JPH1196968A - High-pressure discharge lamp and lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove hydrogen and oxygen remaining in a discharge container satisfactorily. SOLUTION: A feeding conductor 103, consisting of a sealable part 103a and a halide-resistant part 103b, being inserted into each of end parts 101b on both sides of a translucent ceramic discharge container 101, an electrode 104 being disposed on a tip of the halide-resistant part, a gap between the end part and the sealable part being sealed airtightly with a seal 106 of a compound for ceramic sealing, and a hydrogen-and-oxygen getter 105 is disposed near a base end part of the halide-resistant part. The position of the hydrogen- and-oxygen getter is optimum for getter action and a hydrogen-and-oxygen permeable part of the feeding conductor is prevented from acting as getter, and therefore the feeding conductor is prevented from being embrittled by absorbing hydrogen and oxygen, and its sealed state is not damaged. The hydrogen-and-oxygen getter is supported by a ceramic sleeve 102 inserted between the feeding conductor and the end part of the discharge container or the halide-resistant part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure discharge lamp provided with a ceramic discharge vessel and a lighting device using the same.

[0002]

2. Description of the Related Art A high-pressure discharge lamp provided with a discharge vessel made of a light-transmitting ceramic such as light-transmitting alumina has excellent heat resistance and corrosion resistance as compared with quartz glass. And dysprosium Dy
It is expected that the devitrification phenomenon due to the reaction with a light emitting metal such as sodium and sodium Na is small, and therefore, the decrease in the luminous flux accompanying this can be suppressed.

On the other hand, moisture, that is, oxygen and hydrogen easily enter the discharge space together with the metal halide, and if these impurities are present in the discharge vessel, it is difficult to cause discharge or to promote the reaction with tungsten. There are adverse effects. In order to eliminate these problems, Japanese Patent Application Laid-Open No. 6-196131 proposes a configuration shown in FIG.

FIG. 7 is a sectional view showing a conventional high-pressure discharge lamp.

[0005] This conventional high-pressure discharge lamp has the following configuration.

[0006] That is, there is provided a ceramic discharge vessel 10 made of alumina ceramic, which surrounds a discharge cavity 11 and contains an ionizable filling containing a metal halide. The packing in this case consists of 1 mg of mercury and 3 mg of a metal halide consisting of 69:10:21 by weight of sodium iodide, thallium iodide and dysprosium iodide. The fill contains argon, a starting gas. The lamp exhibits spectral lines at 589 nm and 535 nm due to the first two metal halides, and also exhibits a number of spectral lines generated by the third metal halide component. Instead of dysprosium iodide, another rare earth halide can be used, such as scandium iodide, yttrium iodide, holmium iodide or thulium iodide. The fill may also be comprised of a halide that emits a continuous spectrum during operation, such as tin iodide. First and second electrodes 40a and 40b are arranged in the discharge vessel 10. Each electrode 40a, 40b is
A single wire made of tungsten having a diameter of 170 μm is formed by winding a free end of a tungsten rod having a length of 3 mm and a diameter of 300 μm over a distance of 800 μm. The discharge vessel 10 has a central section 20 extending between the electrodes 40a, 40b, and first and second cylindrical end sections 30a, 30b connected to both sides of the central section.
have. Each of these cylindrical end sections surrounds the power supply conductors 50a, 50b with a slight gap, and the power supply conductors connect to the respective electrodes 40a, 40b. Each end section is provided with a ceramic sealing compound seal 32a, 32b through which the associated power conductor 50a,
Take 50b out. The internal length of the central section 20 is 10
mm, the outer diameter was 7.6 mm, and the wall thickness was 0.8 mm. In this case, it is facing the central section 20,
And the tubes 30a 'forming the end sections 30a, 30b,
Each of the ends 31a, 31b of 30b 'is a ring 22a,
22b. Each ring 22 having a thickness of 2 mm
a, 22b are the ends 2 of the tube 20 'forming the central section 20
3a, 23b. The ends 31a, 31b, the rings 22a, 22b and the ends 23a, 23b of the central section form transitions interconnecting the end sections 30a, 30b and the central section 20. The outer diameter of the end sections 30a, 30b was smaller than the outer diameter of the central section 20, and these end sections were 2.6 mm here. End sections 30a, 30
The inner diameter D of b was about 0.76 mm. Each power supply conductor 50
a, 50b are directed toward the discharge space 11, and furthermore, the portions 51a, 551b formed by a halide-resistant molybdenum rod having a diameter of 0.70 mm and the opposite side to the discharge space, Moreover, it is composed of portions 52a and 52b formed of niobium rods having a thickness of 0.72 mm which are permeable to hydrogen and oxygen. End portions 30a, 30b
And the halide-resistant parts 51a, 51b passing therethrough
The average value of the gap between them was about 0.03 mm.

