JP2001345076A - High-pressure discharge lamp, lighting device and illumination device of high pressure discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high pressure discharge lamp which has low manufacturing dispersions and which shows a sufficiently low starting voltage, and provide a lighting device and an illumination device of the high-pressure discharge lamp using this. SOLUTION: A translucent ceramics discharge container having an enclosure part and a pair of small diameter pipe parts which are communicating into both ends of the enclosure part, a light emitting tube having a pair of electrodes and a discharge medium, a metallic electro-conductive film which is installed at least at an outer periphery of one side of the small diameter pipe parts of the translucent ceramics discharge container and which is connected at one end so that it has the same electric potential as that of the electrode of the other side, an outer tube to airtightly house these, and a pair of outside connection terminals which are connected with the light emitting tube and which are airtightly drawn out from the outer tube to the outside are equipped.

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, as a light source for an optical fiber or an alternative light source for a halogen bulb, a small metal halide lamp having a lamp power of about 10 to 30 W and a small lighting circuit having a small base and a small lighting circuit means integrated with the base have been attached. A high-pressure discharge lamp device, ie a bulb-shaped high-pressure discharge lamp, has been developed by the present inventors. Since the bulb-type high-pressure discharge lamp has a lamp efficiency of about 3 to 4 times as compared with the halogen bulb and is significantly smaller than the bulb-type fluorescent lamp,
Can be treated as a point light source.

However, since the discharge lamp is a high-pressure discharge lamp, a ballast incorporating an igniter for generating a relatively high pulse voltage at the time of starting, that is, a lighting circuit means or a lighting circuit means not incorporating an igniter, and an igniter provided separately therefrom Must be used. Under such circumstances, 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 fixture will eventually become large as a system.

The inventors of the present invention have conducted research to avoid this problem, and as a result, as a lighting circuit means for a small high-pressure discharge lamp, a small high-frequency inverter used in a compact fluorescent lamp has been mainly used. We have succeeded in using lighting circuit means. Such a lighting circuit means generally has a simple circuit configuration and operates at a high frequency.
Since it is lightweight and inexpensive in addition to being compact, it is possible to reduce the size, weight, and cost of the high pressure discharge lamp lighting device.

[0005] However, if the starting voltage of the high-pressure discharge lamp can be further reduced, it is possible to further reduce the size of the lighting circuit means, and further reduce the weight and cost.

[0006]

Generally, the starting voltage of a discharge lamp follows a function of the distance between the electrodes and the pressure of the discharge medium, that is, Paschen's law when the conditions of the electrodes and the discharge medium are constant.

Therefore, in order to lower the starting voltage, it is common to lower the pressure of the discharge medium and shorten the distance between the electrodes. This certainly lowers the starting voltage, but increases the sputtering and evaporation of the tungsten constituting the electrode, blackens the translucent ceramic discharge vessel, lowers the luminous flux maintenance rate, and lowers the luminous efficiency. And other problems.

On the other hand, a proximity conductor may be provided as one of the means for lowering the starting voltage. As a conventional technique of this kind, one end of one conducting wire is formed in each of a pair of small-diameter cylindrical portions provided in a translucent ceramic discharge vessel at a position close to a boundary with an enclosing portion, for two to three turns. A configuration is known in which an intermediate portion of the conductive wire extends close to the surrounding portion. Note that this conductive wire is not conductively connected to the electrode, and is in a floating state.

As another prior art, one of a pair of elongated rod-shaped sealing portions provided in a light-transmitting quartz discharge vessel is provided with one end of a conductive wire at an intermediate portion in the longitudinal direction thereof, and has two or three ends.
Turn, and make the middle part along the surrounding part at intervals,
This is a structure in which the other end is connected to an external introduction line on the other sealing portion side.

However, it has been found that none of the above-mentioned prior arts provided with a coil-shaped proximity conductor is necessarily effective. The reasons are as follows: (1) Since the cross section of a coil is usually circular, it is only in line contact with the arc tube. (2) If it is coil-shaped, the pitch between the coils tends to vary, and if the pitch is not managed, the starting voltage will vary. It is possible.

An object of the present invention is to provide a high-pressure discharge lamp exhibiting a low starting voltage and having a small variation in starting voltage, a high-pressure discharge lamp lighting device and a lighting device using the same.

[0012]

A high-pressure discharge lamp according to a first aspect of the present invention comprises an enclosing portion surrounding a discharge space, and a pair of small-diameter cylindrical portions arranged in communication with both ends of the enclosing portion and having an inner diameter smaller than the enclosing portion. A translucent ceramic discharge vessel, a pair of elongate electrodes inserted into the small-diameter cylindrical portion while forming a small gap with the inner surface of the small-diameter cylindrical portion of the translucent ceramic discharge container, and a translucent ceramic discharge An arc tube having a discharge medium sealed in a container; and a luminous tube provided on an outer periphery of a small-diameter cylindrical portion through which at least one electrode is inserted, and connected to be at the same potential as the other electrode. A metal conductive film; an outer tube in which the arc tube and the metal conductive film are housed in an airtight manner; and a pair of external connection terminals connected to the first and second electrodes and hermetically drawn out of the outer tube to the outside; Has It is characterized by a door

In the present invention and each of the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified. Hereinafter, the arc tube will be described for each component.

[About the arc tube]

The arc tube has at least a translucent ceramic discharge vessel, a pair of electrodes and a discharge medium.

<Transparent ceramic discharge vessel>

The term "light-transmitting" refers to a light-transmitting property 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.
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 ceramic 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 a polycrystalline non-oxide such as aluminum nitride (AlN).

In order to manufacture a light-transmitting ceramic discharge vessel, a central surrounding portion and a small-diameter cylindrical portion at both ends or one end 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 members connected to both ends of the spherical portion to form the small-diameter cylindrical portion are separately pre-sintered and then joined as required, and By sintering, 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 and closed at both end surfaces of the cylinder, and a small-diameter tubular body that is fitted into a center hole of the end plate to form a small-diameter tubular portion, An integral discharge vessel can also be formed by separately sintering and fitting each other as required and sintering the whole.

