JP2001351575A - High pressure discharge lamp and lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high pressure discharge lamp and a lighting system using the high pressure discharge lamp restrained from degradation of sealing strength and reliability of a light transmitting ceramics discharge vessel enclosed in an outer tube. SOLUTION: The transition temperature Tg of ceramics sealing compound seals 4 for sealing clearances between a small diameter cylinder 1b of the light transmitting ceramics discharge vessel 1 and electrodes 2A, 2B inserted in the small diameter cylinder 1b, and the softening temperature Ts of glass constituting an outer tube OB enclosing an arc tube IB comprising the light transmitting ceramics discharge vessel 1, the electrodes 2A, 2B and a discharge medium, and formed with a pinch seal ps opposed to the small diameter cylinder part 1b, satisfy an expression Ts-Tg<=100. Or the transition temperature Tg of the ceramics sealing compound seals and the working temperature Tw of the glass constituting the outer tube may satisfy an expression Tw-Tg<=400.

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 translucent ceramics discharge vessel and a lighting device using the same.

[0002]

2. Description of the Related Art In recent years, high-pressure discharge lamps having a translucent ceramics discharge vessel having advantages of longer life and higher efficiency than conventional quartz glass discharge vessels have been developed and are being widely used. In addition, the present inventors have developed a small high-pressure discharge lamp having a rated power consumption of about 25 W or less utilizing the above characteristics. Such a high-pressure discharge lamp is superior in luminous efficiency and life as compared with a conventional high-pressure discharge lamp having an arc tube made of quartz glass. Also, because of its small size, there is a strong demand as a light source alternative to halogen bulbs. This is because the light emitting area is small, and the efficiency of the reflector can be improved by using a point light source, in addition to features such as high efficiency and long life as compared with the halogen bulb.

[0003]

However, in order to cope with the replacement of the halogen bulb, it is necessary to make the entire high-pressure discharge lamp including the outer tube for accommodating the arc tube to the same size and shape as the halogen bulb.

However, this type of high-pressure discharge lamp uses a light-transmitting ceramic discharge vessel having a small-diameter cylindrical portion to constitute an arc tube, and a power supply conductor is inserted into the small-diameter cylindrical portion to seal the ceramic. It has a unique sealing structure that seals with a compound seal. Therefore, when the arc tube is housed in the outer tube and the outer tube is heated and sealed, the sealing portion of the arc tube is also heated, and the sealing strength and reliability are likely to be deteriorated. And it turned out that the probability of leading to an early leak increases.

Therefore, the present inventor has conducted a detailed investigation on the cause of the above problem, and as a result, has found a solution.
The present invention has been made.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a high-pressure discharge lamp in which the sealing strength and reliability of a light-transmitting ceramic discharge vessel housed inside an outer tube are hardly degraded, and a lighting device using the same. I do.

[0007]

The high-pressure discharge lamp according to the present invention comprises a surrounding portion surrounding the discharge space and a small-diameter cylindrical portion which is arranged in communication with at least one end of the surrounding portion and has a smaller inside diameter than the surrounding portion. A translucent ceramics discharge vessel, an electrode that is inserted into the small-diameter cylindrical portion of the translucent ceramics discharge container and extends while forming a small gap between the inner surface of the small-diameter cylindrical portion and faces the surrounding portion, At least a portion of the small-diameter cylindrical portion of the translucent ceramics discharge vessel at the end face side is sealed, and the transition temperature is Tg. A ceramic sealing compound seal, and the discharge medium sealed in the translucent ceramics discharge vessel are sealed. Provided arc tube; softening temperature T _S
Is a glass that satisfies the following formula, a pinch seal portion is formed at least at one end, and an outer tube that hermetically accommodates the arc tube in a state where the small-diameter cylindrical portion of the transparent ceramic discharge vessel faces the pinch seal portion. And a lead wire connected to an electrode of the arc tube while being airtightly penetrated through a pinch seal portion of the outer tube; and T _S −Tg ≦ 100. In the following inventions, the definitions and technical meanings of terms are as follows unless otherwise specified. Hereinafter, each component of the arc tube, the outer tube, and the lead wire will be described in order.

[Arc Tube] The arc tube has at least a translucent ceramic discharge vessel, a power supply conductor, an electrode, and a discharge medium.

<Transparent ceramic discharge vessel>
"Translucent" in a translucent ceramics discharge vessel means
It is light-transmissive to the extent that light generated by discharge can be transmitted and guided to the outside, and may be not only transparent but also light-diffusing. When the translucent ceramics discharge vessel has a small-diameter cylindrical portion, it is sufficient that at least the surrounding portion has a light-transmitting property with respect to the radiation to be used. May not be mainly derived.

Therefore, the "translucent ceramics discharge vessel" is defined as a single-crystal metal oxide such as sapphire at least in the surrounding portion, a polycrystalline metal oxide such as a translucent hermetic aluminum oxide (alumina ceramic), Yttrium-aluminum-garnet (YA
G) means a discharge vessel made of a material having light transmittance and heat resistance such as yttrium oxide (YOX) and polycrystalline non-oxide such as aluminum nitride (AlN).

In order to manufacture a translucent ceramics discharge vessel, the surrounding portion and the small-diameter cylindrical portions at both ends of the surrounding portion can be integrally formed from the beginning. However, for example, the hollow spherical portion forming the surrounding portion and the small-diameter cylindrical body connected to the end of the spherical portion to form the small-diameter cylindrical portion are separately pre-sintered and then joined as required, By sintering the whole, an integral translucent ceramics discharge vessel can be formed. Furthermore, for example, a cylinder forming an enclosing portion, a pair of end plates that are fitted to and closed on both end surfaces of the cylinder, and a pair of small-diameter cylinders that are fitted into a center hole of the end plate to form a small-diameter cylindrical portion. Can be separately sintered and fitted as required, and the whole can be sintered to form an integral discharge vessel. Furthermore, in addition to the above both-end sealing structure,
A translucent ceramics discharge vessel having a one-sided sealing structure can also be used. In this case, the whole can be integrally formed from the beginning as in the case of the above-described both-end sealing structure,
The spherical body or the bottomed cylindrical body having the opening and the cylindrical body forming the small diameter cylindrical part may be separately pre-sintered, then fitted together as required, and sintered as a whole to be integrated. Further, the small-diameter cylindrical portion may be one common to a pair of electrodes, or a pair may be formed separately and substantially in parallel. When a common small-diameter cylindrical portion is provided, an intermediate cylindrical body made of a ceramic having a pair of through holes is inserted into the small-diameter cylindrical portion, and then the power supply conductor is inserted and sealed. A required space between the small-diameter cylindrical portion and the electrode can be secured.

Further, in the present invention, the inner volume of the translucent ceramics discharge vessel is not limited, but in order to obtain a small high-pressure discharge lamp, the translucent ceramics discharge vessel must be 0.05 cc or less. Preferably 0.04cc
It is better to do the following. In this case, the translucent ceramic discharge vessel has a total length of 30 mm or less, preferably 10 to 25 mm.
mm.

<Regarding the Electrodes> The electrodes are inserted into the small-diameter cylindrical portion of the translucent ceramics discharge vessel so as to extend while forming a small gap with the inner surface of the small-diameter cylindrical portion, and to face the surrounding portion. Located in. Note that “facing the enclosing portion” includes an aspect that is located in the enclosing portion and an aspect that is not located in the enclosing portion but is located in the small-diameter cylindrical portion so as to generate a discharge in the enclosing portion. The electrodes can be formed integrally with the refractory portion in the AC lighting type, but can be formed integrally with the cathode in the DC lighting type, but the anode can be formed separately. it can.

Further, the electrode can be formed of a plate material such as tungsten having a cylindrical shape. As a result, the surface area of the electrode increases, and the electrode surface current density, which is one of the factors determining the rate of sputtering in the glow discharge mode in the glow-arc transition, decreases, and accordingly the cathode drop voltage decreases. Sputtering is reduced. Further, since the heat capacity can be reduced, the glow-arc transition time is shortened, and the electron emission performance is improved by the edge effect, and the starting voltage is lowered.

