Thereby, a taper part can be sealed smoothly. Of course, if the taper of the bead 6 is only loosened, the total length of the bead 6 may be increased accordingly. However, the bead 6 is required to shorten the distance L (see FIG. 3) from the metal plate at the tip of the cap 9 to the end on the electrode side. Therefore, the taper angle can be relaxed while satisfying this requirement.

  If such a request does not cause a problem, an embodiment is possible as shown in FIG.

  FIG. 4 shows an embodiment in which the outer cylinder portion 28 is further divided into a plurality of members 28a to 28c in the axial direction. As described above, by dividing the outer cylinder part in the axial direction, the axial thickness of the outer cylinder part can be reduced, so that the distortion can be further reduced. A cushioning material may be provided between the plurality of members 28a to 28c.

  FIG. 5 shows an embodiment in which the outer cylinder portion 28 is constituted by cylindrical members 29a to 29e having different diameters. In this way, by configuring the outer cylinder portion with the cylindrical members 29a to 29e having different diameters, the outer cylinder portion can be configured without tapering.

  FIG. 6 shows an embodiment in which the inner diameter of the outer cylinder portion 28 is also tapered. Thus, by making the inner diameter of the outer cylinder part 28 and the inner cylinder part 26 tapered, even when the outer cylinder part is tapered, the thickness of the outer cylinder part can be made more uniform. . Thereby, the possibility that the outer cylinder portion may burst due to distortion can be reduced.

  In this embodiment, the through-hole 41 is provided in the outer cylinder part 28, the collar part 32 is provided in the inner cylinder part 26, and the inner cylinder part 28 and the outer cylinder part 28 are positioned (refer FIG. 1). However, various modifications are possible for the relationship between the inner cylinder part 26 and the outer cylinder part 28. For example, in the above-described embodiment, the through hole 41 having the same diameter as the outer diameter of the metal plate 15 is formed. In any case, it suffices if the bead 6 has a recess into which the tip of the cap 9 is inserted.

  Furthermore, in this embodiment, although the case where it comprised with the inner cylinder part 26 and the outer cylinder part 28 in FIG. 1 was demonstrated, as shown in FIG. 7, the bead 6 can also be comprised. Even in this case, the taper angle can be relaxed while shortening the overall length.

  In the above embodiment, the metal thin film is wound around the outer periphery of the inner cylinder member. However, as shown in FIG. 8, a plurality of molybdenum foils 60 are provided only in a part between the inner cylinder member 26 and the outer periphery member 28. The metal thin film may be formed so that the space 62 exists in a region where the metal thin film does not exist.

  In the present embodiment, the anode-side holding has been described, but the present invention can be similarly applied to the cathode.

In the present embodiment, the case where the inner cylindrical portion and the outer cylindrical portion are configured, that is, the case where the radial direction is configured by a plurality of members has been described. Can also be configured. Even in this case, since the axial thickness is reduced, the occurrence of distortion can be reduced. In that case, you may provide a buffer material between each member.

  In this embodiment, the beads 6 are made of the same quartz glass as that of the envelope 3, but other materials may be used. In this case, those having the same thermal expansion coefficient are preferable.

1 is a cross-sectional view of a main part of a discharge lamp 1. FIG. 4 is a detailed view of beads 6. It is a figure which shows other embodiment. It is a figure which shows other embodiment. It is a figure which shows other embodiment. It is a figure which shows other embodiment. It is a figure which shows other embodiment. It is a figure which shows other embodiment regarding metal foil.

Explanation of symbols

3 ... Sealed body 5 ... Anode 6 ... Bead 7 ... Lead rod 9 ... Cap 26 ... Inner cylinder 28 ... Outer cylinder 30 ... Molybdenum foil

Claims (9)

A glass envelope having sealing portions at both ends,
An electrode support rod having an electrode at the tip,
Wherein arranged in the sealing portion, a glass electrode support rod holding member and the tip of the electrode support bar for supporting the end portion of the opposite side,
An electrode support rod halfway support member made of glass that is arranged adjacent to the electrode side of the electrode support rod holding member and supports the middle of the electrode support rod,
A foil-sealed discharge lamp comprising:
The electrode support rod halfway support member includes a glass inner cylinder member that covers the electrode support rod and a glass outer peripheral member that covers the inner cylinder portion, and a thin plate-like cushioning material is provided therebetween. That
A foil-sealed discharge lamp characterized by Used adjacent to the electrode support rod holding member made of glass that supports the electrode support rod of the foil seal type discharge lamp, an electrode support rod intermediate support member made of glass that supports the middle of the electrode support rod,
It said electrode support rod made of glass inner cylindrical member to cover, and consists of a hollow cylinder made of glass which covers the inner cylindrical portion, the cushioning material is provided therebetween,
An electrode support rod halfway support member made of glass . In the electrode support rod halfway support member made of glass of claim 2,
The outer peripheral member is formed so that a diameter in a circumferential direction increases from an end portion on the electrode support rod holding member side toward an end portion on the opposite side, and at an end portion on the electrode support rod holding member side. Is provided with a recess into which the tip of the electrode support rod holding member tapered so as to have a tapered diameter can be inserted;
It is characterized by. In the electrode support rod halfway support member made of glass of claim 2 or claim 3,
The outer shape of the outer peripheral member is formed so that the diameter in the circumferential direction increases in the direction toward the electrode,
The outer shape of the inner cylinder member and the inner shape of the outer peripheral member are formed such that the diameter in the circumferential direction increases in the direction toward the electrode,
It is characterized by. In the glass electrode support rod halfway support member according to any one of claims 2 to 4,
The buffer material is a metal thin film;
It is characterized by. In the electrode support rod halfway support member made of glass of claim 2,
Further, the outer peripheral portion is divided in parallel to a direction orthogonal to the axial direction of the support rod, and a buffer member is provided therebetween.
It is characterized by. In the electrode support rod halfway support member made of glass of claim 6,
The outer peripheral portion is composed of a plurality of cylindrical members, and its diameter increases as it approaches the electrode.
It is characterized by. A discharge lamp comprising the glass electrode support rod intermediate support member according to any one of claims 2 to 7. Used adjacent to the electrode support rod holding member made of glass that supports the electrode support rod of the foil seal type discharge lamp, an electrode support rod intermediate support member made of glass that supports the middle of the electrode support rod,
It consists of multiple glass parts,
Buffer material is provided between each part,
An electrode support rod halfway support member made of glass .

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