JP2001202920A - High-pressure discharge lamp, apparatus for turning on the same, and lighting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small high-pressure discharge lamp that is less likely to cause acoustic resonance phenomenon by using an improved translucent ceramic discharge container, an apparatus for turning on the lamp, and a lighting apparatus. SOLUTION: The lamp comprises a translucent ceramic discharge container, arranged in communication with an encircling portion encircling a discharge space and the end thereof with an inner surface thereof being approximately spherical and 6.5 mm or more in the inside diameter and with a small-diameter cylindrical part 1 mm or more in the inside diameter, a long electrode inserted through the small-diameter cylindrical part with a slight clearance formed in the surrounding thereof and with the tip thereof at the encircling part, and a discharge medium sealed in the translucent ceramic discharge container. This reduces and unifies acoustic resonance fundamental frequency. Therefore, it is possible to provided a high-pressure discharge lamp that causes no acoustic resonance phenomena if the same is turned on at a frequency of 100 kHz or higher, preferably 100 to 200 kHz and is provided with required lamp efficiency.

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 ceramic discharge vessel, a high-pressure discharge lamp lighting device and an illuminating device using the same.

[0002]

2. Description of the Related Art In recent years, small metal halide lamps having a lamp power of about 10 to 30 W have been developed as light sources for optical fibers and halogen light bulbs. Such a metal halide lamp can be treated as a point light source because its lamp efficiency is about 3 to 4 times as large as that of a halogen bulb and the light emitting portion is significantly smaller than that of a bulb-type fluorescent lamp.

[0003] Therefore, it can be said that the above-mentioned small metal halide lamp is a light source having advantages of a halogen bulb and a bulb-type fluorescent lamp. However, since it is a high-pressure discharge lamp, a ballast incorporating an igniter for generating a pulse voltage for generating a relatively high starting voltage at the time of starting, that is, a lighting circuit means including a current limiting means or a lighting circuit not incorporating an igniter Means and a separate igniter must be used. Of course, since the bulb-type fluorescent lamp is also a discharge lamp, it requires lighting circuit means with current limiting means, but the lighting circuit for the high-pressure discharge lamp is overwhelmingly large compared to that of the bulb-type fluorescent lamp. . For this reason, even if a small-sized high-pressure discharge lamp is developed, the light source, the ballast, that is, the lighting circuit means, and the lighting equipment will eventually become large as a system.

In order to avoid this problem, the inventor of the present invention has practically used a lighting circuit using a small-sized high-frequency inverter as a main component such as that used in fluorescent lamps, in particular, bulb-type fluorescent lamps. Was successful. This lighting circuit means is generally light in weight and inexpensive in addition to being compact because the circuit configuration is simple and operates at a high frequency.

[0005]

However, when the high-pressure discharge lamp is operated at a high frequency, there is a problem that the arc vibrates or goes out due to a so-called acoustic resonance phenomenon.

Hitherto, as means for avoiding this acoustic resonance phenomenon, lighting with a rectangular wave or lighting with a third harmonic superimposed on a fundamental wave has been proposed. But,
In any of these measures, the lighting circuit means tends to be large.

[0007] There is also a countermeasure for reducing the lighting frequency to be lower than the acoustic resonance fundamental frequency. However, in this measure, the upper limit of the lighting frequency is limited, so that downsizing of the lighting device is also limited.

On the other hand, there is a report that the acoustic resonance phenomenon can be avoided by setting the operating frequency to about 14 times or more of the fundamental frequency of the acoustic resonance. However, this study is directed to a high-pressure discharge lamp equipped with a quartz glass discharge vessel. It is unclear whether it can be applied to a high-pressure discharge lamp equipped with a translucent ceramics discharge vessel as it is. In addition, since the quartz glass discharge vessel has an essential characteristic that its material and its manufacturing method tend to vary in size due to its material and manufacturing method, in order to realize the above-mentioned report, it is necessary to overcome the characteristic and make the quartz glass discharge vessel It is necessary to manufacture containers without variation and to increase the size. Particularly, in a small high-pressure discharge lamp having a lamp power of 20 to 30 W, a decrease in the temperature of the coldest part of the lamp due to an increase in the size of the quartz glass discharge vessel results in a decrease in lamp efficiency, and thus has not been practically used.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a small-sized high-pressure discharge lamp in which a translucent ceramic discharge vessel is improved so that an acoustic resonance phenomenon is less likely to occur, a high-pressure discharge lamp lighting device and a lighting device using the same. Aim.

[0010]

A high-pressure discharge lamp according to the present invention is arranged so as to communicate with a substantially spherical surrounding portion having an inner diameter of 6.5 mm or more surrounding a discharge space and an end of the surrounding portion. A light-transmitting ceramic discharge vessel having an inner diameter of 1 mm or less and an inner surface having a small-diameter cylindrical portion; and being inserted into the small-diameter cylindrical portion while forming a slight gap between the light-transmitting ceramic discharge container and the inner surface of the small-diameter cylindrical portion. A pair of long electrodes, each having a distal end facing the surrounding portion of the light-transmitting discharge vessel; a distal end connected to the base end of the electrode, and at least an intermediate portion sealed to the light-transmitting discharge vessel and a proximal end being transparent. It is characterized by comprising an introduction conductor exposed to the outside from the light-emitting discharge vessel; and a discharge medium sealed in the light-transmitting ceramics discharge vessel.

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

<Transparent ceramic discharge vessel>
"Translucent ceramics discharge vessel" refers to a single crystal metal oxide such as sapphire and a polycrystalline metal oxide such as a translucent hermetic aluminum oxide or yttrium.
It means a discharge vessel made of a light-transmitting and heat-resistant material such as aluminum-garnet (YAG), yttrium oxide (YOX), and a polycrystalline non-oxide such as aluminum nitride (AlN). Note that the term “light-transmitting” means light-transmitting to the extent that light generated by electric discharge can be transmitted to the outside and may be not only transparent but also light-diffusing. Then, it is sufficient that at least the surrounding portion has a light-transmitting property, and if necessary, the small-diameter cylindrical portion may be light-shielding. In addition, the surrounding portion of the translucent ceramics discharge vessel mainly surrounds the positive column generated between the electrodes during lighting, but must be substantially spherical in order to make the acoustic resonance frequency a simple mode as much as possible.
In addition, "almost spherical" means that the inner surface of the surrounding portion has a spherical shape or a shape of an ellipsoidal sphere or an ellipsoidal sphere similar to the spherical shape, which can be expressed by sphericity described later. For example, it corresponds to 0.6 or more. In order to reduce the acoustic resonance fundamental frequency as much as possible, in the present invention,
The inner diameter of the surrounding portion needs to be 6.5 mm or more. And preferably, it is 7.2 mm or more. Note that the upper limit of the surrounding portion is allowed to a range where the temperature of the coldest portion of the surrounding portion can be maintained at a required value or more. Further, the inner diameter of the surrounding portion, when the inner surface shape of the surrounding portion is an ellipsoidal sphere or an ellipsoidal sphere,
It is determined by the arithmetic mean of the major axis and the minor axis. In addition, in the case of a similar inner surface shape, the inner diameter may be obtained according to the above.

On the other hand, the small-diameter cylindrical portion of the translucent ceramics discharge vessel is preferably used in order to regulate the heat capacity of the introduction conductor inserted therein as small as possible and to seal it with a ceramic sealing compound seal. For sealing, its inner diameter is 1 mm or less, preferably 0.8 mm
mm or less. The inner diameter of the small-diameter tube is 1 mm
If it exceeds, it is necessary to increase the inner conductor of the small-diameter cylindrical portion in accordance with the inner diameter of the small-diameter cylindrical portion for sealing, and therefore, the heat capacity of the introduced conductor becomes large and the temperature of the coldest part of the arc tube becomes too low. The required lamp efficiency cannot be obtained. Further, at the time of sealing, the seal of the ceramic sealing compound does not easily go around the tip of the introduction conductor on the inner side of the arc tube, so that the tip of the introduction conductor is not covered with the seal and a part thereof is likely to be exposed. Since the introduction conductor is generally made of a substance which is easily corroded by halogen, the life of the high-pressure discharge lamp becomes short unless it is completely covered with a seal. Further, if the gap between the small-diameter cylindrical portion and the introduction conductor is large, it is difficult to perform good sealing such that cracks are easily generated in the seal.

