JP2007194063A - High-pressure discharge lamp and lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-pressure discharge lamp which has little decrease in total luminous flux, an improved effect of suppressing damage to an outer tube due to rupture of an arc tube by any chance, and little directivity of strength by improving reinforcing yarns disposed on the outer circumference of a shroud; and to provide a lighting device using the same. <P>SOLUTION: The high-pressure discharge lamp L is equipped with a transparent airtight vessel 40; the arc tube 4 having a rated lamp power of ≤400 W equipped with a pair of electrodes 5a, 5b, and a discharge medium containing at least a rare gas and a halide of a light emission metal; the shroud 6 surrounding the arc tube, a reinforcing body 63 composed of thermally resistant inorganic fiber yarns wound nearly closely on the outer circumference of the shroud, in the forward/reverse directions as a plurality of spiral turns with adjacent turns of the spiral turns wound in the same direction having a pitch L(mm) satisfying the expression 5≤L≤15; a support member 7 for the arc tube and the shroud; a starting circuit-constituted part 80; the outer tube 1; and a power supply member. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a shroud made of a heat-resistant and translucent member surrounding an arc tube, a high-pressure discharge lamp in which a reinforcing body for reinforcing the shroud is disposed in an outer tube, and a lighting fixture using the discharge lamp.

  High-pressure discharge lamps, such as metal halide lamps, are often used as light sources for illumination in stores, shopping streets, halls, sports facilities, and the like because they are compact, have high efficiency and high color rendering.

  In order to obtain high efficiency and high color rendering, the high pressure discharge lamp is made smaller in the arc tube to increase the temperature and prevent oxidation of metal parts. It has a sealed double pipe structure. However, this type of high-pressure discharge lamp rarely breaks the arc tube during lighting.

  Therefore, by covering the arc tube with a shroud, if the arc tube bursts and the fragments of the light-transmitting airtight container forming the arc tube are scattered, the shroud reduces the impact of the fragments reaching the outer tube In addition, a technique is known in which the fragments are prevented from flying directly to the outer tube and further damaging the outer tube (see, for example, Patent Document 1).

  It is also known to increase the impact strength of the shroud by winding a linear or mesh reinforcing body made of inorganic fibers such as heat-resistant ceramics around the shroud (Patent Document 2). reference.).

Further, as a reinforcing body of the shroud, an intermediate portion of one heat-resistant inorganic fiber yarn is wound around the outer periphery of one end side of the shroud and fixed, and then both ends are directed to the other end of the shroud in opposite directions. There is also known a configuration in which both ends are fixed to the shroud at the end of the spiral on the other end side of the shroud. In the case of this form, two intersections where a pair of heat-resistant inorganic fiber yarns in the opposite direction cross each other are formed at 180 ° intervals on the outer periphery of the shroud.
Japanese Patent Laid-Open No. 5-121047 Japanese Patent Laid-Open No. 2003-100300 (paragraph 0060)

  However, in a high-pressure discharge lamp having a rated lamp power of 400 W or less, in which the inner pressure of the arc tube is relatively high, such as a mercury lamp ballast-adapted high-pressure discharge lamp, particularly 200 to 400 W in which the size of the arc tube is relatively large, Depending on the form of the reinforcing body disposed on the outer peripheral surface of the shroud, damage to the outer tube could not be sufficiently prevented against the rupture of the arc tube.

  In the reinforcing body disposed on the outer peripheral surface of the shroud, the reinforcement of the shroud is strengthened as the arrangement interval of the heat-resistant inorganic fiber yarns becomes closer, so that the outer tube is less likely to be damaged by the rupture of the arc tube. However, on the other hand, there is a problem that the total luminous flux of the high-pressure discharge lamp is reduced due to an increase in the amount of light shielded by the reinforcing body.

