JPH1196973A - High pressure discharge lamp and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high pressure discharge lamp with required life time characteristics by preventing peeling from being produced between a base end part of a halide resistant part and seal of ceramic sealing compound as well as preventing cracks from being produced near a boundary part between a sealing part of a feeder conductor and a halide resistant part. SOLUTION: A feeder conductor 103 penetrating in an end part of a discharge container 101 of light transmitting ceramic contains a sealing part 103a and a halide resistant part 103b connected to its tip, a ceramic sleeve 102 surrounding neighborhood of a boundary of the sealing part 103a and the halide resistant part 103b is provided, and the feeder conductor 103, the ceramic sleeve 102 and the end part 101b are sealed by seal 105 of ceramic sealing compound. Since the ceramic sleeve 102 lies between the boundary part and the end part, the seal 105 of ceramic sealing compound in that part can be made thin and its cushioning properties are enhanced, and therefore, cracks and peeling can be reduced.

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.

However, one of the difficulties in using a ceramic discharge vessel in practical use is a seal.

FIG. 8 is a sectional view showing a first conventional high-pressure discharge lamp.

The conventional high pressure discharge lamp is disclosed in
It is described in JP-A-66556 and has the following configuration.

That is, the discharge vessel 1 has a total length of 19 mm,
It has a cylindrical wall 2 made of densely sintered polycrystalline aluminum oxide having an outer diameter of 8.45 mm and an inner diameter of 6.85 mm. End walls 3, 4, 5, 6 of similarly sintered aluminum oxide are hermetically sintered to the respective ends of the cylindrical wall 2. These terminal walls 3, 4, 5 and 6 consist of disks 3 and 5 having a thickness of 2 mm and protruding tubes 4 and 6, respectively. The protruding portions of these protruding tubes 4 and 6 are 8 mm long and 3 m long.
m and an inner diameter of 2.05 mm.

The tungsten pins 7 and 8 having a diameter of 0.2 mm are formed with the aid of a molten glass resistant halide represented by the reference numerals 9 and 10, respectively.
Enclosed in protruding tubes 4, 6, respectively, together with aluminum oxide filling pieces or packing pieces 17 and 18, respectively. The ends of the tungsten pins 7, 8 located inside the discharge vessel 1, together with the tips 13 and 14 facing each other, respectively
Nos. 1 and 12 are provided, and tungsten electrode filaments 15 and 16 (two layers each of a 0.3 mm diameter tungsten wire, five rotations) are provided.

FIG. 9 is a sectional view showing a second conventional high-pressure discharge lamp.

This conventional high-pressure discharge lamp is disclosed in
This is described in FIG. 8 of 196131 and the related specification.

That is, there is provided a ceramic discharge vessel 710 made of DGA material, which surrounds a discharge space 711,
It contains an ionizable filling containing a metal halide. The packing in this case consists of mercury and a metal halide. The fill contains argon and a starting gas.

First and second electrodes 740a are disposed in the discharge vessel 710.

A winding 76 in which the body halide portion 751a is made of a molybdenum wire on a molybdenum rod.
0a was formed by winding. In implementing this example,
The diameter of the rod is 406 μm, and the winding 760a is 12 mm in diameter.
Made with 9 μm, 139 μm and 145 μm wires. The inner diameter D of the end section 730a was 760 μm. The voids between the inner surface of the end section 730a and the outer surface of the winding of each thickness are 48 μm, 38 μm and 32 μm, respectively.
m. Winding 76 made of 139 μm diameter wire
It was confirmed that Oa exhibited extremely good results. The length of the anti-halide portion 751a was 8.5 mm, and extended the inside of the end section 730 by the same distance L1.

Therefore, the distance L1 is equal to the end section 730a.
Is larger than the value obtained by adding 2 mm to the inner diameter (2.76 mm).

The halide-resistant portion 751a is covered with a fused ceramic seal 732a over a length L3 of 1 mm.

The permeable portion 752a was a solid niobium rod. The rod extended inside the end section 730a over a distance L2 of 2 mm.

The power consumption of this lamp was 70 W,
Is described.

