JP4182443B2 - High pressure discharge lamp, high pressure discharge lamp lighting device and lighting device - Google Patents

Description

  The present invention relates to a high-pressure discharge lamp including a translucent ceramics discharge vessel, a high-pressure discharge lamp lighting device using the same, and an illumination device.

  In recent years, as a light source for an optical fiber or a halogen light bulb, a small metal halide lamp having a lamp power of about 10 to 30 W and a small high-pressure discharge lamp apparatus in which this is combined with a small lighting circuit means and a base is mounted, that is, A bulb-type high-pressure discharge lamp has been developed by the present inventors. This bulb-type high-pressure discharge lamp has a lamp efficiency of about 3 to 4 times that of a halogen bulb and is significantly smaller than that of a bulb-type fluorescent lamp, so that it can be treated as a point light source.

  However, since it is a high-pressure discharge lamp, it is necessary to use a ballast incorporating an igniter for generating a relatively high pulse voltage at start-up, that is, a lighting circuit means or a lighting circuit means not incorporating an igniter, and a separate igniter. There is. Under such circumstances, even if a small-sized high-pressure discharge lamp is developed, it will become large in the end when the light source, ballast, that is, the lighting circuit means and the lighting fixture are regarded as a system. On the other hand, a bulb-type fluorescent lamp in which a compact fluorescent lamp and its lighting circuit means are integrated and a base is attached is conventionally used as a light source as an alternative to an incandescent bulb. Since this bulb-type fluorescent lamp is also a discharge lamp, a lighting circuit means is required. However, compared with a lighting circuit means for a high-pressure discharge lamp, that of a bulb-type fluorescent lamp is overwhelmingly small.

  Therefore, as a result of research to avoid this problem, the inventors of the present invention have, as a lighting circuit means for a small high-pressure discharge lamp, a lighting circuit mainly composed of a small high-frequency inverter used in a bulb-type fluorescent lamp. Successfully used the means. Such a lighting circuit means generally has a simple circuit configuration and operates at a high frequency, so that it is light and inexpensive in addition to being small, so that the high pressure discharge lamp lighting device can be reduced in size, weight and cost. You can go down.

  However, if the starting voltage of the high-pressure discharge lamp can be further reduced, the lighting circuit means can be further reduced in size, and further reduced in weight and cost.

  Generally, the starting voltage of the 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 such as the electrodes and the discharge medium are constant.

  Therefore, in order to lower the starting voltage, it is common to reduce the pressure of the discharge medium and shorten the distance between the electrodes. This certainly reduces the starting voltage, but increases the sputtering and evaporation of tungsten that constitutes the electrode, blackening the translucent ceramic discharge vessel, reducing the luminous flux maintenance factor, and reducing the luminous efficiency. Cause problems.

  On the other hand, a proximity conductor may be provided as one of means for reducing the starting voltage. As this type of prior art, the end portion of one conductor wire is wound 2 to 3 turns on each of a pair of small diameter cylindrical portions provided in the translucent ceramic discharge vessel at a position close to the boundary with the surrounding portion. A structure is known in which the intermediate portion of the conducting wire is extended close to the surrounding portion. In addition, this conducting wire is not electrically connected to the electrode but is in a floating state.

  As another prior art, in one of a pair of long and narrow bar-shaped sealing portions provided in a translucent quartz discharge vessel, one end of a conducting wire is wound around the middle portion in the longitudinal direction for 2 to 3 turns, This is a structure in which the portion is placed along the surrounding portion with an interval, and the other end portion is connected to the external lead-in line on the other sealing portion side.

  However, it has been found that none of the above-described conventional techniques provided with proximity conductors is necessarily sufficient.

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

A high-pressure discharge lamp according to a first aspect of the present invention is a translucent ceramic discharge vessel having a surrounding portion surrounding a discharge space, 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 first and second elongated electrodes inserted into the small-diameter cylindrical portion while forming a slight gap between the inner surface of the small-diameter cylindrical portion of the photoceramic discharge vessel, and the translucent ceramic discharge vessel are enclosed. An arc tube provided with the discharge medium; and wound at least four turns so as to be in close contact with the outer surface of one small-diameter cylindrical portion through which the first electrode is inserted, and one end of which is at the same potential as the second electrode a first metallic coil that is connected such that, together with the second electrode are wound four turns or so closely to the outer surface of the small diameter cylinder portion of the other are inserted, one end first Connected to the same potential as the electrode A second metal coil; an arc tube and an outer tube containing the first and second metal coils in an airtight manner; connected to the first and second electrodes and airtightly led out from the outer tube to the outside A pair of external connection terminals; and a capacitance between the pair of external connection terminals is 1.2 to 4 pF.

A high pressure discharge lamp according to a second aspect of the present invention includes an enclosing portion surrounding a discharge space, a translucent ceramic discharge vessel having 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, The first and second elongated electrodes inserted into the small-diameter cylindrical portion while forming a slight gap between the inner surface of the small-diameter cylindrical portion of the photoceramic discharge vessel, and the translucent ceramic discharge vessel are enclosed. An arc tube provided with a discharge medium; connected to the outer periphery of one small-diameter cylindrical portion through which the first electrode is inserted for at least 4 turns and having one end at the same potential as the second electrode A first metal coil that is wound around the outer periphery of the other small-diameter cylindrical portion through which the second electrode is inserted, and at least one turn so that one end has the same potential as the first electrode. A second metal coil connected; An outer tube that hermetically houses the light tube and the first and second metal coils; a pair of external connection terminals that are connected to the first and second electrodes and are hermetically led out from the outer tube; And the discharge medium staying in a small gap in the small-diameter cylindrical portion is temporarily evaporated by glow discharge at the time of starting.

  In the present invention and each of the following inventions, the 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 includes at least a translucent ceramic discharge vessel, a pair of electrodes, and a discharge medium.

  <Translucent ceramic discharge vessel> “Translucent” means that the light generated by the discharge can be transmitted to the outside and transmitted to the outside. There may be. When the translucent ceramic discharge vessel has a small-diameter cylindrical part, it is sufficient that at least the surrounding part has translucency for the radiation to be used, and if necessary, radiation by a discharge such as a small-diameter cylindrical part. The portion that does not mainly lead out may be light-shielding.

  Therefore, the “translucent ceramic discharge vessel” means that at least the surrounding portion has a single crystal metal oxide such as sapphire, a polycrystalline metal oxide such as translucent airtight aluminum oxide (alumina ceramic), yttrium-aluminum. -It means a discharge vessel made of a material having optical transparency and heat resistance such as garnet (YAG), yttrium oxide (YOX) and polycrystalline non-oxide such as aluminum nitride (AlN).

  In order to manufacture a translucent ceramic 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 hollow spherical part that forms the surrounding part and a small-diameter cylindrical body that is connected to both ends of the spherical part to form a small-diameter cylindrical part are preliminarily sintered separately and then joined together as necessary. It is also possible to form an integral translucent ceramic discharge vessel by sintering. Further, for example, a cylinder that forms the surrounding portion, a pair of end plates that are fitted and closed to both end faces of the cylinder, and a small-diameter cylindrical body that is fitted to the center hole of the end plate to form a small-diameter cylindrical portion, An integrated discharge vessel can also be formed by pre-sintering each separately, fitting them as required, and sintering the whole.