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 ceramics discharge vessel has a total length of 35 mm or less, preferably 10 to 30 mm.
mm.

<About a pair of electrodes>

The pair of electrodes are sealed in a translucent ceramic discharge vessel, and use tungsten or doped tungsten as a material. The electrode is inserted into the small-diameter cylindrical portion of the translucent ceramics discharge vessel, and the tip is located in the surrounding portion, or the tip is also located in the small-diameter tubular portion, but is located at a position where the surrounding portion is desired. May be disposed so as to form a discharge in the surrounding portion.

Further, the electrode forms a slight gap called a capillary between the electrode and the inner surface of the small-diameter cylindrical portion in a state of being inserted into the elongated small-diameter cylindrical portion. In this case, it is desirable that the intermediate portion of the electrode has a constant thickness in order to form as small a gap as possible as uniform as possible with the inner surface of the small-diameter cylindrical portion of the translucent ceramics discharge vessel.

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

Furthermore, the base end of the electrode is fixed to a required position with respect to the translucent ceramic discharge vessel, and functions to introduce a current from the outside.

Furthermore, the base end of the electrode can be electrically and mechanically supported by being fixed to the front end of the power supply conductor by welding or the like. In this case, if necessary, the power supply conductor
It is permissible to attach a member such as molybdenum, cermet, or the like interposed between the base end of the electrode and the base end of the electrode as a refractory part when the base end of the electrode is fixed.

<About the 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, for example, a metal halide or amalgam.

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

On the other hand, the rare gas is not essentially limited to a specific gas. However, it is necessary to reduce the glow current at the time of transition from the normal glow discharge to the abnormal glow discharge or to reduce the discharge starting voltage. At times, neon and argon can be mixed and encapsulated. In this case,
Argon can be mixed with neon in a partial pressure range of 0.1 to 15%, preferably up to 10%. Also, neon and argon are generally 80 to 500 t
orr, preferably at a fill pressure of 100 to 200 torr. If the filling pressure is less than 80 torr, the glow-arc transition time becomes long, and blackening due to sputtering or evaporation of tungsten of the electrode material increases. On the other hand, when the filling pressure exceeds 500 torr, 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 filled 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 any one of iodine, bromine, chlorine or fluorine, or A plurality of types 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, lithium L
One or a plurality of halides selected from the group consisting of i, scandium Sc, and a rare earth metal can be used.

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.

The lamp power of the high-pressure discharge lamp is not particularly limited, but if the power is as low as 50 W or less, it is easy to reduce the size of the lighting circuit means.

The term "lamp power" refers to the power consumed by the high-pressure discharge lamp when the high-pressure discharge lamp is connected to the lighting circuit means and the high-pressure discharge lamp is stably lit.

[Regarding Metallic Conductive Film]

The metallic conductive film is mounted on at least one of the pair of electrodes on the outer periphery of the small-diameter cylindrical portion of the translucent ceramic discharge vessel through which the electrode is inserted, and one end is connected to the other electrode. They are connected so that they have the same potential.
That is, the metal conductive film can be provided for both or one of the pair of electrodes. Then, a high voltage is applied between the metal conductive film and the electrode facing the metal conductive film at the time of starting. Therefore, "one end of the metal conductive film is connected to be at the same potential as the other electrode" means that the electrode where the metal conductive film is opposed via the small-diameter cylindrical portion is one electrode. Sometimes, this means that one end of the metal conductive film is connected to a power supply conductor connected to the other electrode, a connection conductor connected to the power supply conductor, or the like.

It is preferable that the metal conductive film is formed so as to be as close as possible to the outer surface of the small-diameter cylindrical portion. In the present invention, the cover means formation by a vapor deposition film, cover through an adhesive, fitting by fitting, and the like.

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

[About outer tube]

The outer tube is a means for hermetically storing the arc tube therein.

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 is made of a material having appropriate translucency, airtightness, heat resistance and workability. For example, it is practical to use hard glass, semi-hard glass, quartz glass, or the like. However, if necessary, translucent ceramics, crystalline glass, or the like can be used.

Further, the outer tube may adopt either one-sided sealing or both-sided sealing as desired. However, when the outer tube has a one-sided sealing structure, it is suitable for aligning the axis of the high-pressure discharge lamp with its optical axis when using a reflecting mirror.

Further, a known seal structure such as a pinch seal, a flare seal, a bead seal, and a button stem seal can be used for sealing the outer tube.

[About a pair of external connection terminals]

The pair of external connection terminals are connected to a pair of electrodes of the arc tube housed in the outer tube, and are led out of the outer tube to the outside to introduce electric energy from the external lighting circuit means. It functions as connecting means and, if necessary, as means for supporting the high-pressure discharge lamp.

When a connection conductor is used to supply power to the arc tube, an external connection terminal can be formed integrally with the connection conductor. However, they may be formed separately from each other and connected by a fixing means such as welding through a sealing metal in the sealing portion of the outer tube.

Further, a pair of external connection terminals can be assembled on one side of the outer tube and extended outward. This facilitates connection of the lighting circuit means to the high-frequency output terminal. However, if necessary, a pair of external connection terminals can be separated and led out from both ends of the outer tube.

Further, the external connection terminal may protrude outward from the outer tube, or may be in contact with the periphery of the outer tube. In a mode of projecting outward from the outer tube, the projecting portion may directly constitute a connection pin, or may have a configuration functioning as a connection line to a base. On the other hand, in a mode in which the outer tube is in contact with the periphery of the outer tube, if a portion of the outer tube in contact with the outer tube is a pinch seal portion, a so-called non-stick structure is obtained.

Further, the pair of external connection terminals can be provided with a structure and a material suitable for connection with the high-frequency output terminal of the lighting circuit means. For this reason, even if at least the sealing metal is used for the portion penetrating the sealing portion of the outer tube, the contact resistance is low for the portion connected to the lighting circuit means, and there is no problem in mechanical strength with brass, A contact piece made of copper or the like can be used.