Furthermore, in order to manufacture a translucent ceramics discharge vessel, the central surrounding portion and the small-diameter cylindrical portion at both ends or one end of the surrounding portion can be integrally formed from the beginning. However, for example, a spherical portion forming the surrounding portion, and a small-diameter cylindrical body connected to both ends of the spherical portion to form a small-diameter cylindrical portion,
It is also possible to form an integral translucent ceramics discharge vessel by sintering the entire body after performing preliminary sintering separately and then joining them as required.

Furthermore, in the present invention, the total length of the translucent ceramics discharge vessel is 35 mm or less, preferably 10 mm or less.
３０30 mm. The inner volume is 0.10 cc or more, preferably 0.17 to 0.25 cc.

<Electrode> The electrode is made of tungsten or doped tungsten, and is elongated and inserted into the small-diameter cylindrical portion to form a small gap between the electrode and the inner surface of the small-diameter cylindrical portion. Either it protrudes into the enclosing portion, or its tip is in the small-diameter cylindrical portion and is in a position facing the enclosing portion.

At the tip of the electrode, a tungsten coil can be wound as necessary to increase the surface area and improve heat dissipation.

The intermediate portion of the electrode is desirably of a certain thickness in order to form a small gap, that is, a capillary as uniform as possible between the inner surface of the small-diameter cylindrical portion of the light-transmitting discharge vessel.

The base end of the electrode is fixed to a required position with respect to the translucent discharge vessel, and the base end of the electrode, which functions to introduce an electric current from the outside, is welded to the tip of the introduced conductor. And electrically and mechanically supported. In addition, a member such as molybdenum or cermet can be disposed at the distal end of the lead-in conductor and interposed between the proximal end of the electrode and a member such as molybdenum or cermet for the purpose of thermal buffering during welding. .

<Introducing conductor> An introducing conductor is a conductor that functions to apply a voltage between the electrodes, supply current to the electrodes, and seal the translucent ceramic discharge vessel. It is connected to the base end, and the base end is exposed outside the translucent discharge vessel. Note that “exposed to the outside of the light-transmitting discharge vessel” means that the light-emitting element may project from the light-transmitting discharge vessel to the outside or may not project from the light-emitting discharge vessel. It means that you are facing.

Further, as the introducing conductor, niobium, tantalum, titanium, zirconium, hafnium, vanadium and the like, which are conductive metals whose thermal expansion coefficient is similar to that of the translucent ceramics, can be used. When aluminum oxide such as alumina ceramic is used as the material of the translucent ceramics discharge vessel, niobium and tantalum are suitable for sealing 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 may be used for the introduction conductor.

Further, the introduction conductor may be used to support the entire high-pressure discharge lamp by supporting it.

Furthermore, the introduction conductor can be constituted by a rod-shaped body, a pipe-shaped body or a coil-shaped body of a sealing metal such as niobium. In this case, since niobium and the like have a strong oxidizing property, when the high-pressure discharge lamp is lit in a state where the lamp is exposed to the atmosphere, an oxidation-resistant conductor is further connected to the introducing conductor and the introducing conductor is not in contact with the atmosphere. Must be covered with, for example, a seal.

<Discharge Medium> The discharge medium contains at least a rare gas such as neon and argon as a starting gas and a buffer gas, and is sealed in a translucent discharge vessel so as to exhibit a pressure of about 1 atm or more during lighting. Is done. By using neon and argon as the noble gas, the glow power can be reduced and the glow-arc transition time can be extended appropriately. Thereby, evaporation of tungsten of the electrode material is suppressed, and blackening at the time of starting is significantly reduced. At the same time, since the starting voltage is reduced, the lighting circuit means is small, light, and inexpensive.

As the discharge medium, a metal halide and / or mercury can be used as a luminescent substance or a buffer vapor, if necessary.

Of neon and argon, argon is
Neon can be mixed in a partial pressure range of 0.1 to 10%.

When neon and argon are sealed as a rare gas, neon and argon can be generally used at a sealing pressure of 50 to 580 torr. If the filling pressure is less than 50 torr, the glow-arc transition time becomes longer, and blackening due to evaporation of tungsten in the electrode material increases. On the contrary, when the filling pressure is 58
If the pressure exceeds 0 torr, the starting voltage of the high-pressure discharge lamp increases, and the glow power increases, so that the object of the present invention cannot be achieved. Further, in addition to neon and argon, other rare gases can be filled as required.

When a metal halide is used as the discharge medium, one or more of iodine, bromine, chlorine and fluorine can be used as the halogen constituting the metal halide. The metal halide of the luminescent metal, the emission color, the average color rendering index Ra and the emission efficiency and the like to obtain radiation with desired emission characteristics, and further according to the size and input power of the transparent ceramic discharge vessel, Any desired selection can be made from known metal halides. For example, sodium Na,
One or more halides selected from the group consisting of lithium Li, scandium Sc and rare earth metals can be used.

Further, instead of a suitable amount of mercury as a buffer vapor, a metal having a relatively high vapor pressure and low light emission in the visible light region, or a non-light emitting metal such as aluminum or a halide such as aluminum can be sealed.

<Other Configurations> (1) Sealing of Compound for Ceramics Sealing An introduction conductor having an electrode disposed at the tip is inserted into a small-diameter cylindrical portion of a translucent ceramic discharge vessel, and a translucent ceramic discharge vessel is inserted. A seal of a ceramic sealing compound can be used to seal the conductive material and the introduction conductor. And
In order to seal using the ceramic sealing compound seal, it is applied between the introduction conductor and the small-diameter cylinder at the end face of the small-diameter cylinder, and is melted by heating to be interposed between the small-diameter cylinder and the introduction conductor. It penetrates, solidifies by cooling, and hermetically seals between them. The introduction conductor is fixed at a predetermined position by this seal.

The introduction conductor inserted into the small-diameter cylindrical portion is
Desirably, it is completely covered by the seal. Furthermore, the base end of the elongated electrode, which fixes the seal to the introduction conductor, is also a small distance, preferably 0.2 to 3 mm.
With such a configuration, the introduced conductor is less likely to be corroded by a discharge medium such as a halide.

(2) Starting Auxiliary Conductor When the inner diameter of the surrounding portion of the translucent ceramic discharge vessel is increased and the distance between the electrodes is correspondingly increased,
Since the starting voltage of the high pressure discharge lamp tends to increase,
By providing the starting auxiliary conductor as needed, the starting voltage can be reduced. It is effective that the starting auxiliary conductor is wound around the small-diameter cylindrical portion through which at least one electrode is inserted, and is constituted by a metal coil connected to have the same potential as the other electrode. . More preferably, the first electrode is wound around the outer periphery of one of the small-diameter cylindrical portions through which the first electrode is inserted, and one end of the small-diameter cylindrical portion is connected to the second electrode.
A first metal coil connected to have the same potential as that of the first electrode, and a first electrode wound around the outer periphery of the other small-diameter cylindrical portion through which the second electrode is inserted. And a second metal coil connected to have the same potential.