  In addition, when the arc tube is ruptured, the fragments are scattered irregularly, so that reinforcement by the reinforcing body is required to have low directionality, and at the same time, the reduction in total luminous flux should be as small as possible. I must.

  However, in the case where the reinforcing body is spirally wound in a known opposite direction, the heat-resistant inorganic fiber yarns are densely arranged near the intersection of the helical parts in the opposite direction. Although it becomes large, since the arrangement | positioning of a heat resistant inorganic type fiber thread becomes sparse in the intermediate part of an intersection and an intersection, intensity | strength becomes relatively small. Therefore, there is a problem that relatively large intensity unevenness, that is, directionality occurs at intervals of 90 ° in the circumferential direction of the outer peripheral surface of the shroud.

  In addition, a form of a reinforcing body in which one heat-resistant inorganic fiber yarn is wound in a single spiral from one end to the other end of the shroud is also conceivable. Is difficult to fix to the shroud.

  The present invention improves the arrangement structure of the reinforcing body arranged on the outer peripheral surface of the shroud, reduces the decrease of the total luminous flux, and improves the damage suppression effect of the outer tube against an emergency tube burst, It is an object of the present invention to provide a high-pressure discharge lamp with reduced intensity directionality and an illumination device using the same.

  The high-pressure discharge lamp of the present invention comprises a translucent airtight container, a pair of electrodes sealed and opposed to the inside of the translucent airtight container, and at least a rare gas and a luminescent metal halide. An arc tube having a rated lamp power of 400 W or less having a discharge medium enclosed therein; a cylindrical shroud made of a heat-resistant translucent member that surrounds the arc tube from the side; and is substantially in close contact with the outer peripheral surface of the shroud Thus, a spiral portion of a plurality of turns is formed by winding in the opposite direction, and the pitch L (mm) in the shroud longitudinal direction of two adjacent turns in the spiral portion wound in the same direction A reinforcing body made of a heat-resistant inorganic fiber yarn that satisfies 5 ≦ L ≦ 15; a support member that supports both ends of the arc tube and the shroud; a starting element that includes a starting element and is supported by the support member A circuit component; an outer tube that houses the arc tube, shroud, reinforcement, support member, and starting circuit component; and a power supply member that feeds the arc tube and the starting circuit component via the outer tube; It is characterized by having.

  In the present invention, when the pitch L (mm) in the shroud longitudinal direction of two adjacent turns in the spiral portion where the heat-resistant inorganic fiber yarn of the reinforcing body is wound in the same direction is less than 5 mm, the arc tube by reinforcement is used. Although the damage prevention effect of the outer tube against the rupture is further enhanced, the ratio of the visible light shielded by the reinforcing body increases too much, so that the desired total luminous flux cannot be obtained. On the other hand, when the pitch L exceeds 15 mm, a desired total luminous flux can be obtained, but the effect of suppressing damage to the outer tube against the rupture of the arc tube by the reinforcing body is too low. Therefore, in order to achieve the desired effect of the present invention, the pitch L needs to satisfy the above mathematical formula. Further, if the pitch L is within a range satisfying the formula 8 ≦ L ≦ 12, a more preferable effect can be obtained.

  Further, the reinforcing body is configured such that four or more crossing points dispersed on the outer peripheral surface of the shroud are formed by intersecting spiral portions formed by winding the heat-resistant inorganic fiber yarns in opposite directions. be able to. In this case, the intersections are distributed on the outer peripheral surface of the shroud at intervals of 90 ° or less. The pitch L (mm) of two adjacent turns in the spiral portion of the heat-resistant inorganic fiber yarn wound in the same direction is allowed to vary within a range satisfying the above mathematical formula. The positions of the intersections can be arranged slightly deviated before and after the center value at a uniform angular interval (for example, 90 ° interval when there are four intersections) on the circumference.