[0017]

However, the first and second conventional high-pressure discharge lamps described above both have a problem in sealing the discharge vessel, as will be described below.

That is, in the case of the first conventional high-pressure discharge lamp, the power supply conductor is a single tungsten pin 7, 8, and the tungsten pins 7, 8 and the projecting tubes 4, 6 of the discharge vessel 1, that is, the end portions. Packing piece 1 between
The ceramic sleeves 7 and 18 are inserted, and the molten glass 9 and 10, ie, the ceramic sealing compound, are hermetically sealed.

However, since the difference in the coefficient of thermal expansion between the ceramic sealing compound and tungsten cannot be ignored, it is difficult to obtain a required seal even with the presence of the ceramic sleeve.

Next, in the case of the second conventional high-pressure discharge lamp, the portion of the power supply conductor which contacts the seal 732a of the ceramic sealing compound is made of a sealing portion such as niobium to thereby provide the first conventional high pressure discharge lamp. To solve the problem of the seal in the high-pressure discharge lamp.

However, the metal constituting the sealing portion is
Since there is a problem of corrosion in response to halogen, so that the sealing part does not contact the halogen in the discharge space,
It must be completely covered by the ceramic sealing compound seal. For this reason, in the second conventional high-pressure discharge lamp, the seal 732a of the compound for ceramic sealing extends to the halide-resistant portion 751a over a distance L3 (1 mm).

However, when the seal of the ceramic sealing compound comes into contact with the halide-resistant part, the following problems arise due to the difference in the coefficient of thermal expansion between the two, due to the sealing step during manufacturing or the repetitive blinking of the high-pressure discharge lamp. Occurs.

That is, since tungsten and molybdenum constituting the halide-resistant portion have a smaller coefficient of thermal expansion than the halogen-resistant portion such as niobium, the tungsten or molybdenum has a higher thermal expansion coefficient during sealing or with repeated blinking of the high-pressure discharge lamp. The first part between the halide part and the seal of the ceramic sealing compound peels off.

In addition, cracks are likely to occur in the ceramic sealing compound and the second portion toward the end portion of the discharge vessel starting from the boundary between the permeable portion and the halide-resistant portion.

When peeling occurs in the first portion, the permeable portion comes into contact with the halide, so that the permeable portion is deteriorated by corrosion.

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

According to the present invention, cracks are not generated near the boundary between the sealing portion of the power supply conductor and the halide-resistant portion, and the base end of the halide-resistant portion and the ceramic sealing compound are prevented from cracking. It is an object of the present invention to provide a high-pressure discharge lamp capable of obtaining required life characteristics by preventing peeling from occurring with a seal, and a lighting device using the same.

[0028]

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 having a sealing portion whose base end protrudes outward from the end portion to form a small gap between the power supply conductor and the discharge vessel; A ceramic sleeve surrounding at least the boundary between the sealing portion and the halide-resistant portion between the end portions; an electrode disposed in the bulge portion and connected to the power supply conductor; an end portion of the discharge vessel , Ceramic sleeve and feed conductor It is characterized in that it comprises a; and sealing the ceramic sealing compound for sealing a; a discharge medium sealed in the discharge space portion comprises a metal halide.

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 translucency may be any value as long as light emitted by discharge can be transmitted to the outside through the discharge vessel, and may be transparent or diffusely transmissive.

Further, the bulging portion and the end portion of the discharge vessel may be integrally formed. However, the swelling part is integrated by sintering a pair of tubes inserted into the center hole of the end plate, and an end plate having a pair of center holes closing both ends of the cylindrical body and the cylindrical body. May be done.

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 portion and a halide-resistant portion following the sealing portion. It is fixed to the portion via a ceramic sealing compound seal.

The term "sealing portion" refers to a portion of a material suitable for sealing the discharge vessel between its end portion and the sealing portion by sealing the ceramic sealing compound. For example, titanium, zirconium, hafnium, vanadium, niobium and tantalum, or alloys thereof can be used.