  Further, in the present invention, the inner volume of the translucent ceramic discharge vessel is not limited, but in order to obtain a small high-pressure discharge lamp, the translucent ceramic discharge vessel is preferably 0.05 cc or less, preferably It is good to make it 0.04cc or less. In this case, the translucent ceramic discharge vessel has a total length of 35 mm or less, preferably 10 to 30 mm.

  <Regarding First and Second Electrodes> The first and second electrodes are sealed in a light-transmitting 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 ceramic discharge vessel, and the tip is located in the enclosure, or the tip is also located in the small-diameter cylinder, but the enclosure is in a desired position. It may be arranged so as to form a discharge in the surrounding portion.

  Each of the first and second electrodes is elongated, and a small gap called a capillary is formed between the first electrode and the second electrode and the inner surface of the small-diameter cylindrical portion. ing. In this case, it is desirable that the intermediate portion of the electrode has a constant thickness in order to form a uniform gap as small as possible between the inner surface of the small-diameter cylindrical portion of the translucent ceramic discharge vessel.

  Further, the tip portions of the first and second electrodes can be wound with a tungsten coil as necessary in order to increase the surface area and improve heat dissipation.

  Furthermore, the base end portions of the first and second electrodes function to fix current at a required position with respect to the translucent ceramic discharge vessel and to introduce current from the outside.

  Furthermore, the proximal end portions of the first and second electrodes can be electrically and mechanically supported by being fixed to the distal end of the power supply conductor by welding or the like. In this case, if necessary, the power supply conductor is allowed to be provided with a member such as molybdenum or cermet interposed between the base end of the electrode and the refractory portion when the base end of the electrode is fixed.

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

  Further, the discharge medium contains a light emitting substance or a compound thereof, such as a metal halide or amalgam.

  Furthermore, the discharge medium can contain mercury as buffer vapor.

  On the other hand, the rare gas is not essentially limited to a specific gas, but when required, such as when it is desired to reduce the glow current when transitioning from normal glow discharge to abnormal glow discharge, or to lower the discharge start voltage, Neon and argon can be mixed and sealed. In this case, argon can be mixed in a range of 0.1 to 15%, preferably up to 10% in partial pressure with respect to neon. Neon and argon can generally be used at a sealing pressure of 80 to 500 Torr, preferably 100 to 200 Torr. If the sealing pressure is less than 80 Torr, the glow-arc transition time becomes long, and blackening due to sputtering or evaporation of the electrode material tungsten increases. On the other hand, when the sealed 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 sealed as required.

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

  The metal halide of the luminescent metal obtains radiation having desired luminescent properties with respect to luminescent color, average color rendering index Ra, luminescent efficiency, etc., and further, depending on the size of the translucent ceramic discharge vessel and the lamp power, Any desired selection from known metal halides can be made. For example, one or a plurality of halides selected from the group consisting of sodium Na, lithium Li, scandium Sc, and a rare earth metal can be used.

  Further, instead of an appropriate amount of mercury as the buffer vapor, a halide such as aluminum such as aluminum, which has a relatively high vapor pressure and emits little light in the visible light region or does not emit light, can also be enclosed.

  <Other configuration of arc tube>

  1. Regarding the power supply conductor: A suitable structure for supporting the electrode and supplying power to the electrode and sealing the translucent ceramic discharge vessel is to use the power supply conductor described below.

  That is, the power supply conductor is a conductor that supports the electrodes, applies a voltage between the electrodes, supplies a discharge current to the electrodes, and functions to seal the translucent ceramic discharge vessel, and the tip is directly or later described. It connects with the base end part of an electrode through the attached refractory part which is attached, and the base end is derived | led-out outside the translucent discharge vessel. Note that “derived to the outside of the translucent discharge vessel” may or may not protrude from the translucent discharge vessel, but it may not protrude from the outside via the connection conductor. It means that it faces the outside to the extent that it can supply power.

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

  Furthermore, a sealing metal such as niobium, tantalum, titanium, zirconium, hafnium, and vanadium can be used for the power supply conductor. When alumina ceramic is used as the material of the translucent ceramic discharge vessel, niobium and tantalum are suitable for the power supply conductor because the average thermal expansion coefficient is almost the same as that of the alumina ceramic. The difference is also small in the case of yttrium oxide and YAG. When aluminum nitride is used for the translucent ceramic discharge vessel, it is preferable to use zirconium for the power supply conductor.

  Furthermore, the power supply conductor can be constituted by the metal rod-like body, pipe-like body, coil-like body, or the like. In this case, niobium or the like is an oxidizing metal. Therefore, when the high pressure discharge lamp is lit in the atmosphere, an oxidation-resistant external lead wire is further connected to the power supply conductor, and the power supply conductor does not contact the atmosphere. For example, it is necessary to cover the whole with a seal or the like.

  Furthermore, as described above, a refractory portion made of a refractory metal can be added to the tip of the power supply conductor. For the refractory portion, molybdenum, tungsten, cermet or the like can be used. However, if necessary, the proximal end of the electrode may be directly connected to the distal end of the sealing portion of the feeding conductor. This means that the refractory portion can be used as an electrode if at least the tip portion of the refractory portion added to the power supply conductor is made of tungsten. On the contrary, the base end portion of the electrode can be used as a refractory portion, and both are substantially the same.

  2. Regarding the lamp power: The lamp power of the high-pressure discharge lamp is not particularly limited. The “lamp power” refers to the power consumed by the high pressure discharge lamp when the high pressure discharge lamp is stably lit when the high pressure discharge lamp is connected to the lighting circuit means.

  [Regarding First and Second Metal Coils] The first metal coil is wound around the outer periphery of one small-diameter cylindrical portion of the translucent ceramic discharge vessel through which the first electrode is inserted. Further, the first metal coil is connected so that one end thereof has the same potential as the second electrode.

  Similarly, the second metal coil is wound around the outer periphery of the other small-diameter cylindrical portion in the translucent ceramic discharge vessel through which the second electrode is inserted. Further, the second metal coil is connected so that one end thereof has the same potential as the first electrode.

  Therefore, a high voltage is applied between the first and second metal coils and the first and second electrodes facing the first and second metal coils at the time of starting. Note that one end of the first and second metal coils are connected so as to have the same potential as the first and second electrodes because the metal coils face each other through the small-diameter cylindrical portion. When one electrode is used as one electrode, it means that one end of the metal coil is connected to a feeding conductor connected to the other electrode or a connecting conductor connected to the other.

  Further, the first and second metal coils are preferably wound so as to be as close as possible to the outer surface of the small-diameter cylindrical portion.