<About Seal> The seal seals at least a portion on the end face side of the small-diameter cylindrical portion of the translucent ceramics discharge vessel.

In addition, the seal generally has a melting point of 1300 ° C. or more and a thermal expansion coefficient close to that of the translucent ceramics in order to seal the translucent ceramics discharge vessel which becomes high in temperature during lighting. It can be formed using a ceramic sealing compound such as a Dy-Si-Al-based compound. This ceramic sealing compound is also called a frit, and changes depending on its composition. For example, the transition temperature Tg is 870 to 880 ° C., and the softening temperature Ts is about 900.
１1400 ° C. In the compound for ceramic sealing, the softening temperature Ts and the working temperature Tw are the same.

Thus, the ceramic sealing compound is formed into a ring-shaped pellet by molding a glassy raw material prepared in advance. Next, the pellet is placed on the end of the small-diameter cylindrical portion of the translucent ceramic discharge vessel, and then is allowed to enter a minute gap between the power supply conductor and solidify, so that the seal has a predetermined shape. Formed in position.

That is, in order to form the seal at a predetermined position, the translucent ceramic discharge vessel is fixed with the portion to be sealed up, and a solid ceramic sealing member is attached to the end of the small-diameter cylindrical portion to be sealed. Place the heating compound and heat. Then, the ceramic sealing compound melts by heating and cools when it enters the portion of the small-diameter cylindrical portion to be sealed.
Thereby, the seal is solidified and surrounds the sealing portion so as not to be exposed to the discharge space side in the translucent ceramic discharge vessel, and hermetically seals the portion to be sealed of the small-diameter cylindrical portion. At the same time, the gap between the end face of the small-diameter cylindrical portion and the portion of the electrode opposed thereto is hermetically sealed. The electrode is fixed to a predetermined position with respect to the translucent ceramic discharge vessel by the seal formed in this way,
The translucent ceramic discharge vessel is hermetically sealed.

Furthermore, in the case of small high-pressure discharge lamps, the refractory parts of the electrodes or of the power supply conductors can be axially coated over a distance of 0.2 to 3 mm by means of seals. When the covering distance of the electrode or the refractory portion is less than 0.2 mm, the sealing portion is easily corroded by a discharge medium such as a halide during lighting, and when it exceeds 3 mm, cracks are not easily generated.

<Discharge Medium> The discharge medium contains at least a rare gas as a starting gas and a buffer gas, and is sealed in a translucent ceramic discharge vessel so as to exhibit a pressure of about 1 atm or more during lighting.

The discharge medium contains a luminescent substance or a compound thereof, such as a metal halide or amalgam.

Further, the discharge medium may contain mercury as a buffer vapor.

On the other hand, since the rare gas is not essentially limited to a specific gas, generally, argon, xenon, neon, or the like can be used alone or as a mixture. Neon and argon can be mixed and sealed when required, such as when it is desired to reduce the glow current at the time of transition or to lower the discharge starting voltage. In this case, argon is 0.1 to 15%, preferably 1% in partial pressure with respect to neon.
It can be mixed up to 0%. In addition, neon and argon can be generally used at a filling pressure of 10 to 70 kPa, preferably 13 to 27 kPa. As a result, the starting voltage is reduced to 3 kV or less, preferably to about 2 kV, so that the load characteristics are small as in a ballast for a fluorescent lamp as described later, and are continuous from a secondary open voltage to a secondary short-circuit current. By using a high-frequency ballast provided with, it is possible to satisfactorily light without using an igniter. If the filling pressure is less than 10 kPa, the glow
The arc transition time becomes longer, and blackening due to sputtering or evaporation of tungsten of the electrode material increases. On the other hand, when the filling pressure exceeds 27 kPa, the starting voltage of the high-pressure discharge lamp increases, and the glow power increases.

Further, in addition to neon and argon, other rare gases can be sealed as required.

In the case where the high-pressure discharge lamp is a metal halide lamp, when a metal halide of a luminescent metal is used as a discharge medium, the halogen constituting the metal halide may be one or more of iodine, bromine, chlorine and fluorine. Seeds can be used.

The metal halide of the luminescent metal has a luminescent color,
In order to obtain radiation having desired luminescence characteristics with respect to the average color rendering index Ra and the luminous efficiency, further according to the size of the translucent ceramics discharge vessel and the lamp power,
Any desired selection can be made from known metal halides. For example, sodium Na, thallium Tl
And one or more halides selected from the group consisting of rare earth metals such as dysprosium Dy.

Further, instead of an appropriate amount of mercury as the buffer vapor, a metal having a relatively high vapor pressure and low luminescence in the visible light region, or a non-luminous metal, for example, a halide such as aluminum can be sealed.

<Other Configurations of Arc Tube> The following configurations can be added as necessary when implementing the present invention. However, these configurations can be employed arbitrarily, and do not limit the technical scope of the present invention.

1. Power Supply Conductor In order to supply power to the electrodes, a power supply conductor can be used for at least one small-diameter cylindrical portion of the translucent ceramics discharge vessel. The power supply conductor functions to apply a voltage between the electrodes from the power supply via the ballast to start the high pressure discharge lamp and to introduce and ignite the current.

Further, the configuration of the power supply conductor may be different depending on the sealing structure of the translucent sealed ceramic discharge vessel. That is, any of a power supply conductor sealing structure and a button sealing structure may be used.

2. Power Supply Conductor Sealing Structure In the power supply conductor sealing structure, a part of the power supply conductor is inserted into the small-diameter cylindrical portion of the translucent ceramic discharge vessel, and the small-diameter cylindrical portion and the power-supply conductor are sealed by the seal described above. The gap is hermetically sealed, and the electrode is supported at a predetermined position. The power supply conductor in the sealing structure includes a sealing portion and a fire-resistant portion connected to the tip of the sealing portion.

The term "sealing portion" means a transparent ceramic discharge vessel with a seal described later, between the small-diameter cylindrical portion and the sealing portion, or, if necessary, a ceramic tube between them. Any material can be used as long as it is a material suitable for sealing by intervening, and niobium, tantalum, titanium, zirconium, hafnium, vanadium, or the like can be used. When aluminum oxide is used as the material of the translucent ceramics discharge vessel, niobium and tantalum are suitable for the sealing portion because the average thermal expansion coefficient is almost the same as that of aluminum oxide. The difference is also small for yttrium oxide and YAG. When aluminum nitride is used for a translucent ceramics discharge vessel,
Zirconium is preferably used for the sealing portion.

The "refractory portion" has a high melting point enough to withstand high temperatures during operation of the high-pressure discharge lamp and has a corrosion resistance to a discharge medium existing in the translucent ceramic discharge vessel. It means that the portion is made of a conductive material. For example, tungsten, molybdenum or an alloy containing these as a main component, furthermore, platinum or an alloy thereof, but not only a single kind of metal, but also may be formed by joining a plurality of the above metals, or a cermet. And so on. In addition, the refractory part
It may be an empty rod-shaped solid body or a hollow cylindrical or pipe-shaped one having a thickness of 10 to 300 µm. For a small high-pressure discharge lamp, for example, having a rated power consumption of 30 W or less, preferably about 20 W, when the refractory portion is rod-shaped,
A diameter of 0.25 mm or less is suitable. In the case of a cylindrical shape, a thickness of 10 to 100 μm is appropriate. Furthermore, in the case of a cylindrical shape, not only a complete pipe but also a cylindrical shape in which a thin plate is curved to form a joint having a slight gap may be used. The refractory part is not only formed separately from the electrode, but also, if necessary, the electrode is formed integrally with the refractory part of the power supply conductor, for example, the tip of the refractory part acts directly as an electrode. A configuration in which the electrode shaft also serves as a refractory portion and is directly connected to the tip of the sealing portion is acceptable.

