JP2010176898A - Ultra high pressure discharge lamp - Google Patents

Abstract

An ultra high pressure discharge lamp that does not use a radioactive substance, has a simple structure, is low in cost, and is suitable for use in an apparatus such as a projector.
An arc tube portion 26 having a pair of electrodes 34a and 34b disposed so as to be opposed to each other and filled with a luminescent material, and sealing portions 28a and 28b projecting from both ends of the arc tube portion 26 are provided. The trigger wire 15 having one end 15a attached to the external lead-out end K1a of the energizing member K1 and the end 15b disposed in the vicinity of the arc tube portion 26, The trigger wire 15 is made of a different metal, and its one end portion 16a is joined to the trigger wire 15, and the other end portion 16b derived from the joint portion S has a proximity position T1 of the other end portion 15b of the trigger wire 15. It has a lead wire 16 extending to the other sealing portion 28b side, and emitters E1 and E2 provided at proximity positions T1 between the trigger wire 15 and the lead wire 16, respectively.
[Selection] Figure 1

Description

  The present invention relates to an improvement of an ultrahigh pressure discharge lamp that is suitably used in a dark room like a projector.

  The high pressure discharge lamp includes an arc tube portion in which mercury or other necessary substances or gases are sealed in an internal space, and a sealing portion that extends from both sides of the arc tube portion and seals the internal space of the arc tube portion. As the amount of mercury vapor enclosed in the arc tube portion and evaporated at the time of lighting increases, the amount of light emitted from the arc tube portion increases. For this reason, mercury is sealed in the arc tube part in combination with improvements in the mechanical properties and sealing technology of the glass constituting the envelope for the purpose of improving the brightness of the projection surface by emitting more light. Increasingly, the amount is gradually enclosed, and has recently entered the era of ultra-high pressure discharge lamps.

  The starting lighting and the subsequent light emission of such an ultra-high pressure discharge lamp cause a dielectric breakdown between the electrodes by applying a high starting voltage between a pair of electrodes, and light is emitted by an arc formed by this dielectric breakdown. This is done by evaporating the mercury enclosed in the tube and exciting it. However, if the amount of mercury enclosed in the arc tube is increased as described above, the lighted ultra high pressure discharge lamp is turned off. As the ultra-high pressure discharge lamp is cooled, mercury fine particles cool and aggregate on the electrode surface, which inhibits arc generation during re-lighting. As a result, it was necessary to apply a higher starting voltage between the electrodes at the time of re-lighting than when the mercury filling amount was small. In other words, the startability of the ultra-high pressure discharge lamp deteriorates as the amount of enclosed mercury increases, so a high voltage of several tens of kV has to be applied to improve the startability, which causes noise that impedes electronic equipment. Therefore, it has been required to improve the high voltage application at the time of starting, and as a result of earnest improvement, it has been improved by seeing a decrease in the starting voltage to 5 kV, and recently 2 kV.

  When an ultra-high pressure discharge lamp with a starting voltage reduction measure is used for a projector, for example, the above-mentioned reduced starting voltage does not cause dielectric breakdown between the electrodes, and it is difficult to relight the projector. A fatal phenomenon occurred as a light source. The reason is as follows. The interior of the projector equipped with the ultra-high pressure mercury lamp is in a completely dark room when not lit. As a result, electrons in the arc tube portion disappear, and dielectric breakdown between the electrodes does not occur only by applying a reduced starting voltage at the time of relighting.

  One solution to this problem is the introduction of a very small amount of radioactive material into the arc tube section to continuously maintain self-ionization and to easily cause dielectric breakdown during re-lighting, as well as ultraviolet rays. Another small lamp to be released is mounted in close proximity to the ultra high pressure discharge lamp. When it is turned on again, it is turned on, and the ultraviolet rays emitted from the lamp are used to promote ionization in the arc tube of the ultra high pressure discharge lamp. As shown in FIG. 3, the ultrahigh pressure discharge lamp 1 has an inert gas sealed space 5a between the inner peripheral surfaces of the sealing portions 3a and 3b of the envelope container 2 and the metal foils 4a and 4b. , 5b, and a conductor 6 is disposed on the outer periphery of one sealing portion 3a, which is further pulled out and connected to the external lead bar 7b of the other sealing portion 3b for lighting or re-lighting Sometimes reduced between the metal foil 4a and the conductor 6 in one sealing part 3a. However, a starting voltage higher than that of steady lighting is applied to cause a discharge between the metal foil 4a and the conductor 6, and electrons are emitted from the surfaces of the electrodes 8a and 8b by the ultraviolet rays generated at that time. A technique for easily causing dielectric breakdown between the electrodes 8a and 8b has been proposed (Patent Document 1).