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

The present invention defines the effective number of turns of the metal coil. That is, the action of the metal coil is affected by the number of turns. If the number of turns is less than 4 turns, a sufficient effect of lowering the starting voltage cannot be obtained. The reason is not necessarily detailed, but it is estimated that the capacitance is related. In that sense, it is desirable that the metal coil is wound so that there is as little gap as possible on the surface of the small diameter cylindrical portion.

On the other hand, the upper limit of the number of turns of the metal coil is determined by the axial size of the translucent ceramic discharge vessel.

Therefore, the appropriate number of turns of the metal coil can be set so that a desired starting voltage can be obtained within a range that can be wound around the outer periphery of the small-diameter cylindrical portion. The present invention is also effective when the main aim is to adjust the glow-arc transition time at the start so as to fall within a desired range.

  [Outer tube] The outer tube is a means for accommodating the arc tube in an airtight manner. In the high-pressure discharge lamp of the present invention, a translucent ceramic discharge vessel is hermetically accommodated in an outer tube in order to keep warm and to cut off from the atmosphere. In order to achieve this, the outer tube can be evacuated and filled with vacuum or low pressure or inert gas such as noble gas or nitrogen.

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

  Furthermore, the outer tube can employ either a single-sided seal or a double-sided sealed structure as desired. However, when the outer tube has a one-sided sealing structure, it is preferable to make the axis of the high-pressure discharge lamp coincide with the optical axis when a reflecting mirror is used.

  Furthermore, a known seal structure such as a pinch seal, flare seal, bead seal, or button stem seal can be employed for sealing the outer tube.

  [Regarding a pair of external connection terminals] The pair of external connection terminals are connected to a pair of electrodes of the arc tube accommodated in the outer tube, and are led out from the outer tube to the outside and are supplied with electric energy from the external lighting circuit means. Functions as a connecting means for introducing the high pressure discharge lamp and, if necessary, as a means for supporting the high pressure discharge lamp.

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

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

  Furthermore, the external connection terminal may protrude outward from the outer tube, or may be attached around the outer tube. In the aspect which protrudes outward from an outer tube | pipe, the protrusion part may comprise a connection pin as it is, and the structure which functions as a connection line to a nozzle | cap | die may be sufficient. On the other hand, in a mode of being attached to the periphery of the outer tube, a so-called baseless structure is obtained if a portion of the attached outer tube is used as a pinch seal portion.

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

  [Other configurations]

  1. Regarding the connection conductor: In order to apply a starting voltage to the arc tube and supply a discharge current, a connection conductor interposed between the first and second electrodes of the arc tube and the external connection terminal in the outer tube is used. it can.

  As the connection conductor, a heat-resistant conductive metal such as molybdenum or niobium can be used.

2. Regarding support of arc tube: The arc tube can be supported at a predetermined position in the outer tube by any of the following modes.
(1) The arc tube is supported only by the connection conductor.
(2) A support frame that contacts the inner wall of the outer tube is attached to the connection conductor that supports the arc tube.
(3) The connecting conductor is bent and brought into contact with the inner wall of the outer tube.
(4) The connection conductor connected to the arc tube is engaged with the inner surface of the tip-off portion of the outer tube directly or indirectly through another member.
(5) Instead of the connection conductor, the translucent ceramic discharge vessel of the arc tube is directly supported by, for example, an elastic support band.

  3. Regarding the power receiving means: In order to connect the high-pressure discharge lamp to the lighting circuit means, a power receiving means can be provided in the outer tube. As power receiving means, means such as bases used for various lamps, hook ceiling caps used for powering ceiling lighting fixtures, insulation coated electric wires for directly connecting the high-frequency output end of lighting circuit means Can be appropriately selected and employed.

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

  As the base, any of the existing base types such as a screw base, a pin base, and a bayonet base can be adopted as desired. However, since a small high-pressure discharge lamp with a lamp power of 50 W or less can be configured to be a substitute for a halogen bulb, the E11 type screw cap that is the same as a halogen bulb for commercial power supply voltage can be used if necessary.

  Thus, by disposing the base at one end of the outer tube, the high-pressure discharge lamp can be easily and easily attached and detached by attaching it to the lamp socket. Therefore, an alternative to a halogen bulb is possible.

  4). About the getter: In order to adsorb the impure gas in the outer tube, the getter can be arranged in the outer tube as is generally done. In this case, the getter can be supported by an appropriate member such as a translucent ceramic discharge vessel or a connection conductor.

[Regarding the Action of the Present Invention] In the present invention, the first and second metal coils are wound around the outer periphery of one and the other small-diameter cylindrical portions of the translucent ceramic discharge vessel, respectively, by four turns or more . At the time of start-up, a relatively high voltage at the time of start-up is between the first and second electrodes and the first and second metal coils wound around the outer periphery of the pair of small-diameter cylindrical portions opposed to the first and second electrodes. Since these are respectively applied, a micro discharge is generated between them through the ceramic of the small-diameter cylindrical portion to assist the start-up. As a result, the starting voltage is significantly reduced. Further, since the first and second metal coils face each other in the vicinity of the interface of the discharge medium, evaporation of the discharge medium is promoted at the time of starting.

  As a result, according to the present invention, the starting voltage is further reduced as compared with the configuration in which the metal coil is wound so as to face only one of the electrodes.

In addition, since the first and second metal coils are disposed, electrical energy bypass due to minute discharge occurs, so that the first and second metal coils facing the first and second metal coils are disposed. The glow-arc transition time at the two electrodes tends to be stretched compared to when there is no metal coil, and is therefore effective for optimizing the glow-arc transition time, thereby Blackening at the start can also be suppressed. In addition, the first and second electrodes, the first and second metallic coil by being wound in each of the corresponding and well-balanced optimize glow-arc transition time for each electrode It is effective against that. For this reason, the glow-arc transition times of the respective electrodes are easily aligned, and blackening at start-up can be further suppressed.

  In the high-pressure discharge lamp according to the first aspect of the present invention, the capacitance between the pair of external connection terminals is 1.2 to 4 pF, and the electrostatic capacitance between the pair of external connection terminals suitable for reducing the starting voltage. The capacity is specified. The capacitance between the pair of external connection terminals is measured at a frequency of 40 kHz in a mode in which the high-pressure discharge lamp includes an outer tube and a metal coil, and the base is removed. The inside of the outer tube is allowed to be in a low vacuum state of about 10 −4 Torr.

Then, in the present invention, in that it comprises a metallic coil, opposed by the electrostatic capacity between the pair of external connection terminals is increased, through the ceramic of the small diameter tubular portion electrode and the thereto at start A small electric discharge is generated between the metal coil and the starting coil to accelerate the starting. This significantly reduces the starting voltage.

  In addition, since electric energy is bypassed through the capacitance during start-up and is no longer applied to the electrode, the glow-arc transition time can be extended appropriately and within the required range. Can be effectively suppressed.

  Furthermore, even when the metal coil is not connected to the other electrode, the capacitance between the external connection terminals increases.