  According to the present invention, the reinforcing body disposed in close contact with the outer peripheral surface of the shroud is formed by winding spiral portions of a plurality of turns in opposite directions in the forward and reverse directions with the heat-resistant inorganic fiber yarns, and the same When the pitch L (mm) of two adjacent turns in the spiral portion wound in the direction satisfies the formula 5 ≦ L ≦ 15, the total luminous flux is reduced little and the arc tube is generated extremely rarely. It is possible to provide a high-pressure discharge lamp and an illuminating device including the high-pressure discharge lamp in which the effect of suppressing the outer tube against the bursting of the lamp is improved.

  In addition, since four or more intersections formed by spiral portions formed by winding in the opposite direction are dispersed on the circumference, the direction of reinforcement can be reduced.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

    1 to 3 show a metal halide lamp as an embodiment for carrying out the high-pressure discharge lamp of the present invention. FIG. 1 is a front view, FIG. 2 is a right side view, and FIG. 3 is an assembly of a shroud and a reinforcing body. (A) is a plan view, (b) is a front / rear view, and (c) is a right / left side view.

  In the present invention, the high-pressure discharge lamp L has a rated lamp power of 200 to 400 W, but the metal halide lamp in the illustrated form has a rated lamp power of 400 W. The high-pressure discharge lamp L of the present invention includes an arc tube 4, a shroud 6, a reinforcing body 63, a support member 7, a starting circuit component 80, an outer tube 1, and a power feeding member.

  [About the arc tube 4] The arc tube 4 includes a translucent airtight container 40, a pair of electrodes 5a and 5b, and a discharge medium.

  The translucent airtight container 40 differs depending on the rated lamp power of the high-pressure discharge lamp, but in the case of quartz glass in this embodiment, the wall thickness is about 1.0 mm to 2.0 mm and the inner diameter is about 10 to 20 mm. It is formed by forming pinch seal portions 4a and 4b at both ends of a T-shaped quartz glass tube. And the substantially cylindrical discharge space is formed in the inside. In addition, sealing metal foils 41a and 41b made of molybdenum are embedded in the pinch seal portions 4a and 4b in an airtight manner.

  However, the translucent airtight container 40 is not only made of quartz glass, but also, for example, a heat-resistant translucent high silica glass mainly composed of silicon oxide such as borosilicate glass or aluminosilicate glass, porous alumina, YAG, and the like. It may be made of polycrystalline or single crystal ceramics such as yttria.

  Furthermore, the shape of the translucent airtight container 40 is a single shape or a composite shape such as a cylindrical shape, an oval shape, a spherical shape, and the shape of the sealing portion formed at the end portion is crushed in the case of glass. Sealing and shrink (baking drawing) sealing can be used, and in the case of ceramic, sealing with a disk or cap can be employed. Moreover, the introduction conductor sealed in the sealing part of the translucent airtight container 40 is not limited to the sealed metal foil, and may be a metal wire or the like.

  The pair of electrodes 5a and 5b are preferably made of a heat-resistant conductive metal mainly composed of tungsten (W) or the like, sealed at both ends in the tube axis direction in the light-transmitting hermetic container 40, and the tip portions are separated from each other. Opposite. In addition, the distance between electrodes can be set to about 15-45 mm, for example. The pair of electrodes 5a and 5b are arranged such that their base end portions are connected to the sealing metal foils 41a and 41b by welding or the like, and their intermediate portions are loosely supported by quartz glass. However, in this embodiment, the electrode 5b is covered with a light-shielding inorganic heat insulating film deposited on the outer surface of the upper end of the translucent airtight container 40 and cannot be seen through from the outside.

  The discharge medium contains at least a rare gas and a luminescent metal halide, and is enclosed in a discharge space formed inside the translucent airtight container 40. The noble gas can act as a starting gas and a buffer gas. The gas is preferably argon (Ar) gas, but may be sealed so as to mix other rare gases such as neon (Ne) having a partial pressure ratio of 10% or less, preferably 5% or less.