The sealing portion may have any permeability to hydrogen and oxygen, but the above-mentioned materials are the same as the permeable materials 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 tantalum have almost the same average coefficient of thermal expansion as DGA.
It is preferred to use niobium and / or tantalum as the sealing part. 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 "halide-resistant portion" is a portion made of a material which has little or no corrosive action due to halide and free halogen present in the discharge space vessel during operation of the high-pressure discharge lamp. Means, for example, a metal selected from the group consisting of tungsten, molybdenum, platinum, iridium, rhenium and rhodium, or a portion comprising at least one silicide, carbide or nitride of these metals. Alternatively, a core material of a different material may be coated with the above material.

The “small gap” means that a space formed between the power supply conductor and the inner surface of the end portion is at least 5 μm.
m means a void having a size of at most 1/4 of the inner diameter of the end portion and not more than about 200 μm.

Therefore, the diameter of the halide-resistant portion of the power supply conductor penetrating the end portion is at least の of the inner diameter of the end portion.

Further, 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, when the halide-resistant portion of the power supply conductor is composed of a rod made of a halide-resistant material and a coil made of a halide-resistant material wound around the rod, a slight gap is required. This can be formed between the end portion of the discharge vessel and the outer surface of the coil, that is, the outer peripheral surface of the halide-resistant material.

Further, a small gap is formed during operation of the high-pressure discharge lamp by surplus halide entering in a liquid state to form a coolest portion. The desired coldest part temperature can be achieved. By making the slight gap as small as possible, the amount of the discharge medium to be sealed can be reduced.

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

The ceramic sleeve only needs to surround at least the vicinity of the boundary between the sealing portion of the power supply conductor and the halide-resistant portion, but if necessary, it covers substantially the entire length of the end portion of the discharge vessel. May be extended.

In the case of adopting the latter structure, a small gap can be formed between the ceramic sleeve and the anti-halide of the power supply conductor and between the end portion of the discharge vessel and the ceramic sleeve.

In the present invention, the ceramic sleeve is disposed so as to surround the vicinity of the boundary between the sealing portion of the power supply conductor and the anti-halide portion, thereby sealing the ceramic sealing compound starting from the boundary. The most important effect is that cracks at the end portions of the discharge vessel and peeling between the halide-resistant portion and the seal can be prevented. This effect is essentially the same whether or not the ceramic sleeve extends over the entire length of the end portion.

However, the present invention may be a short one in which the ceramic sleeve exists only near the boundary. Such a small-sized ceramic sleeve is advantageous in cost. In this case, a slight gap can be easily realized by using a body halide portion composed of a rod and a wire wound around the rod as described above, for example.

If the ceramic sleeve is arranged near the boundary between the sealing portion of the power supply conductor and the halide-resistant portion, the reason why a good seal can be obtained as described above is not clear. It is possible that the sealing of the compound for ceramic sealing can be made considerably thinner due to the presence of, and with this, the sealing effect is not changed and the cushioning property is increased, so that the seal may easily adapt to the difference in the coefficient of thermal expansion. Conceivable.

According to a second aspect of the present invention, there is provided the high-pressure discharge lamp according to the first aspect, wherein the halide-resistant portion of the power supply conductor has a base end portion which is at least a halide-resistant and sealable portion. And a coil made of a halide-resistant wire wound around an intermediate portion adjacent to the ceramic sleeve around the rod facing the end portion of the discharge vessel. A slight gap is formed between the coil of the end portion of the discharge vessel and the halide-resistant portion;

In the present invention, since the halide-resistant part is configured as described above, the ceramic sleeve is a short sleeve that surrounds only the vicinity of the boundary between the sealing part of the power supply conductor and the halide-resistant part. What is necessary is just to use a thing, and cost can be reduced. A slight gap can be formed between the outer peripheral surface of the coil in the halide resistant portion and the inner surface of the end portion of the discharge vessel.

Further, if necessary, a second ceramic sleeve for forming a small gap can be arranged around the halide-resistant portion.

According to a third aspect of the present invention, there is provided the high-pressure discharge lamp according to the first or second aspect, wherein the ceramic sleeve does not surround a portion other than a base end of the halide-resistant portion of the power supply conductor. It is characterized by.