[Operation of the present invention] In the high-pressure discharge lamp of the present invention, the electrode is inserted through a small gap inside the small-diameter cylindrical portion, and the discharge is performed inside the small gap during stable lighting. The medium stays in the liquid phase, and the temperature of the surface, that is, the interface of the staying discharge medium becomes the coldest part temperature of the high-pressure discharge lamp, and determines the vapor pressure of the discharge medium.

On the other hand, in the glow discharge at the time of starting,
The discharge medium staying in the small gap evaporates temporarily. It is desirable that the evaporation of the discharge medium be performed within an appropriate time at the start.

In the present invention, since the metal conductive film is mounted on the outer periphery of at least one of the small-diameter cylindrical portions of the translucent ceramic discharge vessel, at the time of starting, the electrodes and the outer periphery of the small-diameter cylindrical portion facing the electrodes are formed. Since a relatively high voltage at the time of starting is applied to the metal conductive film formed on the substrate, a minute discharge is generated therebetween through the ceramic of the small-diameter cylindrical portion to assist the starting. As a result, the starting voltage is significantly reduced. In addition, since the metal conductive film faces the vicinity of the interface of the discharge medium, the evaporation of the discharge medium is promoted at the start.

Further, since the metal conductive film is closely arranged in a planar shape, the electric energy is bypassed due to the minute discharge, so that the glow-arc transition at the electrode facing the metal conductive film is caused. The time tends to be stretched compared to the absence of a metallic conductive film, which is effective for optimizing the glow-arc transition time, thereby suppressing blackening at startup. You can also.

A high-pressure discharge lamp according to a second aspect of the present invention is a translucent ceramic discharge lamp having a surrounding portion surrounding a discharge space, and a pair of small-diameter cylindrical portions arranged in communication with both ends of the surrounding portion and having an inner diameter smaller than the surrounding portion. The elongated first and second electrodes inserted into the small-diameter cylindrical portion while forming a slight gap between the container and the inner surface of the small-diameter cylindrical portion of the translucent ceramic discharge container, and the inside of the translucent ceramic discharge container. An arc tube provided with a discharge medium sealed in the first electrode; mounted on the outer periphery of one of the small-diameter cylindrical portions through which the first electrode is inserted, and connected at one end to have the same potential as the second electrode. A first conductive film made of metal, which is mounted on the outer periphery of the other small-diameter cylindrical portion through which the second electrode is inserted, and one end of which is connected to have the same potential as the first electrode. A second metallic conductive film; an arc tube and An outer tube in which the first and second metal conductive films are hermetically housed; and a pair of external connection terminals connected to the first and second electrodes and hermetically drawn out from the outer tube to the outside. It is characterized by having.

According to the present invention, the first and second metal conductive films are provided on the outer periphery of the small-diameter cylindrical portion so as to face the first and second electrodes, respectively.

Thus, in the present invention, the starting voltage is further reduced as compared with the configuration in which the metal conductive film is provided so as to face only one of the electrodes.

Further, since the first and second metal conductive films are provided on the first and second electrodes, respectively, the glow-arc transition time of each electrode is optimized in a well-balanced manner. It is effective for things. For this reason, the glow-arc transition times of the respective electrodes are easily made uniform, and blackening at the time of starting can be further suppressed.

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 pair of small-diameter cylindrical portions arranged in communication with both ends of the surrounding portion and having an inner diameter smaller than the surrounding portion. A pair of elongated electrodes inserted into the small-diameter cylindrical portion while forming a small gap between the container and the inner surface of the small-diameter cylindrical portion of the translucent ceramics discharge container, and sealed in the translucent ceramics discharge container A light-emitting tube provided with a discharge medium; a first tube mounted on the outer periphery of one small-diameter cylindrical portion through which one electrode is inserted, and one end of which is connected to have the same potential as the other electrode. A metal conductive film; a second metal conductive film provided on the other small-diameter cylindrical portion through which the other electrode is inserted; an arc tube, and the first and second metal conductive films are hermetically sealed. With outer tube housed; connected to electrodes It is characterized in that it comprises a; pair of external connection terminals derived airtight to the outside from the outer tube.

The present invention is the same as claim 2 in that a pair of metal conductive films are provided, but the second metal conductive film is not connected to one electrode. Therefore, the second metal conductive film is in a conductively floating state.

However, the second metal conductive film is capacitively coupled to the second electrode.

Thus, in the present invention, the first metal conductive film connected to the other electrode is the same as the preceding claim, but in addition to this, the second metal conductive film Shows a tendency for the glow-arc transition time of the second electrode to extend somewhat during startup. This makes it easier to control the glow-arc transition time when starting the second electrode to a desired range. That is, some effect is recognized on blackening suppression at the time of starting.

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 one end of the metal conductive film has a boundary with the surrounding portion of the transparent ceramic discharge vessel. It is characterized by being located in the vicinity.

According to the present invention, a suitable arrangement position of the metal conductive film is specified.

That is, since one end of the metal conductive film is located near the boundary with the surrounding portion, the metal conductive film can be easily positioned and the metal conductive film can be easily fixed. It is also possible to design a high-pressure discharge lamp such that the interface of the discharge medium faces the metal conductive film.

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 metal conductive film is provided on the side opposite to the surrounding portion of the transparent ceramic discharge vessel. It is characterized in that the located end is connected to have the same potential as the electrode on the opposite side.

The present invention stipulates a preferable selection of the end to be connected to the electrode of the metal conductive film. That is, by connecting the end located on the opposite side to the surrounding portion to the electrode, the influence of the connection portion of the metal conductive film on the light distribution of the high-pressure discharge lamp can be reduced.

Further, when the metal conductive film is connected to the electrode, the surrounding portion of the light-transmitting ceramic discharge vessel is hardly obstructed, so that the connection workability is good.

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 electrode has a shaft at a position where at least a part thereof faces the metal conductive film. It is characterized by having a coil body mounted on the part.