  The halide of the luminescent metal is not particularly limited, but encapsulates at least one halide of a metal such as sodium (Na), scandium (Sc), cesium (Cs), cerium (Ce), and dysprosium (Dy). be able to. By using these halides, the luminous efficiency and / or color rendering of the high-pressure discharge lamp L can be set to a desired high value. Note that iodine (I) and / or bromine (Br) is preferably used as the halogen.

  As a discharge medium, in addition to the rare gas and the halogen of the luminescent metal, mercury (Hg), which mainly acts as a buffer material for lamp voltage formation, and a high vapor pressure during lighting, a low ionization voltage, and light emission in the visible range. Less metal, such as halides such as zinc, can be encapsulated.

  The arc tube 4 includes external lead wires 42a and 42b in addition to the main components described above. The external lead wires 42a and 42b are connected at their tips to the sealing metal foils 41a and 41b by welding or the like inside the pinch seal portions 4a and 4b of the translucent airtight container 40, and the other ends are translucent. It leads out to the outside of the airtight container 40.

  [About the shroud 6] The shroud 6 is made of a heat-resistant translucent member, for example, quartz glass, has a cylindrical shape, and is disposed so as to surround the arc tube 4 substantially concentrically from the side. Note that the shroud 6 is open at both upper and lower ends in the drawing, and an appropriate space is formed between the arc tube 4 and the inner surface of the shroud 6. The shroud 6 is supported at a predetermined position by being fixed to a support member 7 described later.

  [Reinforcing body 63] The reinforcing body 63 is disposed in close contact with the outer peripheral surface of the shroud 6 to reinforce the shroud 6. In addition, the reinforcing body 63 has a configuration in which a heat-resistant inorganic fiber yarn mainly composed of alumina or the like is wound in the opposite direction to form a spiral portion having a plurality of turns. That is, a spiral portion wound in the clockwise direction and a spiral portion wound in the counterclockwise direction are formed to overlap each other. Further, in the reinforcing body 63, for example, in a spiral portion wound in the clockwise direction (or counterclockwise direction), the pitch L (mm) in the shroud longitudinal direction of two adjacent turns satisfies the formula 5 ≦ L ≦ 15. It is formed to be satisfied.

  Note that, as shown in FIGS. 3B and 3C, the pitch L is measured at a portion where an intersection CP between a clockwise spiral portion and a counterclockwise spiral portion is formed. Good. Therefore, when two intersections CP and CP adjacent in the vertical direction are formed so as to coincide with the tube axis direction, the pitch L can be measured between the two intersections CO and CP. However, if two vertically adjacent intersections CP do not coincide with each other in the tube axis direction, the pitch in the tube axis direction of the adjacent turn at any one of the upper and lower intersections CP may be measured.

  The configuration of the reinforcing body 63 in this embodiment will be described in further detail as follows. That is, as shown in FIG. 3, one heat-resistant inorganic fiber yarn is prepared, and its central portion is first wound around the upper portion of the shroud 6 in the figure and then fixed on one side 63a at a predetermined pitch. Wrap while winding clockwise on the outer peripheral surface. Further, the other side 63b is wound around the outer peripheral surface of the shroud 6 at a predetermined pitch while being wound counterclockwise. The both sides 63a and 63b can be wound simultaneously and in the opposite direction. However, if desired, the other side 63b may be wound after the one side 63a is wound. Then, when the spiral portions of a plurality of turns wound in the opposite directions are formed, the intermediate portions of the one side 63a and the other side 63b are wound around the shroud 6 and fixed at the end portions of the spiral portions. Thus, the first set of spiral portions in the opposite direction are formed.

