JP2009266539A - Discharge lamp and lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharge lamp and a lighting fixture with a vessel at a part covered with an external electrode with little risk of being damaged by melting in case of increasing power supply, and further, with little risk of fall of luminous efficiency. <P>SOLUTION: The discharge lamp 1 includes a vessel 2, an external electrode 3 arranged at each end of the vessel 2, and an electricity switching control part 4. The external electrode 3 includes an upper electrode piece 31 and a lower electrode piece 32 capable of electricity switching. The electricity switching control part 4 detects each temperature of the first electrode piece 31 and the second electrode piece 32 in the vessel 2 by a temperature detecting part 43, and, when temperature detecting data detected exceed the electrode piece setting temperature, switching of electricity conduction is carried out between the upper electrode piece 31 and the lower electrode piece 32. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an external electrode type discharge lamp and a lighting fixture in which an external electrode is disposed on an outer surface of a container filled with a discharge gas.

  Conventionally, as a discharge lamp, an internal electrode type lamp (cold cathode type lamp) having an electrode inside a glass container is known. In recent years, an external electrode type discharge lamp (dielectric barrier discharge type lamp) in which an external electrode is disposed on the outer surface of a glass container is also known. As this external electrode type discharge lamp, for example, a discharge lamp (fluorescent lamp) for backlight such as a liquid crystal display has been proposed (see Patent Document 1).

  This discharge lamp for backlight includes an end cap type external electrode formed so as to wrap both ends of a glass container filled with a discharge gas. However, when the amount of power supply is increased in order to increase the amount of light in the discharge lamp, the portion covered with the end cap type external electrode in the glass container is overheated and the portion is often damaged.

On the other hand, in order to prevent the glass container from being damaged, a glass container having a thickness (thickness) that is easily damaged is thicker than other parts (see Patent Document 2 and FIG. 3).
Japanese Patent Laid-Open No. 2002-8408 JP 2004-79270 A

  However, as in Patent Document 2, when the thickness of the portion of the glass container covered with the external electrode is increased, the electrostatic coupling between the external electrode and the inside of the discharge lamp is weakened. As a result, there is a problem that the luminous efficiency of the discharge lamp is lowered.

  Disclosed is a discharge lamp and an illumination device in which the container covered with the external electrode is less likely to be damaged by melting even when the amount of power supply is increased in order to increase the amount of light, and the luminous efficiency is less likely to decrease. The purpose is to provide equipment.

  In order to solve the above-mentioned problem, according to claim 1 of the present invention, external electrodes are disposed on the outer surfaces of both ends of a container filled with a discharge gas so as to cover a part of the container. In the discharge lamp, each of the external electrodes includes a plurality of electrode pieces, and the plurality of electrode pieces are configured such that energization is sequentially switched by an energization switching control unit. A discharge lamp is provided.

  As in claim 2, the energization switching control unit includes the plurality of electrode pieces, or a portion covered with the plurality of electrode pieces in the container, and a temperature detection unit that detects respective temperatures, The temperature detection data detected by the temperature detection unit for the one electrode piece that is energized or the portion of the container covered by the one electrode piece that is energized is the electrode piece set temperature or the container setting. When the temperature is higher than the temperature, it is preferable to perform a process of switching energization to another electrode piece.

  According to a third aspect of the present invention, the energization switching control unit includes three types of energization status information including voltage information indicating current status for each of the plurality of electrode pieces, current information, and phase angle information of voltage and current. A status information detection unit that detects at least one of the current statuses, and the current status information detection data detected by the status information detection unit for the one electrode piece that is energized When the set value set according to the type is exceeded, it is preferable to perform a process of switching energization to another electrode piece.

  Moreover, in order to solve the said subject, Claim 4 of this invention is equipped with the discharge lamp as described in any one of Claims 1-3, and the lighting fixture main body holding this discharge lamp. A lighting apparatus is provided.

  According to claim 1 of the present invention, the plurality of electrode pieces are configured such that energization is sequentially switched by the energization switching control unit.

  Thereby, for example, when the temperature of the portion of the container covered with the electrode piece becomes higher than a certain temperature by energizing one electrode piece, the energization can be switched to another electrode piece.

