JP2014049342A - Hid lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an overcurrent limiting body from being broken by reducing stress applied to the overcurrent limiting body.SOLUTION: The HID lamp includes a luminous tube 2, a pair of electrode structures 41, 42, one end parts of which are disposed face to face inside of the luminous tube 2 and the other end parts of which are extending out of the luminous tube 2, a pair of power supply members 51, 52 that introduces power from outside into the pair of electrode structures 41, 42, an insulation member 6 that couples one of the electrode structures 41 to one of the power supply members 51, and an overcurrent limiting body 7 a part of which is coupled to one of the electrode structures 41 and the other part of which is coupled to one of the power supply members 51.

Description

  The present invention relates to an HID lamp (also referred to as a high-pressure discharge lamp or a high-intensity discharge lamp), and more particularly to an HID lamp in which an overcurrent limiter such as a fuse is provided in the HID lamp.

  For example, in a ceramic metal halide lamp of 270 W, 360 W, etc., as shown in Patent Document 1, a metal wire as an overcurrent limiter is electrically connected in series with an electrode of an arc tube in the lamp. .

  In this ceramic metal halide lamp, as shown in FIG. 6, the arc tube 11 is held by a support conductor 13 made of a metal rod provided in an outer tube (also referred to as an outer sphere) 12. Specifically, the electrode structure 14 extending from the arc tube 11 to one side (upper side in FIG. 6) is held by being connected to the support conductor 13. Further, the electrode structure 15 extending from the arc tube 11 to the other side (lower side in FIG. 6) is electrically connected to a power supply member 16 that is insulated from the support conductor 13.

  Here, in the conventional structure, the metal wire 17 is connected to the electrode structure 15 by connecting one end of the metal wire 17 to the electrode structure 15 and connecting the other end of the metal wire 17 to the power supply member 16. It is configured to be connected in series.

  However, the arc tube 11 is supported by the support conductor 13 and the electrode structure 15 is supported by the support conductor 13, while the power feeding member 16 is separated from the support conductor 13 (specifically, the stem 18). Since it is supported, the electrode structure 15 and the power supply member 16 vibrate separately. The metal wire 17 connecting the electrode structure 15 and the power supply member 16 has a problem that stress concentration occurs in the specific portion, and the metal wire 17 is broken due to metal fatigue. If it does so, conduction | electrical_connection cannot be taken and the problem of a lamp defect will arise.

Japanese Patent No. 4471070

  Accordingly, the main object of the present invention is to reduce the stress applied to the overcurrent limiting body such as a metal wire and prevent the overcurrent limiting body from being damaged.

  That is, the HID lamp according to the present invention includes an arc tube in which a luminescent material is enclosed, a pair of electrodes disposed opposite to each other in the arc tube, and a pair of power feeding structures for introducing power to the pair of electrodes. The one power feeding structure includes a first power feeding element and a second power feeding element connected by an insulating member, and a part of the overcurrent limiting body is connected to the first power feeding element. The other part of the overcurrent limiting body is connected to the second power feeding element.

  If it is such, it will be set as the structure which connects a 1st electric power feeding element and a 2nd electric power feeding element using an insulating member, and vibrates integrally, In that structure, an overcurrent limiting body is made into the 1st electric power feeding element and Since it is connected to the second power feeding element, the vibrations on both sides of the overcurrent limiting body coincide with each other, or the deviation of the vibrations on both sides is reduced. Therefore, it is possible to reduce the stress associated with the vibration generated in the overcurrent limiting body, and to prevent the overcurrent limiting body from failing.

  Here, the insulating member may have an insulating function as a whole by forming a part of the member from an insulating material, in addition to the insulating member formed of an insulating material and having an insulating function. In addition, when connecting an insulating member to one electrode structure and one electric power feeding member by welding etc., it is desirable to provide a metal connection part in the both ends of an insulating member.

  Further, the HID lamp according to the present invention includes a pair of electrode structures in which an arc tube in which a luminescent material is sealed is disposed opposite to one end portion inside the arc tube and the other end portion extends outside the arc tube. And a pair of power supply members that introduce external power into the pair of electrode structures, and an insulating member that connects the one electrode structure and one power supply member that introduces power into the one electrode structure And an overcurrent limiter partly connected to the one electrode structure and the other part connected to the one power supply member.