Special Table 2003-526182

  The environment surrounding the industry is rapidly advancing toward the environment and cost, and the use of radioactive materials like the former is regarded as a problem from the point of environmental pollution, even in trace amounts, Although the technology of forming an inert gas sealing space in a small lamp or in a sealed part is effective, it requires additional parts and special processing of the sealed part, which has to be expensive in terms of cost. It is becoming unacceptable as a product in terms of competitiveness. The present invention has been made in order to adapt to such changes in the times, and the problem is that it does not use environmental pollutants, has a simple structure, and can maintain international competitiveness in a cost-effective manner. This is to develop a new ultra-high pressure discharge lamp suitable for use in a device that is in a dark room state when the lighting environment is not lit.

Claim 1 is a first embodiment of the present invention [FIG.
A light-emitting tube portion 26 having a light-emitting space 27 filled with a light-emitting substance and having a pair of electrodes 34 a and 34 b disposed facing each other in the light-emitting space 27, and from both ends of the light-emitting tube portion 26 Sealing portions that are integrally protruded and are respectively embedded in the energizing members K1 and K2 that are embedded in the inside and led out to the outside, and in which the base ends of the pair of electrodes 34a and 34b are attached An ultra high pressure discharge lamp 10 composed of 28a and 28b,
The trigger wire 15 whose one end 15a is attached to the external lead-out end K1a of the energizing member K1 led out from one sealing portion 28a, and whose other end 15b is disposed in the vicinity of the arc tube portion 26,
The trigger wire 15 is made of a different metal, and its one end portion 16a is joined to the trigger wire 15, and the other end portion 16b derived from the joint portion S has a proximity position T1 of the other end portion 15b of the trigger wire 15. A lead wire 16 extending through to the other sealing portion 28b side;
An ultra high pressure discharge lamp 10 having emitters E1 and E2 provided at proximity positions T1 between a trigger wire 15 and a lead wire 16, respectively.

Claim 2 is the second embodiment of the present invention [FIG. 1 (b)].
A light-emitting tube portion 26 having a light-emitting space 27 filled with a light-emitting substance and having a pair of electrodes 34 a and 34 b disposed facing each other in the light-emitting space 27, and from both ends of the light-emitting tube portion 26 Sealing portions that are integrally protruded and are respectively embedded in the energizing members K1 and K2 that are embedded in the inside and led out to the outside, and in which the base ends of the pair of electrodes 34a and 34b are attached An ultra high pressure discharge lamp 10 composed of 28a and 28b,
The trigger wire 15 whose one end 15a is attached to the external lead-out end K1a of the energizing member K1 led out from one sealing portion 28a, and whose other end 15b is disposed in the vicinity of the arc tube portion 26,
A lead composed of a metal different from the trigger wire 15, one end portion 16 a of which is joined to the trigger wire 15, and the other end portion 16 b led out from the joint portion S is extended to the other sealing portion 28 b side. Line 16;
It has a trigger wire 15 led out in the vicinity of the joint S, projecting portions 15c and 16c of the lead wire 16, and emitters E1 and E2 provided on the projecting portions 15c and 16c, respectively. This is a high pressure discharge lamp 10.

Claim 3 is the third embodiment of the present invention [FIG. 2].
A light-emitting tube portion 26 having a light-emitting space 27 filled with a light-emitting substance and having a pair of electrodes 34 a and 34 b disposed facing each other in the light-emitting space 27, and from both ends of the light-emitting tube portion 26 Sealing portions that are integrally protruded and are respectively embedded in the energizing members K1 and K2 that are embedded in the inside and led out to the outside, and in which the base ends of the pair of electrodes 34a and 34b are attached An ultra high pressure discharge lamp 10 composed of 28a and 28b,
The trigger wire 15 whose one end 15a is attached to the external lead-out end K1a of the energizing member K1 led out from one sealing portion 28a, and whose other end 15b is disposed in the vicinity of the arc tube portion 26,
One end portion 18a is joined to the trigger wire 15, and the other end portion 18b led out from the joint portion S is extended to the other sealing portion 28b side,
The trigger wire 15 is made of a different metal, and its one end portion 16P is joined to the trigger wire 15, and the other end portion 16Q derived from the joint portion S is at a position T1 in the vicinity of the other end portion 15b of the trigger wire 15. An emitter lead wire 16 'disposed;
The ultrahigh pressure discharge lamp 10 has emitters E1 and E2 provided at proximity positions T1 between the trigger wire 15 and the emitter lead wire 16 ′.