The halide-resistant parts 51a, 51b extend inside the end sections 30a, 30b over a distance L1 of 7 mm. This distance L1 is the inner diameter D of the end section 2 mm.
Make it larger than the incremented 2.76 mm. The halide-resistant portions 51a and 51b have roughened surfaces and are made to have a matte surface, so that the radiant absorption coefficient of the surfaces is set to 0.2.
And the absorption coefficient in this case was 0.22.

[0008] Hydrogen and oxygen permeable portions 52a, 52b
Extends over a distance L2 of 5 mm inside the end sections 30a, 30b. This distance is 3 times the inner diameter D of the end section.
Times (about 2-3 mm). The ceramic sealing compound seal 32a, 32b is such that the ends 54a, 54b of the permeable portions 52a, 52b are exposed over a length L3 and remain around the permeable portion inside the end sections for a distance of about 2 mm. To be provided.

The power consumption of the high-pressure discharge lamp at the time of nominal operation is 70 W, and as a result of a 5000-hour endurance test, almost no corrosion is found in the permeable portions 52a and 52b. It is stated that the ratio was 2 or less.

Further, in the above prior art, the inner end of the hydrogen and oxygen permeable portion is exposed from the ceramic sealing compound into the end portion in the first stage of the temporary sealing state, and the discharge vessel is heated. After absorbing the residual hydrogen and oxygen into the exposed portion of the permeable portion, as a second step, melting the ceramic sealing compound by reheating and coating the exposed portion of the permeable portion with the ceramic sealing compound. Are also described.

[0011]

In practice, a slight difference in the coefficient of thermal expansion between the hydrogen and oxygen permeable portions 52a, 52b and the seals 32a, 32b of the ceramic sealing compound cannot be avoided. . The transparent portion 52
In the state where a and 52b have ductility and malleability, the seals 32a and 32b provide required airtightness because the permeable portions 52a and 52b serve as a buffer.

However, the niobium forming the hydrogen and oxygen permeable portions 52a and 52b in the above-mentioned prior art has a property of losing ductility and malleability and embrittlement when a large amount of residual hydrogen and oxygen in the discharge space is adsorbed. is there. For this reason, there is a problem that the buffering effect on the compound for ceramic sealing is lost and airtightness cannot be maintained.

In the latter case, covering the internal exposed portion of niobium, which is a hydrogen and oxygen permeable portion, with the compound for ceramic encapsulation means simultaneously connecting at least the permeable portion of the halide-resistant portion. Base is covered with a ceramic sealing compound. Tungsten and molybdenum that make up the halide-resistant part have a smaller coefficient of thermal expansion than that of the halide-resistant part such as niobium. Is peeled off, and cracks are likely to occur in the second portion from the boundary between the permeable portion and the halide-resistant portion to the ceramic sealing compound and the end portion of the discharge vessel.

When the first portion is peeled off, the permeable portion is deteriorated by corrosion because the hydrogen and oxygen permeable portion comes into contact with the halide.

When a crack occurs in the second portion,
Leakage occurs and the airtightness of the discharge vessel is impaired.

According to the present invention, the removal of hydrogen and oxygen in the discharge vessel does not need to depend essentially on the hydrogen and oxygen permeable portions of the power supply conductor, and the hydrogen remaining in the discharge vessel due to the incorporation of a halide or the like. It is an object of the present invention to provide a high-pressure discharge lamp capable of satisfactorily removing oxygen and oxygen, and a lighting device using the same.

[0017]

According to the first aspect of the present invention, there is provided a high-pressure discharge lamp comprising a bulging portion surrounding a discharge space and an end portion having an inner diameter smaller than that of the bulging portion. A light-transmitting ceramic discharge vessel comprising: a sealing portion; and an end portion of the light-transmitting ceramic discharge container, comprising a halide-resistant portion having a base end connected to the distal end of the sealing portion. A power supply conductor penetrating through the inside and forming a slight gap between the power supply conductor and the end portion; an electrode disposed in the bulging portion and connected to the power supply conductor; sealing the end portion of the discharge vessel and the power supply conductor. A ceramic sealing compound to be attached; a hydrogen and oxygen getter disposed in at least one end portion near a base end of the halide-resistant portion; and a discharge sealed in the discharge space containing a metal halide. Medium; It is characterized in Rukoto.