  Accordingly, overheating of the container can be prevented, and even when the amount of power supply is increased in order to increase the amount of light, the container covered with the external electrode is less likely to be damaged by melting. In addition, the discharge lamp can be kept lit by switching the energization to the plurality of electrode pieces, making it convenient to use.

  Further, since the thickness of the portion covered with the external electrode in the container is not increased, the electrostatic coupling between the external electrode and the inside of the discharge lamp is weakened, and the luminous efficiency of the discharge lamp is reduced. Can be prevented.

  According to the second aspect, the energization switching control unit is detected by the temperature detection unit with respect to the one electrode piece that is energized or the portion that is covered with the one electrode piece that is energized in the container. When the temperature detection data becomes higher than the electrode piece set temperature or the container set temperature, the energization is switched.

  By doing so, the energization can be switched when the container reaches a certain temperature, and the container can be reliably prevented from overheating and highly reliable.

  According to claim 3, in the energization switching control unit, the energization status information detection data detected for one electrode piece that is energized is set according to the type of energization status information by the status information detection unit. When the set value is exceeded, a process of switching energization to another electrode piece is performed.

  For example, when the temperature of the inner surface of the container rises locally, it becomes easy to supply thermoelectrons from that portion, so that the voltage value decreases, the current value increases, while the phase angle value decreases. Therefore, for example, when the voltage information detection data detected by the status information detection unit becomes lower than a preset voltage setting value, if the energization is switched, the container will be at a certain temperature or higher. Can be prevented. Therefore, it is possible to prevent the container from reaching a melting temperature.

  At that time, the installation of a temperature detection sensor or the like for detecting the temperature of the portion of the container covered with the electrode pieces can be omitted, the configuration can be simplified, and the cost can be reduced.

  According to the fourth aspect of the present invention, it is possible to provide a luminaire having a discharge lamp in which a portion of the container covered with the external electrode is less likely to be damaged due to melting and the luminous efficiency is less likely to be reduced.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic explanatory view of a discharge lamp according to a first embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of the main part of the discharge lamp, and FIG. 3 is an enlarged vertical cross-sectional view of the main part of the discharge lamp. .

  As shown in FIGS. 1 and 2, the discharge lamp 1 of the first embodiment includes a straight tubular container 2, an external electrode 3, and an energization switching control unit 4. The container 2 includes a light emitting portion 21 that emits light, and electrode arrangement portions 22 that are arranged on both left and right ends of the light emitting portion 21 in the axial direction.

  The light emitting portion 21 is a portion that emits light. In this embodiment, the light emitting portion 21 is composed of a light-transmitting glass tube formed in a cylindrical shape from borosilicate glass. A phosphor 21a is applied to the inner surface of the light emitting portion 21, and a protective film (not shown) mainly composed of alumina is applied between the phosphor 21a and the glass tube. Yes.

  Further, the axial length L1 of the light emitting portion 21 in this embodiment is about 1200 mm. The outer diameter R1 is about 15.5 mm and the thickness is about 1 mm.

  The electrode placement portions 22 are portions where the external electrodes 3 are placed, and are formed on both the left and right sides of the light emitting portion 21 in the axial direction. The electrode arrangement part 22 of this embodiment is formed integrally with the light emitting part 21.

  Further, the axial length L2 of the electrode arrangement portion 22 in this embodiment is about 200 mm. Further, the outer diameter and the thickness thereof are approximately the same as the outer diameter and the thickness of the light emitting portion 21, respectively.

  The electrode arrangement portion 22 and the light emitting portion 21 constitute a container 2 whose inside is formed to be air-tight. Further, a discharge gas is sealed in the container 2 formed in such a medium airtight manner.

  In this embodiment, mercury vapor gas constituting an ultraviolet radiation material and argon as a rare gas serving as a buffer gas are sealed as a discharge gas, for example, 100 Pascals in an environment of 25 ° C. The mercury vapor gas is sealed in the form of liquid mercury, and the vapor pressure can be adjusted in the temperature environment when the discharge lamp is operated.

  Next, the external electrode 3 will be described. The external electrode 3 is for generating a dielectric barrier discharge in the container 2, and is arranged so as to cover almost the entire outer surface of each electrode arrangement portion 22 of the container 2.