The starting auxiliary conductor made of the above-mentioned metal coil has the following features. 1) The number of turns is 4 turns or more. 2) One end thereof is located near the boundary with the surrounding portion of the transparent ceramics discharge vessel. 3) The winding pitch is 100-5
4) When the length is L _SA 1 and the length of the small-diameter cylindrical portion is L _SA 2, L _SA 1 / L _SA 2 is 0.3 to 1.0. Any one or a combination of a plurality of configurations can be added. (3) Outer tube The high-pressure discharge lamp of the present invention can be configured to be turned on when the translucent discharge vessel is exposed to the atmosphere.
However, if necessary, the translucent discharge container can be hermetically stored in the outer tube. In addition, a high-pressure discharge lamp having directivity can be obtained by forming the inner surface of the outer tube as a reflection surface having a light-emitting portion of the high-pressure discharge lamp as a focal point.

(3) Reflector The high-pressure discharge lamp of the present invention has a light-emitting portion smaller than that of the bulb-type fluorescent lamp, so that it is easy to collect light and is optically more advantageous than the bulb-type fluorescent lamp. However, if necessary, it can be used integrally with the reflecting mirror. In this case, a reflecting mirror may be formed on the inner surface of the outer tube accommodating the translucent ceramics discharge vessel therein, or the high-pressure discharge lamp may be assembled to a separate reflecting mirror.

<Function of the Present Invention> In the present invention, the surrounding portion of the translucent ceramics discharge vessel of the high-pressure discharge lamp is made almost spherical, and its inner diameter is 6.5 m.
By setting m or more, the acoustic resonance fundamental frequency is lowered and unitized, so if this high-pressure discharge lamp is operated at a high frequency of 100 kHz, the problem of the acoustic resonance phenomenon does not occur. Nevertheless, the required lamp efficiency and life can be obtained, and a high-pressure discharge lamp that can withstand practical use can be obtained. This is because the translucent ceramics discharge vessel used in the present invention has a relatively large inner diameter of its surrounding part, but since ceramics has a higher thermal conductivity than quartz glass, the small-diameter cylindrical part forming the coldest part is used. To increase the amount of heat transfer to the inner diameter of the small-diameter tube
This is because the temperature of the coldest part does not undesirably decrease because the heat capacity of the introduction conductor can be reduced by the following. In addition, when the inner diameter of the small-diameter cylindrical portion is 1 mm or less, the sealing is improved, and it is possible to easily prevent the leading end of the introduction conductor from being undesirably exposed in the small-diameter cylindrical portion. If the lamp is lit at 200 kHz or less, it is easy to take measures against high frequency noise. It should be noted that the high-pressure discharge lamp of the present invention can be lit even at a frequency other than the above unless the acoustic resonance phenomenon is solved by other means or a particular problem is not caused.

Further, if the high-frequency discharge lamp is lit at the above-mentioned lighting frequency, the discharge lamp lighting device also has the following characteristics.
Since the size of the winding component is sufficiently reduced and the semiconductor switching element does not become particularly expensive, the lighting device can be reduced in size, weight, and cost. In addition, the noise level is within a range in which sufficient measures can be taken. In the present invention, the coolest part is formed in the surrounding part of the translucent ceramics discharge vessel by the lamp design, and in the small gap formed around the base end of the electrode in the small-diameter cylindrical part. It may be formed on the inner surface of the staying liquid phase discharge medium. However, when the coolest portion is formed in the surrounding portion, the shadow of the discharge medium that remains in the liquid phase optically affects. Therefore, when it is desired to avoid this, the light is radiated to the outside from the surrounding portion, for example. The temperature of the surrounding portion may be increased by arranging a heat reflecting means for reflecting the heat rays back to the surrounding portion.

A high-pressure discharge lamp according to a second aspect of the present invention is arranged so as to communicate with a substantially spherical surrounding portion having an outer diameter of 7.5 mm or more surrounding the discharge space and an end portion of the surrounding portion.
A light-transmissive ceramic discharge vessel having a small-diameter cylindrical part of 5 mm or less; and a tip that is inserted into the small-diameter cylindrical part while forming a slight gap between the light-transmitting ceramic discharge vessel and the inner surface of the small-diameter cylindrical part. A pair of long electrodes protruding into the surrounding portion of the light-transmitting discharge vessel; a tip connected to the base end of the electrode, at least an intermediate portion sealed with the light-transmitting discharge vessel, and a base end connected to the light-transmitting discharge vessel. An introducing conductor exposed from the outside to the outside;
And a discharge medium enclosed in a translucent ceramics discharge vessel.

In the present invention, the outer diameter of the surrounding portion is measured at the axial center of the surrounding portion, that is, the maximum diameter portion of the surrounding portion in many cases.

According to the present invention, the outer diameter of the surrounding portion is defined in order to reduce the fundamental acoustic resonance frequency of the transparent ceramic discharge vessel as much as possible. In a small high-pressure discharge lamp having a translucent ceramics discharge vessel, for example, a high-pressure discharge lamp having a lamp power of about 10 to 50 W, a translucent ceramics discharge vessel having an inner diameter of the surrounding portion of 6.5 mm or more is formed. The thickness of the surrounding part can be set to 0.5 mm or more. Therefore, in consideration of the wall thickness, in order to make the inner diameter of the surrounding portion 6.5 mm or more, the outer diameter is 7.5.
mm or more. If the thickness is smaller than the above, the production of the translucent ceramics discharge vessel becomes difficult and the mechanical strength becomes too small. Conversely, if the thickness is extremely thicker than the above, the heat capacity of the translucent ceramic becomes too large.

According to a third aspect of the present invention, there is provided the high-pressure discharge lamp according to the first aspect, wherein the surrounding portion of the translucent ceramic discharge vessel has a sphericity of 0.6 or more. .

According to the present invention, the range in which the shape of the surrounding portion of the translucent ceramics discharge vessel is substantially spherical is defined as a range that can be expressed numerically. Hereinafter, the sphericity will be described with reference to FIG.

FIG. 1 is an explanatory view for explaining the sphericity of the surrounding portion of the transparent ceramics discharge vessel in the discharge lamp device of the present invention.

In the figure, 1 is a translucent ceramic container, 1a is an enclosing portion, 1b is a small-diameter cylindrical portion, x is a central axis, and y is an axis perpendicular to the central axis.

The translucent ceramics container 1 is formed by molding translucent ceramics, and has a total length of L.
The surrounding portion 1a is disposed at the center of the translucent ceramic container 1, and has a substantially spherical shape having a given sphericity Rb. The surrounding portion 1a has a maximum inner diameter a and a maximum outer diameter Oa along an axis y perpendicular to the central axis x, and an axial length b along the central axis x. The small-diameter cylindrical portion 1b is
a is formed to protrude integrally from both ends along the central axis x, and a communication hole 1b1 is formed therein along the central axis, and has lengths L1 and L2, respectively. . The inner end of the communication hole 1b1 is surrounded by the surrounding portion 1.
a and the outer end communicates with the outside. The small-diameter cylindrical portion 1b has a small gap, also called a capillary, formed between the electrode and the inner surface of the small-diameter cylindrical portion 1b by inserting the electrode into the small-diameter cylindrical portion, and seals the transparent ceramic discharge vessel. Can be used to stop. The sum L1 + L2 of the lengths of the pair of small-diameter cylindrical portions 1b is a value obtained by subtracting the axial length b of the surrounding portion 1a from the total length L of the translucent ceramics discharge vessel 1.

Thus, the axial length b of the enclosing portion 1a is set between the intersection point P1 of the axis y and the inner surface of the enclosing portion 1a and the inner surface P2 of the rounded portion between the enclosing portion 1a and the small-diameter cylindrical portion 1b. Is the distance between P3 on the left and right, assuming that the point at which the extension of the straight line l intersecting the center axis x intersects P3.