  Next, each of the one side 63a and the other side 63b of the heat-resistant inorganic fiber yarn wound around the lower portion of the shroud 6 is positioned with respect to the position of the end of the spiral in the first set of spiral portions in the opposite direction. The one side 63a and the other side 63b are wound from the position shifted in the circumferential direction of 90 ° in the forward and reverse directions from the bottom to the upper side at the same pitch as the first set of spiral portions in the opposite direction. Then, when the winding ends at the upper end portion of the shroud 6 and the end portion thereof is wound around the shroud 6 and fixed, the second set of spiral portions in the opposite direction are added to the first set of spiral portions. It is formed from one heat-resistant inorganic fiber yarn. If desired, the reinforcing body 63 having a pitch substantially the same as that described above can be formed using a plurality of heat-resistant inorganic fiber yarns.

  The reinforcing body 63 is formed as described above. That is, in this embodiment, the reinforcing body 63 is composed of two sets of spiral portions in opposite directions. Therefore, the reinforcing body 6 includes two sets of clockwise spiral portions and two sets of counterclockwise spiral portions. Moreover, the spiral portions wound in the opposite direction of the first set and the second set of the same spiral portions are formed so as to be shifted from each other by 90 °. As a result, as shown in FIG. 3 (a), an intersection CP formed by the intersection of the spiral portion wound in the clockwise direction and the spiral portion wound in the counterclockwise direction indicates the shroud 6 When viewed from above or below, four are formed at 90 ° intervals on the circumference. In the case of determining whether the pitch L (mm) of two adjacent turns satisfies the formula 5 ≦ L ≦ 15, in the present embodiment, the two adjacent turns are the first set of spirals. The turn of the spiral portion and the turn of the second set of spiral portions adjacent to this.

  When six intersections of the reinforcing bodies 63 are formed along the circumference of the outer peripheral surface of the shroud 6, the three heat-resistant inorganic fiber yarns are shifted in the circumferential direction by 60 ° and wound as described above. If it rotates, the reinforcement body 6 which satisfies the requirements in the present invention can be formed.

  [About Support Member 7] The support member 7 is a means for supporting the arc tube 4, the shroud 6, and a starting circuit component 80 described later, and a member on the lower side 72 (neck portion 13 side) thereof is attached to the stem 2 described later. A support wire (not shown) which is fixed to a supported metal member (not shown) or the like by fastening means or is provided separately from the introduction wires 21 and 22 implanted in the stem 2 and not connected to the external introduction wire. .) Is supported in the outer tube 1 to be described later. That is, the support member 7 is not conductively connected to the power supply member 3 described later to the arc tube 4 such as the introduction lines 21 and 22 and the power supply line described later.

  The shroud 6 is punched into a ring shape substantially the same shape as the end surface of the shroud 6 at a predetermined position in the middle of the support member 7 and a pair of spaced holding plates provided with standing pieces 61,..., 62,. 60 and 60 are held against both ends, and the standing pieces 61 are erected to restrain the end portion of the shroud 6 from the outside, and are sandwiched from both sides of the inner and outer surfaces, and a part of the standing pieces 62,. 7 is fixed and held by connecting it with means such as welding or caulking.

  The holding plates 60, 60 hold both ends of the shroud 6, and pinch seal stoppers 4a, 4b of the arc tube 4 in the shroud 6 with cut and raised pieces (not shown), thereby causing the arc tube. 4 is held and fixed.

  In addition, metal blade-like elastic (spring) members 73 and 73 are provided on the upper side surface of the support member 7, and the elastic (spring) members 73 and 73 are elastically formed on the inner peripheral surface of the top portion 12 of the valve 1. By abutting, the arc tube 4 and the shroud 6 can be on the central axis of the outer tube 1 and vibration resistance can be improved. Although not shown, an elastic (spring) member may be provided on the lower side surface of the support member 7 so as to elastically contact the inner peripheral surface of the neck portion 13 of the outer tube valve 1. In the figure, reference numerals 77,... Denote bridge members made of an electrical insulator that bridges and reinforces between the support member 7 and power supply lines 74, 75 described later.