In the present invention, in order to form a small gap around the halide-resistant portion, the structure of claim 2 can be adopted. As a configuration different from this, for example, the diameter of a rod constituting the anti-halide portion may be increased.

As described above, in the present invention, a short ceramic sleeve is used, but there is a degree of freedom in design.

A high-pressure discharge lamp according to a fourth aspect of the present invention is the high-pressure discharge lamp according to any one of the first to third aspects, characterized in that the high-pressure discharge lamp is provided with a stopper close to the tip of the ceramic sleeve.

The stopper positions the ceramic sleeve so that the ceramic sleeve does not shift during sealing in the manufacturing stage.

As the stopper, a heat-resistant metal such as tungsten or molybdenum is suitable, and it may be formed into a wire and wound around the halide-resistant portion.

According to a fifth 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 fourth 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.

[0061]

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 translucent ceramic discharge vessel, 102 is a ceramic sleeve, 103 is a power supply conductor, 104 is an electrode, 105 is a ceramic sealing compound seal, and 106 is a slight gap.

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

The bulging portion 101a is closed by an end plate having a center hole formed at both ends of a cylinder having an inner diameter of 9.7 mm and a total length of 47 mm.

The end portion has an outer diameter of 2.6 mm and an inner diameter of 1.0.
A translucent alumina ceramic tube of 1 mm is inserted into the center hole of the end plate, and the bulging portion 101a and the end portion 101b are sintered to form an integrated discharge vessel 101.

The ceramic sleeve 102 is made of alumina and has an outer diameter of 0.97 mm, an inner diameter of 0.52 mm, and a length of 4 mm.
It has a cylindrical shape of about 6 mm.

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

The sealing portion 103a has a diameter of 0.5 mm
Consisting of niobium sticks.

The halide-resistant portion 103b has a diameter of 0.3 mm.
It consists of a 5 mm tungsten rod A and a coil B, and the base end of the rod A is welded to the tip of the sealing portion 103a by laser. Coil B is 0.2m in diameter
m of molybdenum wire is wound around the rod A.

The electrode 104 is formed by winding a tungsten wire having an outer diameter of 0.1 mm around the tip of the rod A twice.

Seal 1 of compound for ceramic sealing
05 is obtained by melting and solidifying an Al ₂ O ₃ —SiO ₂ —Dy ₂ O ₃ system, and forming an end portion 101 of the discharge vessel 101.
b, sealing portion 103a and halide-resistant portion 103 of ceramic sleeve 102 and power supply conductor 103
The base end of b is hermetically sealed.

Thus, a slight gap 106 is formed between the coil B of the halide resistant portion 103b and the inner surface of the end portion of the discharge vessel.

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

The starting gas is about 80 torr of argon.

The luminescent metal halide is 8.8 mg of a mixture of dysprosium iodide, thallium iodide and sodium iodide.

The amount of mercury is about 18 mg.

The obtained high-pressure discharge lamp is 100 V AC.
Operates at 150 W of lamp power in the power supply.

A comparative high-pressure discharge lamp having the same specifications except that the high-pressure discharge lamp of the present embodiment and the ceramic sleeve were not provided was manufactured, and the results of a comparison test of blinking of both were as follows. .

The high-pressure discharge lamp for comparison was cracked 50 times after flashing and became a point.

In the present embodiment, even if the light was turned on and off 100 times, it was normal.

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.

The present embodiment is different in that the configuration of the translucent ceramic discharge vessel 101 ′, the thickness of the sealing portion of the power supply conductor 103 and the material of the anti-halide are changed.

That is, the discharge vessel 101 ′ is
01a 'and the end portion 101b' are integrally formed.

For the sealing portion 103a ', a niobium rod having a diameter of 0.89 mm was used, and the tip portion was made to have a length of 2 mm.
The diameter is 0.5 mm over に わ た り 3 mm.

The halide-resistant portion 103b 'is formed by winding a molybdenum coil B around a molybdenum rod A' having a diameter of 0.5 mm.

Further, an electrode shaft 104a made of tungsten having a diameter of 0.5 mm is laser-welded to the tip of the rod A 'of molybdenum.