The coil diameter, number of turns, and winding pitch are not limited, assuming that the coil body can be disposed inside the small-diameter cylindrical portion of the translucent ceramics discharge vessel.

Also, with respect to a slight gap formed from the coil body to the end of the small-diameter cylindrical portion, the discharge medium enters and exits through a gap formed between the coil body and the small-diameter cylindrical portion. Stays in the liquid phase in a small gap.

Thus, in the present invention, the starting voltage is further reduced by disposing the coil body on the shaft of the electrode. Also, the glow-arc transition time can be controlled as desired, for example, lengthened. The reason for the above effect is not clear, but the facing area between the metal conductive film located outside the small-diameter cylindrical portion is increased, and the length of the gap between the two is reduced. It is estimated that the electric capacity increases.

Further, the present invention is effective when the diameter of the shaft portion of the electrode is smaller than the inner diameter of the small-diameter cylindrical portion and the slight gap is large.

According to a seventh aspect of the present invention, there is provided a high-pressure discharge lamp according to any one of the first to sixth aspects, wherein a room temperature is applied between the metallic conductive film and the electrodes connected to the metallic conductive film. A bimetal that comes into contact with the lamp at some time and dissociates at the time of lighting when the temperature of the arc tube rises. <About Bimetal>

A bimetal is a metal in which a high expansion metal and a low expansion metal are superimposed, and as the temperature rises,
It is a metal that curves to the low expansion side. The bimetal material is a Ni-Fe alloy as the low expansion metal, a Mn-Cu-Ni alloy, a Ni-Cr-Fe alloy, Ni-
Mn-Fe alloy is used, and Ni, C
In some cases, u and Cu alloys are used. Since the allowable use temperature is exposed to the radiant heat of the lamp, it is preferable that the allowable use temperature can withstand a relatively high temperature. For example, 350C-4
A high-temperature bimetal that can withstand a temperature of 50 ° C. is suitable. In addition, a metal plate having a shape of 0.01 to 0.3 mm and a width of 1.0 mm to 10 mm is preferable as a shape that does not hinder the light distribution of the lamp during lighting.

The bimetal is provided between the electrodes connected to the metallic conductive film, for example, when the electrode facing the metallic conductive film via the small-diameter cylindrical portion is one electrode. This means that one end of the bimetal is welded to a power supply conductor connected to the other electrode or a connection conductor connected thereto, and the other end is attached to the metallic conductive film.

By the connection as described above, before starting at room temperature, the opposing electrode is electrically connected to the metallic conductive film through the power supply conductor or the connection conductor connected thereto. Therefore, it is effective for the structure of startability. Thereafter, when the temperature inside the outer tube rises when the lamp is turned on, the bimetal operates according to the temperature of the arc tube at the time of lighting, and the metal conductive film is dissociated from the power supply conductor or the connection conductor connected thereto. As a result, compared to a state in which the metallic conductive film and the power supply conductor or the connection conductor connected thereto remain connected, the heat of the arc tube is connected to the power supply conductor or the power supply conductor through the metal conductive film. Since the heat is not transmitted to the connecting conductor or the like and the luminous tube is no longer radiated, the temperature of the luminous tube can be kept high, and a decrease in the efficiency of the lamp can be suppressed.

A high pressure discharge lamp lighting device according to an eighth aspect of the present invention is a high pressure discharge lamp according to any one of the first to seventh aspects; and lighting circuit means mainly constituted by an inverter for lighting the high pressure discharge lamp at high frequency. ; Characterized by having;

[Arrangement of high pressure discharge lamp and lighting circuit means]

In the present invention, the high-pressure discharge lamp and the lighting circuit means only need to be connected on an electric circuit, and therefore, they may be spatially separated from each other.
They may be arranged so as to be lighted in a state where they are mechanically connected to each other. For example, in the former arrangement, the high-pressure discharge lamp is mounted on the lighting equipment, but the lighting circuit means is arranged at a distance from the lighting equipment such as the ceiling.
An example of the latter arrangement is an embodiment that constitutes a bulb-type high-pressure discharge lamp described later.

[Regarding Lighting Circuit Means] 1. In the present invention, “high frequency” refers to a frequency of 5 kHz.
It says above. 2. Lighting circuit means for a fluorescent lamp can be used to reduce the size of the lighting circuit means. The lighting circuit means for a fluorescent lamp has a continuous load characteristic from a secondary open-circuit voltage to a secondary short-circuit current. In the present invention, the lighting circuit means manufactured for the fluorescent lamp can be used. 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.

[0085] In the present invention, it is possible to set a relatively flexibility range larger secondary open-circuit voltage V ₂₀ of the lighting circuit means. That is, in general, the ratio V ₂₀ / Vs (%) of the secondary opening voltage V ₂₀ of the lighting circuit means to the discharge starting voltage Vs of the high-pressure discharge lamp can be set in the following range. 110 ≦ V ₂₀ / Vs ≦ 300

The discharge starting voltage Vs of the high pressure discharge lamp
Since there is statistical variation, it is necessary to pay close attention to its identification.

Incidentally, the basic circuit configuration of the lighting circuit means may be any as long as it has the above-mentioned load characteristics. 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. 3. The operating frequency of the lighting circuit means can be in the range of 5 to 200 kHz. 4. Lighting circuit means mainly composed of a high-frequency inverter having an LC resonance circuit can be used.

As an inverter satisfying the above conditions, a half-bridge type inverter, a single-type inverter such as a rocking oscillation type inverter, a parallel inverter, and 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 close 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. If the operating frequency is shifted away from the resonance frequency after the lighting, the output voltage decreases. Therefore, the load characteristics of the lighting circuit means can be made continuous from the secondary open-circuit voltage to the secondary short-circuit current, with the secondary open-circuit voltage approaching the discharge starting voltage of the high-pressure discharge lamp.

When 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, by using an inverter having an LC resonance circuit, 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 made a sine wave.