  The external electrodes 3 are each composed of a plurality of electrode pieces. In this embodiment, the upper electrode piece 31 as a first electrode piece and the lower electrode piece 32 as a second electrode piece disposed below the upper electrode piece 31 are constituted.

  The upper electrode piece 31 and the lower electrode piece 32 are disposed so as to form a pair symmetrical in the vertical direction. More specifically, the upper electrode piece 31 and the lower electrode piece 32 are made of metal foil having the same area (the same size) and the same configuration.

  Each of them is attached to almost the entire length of the upper outer peripheral surface and the lower outer peripheral surface of the electrode arrangement portion 22 so as to sequentially separate a predetermined gap, thereby covering substantially the same area. .

  The upper electrode piece 31 and the lower electrode piece 32 configured as described above are electrostatically coupled to the inside of the container 2 via the electrode arrangement portion 22. In the electric circuit diagram, it is coupled to the inside of the container 2 through a capacitor having a predetermined capacity.

  The upper electrode piece 31 and the lower electrode piece 32 of each of the external electrodes 3 are connected to a lighting circuit 5 having a high-frequency power source 51 as shown in FIG. The same voltage is selectively applied.

  In the first embodiment, the energization switching control unit 4 includes a temperature determination unit 41 and an energization switching unit 42 as shown in FIG. In addition, the temperature determination unit 41 includes a temperature detection unit 43.

  As shown in FIGS. 2 and 3, the temperature detection unit 43 includes thermocouples 43a as temperature detection sensors disposed on the upper electrode piece 31 and the lower electrode piece 32, respectively. The temperature of each of the lower electrode pieces 32 can be detected.

  And the temperature determination part 41 determines whether the temperature detection data detected by the said temperature detection part 43 became higher than electrode piece preset temperature.

  This electrode piece set temperature is a temperature set lower than the temperature of each of the upper electrode piece 31 and the lower electrode piece 32 when the electrode placement portion 22 is melted. In this embodiment, the electrode piece set temperature is set to 300 ° C.

  The temperature detection unit 43 is not limited to a configuration that detects the temperatures of the upper electrode piece 31 and the lower electrode piece 32, but can be changed as appropriate. For example, the temperature detection part 43 shall detect the temperature of the electrode arrangement | positioning part 22 of the container 2 covered with the upper electrode piece 31 and the lower electrode piece 32, respectively. And the temperature determination part 41 may determine whether the temperature detection data of the electrode arrangement | positioning part 22 detected by the temperature detection part 43 became higher than container preset temperature.

  Moreover, what is necessary is just to make it set temperature lower than the temperature at the time of the electrode arrangement | positioning part 22 melting as container preset temperature in that case, for example.

  The temperature determination unit 41 determines that the temperature detection data is higher when the temperature detection data is higher than the electrode piece set temperature, and is not high when the temperature detection data is not higher than the electrode piece set temperature. Judgment.

  When the temperature determining unit 41 determines that the current is high, the energization switching unit 42 converts the voltage from the high-frequency power source 51 in the lighting circuit 5 from the upper electrode piece 31 to the lower electrode piece 32 or the lower electrode. It switches so that it may apply to the upper electrode piece 31 from the piece 32. FIG. That is, the energization switching unit 42 switches energization between the upper electrode piece 31 and the lower electrode piece 32.

  When a sine wave voltage of, for example, 100 kHz is applied from the high frequency power source 51 to the external electrode 3, for example, the upper electrode piece 31, of the discharge lamp 1 configured as described above, the alternating voltage is proportional to the amount of time change of the voltage. An electric field is applied to the hermetic space inside the container 2.

  This means that charges are accumulated or released on the inner surface of the electrode arrangement portion 22 covered with the portion where the upper electrode piece 31 is arranged. As a result, in the upper electrode piece 31, a current flows through the inside of the container 2 through the upper part of the electrode arrangement portion 22 of the container 2.

  This current also flows in the opposite direction according to the increase or decrease direction of the applied voltage. The electrons existing inside the container 2 are supplied with kinetic energy by the applied alternating electric field. And it collides with mercury atoms. The impacted mercury atoms are ionized or excited, and a discharge is generated inside the container 2.