  According to the present invention, it has an international competitiveness without using a radioactive substance, and can be lit at a low starting voltage even in a use space where the storage space becomes a dark room when not lit, such as a projector. We were able to develop an ultra-high pressure discharge lamp that could be resumed.

It is a front view of the 1st and 2nd examples of the present invention. It is a front view of 3rd Example of this invention. It is sectional drawing of a prior art example.

  Hereinafter, an ultrahigh pressure discharge lamp 10 to which the present invention is applied will be described with reference to FIGS. The main part of the discharge lamp of the super high pressure discharge lamp 10 of the present invention (first to third embodiments) is roughly a spherical light emitting tube portion 26 having an internal space and a pair of left and right sealing portions extending from both sides of the light emitting tube portion 26. The sealing container 12 made of quartz glass, which is provided with 28a and 28b and hardly causes thermal expansion and contraction, and the joining portions of the metal foils 32a and 32b and the metal foils 32a and 32b are the sealing portions 28a and 28b. In the case of the first embodiment shown in FIG. 1 (a), the trigger wire 15 and leads arranged along the envelope container 12 are constituted by a pair of mounts 14a and 14b embedded therein. In the case of the second embodiment shown in FIG. 1 (b), the wire 16 and the emitters E1 and E2 attached thereto are led out close to the joint S between the trigger wire 15 and the lead wire 16. Protruding portions 15c, 16c, and The third embodiment shown in FIG. 2 includes the trigger wire 15 and the auxiliary wire 18, the emitter lead wire 16 ′, and the emitters E1 and E2. Yes.

  In each of the arc tube portions 26 shown in the first to third embodiments, Ar and other necessary gases, mercury, halides and other necessary substances are sealed in the internal space 27 thereof. However, radioactive materials such as krypton 85 and thorium oxide are not enclosed. Further, a pair of electrodes 34 a and 34 b are disposed opposite to each other in the space 27. The electrodes 34a and 34b have the same shape in the case of alternating current, but in the case of direct current, the electrodes 34a and 34b are larger in volume on the anode side than on the cathode side. 1 and 2 are both for direct current, and this will be described as a representative example, but naturally, the present invention includes alternating current.

  The embodiment shown in the figure is for direct current, and the cathode side electrode 34a has a tungsten wire wound around the tip of a tungsten rod, and its base portion passes through the tube wall of the arc tube portion 26 to reach the inside of the sealing portion 28a, and is embedded in that portion. In contrast, the anode side electrode 34b made of tungsten has a hemispherical and large diameter portion facing the cathode side electrode 34a, and the narrow leg portion is the tube wall of the arc tube portion 26. It passes through the sealing part 28b and is buried in the part.

  Each of the mounts 14a and 14b is made of molybdenum metal foils 32a and 32b, electrodes 34a and 34b having small-diameter legs attached to one end of the metal foils 32a and 32b, and welded ends of the metal foils 32a and 32b. It consists of molybdenum external lead rods 36a and 36b attached to the other end, and the metal foils 32a and 32b and the external lead rods 36 and 36b constitute energizing members K1 and K2. The metal foils 32a and 32b, the small-diameter leg portions of the electrodes 34a and 34b joined to the metal foils 32a and 32b, and the joining side end portions of the external lead rods 36a and 36b are embedded in the sealing portions 28a and 28b. The tip portions of the electrodes 34a and 34b are arranged to face each other in the arc tube portion 26, and the non-joining side ends of the external lead rods 36a and 36b are drawn out from the sealing portions 28a and 28b. Yes. The lead-out portions are the external lead-out ends K1a and K2b of the energizing members K1 and K2.

  In the first and second embodiments shown in FIG. 1, the trigger wire 15 and the lead wire 16 are used, and in the third embodiment shown in FIG. 2, the trigger wire 15 and the emitter lead wire 16 ′ are made of different metals at one end thereof. When joining and integration are performed, a material is selected such that a potential difference is generated between adjacent portions of the two (for example, between the other tips close to each other). In the present invention, a nickel wire is used as the trigger wire for the iron-chromium alloy, the lead wire 16 or the emitter lead wire 16 ′, but is not limited thereto. Although the joining method is preferably by welding, it is not limited to this, and it is sufficient that the electrical continuity is satisfied, and it is needless to say that joining may be performed by means such as winding.