[About glow-arc transition time]

By configuring the glow-arc transition time of the high-pressure discharge lamp to be in the range of 0.5 to 3.0 seconds, preferably 1.0 to 2.5 seconds, a small lighting circuit means can be provided. When used and turned on, blackening at the time of starting can be significantly reduced.

The glow-arc transition time is determined by measuring the descent point of the lamp voltage waveform using an oscilloscope,
It shall be determined by the average value of the times. Note that the falling point of the ramp voltage waveform must be the falling point when both electrodes undergo glow-arc transition. Therefore, not only is the pair of electrodes glow-arc transferred simultaneously, but also if there is a time lag, it is a descent point for the electrode that later glow-arc transferred.

By the way, the glow-arc transition time is set to 0.
If the time is less than 5 seconds, a large amount of glow-arc transition power is applied in a short time, and excessive heating of the electrode is performed. Is promoted, and the luminous flux maintenance ratio is too low, so that it is impossible.

If the glow-arc transition time exceeds 3.0 seconds, the glow-arc transition time becomes longer, and consequently the sputtering of the electrode becomes remarkable, and the blackening at the time of starting is promoted. This is not possible because the luminous flux maintenance rate decreases.

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 is the time during which the high-pressure discharge lamp was turned on for 165 minutes and then turned off for 15 minutes.

Further, the glow-arc transition time can be set within the above range by appropriately setting the specifications of the high pressure discharge lamp and / or the matching with the lighting circuit means.

A lighting device according to a ninth aspect of the present invention is characterized by comprising a lighting device main body; and a high-pressure discharge lamp lighting device according to the eighth aspect, which is provided in the lighting device main body.

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-shaped 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 in the lighting device main body, or may be arranged at a position separated from the lighting circuit body, for example, on the ceiling.

Next, in the case of forming a bulb-type high-pressure discharge lamp, 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 action may 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.

In the case where the lighting device is a lighting fixture, the lighting device body may be provided with a lighting circuit means and a lamp socket, and the 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.

[0110]

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 cross-sectional front view of an enlarged main part.

FIG. 3 is a partially sectional front view showing the state of the wire valve before the base is attached.

In each of the figures, the high-pressure discharge lamp includes an arc tube IB, a first connection conductor CC1, a second connection conductor CC2,
First and second metal conductive films CO1, CO2, outer tube O
B, a pair of external connection terminals OCT1, OCT2, getter G
T and 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 with both ends narrowed by continuous curved surfaces. 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 section 2b is mounted on the tip of the shaft section 2a.

The introduction conductor 3 is made of niobium and has a rod-like shape. The leading end of the leading conductor 3 is butted to the base ends of the electrodes 2A and 2B, and the base is projected outside the translucent ceramic discharge vessel 1. I have.

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 translucent ceramics discharge vessel 1. The discharge vessel 1 is hermetically sealed, and the lead conductor 3 is covered so as not to be exposed inside the translucent ceramic discharge vessel 1. Also,
By this sealing, the electrodes 2A and 2B are fixed at predetermined positions.

To form the seal 4, the translucent ceramics discharge vessel 1 is set in a vertical position, and the ceramic sealing compound is formed on the end face of the small-diameter cylindrical portion 1b at the portion protruding outside the introducing conductor 3. Applied to the surroundings, heated and melted to enter the gap between the introducing conductor 3 and the inner surface of the concave portion 1c and inserted into the small-diameter cylindrical portion 1b.
And the base end of the electrode 2 is further covered 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.

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 small gap g at the time of stable lighting. The interface of the discharge medium 5 forms the coldest part.

<First and second connection conductors CC1, CC
About 2>

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

<First and second metal conductive films CO1,
About CO2>

The first metal conductive film CO1 is provided on the outer periphery of the small-diameter cylindrical portion 1b through which the first electrode 2A is inserted, and the conductive film end on the side of the power supply conductor 3 is formed. It extends in the axial direction of the translucent ceramics discharge vessel 1 and is connected to the power supply conductor 3 on the second electrode 2B side.

The second metal conductive film CO2 is mounted on the outer periphery of the small-diameter cylindrical portion 1b through which the second electrode 2B is inserted, and the end on the side of the power supply conductor 3 is connected to the first connection. Connected to conductor CC2.

<About outer tube OB>

The outer tube OB is made of a T-shaped bulb made of hard glass. A pinch seal portion ps is formed at a base end, and an exhaust tip off portion t is formed at a distal end.
0 ^- of about ⁴ torr are in a low vacuum state.

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 sealing off the exhaust tube (not shown).

<Pair of External Connection Terminals OCT1, OCT2>
About>

A pair of external connection terminals OCT1, OCT2
Are formed integrally with the first and second connection conductors CC1 and CC2 by extending them and protruding outward from the outer tube OB as they are before the base B as the power receiving means is attached.

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

<About the base B>

The base b is made of an E11 type screw base, connects the pair of external connection terminals OCT1 and OCT2 as required, and is fixed to the pinch seal portion ps of the outer tube OB with an inorganic adhesive (not shown). I have.

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

<Emitting tube>

Translucent ceramics discharge vessel: made of translucent alumina ceramics, total length 23 mm, outer diameter of surrounding portion 1 a is 6 mm, inner diameter 5 mm (wall thickness 0.5 mm), and small-diameter cylindrical portion 1 b is outer diameter 1.7 mm , 0.7mm inside diameter (0.5m wall thickness)
m), length L2 is 8 mm

Electrode: shaft part and coil part are 0.2 m in diameter
m of tungsten

Distance between electrodes: 3.5 mm

Introduced conductor: niobium, diameter 0.64 mm

Small gap g: 0.25 mm

Discharge medium: Ne3% + Ar at 200 torr, 2.0 mg of mercury and 2.0 mg of metal halide of NaI-TlI-InI-DyI3 are sealed as a starting gas and a buffer gas as a luminescent metal halide as a starting gas and a buffer gas. . (The halide of the luminescent metal is sealed in such an amount that the surplus does not evaporate during lighting and the surplus remains in a small gap.)