In this embodiment, since the sealing portion is thickened, the heat capacity of the portion is increased, and the flow of the ceramic sealing compound is improved. to be certain.

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.

In this embodiment, the anti-halide portion 103
b in that it comprises a tungsten rod A "having a diameter of 0.4 mm and a coil B" of tungsten having a diameter of 0.25 mm.

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.

In this embodiment, the anti-halide portion 103
b consists only of a molybdenum rod having a diameter of 0.5 mm,
The difference is that the stopper 107 of the ceramic sleeve 102 is mounted on the halide-resistant part 103b.

That is, the stopper 107 has a diameter of 0.2
mm of molybdenum wire is wound once.

Also, as in FIG.
The electrode shaft 104a made of tungsten is laser-welded to the tip of 03b.

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

In the figure, 108 is a performance getter, 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,
14 is a flare stem, 115 is an outer tube, 116 is a base, 1
17 is a conducting wire, and 118 is a protective tube.

The performance getter 108 is made of a zirconium-aluminum alloy and adsorbs impurities gradually released into the outer tube 115 during the life of the high-pressure discharge lamp to maintain the inside of the outer tube 115 at a vacuum. Although not shown, an initial getter made of barium is provided without the outer tube 115, and after sealing the outer tube 115, a high frequency is applied to evaporate and adsorb the initial impurities.

The arc tube 109 is a high-pressure discharge lamp having the same structure as that of 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 arranged outside the arc tube 109 with a space therebetween, supports both ends of the support conductor 110 and the support band 111 by welding, and has elastic contact pieces 113a, 113a at the upper end. ing.

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 the conductor 11
7 is connected to the lower sealing portion of the arc tube 109 in the figure.

The outer tube 115 is formed of a cylindrical T-shaped valve having an outer diameter.
4 are sealed, and the above-described members are hermetically housed therein.

The contact piece 113a of the conductor frame 113 is
Elastic contact with the inner surface near the tip of the outer tube 115 to protect the conductor frame 113 against externally applied impact,
And it is held at a predetermined position with respect to the outer tube 115. Also,
The inside of the outer tube 115 is evacuated and evacuated.

The base 116 is E-shaped, and the outer tube 115
And the flare stem 114
Are electrically connected to a pair of internal lead wires.

The protective tube 118 is a cylindrical body made of quartz glass, has an outer diameter of 21 mm and an inner diameter of 18 mm, and surrounds the arc tube 109 and is fixed between the support band 111 and the support conductor 110.

The high-pressure discharge lamp according to the fifth embodiment of the present invention described above is suitable for general lighting which consumes relatively large power.

FIG. 6 is a front view showing a sixth embodiment of the high-pressure discharge lamp of the present invention.

In the figure, the same parts as those in FIG. 5 are denoted by the same reference numerals with dashes (').

The arc tube 109 'has the same structure as the high-pressure discharge lamp shown in FIG.

The outer tube 115 'has an outer diameter of 21 mm and an inner diameter of 18 mm.
mm, a pinch seal portion 115a 'is formed in the lower part in the figure, and a luminous tube 109' is internally provided with connection conductors 119a, 119b and 119c made of molybdenum.
Are supported and electrically connected to each other.

The connecting conductors 119a and 119c
Are connected to sealing metal foils 120, 120.

The socket 116 'is G-shaped, and the outer tube 1
It is bonded to the pinch seal portion 115a 'of 15' by means of die cap cement. The sealing metal foil 120 and the base pin 116a 'are connected by a connection line (not shown).

In this embodiment, the power consumption is 150
It is suitable for a relatively small one of W or less.

FIG. 7 is a sectional view showing a ceiling-mounted downlight in an embodiment of the lighting apparatus of the present invention.

In the figure, 121 is a high-pressure discharge lamp, 1
22 is a main body of the downlight.

The high-pressure discharge lamp 122 has the same structure as that shown in FIG.

The main body 122 of the downlight is
a, a socket 122b, a reflection plate 122c, and the like.

The base 122a has a ceiling contact edge e at the lower end to be embedded in the ceiling.

The socket 122b is mounted on the base 122a.