  If it is such, it will be set as the structure which connects one electrode structure and one electric power feeding member using an insulating member, and vibrates integrally, In that structure, an overcurrent limiting body is made into one electrode structure and one Therefore, the vibrations on both sides of the overcurrent limiting body coincide with each other, or the deviation of the vibrations on both sides is reduced. Therefore, it is possible to reduce the stress associated with the vibration generated in the overcurrent limiting body, and to prevent the overcurrent limiting body from failing.

  It is desirable that the insulating member connect a part of the one electrode structure and a part of the power supply member. If this is the case, the electrode structure and the power supply member can be more firmly integrated, and the stress applied to the overcurrent limiting body can be reduced to further prevent the overcurrent limiting body from failing. Moreover, since a part of electrode structure and a part of electric power feeding member are connected, an insulating member can be reduced in size.

  Further, the HID lamp according to the present invention includes a pair of electrode structures in which an arc tube in which a luminescent material is sealed is disposed opposite to one end portion inside the arc tube and the other end portion extends outside the arc tube. And a pair of power supply members for introducing electric power from outside to the pair of electrode structures, the one power supply member has a first power supply body and a second power supply body, The first power feeding body and the second power feeding body are connected by an insulating member, a part of an overcurrent limiting body is connected to the first power feeding body, and the second power feeding body is connected to the second power feeding body. The other part of the overcurrent limiting body is connected. Note that the first power supply and the second power supply have the same potential.

  If it is such, it is set as the structure which vibrates integrally by connecting the 1st electric power feeding body and the 2nd electric power feeding body using an insulating member, In the structure, an overcurrent limiting body is made into the 1st electric power feeding body. And since it connects to the 2nd electric power feeder, the vibration on both sides of an overcurrent limiting body corresponds, or the shift | offset | difference of the vibration of both sides is reduced. Therefore, it is possible to reduce the stress associated with the vibration generated in the overcurrent limiting body, and to prevent the overcurrent limiting body from failing.

  It is desirable that the insulating member connects an end portion of the first power feeding body and an end portion of the second power feeding body. If this is the case, the first power supply body and the second power supply body can be more firmly integrated, and the stress applied to the overcurrent limiting body can be reduced to further prevent the overcurrent limiting body from failing. it can.

  The overcurrent limiting body may be made of a metal wire and configured to melt itself by heat generation when a lamp current exceeding a predetermined threshold current flows. If it is this, the structure of an overcurrent limiting body can be simplified.

  The predetermined threshold current can be set by selecting the material of the metal wire, its cross-sectional area, cross-sectional shape, length, and the like. Here, when the metal wire is set to a desired length, the metal wire may come into contact with surrounding structures simply by connecting the metal wire. For this reason, it is desirable that the metal wire is provided so as to surround the periphery of the insulating member. If this is the case, contact between the metal wire and the surrounding structure can be prevented, and the metal wire can be arranged compactly.

  It is preferable that the luminescent material is a metal halide, the arc tube is made of a translucent ceramic, and the HID lamp is a ceramic metal halide lamp.

  According to the present invention configured as described above, the stress applied to the overcurrent limiting body can be reduced, and the overcurrent limiting body can be prevented from being damaged.

It is a figure which shows typically the structure of the metal halide lamp of this embodiment. It is the elements on larger scale of the overcurrent limiting body and its periphery structure of the embodiment. It is a figure which shows the vibration test result of a ceramic metal halide lamp. It is a figure which shows typically the structure of the metal halide lamp of deformation | transformation embodiment. It is a figure which shows typically the overcurrent limiting body and its periphery structure of deformation | transformation embodiment. It is a figure which shows typically the structure of the conventional metal halide lamp.

  An embodiment of an HID lamp according to the present invention will be described below with reference to the drawings.

  The HID lamp 1 of the present embodiment is a ceramic metal halide lamp provided with a light-emitting ceramic-made arc tube 2 to which a metal halide is added and enclosed.

  Specifically, as shown in FIG. 1, the ceramic metal halide lamp 1 is formed of a light-transmitting ceramic such as a light-transmitting alumina ceramic and has a light emitting material filled with a metal halide (not shown) as a light-emitting substance. It has a tube 2 and an outer tube 3 that accommodates the arc tube 2.