In the present invention and each of the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.

"Ceramic discharge vessel" refers to a single crystal metal oxide, such as sapphire, and a polycrystalline metal oxide, such as translucent hermetic aluminum oxide (DGA),
Discharge vessel made of yttrium-aluminum-garnet (YAG) and yttrium oxide (YOX) and a refractory material such as a polycrystalline non-oxide such as aluminum nitride (AlN).

The term "light-transmitting property" means that light emitted by discharge only needs to be transmitted to the extent that it can be transmitted through the discharge vessel to the outside, and may be either transparent or diffuse light-transmitting.

To manufacture a ceramic discharge vessel, the bulge and the end portion can be integrally formed from the beginning. As a method different from this, the bulging portion is formed by a pair of end plates each having a central hole for closing both ends of the cylindrical body and the cylindrical body, and the end portion is formed by inserting an elongated tube into the central hole of the end plate. It may be formed, sintered and integrated.

The "power supply conductor" functions to apply a voltage between the electrodes from a power supply via ballast means to start a high-pressure discharge lamp, to introduce a current, and to light the lamp. A member that is hermetically sealed in the discharge vessel and connected to the electrode. In order to obtain good airtightness with the discharge vessel, the power supply conductor is composed of a sealing part and a halide-resistant part following the sealing part, and the sealing part is mainly made of ceramic at the end part of the discharge vessel. It is fixed via the seal of the sealing compound.

The term "sealing portion" means that the discharge vessel is sealed between its end portion and the sealing portion or by a ceramic sleeve further interposed therebetween by the sealing of the ceramic sealing compound. Any material that is suitable for such a purpose may be used, for example, titanium, zirconium, hafnium, vanadium, niobium and tantalum, or alloys thereof. The sealing portion may have any permeability to hydrogen and oxygen, but the material described above is the same as the hydrogen and oxygen permeable material as a result. However, the present invention is characterized in that the sealing portion is not used as a getter. When DGA is used for the discharge vessel, niobium and / or tantalum preferably have niobium and / or tantalum as the sealing portion because their average thermal expansion coefficients are almost the same as DGA. The difference is also small for yttrium oxide and YAG. When aluminum nitride is used as the ceramic discharge vessel, zirconium may be used as the sealing portion.

The term "halide-resistant part" means a part composed of a substance present in the discharge space vessel during the operation of the high-pressure discharge lamp and having little or no corrosive action due to the halide and free halogen. For example, a metal selected from the group consisting of tungsten, molybdenum, platinum, iridium, rhenium and rhodium, or a portion composed of at least one kind of silicide, carbide or nitride of these metals, May be coated with the above material.

The "small gap" means that the space formed between the power supply conductor and the inner surface of the end portion of the discharge vessel is at least 5 μm, and is at most a quarter of the inner diameter of the end portion. Means a space of about 200 μm or less. Therefore, the diameter of the halide-resistant portion of the power supply conductor penetrating the end portion is at least 1/2 of the inner diameter of the end portion.

The small gap can be formed by interposing a ceramic sleeve between the end portion and the power supply conductor. In this case, a slight gap is formed between the power supply conductor and the ceramic sleeve and between the ceramic sleeve and the inner surface of the end portion.

Further, a small gap may be formed between the rod and the outer peripheral surface of the coil wound around the rod and the inner surface of the end portion of the halide conductor of the power supply conductor.

In addition, a small gap is formed during operation of the high-pressure discharge lamp by excess halide entering in a liquefied state to form the coldest part. The desired coldest part temperature can be achieved.

The "ceramic sleeve" allows a sleeve made of the same material or cermet as the above-mentioned materials that can constitute the discharge vessel.

By using a ceramic sleeve,
It is easy to form a small gap. In addition, by providing the ceramic sleeve so as to surround the portion on the tip end side of the sealing portion of the power supply conductor, that is, in the vicinity of the boundary with the halide-resistant portion, good sealing can be obtained. Can be.

The "hydrogen and oxygen getter" is provided separately from the power supply conductor, and is provided at a halogen-resistant part, that is, a base located on the boundary side between the halide-resistant part and the sealing part. It is near the end.

The reasons for defining the hydrogen and oxygen getters in the above positions are as follows. That is, if the hydrogen and oxygen getters are disposed near the base end of the halide resistant portion, the getters can be easily maintained at a temperature of 400 to 750 ° C. effective for the getter function during operation of the high-pressure discharge lamp. is there. If the temperature is lower than 400 ° C., the effect of absorbing impurities is insufficient. If the temperature is higher than 750 ° C., the reaction with halogen becomes violent, and the light emitting metal is exchanged with a getter metal, for example, niobium. This tends to cause a decrease and a change in the emission color.