  In the high pressure discharge lamp according to the second aspect of the invention, the first and second electrodes are inserted into the pair of small-diameter cylindrical portions through a slight gap, and stable lighting is provided in the small gap. Sometimes the discharge medium stays in the liquid phase, and the temperature of the staying discharge medium, that is, the interface becomes the coldest part temperature of the high-pressure discharge lamp, and the vapor pressure of the discharge medium is determined. On the other hand, in glow discharge at start-up, the discharge medium staying in a slight gap temporarily evaporates. And at the time of starting, it is desirable that evaporation of the discharge medium is performed within an appropriate time. Further, since the first and second metal coils are opposed to each other in the vicinity of the interface of the discharge medium, evaporation of the discharge medium is promoted at the start, and startability is improved.

The high pressure discharge lamp of the invention of claim 3 is the high pressure discharge lamp of claim 1 or 2 , wherein one end of the metal coil is located in the vicinity of the boundary with the surrounding portion of the translucent ceramic discharge vessel. It is a feature.

  The present invention defines a suitable arrangement position of the metal coil. That is, when one end of the metal coil is positioned in the vicinity of the boundary with the surrounding portion, the metal coil can be easily positioned and the metal coil can be easily placed. It is also possible to design the high pressure discharge lamp so that the interface of the discharge medium faces the metal coil.

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 metal coil has a winding pitch that is a ratio of a distance between the centers of a pair of adjacent turns to the diameter thereof. The winding pitch is 100 to 500%.

  The present invention defines a suitable winding pitch for the metal coil. The “winding pitch” is a numerical value representing the ratio of the distance between the centers of a pair of adjacent turns of the coil to the diameter of the metal wire in%. Therefore, when the winding pitch is 100%, the coil is closely wound. When the winding pitch is 500%, a gap equal to four times the diameter of the metal wire forming the coil is formed between the turns.

  In the present invention, when the winding pitch exceeds 500%, it is somewhat difficult to wind the coil with as little gap as possible with respect to the outer surface of the small-diameter cylindrical portion and without rewinding. Further, even if the winding pitch is 100% and contact is made between adjacent turns, there is no particular problem.

  Thus, in the present invention, the metal coil can be easily wound and the starting voltage can be effectively reduced.

The high-pressure discharge lamp according to claim 5 is the high-pressure discharge lamp according to any one of claims 1 to 4 , wherein the length of the metal coil is L1, and the small-diameter cylindrical portion of the translucent ceramic discharge vessel is provided. When the length is L2, L1 / L2 is 0.3 to 1.0.

  The present invention defines a preferred length L1 in the axial direction of the metal coil relative to the length L2 in the longitudinal direction of the small diameter cylindrical portion. That is, the metal coil can be wound over the entire length of the small diameter cylindrical portion. In the shortest case, it may be 0.3 times as long as the small-diameter cylindrical portion.

A high-pressure discharge lamp according to a sixth aspect of the invention is the high-pressure discharge lamp according to any one of the first to fifth aspects, wherein the metal coil is an end located on a side opposite to the surrounding portion of the translucent ceramic discharge vessel. Is connected so as to have the same potential as the electrode on the opposite side.

  The present invention defines a preferred choice of the end that connects to the electrode of the metal coil. That is, by connecting the end located on the side opposite to the surrounding portion to the electrode, the influence of the connection portion of the metal coil on the light distribution of the high-pressure discharge lamp can be reduced. In addition, when the metal coil is connected to the electrode, the surrounding portion of the translucent ceramic discharge vessel is unlikely to get in the way, so that the connection workability is good.

A high-pressure discharge lamp according to a seventh aspect of the invention is the high-pressure discharge lamp according to any one of the first to sixth aspects, wherein the electrode is wound around the shaft at a position at least partially facing the metal coil. It is characterized by having a metal coil body.

  The wire diameter, the number of turns, and the winding pitch are not limited on the assumption that the metal coil body can be disposed inside the small-diameter cylindrical portion of the translucent ceramic discharge vessel. In addition, the discharge medium enters and exits through the gap formed between the metal coil body and the small-diameter cylindrical portion, whereas the slight gap formed from the metal coil body to the end of the small-diameter cylindrical portion, and during lighting It stays in the liquid phase within a small gap.

  Thus, in the present invention, the starting voltage is further reduced by disposing the metal coil body on the shaft portion 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 since the facing area between the metal coil located outside the small-diameter cylindrical portion is increased and the gap length between the two is reduced, the electrostatic capacity between the two is reduced. It is estimated that the capacity increases.

  Furthermore, 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 a slight gap is large.

A high-pressure discharge lamp lighting device according to an eighth aspect of the present invention includes: the high-pressure discharge lamp according to any one of the first to seventh aspects; and an inverter as a main component, the high-pressure discharge lamp having a glow-arc transition time of 0.5 to And a lighting circuit means for high-frequency lighting so as to be 3.0 seconds.

  [Regarding Arrangement of High-Pressure Discharge Lamp and Lighting Circuit Means] In the present invention, the high-pressure discharge lamp and the lighting circuit means may be connected on an electric circuit, and therefore they are arranged spatially separated from each other. Alternatively, they may be arranged to be lit in a state where they are mechanically coupled to each other. For example, an example of the former arrangement is a mode in which the high-pressure discharge lamp is mounted on the lighting fixture, but the lighting circuit means is arranged away from the lighting fixture such as the ceiling. Moreover, the example of the latter arrangement | positioning is an aspect which comprises the lightbulb-type high pressure discharge lamp mentioned later.

  [Lighting circuit means] In the present invention, "high frequency" means a frequency of 5 kHz or more. In order to reduce the size of the lighting circuit means, a lighting circuit means for a fluorescent lamp can be used. The lighting circuit means for the fluorescent lamp has a continuous load characteristic from the secondary open circuit voltage to the secondary short circuit current.

  In the present invention, lighting circuit means manufactured for a fluorescent lamp can be used. However, it goes without saying that the lighting circuit means designed and manufactured to satisfy the above load characteristics for a high-pressure discharge lamp can be used.

  Moreover, in this invention, the secondary open circuit voltage V20 of a lighting circuit means can be set in the range with a comparatively large freedom degree. That is, generally, the ratio V20 / Vs (%) of the secondary open circuit voltage V20 of the lighting circuit means to the discharge start voltage Vs of the high-pressure discharge lamp can be set in the following range.

                            110 ≦ V20 / Vs ≦ 300

  Since the discharge start voltage Vs of the high-pressure discharge lamp varies statistically, it is necessary to pay sufficient attention to its specification.

  By the way, the basic circuit configuration of the lighting circuit means may be any as long as it has the load characteristics as described above.

  The operating frequency of the lighting circuit means can be in the range of 5 to 200 kHz.

  A lighting circuit means mainly composed of a high-frequency inverter provided with an LC resonance circuit can be used.

  As an inverter that satisfies the above conditions, a half-bridge inverter, a one-stone inverter, such as a blocking oscillation inverter, a parallel inverter, or the like can be used. Further, the oscillation control of the inverter may be either self-excited or separately excited. Further, the oscillation frequency of the inverter may be constant or variable.