  The arc tube 2 has a pair of electrode structures 41 and 42 in which a distal end portion which is one end portion is disposed opposite to the inside of the arc tube 2 and a base end portion which is the other end portion extends to the outside of the arc tube 2. Is provided. Further, inside the outer tube 3, a pair of power supply members 51 and 52 for introducing electric power from the outside to the pair of electrode structures 41 and 42 are provided. In addition, with respect to the electrodes 41a and 42a provided at the distal ends of the pair of electrode structures 41 and 42, the constituent elements of the other electrode structures 41 and 42 other than the electrodes 41a and 42a and the pair of power supply members 51, 52 constitutes a pair of power feeding structures. In the following, the constituent elements of the electrode structure 41 other than the electrode 41a are first power supply elements, and one power supply member 51 is a second power supply element.

  As shown in FIG. 1, the arc tube 2 includes a straight tubular main pipe portion 21 that forms a discharge space S and a straight pipe having a smaller diameter than the main pipe portion 21 provided at both axial ends of the main pipe portion 21. A tubular narrow tube portion 22 is provided. In addition, the main pipe part 21 and the thin pipe part 22 of this embodiment are shape | molded by the translucent ceramic.

  The discharge space S formed inside the main tube section 21 is filled with a starting rare gas, a metal halide, and mercury (all not shown), and the tips of the pair of electrode structures 41, 42. The parts are arranged opposite to each other.

  The electrode structures 41 and 42 are inserted into the narrow tube portion 22 of the arc tube 2, the tip portion is disposed opposite to the inside of the main tube portion 21 of the arc tube 2, and the base end portion extends outside the narrow tube portion 22. Yes. And in each electrode structure 41 and 42, the electrode 41a and 42a which consist of heat resistant metals, such as tungsten, is provided in the front-end | tip part located inside the main pipe part 21. As shown in FIG. The electrode structures 41 and 42 include a pair of electrode cores made of a heat-resistant metal such as tungsten provided at the tip of the electrodes 41a and 42a, molybdenum wound around the electrode core in the narrow tube portion 22, and the like. A coil in a thin tube made of a heat-resistant metal, and an electric introduction body having corrosion resistance to a metal halide connected to the electrode core and extending from the thin tube portion 22 to the outside. The electrode structures 41 and 42 and the thin tube portion 22 are hermetically sealed.

  The outer tube 3 accommodates the arc tube 2 and has a base 31 for supplying power to a pair of electrode structures 41 and 42 provided on the arc tube 2. The outer tube 3 is made of transparent hard glass, and the central portion has, for example, a substantially oval shape. The inside of the outer tube 3 is sealed with a vacuum or an inert gas, and the base end portion (lower end portion in FIG. 1) of the outer tube 3 is hermetically sealed by a stem 32, and a base 31 is attached to the stem 32. It is attached.

  In addition, the outer tube 3 is provided with a pair of power feeding members 51 and 52 made of metal rods for supporting the arc tube 2 and feeding power to the pair of electrode structures 41 and 42 provided on the arc tube 2. ing.

  One power supply member 51 has a proximal end connected to the stem 32 and a distal end electrically connected to the one electrode structure 41. The other power feeding member 52 positions and supports the arc tube 2 at the central portion of the outer tube 3. The proximal end portion is connected to the stem 32 and the distal end portion is the distal end of the outer tube 3. Touch the side wall. The other power supply member 52 is structurally coupled and electrically connected to the other electrode structure 42 by welding or the like.

  Thus, as shown in FIGS. 1 and 2, the ceramic metal halide lamp 1 of the present embodiment connects one electrode structure 41 and one power supply member 51 that introduces electric power into the one electrode structure 41. An insulating member 6 and an overcurrent limiting body 7 that electrically connects one electrode structure 41 and one power supply member 51 are provided. In the present embodiment, of the pair of electrode structures 41, 42, one electrode structure 41 located on the base side and one power supply member 51 that supplies power to the one electrode structure 41 The insulating member 6 is arranged between them.

  Specifically, the insulating member 6 has a substantially columnar shape, and one end portion in the axial direction, which is a part of the insulating member 6, is a base end portion that is a part of one electrode structure 41 (specifically, an electrical introduction body). The other end in the axial direction, which is the other part, is connected to a tip part 51 x that is a part of one power supply member 51. In this way, the base end portion 41 x of one electrode structure 41 and the tip end portion 51 x of one power supply member 51 are connected via the insulating member 6. Thereby, the base end part 41x of one electrode structure 41 and the front-end | tip part 51x of one electric power feeding member 51 are connected by the insulating member 6, and it is comprised so that it may vibrate integrally.