  In this way, discharge is generated inside the container 2 and the conductive plasma 6 (shown in FIG. 2) is maintained. Excited mercury atoms emit ultraviolet light when returning to the ground state. The emitted ultraviolet light is converted into visible light by the phosphor 21 a applied to the light emitting portion 21 of the container 2 and goes out from the light emitting portion 21.

  At that time, in order to increase the light output from the light emitting portion 21, when a large electric power is input to the upper electrode piece 31, a part of the electrode arrangement portion 22 covered by the upper electrode piece 31 is locally Overheated. This is considered to be due to accelerated collision of ions due to the sheath electric field generated on the inner surface of the electrode arrangement portion 22. A portion where the electric field strength of the sheath is high is locally heated, and instantaneously reaches a high temperature of 800 ° C.

  When such a high temperature is reached, the borosilicate glass constituting the electrode arrangement portion 22 is melted. However, in the first embodiment, the energization switching control unit 4 operates as follows to prevent this.

  That is, the energization switching control unit 4 determines whether or not the temperature determination unit 41 has made the temperature of the upper electrode piece 31 higher than the electrode piece set temperature. And when it determines with becoming high, the energization switching control part 4 applies the voltage from the high frequency power supply 51 in the lighting circuit 5 to the lower electrode piece 32 from the upper electrode piece 31 by the energization switching part 42. Perform switching control.

  Thereby, the application of voltage to the upper electrode piece 31 is stopped, and the voltage is applied to the lower electrode piece 32. Therefore, the upper part of the electrode arrangement part 22 covered with the upper electrode piece 31 is suppressed from overheating and can be prevented from being melted and damaged. At that time, since the same voltage is applied to the lower electrode piece 32, the discharge lamp 1 continues to be lit with the same amount of power and the same amount of light.

  The energization switching control unit 4 performs the same control as that of the upper electrode piece 31 after performing the above switching. More specifically, the temperature determination unit 41 determines whether or not the temperature of the lower electrode piece 32 has become higher than the electrode piece set temperature.

  And when it determines with becoming high, the energization switching part 42 performs control which switches the voltage from the high frequency power supply 51 in the lighting circuit 5 so that it may apply to the upper electrode piece 31 from the lower electrode piece 32. FIG.

  Thereby, the application of the voltage to the lower electrode piece 32 is stopped, the voltage is applied again to the upper electrode piece 31, and the overheating of the lower portion of the electrode arrangement portion 22 covered with the lower electrode piece 32 is suppressed. Moreover, since the upper part of the electrode arrangement | positioning part 22 covered with the upper electrode piece 31 is already cooled, even if a voltage is applied, it does not become melting temperature immediately.

  Therefore, it is possible to prevent the electrode arrangement portion 22 from being melted and damaged. Also in that case, the same voltage is applied to the upper electrode piece 31 in the discharge lamp 1, so that the discharge lamp 1 continues to be lit with the same amount of power and the same amount of light.

  Next, the discharge lamp 100 of 2nd Embodiment is demonstrated with reference to FIGS. As shown in FIG. 7, the energization switching control unit 140 of the discharge lamp 100 according to the second embodiment includes an energization state determination unit 141 instead of the temperature determination unit 41 of the first embodiment.

  The energization status determination unit 141 includes a status information detection unit 144 that detects energization status information. The situation information detection unit 144 includes at least three types of energization situation information including voltage information indicating the energization situation of the lower electrode piece 32 or the upper electrode piece 31, current information, and phase angle information of voltage and current. Detect one.

  Then, the energization status determination unit 141 determines that each of the three types of energization status information is a set value set according to the type of energization status information, that is, a voltage set value, a current set value, a voltage and a current It is determined whether or not the set value of the phase angle is exceeded.

  This determination is based on voltage information detection data, current information detection data, phase angle information detection data of voltage and current, and the set value, which are current-carrying status information detection data detected by the status information detection unit 144. Do.

  Therefore, as shown in FIGS. 5 and 6, the energization switching control unit 140 of the second embodiment does not have the temperature detection unit as in the first embodiment, and instead detects the situation information. Part 144.

  For example, if the temperature of the inner surface of the electrode arrangement portion 22 is locally increased, the supply of thermoelectrons from that portion becomes easy, so the voltage value decreases and the current value increases, while the phase angle value is Get smaller.