First and second metal conductive films: thickness of 0.
A 3 mm molybdenum film is covered closely from the position adjacent to the surrounding portion to the outer periphery of the small-diameter cylindrical portion, and the total length is about 4 mm.
Starting voltage: 0.7 kVp-p (Note that the starting voltage is 3.0 kVp-p in the case of the comparative example having the same specifications as the present example except that the first and second metal conductive films are not provided. .)

Glow-arc transition time: 1.4 seconds for the first electrode, 1.6 seconds for the second electrode

FIG. 4 is a partially sectional front view showing a second embodiment of the high-pressure discharge lamp of the present invention.

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

In the present embodiment, the first metal conductive film CO1
Are not connected to the second electrode 2B.

That is, the first metal conductive film CO1 is:
It is in a conductively floating state.

Thus, the starting voltage was 0.9 kVp-p. The glow-arc transition time of the first electrode 2A was 0.6 seconds, and the glow-arc transition time of the second electrode 2B was 1.3 seconds.

Further, external connection terminals OCT1, OCT2
The capacitance between them is approximately 1.8 to 1.9 pF.

FIG. 5 is a partially sectional front view showing a third embodiment of the high-pressure discharge lamp of the present invention.

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

In this embodiment, the second metal conductive film CO2
Only in that it is only covered.

Thus, the starting voltage was 1.0 kVp-p. The glow-arc transition time of the first electrode 2A was 0.6 seconds, and the glow-arc transition time of the second electrode was 1.4 seconds.

Further, external connection terminals OCT1, OCT2
The capacitance between them is approximately 1.1 to 1.8 pF.

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

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

In the present embodiment, the shaft 2a of the electrodes 2A and 2B
In that the coil bodies MC1 and MC2 are provided in portions facing the metal conductive films CO1 and CO2.

That is, the coil bodies MC1 and MC2 are formed by covering the shaft portion 2a with eight turns of a tungsten wire having a diameter of 0.2 mm.

Therefore, a gap of 0.05 mm is formed between the coil bodies CO1, CO2 and the inner surface of the small-diameter cylindrical portion 1b, and a spiral gap is also formed between the turns of the coil bodies CO1, CO2. .

FIG. 7 is a partially sectional front view showing a fifth embodiment of the high-pressure discharge lamp of the present invention.

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

In this embodiment, the metal conductive films CO1, CO
2 and the connection conductors CC1 and CC2 are connected via bimetals B1 and B2. Bimetal B1, B
2 has one end welded to the connection conductors CC1 and CC2,
The other end is disposed so as to be in contact with the metallic conductive films CO1 and CO2 at normal temperature. The materials of the bimetals B1 and B2 are
The low expansion metal having a heat resistance temperature of 450 ° C. was made of Ni42% -Fe, and the high expansion metal was made of Ni-Mn-Fe alloy.

The starting voltage of this lamp was 0.7 Vp-p. The glow-arc transition time was 1.4 seconds for the first electrode and 1.6 seconds for the second electrode.

The efficiency of the lamp at the time of lighting (lm)
/ W), color temperature (K), and chromaticity difference (duv) are shown in Table 1 in comparison with the first embodiment.

[Table 1]

As is apparent from Table 1, the lamp of the present embodiment has improved lamp efficiency, color temperature, and color shift as compared with the lamp of Embodiment 1. This is because in the case of the lamp of the first embodiment, the temperature of the arc tube IB is transmitted to the metallic conductive films CO1 and CO2 and the connection conductors CC1 and CC2 and radiated when the lamp is turned on, so that the temperature of the arc tube IB is reduced. ing.

As in the fourth embodiment, the metal conductive films CO1, CO
2 and bimetals B1, B between connecting conductors CC1, CC2
2, the metal conductive film C during lighting
This is because O1 and CO2 are dissociated from the bimetals B1 and B2, and the temperature of the arc tube IB can be kept high without being transferred. Therefore, it is possible to provide a lamp with high efficiency and a reduced variation in color temperature.

FIG. 8 is a circuit diagram showing lighting circuit means in one embodiment of the high pressure discharge lamp lighting device of the present invention.

In the drawing, AS is a low-frequency AC power supply, f is an overcurrent fuse, NF is a noise filter, RD is a rectified DC power supply, Q1 is a first switching means, and Q2 is a second switching means.
Switching means, GD is a gate drive circuit, ST
Is a starting circuit, GP is a gate protection circuit, LC is a load circuit, and c and d are receivers 14 for connecting the high-pressure discharge lamp 11.
b shows the insertion position.

The low-frequency AC power supply AS is a 100 V commercial power supply.

The overcurrent fuse f is a pattern fuse formed integrally with 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 rectifier circuit BR is connected to the low frequency AC power supply AS via a noise filter NF and an overcurrent fuse f. A DC output terminal is connected to both ends of the smoothing capacitor C2 to supply a smoothed DC.

The first switching means Q1 is composed of an N-channel type 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, the source of which is connected to the source of the first switching means Q1, and the drain of which is connected to the minus side of the smoothing capacitor C2.

Therefore, the first and second switching means Q1 and 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 SRC and gate voltage output circuit GO
Consists of

The feedback means FBC comprises an auxiliary winding magnetically coupled to a current limiting inductor L2 described later.

The series resonance circuit SRC comprises a series circuit of an inductor L3 and a capacitor C3, both ends of which are connected to feedback means FBC.

The gate voltage output means GO is configured to extract a resonance voltage appearing across the capacitor C3 of the series resonance circuit SRC via the capacitor C4. 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 respective gates of the first and second switching means Q1, Q2. Further, the capacitor C3
Are connected to the first and second switching means Q1, Q2.
Connected to the source. As a result, the resonance voltage appearing at both ends of the capacitor C3 is applied between the gate and source of the first and second switching means Q1, Q2 via the gate voltage output circuit GO.