The means and shape for supporting the hydrogen and oxygen getters are not limited. However, when the hydrogen and oxygen getters are formed into a thin wire and wound around the halide-resistant portion, or when a ceramic sleeve is provided around the power supply conductor, by winding it around the outside of the sleeve, Support becomes easy.

The hydrogen and oxygen getters may be coated with a ceramic sealing compound after absorbing the hydrogen and oxygen in the discharge vessel. That is, after the sealing portion of the power supply conductor is sealed to the end portion of the discharge vessel by the sealing of the ceramic sealing compound, the discharge vessel is heated to a temperature at which hydrogen and oxygen are released.
Hydrogen and oxygen released by this heating are absorbed by the getter. Next, when the sealing portion of the ceramic sealing compound is heated again, the compound melts and extends over the hydrogen and oxygen getters to cover the getters.

As the hydrogen and oxygen getters, the same material as the sealing portion of the power supply conductor can be used.

Thus, in the present invention, the hydrogen and oxygen getters are provided in the vicinity of the base end of the halide-resistant portion separately from the sealing portion of the power supply conductor, so that the optimum operating temperature as the getter is obtained. Easy to maintain and exhibit good getter action. Moreover, since the getter acts on the sealing portion of the power supply conductor before performing the getter function, the sealing portion absorbs hydrogen and oxygen, loses ductility and malleability, and becomes brittle. In order to avoid such a problem, the buffering action is continuously performed on the ceramic sealing compound. For this reason, the discharge vessel can always maintain high airtightness.

Further, since the remaining hydrogen and oxygen in the discharge vessel are absorbed by the hydrogen and oxygen getters, the starting voltage does not increase and the discharge vessel does not blacken, and therefore, has a good life characteristic. A high pressure discharge lamp is provided.

A high pressure discharge lamp according to a second aspect of the present invention is the high pressure discharge lamp according to the first aspect, wherein at least an end portion of the sealing portion of the power supply conductor on the distal end side is surrounded by an end portion of the discharge vessel. A ceramic sleeve inserted into the
The ceramic sealing compound is characterized in that a portion on the tip end side of the sealing portion is covered between the ceramic sealing sleeve and the ceramic sealing compound.

When a ceramic sleeve is provided so as to surround the front end portion of the sealing portion and the front end portion is covered with a ceramic sealing compound seal, the sealing performance is improved. It has been found that cracks do not occur in the ceramic sealing compound seal and in the end portion of the discharge vessel starting from the boundary between the portion and the halide-resistant portion.

In addition, covering the front end portion of the sealing portion with the sealing of the ceramic sealing compound means that the base portion of the halide-resistant portion joined to the front end of the sealing portion. With the consequent consequence that the side parts are covered by the seal of the ceramic sealing compound. In such a case, in the related art, there is a problem that the base end side portion of the halide-resistant portion and the seal of the ceramic sealing compound are separated, but in the present invention, separation is less likely to occur. I understood.

The high-pressure discharge lamp according to the third aspect of the present invention is the high-pressure discharge lamp according to the first or second aspect, further comprising a ceramic sleeve inserted in an end portion; Supported by a sleeve;

The present invention is not limited to a specific means for supporting the hydrogen and oxygen getters on the ceramic sleeve.
For example, a groove is formed in the getter supporting portion on the outer surface of the ceramic sleeve, and a line of hydrogen and oxygen getters is wound around the groove to support the groove. But Getter said,
It may be formed into a plate shape.

Even if a hydrogen and oxygen getter is supported by the ceramic sleeve, the getter exhibits the intended function. Further, the above configuration facilitates the support of the hydrogen and oxygen getters.

The above-described operation of the ceramic sleeve does not change.

A high-pressure discharge lamp according to a fourth aspect of the present invention is characterized in that, in the high-pressure discharge lamp according to the first or second aspect, the hydrogen and oxygen getters are supported by a halide-resistant portion of the power supply conductor.

The support of the hydrogen and oxygen getters on the halide-resistant part can be realized, for example, by winding the getter in a linear form around the halide-resistant part. Further, the getter may be welded to the halide-resistant part, but it is not necessary to perform welding if the getter does not move only by winding.

The getter may have a plate shape or the like.