The reflection plate 122c is supported by the base 122a and surrounds such that the emission center of the high-pressure discharge lamp 121 is located substantially at the center.

[0126]

According to the first to fourth aspects of the present invention, a ceramic sleeve is provided so as to surround at least the vicinity of the boundary between the sealing portion of the power supply conductor and the halide-resistant portion. The seal of the power supply conductor, the ceramic sleeve and the end portion of the translucent ceramic discharge vessel is sealed with the seal of the above, so that cracks directed toward the seal and the end portion of the ceramic sealing compound from the above boundary portion are less likely to occur. Become
A high-pressure discharge lamp having a required life characteristic can be provided by making it difficult for peeling to occur between the base end portion of the halide-resistant portion and the seal of the ceramic sealing compound.

According to the second aspect of the present invention, in addition to the above, a halide-resistant portion is formed including the rod and the coil wound around the rod, and a small gap is formed between the coil and the inner surface of the end portion. By forming the ceramic sleeve between the short, it is only necessary to use a short sleeve that surrounds only the vicinity of the boundary between the sealing portion of the power supply conductor and the halide-resistant portion.
A cost-effective high-pressure discharge lamp can be provided.

According to the third aspect of the present invention, in addition to the fact that the ceramic sleeve does not surround the portion other than the vicinity of the boundary between the sealing portion and the halide-resistant portion, it is advantageous in terms of cost and design. It is possible to provide a high-pressure discharge lamp having a high degree of freedom.

According to the fourth aspect of the present invention, in addition, by providing the stopper close to the tip of the ceramic sleeve, it is possible to provide a high-pressure discharge lamp in which the displacement of the ceramic sleeve hardly occurs at the time of sealing.

According to the invention of claim 5, it is possible to provide a lighting device having the effects of claims 1 to 4.

[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 fifth embodiment of the high-pressure discharge lamp of the present invention.

FIG. 6 is a front view showing a high-pressure discharge lamp according to a sixth embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a ceiling-recessed downlight in an embodiment of the lighting device of the present invention.

FIG. 8 is a sectional view showing a first conventional high-pressure discharge lamp.

FIG. 9 is a sectional view showing a second conventional high-pressure discharge lamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 ... Translucent ceramic discharge container 101a ... Swelling part 101b ... End part 102 ... Ceramic sleeve 103 ... Power supply conductor 103a ... Sealing part 103b ... Halogen-resistant part 104 ... Electrode 105 ... Ceramic sealing compound Seal 106: slight gap A: rod B: coil

Continued on the front page (72) Atsushi Saita, Inventor, 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 (5)

[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 halide-resistant part whose base end is connected to the tip of the part and the sealing part, penetrates through the single-part part of the light-transmitting ceramic discharge vessel, and has a slight distance between the end part. A power supply conductor forming a gap; a ceramic sleeve surrounding at least the vicinity of a boundary between the power supply conductor and the end portion of the discharge vessel at the sealing portion and the halide-resistant portion; and disposed in the bulging portion. An electrode connected to the power supply conductor; an end portion of the discharge vessel, a ceramic sleeve and a seal of a ceramic sealing compound for sealing the power supply conductor; and a discharge medium containing a metal halide and sealed in the discharge space. High-pressure discharge lamp, characterized in that it comprises a. 2. A halide-resistant part of the power supply conductor is opposed to a rod having at least a surface resistant to halide and having a base end connected to a sealing part and an end part of the discharge vessel. A coil of a halide-resistant wire wound around the rod and at an intermediate portion adjacent to the ceramic sleeve; a small gap between the end portion of the discharge vessel and the coil of the halide-resistant portion. The high-pressure discharge lamp according to claim 1, wherein the high-pressure discharge lamp is formed between the two. 3. The high-pressure discharge lamp according to claim 1, wherein the ceramic sleeve does not surround a portion other than a base end of the halide-resistant portion of the power supply conductor. 4. The apparatus according to claim 1, further comprising a stopper proximate to a tip of the ceramic sleeve.
A high-pressure discharge lamp according to any one of the preceding claims. 5. 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.