The starting circuit ST includes resistors R1, R2, R3
Consists of

The resistor R2 has one end connected to the positive side of the smoothing capacitor C2, the other end connected to the gate of the first switching means Q1, and one end of the resistor R2 and the gate drive circuit GD. It is connected to the gate-side output terminal of the gate voltage output circuit GO, that is, the other end of the capacitor C4.

The other end of the resistor R2 is connected to a series resonance circuit SRC
Is connected to the connection point of the inductor L3 and the feedback circuit FBC.

The resistor R3 has one end connected to the first and second resistors.
Of the switching means Q1, Q2, that is, the source and the source side of the gate voltage output circuit GO, and the other end is connected to the minus side of the smoothing capacitor C2.

The gate protection circuit GP is formed by connecting a pair of Zener diodes in series and in reverse.
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.
The other end is connected to the high-frequency output end d.

At positions c and d, a lamp socket is inserted, through which a high-pressure discharge lamp HLP is connected to lighting circuit means.

The high pressure discharge lamp HPL is shown in FIGS.
Is provided.

The current limiting inductor L2 and the resonance capacitor C6
Forms a series resonance circuit. Since the DC cut capacitor C5 has a large capacitance, it does not significantly affect the 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 mainly corresponding to a proportional ratio of the resistance values of the resistors R1, R2 and R3 appears at both ends of the resistor R2. 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.

FIG. 9 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, 11 is a spotlight body,
12 is a high pressure discharge lamp.

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 section 11a is mounted on the ceiling to suspend the spotlight, and is connected to lighting circuit means (not shown) disposed behind the ceiling to receive power therefrom.

The base end of the arm 11b is fixed to the current collector 11a.

The main body case 11c has a container shape with an open front surface, and is pivotally attached to the tip of the arm 11b in a vertical plane so as to be freely raised. Note that the two-dot chain line in the drawing describes the range in which the angle of the arm 11b can be adjusted with respect to the main body case 11c.

The lamp socket 11d is suitable for an E11 base and is disposed in the main body case 11c.

[0206] The reflecting mirror 11e is provided in the main body case 11c in front of the lamp socket 11d.

The light shielding tube 11f is provided at the center of the opening end of the reflecting mirror 11e.

The front glass 11g is provided at the open end of the main body case 11c.

The high-pressure discharge lamp 12 has the same specifications as those shown in FIGS. 1 to 3, 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 has its base B connected to the lamp socket 11d.
By attaching to the spotlight main body 11, it is attached.

Further, when the high-pressure discharge lamp 12 is mounted, the light-shielding tube 11f shields light from the tip of the outer tube OB to prevent glare. FIG. 9 shows a fourth embodiment of the high-pressure discharge lamp of the present invention and 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. 5 except for the base, and has an external connection terminal OCT.
1, OCT2 projects upward from the pinch seal portion ps of the outer tube OB in the figure. The same parts as those in FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted.

[About pedestal 13]

The pedestal 13 is formed by molding a heat-resistant synthetic resin, and has a mounting hole 13a at the center, a mounting portion 13b at the upper outer peripheral edge in the figure, and a hollow cup-shaped skirt portion 13c at the lower outer peripheral edge. ing.

The mounting hole 13a is for mounting the high-pressure discharge lamp 12 and the reflector 14, and the pinch seal portion ps of the high-pressure discharge lamp 12 inserted therein and the edge 14a of the reflector 14 described later are concentric. And is fixed via an inorganic adhesive BC.

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.

[About Reflector 14]

The reflecting mirror 14 is disposed around the high-pressure discharge lamp 12 and surrounds at least the light-emitting portion, that is, the surrounding portion 1a of the high-pressure discharge lamp 12. The reflecting mirror 14 is fixed to the base 13. In the present embodiment, as described above, the high-pressure discharge lamp 12
Is fixed together with.

The reflecting mirror 14 is formed into a cup-like 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. are doing. 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 at the opening of the reflecting mirror 13. The front surface 14b is manufactured by molding 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 the 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.
From the lower surface of the external connection terminal OCT of the high-pressure discharge lamp 12
1 and OCT2, and are connected to the wiring board 15a as required.

The lighting circuit means 15 has the same circuit configuration as in FIG.

[About the base 16]

The base 16 has a cup shape, a base 17 to be described later is mounted on a base thereof, and a peripheral step 1 is provided on an opening edge.
6a are formed. 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.

[About the base 17]

The base 17 is made of an E26 type base, and is mounted on the base of the base 16.

[0231]

According to the first to seventh aspects of the present invention, at least one of a light-transmitting ceramic discharge vessel, an arc tube having a pair of electrodes and a discharge medium, and a small-diameter cylindrical portion of the light-transmitting ceramic discharge vessel. A metal conductive film which is mounted on the outer periphery of the device and has one end connected to be at the same potential as the electrode on the opposite side; By providing a pair of external connection terminals that are airtightly drawn out from the tube to the outside, the metal conductive film is easily and evenly adhered to the small-diameter cylindrical portion. However, the present invention can provide a high-pressure discharge lamp with little variation, a sufficiently low starting voltage and a small lighting circuit means.

According to the invention of claim 2, in addition to the first and second metal conductive films, the first metal conductive film is provided on the outer periphery of the small-diameter cylindrical portion through which the first electrode is inserted. Second wearing
And the second metal conductive film is mounted on the outer periphery of the small-diameter cylindrical portion through which the second electrode is inserted so as to be at the same potential as the first electrode. By the connection, it is possible to provide a high-pressure discharge lamp in which the starting voltage is further reduced, the lighting circuit means can be reduced in size, and the glow-arc transition time is extended.

According to the third aspect of the present invention, in addition, the first metal conductive film floats conductively, and the second metal conductive film is connected so as to have the same potential as the other electrode. Thus, the starting voltage can be reduced sufficiently, the size of the lighting circuit means can be reduced, and a high-pressure discharge lamp which is somewhat effective in extending the glow-arc transition time can be provided.

According to the invention of claim 4, in addition, since one end of the metal conductive film is located near the boundary with the surrounding portion of the light-transmitting ceramic discharge vessel, positioning of the metal conductive film is easy. In addition, it is possible to provide a high-pressure discharge lamp that can be easily set.