  [Starting Circuit Configuration Unit 80] The starting circuit configuration unit 80 is means for assisting the start of the high-pressure discharge lamp L. In this embodiment, for example, a start glow starter (lighting tube) 81, heat using a bimetal is used. It consists of a response switch 82 and a resistor 83 connected in series.

  The glow starter (lighting tube) 81 has a structure in which a sealing portion in which a lead wire is hermetically sealed is formed at one end of a bulb made of, for example, quartz glass, and the bimetal connected to the lead wire is formed in the bulb. The discharge electrodes made of are opposed to each other at a predetermined interval, and argon (Ar) is sealed at a predetermined pressure. The glow starter 81 can be configured such that glow discharge occurs between the bimetal and the discharge electrode when energized, and the argon gas radiates ultraviolet rays by the glow discharge of the glow starter 81.

  [About the outer tube 1] The outer tube 1 is a means for accommodating the arc tube 4, the shroud 6, the reinforcing wire 63, the support member 7, and the starting circuit component 80 in the inside thereof so that the high pressure discharge lamp L has a double tube structure. It is. In this embodiment, the outer tube 1 is made of a light-transmitting hard glass such as borosilicate glass made of a BT bulb, and has a bulging portion 11 at the center portion, and an upper closed top portion 12 and The lower neck portion 13 is formed to have a small diameter portion. A stem 2 having lead-in wires 21 and 22 is provided on the neck portion 13 side.

  [Regarding Power Supply Member] The power supply member is means for supplying power to the arc tube 4 and the starting circuit component 80 via the outer tube 1. In this embodiment, the E-shaped base 3 and the power supply lines 74, 75, 76, etc. Consists of.

  The electrical connection in the outer tube 1 is performed as follows. That is, one terminal of the base 3 attached to the neck portion of the outer tube 1 is connected to one introduction line 21 of the stem 2, the feeder line 75, the feeder line 76, and the arc tube 4 as shown in FIG. The line 42b is connected in series to the upper electrode 5b that cannot be seen through from the outside. The feeder 76 is a thin line that is curved and separated away from the translucent airtight container 40.

  On the other hand, as shown in FIG. 1, the other terminal of the base 3 is connected to the lower electrode 5a through the other lead-in line 22 of the stem 2 and through the external lead-in line 42a of the arc tube 4. ing. A starting circuit component 80 is connected in parallel with the pair of electrodes 5 a and 5 b of the arc tube 4.

  In this embodiment, the arrangement direction of the glow starter 81 accompanied by ultraviolet radiation is not particularly limited. For example, the bulb having the glow starter 81 that is substantially coaxial with the central axis of the arc tube 4 and has the highest ultraviolet transmission. Are attached to the feeder lines 74 and 75 so that the sealed portion side faces the arc tube 4.

  That is, in the glow starter 81, the emitter material formed on the discharge electrode is scattered during aging, and a lot of the emitter material is deposited on a specific portion of the bulb inner surface, for example, the top (top) side of the bulb. Since the top side is opaque and the radiation of ultraviolet rays from the top is obstructed, the sealing portion side is directed to the arc tube 4.

  In this embodiment, the arc tube 4 and the shroud 6 are supported by the support member 7, but the support member 7 is not electrically connected to any potential, and is connected to the electrodes 5 a and 5 b in the arc tube 4. The electrical connection is performed by another power supply member such as the power supply lines 74 and 75 from the introduction lines 21 and 22 of the stem 2.

  Thus, the high-pressure discharge lamp L of this embodiment is lit in a vertical, horizontal, or inclined state.

  The high pressure discharge lamp L of this embodiment is started and lit as follows. That is, the high-pressure discharge lamp L is mounted on the lamp socket, and energized from the power source through the lighting circuit device having a ballast or the like. The high-pressure discharge lamp L connected to this lighting circuit device is, at the start-up, the arc tube 4 through the lead wires 21 and 22 and the feeder lines 74 and 75 electrically connected to the terminal portion (not shown) of the base 3. A voltage is applied between both ends of a starting circuit configuration unit 80 including a pair of electrodes 5a and 5b and a glow starter 81 connected in parallel to the power supply lines 74 and 75.