  One end of the metal wire 7 is connected to the proximal end portion 41x of the one electrode structure 41 or the vicinity thereof, and the other end portion of the metal wire 7 is connected to the distal end portion 51x of the power supply member 51 or the vicinity thereof. become. That is, the insulating member 6 and the metal wire 7 are structurally arranged in parallel. Thereby, the base end part 41x of one electrode structure 41, the front-end | tip part 51x of one electric power feeding member 51, the insulating member 6, and the metal wire 7 are comprised so that it may vibrate integrally.

  Here, the metal wire 7 is provided so as to surround the periphery of the insulating member 6. Since the metal wire 7 is designed so as to blow against a predetermined threshold current, the material of the metal wire, its cross-sectional area, cross-sectional shape, length, and the like are defined. For this reason, simply connecting to one electrode structure 41 and the power supply member 51 causes the curved portion of the metal wire 7 to swell outward from the insulating member 6, and contacts the peripheral member, or arrangement of the peripheral member. It becomes necessary to change. For these reasons, in the present embodiment, the metal wire 7 is configured so as to surround the insulating member 6, that is, arranged in a spirally wound state around the insulating member 6. With this configuration, the metal wire 7 can be compactly disposed around the insulating member 6, contact with the peripheral member can be prevented, or change in the disposition of the peripheral member can be made unnecessary.

  Next, FIG. 3 shows the vibration test results of the ceramic metal halide lamp 1 of the present embodiment and the conventional ceramic metal halide lamp. In addition, as shown in FIG. 6, the conventional ceramic metal halide lamp is one in which one electrode structure and one power supply member are connected only by a metal wire without being connected by an insulating member.

  In the conventional ceramic metal halide lamp, when a vibration of 25 Hz to 70 Hz is applied, the fuse which is a metal wire is broken in 18.2 hours. On the other hand, in the ceramic metal halide lamp 1 of the present embodiment, when a vibration of 25 Hz to 70 Hz is applied, the fuse that is the metal wire does not break even after 100.1 hours have passed. As described above, in the present embodiment, one electrode structure and one power supply member are structurally integrated by the insulating member, and the structure and the metal wire vibrate together. Is less likely to cause stress and the fuse is less likely to break.

  According to the HID lamp 1 according to the present embodiment configured as described above, one electrode structure 41 and one power supply member 51 are connected using the insulating member 6 to vibrate integrally. Since the metal wire 7 which is an overcurrent limiting body is connected to the one electrode structure 41 and the one power supply member 51, the vibrations on both sides of the metal wire 7 coincide or the vibration deviation on both sides is reduced. Is done. Therefore, the stress accompanying the vibration generated in the metal wire 7 can be reduced, failure such as breakage of the metal wire 7 can be prevented, and the problem of lamp failure can be solved.

  Further, since the insulating member 6 connects the base end portion 41x of the one electrode structure 41 and the distal end portion 51x of the one power supply member 51, the one electrode structure 41 and the one power supply member 51 are connected. The stress applied to the metal wire 7 connected to the proximal end portion 41x of one electrode structure 41 or the vicinity thereof and the distal end portion 51x of the one power supply member 51 or the vicinity thereof is further increased. It can be further reduced and breakage due to metal fatigue can be further prevented.

  The present invention is not limited to the above embodiment.

  For example, in the above-described embodiment, the overcurrent limiting body 7 is provided and electrically connected between the one electrode structure 41 and the one power supply member 51 in the above-described embodiment, but as illustrated in FIG. In addition, the overcurrent limiter 7 may be provided on one power supply member 51. Specifically, one power supply member 51 has a first power supply body 511 on the electrode structure 41 side and a second power supply body 512 on the base 31 side, and this first power supply body 511. The second power supply body 512 may be electrically connected by the overcurrent limiting body 7. Then, the first power supply body 511 and the second power supply body 512 are connected by the insulating member 6 so that the first power supply body 511 and the second power supply body 512 are vibrated integrally. Even if it is such, there exists an effect similar to the said embodiment.