  In the case of changing the operating frequency of the inverter with respect to the resonant frequency of the LC resonant circuit 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 brought closer to the resonant frequency of the LC resonant circuit at the time of starting, the output voltage becomes higher, and the secondary open circuit voltage can be brought closer to the discharge start voltage of the high-pressure discharge lamp. On the contrary, if the operating frequency is separated from the resonance frequency after 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 with the secondary open voltage approaching the discharge start voltage of the high-pressure discharge lamp.

In the case where the operating frequency is constant, the output voltage of the lighting circuit means can be controlled by configuring the LC resonant circuit so that the resonant frequency changes according to the situation. That is, the inductor L of the LC resonance circuit is saturated and its inductance is reduced when there is no load, and the resonance frequency is increased to approach the operating frequency, so that the output voltage of the lighting circuit means is increased. In addition, when the load is applied, the inductor of the LC resonance circuit is not saturated in accordance with the lamp current, and the resonance frequency moves away from the operating frequency, and the output voltage is reduced accordingly.

  Thus, by using an inverter provided with 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 high-pressure discharge lamp so that the glow-arc transition time is in the range of 0.5 to 3.0 seconds, preferably 1.0 to 2.5 seconds, When the lighting circuit means is lit, the blackening at the start can be remarkably reduced.

  The glow-arc transition time is obtained by measuring the drop point of the lamp voltage waveform with an oscilloscope and calculating the average value of five measurements. The drop point of the ramp voltage waveform must be the drop point when both electrodes undergo a glow-arc transition. Therefore, not only does a pair of electrodes simultaneously undergo a glow-arc transition, but when there is a time lag, this is a lowering point for an electrode that undergoes a glow-arc transition later.

  By the way, if the glow-arc transition time is less than 0.5 seconds, a large amount of glow-arc transition power is input in a short period of time, and excessive heating of the electrode is performed. Is excessively performed, and therefore, blackening is promoted and the luminous flux maintenance factor is excessively lowered.

Also, if the glow-arc transition time exceeds 3.0 seconds, the glow-arc transition time becomes longer, so that the sputtering of the electrode becomes conspicuous, promoting blackening at the start, and the luminous flux maintenance factor is increased. Since it falls, it is impossible.

  Thus, if the glow-arc transition time is in the range of 0.5 to 3.0 seconds, it is possible to ensure a luminous flux maintenance rate of 80% or more after 3000 hours of lighting. In addition, the said lighting time is the time which implemented the blink cycle test of lighting a high pressure discharge lamp for 165 minutes, and extinguishing for 15 minutes.

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

A lighting device according to a ninth aspect of the present invention includes: a lighting device main body; and the high-pressure discharge lamp lighting device according to the eighth aspect disposed in the lighting device main body.

  In the present invention, the lighting device is a broad concept including all devices that use the light emission of the 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 fixture, a moving body headlamp, an optical fiber light source device, an image projection device, a photochemical device, a fingerprint discrimination device, and the like.

  The “illuminating device main body” refers to the remaining part of the illuminating device excluding the high-pressure discharge lamp. In addition, the “bulb-type high-pressure discharge lamp” is a combination of a high-pressure discharge lamp and its lighting circuit means, and a base for receiving power, and is attached to a lamp socket that is suitable for the base. It means an illuminating device configured to be used as if a light bulb is turned on. Furthermore, the lighting circuit means of the high-pressure discharge lamp lighting device may be disposed in the lighting device main body, or may be disposed at a position separated from this, for example, on the back of the ceiling.

  Next, when a bulb-type high-pressure discharge lamp is configured, a reflecting mirror for condensing light emitted from the high-pressure discharge lamp can be provided so as to obtain a desired light distribution characteristic. Moreover, in order to reduce the high brightness | luminance of a high pressure discharge lamp, it can replace with a reflective mirror, and can provide the glove | globe or cover which has a moderate light-diffusion effect | action in addition to this. Furthermore, the thing of a desired specification can be used for a nozzle | cap | die. Therefore, for the purpose of replacing the conventional light source lamp, the same base as that of the conventional light source lamp may be adopted.

  By the way, when the illuminating device is a luminaire, the illuminating device main body is provided with a lighting circuit means and a lamp socket, and the high pressure discharge lamp can be mounted on the lamp socket. However, a configuration in which the lighting circuit means is not provided and the bulb-type high-pressure discharge lamp is mounted on the lamp socket as a light source may be used.

According to each of the first to eighth aspects of the present invention, the outer periphery of the translucent ceramic discharge vessel, the arc tube provided with the first and second electrodes and the discharge medium, and the pair of small diameter cylindrical portions of the translucent ceramic discharge vessel 4 turns are more wound, and first and second metallic coil connected at one end to the opposite side of the electrode at the same potential, and an outer tube for accommodating them in an airtight, light-emitting tube By providing a pair of external connection terminals that are connected to electrodes and the like and are airtightly led out from the outer tube to the outside, the starting voltage is further sufficiently reduced, and the lighting circuit means can be reduced in size. In addition, it is possible to provide a high-pressure discharge lamp that is effective in extending the glow-arc transition time.

  According to the first aspect of the present invention, since the capacitance between the pair of external connection terminals is 1.2 to 4.0 pF, the starting voltage is reduced and the glow-arc transition time is effectively extended. High pressure discharge lamps can be provided.

  According to the invention of claim 2, in addition, the startability can be improved by temporarily evaporating the discharge medium staying in a small gap in the small-diameter cylindrical portion by glow discharge at the start.

According to the invention of claim 3 , in addition, since the one end of the metal coil is positioned in the vicinity of the boundary with the surrounding portion of the translucent ceramic discharge vessel, the positioning of the metal coil is easy and the stationary It is possible to provide a high-pressure discharge lamp that is easy to perform.

According to the invention of claim 4 , in addition, the winding pitch of the metal coil is 100 to 500%, so that a high-pressure discharge lamp that is easy to wind and effective against a decrease in starting voltage is obtained. Can be provided.

According to the invention of claim 5, in addition by the ratio L1 / L2 of the total length L1 of the metal coil to the length L2 of the small-diameter cylindrical portion is 0.3 to 1.0, a is a suitable long metal coil A high-pressure discharge lamp provided with the above can be provided.

According to the sixth aspect of the present invention, in addition, the end on the opposite side of the surrounding portion of the metal coil is connected to the other electrode side. A high-pressure discharge lamp that can be easily connected can be provided.

According to the seventh aspect of the present invention, in addition, the electrode has a metal coil body wound around the shaft at a position at least partially facing the metal coil, so that the starting voltage is reduced. In addition, a high pressure discharge lamp capable of controlling the glow-arc transition time can be provided.

According to invention of Claim 8, the high pressure discharge lamp lighting device which has the effect of Claims 1 thru | or 7 can be provided.

According to invention of Claim 9, the illuminating device which has the effect of Claims 1 thru | or 8 can be provided.

  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 a high-pressure discharge lamp according to the present invention.