According to a fifth aspect of the present invention, there is provided the high-pressure discharge lamp according to the fourth aspect, wherein the end portion is closer to the discharge space than the position of the hydrogen and oxygen getters and has a halide-resistant portion. It is characterized in that it comprises a ceramic sleeve which is enclosed and inserted into the end part of the discharge vessel.

In the present invention, the ceramic sleeve is
A small gap is formed between the power supply conductor and the end portion of the discharge vessel and the ceramic sleeve, where the liquid halide enters and becomes the coldest part.

If necessary, in addition to the above, a second ceramic sleeve can be provided around the distal end of the sealing portion and the proximal end of the halide-resistant portion. This second ceramic sleeve prevents cracks at the end of the ceramic discharge vessel and the seal of the ceramic sealing compound starting from the boundary between the base end of the halide-resistant part and the sealing part. In addition, peeling between the halide-resistant material and the seal of the ceramic sealing compound is prevented.

A high pressure discharge lamp according to a sixth aspect of the present invention is the high pressure discharge lamp according to any one of the first to fifth aspects, wherein the transparent ceramic discharge vessel is made of a ceramic having a spinel structure. I have.

According to the present invention, the inventor has found that when a discharge vessel is constituted by a ceramic having a spinel structure, for example, spinel MgAl 2 O 4, the ceramic acts as a getter for hydrogen and oxygen. Therefore, the OH groups serving as nuclei when the halide in the discharge space reacts are not absorbed by the discharge vessel. For this reason, it is also possible to encapsulate a highly reactive luminescent metal, which has been impossible in the past. It has been found that the use of a ceramic having a spinel structure in the discharge vessel also improves the sealing property with respect to the halide-resistant part.

The formation of the spinel can be realized by mixing 200 to 800 ppm, preferably about 600 ppm, of magnesium oxide MgO with alumina.

According to a seventh aspect of the present invention, there is provided a lighting device comprising: a lighting device main body; and the high-pressure discharge lamp according to any one of the first to sixth aspects mounted on the lighting device main body. I have.

The present invention is applicable to all devices that use the above-described high-pressure discharge lamp of the present invention as a light source for any purpose, and these devices are collectively referred to as lighting devices. For example, various lighting fixtures, display devices, light projecting devices, and the like. Lighting equipment includes outdoor and indoor lighting equipment. The light projecting device can be applied to a liquid crystal projector, an overhead projector, a search light, a head lamp for a moving object, and the like.

[0056]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an enlarged sectional view of a main part showing a first embodiment of the high-pressure discharge lamp of the present invention.

In the figure, 101 is a discharge vessel, 102 is a ceramic sleeve, 103 is a power supply conductor, 104 is an electrode, 105 is a hydrogen and oxygen getter, 106 is a ceramic sealing compound seal, and 107 is a slight gap.

The discharge vessel 101 is made of translucent alumina ceramic, and has a bulging portion 101a and an end portion 101.
b, 101b.

The bulging portion 101a has an inner diameter of 13 mm and a total length of 3 mm.
It is 5 mm thick and about 1 mm thick and consists of a cylindrical part and a pair of conical parts located at both ends.

The end portion 101b has a cylindrical shape with an inner diameter of 2.2 mm, a length of 15 mm, and a thickness of about 1 mm.

The ceramic sleeve 102 is made of alumina and has a cylindrical shape having an outer diameter of 2 mm, an inner diameter of 1 mm, and a length of 15 mm. Then, at a position 5 mm from the outer end of the ceramic sleeve 102, a width of about 1 mm
A groove 102a having a depth of 0.3 mm is formed.

The power supply conductor 103 includes a sealing portion 103a.
And a halide-resistant part 103b.

The sealing portion 103a has an outer diameter of 0.9 m.
m, consisting of a niobium rod 4 mm long.

The halide-resistant portion 103b has an outer diameter of 0.1 mm.
7 mm tungsten rod, sealing part 10
The tip of 3a is welded by laser.

The electrode 104 is formed by winding a tungsten wire having an outer diameter of 0.5 mm twice around the tip of the halide-resistant part 103b.

The hydrogen and oxygen getter 105 has an outer diameter of 0.1 mm.
5 mm niobium wire, ceramic sleeve 102
Is wound around and supported by a groove 102a formed around it.

[0068] Seal 1 of the compound for ceramic sealing
06 is Al_TwoO_Three-SiO_Two-Dy_Two O_ThreeSystem glass free
Is melted and solidified to form an end portion 1 of the discharge vessel 101.
01b, ceramic sleeve 102 and power supply conductor 10
The third sealing portion 103a is hermetically sealed.