  Therefore, when the energization status information indicating the energization status is voltage information, when the voltage information detection data detected by the status information detection unit 144 is lower than the preset value of the voltage, the set value is exceeded. Make a decision. In this case, for example, a value higher than the voltage value in the energized state where the inner surface of the electrode arrangement portion 22 is melted may be set as the voltage setting value.

  Further, when the energization status information indicating the energization status is current information, when the current information detection data detected by the status information detection unit 144 is higher than a preset value of the current set in advance, the set value is exceeded. Make a decision. In this case, for example, a numerical value lower than the current value in the energized state where the inner surface of the electrode arrangement portion 22 is melted may be set as the current setting value.

  Furthermore, when the energization status information indicating the energization status is phase angle information, the setting value is set when the phase angle information detection data detected by the status information detection unit 144 is smaller than a preset value of the phase angle. It is judged that the value has been exceeded. In this case, the set value of the phase angle may be set to a value smaller than the value of the phase angle in an energized state where the inner surface of the electrode placement portion 22 is melted, for example.

  In this embodiment, voltage information is adopted as the energization status information indicating the energization status, the voltage information is detected by the status information detection unit 144, and the detected voltage information detection data is lower than a preset voltage setting value. If it becomes, it is determined that the set value has been exceeded.

  Note that the energization status information is not limited to the form using the voltage information, and may be changed as appropriate as long as at least one of the three types of voltage information, current information, and phase angle information is used.

  The operation of the second embodiment configured as described above will be described. For example, when a voltage is applied to the upper electrode piece 31 from the high frequency power supply 151, the discharge bulb 100 is lit in the same manner as in the previous embodiment.

  Then, when the voltage information detection data detected by the status information detection unit 144 is lower than the set value of the voltage by the energization status determination unit 141, the energization switching control unit 140 determines that the set value has been exceeded.

  In addition, when it is determined that the value has exceeded, the energization switching control unit 140 causes the energization switching unit 142 to apply the voltage from the high frequency power supply 151 in the lighting circuit 150 from the upper electrode piece 31 to the lower electrode piece 32. Perform switching control.

  Thereby, the application of voltage to the upper electrode piece 31 is stopped, and the voltage is applied to the lower electrode piece 32. Therefore, the overheating of a part on the upper side of the electrode arrangement portion 22 covered with the upper electrode piece 31 is suppressed, and it is possible to prevent melting and damage. At that time, since the same voltage is applied to the lower electrode piece 32 having the same area as the upper electrode piece 31, the discharge lamp 1 continues to be lit with the same amount of power and the same amount of light.

  Then, the energization switching control unit 140 performs the same control as in the case of the upper electrode piece 31 after performing the above switching. More specifically, the energization switching control unit 140 determines that the set value is exceeded when the voltage information detection data detected by the status information detection unit 144 is lower than the set value of the voltage by the energization status determination unit 141.

  In addition, the energization switching control unit 140 that has made the above determination performs control to switch the energization switching unit 142 so that the voltage from the high-frequency power source 151 in the lighting circuit 150 is applied from the lower electrode piece 32 to the upper electrode piece 31.

  Thereby, the application of the voltage to the lower electrode piece 32 is stopped, the voltage is applied to the upper electrode piece 31 again, and the overheating of a part on the lower side of the electrode arrangement portion 22 covered with the lower electrode piece 32 is suppressed. Can be prevented from being melted and damaged. Also in that case, the same voltage is applied to the upper electrode piece 31 in the discharge lamp 1, so that the discharge lamp 1 continues to be lit with the same amount of power and the same amount of light.

  In the second embodiment configured as described above, it is not necessary to provide a temperature detection sensor, and power supply (energization) to the upper electrode piece 31 and the lower electrode piece 32 can be switched with a relatively simple configuration. Can be made at low cost.

  Next, the lighting fixture of this invention is demonstrated. As shown in FIG. 8, the lighting fixture 200 of the present invention includes a discharge lamp 1 and a lighting fixture main body 201. In this embodiment, the discharge lamp 1 having the same configuration as that of the first embodiment is used.