  By applying this voltage, the starting circuit component 80 in which the glow starter (lighting tube) 81, the thermal responsive switch 82, and the resistor 83 are connected in series has a low resistance and a low impedance between the bimetal electrodes in the glow starter 81 and the fixed electrodes separated from each other. Alternatively, a discharge occurs between a pair of spaced apart bimetal electrodes, and a pair of electrodes 5 a and 5 b positioned at both ends of the arc tube 4 by emitting ultraviolet rays from the substantially transparent sealing portion side of the glow starter 81. Ultraviolet rays are irradiated toward Then, the bimetal electrode in the glow starter 81 is heated by the discharge, is thermally bent (responded), and comes into contact with the other electrode, thereby stopping the discharge.

  That is, when the pair of electrodes 5a and 5b existing in the discharge space of the arc tube 4 is irradiated with ultraviolet rays with energy equal to or higher than the work function of the electrode constituent metal, electrons are emitted from the surfaces of the electrodes 5a and 5b. The number of electrons increases, and electric discharge easily occurs between the electrodes 5a and 5b.

  Then, at the moment when the bimetal electrode in the glow starter 81 is cooled and separated from the discharge electrode, a high voltage pulse is generated in the ballast of the lighting circuit device 89, and the discharge occurs when this high voltage pulse is applied to both electrodes 5a and 5b. Is generated between the electrodes 5a and 5b, and the arc tube 4 can be easily started in a short time, and thereafter stable lighting can be maintained.

  If a discharge occurs between the electrodes 5a and 5b, the temperature of the arc tube 4 rises, the thermal responsive switch 82 is opened, and the electrical connection to the starting circuit component 80 including the glow starter 81 is also cut off. During this lighting, the glow starter 81 does not generate a glow discharge again.

  As described above, the reinforcing body 63 formed on the outer peripheral surface of the shroud 6 is as described above even if the internal pressure at the time of lighting is high as in the case where the high-pressure metal vapor lamp L of this embodiment is a mercury lamp ballast compatible type, for example. Since it is configured, it is sufficiently reinforced, and the impact when the fragments when the arc tube 4 is ruptured is rarely mitigated to effectively prevent damage to the outer tube 1.

  On the other hand, if the reinforcing body 63 has the above-described configuration, the degree of shielding the visible light emitted from the arc tube 4 is small, so that the total luminous flux is hardly lowered.

  Next, referring to FIG. 4, the pitch L of the two turns adjacent to the spiral portion of the heat-resistant inorganic fiber yarn wound in the same direction of the reinforcing body 63, the outer tube damage rate, and the total luminous flux reduction rate Explain the results of the investigation of the relationship. In FIG. 4, the horizontal axis indicates the pitch Lmm between the intersections, and the vertical axis indicates the outer tube damage rate (%) on the right side and the total luminous flux reduction rate (%) on the left side. The outer tube damage rate is indicated by a dotted line graph. When the arc tube is ruptured by the test method according to ANSI C78.389-2004, the rate of damage of the outer tube due to scattered pieces is shown in%. . Further, the total luminous flux reduction rate is shown by a solid line graph. The total luminous flux of the high-pressure discharge lamp is reduced to 100% when the reinforcing body 63 is not provided due to the provision of the reinforcing body. The total luminous flux is shown in%.