Thus, a slight gap 107 is formed between the halide-resistant portion 103b and the inner surface of the ceramic sleeve 102, and between the outer surface of the ceramic sleeve 102 and the inner surface of the end portion 101b of the discharge vessel 101. I have.

A starting gas, a luminescent metal halide, and buffering mercury are sealed as a discharge medium inside the discharge vessel 101.

The starting gas is 50 torr of argon.

The luminescent metal halide is 30 mg of a mixture of dysprosium iodide, thallium iodide and sodium iodide.

The obtained high-pressure discharge lamp was 100 V AC.
Operates at 250 W lamp power at the power supply.

The lighting test of the high-pressure discharge lamp of this embodiment and the high-pressure discharge lamp of the comparative example having the same specifications as above except that the getter was not provided showed that the luminous efficiency for 100 hours was 90 lm / W and the correlated colors were 100 hours. Although the temperature was 4000K, after 6000 hours had elapsed, the present embodiment provided a value of 8 for 100 hours.
5%. In contrast, the comparative example was also 75%.

In this embodiment, the lamp voltage is +15.
V or less, but +25 V in the comparative example.

Next, a method for manufacturing the high-pressure discharge lamp will be described.

The sealing portion 103a and the tip of the electrode 10
The power supply conductor 103 is manufactured by welding the anti-halide part 103b to which the ceramic sleeve 1 is attached.
02 to form a sealing structure M.

Next, the sealing structure M is inserted into one end portion 101b of the translucent ceramic discharge vessel 101, and a ceramic sealing compound formed in a ring shape in advance is used as the end portion 101b of the discharge vessel 101. The ceramic sealing compound is melted by being placed on the end face and heated in a vacuum or rare gas atmosphere, and is extended to a predetermined position to form the seal 106.

Thereafter, in the dry box, the halide pellets and mercury are discharged from the other end portion to the discharge vessel 1.
After that, the sealing structure M is inserted into the other end portion, the ring-shaped ceramic sealing compound is placed on the end surface of the end portion, and heated in an argon atmosphere. To form a high-pressure discharge lamp.

In the above steps, the sealing portion of the power supply conductor 102 is completely replaced with the ceramic sealing compound seal 10.
6 surrounded.

Next, in a vacuum atmosphere at 650 ° C.
The high pressure discharge lamp is heated for about 2 hours. In this step, the halide pellets in the discharge vessel are melted,
The water contained inside is discharged into the discharge vessel.
Then, the released moisture is a hydrogen and oxygen getter 105.
, The inside of the discharge vessel 101 is cleaned up.

The higher the heating temperature, the sooner the impurity gas is absorbed, but if the heating temperature exceeds 750 ° C., the seal of the ceramic sealing compound may be damaged. 700 ° C. is desirable.

Further, the cleanup in the discharge vessel
It is also performed by heat from the subsequent discharge.

FIG. 2 is an enlarged sectional view of a main part of a high-pressure discharge lamp according to a second embodiment of the present invention.

In the following, the same parts as those in FIG.

This embodiment is different from the first embodiment in that the power supply conductor 103 and the ceramic sleeve 102 can be easily fixed.

That is, in order to position the sealing portion 103 a with respect to the ceramic sleeve 102, the caulked portion k is formed at a position in contact with the ceramic sleeve 102.

On the other hand, the end portion 101b of the discharge vessel 101
A peripheral step s is formed on the inner surface of the outer end of the ceramic sleeve 102, and a circumferential protrusion p is formed on the outer surface of the outer end of the ceramic sleeve 102.

Then, the power supply conductor 103 is inserted into the ceramic sleeve 102, and the caulked portion k is brought into contact with the end face of the ceramic sleeve 102. In addition, the ceramic sleeve 102 is inserted into the end portion 101b so that the circumferential protrusion p
Is brought into contact with the peripheral step s of the end portion 101b. In this state, the ceramic sealing compound seal 106 is formed to make the discharge vessel 101 airtight. With this configuration, the power supply conductor 103 and the ceramic sleeve 102 can be fixed at predetermined positions by gravity. In addition,
By the locking of the peripheral step portion s and the peripheral convex portion p, the flow-down position of the seal of the ceramic sealing compound can be regulated.

FIG. 3 is an enlarged sectional view showing a main part of a third embodiment of the high-pressure discharge lamp according to the present invention.

In the figure, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

This embodiment is different in that the ceramic sleeve is divided into two parts.

That is, the first ceramic sleeve 10
2 _A contributes to the seal 106 of the compound for the ceramic sealing, the second ceramic sleeve 102 _B contributes to forming a small gap 107 around the halide-resistant portion 103b.