  The luminaire main body 201 includes a lamp holding member 202 that holds the discharge lamp 1 and a high-frequency power source 51 that supplies high-frequency power, and is connected to the upper electrode piece 31 and the lower electrode piece 32 of the external electrode 3 ( 1), a power cord (not shown), and the like. The lighting fixture 200 is not limited to the form using the discharge lamp 1 of the first embodiment, but can also use the discharge lamp 100 of the second embodiment, and can be changed as appropriate.

In the discharge lamps of the first embodiment and the second embodiment, mercury and rare gas are used as the discharge gas. However, the present invention is not limited to this. For example, only rare gas may be used. In that case, it is possible to provide a so-called temperature-free discharge lamp or lighting apparatus that is less affected by the ambient temperature, although the luminous efficiency is lower than that of mercury.

  For example, xenon may be encapsulated as a rare gas, and the combination of ultraviolet light emission and phosphor may be used. Alternatively, neon may be encapsulated without applying the phosphor, and its direct red emission may be used.

  In the discharge lamps of the first and second embodiments, the metal foil is attached to the outer periphery of the container as the external electrode material. However, the present invention is not limited to this, and the conductive member is attached to the outer surface of the container. It can be changed as appropriate.

  For example, a metal vapor deposition film or a conductive paste can be applied. In general, the better the degree of adhesion between the electrode arrangement portion and the conductive member, the higher the performance such as the light emission efficiency. However, the selection may be made in consideration of manufacturability and cost.

  In the above embodiment, each of the two external electrodes 3 is composed of the upper electrode piece 31 as the first electrode piece and the lower electrode piece 32 as the second electrode piece. Not limited to this, it can be composed of three or more electrode pieces, and can be changed as appropriate.

  Further, the arrangement position of the electrode pieces is not particularly limited. For example, in the case of two electrode pieces, the electrode pieces are not limited to those arranged at the upper part and the lower part of the container as in the above embodiment. The front part and the rear part may be disposed, and may be appropriately changed.

  In the above embodiment, a 100 kHz sine wave is applied for high frequency application by the high frequency power supply, but any power supply whose voltage changes with time can be used. For example, a short wave or a triangular wave can also act. The frequency can also be selected from the viewpoint of efficiency, circuit cost, leakage current, EMI noise, and the like.

It is a schematic explanatory drawing of the discharge lamp of 1st Embodiment of this invention. FIG. 3 is an enlarged cross-sectional clear view of the main part of the discharge lamp of the first embodiment. It is an enlarged vertical sectional view of the principal part of the discharge lamp of the first embodiment. It is a block diagram for demonstrating the electricity supply switching control part of 1st Embodiment. It is a schematic explanatory drawing of the discharge lamp of 2nd Embodiment. It is an enlarged vertical clear view of the principal part in the 2nd Embodiment. It is a block diagram for demonstrating the electricity supply switching control part of 2nd Embodiment. It is a front view of a lighting fixture.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,100 Discharge lamp 2 Container 3 External electrode 4,140 Energization switching control part 5 Lighting circuit 31 Upper electrode piece 32 Lower electrode piece 200 Lighting fixture

Claims (4)

A discharge lamp in which external electrodes are arranged on the outer surfaces of both ends of a container filled with a discharge gas so that an external electrode can be energized so as to cover a part of the container,
Each of the external electrodes includes a plurality of electrode pieces,
The plurality of electrode pieces are configured such that energization is sequentially switched by an energization switching control unit.   The energization switching control unit includes a temperature detection unit that detects the temperature of each of the plurality of electrode pieces or a portion of the container covered with the plurality of electrode pieces. When the temperature detection data detected for one covered electrode piece or the portion covered with one energized electrode piece in the container is higher than the electrode piece set temperature or the container set temperature The discharge lamp according to claim 1, wherein the discharge lamp is configured to perform a process of switching energization to another electrode piece.   The energization switching control unit detects at least one of three types of energization status information: voltage information indicating current status for each of the plurality of electrode pieces, current information, and phase angle information between voltage and current. A setting that includes a status information detection unit, and that the status information detection unit detects the energization status information detection data detected for the one electrode piece that is energized, according to the type of the status information The discharge lamp according to claim 1, wherein the discharge lamp is configured to perform a process of switching energization to another electrode piece when the value is exceeded. A lighting fixture comprising: the discharge lamp according to any one of claims 1 to 3; and a lighting fixture main body holding the discharge lamp.

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