  As can be understood from FIG. 4, the outer tube damage rate changes in a non-linear manner with a positive correlation with the change in the pitch L of adjacent turns between the intersections CP, and the pitch L between the intersections is 15 mm or less. For example, it was found that even if the arc tube ruptures, the outer tube is not damaged. Further, the total luminous flux reduction rate changes in a non-linear manner in a negative correlation with respect to the change in the pitch L between the intersections, and if the pitch L of adjacent turns between the intersections is 5 mm or more, it is practically acceptable. It turns out that it becomes a fall. Therefore, if the pitch L of adjacent turns between the intersections is within a range satisfying the formula 5 ≦ L ≦ 15, the outer tube will not be damaged when the arc tube bursts extremely rarely, and the total luminous flux It can be seen that a high-pressure discharge lamp with little reduction can be obtained.

    FIG. 5 is a longitudinal sectional view showing an outline of a lighting device for high ceiling as one embodiment for implementing the lighting device of the present invention. In FIG. 5, the luminaire 9 has a socket 92 attached to a base 91 that forms a mounting portion on a ceiling surface and the like, and a guard 93 is provided to surround the socket 92. A reflective shade 94 having a conical shape made of a metal plate or enamel and having a reflective surface formed on the inner surface is fixed to the lower end of the guard 93, and the base 3 of the high-pressure discharge lamp L is attached to the socket 92. Holding and electrical connection are made by this.

  In this embodiment, the base 91, the guard 93, the reflective shade 94, and the like constitute an instrument body. Further, the lamp lighting circuit device 89 and the power switch (not shown) can be provided at positions separated from the instrument body.

  Such a luminaire 9 is attached to the ceiling surface of a sports facility, for example, with the opening side of the reflective shade 94 facing downward, and when a power switch is turned on, high voltage discharge is performed from the power supply 88 through the lighting circuit device 89 and the socket. The lamp L is energized.

The front view of the metal halide lamp as one form for implementing the high-pressure discharge lamp of this invention Same right side view Similarly, an assembly of a shroud and a reinforcing body, (a) is a plan view, (b) is a front / back view, and (c) is a right / left side view. The graph which shows the relationship between the pitch L of two adjacent turns in the spiral part of the heat-resistant inorganic fiber yarn wound in the same direction of the reinforcing body, the outer tube damage rate, and the total luminous flux reduction rate The longitudinal cross-sectional view which shows the outline of the lighting fixture for high ceilings as one form for implementing the illuminating device of this invention

Explanation of symbols

1: outer tube, 4: arc tube, 4a, 4b: sealing part, 5a, 5b: electrode, 6: shroud, 7: support member, 40: translucent airtight container, 63: reinforcement, 80: starting circuit Component, L: High pressure discharge lamp

Claims (3)

A translucent airtight container, a pair of electrodes sealed and spaced inside the translucent airtight container, and a discharge medium enclosed in the translucent airtight container containing at least a rare gas and a halide of a luminescent metal An arc tube with a rated lamp power of 400 W or less;
A cylindrical shroud made of a heat-resistant translucent member surrounding the arc tube from the side;
A spiral portion of two turns adjacent to each other in a spiral portion wound in the same direction by forming a spiral portion of a plurality of turns by being almost closely attached to the outer peripheral surface of the shroud and wound in the opposite direction. A reinforcing body made of a heat-resistant inorganic fiber yarn having a pitch L (mm) satisfying the formula 5 ≦ L ≦ 15;
A support member for supporting the arc tube and the shroud;
A starting circuit component including a starting element and supported by the support member;
An outer tube that houses the arc tube, the shroud, the reinforcement, the support member and the starting circuit component;
A power supply member for supplying power to the arc tube and the starting circuit component via the outer tube;
A high-pressure discharge lamp comprising:   In the reinforcing body, spiral portions formed by winding in the opposite direction are crossed so that four or more crossing points dispersed along the circumference are formed on the outer peripheral surface of the shroud. 2. The high-pressure discharge lamp according to claim 1, wherein A lighting device body;
The high-pressure discharge lamp according to claim 1 or 2, which is disposed in the lighting device body;
A lighting circuit for lighting the high-pressure discharge lamp;
An illumination device comprising:

Images