Both ceramic sleeves 102 _A and 10
It is disposed by winding two halogen-resistant portion 101b hydrogen and oxygen getter 105 by utilizing between _B.

[0095] is used stopper 108 for positioning the second ceramic sleeve 102 _B.

FIG. 4 is an enlarged sectional view of a main part of a high-pressure discharge lamp according to a fourth embodiment of the present invention.

In the figure, the same parts as those in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted.

The present embodiment is different in that the sealing portion is composed of a niobium cap 103a '.

That is, the ceramic sealing compound seal 106 is formed between the end portion 101b and the niobium cap 103a ', so that the discharge vessel 101 is airtight.

The hydrogen and oxygen getter 105 is wound around the base end of the halide-resistant part 103b.
The intermediate portion of the halogen-resistant portion 103b is inserted into the ceramic sleeve 102 _C, hydrogen and oxygen getter 105
And the stopper 108. The ceramic sleeve 102 _C forms a slight gap 107.

FIG. 5 is a front view showing a high-pressure discharge lamp according to a fifth embodiment of the present invention.

In the figure, 109 is an arc tube, 110 is a support conductor, 111 is a support band, 112 is an insulating tube,
113 is a conductor frame, 114 is a flare stem, 115 is an outer tube, 116 is a base, and 117 is a conductor.

The arc tube 109 is a high-pressure discharge lamp having the same structure as the embodiment shown in FIG.

The supporting conductor 110 is welded to the upper sealing portion 103a in the figure of the arc tube 109, and
09 and current is introduced.

The support band 111 includes an insulating tube 112
The lower portion 103a of the arc tube 109 in FIG.

The conductor frame 113 is disposed outside the arc tube 109 with a space therebetween, and supports both ends of the support conductor 110 and the support 111 by welding.
a, 113a.

The flare stem 114 has a pair of internal lead wires 114a and 114b, and the lower end of the conductor frame 113 is welded to one of the internal lead wires 114a to support the arc tube 109 at a predetermined position. . The other internal lead wire 114b is connected to a lower sealing portion of the arc tube 109 in the drawing via a conductive wire 116.

The outer tube 115 is formed of a cylindrical T-shaped valve, and a flare stem 114 is sealed to a lower neck portion in the figure, and the above-described members are hermetically housed therein. The contact piece 113a of the conductor frame 113 is
The elastic frame 5 elastically contacts the inner surface near the distal end of the conductor tube 5, protects the conductor frame 113 against an externally applied impact, and holds the conductor frame 113 at a predetermined position with respect to the outer tube 115. In addition, the outer tube 11
The interior of 5 is evacuated to a vacuum state or filled with an inert gas after evacuation.

The base 116 is fixed to the neck of the outer tube 115 and is electrically connected to a pair of internal lead wires of the flare stem 114.

Although not shown, the outer tube 115 contains
The initial getter and the performance getter are provided as required.

Thus, the high pressure discharge lamp according to the fifth embodiment of the present invention described above can be used for general lighting.

FIG. 6 is a cross-sectional view showing a ceiling-recessed downlight in one embodiment of the lighting device of the present invention.

In the figure, 118 is a high-pressure discharge lamp, 1
19 is a downlight body.

The high-pressure discharge lamp 118 has the same structure as that shown in FIG.

The main body 119 of the downlight is
a, a socket 119b, a reflector 119c, and the like.

The base 119a has a ceiling contact edge e at the lower end to be embedded in the ceiling.

The socket 119b is mounted on the base 119a.

The reflector 119c is supported by the base 119a and surrounds the light emitting center of the high-pressure discharge lamp 118 such that the center of light emission is located substantially at the center.

[0119]

According to the first to sixth aspects of the present invention, the hydrogen and oxygen getters are disposed near the base end of the halide-resistant portion of the power supply conductor, so that the hydrogen and oxygen getters can be operated at optimum operating temperatures. Therefore, the same material as the hydrogen and oxygen getters has been used in the sealing portion of the power supply conductor sealed in the translucent ceramic discharge vessel because the getter function is easily maintained. Also, since the portion does not act as a getter, the sealing portion absorbs hydrogen and / or oxygen, loses ductility and malleability, does not become brittle, and has a cushioning effect on the ceramic sealing compound. Can be provided continuously.

According to the second aspect of the present invention, in addition, the front end portion of the sealing portion is surrounded by the ceramic sleeve, so that the front end portion of the sealing portion and the base end of the halide-resistant portion. Cracking of the ceramic sealing compound and the end of the discharge vessel starting from the boundary with the part is unlikely to occur, and separation between the base part of the halide-resistant part and the ceramic sealing compound occurs. A difficult high-pressure discharge lamp can be provided.