The sphericity Rb, the maximum inner diameter a of the surrounding portion 1a and the axial length b are given by the following equations. That is, in the present invention, it is defined by the following equation that the surrounding portion is substantially spherical. Rb = a / b = 0.6 The value of the sphericity Rb is such that the boundary portion between the surrounding portion 1a and the small-diameter cylindrical portion 1b of the translucent ceramics discharge vessel 1, that is, the inner surface P2 is angular and the small-diameter cylindrical portion 1b If the inner diameter of the through hole 1b1 is small and the surrounding portion 1a is a perfect sphere, it approaches 1. However, the sphericity Rb is, by its definition,
It is influenced by the size of the radius of the inner surface P2 and the size of the inner diameter of the small-diameter cylindrical portion 1b. And, the size of the radius of the inner surface P2 can be affected and changed by the method of manufacturing the translucent ceramics discharge vessel. The inner diameter of the through hole 1b1 of the small-diameter cylindrical portion 1b is influenced by the diameter of the electrode and the gap size of the slight gap depending on the lamp design. further,
Since these methods do not greatly affect the acoustic resonance fundamental frequency, in the present invention, the sphericity Rb is defined as described above in consideration of some design latitude.

In the present invention, when the sphericity Rb is 0.6, the shape of the surrounding portion of the translucent ceramics discharge vessel is generally somewhat similar to a spheroid having a major axis in the axial direction. Although it is somewhat horizontal, it is assumed to be almost spherical.

Further, even if the sphericity RB exceeds 1, there is a substantially spherical range which slightly expands in the y-axis direction rather than the x-axis direction in FIG. For this reason, the sphericity Rb is generally allowed to be about 1.2, preferably 1.1.

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, wherein the lamp power is 10 to 50 W. The present invention specifies a high pressure discharge lamp lighting device which is suitable for an optical fiber light source and the like and can be substituted for a halogen bulb by lamp power because the high pressure discharge lamp is small in size.

It is preferable that this type of small high-pressure discharge lamp be configured with the following specifications. It is preferable that all of the following specifications are satisfied, but one or an arbitrary number of combinations are allowed if necessary. (1) Diameter φs (mm) of introduction conductor and diameter φe of electrode
(Mm); the following expression is satisfied.

0.2 ≦ φe / φs ≦ 0.6 The temperature of the seal of the ceramic sealing compound is reduced to prevent the seal from being corroded by halides, and the temperature of the slight gap is increased to emit light. In order to increase the efficiency, it is only necessary to increase the thermal resistance of the electrode while increasing the thickness of the conducting conductor as much as possible to reduce its thermal resistance. If the diameter ratio φe / φs is less than 0.2, the electrode becomes too thin, and if it exceeds 0.6, the temperature of the seal and the temperature of the slight gap cannot be maintained at required values. (2) Relationship between the internal volume of the translucent ceramic discharge vessel and the linear transmittance; the internal volume is 0.1 cc or less, preferably 0.65
cc or less, preferably 0.25 or less, and the average linear transmittance of the hollow portion is 10% or more, preferably 30% or more.

The linear transmittance is measured at a wavelength of 550 nm. The “average linear transmittance” refers to 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 surrounding portion is 10% or more, the optical efficiency of the combined optical system such as 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 filling the vessel with water and filling the inside with water. Lighten the water and measure. (3) The total length of the translucent ceramics discharge vessel; 35 mm or less. (4) Slight gap; 0.21 mm or more.

In order to obtain a high-pressure discharge lamp having a small lamp power of 50 W or less and a long life and high lamp efficiency, it has been found that it is not appropriate to apply the prior art with a proportional reduction.

Therefore, by setting the small gap as described above, the thermal resistance of the electrode increases, the discharge plasma and the heat transfer from the electrode decrease, and the temperature of the seal decreases. Therefore, it is difficult for the seal to leak.

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 heat radiated by the discharge is reflected back to the transparent ceramic discharge vessel side. It is characterized by having reflecting means.

In order to lower the acoustic resonance fundamental frequency of the translucent ceramic discharge vessel as much as possible, one is to make the inner diameter of the surrounding part relatively large as much as possible. May be formed in the surrounding part. Therefore, in the present invention, a preferable measure in a case where this is not preferable is defined. A specific configuration example of the heat reflecting means will be described below. The first configuration example is as follows. In other words, the heat reflector comprises a visible light-transmitting cylindrical substrate, and a visible light-transmitting and heat-reflecting film formed on at least one of the inner surface and the outer surface thereof. It is supported and arranged around the ceramic discharge vessel by using, for example, a connection conductor to an electrode. In the second configuration example, a visible light transmitting and heat ray reflecting film is formed on the outer surface of the surrounding portion of the light transmitting ceramics discharge vessel.

Thus, in the present invention, since the heat reflecting means for returning the heat radiated by the discharge to the transparent ceramics discharge vessel is provided, the temperature of the surrounding portion rises, and The portion is reliably formed on the inner surface of the discharge medium that stays in the liquid phase in a small gap formed inside the small-diameter cylindrical portion. For this reason, the discharge medium in the liquid phase does not adhere to the surrounding portion, thereby preventing the light distribution from having a shadow.

A high pressure discharge lamp lighting device according to a sixth aspect of the present invention includes a high pressure discharge lamp according to any one of the first to fifth aspects, and current limiting means for lighting the high pressure discharge lamp at a high frequency of 100 to 200 kHz. Lighting circuit means;

The high-pressure discharge lamp lighting device of the present invention specifies a configuration for lighting a small high-pressure discharge lamp having a translucent ceramics discharge vessel while avoiding an acoustic resonance phenomenon. That is, the high-pressure discharge lamp defined in claims 1 to 5 is characterized in that its acoustic resonance fundamental frequency is relatively low, but in the present invention, the frequency is significantly higher than this acoustic resonance fundamental frequency, namely, 100. ~ 200
It is lit at kHz. This frequency range is equivalent to 8 to 10 times the acoustic resonance frequency of the high-pressure discharge lamp, and is a range in which measures against high-frequency noise are easy.

In the present invention, the high-pressure discharge lamp and the lighting circuit means are integrated as in a bulb-type high-pressure discharge lamp, which will be described later. And embodiments spatially separated from each other.

Hereinafter, the configuration of the lighting circuit means that can be employed in implementing the present invention will be described. <About lighting circuit means> (1) Use lighting circuit means whose load characteristics are continuous from the secondary open-circuit voltage to the secondary short-circuit current. Such a load characteristic of the lighting circuit means is a load characteristic represented by a lighting circuit means for a so-called fluorescent lamp. When lighting the high-pressure discharge lamp having the above-described configuration using the lighting circuit means having such load characteristics, blackening at the time of starting hardly occurs, and the lighting circuit means manufactured for the fluorescent lamp is used. Can be diverted. However, it goes without saying that the lighting circuit means designed and manufactured so as to satisfy the above load characteristics for a high pressure discharge lamp can be used.

Thus, according to the above configuration, a small high-pressure discharge lamp lighting device can be obtained by using small lighting circuit means without using an igniter.

(2) In addition, the ratio V ₂₀ / Vs (%) of the secondary open-circuit voltage V ₂₀ of the lighting circuit means can be set in the following range.

110 ≦ V ₂₀ / Vs ≦ 300 Since the discharge starting voltage Vs of the high-pressure discharge lamp varies statistically, it is necessary to pay sufficient attention to its specification.

(3) In addition, the basic circuit configuration of the ballast is
Any type may be used as long as the load characteristics are provided. For example, a circuit configuration mainly including a half-half-bridge type inverter, a full-bridge type inverter, a parallel inverter, a single-type inverter such as a blocking oscillation type inverter may be used.

[0068] (4) In addition the secondary open-circuit voltage _{V 20} to 110% or more of the discharge starting voltage of the high-pressure discharge lamp constitutes 200% or less.