A seal, which will be described later, is adhered to the base end of the refractory portion. By constructing the refractory portion as described above, even if the coefficient of thermal expansion of the seal is obviously small, the thermal expansion coefficient is reduced. The refractory part absorbs the stress caused by the difference.

3. Button Sealing Structure In the button sealing structure, a cermet button is brought into contact with the end surface of the small-diameter cylindrical portion of the translucent ceramic discharge vessel, and a ceramic sealing compound seal is inserted between them. In this structure, a button sealing structure can be adopted instead of the power supply conductor sealing structure. The electrode is fixed on the inner surface of the cermet button, and the power supply conductor is fixed on the outer surface. In addition, a part of the seal penetrates between an end face side portion of the small-diameter cylindrical portion of the light-transmitting ceramic discharge vessel and an electrode opposed thereto to seal the light-transmitting ceramic discharge vessel.

4. Slight Gap A small gap called a capillary is formed between the refractory portion or electrode of the power supply conductor and the inner surface of the small-diameter cylindrical portion in the power supply conductor sealing structure. A part of the small gap located on the end side of the small-diameter cylindrical portion is filled with the seal, but the remaining discharge medium stays in the liquid phase state during lighting in the remaining part. Then, the temperature of the liquid surface on the discharge space side becomes the coldest part, but by appropriately setting the width and length of the gap and the amount of the discharge medium filled,
The temperature of the seal can be set as desired as well as the desired coldest part temperature.

The width of the slight gap formed between the inner surface of the small-diameter cylindrical portion of the light-transmitting ceramic discharge vessel and the power supply conductor is not particularly limited in the present invention, but is a relatively small high-pressure discharge lamp, that is, a transparent glass. When the inner volume of the optical ceramic discharge vessel is 0.1 cc or less, preferably 0.05 cc or less and / or the rated power consumption is 20 W or less,
It is preferably 0.21 mm or more.

According to the study of the present inventors, it has been found that a good compact lamp cannot be obtained even if the prior art is scaled down and applied to the compact high-pressure discharge lamp. In other words, when the lamp power is reduced, it is necessary to secure an appropriate coldest part temperature in order to secure luminous efficiency, and it is essential to reduce the heat capacity of the entire transparent ceramics discharge vessel. . At this time, if the shape and electrode dimensions of the light-transmitting ceramic discharge vessel are simply and proportionately reduced in view of the case where the lamp power is relatively large, leakage occurs in the sealed portion in a short time after lighting. It is considered that this is because, when the translucent ceramics discharge vessel is made smaller, the form of heat transfer from the heating element such as discharge plasma to the sealed portion, that is, the balance of heat conduction, convection, and radiation is lost.

5 Relationship between Internal Volume of Translucent Ceramic Discharge Vessel and Linear Transmittance When the internal volume is 0.1 cc or less, preferably 0.05 cc or less, the average linear transmittance of the bulging portion is 10%. Above, preferably 20% or more, more preferably 30% or more.

The linear transmittance is measured at a wavelength of 550 nm. The “average linear transmittance” is a value obtained by arithmetically averaging linear transmittance data measured at five different positions with respect to the target portion.

In the case of a light-transmitting ceramic discharge vessel having a small internal volume as described above, if the average linear transmittance of the hollow portion is 20% or more, the optical efficiency of the combined optical system, for example, a reflecting mirror (equipment efficiency) ) Can be increased,
Cracks are less likely to occur in the translucent ceramic discharge vessel.

The inner volume of the translucent ceramics discharge vessel was determined by placing the vessel in water, filling the inside with water, closing the open ends of both small-diameter cylindrical portions, and taking out the water from the water. Measure and measure the water.

[Outer Tube] In general, an outer tube is used to mechanically protect the arc tube by hermetically storing the arc tube therein, or to maintain the operating temperature of the arc tube within a desired range. The means used.

In the high-pressure discharge lamp of the present invention, a translucent ceramics discharge vessel is hermetically housed in an outer tube for keeping heat and shutting off the atmosphere. To achieve this, the interior of the outer tube can be evacuated and filled with vacuum or low pressure or an inert gas such as a noble gas or nitrogen.

The outer tube has appropriate translucency, airtightness, heat resistance and workability. Further, the outer tube satisfies a predetermined condition in a relative thermal relationship with a ceramic sealing compound seal used for sealing the translucent ceramic discharge vessel of the arc tube and the power supply conductor. It is important to set the material, sealing structure, size, and the like as described above. That is, in the present invention,
The outer tube is made of glass whose softening temperature Ts satisfies the following formula with respect to the transition temperature Tg of the seal of the compound for ceramic sealing.

Ts−Tg ≦ 100 In the above equation, the softening temperature Ts may be not only higher than the transition temperature Tg but also lower. The temperature difference in such a case has a negative value, but must be 100 or less. If this condition is satisfied, it is meaningless that the glass has a specific composition. For example, alumina silicate glass (softening temperature Ts = 924-928 ° C.), Pyrex (registered trademark) glass (softening temperature Ts = 924-928)
C) can be used. When the above-mentioned glass is used for the outer tube, the lead wire can be directly sealed without using a sealing metal foil. Therefore, the heat capacity of the pinch seal portion can be minimized by reducing the axial dimension, and thus the volume, of the pinch seal portion, which contributes to reducing the effect of the pinch seal on the arc tube seal. The temperature difference is preferably 60 or less.

Further, the outer tube can adopt either one-sided sealing or both-sided sealing as required. Note that "single sealing" refers to a structure in which a pinch seal portion is formed only at one end of an outer tube, and the other end is closed without forming a sealing portion. On the other hand, “both ends sealed” refers to a structure in which pinch seal portions are formed at both ends of the outer tube. When the outer tube has a single sealed structure, it is suitable for aligning the axis of the high-pressure discharge lamp with its optical axis when the high-pressure discharge lamp is used in combination with a reflecting mirror. Further, the both-end sealing structure is suitable for disposing the optical axis of the reflecting mirror and the axis of the high-pressure discharge lamp at right angles.

[Regarding the Lead Wire] The lead wire passes through the pinch seal portion of the outer tube in an airtight manner and is led out to the outside, and emits light directly in the outer tube or indirectly via, for example, a power supply conductor or a bridge conductor. Connect to the feed conductor of the tube. And it functions as a conductive means when electric energy is introduced into the arc tube from an external lighting circuit means. Also, if necessary, as will be described later, the light-emitting tube may function as a means for supporting the arc tube at a predetermined position inside the outer tube, or for supporting a high-pressure discharge lamp when disposed in a lighting device outside the outer tube. Can be configured. In addition,
“Bridge conductor” refers to a conductor that connects a lead wire and a power supply conductor or electrode while bridging.

Further, the lead wire may protrude outward from the outer tube along the lamp axis, or may be in contact with the pinch seal portion. In an aspect that projects outward from the outer tube, the projecting portion may directly constitute a connection pin,
The structure which functions as a connection line to a base may be sufficient. On the other hand, the aspect in contact with the pinch seal portion has a so-called non-stick structure.

Further, the lead wire can be constructed so as to have a structure and a material suitable for connection with the base and the high-frequency output terminal of the lighting circuit means. For this reason, even if at least a sealing metal is used for the portion penetrating the pinch seal portion of the outer tube, the contact resistance is small for the portion connected to the base and the lighting circuit means, and there is no problem in mechanical strength. Connection means made of brass, copper, or the like can be used.

[Other Configurations] 1. Support of arc tube The arc tube can be supported at a predetermined position in the outer tube by any of the following modes.

(1) The arc tube is supported only by the lead wires.

(2) A support frame for abutting the inner wall of the outer tube is attached to the lead wire supporting the arc tube.

(3) The lead wire is bent and brought into contact with the inner wall of the outer tube.