  One end 15a of the trigger wire 15 of the present invention is attached by, for example, winding to an external lead-out end K1a led out from the cathode-side sealing portion 28a when the ultra-high pressure discharge lamp 10 is for direct current, The other end 15b drawn out from the winding portion 15a1 is disposed in the vicinity of the arc tube portion 26, and the tip end portion of the other end portion 15b is wound around the boundary portion between the sealing portion 28a and the arc tube portion 26. The winding end 15d protrudes away from the sealing portion 28a.

  In the illustrated embodiment, a short winding end 15d is drawn out from the winding portion 15a1 of the trigger wire 15 in a protruding shape. This portion is referred to as a protruding portion 15c. Of course, the method of attaching the trigger wire 15 is not limited to this, and a portion corresponding to the winding portion 15a1 may be joined to the external lead-out end K1a by welding, and in any case, electrical continuity is ensured. I can do it. Although not shown, if the mechanical strength of the trigger wire 15 is sufficiently strong, the tip end portion of the other end portion 15b may be simply placed close to the boundary portion without being wound around the boundary portion.

  1 is joined to the winding portion 15a1 of the trigger wire 15 by metallurgical joining such as spot welding, and adjacent to the short protruding portion 15c of the trigger wire 15 from the joining portion S. Thus, the short protruding portion 16c is led out and arranged in a protruding shape. The proximity part of both is indicated by the proximity position T2. Then, the other end portion 16b is drawn from the joint portion S of the lead wire 16 along the sealing portion 32a and toward the winding end 15d of the trigger wire 15, and reaches the arc tube portion 26 at a proximity position T1 of the winding end 15d. It is curved and deformed so as to extend along the other sealing portion 28b as it is.

  Emitters E1 and E2 used in the present invention are high-efficiency emission materials such as carbon nanotubes, boron nitride, or aluminum nitride. If the emitters E1 and E2 are arranged close to each other and there is a slight potential difference between the attached portions, the minus side to the plus side In the embodiment shown in FIG. 1 (a), the winding end 15d of the trigger wire 15 and the bending deformation of the lead wire 16 proximate to this at the proximity position T1 are released. These are applied to the part. Of course, if the ionizing effect can be obtained without being limited to the above-mentioned portions, it is possible to apply to the facing portions or the whole of both 15 and 16, and the proximity positions T1 and T2 are only the tip portion and the bent portion as shown in the figure. This is a concept including a position where an ionizing effect can be obtained. This point applies throughout this specification.

  Thus, in order to relight the ultra high pressure discharge lamp 10 mounted inside the projector in the dark room state, the starting members (for example, an applied voltage of about 1.5 kV) further reduced compared to the conventional case are applied to the energizing members K1, K2. When applied to, a slight potential difference is generated between the trigger wire 15 which is a dissimilar metal and the lead wire 16 at the proximity position T1. Even if the ultra high pressure discharge lamp 10 is installed in a device such as a projector and the electrons in the arc tube portion 26 are completely lost during the non-lighting state, the trigger wire 15 and the Electrons are emitted between the emitters E1 and E2 provided in the proximity position T1 with the lead wire 16 to cause an ionization phenomenon. This causes the same phenomenon as conventional ionization by radioactive materials and ionization by ultraviolet rays from small lamps, etc., and causes dielectric breakdown between the electrodes 34a and 34b at a low starting voltage without using radioactive materials or small lamps. It was possible to re-light easily even under conditions that were bad for re-lighting such as in a dark room. Although this point is estimated to be continuous in the case of direct current and alternating (intermittent) in the case of alternating current direct current, the same effect was obtained regardless of the alternating current. Note that the lead wire 16 of nickel wire bonded to the dissimilar metal works on the minus side, and the trigger wire 15 made of iron-chromium alloy works on the plus side of the lead wire 16.

  FIG. 1B shows the second embodiment, but the proximity position T2 is far from the arc tube portion 26 as compared with the first embodiment, but the same effect as in the first embodiment can be obtained.