According to the third aspect of the present invention, since the hydrogen and oxygen getters are additionally supported by the ceramic sleeve at the end portion, a high-pressure discharge lamp that can easily support the hydrogen and oxygen getters can be provided. .

According to the fourth aspect of the present invention, in addition, by supporting the hydrogen and oxygen getters on the anti-halide portion, it is possible to provide a high-pressure discharge lamp suitable without using a ceramic sleeve.

According to the fifth aspect of the present invention, in addition, the ceramic sleeve is provided around the halide-resistant portion on the discharge space side from the positions of the hydrogen and oxygen getters.
It is possible to provide a high-pressure discharge lamp in which a small gap is easily formed around the halide-resistant portion.

According to the sixth aspect of the present invention, there is further provided a high-pressure discharge lamp which functions as a getter since the ceramic discharge vessel is formed of ceramic having a spinel structure, since the ceramic absorbs hydrogen and oxygen. be able to.

According to the invention of claim 7, it is possible to provide a lighting device having the effects of claims 1 to 6.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part showing a first embodiment of a high-pressure discharge lamp of the present invention.

FIG. 2 is an enlarged sectional view of a main part showing a second embodiment of the high-pressure discharge lamp of the present invention.

FIG. 3 is an enlarged sectional view of a main part showing a third embodiment of the high-pressure discharge lamp of the present invention.

FIG. 4 is an enlarged sectional view of a main part of a high-pressure discharge lamp according to a fourth embodiment of the present invention.

FIG. 5 is a front view showing a high-pressure discharge lamp according to a fourth embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a ceiling-recessed downlight in one embodiment of the lighting device of the present invention.

FIG. 7 is an enlarged sectional view showing a conventional high-pressure discharge lamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 ... Discharge container 101a ... Swelling part 101b ... End part 102 ... Ceramic sleeve 102a ... Groove 103 ... Power supply conductor 103a ... Sealing part 103b ... Halogen-resistant part 104 ... Electrode 105 ... Hydrogen and oxygen getter 106 ... Ceramic Sealing compound seal 107 ... slight gap

Continued on the front page (72) Inventor Seiji Ashida 4-3-1 Higashi-Shinagawa, Shinagawa-ku, Tokyo Toshiba LITEC Corporation (72) Inventor Tatsuo Otabe 4-3-1 Higashi-Shinagawa, Shinagawa-ku, Tokyo Itec Inc.

Claims (7)

[Claims] 1. A translucent ceramic discharge vessel having a bulging portion surrounding a discharge space and an end portion which is disposed in communication with both ends of the bulging portion and has an inner diameter smaller than the bulging portion; A halogen-resistant part having a base end connected to the tip of the part and the sealing part, penetrating through the end part of the light-transmitting ceramic discharge vessel, and having a small distance between the end part and the end part. A power supply conductor forming a gap; an electrode disposed in the bulge portion and connected to the power supply conductor; a ceramic sealing compound seal for sealing the end portion and the power supply conductor; and at least one end portion A high-pressure discharge lamp, comprising: a hydrogen and oxygen getter disposed in the vicinity of the base end of the halide-resistant part; and a discharge medium containing a metal halide and enclosed in a discharge space. . 2. A ceramic sleeve inserted into an end portion of a discharge vessel surrounding at least a tip portion of a sealing portion of a power supply conductor; 2. The high-pressure discharge lamp according to claim 1, wherein a portion on the tip end side of the sex part is covered between the ceramic sleeve. 3. The high-pressure discharge lamp according to claim 1, further comprising a ceramic sleeve inserted into an end portion of the discharge vessel; and wherein the hydrogen and oxygen getters are supported on the ceramic sleeve. . 4. The high-pressure discharge lamp according to claim 1, wherein the hydrogen and oxygen getters are supported by a halide-resistant portion of the power supply conductor. 5. A ceramic sleeve which is inserted into an end portion of a discharge vessel on a side of a discharge space portion from a position of a hydrogen and oxygen getter and surrounding a halide-resistant portion. The high-pressure discharge lamp according to claim 4, wherein 6. The high-pressure discharge lamp according to claim 1, wherein the transparent ceramic discharge vessel is made of a ceramic having a spinel structure. 7. A lighting device comprising: a lighting device main body; and the high-pressure discharge lamp according to claim 1 mounted on the lighting device main body.