(4) A lead wire connected to the arc tube is directly or indirectly locked to the inner surface of the tip-off portion of the outer tube via another member.

(5) Instead of the lead wire, the transparent ceramic discharge vessel of the arc tube is directly supported by, for example, an elastic support band.

2. Power receiving means In order to connect the high pressure discharge lamp to the lighting circuit means, a power receiving means can be attached to the outer tube. Power receiving means include bases used for various lamps, caps for hanging ceiling rosettes used to supply power to ceiling lighting fixtures, and insulated wires for directly connecting high-frequency output terminals of lighting circuit means. Can be appropriately selected and adopted.

When a base is employed as the power receiving means, various known bases can be appropriately selected and used. However, if emphasis is placed on substitutability with existing incandescent lamps and bulb-type fluorescent lamps, it is better to use bases having the same specifications as these.

As the base, any existing base type such as a screw base, a pin base, and a bayonet base can be arbitrarily used. However, a small high-pressure discharge lamp with a lamp power of 50 W or less, preferably 20 W or less, can be configured to be able to replace a halogen bulb. Therefore, if necessary, use the same E11 screw cap as a halogen bulb for commercial power supply voltage. Can be.

Since the base is provided at one end of the outer tube, the high-pressure discharge lamp can be easily and easily attached to and detached from the lamp socket by being mounted on the lamp socket.

Accordingly, it is possible to substitute for a halogen bulb.

3. Getter In order to adsorb impurity gas in the outer tube, a getter can be arranged in the outer tube as is generally performed. In this case, the getter can be supported by a suitable member such as a translucent ceramics discharge vessel or a connection conductor.

4. Metal Coil In order to reduce the starting voltage of the high-pressure discharge lamp, a metal coil can be provided in the small-diameter cylindrical portion of the translucent ceramic discharge vessel. The metal coil is wound around at least one of the pair of electrodes around the outer periphery of the small-diameter cylindrical portion of the translucent ceramics discharge vessel through which the electrode is inserted, and has one end at the same potential as the other electrode. Connected. That is, the metal coil can be provided for both or one of the pair of electrodes. Then, a high voltage is applied between the metal coil and the electrode facing the metal coil at the time of starting.

Therefore, one end of the metal coil is "connected so as to have the same potential as the other electrode", which means that the electrode facing the metal coil via the small-diameter cylindrical portion is regarded as one electrode. This means that one end of the metal coil is connected to the power supply conductor connected to the other electrode or the connection conductor connected thereto.

It is preferable that the metal coil is wound so as to be as close as possible to the outer surface of the small-diameter cylindrical portion.

Further, a heat-resistant conductive metal such as molybdenum and niobium can be used for the metal coil.
Therefore, when the connection conductor is used to supply power to the arc tube, the same metal can be used for the metal coil and the connection conductor, but different metals may be used.

[Operation of the Present Invention] In the high-pressure discharge lamp of the present invention, the transition temperature Tg of the seal of the ceramic sealing compound for sealing the small-diameter cylindrical portion of the translucent ceramic discharge vessel of the arc tube is determined. Since the difference from the softening temperature Ts of the glass constituting the outer tube is set to be 100 or less, the portion to be sealed of the outer tube is heated to melt the glass and then pinch-sealed. Throughout the process, the arc tube seal is less likely to be overheated. For this reason, the strength and reliability of the arc tube seal do not easily deteriorate.

On the other hand, when the difference between the transition temperature Tg of the seal of the ceramic sealing compound and the softening temperature Ts of the glass constituting the outer tube exceeds 100, the seal of the arc tube is overheated. This is not possible because the strength and reliability of the seal deteriorate.

The high pressure discharge lamp according to the second aspect of the present invention is the high pressure discharge lamp according to the first aspect, wherein the transition temperature Tg of the seal of the compound for ceramic sealing and the softening temperature T _S of the glass of the outer tube are lower. It is characterized by satisfying the expression.

T _S -Tg ≦ 60 The present invention defines a preferable relationship between the transition temperature Tg of the seal of the compound for ceramic sealing and the softening temperature T _S of the glass of the outer tube. That is, heat sealing softening temperature T _S and the transition temperature Tg as the difference between the small ceramic sealing compound in the glass of the outer tube is subjected during the pinch seal of the outer tube is reduced, the strength of the seal according to the present invention And deterioration of reliability is more unlikely to occur.

A high-pressure discharge lamp according to a third aspect of the present invention is a translucent ceramic discharge lamp having a surrounding portion surrounding a discharge space and a small-diameter cylindrical portion disposed in communication with at least one end of the surrounding portion and having a smaller inside diameter than the surrounding portion. An electrode which is inserted into the small-diameter cylindrical portion of the container and the translucent ceramics discharge container and extends while forming a slight gap between the inner surface of the small-diameter cylindrical portion and faces the surrounding portion; The end portion of the small-diameter cylindrical portion of the container is sealed, and the transition temperature is T
g ceramic sealing compound sealing, as well as the arc tube is provided with a discharge medium enclosed in the translucent ceramics discharge vessel; made of glass working temperature T _W satisfies the following formula, a pinch at least one end An outer tube in which a seal portion is formed, and a small-diameter cylindrical portion of the translucent ceramics discharge vessel faces the pinch seal portion, in which the arc tube is airtightly housed; and an airtightly penetrates the pinch seal portion of the outer tube. And a lead wire connected to the electrode of the arc tube.

[0072] T _W -Tg ≦ 400 present invention includes a transition temperature Tg of the sealing of the ceramic sealing compound, and defines the relationship between the working temperature Tw of the glass of the outer tube to a predetermined, the pinch seal portion of the outer tube This is to prevent the strength of the seal of the arc tube from being lowered or the reliability from being deteriorated when forming the light emitting tube.

That is, when working by softening the glass, it is necessary to heat the glass to a temperature higher than its softening temperature. This temperature is called a working temperature Tw. When a glass having an excessively high working temperature Tw is used for the outer tube, the amount of heat received by the seal of the arc tube during the processing becomes too large, and the temperature of the seal is excessively increased.
Reliability degrades. As a result of a study by the present inventors, it has been found that the above-mentioned problem is unlikely to occur if the above-mentioned condition is satisfied. Preferably, the range satisfies the following expression.

T _W −Tg ≦ 300 For example, the working temperature of alumina silicate glass is 1168 ° C. On the other hand, Dy-Si-Al
Since the transition temperature of the seal of the ceramic sealing compound of the system is 870-880 ° C., the difference between them is
288-298 ° C. The working temperature of Pyrex glass is 1027 ° C. Thus, the difference between the transition temperature of the seal is 147-157 ° C.

When the present invention is carried out, by satisfying the requirements of claim 1, a more suitable high-pressure discharge lamp can be obtained.

A high-pressure discharge lamp according to a fourth aspect of the present invention is a translucent ceramic discharge lamp having a surrounding portion surrounding a discharge space and a small-diameter cylindrical portion disposed in communication with at least one end of the surrounding portion and having a smaller inside diameter than the surrounding portion. An electrode which is inserted into the small-diameter cylindrical portion of the container and the translucent ceramics discharge container and extends while forming a slight gap between the inner surface of the small-diameter cylindrical portion and faces the surrounding portion; The end portion of the small-diameter cylindrical portion of the container is sealed, and the transition temperature is T
g ceramic sealing compound sealing, as well as the arc tube is provided with a discharge medium enclosed in the translucent ceramics discharge vessel; made of glass strain point point temperature T _SP satisfies the following formula, at least one end An outer tube in which a pinch seal portion is formed and an arc tube is hermetically housed in a state where the small-diameter cylindrical portion of the translucent ceramics discharge vessel faces the pinch seal portion; And a lead wire connected to the electrode of the arc tube.