[0069] When the lamp power of the high-pressure discharge lamp is less than 50 W, ballast, its secondary open-circuit voltage _{V 20} 2.5k
Vp-p or less, preferably 2 kVp-p or less, and the secondary short-circuit current I
Preferably, s has a load characteristic of 1.0 A or less.

(5) The lighting circuit means is mainly composed of a high frequency inverter provided with an LC resonance circuit. As an inverter that satisfies this condition, a half-bridge type inverter, a single-type inverter, for example, a blocking oscillation type inverter, a parallel inverter, or the like can be used. The oscillation control of the inverter may be either self-excited or separately excited. The oscillation frequency of the inverter is
It may be constant or variable.

In the case where the operating frequency of the inverter with respect to the resonance frequency of the LC resonance circuit is changed according to the situation, the output voltage of the lighting circuit means can be controlled by changing the operating frequency of the inverter.
That is, if the operating frequency is made closer to the resonance frequency of the LC resonance circuit at the time of starting, the output voltage is increased, and the secondary open-circuit voltage can be made closer to the discharge starting voltage of the high-pressure discharge lamp. Then, if the operating frequency is shifted away from the resonance frequency after the lighting, the output voltage decreases. Therefore,
The load characteristic of the lighting circuit means can be made continuous from the secondary open voltage to the secondary short-circuit current when the secondary open voltage is close to the discharge starting voltage of the high pressure discharge lamp.

In the case where the operating frequency is constant, L
By configuring the resonance frequency of the C resonance circuit to change according to the situation, the output voltage of the lighting circuit means can be controlled. That is, when no load is applied, the inductor L of the LC resonance circuit saturates and its inductance decreases, and the resonance frequency increases to approach the operating frequency, so that the output voltage of the lighting circuit means increases. Further, at the time of load, the saturation of the inductor at the LC resonance time disappears according to the lamp current, the resonance frequency moves away from the operating frequency, and the output voltage decreases accordingly.

Thus, the circuit configuration of the lighting circuit means is simplified, and a more compact and inexpensive high-pressure discharge lamp lighting device can be obtained. Further, since the lighting circuit means includes the LC resonance circuit, the waveform of the output voltage can be a sine wave.

<Other Configurations> (1) The glow-arc transition time of the high-pressure discharge lamp is set to 0.
It is configured to be in the range of 5 to 3.0 seconds, preferably in the range of 1.0 to 2.5 seconds. The glow-arc transition time is
By appropriately setting the specifications of the high-pressure discharge lamp and / or the matching with the lighting circuit means, the configuration can be made to fall within the above range. The glow-arc transition time is determined by measuring the descent point of the lamp voltage waveform using an oscilloscope and calculating the average value of five measurements. Note that the falling point of the ramp voltage waveform must be the falling point when both electrodes undergo glow-arc transition. Therefore, when not only a pair of electrodes undergo glow-arc transition simultaneously, but also there is a time lag,
This is the descent point for the later glow-arc transition electrode. If the glow-arc transition time is less than 0.5 seconds,
A large amount of glow-arc transition power is applied in a short period of time, resulting in excessive heating of the electrodes, which leads to excessive evaporation of the electrodes, which promotes blackening and lowers the luminous flux retention rate. Too much. The glow-arc transition time is 3.0
If the time exceeds seconds, the glow-arc transition time becomes long, so that the sputtering of the electrode becomes remarkable, the blackening of blackening at the time of starting is promoted, and the luminous flux maintenance ratio is reduced.

Then, the glow-arc transition time is set to 0.
If it is within the range of 5 to 3.0 seconds, it is 8 in 3000 hours of lighting.
A luminous flux maintenance ratio of 0% or more can be secured. The lighting time refers to the time during which the high-pressure discharge lamp was turned on for 165 minutes and then turned off for 15 minutes. Further, if the glow-arc transition time is within 3 seconds, it can be said that the glow-arc transition time is within an allowable range that does not give a particular unnatural feeling for normal lighting purposes.

According to a seventh aspect of the present invention, there is provided a lighting device, comprising: a lighting device main body; and a high pressure discharge lamp lighting device according to the sixth aspect supported by the lighting device main body.

In the present invention, the term “illumination device” is a broad concept including any device that uses light emitted from 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-shaped high-pressure discharge lamp" is a type of incandescent lamp that integrates a high-pressure discharge lamp and its ballast, has a base for power reception, and is mounted in a lamp socket that is compatible with the base. Means a lighting device configured to be used as if it were turned on.
In the case of configuring a bulb-type high-pressure discharge lamp, a reflector for condensing light emitted from the high-pressure discharge lamp so as to obtain desired light distribution characteristics can be provided. Furthermore, a light diffusing glove or cover can be provided to reduce the high brightness of the high pressure discharge lamp. Furthermore, a die having a desired specification can be used. Therefore, if the purpose is to replace conventional light source lamps,
The same base as that of a conventional light source lamp may be used.

Further, when the lighting device is a lighting device, the lighting device may have a configuration in which a lighting circuit is provided and a high-pressure discharge lamp is mounted, or a light bulb-shaped high-pressure discharge lamp is mounted without the lighting circuit. The configuration may be as follows. In the case of a lighting fixture provided with lighting circuit means, the lighting circuit means may be provided in the lighting equipment, or may be provided at a position separated from the lighting equipment, for example, behind a ceiling.

[0079]

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

FIG. 2 is a partially sectional front view showing a part of the outer tube in the first embodiment of the high-pressure discharge lamp of the present invention.

FIG. 3 is a partially sectional front view showing a part of the outer tube and the arc tube.

FIG. 4 is an enlarged sectional view showing the arc tube.

In each figure, the high-pressure discharge lamp comprises an arc tube IB, a first connection conductor CC1, a metal coil CO, an outer tube OB, a getter GT, and a base B.

<Regarding the arc tube IB> The arc tube IB is composed of a translucent ceramic discharge vessel 1, first and second electrodes 2.
A, 2B, an introduction conductor 3, a seal 4, and a staying discharge medium 5 are provided, and have a vertically symmetric structure.

The translucent ceramics discharge vessel 1 has an enclosing portion 1a and a pair of diameter cylindrical portions 1b and 1b. The surrounding portion 1a has a substantially spherical shape. Small diameter cylinder 1b
Are connected by a curved surface continuous with the surrounding portion 1a 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 introduction conductor 3 is made of niobium and has a rod-like shape, and its distal end is discharge-welded to the base ends of the electrodes 2A and 2B, and its base end protrudes outside the translucent ceramics discharge vessel 1.

The seal 4 is formed by melting and solidifying the ceramic sealing compound so as to be interposed between the small-diameter cylindrical portion 1b and the sealing portion 2a of the light-transmitting ceramic discharge vessel 1 and to form the light-transmitting ceramic. The discharge vessel 1 is hermetically sealed, and is covered so that the introduction conductor 3 is not exposed inside the translucent ceramic discharge vessel 1. Also,
By this sealing, the electrodes 2A and 2B are fixed at predetermined positions. In order to form the seal 4, the translucent ceramics discharge vessel 1 is set in a vertical position and the ceramic sealing compound is placed on the end face of the small-diameter cylindrical portion 1b.
Is applied around the part protruding outside, and is heated and melted to enter the gap between the introduction conductor 3 and the inner surface of the communication hole 1b1, and the entirety of the introduction conductor 3 inserted into the small-diameter cylindrical portion 1b is removed. Along with the coating, the base end of the electrode 2 is further coated and solidified by cooling.

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. In addition, since the metal halide and mercury are sealed more than the amount that evaporates, a part 5 of the metal halide and the mercury remain in a small gap g in a liquid state during stable lighting. The interface of the discharge medium 5 forms the coldest part.