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

  FIG. 3 is a partially sectional front view showing a wire valve state before the base is similarly mounted. In each figure, the high-pressure discharge lamp includes an arc tube IB, a first connection conductor CC1, a second connection conductor CC2, first and second metal coils CO1, CO2, an outer tube OB, and a pair of external connection terminals OCT1. , OCT2, getter GT, and base B.

  <About the arc tube IB> The arc tube IB includes a translucent ceramic discharge vessel 1, first and second electrodes 2A and 2B, an introduction conductor 3, a seal 4 and a staying discharge medium 5, and is vertically symmetrical. Structure.

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

  Each of the first and second electrodes 2A, 2B is made of doped tungsten, and includes a shaft portion 2a and a coil portion 2b that are formed in a rod shape. The shaft portion 2a has a tip protruding into the surrounding portion 1a and inserted into the small diameter cylindrical portion 1b, and a slight gap g is formed between the small diameter cylindrical portion 1b and the first and second electrodes 2A and 2B. Is formed. The coil part 2b is attached to the tip of the shaft part 2a.

  The introduction conductor 3 is made of niobium and has a rod shape. The distal end of the introduction conductor 3 abuts against the proximal end portions of the electrodes 2A and 2B and is discharge welded, and the proximal end protrudes outside the translucent ceramic discharge vessel 1.

  As shown in FIG. 2, the seal 4 is formed by melting and solidifying a ceramic sealing compound, so that the small-diameter cylindrical portion 1b of the translucent ceramic discharge vessel 1, the tip of the introduction conductor 3, and each electrode 2A, The transparent ceramic discharge vessel 1 is hermetically sealed by being interposed between the base end portion of the shaft portion 2a of 2B, and the introduction conductor 3 is covered so as not to be exposed to the inside of the transparent ceramic discharge vessel 1. is doing. Moreover, the electrodes 2A and 2B are fixed at predetermined positions by this sealing.

  In order to form the seal 4, the translucent ceramic discharge vessel 1 is set in a vertical position, and the ceramic sealing compound is applied to the end surface of the small-diameter cylindrical portion 1 b around the portion protruding from the introduction conductor 3. And is heated and melted to enter the gap between the introduction conductor 3 and the inner surface of the small-diameter cylindrical portion 1b to cover the entire introduction conductor 3 inserted into the small-diameter cylindrical portion 1b. The base end portion of this is also covered and solidified by cooling.

  The discharge medium is composed of a starting gas and 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 encapsulated in excess of the amount that evaporates, as shown in FIG. 2, a part 5 of the metal halide and mercury stays in a small gap g during stable lighting. The interface of the discharge medium 5 forms the coldest part.

  <Regarding the first and second connection conductors CC1 and CC2> The first connection conductor CC1 is made of molybdenum wire, the tip thereof is connected to the power supply conductor 3 on the electrode 2A side, and the middle is the translucent ceramic discharge vessel 1. Are substantially parallel to and spaced apart from each other in the axial direction.

  As shown in FIG. 3, the second connection conductor CC2 is made of molybdenum, and the tip thereof is connected to the power supply conductor 3 on the electrode 2B side.

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

  The second metal coil CO2 is wound around the outer periphery of the small-diameter cylindrical portion 1b through which the second electrode 2B is inserted, and the terminal on the power supply conductor 3 side is the first connection conductor CC1. Connected to.

  <About the outer tube OB> The outer tube OB is made of a hard glass T-shaped bulb. A pinch seal part ps is formed at the base end, and an exhaust tip-off part t is formed at the tip. It is in a low vacuum state of about 4 Torr. The pinch seal part ps is formed by pinching when the open end of the T-shaped valve is heated and softened. The exhaust tip-off part t is a trace of the exhaust pipe (not shown) sealed by exhausting the inside of the outer pipe OB after sealing the outer pipe OB.

  <Regarding the Pair of External Connection Terminals OCT1, OCT2> As shown in FIG. 3, the pair of external connection terminals OCT1, OCT2 is formed integrally with the first and second connection conductors CC1, CC2, Before mounting the base B as the power receiving means, it protrudes outward from the outer tube OB.

  <About Getter GT> The getter GT is made of a ZrAl alloy and is supported on the first connection conductor CC1 by welding.

  <About the base B> The base b is made of an E11 screw base, and a pair of external connection terminals OCT1 and OCT2 are connected as required, and fixed to the pinch seal portion ps of the outer tube OB by an inorganic adhesive (not shown). Has been.

  The high-pressure discharge lamp shown in FIGS. 1 to 3 has the following specifications.

  <Luminescent tube>

  Translucent ceramic discharge vessel: made of translucent alumina ceramics, with a total length of 23 mm, an outer diameter of the surrounding portion 1a of 6 mm, an inner diameter of 5 mm (thickness of 0.5 mm), a small-diameter cylindrical portion 1b of an outer diameter of 1.7 mm, an inner diameter of 0 .7mm (thickness 0.5mm), length L2 is 8mm

  Electrode: Tungsten with a diameter of 0.2 mm for the shaft and coil

  Introduced conductor: Niobium, diameter 0.64mm

  Slight gap g: 0.25mm

  Discharge medium: Ne 3% + Ar 200 Torr as starter gas and buffer gas, other appropriate amount of mercury and luminescent metal halide (the luminescent metal halide does not evaporate completely during lighting, with a little excess Enclosed in such an amount that it stays inside.)

  First and second metal coils: A molybdenum wire having a diameter of 0.3 mm is wound with a winding pitch of 200% for 7 turns, and is wound in close contact with the outer periphery of the small-diameter cylindrical portion from the position adjacent to the surrounding portion, and the total length L1 Is about 5 mm, (L1 / L2) ≈0.63

  Capacitance between a pair of external connection terminals: 2.3 pF

  Starting voltage: 0.7 kVp-p (The starting voltage was 3.0 kVp-p in the case of the comparative example having the same specifications as the present embodiment except that the first and second metal coils were not provided. .)

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

  FIG. 4 is a partial cross-sectional front view showing a first modified example related to the high-pressure discharge lamp of the present invention. In the figure, the same parts as those in FIG. This modification is different in that the first metal coil CO1 is not connected to the second electrode 2B. That is, the first metal coil CO1 is in a conductively floating state.

  Thus, the starting voltage was 1.0 kVp-p. The glow-arc transition time of the first electrode 2A was 0.7 seconds, and the glow-arc transition time of the second electrode 2B was 1.5 seconds. Furthermore, the capacitance between the external connection terminals OCT1 and OCT2 is approximately 1.8 to 2.0 pF.

  FIG. 5 is a partial sectional front view showing a second modified example related to the high pressure discharge lamp of the present invention. In the figure, the same parts as those in FIG. This modification is different in that only the second metal coil CO2 is wound.

  The starting voltage was 1.1 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.

  Furthermore, the capacitance between the external connection terminals OCT1 and OCT2 is approximately 1.3 to 1.8 pF.