T _SP <Tg The present invention defines the relationship between the transition temperature Tg of the seal of the ceramic sealing compound and the strain point temperature Tsp of the glass of the outer tube, and emits light when the pinch seal portion of the outer tube is formed. The purpose is to prevent the strength of the pipe seal from being reduced or the reliability from deteriorating.

That is, when the glass is processed, the glass must be gradually cooled to remove the processing distortion. However, it has been found that when the strain point temperature Tsp of the glass of the outer tube, that is, the temperature at the time of slow cooling, is high, the seal of the arc tube during the slow cooling is overheated, and the strength of the seal decreases and the reliability of the seal deteriorates. The annealing temperature range of the glass is between the annealing point temperature and the strain point temperature Tsp.

Therefore, in the present invention, the strain point temperature Tsp, which is the lower limit of the annealing temperature range, is defined in the above-described predetermined range in relation to the transition point temperature Tg of the compound for sealing the ceramics of the arc tube. As a result of a study by the present inventors, it has been found that the above-mentioned problems are unlikely to occur during slow cooling if the above-mentioned conditions are satisfied.

For example, alumina silicate glass is
The strain point temperature Tsp is 674 ° C. On the contrary,
Since the transition temperature of the seal of the Dy-Si-Al-based ceramic sealing compound is 870 to 880 ° C, the requirements of the present invention are satisfied. In addition, Pyrex glass is
The strain point temperature is 460 ° C. Therefore, it also satisfies the requirements of the present invention.

In implementing the present invention, by satisfying any one or more of the requirements of claims 1 to 3, a more suitable high-pressure discharge lamp can be obtained.

A high-pressure discharge lamp according to a fifth aspect of the present invention is the high-pressure discharge lamp according to any one of the first to fourth aspects, wherein the power supply protrudes outward from the end face side of the small-diameter cylindrical portion of the transparent ceramics discharge vessel. A power supply conductor;
The maximum difference between the average thermal expansion coefficient of the glass and the lead wire constituting the seal of the compound for ceramic sealing, the outer tube at 0 to 300 ° C. is within 50 × 10 ⁻⁷ / ° C .;

The present invention, in addition to the features of the preceding claims, suppresses thermal stress acting on the sealing of the ceramic sealing compound of the arc tube at the time of manufacturing or blinking of the high pressure discharge lamp, thereby reducing the occurrence of leakage. A preferred configuration is defined.

That is, a power supply conductor which is a component which can be related to a thermal stress acting on a seal of the ceramic sealing compound of the arc tube, a seal of the ceramic sealing compound, glass and a lead wire constituting the outer tube By configuring the maximum difference in the thermal expansion coefficients of the seals as described above, the thermal stress acting on the seal is greatly suppressed.
As a result, the occurrence of leakage at the sealing portion of the arc tube is significantly reduced.

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 end surface of the small-diameter cylindrical portion of the arc tube and the pinch of the outer tube facing the small-diameter tube portion. The distance between the inner end of the seal portion and the inner end is within 10 mm.

According to the present invention, the distance between the small-diameter cylindrical portion of the arc tube accommodated in the outer tube and the inner end of the pinch seal portion of the outer tube facing the predetermined portion is prescribed. The “inner end of the pinch seal portion of the outer tube” is defined as a light emitting tube of a mold mark formed on the outer surface of the pinch seal portion when the mold is pressed from the outside of the outer tube during the pinch seal. Side end.

Since the seal of the arc tube is separated from the pinch seal portion by a predetermined distance by having the above configuration, the portion to be sealed of the outer tube is heated at the time of pinch seal of the outer tube. In doing so, the heat is prevented from overheating the seal. For this reason, the strength and reliability of the seal are less likely to deteriorate.

A high pressure discharge lamp according to a seventh aspect of the present invention is the high pressure discharge lamp according to the fifth aspect, wherein an end portion of the power supply conductor protruding from the arc tube and a pinch seal portion of the outer tube facing the end portion. It is characterized in that the distance from the end is within 8 mm.

When the outer tube is pinch-sealed, if the power supply conductor protruding from the end surface of the small-diameter tube portion of the arc tube approaches the pinch seal portion, the power supply conductor is heated. The heat that has heated the power supply conductor conducts to the ceramic sealing compound seal according to the temperature gradient and raises the temperature, so depending on the protrusion length of the power supply conductor, the strength and reliability of the seal may deteriorate. .

Therefore, in the present invention, the distance between the inner end of the pinch seal portion and the power supply conductor is prescribed as described above.

Since the power supply conductor is separated from the pinch seal by a predetermined distance by the provision of the above-described configuration, when the portion to be sealed of the outer tube is heated during the pinch seal of the outer tube, To prevent the heat from overheating the seal via the feed conductor. For this reason, the strength and reliability of the seal are less likely to deteriorate.

The high pressure discharge lamp according to the invention of claim 8 is characterized in that, in the high pressure discharge lamp according to any one of claims 1 to 7, the outer tube has a pinch seal portion having a length of 12 mm or less. .

In the present invention, the axial length of the pinch seal portion formed on the outer tube is prescribed as described above. Since the length of the pinch seal portion of the outer tube affects the heat capacity of the pinch seal portion in proportion, the heat capacity is configured to be as small as possible without affecting the effect of the pinch seal. Further, the present invention is suitable for directly pinching and sealing a lead wire without using a sealing metal foil such as molybdenum foil, since the length of the pinch sealing portion can be easily reduced.

Then, the length of the pinch seal portion is 12 m
If it is less than m, the heat capacity of the pinch seal can be reduced while ensuring the pinch seal, so that the amount of heat required for forming the pinch seal portion can be reduced, and thus the outer tube does not need to be heated for a long time during lamp production. Therefore, deterioration of the strength and reliability of the seal of the ceramic sealing compound of the arc tube can be further suppressed.

According to a ninth 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 eighth aspects mounted on the lighting device main body. I have.

In the present invention, the lighting device is a broad concept including any device that uses the light emission of a high-pressure discharge lamp for some purpose. For example, the present invention can be applied to a bulb-type high-pressure discharge lamp, a lighting device, a headlight for a moving object, a light source device for an optical fiber, an image projection device, a photochemical device, a fingerprint discrimination device, and the like.

The “illumination device main body” refers to the remaining portion of the illumination device except for the high-pressure discharge lamp.

The "bulb-type high-pressure discharge lamp" means that the high-pressure discharge lamp is integrated with its lighting circuit means and further provided with a power receiving base, which is mounted on a lamp socket adapted to the base. Means an illumination device configured to be used as if lighting an incandescent light bulb.

Further, the lighting circuit means of the high pressure discharge lamp lighting device may be arranged on the lighting device main body, or may be arranged at a position separated from the lighting circuit body, for example, on the ceiling.

Next, when a bulb-type high-pressure discharge lamp is formed, a reflector for condensing the light emitted from the high-pressure discharge lamp so that desired light distribution characteristics can be obtained can be provided.

Further, in order to reduce the high luminance of the high-pressure discharge lamp, a glove or a cover having an appropriate light diffusing function can be provided instead of or in addition to the reflecting mirror.

Further, a die having a desired specification can be used. Therefore, for the purpose of replacing the conventional light source lamp, the same base as that of the conventional light source lamp may be employed.

When the lighting device is a lighting fixture, the lighting device body may be provided with a lighting circuit means and a lamp socket, and a high-pressure discharge lamp may be mounted on the lamp socket. it can. However, a configuration may be adopted in which the lighting circuit means is not provided, and a bulb-type high-pressure discharge lamp is attached to the lamp socket as a light source.

[0104]

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

FIG. 1 is a partially sectional front view showing a first embodiment of the high-pressure discharge lamp of the present invention.

FIG. 2 is a partially sectional front view showing the state of the wire valve before the base is attached.

FIG. 3 is a cross-sectional front view of an enlarged main part.

In each of the figures, the high-pressure discharge lamp includes an arc tube IB, a first lead wire CC1, and a second
Lead wire CC2, first and second metal coils CO
1, CO2, outer tube OB, a pair of external connection terminals OCT1,
It consists of OCT2, getter GT and base B.