  Moreover, in the said embodiment, although it has set as the structure which provides the overcurrent limiting body 7 between the one electrode structure 41 and the one electric power feeding member 51, and is electrically connected, it is set as the other electrode structure 42 and the other electric power feeding. An overcurrent limiting body 7 may be provided between the members 52 to be electrically connected.

  Moreover, in the said embodiment, although the insulating member 6 connected the base end part 41x of one electrode structure 41, and the front-end | tip part 51x of one electric power feeding member 51, as shown to FIG. 5 (A). In addition, portions other than the end portions may be connected. In this case, it is conceivable to connect the end portions with a metal wire 7. Further, as shown in FIG. 5B, one of the end portions may be connected to a portion other than the other end portion. In both cases of FIGS. 5A and 5B, both vibrate together, so that the stress applied to the overcurrent limiting body 7 can be reduced to prevent breakage. FIG. 5B shows a case where one electrode structure 41 and one power supply member 51 are not coaxial.

  In the above embodiment, a fusing line (current fuse) made of a metal wire is used as the overcurrent limiting body. However, when an excessive current exceeding the threshold current flows, means other than fusing An overcurrent limiting means for interrupting the circuit may be used. Also, in order to prevent the arc tube from being damaged, it is sufficient to suppress an excessive current to less than a normal current, and an excessive current that suppresses this current when an excessive current exceeding the threshold current flows. Suppressing means can also be used. Even when a metal wire is not used in this way, the stress applied to the connecting portion between the overcurrent limiting means or the overcurrent suppressing means and one of the electrode structures or the power supply member, or the overcurrent limiting means or the overcurrent By reducing the stress applied to the suppression means, it is possible to prevent breakage of the connecting portion and failure of the overcurrent limiting means or the overcurrent suppression means.

  Furthermore, although the said embodiment demonstrated the case where it applied to metal halide lamps, such as a ceramic metal halide lamp among HID lamps, it can also be applied to a high pressure sodium lamp and a high pressure mercury lamp.

  In addition, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

1 ... HID lamp (ceramic metal halide lamp)
2 ... arc tube 21 ... main tube portion 22 ... thin tube portion 3 ... outer tube 41, 42 ... pair of electrode structures 41x ... end portions 51, 52 of the electrode structures ..Feeding member 51x: end 6 of feeding member ... insulating member 7 ... overcurrent limiter (metal wire)

Claims (8)

An arc tube with a luminescent material sealed inside,
A pair of electrodes opposed to each other inside the arc tube;
A pair of feeding structures for introducing power to the pair of electrodes,
The one power feeding structure has a first power feeding element and a second power feeding element connected by an insulating member,
A HID lamp in which a part of the overcurrent limiting body is connected to the first power feeding element, and the other part of the overcurrent limiting body is connected to the second power feeding element. An arc tube with a luminescent material sealed inside,
A pair of electrode structures in which one end portion is disposed opposite to the inside of the arc tube and the other end portion extends to the outside of the arc tube;
A pair of power supply members for introducing external power into the pair of electrode structures;
An insulating member that connects the one electrode structure and one power supply member that introduces electric power to the one electrode structure;
An HID lamp comprising: an overcurrent limiter partly connected to the one electrode structure and the other part connected to the one power supply member.   The HID lamp according to claim 2, wherein the insulating member connects a part of the one electrode structure and a part of the power feeding member. An arc tube with a luminescent material sealed inside,
A pair of electrode structures in which one end portion is disposed opposite to the inside of the arc tube and the other end portion extends to the outside of the arc tube;
A pair of power supply members for introducing electric power from the outside to the pair of electrode structures,
The one power feeding member has a first power feeding body and a second power feeding body,
The first power feeder and the second power feeder are connected by an insulating member;
A HID lamp in which a part of an overcurrent limiting body is connected to the first power supply body and the other part of the overcurrent limiting body is connected to the second power supply body.   The HID lamp according to claim 4, wherein the insulating member connects a part of the first power feeding body and a part of the second power feeding body.   The HID lamp according to claim 1, wherein the overcurrent limiting body is made of a metal wire.   The HID lamp according to claim 6, wherein the metal wire is provided so as to surround a periphery of the insulating member.   The HID lamp according to claim 1, wherein the luminescent material is a metal halide.