FIG. 6 is an enlarged cross-sectional front view of an essential part showing a second embodiment of the high-pressure discharge lamp of the present invention. In the figure, the same parts as those in FIG. This embodiment includes metal coil bodies MC1 and MC2 wound around the shaft portion 2a of the electrodes 2A and 2B at portions facing the metal coils CO1 and CO2 of the shaft portions 2a of the electrodes 2A and 2B. . That is, the metal coil bodies MC1 and MC2 are formed by winding a tungsten wire having a diameter of 0.2 mm around the shaft portion 2a for 8 turns. Therefore, a gap of 0.05 mm is formed between the metal coil bodies CO1 and CO2 and the inner surface of the small diameter cylindrical portion 1b, and a spiral gap is also formed between the turns of the metal coil bodies CO1 and CO2.

FIG. 7 is a circuit diagram showing lighting circuit means of one embodiment in the high pressure discharge lamp lighting device of the present invention. In the figure, 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 first switching means, Q2 is second switching means, GD is a gate drive circuit, ST is a starting circuit, GP denotes a gate protection circuit, LC is the load circuit, c, d shows the insertion position of the receiving metal for connecting the high-pressure discharge lamp HPL.

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

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

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

  The rectified DC power source RD includes a bridge type rectifier circuit BR and a smoothing capacitor C2, and an AC input terminal of the bridge type rectifier circuit BR is connected to the low frequency AC power source AS via a noise filter NF and an overcurrent fuse f. The direct current output terminal is connected to both ends of the smoothing capacitor C2, and supplies the smoothed direct current.

  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 negative 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 thereof are connected between the output ends of the rectified DC power supply RD.

  The gate drive circuit GD includes a feedback circuit FBC, a series resonance circuit SOC, and a gate voltage output circuit GO. 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 is composed of a series circuit of an inductor L3 and a capacitor C3, and both ends thereof are connected to the feedback means FBC. The gate voltage output means GO is configured such that the resonance voltage appearing at both ends of the capacitor C3 of the series resonance circuit SOC is taken out 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 the gates of the first and second switching means Q1 and Q2. Furthermore, 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 resonant voltage appearing across 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, and R3. The resistor R1 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 a gate voltage output in the gate drive circuit GD. The output terminal on the gate side of the circuit GO, that is, the other end of the capacitor C4 is connected. The other end of the resistor R2 is connected to a connection point between the inductor L3 of the series resonant circuit SOC and the feedback circuit FBC. One end of the resistor R3 is 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 is connected to the minus side of the smoothing capacitor C2. is doing.

  The gate protection circuit GP includes a pair of Zener diodes connected in anti-series, and is connected in parallel to the series part of the gate voltage output circuit GO and the capacitor C3 of the series resonance circuit SOC.

  The load circuit LC includes a series circuit of a high-pressure discharge lamp HPL, 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 being a high-frequency output end c and the other end being Each is connected to the high frequency output terminal d. A lamp socket (not shown) is inserted into the high-frequency output terminals c and d, and the high-pressure discharge lamp HLP is connected to the lighting circuit means through the lamp socket.

  The high-pressure discharge lamp HPL has the configuration shown in FIGS.

  Current limiting inductor L2 and resonant capacitor C6 form a series resonant circuit. Note that the DC cut capacitor C5 has a large capacity and thus does not greatly affect the series resonance.

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

  Next, circuit operation will be described. When the AC power supply AS is turned on, a DC voltage smoothed by the rectified DC power supply RD appears at both ends of the smoothing capacitor C2. A DC voltage is applied between the drains of the first and second switching means Q1 and Q2 connected in series. However, both switching means Q1, Q2 are 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 corresponding to an appropriate proportion 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 applied as a positive voltage between the gate and source of the first and second switching means Q1, 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 an opposite polarity to the required gate voltage, and therefore remains off.

  When the first switching means Q1 is turned on, a current flows from the rectified DC power supply RD to the load circuit LC via the first switching means Q1. As a result, the series resonance circuit of the current limiting inductor L2 and the resonance capacitor C6 resonates, and 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 that is magnetically coupled. As a result, the series resonant circuit SOC resonates in series, and a boosted negative voltage is generated in the capacitor C3. Therefore, the 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. The switching means Q1 and Q2 are applied between the gate and source. As a result, the second switching means Q2 exceeds the threshold voltage and is turned on. On the other hand, the first switching means Q1, which has been turned on so far, is turned off because the gate voltage has a reverse polarity.

  When the second switching means Q2 is turned on, the electromagnetic energy stored in the current limiting inductor L2 of the load circuit LC and the charge of the capacitor C6 are released, and the load is supplied from the current limiting inductor L2 via the second switching means Q2. A current flows in the circuit LC in the reverse direction, and a high voltage due to resonance with reversed 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.

  By the way, before the high pressure discharge lamp HPL is started, the half-bridge type high frequency inverter operates at a frequency relatively close to the resonance frequency of the series resonance circuit formed by the current limiting inductor L2 and the capacitor C6. The secondary open circuit voltage is about 500 V (effective value), that is, about 1.0 kVp-p, and is set to a value higher than the starting voltage of the high-pressure discharge lamp HPL. The secondary short circuit current is about 550 mA.

Therefore, without using an igniter that generates a pulse voltage, the high-pressure discharge lamp HPL eventually starts, and a glow-arc transition is performed in about 1.4 seconds, and the position of the rated lamp current value on the load characteristic curve is Lights stably as an operating point. The high-pressure discharge lamp undergoes the transition within the glow-arc transition time, so that almost no blackening occurs at the start. Note that the operating frequency during lighting is 47 kHz .

  FIG. 8 is a partial central cross-sectional side view showing the spotlight as the first embodiment in the illumination device of the present invention. In the figure, 11 is a spotlight body, and 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 attachment part 11a is attached to the ceiling and suspends the spotlight, and is connected to lighting circuit means (not shown) disposed on the back of the ceiling and receives power from here. The base end of the arm 11b is fixed to the ceiling mounting portion 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 so as to be able to rise and fall within a vertical plane. In addition, the dashed-two dotted line in a figure has demonstrated the range which can adjust the elevation of the arm 11b when the main body case 11c is made into the reference | standard. The lamp socket 11d is suitable for the E11 type base, and is disposed in the main body case 11c. The reflecting mirror 11e is located in front of the lamp socket 11d and is disposed in the main body case 11c. The light shielding cylinder 11f is arranged at the center of the opening end of the reflecting mirror 11e. The front glass 11g is disposed at the opening end of the main body case 11c.

  The high-pressure discharge lamp 12 has the same specifications as shown in FIG. 1 to FIG. 3, and the same parts as those in FIG. The high-pressure discharge lamp 12 is attached to the spotlight body 11 by attaching its base B to the lamp socket 11d. Further, the light shielding cylinder 11f shields light from the tip of the outer tube OB in a state where the high pressure discharge lamp 12 is attached, thereby preventing glare.

  FIG. 9 is a cross-sectional front view of an essential part showing a bulb-type high-pressure discharge lamp as a second embodiment in the illumination device of the present invention. In the figure, the bulb-type high-pressure discharge lamp includes a high-pressure discharge lamp 12, a pedestal 13, a reflecting mirror 14, a lighting circuit means 15, a base 16, and a base 17. Hereinafter, description will be made for each component.