<Regarding the arc tube IB> As shown in FIG. 3, the arc tube IB is made of a transparent ceramic discharge vessel 1, a first
And the second electrodes 2A and 2B, the power supply conductor 3, the seal 4, and the stagnation discharge medium 5, and have a vertically symmetric structure.

The translucent ceramics discharge vessel 1 includes an enclosing portion 1a and a pair of small-diameter cylindrical portions 1b and 1b. The surrounding portion 1a has both ends narrowed by a continuous curved surface and has a substantially spherical shape. The small-diameter cylindrical portion 1b is connected to the surrounding portion 1a by a continuous curved surface to form the translucent ceramics discharge vessel 1 by integral molding.

Each of the first and second electrodes 2A and 2B is made of doped tungsten and has a rod-shaped shaft portion 2a and a coil portion 2b. Shaft 2
a is inserted into the small-diameter cylindrical portion 1b with its tip protruding into the surrounding portion 1a, and the small-diameter cylindrical portion 1b and the first and second electrodes 2
A slight gap g is formed between A and 2B. The coil part 2b is mounted on the tip of the shaft part 2a.

The power supply conductor 3 includes a sealing portion 3a and a refractory portion 3b. The sealing portion 3a has a rod shape made of niobium, and has a distal end inserted into the small-diameter cylindrical portion 1b and a proximal end protruding outside the translucent ceramics discharge vessel 1. The refractory part 3b is composed of the electrodes 2A, 2B
Of the sealing portion 3a, and the base portion is discharge-welded to the tip of the sealing portion 3a.

The seal 4 is formed by melting and solidifying the ceramic sealing compound, so that the small-diameter cylindrical portion 1b of the translucent ceramics discharge vessel 1 has an end surface side and a sealing portion 2a opposed thereto. And the refractory portion 2b interposed therebetween to hermetically seal the translucent ceramics discharge vessel 1 to provide a power supply conductor sealing structure. It is covered so as not to be exposed inside. With the above sealing, the electrodes 2A,
2B is fixed to a predetermined position of the translucent ceramics discharge vessel 1.

In order to form the seal 4, the translucent ceramics discharge vessel 1 is set in a vertical position, and a ring-shaped pellet (not shown) of a compound for ceramics sealing is formed on the end face of the small-diameter cylindrical portion 1b. It is placed on the top, heats and melts the ring-shaped pellet, and enters the gap between the sealing portion 3a of the power supply conductor 3 and the inner surface of the small-diameter cylindrical portion 1b to be inserted into the small-diameter cylindrical portion 1b. In addition to covering the entirety of the refractory portion 3a, it also covers the base end of the refractory portion 3b.

The discharge medium is composed of a starting gas and a buffer gas containing neon and argon, a metal halide as a luminescent metal, and mercury as a buffer vapor, and is enclosed in a translucent ceramic discharge vessel 1.

Further, since the metal halide and mercury are sealed more than the amount to be evaporated, a part 5 thereof is retained in a liquid state in a slight gap g during stable lighting. The interface of the discharge medium 5 staying in the liquid state forms the coldest part.

<First and second lead wires CC1, CC
2> The first lead wire CC1 is made of a molybdenum wire, and its tip is connected to the power supply conductor 3 on the electrode 2A side,
The middle portion extends substantially parallel to and away from the axial direction of the translucent ceramics discharge vessel 1.

The second lead CC2 is made of molybdenum, and the tip is connected to the power supply conductor 3 on the electrode 2B side.

<First and second metal coils CO1,
Regarding CO2> The first metal coil CO1 is wound around the outer periphery of the small-diameter cylindrical portion 1b through which the first electrode 2A is inserted, and the coil end of the power supply conductor 3 is transparent. It extends in the axial direction of the conductive ceramic discharge vessel 1 and is connected to the power supply conductor 3 on the second electrode 2B side.

[0120] The second metal coil CO2 is wound around the outer periphery of the small-diameter cylindrical portion 1b into which the second electrode 2B is inserted, and the terminal on the side of the power supply conductor 3 is the first lead wire. Connected to CC2.

<Regarding Outer Tube OB> The outer tube OB is made of a hard glass T-shaped bulb and has a pinch seal portion p at the base end.
s is distal to the exhaust tip-off portion t is formed respectively, inside has been 10 exhaust - has become low vacuum state of about ^{2 Pa.}

The pinch seal portion ps is formed by heating the open end of the T-shaped valve and pinching it in a softened state.

The exhaust tip-off portion t is a mark that seals the outer pipe OB and then exhausts the inside of the outer pipe OB to seal off the exhaust pipe (not shown).

<Pair of external connection terminals OCT1, OCT2
About> A pair of external connection terminals OCT1 and OCT2 are
The first and second lead wires CC1 and CC2 are extended and integrally formed therewith, and protrude outward from the outer tube OB before the base B, which is a power receiving means, is attached.

<Regarding the Getter GT>
It is made of an rAl alloy and is supported on the first lead wire CC1 by welding.

<Regarding the base B> The base b is made of an E11 type screw base, and has a pair of external connection terminals OCT1 and OCT.
2 is connected as required, and is fixed to the pinch seal portion ps of the outer tube OB with an inorganic adhesive (not shown).

DESCRIPTION OF THE PREFERRED EMBODIMENTS The high-pressure discharge lamp shown in FIGS. 1 to 3 has the following specifications.

<Emitting tube> Translucent ceramic discharge vessel:
Made of translucent alumina ceramics, the overall length is 23 mm, the surrounding portion 1a has an outer diameter of 6 mm, an inner diameter of 5 mm (wall thickness of 0.5 mm),
The small-diameter cylindrical portion 1b has an outer diameter of 1.7 mm, an inner diameter of 0.7 mm (wall thickness of 0.5 mm), and a length of L28 mm. Electrode: Tungsten having a shaft portion and a coil portion of a diameter of 0.2 mm, a distance between the electrodes of 3.5 mm. Sealing part is niobium, diameter 0.64mm, 0
Average thermal expansion coefficient at ~ 300 ° C 75 × 10 ⁻⁷ /
The refractory part at ℃ also serves as the shaft part of the electrode.

Slight gap g: 0.25 mm Seal for ceramic sealing compound: Dy-Si
-Al system, transition temperature Tg 870 ° C, softening temperature Ts (working temperature Tw) 908 ° C, average coefficient of thermal expansion at 0 to 300 ° C 65 × 10 ⁻⁷ / ° C Discharge medium: Ne3% as starting gas and buffer gas
+ Ar is about 27 kPa, an appropriate amount of mercury and iodides of Na, Tl, and Dy as the luminescent metal (all of the luminescent metal halide do not evaporate during lighting, and the excess s
Are contained in such an amount as to stay in a slight gap g. <Metal coil> First and second metal coils: A 0.3 mm-diameter molybdenum wire is wound 7 turns at a winding pitch of 200% from the position adjacent to the enclosing portion, closely in contact with the outer periphery of the small-diameter cylindrical portion. The total length L1 is about 5 mm. <Outer tube> Material: Alumina silicate glass, softening temperature Ts 926 ° C., working temperature Tw 1168 ° C., strain point temperature Ts
p674 ° C, average thermal expansion coefficient 46 at 0 to 300 ° C
× 10 ⁻⁷ / ° C. <Lead wire>: Molybdenum wire having a diameter of 0.3 mm, 0 to 3
Average coefficient of thermal expansion at 00 ° C. (37 to 53) × 10
^-7 / ° C <Lamp specification> Tube outer diameter: 11 mm, overall length: 70 mm, light center distance: 49
mm Cap: E11 type Lamp power: 20 W Total luminous flux: 1800 lm, Luminous efficiency: 90 lm / W Color temperature: 3500 K Rated life: 8000 h FIG. 4 is an enlarged cross-sectional view of a high-pressure discharge lamp according to a second embodiment of the present invention. FIG.