<Regarding the First Connection Conductor CC1> The connection conductor CC1 is made of a molybdenum wire and the tip is
It is connected to the power supply conductor 3 on the A side, and the middle extends substantially parallel to and away from the axial direction of the translucent ceramics discharge vessel 1.

<Regarding the Metal Coil CO> The metal coil CO is wound around the outer periphery of the small-diameter cylindrical portion 1b through which the second electrode 2B is inserted, and the coil on the power supply conductor 3 side. The terminal ends extend in the axial direction of the translucent ceramics discharge vessel 1 and are connected to the first connection conductor CC1. Outer tube OB is <about outer tube OB>, consists T-shaped valve made of hard glass, the pinch seal portions ps to proximal end, distal to the exhaust tip-off portion t is formed respectively, inside is evacuated 10 ^- It is in a low vacuum state of about ⁴ torr. 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 obtained by exhausting the inside of the outer tube OB after sealing the outer tube OB and completely closing the exhaust tube (not shown). Although not shown, the first connection conductor CC1
And the second connection conductor connected to the lower introduction conductor 3 in the drawing are hermetically derived from the pinch seal portion ps to form an external connection terminal. <Regarding Getter GT> The getter GT is made of a ZrAl alloy, and is supported on the first connection conductor CC1 by welding. <Regarding Base B> The base b is made of an E11 type screw base, connects a pair of external connection terminals (not shown) as required, and an inorganic adhesive (not shown) to the pinch seal portion ps of the outer tube OB. Has been fixed by.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The high-pressure discharge lamp shown in FIGS. 2 to 4 has the following specifications.

<Emitting tube> Translucent ceramics discharge vessel: made of translucent alumina ceramics, having a total length of 25 mm, an outer diameter of the surrounding portion 1a of 9 mm,
Inner diameter 8 mm (wall thickness 0.5 mm), sphericity is 0.65, small-diameter cylindrical part 1b has outer diameter 1.7 mm, inner diameter 0.7 mm (wall thickness 0.5 mm) Electrode: shaft part and coil part have diameter 0 .25 mm tungsten Introduced conductor: niobium, diameter 0.64 mm Slight gap g: 0.225 mm Discharge medium: Ne 3% as starting gas and buffer gas
+ Ar is 200 torr, and an appropriate amount of mercury and iodides of Na, Tl, and Dy as luminescent metals (all of the luminescent metal halides do not evaporate during lighting, and the surplus remains in a small gap. The first and second metal coils are formed by winding a 0.3 mm diameter molybdenum wire at a winding pitch of 200% for 7 turns and closely contacting the outer periphery of the small diameter cylindrical portion from a position adjacent to the surrounding portion. It is wound.

Next, the lamp specifications of the above embodiment will be described. Outer tube diameter: 11 mm, total length: 70 mm, light center distance: 49
mm Base: E11 Lamp power: 20 W Total luminous flux: 1800 lm Efficiency: 90 lm / W Color temperature: any of 3000 K, 3500 K and 4200 K Rated life: 8000 h FIG. 5 shows an embodiment of the high pressure discharge lamp lighting device of the present invention. FIG. 3 is a circuit diagram showing lighting circuit means in FIG.

The figure shows a high-pressure discharge lamp lighting device using lighting circuit means for a fluorescent lamp mainly comprising a half-bridge type high-frequency inverter. In the figure, AS is an AC power supply, f is an overcurrent fuse, NF is a noise filter, RD is a rectified DC power supply, HFI is a high-frequency inverter, and LC is a load circuit. Hereinafter, each component will be described.

The AC power supply AS is a commercial 100 V power supply.

The overcurrent fuse f is a pattern fuse integrally formed on the wiring board, and protects the circuit from being burned out when an overcurrent flows and burnt out.

The noise filter NF includes an inductor L1 and a capacitor C1, and removes a high frequency generated by the operation of the high frequency inverter so as not to flow to the power supply side.

The rectified DC power supply RD comprises a bridge-type rectifier circuit BR and a smoothing capacitor C2. The AC input terminal of the bridge-type rectified color BR is connected to an AC power supply A via a noise filter NF and an overcurrent fuse f. And the DC output terminal is connected to both ends of the smoothing capacitor C2,
Supply smoothed DC.

The high-frequency inverter HFI is composed of a half-bridge type inverter, and includes first and second switching means Q1, Q2, a gate drive circuit GD, a starting circuit ST, and a gate protection circuit GP.

The first switching means Q1 is composed of an N-channel MOSFET, and its drain is connected to the positive side of the smoothing capacitor C2. The second switching means Q2 is composed of a P-channel MOSFET, and its source is connected to the source of the first switching means Q1, and its drain is connected to the minus side of the smoothing capacitor C2. Therefore, the first and second switching means Q1, Q2 are connected in series in the forward direction, and both ends are connected between the output terminals of the rectified DC power supply RD.

The gate drive circuit GD includes a feedback circuit FB
C, series resonance circuit SOC and gate voltage output circuit GO
Consists of The feedback means FBC is composed of an auxiliary winding magnetically coupled to a current limiting inductor L2 described later. The series resonance circuit SOC includes a series circuit of an inductor L3 and a capacitor C3, and both ends are connected to feedback means FBC. The gate voltage output means GO is connected to the series resonance circuit SOC.
The resonance voltage appearing at both ends of the capacitor C3 is taken out via the capacitor C4. And
One end of the capacitor C4 is connected to a connection point between the capacitor C3 and the inductor L3, and the other end of the capacitor C4 is connected to the first
And the respective gates of the second switching means Q1 and Q2. Further, the other end of the capacitor C3 is connected to the sources of the first and second switching means Q1, Q2. As a result, the resonance voltage appearing at both ends of the capacitor C3 is applied to the gates of the first and second switching means Q1, Q2 via the gate voltage output circuit GO.
Applied between sources.

The starting circuit ST includes resistors R1, R2, R3
Consists of One end of the resistor R2 has a smoothing capacitor C.
2 and the other end is connected to the gate of the first switching means Q1. One end of the resistor R2 and the output terminal on the gate side of the gate voltage output circuit GO of the gate drive circuit GD, that is, the capacitor. It is connected to the other end of C4. The other end of the resistor R2 is connected to a series resonance circuit S
It is connected to the connection point between the inductor L3 of the OC and the feedback circuit FBC. The resistor R3 has one end connected to the connection point of the first and second switching means Q1, Q2, that is, the source and the source side of the gate voltage output circuit GO, and the other end connected to the negative side of the smoothing capacitor C2. are doing.

The gate protection circuit GP has a pair of zener diodes connected in anti-series, and a gate voltage output circuit G
O is connected in parallel.

The load circuit LC comprises a high-pressure discharge lamp HPL,
It comprises a series circuit of a current limiting inductor L2 and a DC cut capacitor C5, and a resonance capacitor C6 connected in parallel to the high-pressure discharge lamp HPL. One end is connected to the connection point of the first and second switching means Q1, Q2, and the other end is connected. It is connected to the drain of the second switching means Q2. The high-pressure discharge lamp HPL has the configuration shown in FIGS. The current limiting inductor L2 and the resonance capacitor C6 form a series resonance circuit. The DC cut capacitor C
5 has a large capacitance and does not significantly affect series resonance.

A capacitor C7 connected between the drain and source of Q2 reduces the load during switching of the second switching means Q2.

Next, the circuit operation will be described.

When the AC power supply AS is turned on, the DC voltage smoothed by the rectified DC power supply RD is applied to the smoothing capacitor C
Appears at both ends of 2. Then, a DC voltage is applied between both drains of the first and second switching means Q1 and Q2 connected in series. However, both switching means Q
1, Q2 is off because no gate voltage is applied.