  [About the high-pressure discharge lamp 12] The high-pressure discharge lamp 12 has the same specifications as shown in FIG. 5 except for the cap portion, and the external connection terminals OCT1 and OCT2 protrude upward from the pinch seal portion ps of the outer tube OB in the drawing. ing. Note that the same parts as those in FIG.

  [About the pedestal 13] The pedestal 13 is formed by molding a heat-resistant synthetic resin, and has a mounting hole 13a at the center, an attachment portion 13b at the upper outer periphery in the figure, and an inverted cup shape in the hollow at the lower outer periphery. A skirt portion 13c is provided. The mounting hole 13a is used for mounting the high-pressure discharge lamp 12 and the reflecting mirror 14. The pinch seal portion ps of the high-pressure discharge lamp 12 inserted therein and an edge portion 14a of the reflecting mirror 14 described later are concentric and inorganic. It is fixed via an adhesive BC. The attachment 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 adjusts the appearance.

  [Reflecting Mirror 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 pedestal 13. In the present embodiment, as described above, it is fixed together with the high-pressure discharge lamp 12. The reflecting mirror 14 is formed in a thin shape by glass molding, and at the same time, a top cylindrical edge portion 14a is integrally formed, and a reflecting surface 14b made of an aluminum vapor deposition film is formed on the inner surface. . In addition, this edge part 14a is inserted in the mounting hole 13a of the base 13, and is being fixed to the base 13 with the inorganic adhesive BC. Further, a front glass 14 c is disposed in the opening of the reflecting mirror 14. That is, the front glass 14 c is manufactured by molding transparent glass, and is hermetically sealed with the low melting point frit glass 18 at the opening of the reflecting mirror 14. Furthermore, nitrogen is sealed as an inert gas in the internal space formed by the reflecting mirror 14 and the front glass 14b.

[About the 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. And connected as required. The lighting circuit unit 15 is the same circuit configuration as FIG.

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

  [About base 17]

  The base 17 is an E26 type base and is attached to the base of the base 16.

The partial cross section front view which shows 1st Embodiment in the high pressure discharge lamp of this invention Similarly enlarged cross-sectional front view Similarly, a partial cross-sectional front view showing the state of the wire valve before mounting the base The partial cross section front view which shows the 1st modification of the high pressure discharge lamp of this invention The partial cross section front view which shows the 2nd modification of the high pressure discharge lamp of this invention The expanded principal part sectional front view which shows 2nd Embodiment in the high pressure discharge lamp of this invention. The circuit diagram which shows the lighting circuit means of one Embodiment in the high pressure discharge lamp apparatus of this invention The partial center sectional side view which shows the spotlight as 1st Embodiment in the illuminating device of this invention The principal part cross-sectional front view which shows the lightbulb-type high pressure discharge lamp as 2nd Embodiment in the illuminating device of this invention.

Explanation of symbols

IB ... arc tube 1 ... translucent ceramic discharge vessel 1a ... enveloping part 1b ... small diameter cylindrical part 3 ... feeding conductor 4 ... seal CO2 ... first metal coil CO1 ... second metal coil OB ... outer tube ps ... Pinch seal part t ... Exhaust tip-off part CC1 ... First connection conductor GT ... Getter B ... Base

Claims (9)

An enclosing portion that surrounds the discharge space, a translucent ceramics discharge vessel that is disposed in communication with both ends of the enclosing portion and has a pair of small-diameter cylindrical portions having an inner diameter smaller than the enclosing portion, and an inner surface of the small-diameter cylindrical portion of the translucent ceramic discharge vessel An arc tube having a first and second elongated electrodes inserted into the small-diameter cylindrical part while forming a slight gap between the first and second electrodes, and a discharge medium sealed in a translucent ceramic discharge vessel;
The first electrode is wound with four or more turns so as to be in close contact with the outer surface of one small-diameter cylindrical portion through which the first electrode is inserted, and is connected so that one end has the same potential as the second electrode. A metal coil;
Together with a second electrode wound four turns or so closely to the outer surface of the small diameter cylinder portion of the other are inserted, one end a second connected to the same potential as the first electrode A metal coil;
An arc tube and an outer tube in which the first and second metal coils are hermetically housed;
A pair of external connection terminals connected to the first and second electrodes and led out from the outer tube to the outside;
And a capacitance between the pair of external connection terminals is 1.2 to 4 pF. An enclosing portion that surrounds the discharge space, a translucent ceramics discharge vessel that is disposed in communication with both ends of the enclosing portion and has a pair of small-diameter cylindrical portions having an inner diameter smaller than the enclosing portion, and an inner surface of the small-diameter cylindrical portion of the translucent ceramic discharge vessel An arc tube having a first and second elongated electrodes inserted into the small-diameter cylindrical part while forming a slight gap between the first and second electrodes, and a discharge medium sealed in a translucent ceramic discharge vessel;
A first metal coil wound around the outer periphery of one small-diameter cylindrical portion through which the first electrode is inserted for at least four turns and connected so that one end has the same potential as the second electrode; ;
A second metal coil wound around the outer periphery of the other small-diameter cylindrical portion through which the second electrode is inserted for at least four turns and connected so that one end has the same potential as the first electrode; ;
An arc tube and an outer tube in which the first and second metal coils are hermetically housed;
A pair of external connection terminals connected to the first and second electrodes and led out from the outer tube to the outside;
A high-pressure discharge lamp characterized in that a discharge medium staying in a small gap in the small-diameter cylindrical portion is temporarily evaporated by glow discharge at the time of starting. The high pressure discharge lamp according to claim 1 or 2 , wherein one end of the metal coil is located in the vicinity of the boundary with the surrounding portion of the translucent ceramic discharge vessel. Metal coil, when the pitch winding ratio of the distance between adjacent pair of the turn center to its diameter, one of the claims 1 to 3, characterized in that the winding pitch is 100 to 500% A high-pressure discharge lamp according to claim 1. When the length of the metal coil is L1, and the length of the small diameter cylindrical portion of the translucent ceramic discharge vessel is L2, L1 / L2 is 0.3 to 1.0. The high-pressure discharge lamp according to any one of claims 1 to 4 . Metal coil, and the surrounding portion of the light-transmissive ceramic discharge vessel of claim 1 to 5, characterized in that the end located on the opposite side are connected to the same potential as the opposite side of the electrode The high-pressure discharge lamp according to any one of the above. Electrodes, a high pressure according to any one of claims 1 to 6, characterized in that it comprises a metal coil body wound on the shank at a position facing at least partially the metal coil Discharge lamp. A high-pressure discharge lamp according to any one of claims 1 to 7 ;
A lighting circuit means which is mainly composed of an inverter and radiates a high-pressure discharge lamp at a high frequency so that a glow-arc transition time is 0.5 to 3.0 seconds;
A high-pressure discharge lamp lighting device comprising: A lighting device body;
A high-pressure discharge lamp lighting device according to claim 8, which is disposed in the lighting device body;
An illumination device comprising:

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