  FIG. 2 shows a third embodiment of the present invention. In the first and second embodiments, the lead wire 16 is also used for applying the emitter E1, but in the case of FIG. 2, an emitter lead wire 16 'is prepared separately. It is. Here, the lead wire 16 ′ for the emitter is made of the same material as the lead wire 16 (in this case, nickel). However, the emitter lead wire 16 ′ is not limited to this. Another material may be used. Since the emitter lead wire 16 ′ is prepared in the embodiment of FIG. 2, the auxiliary wire 18 has a shape corresponding to the lead wire 16 of the first embodiment. The auxiliary wire 18 was made of the same material as the emitter lead wire 16 ′, and was joined to the winding portion 15 a 1 of the trigger wire 15 by spot welding or winding at an intermediate portion. In a separate member from the emitter lead wire 16 ′, the end portions of the emitter lead wire 16 ′ and the auxiliary wire 18 are joined to the winding portion 15 a 1 of the trigger wire 15 by spot welding or winding. The relighting action of the second embodiment is the same as that of the first embodiment.

  The ultra-high pressure discharge lamp of the present invention can be stably lit again at a low starting voltage in a dark room condition such as in a projector without using a radioactive material or a small lamp. It can be said that it has high applicability as an alternative to an ultra-high pressure discharge lamp using a conventional radioactive substance or a small lamp.

10 Ultra High Pressure Discharge Lamp 15 Trigger Wire 15a Trigger Wire One End 15b Trigger Wire Other End 16 Lead Wire 16a Lead Wire One End 16b Lead Wire Other End 15c, 16c Trigger Wire and Lead Wire Protrusion 16 'Emitter lead wire 16P One end portion 16Q of the Emic lead wire The other end portion 18 of the emitter lead wire led out from the joint portion 18 Auxiliary wire 18a One end portion 18b of the auxiliary wire The other end portion 26 of the auxiliary wire Portion 27 Light emitting space 28a, 28b Sealing portion 34a, 34b Electrode E1, E2 Emitter K1, K2 Current-carrying member K1a, K2b Current lead-out end S of current-carrying member S Joint T1, T2 Proximity position between trigger wire and lead wire

Claims (3)

A light-emitting tube portion having a light-emitting space filled with a light-emitting substance and having a pair of electrodes disposed opposite to each other in the light-emitting space, and projecting integrally from both ends of the light-emitting tube portion And an ultra-high pressure discharge lamp constituted by a sealing portion in which the base end portions of the pair of electrodes are attached to an energizing member embedded in the interior and one end portion thereof led out to the outside,
A trigger wire whose one end is attached to the external lead-out end of the energizing member led out from one sealing portion, and the other end is arranged in the vicinity of the arc tube portion;
Consists of a metal different from the trigger wire, one end of which is joined to the trigger wire, and the other end led out of the joint passes through the proximity position of the other end of the trigger wire and the other sealing part side A lead wire extending to
An ultra-high pressure discharge lamp having an emitter provided at each of adjacent positions of a trigger wire and a lead wire. A light-emitting tube portion having a light-emitting space filled with a light-emitting substance and having a pair of electrodes disposed opposite to each other in the light-emitting space, and projecting integrally from both ends of the light-emitting tube portion And an ultra-high pressure discharge lamp constituted by a sealing portion in which the base end portions of the pair of electrodes are attached to an energizing member embedded in the interior and one end portion thereof led out to the outside,
A trigger wire whose one end is attached to the external lead-out end of the energizing member led out from one sealing portion, and the other end is arranged in the vicinity of the arc tube portion;
A lead wire composed of a metal different from the trigger wire, one end portion of which is joined to the trigger wire, and the other end portion led out from the joint portion is extended to the other sealing portion side,
An ultra-high pressure discharge lamp comprising a trigger wire led out in the vicinity of the joint, a protruding portion of a lead wire, and an emitter provided in each protruding portion. A light-emitting tube portion having a light-emitting space filled with a light-emitting substance and having a pair of electrodes disposed opposite to each other in the light-emitting space, and projecting integrally from both ends of the light-emitting tube portion And an ultra-high pressure discharge lamp constituted by a sealing portion in which the base end portions of the pair of electrodes are attached to an energizing member embedded in the interior and one end portion thereof led out to the outside,
A trigger wire whose one end is attached to the external lead-out end of the energizing member led out from one sealing portion, and the other end is arranged in the vicinity of the arc tube portion;
One end of the auxiliary wire is joined to the trigger wire, and the other end led out from the joined portion is extended to the other sealing portion,
An emitter lead wire that is composed of a metal different from the trigger wire, one end portion of which is joined to the trigger wire, and the other end portion that is led out from the joint portion is disposed in the vicinity of the other end portion of the trigger wire. ,
An ultra-high pressure discharge lamp having an emitter provided at each position adjacent to the trigger wire and the emitter lead wire.

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