According to the invention of claim 5, in addition to the above, the end of the metal conductive film opposite to the surrounding portion is connected to the other electrode side, so that light distribution is less disturbed, and It is possible to provide a high-pressure discharge lamp in which a metal conductive film can be easily connected.

According to the sixth aspect of the present invention, in addition to the above, at least a part of the electrode is provided with a coil body mounted on the shaft at a position facing the metal conductive film. A high-pressure discharge lamp capable of controlling the glow-arc transition time while reducing the voltage can be provided.

According to the seventh aspect of the present invention, in addition, a bimetal that contacts at normal temperature and dissociates at the time of lighting is provided between the metallic conductive film and the external connection terminal. Efficiency,
A high-pressure discharge lamp having an improved color temperature can be provided.

According to the eighth aspect of the present invention, it is possible to provide a high pressure discharge lamp lighting device having the effects of the first to seventh aspects.

According to the ninth aspect of the present invention, the first aspect does not have the eighth aspect.
It is possible to provide a lighting device having the above-mentioned effect.

[Brief description of the drawings]

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

FIG. 2 is an enlarged cross-sectional front view of the main part

FIG. 3 is a partially sectional front view showing the state of the wire valve before the base is attached.

FIG. 4 is a partially sectional front view showing a second embodiment of the high-pressure discharge lamp of the present invention.

FIG. 5 is a partial cross-sectional front view showing a third embodiment of the high-pressure discharge lamp of the present invention.

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

FIG. 7 is a partially sectional front view showing a fifth embodiment of the high-pressure discharge lamp of the present invention.

FIG. 8 is a circuit diagram showing lighting circuit means in one embodiment of the high-pressure discharge lamp device of the present invention.

FIG. 9 is a partial cross-sectional side view showing a spotlight as a first embodiment of the lighting device of the present invention.

FIG. 10 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 ceramics discharge vessel 1a: surrounding portion 1b: small-diameter cylindrical portion 3: power supply conductor 4: seal CO2: first metal conductive film CO1: second metal conductive film OB: outer tube ps: Pinch seal part B1, B2: Bimetal

Claims (9)

[Claims] 1. A light-transmitting ceramic discharge vessel, comprising: a surrounding portion surrounding a discharge space; and a pair of small-diameter cylindrical portions disposed in communication with both ends of the surrounding portion and having an inner diameter smaller than the surrounding portion. A pair of elongated electrodes inserted into the small-diameter tube portion while forming a small gap with the inner surface of the small-diameter tube portion, and an arc tube having a discharge medium sealed in a translucent ceramic discharge vessel; A metal conductive film mounted on the outer periphery of the small-diameter cylindrical portion through which at least one electrode is inserted and connected to have the same potential as the other electrode; And a pair of external connection terminals connected to the pair of electrodes and hermetically derived from the outer tube to the outside. 2. A light-transmitting ceramic discharge vessel, comprising: a surrounding portion surrounding a discharge space; and a pair of small-diameter cylindrical portions disposed in communication with both ends of the surrounding portion and having an inner diameter smaller than the surrounding portion. Elongated first and second electrodes inserted into the small-diameter tube portion while forming a small gap with the inner surface of the small-diameter tube portion, and a discharge medium sealed in a translucent ceramics discharge vessel. An arc tube; a first metal conductive member mounted on the outer periphery of one of the small-diameter cylindrical portions through which the first electrode is inserted and having one end connected to be at the same potential as the second electrode; A second metal conductive film mounted on the outer periphery of the other small-diameter cylindrical portion through which the second electrode is inserted and one end of which is connected to have the same potential as the first electrode; And an arc tube, and first and second arc tubes
And a pair of external connection terminals connected to the first and second electrodes and hermetically drawn out from the outer tube to the outside. And high pressure discharge lamp. 3. A light-transmitting ceramic discharge vessel, comprising: a surrounding portion surrounding a discharge space; and a pair of small-diameter cylindrical portions disposed in communication with both ends of the surrounding portion and having an inner diameter smaller than the surrounding portion. A pair of elongated electrodes inserted into the small-diameter tube portion while forming a small gap with the inner surface of the small-diameter tube portion, and an arc tube having a discharge medium sealed in a translucent ceramic discharge vessel; While being mounted on the outer periphery of one small-diameter cylindrical portion through which one electrode is inserted,
A first metal conductive film having one end connected to be at the same potential as the other electrode; and a second metal conductive film mounted on the other small-diameter cylindrical portion through which the other electrode is inserted. An outer tube in which the arc tube and the first and second metal conductive films are hermetically housed; and a pair of external connection terminals connected to the pair of electrodes and hermetically drawn out of the outer tube to the outside. A high-pressure discharge lamp, comprising: 4. The high-pressure discharge lamp according to claim 1, wherein one end of the metal conductive film is located near a boundary between the transparent conductive ceramic discharge vessel and the surrounding portion. . 5. The metal conductive film is connected such that an end located on the side opposite to the surrounding portion of the light-transmitting ceramic discharge vessel has the same potential as an electrode on the opposite side. A high-pressure discharge lamp according to any one of claims 1 to 4. 6. The electrode according to claim 1, wherein the electrode has a coil body mounted on a shaft portion at a position at least part of which faces the metal conductive film. 2. The high-pressure discharge lamp according to claim 1. 7. A bimetal that is in contact at room temperature and dissociates when the temperature of the arc tube rises is disposed between the metallic conductive film and the electrodes connected to the metallic conductive film. Item 7. A high-pressure discharge lamp according to any one of Items 1 to 6. 8. A high-pressure discharge lamp according to any one of claims 1 to 7, and lighting circuit means mainly constituted by an inverter for lighting the high-pressure discharge lamp at high frequency. High pressure discharge lamp lighting device. 9. A lighting device comprising: a lighting device main body; and the high pressure discharge lamp lighting device according to claim 8, which is disposed in the lighting device main body.