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 transparent ceramics discharge vessel 1 is sealed by adopting a button sealing structure.

That is, a sealing button 6 made of cermet having substantially the same diameter as the end surface of the small-diameter cylindrical portion 1b is brought into contact with the end surface of the small-diameter cylindrical portion 1b. It is sealed. Also, the sealing button 6
Is molybdenum-alumina. The base end of the electrode 2 is connected to the inner surface of the sealing button 6 in advance. A power supply conductor 3 'made of molybdenum is connected to the outer surface.

Thus, the seal 4 of the ceramic sealing compound is formed at the end face side of the small-diameter cylindrical portion b.
It also penetrates between the opposing electrodes and seals them.

FIG. 5 is a partial center sectional front view showing a spotlight as a first embodiment of the lighting device of the present invention.

In the figure, the spotlight of the present embodiment comprises a spotlight body 11 and a high-pressure discharge lamp 12.
Consists of

The spotlight main body 11 mainly includes a ceiling mounting portion 11a, an arm 11b, a main body case 11c, a lamp socket 11d, a reflecting mirror 11e, a light shielding tube 11f, and a front glass 11g. The ceiling mounting portion 11a
Lighting circuit means (not shown) mounted on the ceiling to suspend the spotlight and arranged behind the ceiling
And receive power from here. The base end of the arm 11b is fixed to the ceiling mounting portion 11a. Body case 11
“c” has a container shape with an open front surface, and is pivotally attached to the tip of the arm 11b so as to be able to raise and lower in a vertical plane. Note that the two-dot chain line in the figure illustrates the range in which the elevation of the arm 11b can be adjusted with reference to the main body case 11c. The lamp socket 11d is suitable for an E11 base and is provided in the main body case 11c. The reflecting mirror 11e is disposed in the main body case 11c in front of the lamp socket 11d. The light-shielding cylinder 11f is provided at the center of the opening end of the reflecting mirror 11e. The front glass 11g is provided at an open end of the main body case 11c.

The high-pressure discharge lamp 12 has the same specifications as those shown in FIGS. And the high pressure discharge lamp 12
Is mounted on the spotlight body 11 by mounting the base B on the lamp socket 11d. Further, in a state where the high-pressure discharge lamp 12 is mounted, the light shielding tube 11f shields light from the distal end of the outer tube OB,
Prevent glare.

FIG. 6 shows a second embodiment of the lighting device of the present invention.
It is a principal part sectional front view which shows the light bulb shaped high pressure discharge lamp as embodiment.

In each of the figures, a bulb-type high-pressure discharge lamp
A high-pressure discharge lamp 12, a base 13, a reflecting mirror 14, lighting circuit means 15, a base 16 and a base 17 are provided. Hereinafter, each component will be described.

[Regarding the high pressure discharge lamp 12] The high pressure discharge lamp 12 has the same specifications as those shown in FIG.
The same parts as those in the drawings are denoted by the same reference numerals, and description thereof will be omitted.

The first and second starting auxiliary conductors CO1, C
O2 is composed of a 7-turn metal coil.

[Regarding the pedestal 13] The pedestal 13 is formed by molding a heat-resistant synthetic resin.
In the figure, a mounting portion 13b is provided on the upper outer peripheral edge. The mounting hole 13a is for mounting the high-pressure discharge lamp 12 and the reflecting mirror 14, and the pinch seal portion ps of the high-pressure discharge lamp 12 inserted therein and the reflecting mirror 14 to be described later.
Are fixed via an inorganic adhesive BC with the edge 14a of the same being concentric. The mounting portion 13b is fixed to an opening end of the base 16 described later.

[Reflector 14] The reflector 14 is disposed around the high-pressure discharge lamp 12 and has at least a light-emitting portion, that is, the surrounding portion 1 of the high-pressure discharge lamp 12.
a. The reflecting mirror 14 is fixed to the base 13. In the present embodiment, as described above, it is fixed together with the high-pressure discharge lamp 12. Further, the reflecting mirror 14 is formed into a bowl shape by glass molding, and at the same time, a cylindrical edge 14a at the top is integrally formed, and a reflecting surface 14b made of an aluminum vapor-deposited film is formed on the inner surface. . The edge portion 14a is inserted into the mounting hole 13a of the pedestal 13, and is fixed to the pedestal 13 with the inorganic adhesive BC. Further, a front glass 14c is provided in the opening of the reflecting mirror 13. Front glass 14
“c” is manufactured by molding transparent glass, and is hermetically sealed to the reflecting mirror 14 with a low-melting frit glass 18. Further, nitrogen is sealed as an inert gas in an internal space formed by the reflecting mirror 14 and the front glass 14b.

[Regarding Lighting Circuit Means 15] The lighting circuit means 15 is mounted mainly on the upper side in the drawing of the wiring board 15a, and receives the external connection terminals OCT1 and OCT2 of the high-pressure discharge lamp 12 from the upper surface in the drawing of the wiring board 15a. And is connected to the wiring board 15a as required.

[Regarding the Substrate 16] The substrate 16 has a cup shape, and a base 17 to be described later is mounted on the base thereof.
A peripheral step 16a is formed at the opening edge. The lighting circuit means 15 is housed inside the base 16. Further, the peripheral step 13b of the pedestal 13 is fitted to the peripheral step 16a of the opening edge, and is fixed by an adhesive. A hole for venting air or radiating heat is formed at an appropriate position of the base 16 or at a fitting portion with the pedestal as necessary.

[About the base 17] The base 17 is E26
The base 16 is mounted on the base of the base 16.

Next, the lamp specifications of the above embodiment will be described. Outer diameter: 50mm, Total length: 110mm Cap: E26 Rated voltage: 100V Power consumption: 23W Maximum luminous intensity: 4200cd Beam opening: 28 ° Beam luminous flux: 780lm Rated life: 8000h

According to the first and second aspects of the present invention, the transition temperature of the seal of the ceramic sealing compound for sealing between the small-diameter cylindrical portion of the translucent ceramic discharge vessel and the electrodes inserted into the small-diameter cylindrical portion. Tg and the softening temperature Ts of the glass constituting the outer tube containing the light-emitting tube comprising the translucent ceramics discharge vessel, the electrode and the discharge medium, and forming the pinch seal portion facing the small-diameter cylindrical portion. Satisfies the following expression, it is possible to provide a high-pressure discharge lamp in which the strength and reliability of the sealing compound of the ceramic sealing compound hardly deteriorate during pinch sealing of the outer tube.

Ts-Tg ≦ 100 According to the second aspect of the present invention, the transition temperature Tg of the seal of the ceramic sealing compound and the softening temperature Ts of the glass constituting the outer tube satisfy the following expression. Accordingly, it is possible to provide a high-pressure discharge lamp in which deterioration of the strength and reliability of the sealing compound of the ceramic sealing compound is less likely to occur during pinch sealing of the outer tube.

According to the third aspect of the present invention, the transition temperature Tg of the seal of the compound for ceramic sealing and the working temperature Tw of the glass constituting the outer tube satisfy the following expression. Accordingly, it is possible to provide a high-pressure discharge lamp in which the strength and reliability of the sealing compound of the ceramic sealing compound hardly deteriorate during pinch sealing of the outer tube.

Tw−Tg ≦ 400 According to the invention of claim 4, the transition temperature Tg of the seal of the ceramic sealing compound and the strain point temperature Tsp of the glass constituting the outer tube satisfy the following expression. By doing
It is possible to provide a high-pressure discharge lamp in which the strength and reliability of the sealing compound of the ceramic sealing compound hardly deteriorate during pinch sealing of the outer tube.