Since the DC voltage is also applied to the starting circuit ST at the same time, a voltage appears at both ends of the resistor R2 mainly in accordance with a proportional ratio of the resistance values of the resistors R1, R2 and R3. The terminal voltage of the resistor R2 is the first and second terminals.
Is applied as a positive voltage between the gate and source of the switching means Q1 and Q2.

As a result, the first switching means Q1
Is turned on because it is set to exceed the threshold voltage. On the other hand, the voltage applied between the gate and the source of the second switching means Q2 has the opposite polarity to the required gate voltage, and thus remains off.

When the first switching means Q1 is turned on, the first switching means Q is switched from the rectified DC power supply RD.
1 flows through the load circuit LC. As a result, the series resonance circuit of the current limiting inductor L2 and the resonance capacitor C6 resonates, a high resonance voltage appears between the terminals of the resonance capacitor C6, and is applied to the high-pressure discharge lamp HPL.

On the other hand, when a current flows through the current limiting inductor L2, a voltage is induced in the feedback circuit FBC which is magnetically coupled. As a result, the series resonance circuit SOC resonates in series, and a boosted negative voltage is generated in the capacitor C3. Therefore, the negative voltage is clipped to a constant voltage by the gate protection circuit GP, and the first and second voltages are passed through the gate voltage output circuit GO. Is applied between the gate and source of the switching means Q1 and Q2.

As a result, the second switching means Q2
Turns on because it exceeds the threshold voltage.

On the other hand, the first switching means Q1 which has been on until now turns off since the gate voltage has the opposite polarity.

When the second switching means Q2 is turned on, the electromagnetic energy accumulated in the current limiting inductor L2 of the load circuit LC and the charge of the capacitor C6 are released, and the second switching means Q2 is discharged from the current limiting inductor L2. A current flows in the load circuit LC in the opposite direction through the capacitor C6, and a high voltage due to resonance having inverted polarity appears at both ends of the capacitor C6, and is applied to the high-pressure discharge lamp HPL. Thereafter, the operation described above is repeated. High frequency inverter H
The operating frequency of the FI was 150 kHz, and the high-pressure discharge lamp HPL started well without any acoustic resonance phenomenon and lit.

FIG. 6 is a graph showing the relationship between the inner diameter of the surrounding portion of the high pressure discharge lamp, the acoustic resonance fundamental frequency, and the lighting frequency in one embodiment of the high pressure discharge lamp lighting device of the present invention.

In the figure, the horizontal axis is the inner diameter (mm) of the surrounding part.
The vertical axis represents the acoustic resonance fundamental frequency and the lighting frequency (k
Hz) are shown on a logarithmic scale. Each line has the following meaning. Curve A: Acoustic fundamental frequency of high-pressure discharge lamp Straight line B: Lowest operating frequency that does not cause acoustic resonance phenomenon Vertical line C: Boundary line indicating the range of the present invention with respect to the inner diameter of the surrounding part Horizontal line D: Operating frequency with the present invention Horizontal line E: Boundary line indicating the upper limit of the preferred lighting frequency Horizontal line F: Border line indicating the lower limit of the lighting frequency of the present invention Horizontal line G: Boundary line indicating the lower limit of the preferred lighting frequency Thus, the acoustic resonance fundamental frequency (curve A) of a high pressure discharge lamp is approximately inversely proportional to the inner diameter of the enclosure when the enclosure is substantially spherical. The lowest operating frequency (straight line B) at which the high-pressure discharge lamp does not cause an acoustic resonance phenomenon is also substantially proportional to the inner diameter of the surrounding portion. A small high-pressure discharge lamp having a translucent ceramic discharge vessel as shown in FIGS. 2 to 4 does not cause an acoustic resonance phenomenon, is practical in lamp efficiency and life, and easily eliminates problems of high frequency noise. To avoid it,
It can be understood that the lighting should be performed in the range of 200 kHz (between the straight line C and the straight line F). The frequency is preferably in the range of 120 to 180 kHz.

FIG. 7 is a longitudinal sectional view showing a translucent ceramic discharge vessel in a second embodiment of the high-pressure discharge lamp of the present invention.

In the figure, the same parts as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, the outer diameter of the translucent ceramics discharge vessel 1 has a shape closer to an ellipsoid rather than a true sphere, but the shape of the inner surface is defined by an inscribed circle having a diameter R. Therefore, the acoustic resonance frequency is in a simple mode.

FIG. 8 is a partially sectional front view showing a part of the outer tube and the arc tube in the third embodiment of the high-pressure discharge lamp of the present invention. In each figure, the same parts as those in FIG. The present embodiment is different in that a base is not attached to the outer tube OB and a base is not provided. That is, the first and second connection conductors CC are connected to the introduction conductors 3, 3 projecting from both ends of the arc tube IB.
1, one end of CC2, and these connecting conductors CC1,
After the arc tube IB is supported by the CC2 and inserted into the outer tube OB, the open end of the outer tube OB is heated and softened in a reduced-pressure atmosphere, and pinch-sealed with a mold to form a pinch seal portion p.
s. Then, a structure is provided in which the other ends of the connection conductors CC1 and CC2 are air-tightly led out from the pinch seal portion ps to form a pair of external connection terminals OCT1 and OCT2.

FIG. 9 is a partially sectional front view showing a part of an outer tube in a fourth embodiment of the high-pressure discharge lamp of the present invention.

In the figure, the same parts as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted. In the present embodiment, the heat ray radiated from the arc tube IB is provided outside the arc tube IB.
A difference is that a heat reflector HR for returning the inside of B to maintain the temperature of the arc tube IB as high as necessary is provided. That is, the heat reflector HR includes the ring-shaped base GR and the heat reflection film HF. The ring-shaped substrate GR is made of a transparent glass ring, and has a visible light transmitting property and a heat reflecting property. And
The connection conductor CC1 is fixed and supported by support means (not shown). The heat reflection film HF is made of, for example, SiO ₂ and A
It is formed of an infrared reflective film composed of a multilayer film with l ₂ O ₃ or a transparent conductive film containing tin oxide as a main component, and is formed on the inner surface of the ring-shaped substrate GR.

FIG. 10 shows a fifth embodiment of the high-pressure discharge lamp according to the present invention.
FIG. 4 is a partial cross-sectional front view showing a part of an outer tube in the embodiment of FIG.

In the figure, the same portions as those in FIG. 8 are denoted by the same reference numerals, and description thereof will be omitted. In the present embodiment, a heat reflector HR for returning the heat ray radiated from the arc tube IB to the inside of the arc tube IB to maintain the temperature of the arc tube IB as high as necessary is arranged on the outer surface of the arc tube IB. Different in that. That is, the heat reflector HR is formed using the surrounding portion 1a of the translucent ceramics discharge vessel 1 as a base. Therefore, the heat reflecting film HF is formed directly on the outer surface of the surrounding portion 1a.

FIG. 11 is a partial center sectional side view showing a spotlight as a lighting device according to a first embodiment 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 current collector 11a. Body case 11c
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 move up and down in a vertical plane. In addition,
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. Reflector 1
1e is disposed in the main body case 11c at a position 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 the drawings, and the same parts as those in the drawings are denoted by the same reference numerals and description thereof will be omitted. The high-pressure discharge lamp 12 is attached to the spotlight main body 11 by attaching the base B to the lamp socket 11d. Further, the light-shielding tube 11f shields light from the distal end of the outer tube OB while the high-pressure discharge lamp 12 is attached, thereby preventing glare. FIG. 12 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.

In each of the figures, the 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.

[High Pressure Discharge Lamp 12] The high pressure discharge lamp 12 has the same specifications as shown in FIG. 8, and external connection terminals OCT1 and OCT2 project upward from the pinch seal portion ps of the outer tube OB in the figure. . The same parts as those in FIG. 8 are denoted by the same reference numerals, and description thereof will be omitted.