Tsp <Tg According to the fifth aspect of the present invention, in addition to the above, the power supply conductor is provided with a power supply conductor projecting outward from the end face side of the small-diameter cylindrical portion of the transparent ceramic discharge vessel. The seal, the glass constituting the outer tube and the pinch seal portion of the outer tube are airtightly penetrated and led out to the outside, and 0 to 0 of the lead wire connected to the power supply conductor of the arc tube in the outer tube.
The maximum difference in the average coefficient of thermal expansion at 300 ° C. is 50 × 10
By providing a temperature within ^-7 / ° C, a high-pressure discharge lamp is provided that suppresses thermal stress that acts on the sealing of the ceramic sealing compound of the arc tube when the high-pressure discharge lamp is manufactured or blinks, thereby reducing leakage. can do.

According to the invention of claim 6, in addition, the distance between the end face of the small-diameter cylindrical portion of the arc tube and the inner end of the pinch seal portion of the outer tube facing the arc tube is within 10 mm. Thereby, when the portion to be sealed of the outer tube is heated at the time of pinch sealing of the outer tube, the heat is prevented from overheating the seal, so that the strength and reliability of the seal are less likely to deteriorate. A high pressure discharge lamp can be provided.

According to the seventh aspect of the present invention, in addition, the distance between the end of the power supply conductor of the arc tube and the inner end of the pinch seal portion of the outer tube facing the end is within 8 mm. Therefore, when the portion to be sealed of the outer tube is heated at the time of pinch sealing of the outer tube, the heat is prevented from overheating the seal via the power supply conductor, thereby deteriorating the strength and reliability of the seal. It is possible to provide a high-pressure discharge lamp that is even less likely to occur.

According to the invention of claim 8, in addition, the outer tube is
Since the length of the pinch seal portion is 12 mm or less, the outer tube does not need to be heated for a long time during lamp production, so that deterioration in the strength and reliability of the ceramic sealing compound of the arc tube is further suppressed. A high-pressure discharge lamp can be provided.

According to the ninth aspect of the present invention, there is provided no first aspect.
It is possible to provide a lighting device having the above-mentioned effect.

[Brief description of the drawings]

FIG. 1 is a partial sectional front view showing a first embodiment of a high-pressure discharge lamp of the present invention.

FIG. 2 is a partial cross-sectional front view showing the state of the wire valve before the base is attached.

FIG. 3 is a cross-sectional front view of the same main part.

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

FIG. 5 is a partial cross-sectional side view showing a spotlight as a lighting device according to a first embodiment of the present invention;

FIG. 6 is a sectional front view of a main part showing a bulb-type high-pressure discharge lamp as a second embodiment of the lighting device of the present invention.

[Explanation of symbols]

 IB: arc tube 1: translucent ceramic discharge vessel 1a: surrounding portion 1b: small-diameter cylindrical portion 2A: first electrode 2B: second electrode 2a: shaft portion 2b: coil portion 3: power supply conductor 3a: sealing property Part 3b: Refractory part 4: Seal 5: Discharge medium in a stagnant state g: Slight gap CO2: First metal coil CO1: Second metal coil OB: Outer tube p: Pinch seal part t: Exhaust chip Off part CC1 ... first lead wire GT ... getter B ... base

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tatsuo Otabe 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Inside Toshiba Litec Corporation (72) Inventor Shihisa Kawatsuru 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo No. Toshiba Litec Corporation F-term (reference) 5C043 AA07 AA14 CC02 CD01 CD05 DD02 DD03 DD15 EB15 EC01 EC10

Claims (9)

[Claims] 1. A light-transmitting ceramic discharge vessel, comprising: a surrounding portion surrounding a discharge space; and a small-diameter cylindrical portion disposed in communication with at least one end of the surrounding portion and having a smaller inner diameter than the surrounding portion. An electrode that is inserted into the small-diameter tube portion and extends while forming a slight gap between the inner surface of the small-diameter tube portion and faces the surrounding portion, at least an end face side of the small-diameter tube portion of the transparent ceramic discharge vessel. A partially sealed and sealed ceramic sealing compound having a transition temperature of Tg, and an arc tube having a discharge medium sealed in a translucent ceramic discharge vessel; and a softening temperature Ts satisfying the following equation: It is made of glass, has a pinch seal at least at one end, and hermetically stores the arc tube in a state where the small-diameter cylindrical portion of the transparent ceramic discharge vessel faces the pinch seal. Tubes and; high-pressure discharge lamp, characterized in that it comprises a; the pinch seal portion of the outer tube through the airtight while being led to the outside, and a lead wire connected to the electrode of the arc tube. Ts−Tg ≦ 100 2. The transition temperature Tg of the seal of the ceramic sealing compound and the softening temperature Ts of the glass of the outer tube are as follows:
The high-pressure discharge lamp according to claim 1, wherein the following expression is satisfied. Ts−Tg ≦ 60 3. A light-transmitting ceramic discharge vessel comprising a surrounding portion surrounding a discharge space and a small-diameter cylindrical portion disposed in communication with at least one end of the surrounding portion and having a smaller inner diameter than the surrounding portion. An electrode which is inserted into the small-diameter cylindrical portion and extends while forming a slight gap between the inner surface of the small-diameter cylindrical portion and faces the surrounding portion, at least an end face side of the small-diameter cylindrical portion of the transparent ceramic discharge vessel. An arc tube having a ceramic sealing compound sealing part and having a transition temperature of Tg, and an arc tube including a discharge medium sealed in a translucent ceramic discharge vessel;
Is a glass that satisfies the following formula, a pinch seal portion is formed at least at one end, and an outer tube that hermetically accommodates the arc tube in a state where the small-diameter cylindrical portion of the transparent ceramic discharge vessel faces the pinch seal portion. A lead wire connected to an electrode of the arc tube while being led out through a pinch seal portion of the outer tube in an airtight manner. Tw−Tg ≦ 400 4. A translucent ceramic discharge vessel, comprising: a surrounding portion surrounding a discharge space; and a small-diameter cylindrical portion disposed in communication with at least one end of the surrounding portion and having a smaller inner diameter than the surrounding portion. An electrode which is inserted into the small-diameter cylindrical portion and extends while forming a slight gap between the inner surface of the small-diameter cylindrical portion and faces the surrounding portion, at least an end face side of the small-diameter cylindrical portion of the transparent ceramic discharge vessel. An arc tube having a ceramic sealing compound sealing a portion and having a transition temperature of Tg, and an arc tube including a discharge medium sealed in a translucent ceramic discharge vessel; and a strain point temperature Ts.
p is a glass that satisfies the following formula, a pinch seal portion is formed at least at one end, and a small diameter cylindrical portion of the translucent ceramics discharge container hermetically accommodates the arc tube in a state facing the pinch seal portion. A high-pressure discharge lamp, comprising: a tube; and a lead wire which is hermetically penetrated through a pinch seal of the outer tube and is led out to the outside, and connected to an electrode of the arc tube. Tsp <Tg 5. A power supply conductor protruding outward from an end face side of a small-diameter cylindrical portion of a translucent ceramics discharge vessel; the power supply conductor power supply conductor, a ceramic sealing compound seal, and an outer tube are constituted. Of glass and lead wire
The maximum difference in the average coefficient of thermal expansion at 300 ° C. is 50 × 10
The high-pressure discharge lamp according to any one of claims 1 to 4, wherein the temperature is within ^-7 / ° C. 6. The distance between the end surface of the small-diameter cylindrical portion of the arc tube and the inner end of the pinch seal portion of the outer tube facing the arc tube is 10 mm.
The high-pressure discharge lamp according to any one of claims 1 to 5, wherein the diameter is not more than mm. 7. A distance between an end of a power supply conductor protruding from an arc tube and an inner end of a pinch seal portion of an outer tube facing the end is 8 mm or less. A high pressure discharge lamp as described. 7. The method according to claim 1, wherein:
A high-pressure discharge lamp according to any one of the preceding claims. 8. The outer tube has a pinch seal having a length of 12 mm.
The high-pressure discharge lamp according to claim 1, wherein: 9. 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.