[Pedestal 13] The pedestal 13 is formed by molding a heat-resistant synthetic resin, and has a mounting hole 13a at the center thereof.
In the figure, a mounting portion 13b is provided on an upper outer peripheral edge, and a hollow cup-shaped skirt portion 13c is provided on a lower 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. The skirt portion 13c surrounds and protects the periphery of the reflecting mirror 14, and has an external appearance.

[Reflection Mirror 14] The reflection mirror 14 is disposed around the high-pressure discharge lamp 12, and at least the light-emitting portion, that is,
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. The front surface 14b
It is manufactured by molding a transparent glass, and is hermetically sealed to the reflecting mirror 14 with a low melting point 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 lower surface of the wiring board 15a. It is connected to the wiring board 15a as required. The lighting circuit means 15 has the same circuit configuration as that of FIG.

[Regarding the Substrate 16] The substrate 16 has a cup shape, and a base 17 to be described later is attached to 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 13c 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.

[Regarding 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 each of the first to fourth aspects of the present invention, the translucent ceramic has a substantially spherical inner surface of the surrounding portion, an inner diameter of 6.5 mm or more, and an inner diameter of the small-diameter cylindrical portion of 1 mm or less. A discharge vessel, a long electrode with a small gap formed around the inside of the small-diameter cylindrical part, and a long electrode whose front end faces the surrounding part, and a discharge medium sealed in the translucent ceramics discharge vessel. By providing the same, the fundamental frequency of acoustic resonance is low and unified, so that
When operated at a frequency of 00 kHz or higher, an acoustic resonance phenomenon does not occur, and a high-pressure discharge lamp having a required lamp efficiency can be provided.

According to the second aspect of the present invention, there is provided a transparent ceramic discharge in which the inner surface of the surrounding portion is substantially spherical, the outer diameter is not less than 7.5 mm, and the outer diameter of the small-diameter cylindrical portion is not more than 2.5 mm. It has a container, a long electrode that is inserted through a small-diameter cylindrical portion with a slight gap formed around it, and has a tip facing the surrounding portion, and a discharge medium sealed in a translucent ceramics discharge container. As a result, the fundamental frequency of acoustic resonance is low and unified, so that 100 kHz
When lit at a frequency equal to or higher than z, an acoustic resonance phenomenon does not occur, and a high-pressure discharge lamp having a required lamp efficiency can be provided.

According to the third aspect of the present invention, since the inner surface of the enclosing portion of the translucent ceramics discharge vessel has a sphericity of 0.6 or more, the inner surface of the enclosing portion is substantially spherical. A discharge lamp can be provided.

According to the fourth aspect of the present invention, in addition, since the lamp power is 10 to 50 W, it is possible to provide a compact, high-pressure discharge lamp that can be replaced with a halogen bulb.

According to the fifth aspect of the present invention, since the heat reflecting means for reflecting the heat radiated by the discharge back to the transparent ceramics discharge vessel is provided, the heat reflecting means is provided between the small-diameter cylindrical portion and the electrode. It is possible to provide a high-pressure discharge lamp in which the coldest part is formed on the inner surface of the discharge medium that stays in a liquid state in the formed slight gap.

According to the invention of claim 6, the frequency of 100 to
By providing the lighting circuit means for lighting the high-pressure discharge lamp at a high frequency of 200 kHz, it is possible to provide a high-pressure discharge lamp lighting device which does not cause an acoustic resonance phenomenon and can easily take measures against high-frequency noise.

According to the invention of claim 7, it is possible to provide a lighting device having the effects of claims 1 to 5.

[Brief description of the drawings]

FIG. 1 is an explanatory view for explaining the sphericity of the surrounding portion of a translucent ceramics discharge vessel in a discharge lamp device of the present invention.

FIG. 2 is a partially sectional front view showing a part of an outer tube in the first embodiment of the high-pressure discharge lamp of the present invention;

FIG. 3 is a partial cross-sectional front view showing a part of the outer tube and a part of the arc tube;

FIG. 4 is an enlarged sectional view showing the arc tube.

FIG. 5 is a circuit diagram showing lighting circuit means in one embodiment of the high pressure discharge lamp lighting device of the present invention.

FIG. 6 is a graph showing the relationship between the inner diameter of the surrounding portion of the high pressure discharge lamp, the acoustic resonance fundamental frequency, and the lighting frequency in one embodiment of the high pressure discharge lamp lighting device of the present invention.

FIG. 7 is a longitudinal sectional view showing a translucent ceramics discharge vessel in a second embodiment of the high-pressure discharge lamp of the present invention.

FIG. 8 is a partial cross-sectional front view showing a part of an outer tube and a part of an arc tube in a third embodiment of the high-pressure discharge lamp of the present invention.

FIG. 9 is a partial sectional front view showing a part of an outer tube in a fourth embodiment of the high-pressure discharge lamp of the present invention;

FIG. 10 is a partial cross-sectional front view showing a part of an outer tube in a fifth embodiment of the high-pressure discharge lamp of the present invention.

FIG. 11 is a partial center cross-sectional side view showing a spotlight as a first embodiment of a lighting device.

FIG. 12 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: electrode 2B: electrode 3: introduction conductor 4: seal CC1: first connection conductor CO: metal coil OB: outer tube ps: Pinch seal part t: Exhaust tip off part GT: Getter B: Base

Claims (7)

[Claims] 1. A light-transmitting device comprising: a surrounding portion having an inner diameter of 6.5 mm or more surrounding a discharge space and having a substantially spherical inner surface communicating with an end of the surrounding portion, and a small-diameter cylindrical portion having an inner diameter of 1 mm or less. A small gap is formed between the transparent ceramic discharge vessel and the inner surface of the small-diameter cylindrical portion of the translucent ceramic discharge vessel, and the distal end faces the surrounding portion of the translucent discharge vessel while being inserted into the small-diameter cylindrical portion. A pair of long electrodes; a leading end connected to the base end of the electrode, at least an intermediate portion sealed in the translucent discharge vessel and a base end exposed to the outside from the translucent discharge vessel; A high-pressure discharge lamp, comprising: a discharge medium sealed in a conductive ceramic discharge vessel. 2. A substantially spherical surrounding portion having an outer diameter of 7.5 mm or more surrounding a discharge space, and a small-diameter cylindrical portion having an outer diameter of 2.5 mm or less disposed in communication with an end of the surrounding portion. The light-transmitting ceramic discharge vessel is inserted into the small-diameter cylindrical portion while forming a small gap between the inner surface of the small-diameter cylindrical portion of the light-transmitting ceramic discharge container and the distal end of the light-transmitting ceramic discharge container. A pair of long electrodes protruding from the electrode; an introduction conductor having a distal end connected to the base end of the electrode, at least an intermediate portion sealed in the translucent discharge vessel, and a base end exposed to the outside from the translucent discharge vessel; A high-pressure discharge lamp comprising: a discharge medium sealed in a translucent ceramic discharge vessel. 3. The transparent ceramic discharge vessel according to claim 1, wherein the surrounding portion has a sphericity of 0.6 or more.
A high pressure discharge lamp as described. 4. The high-pressure discharge lamp according to claim 1, wherein the lamp power is 10 to 50 W. 5. A high-pressure high-pressure apparatus according to claim 1, further comprising a heat reflecting means for reflecting the heat radiated by the discharge back to the inside of the transparent ceramics discharge vessel. Discharge lamp. 6. A high-pressure discharge lamp according to claim 1, wherein said high-pressure discharge lamp is operated at an operating frequency of 100 to 2.
A lighting circuit means having current limiting means for lighting at a high frequency of 00 kHz. 7. A lighting device comprising: a lighting device main body; and the high pressure discharge lamp lighting device according to claim 6 supported by the lighting device main body.