JP2005129408A - Microwave electrodeless discharge lamp device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a microwave electrodeless discharge lamp device capable of alleviating degradation of a hollow structural member. <P>SOLUTION: The device is provided with a magnetron 7 generating microwaves, a resonator 9 equipped with a coupling window 10 introducing the microwaves generated by the magnetron 7 and restraining the microwaves from being discharged to an outside space, and a bulb 4 arranged in an inner space of the resonator 9 and emitting light by the microwaves generated by the magnetron 7. The resonator 9 is of a metal mesh 2 with a part covering a front and sides of the bulb 4 in a semispherical or a semielliptic spherical shape, or of a curved surface as a part of them, with a rear of the bulb 4 in a shell shape to be made into a flat conductive plate 3. An electromagnetic field mode of the microwaves generated by a microwave generating part in the inner space of the resonator is to be TE011. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a microwave electrodeless discharge lamp device that emits light from a discharge bulb using microwaves.

  Conventionally, a discharge gas-filled bulb and a microwave generator for generating microwaves are provided, and the gas enclosed in the bulb is ionized and excited by microwaves, and light generated by the ionization and excitation is used as a light source. There is known a microwave electrodeless discharge lamp device used as In such a microwave electrodeless discharge lamp apparatus, the bulb and the microwave generator are covered with a hollow component member made of a mesh-like metal mesh, and the electromagnetic field generated in the internal space of the hollow component member is covered. Energy is supplied to the valve and leakage of microwaves to the external space is suppressed, and visible light generated from the valve is transmitted to the external space through the mesh of the cavity constituent members.

As a hollow component used in such a microwave electrodeless discharge lamp device, for example, a cylindrical member (see, for example, Patent Document 1 and Patent Document 2), or an opening portion of a reflecting mirror formed in a bowl shape. Is covered with a mesh-like metal mesh (for example, see Patent Document 3), or has a shape in which the side surface of the cavity component is a part of a spheroid or a part of a paraboloid ( For example, see Patent Document 4).
JP 59-86153 A JP 7-45104 A JP 57-60695 A JP 2003-022786 A

  By the way, in the microwave electrodeless discharge lamp apparatus as described above, the induced current caused by the microwave flows through the metal mesh constituting the cavity component member, so that it is thin to transmit visible light, and therefore has a small current capacity. There was a problem that the metal mesh comprised of deteriorated. FIG. 10 is a side view of the cavity constituent member 101 in the microwave electrodeless discharge lamp apparatus using a cylindrical cavity constituent member. When microwaves are supplied to the internal space of the cavity constituent member 101 shown in FIG. 10, an electric field is generated in the direction indicated by the arrow, and the metal mesh that forms the side surface of the cavity constituent member 101 and the electric field are orthogonal The current flowing through the mesh increases and the metal mesh deteriorates. In addition, when the metal mesh on the side surface of the cavity component is a shape that is a part of a spheroid or a part of a paraboloid, similarly to the case of using a cylindrical cavity component, The metal mesh deteriorates.

  FIG. 11 is a cross-sectional view of the cavity component member 102 in the microwave electrodeless discharge lamp apparatus using the cavity component member in which the opening of the reflecting mirror formed in a bowl shape is covered with a mesh-like metal mesh. When microwaves are supplied to the internal space of the cavity constituting member 102 shown in FIG. 11, an electric field is generated in the direction indicated by the arrow by the electric field of the TM011 mode, and the metal mesh 103 covering the opening of the reflector 104 Where the crosses are orthogonal to each other, the current flowing through the metal mesh increases and the metal mesh deteriorates.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a microwave electrodeless discharge lamp device that can reduce the deterioration of the cavity component.

  In order to achieve the above object, a microwave electrodeless discharge lamp apparatus according to a first means of the present invention includes a microwave generation unit that generates a microwave, and a microwave generated by the microwave generation unit. A cavity component having an introduction part to be introduced and suppressing the microwave from being released to the external space, and light emission emitted by the microwave generated by the microwave generator disposed in the internal space of the cavity component In the microwave electrodeless discharge lamp device having a portion, the shape of the hollow component member is a hemispherical shape, a semi-elliptical spherical shape, or a curved shape in which a portion covering the front and side of the light emitting portion is a part thereof The light emitting portion has a shell-like shape formed by a conductor plate behind the light emitting portion, and at least a part of the curved portion of the hollow component member is emitted from the light emitting portion. The hollow constituent member is configured to change the electromagnetic field mode of the microwave generated by the microwave generation unit in the internal space of the hollow constituent member to TE011. It is said.

  The above-mentioned microwave electrodeless discharge lamp device may further include a reflector made of a dielectric material that reflects visible light emitted from the light emitting unit between the light emitting unit and the introduction unit. Yes.

  And in the above-mentioned microwave electrodeless discharge lamp apparatus, the said reflecting plate is spaced apart and arrange | positioned from the said conductor plate, It is characterized by the above-mentioned.

  In the microwave electrodeless discharge lamp apparatus having such a configuration, the TE011 mode electric field generated in the internal space of the cavity component member is not orthogonal to the curved surface shape portion that transmits visible light emitted from the light emitting unit. The induced current flowing through the curved portion of the member is reduced, and the deterioration of the cavity component member can be reduced.

  Embodiments according to the present invention will be described below with reference to the drawings. In addition, the structure which attached | subjected the same code | symbol in each figure shows that it is the same structure, The description is abbreviate | omitted.

(First embodiment)
FIG. 1 is a partial cross-sectional view showing an example of the configuration of a microwave electrodeless discharge lamp apparatus according to a first embodiment of the present invention. FIG. 2 is an external perspective view of the microwave electrodeless discharge lamp device 1 shown in FIG. A microwave electrodeless discharge lamp device 1 shown in FIG. 1 includes, for example, a metal mesh 2, a conductor plate 3, a bulb 4 corresponding to a light emitting unit, a support bar 5, a waveguide 6, and a magnetron 7 corresponding to a microwave generating unit, A power supply 8 is provided. Further, the metal mesh 2 and the conductor plate 3 are combined to constitute a resonator 9 corresponding to a cavity constituting member. In FIG. 1, the metal mesh 2, the conductor plate 3, and the waveguide 6 are shown in a sectional view.

  The magnetron 7 converts the power energy supplied from the power source 8 into a microwave of 2.45 GHz, for example, and supplies it to the resonator 9 via the waveguide 6.

  The bulb 4 is formed into a substantially spherical shape with a transparent material such as quartz glass, for example. Inside the bulb 4 is a discharge gas containing a metal vapor such as mercury vapor or a rare gas such as Ar gas. Is enclosed. The inner wall of the bulb 4 is coated with a phosphor that converts ultraviolet light into visible light. As a result, when an electromagnetic field is applied to the bulb 4, the discharge gas sealed in the bulb 4 is excited by the electromagnetic field to emit ultraviolet rays, and the ultraviolet rays are converted into visible light by the phosphor, and the bulb 4 emits light. To do.

  The metal mesh 2 is, for example, a hemispherical mesh net having a diameter of 165 mm, and the opening of the metal mesh 2 is closed by a substantially disc-shaped conductor plate 3. Further, the mesh size of the metal mesh 2 is made smaller than the wavelength of the microwave supplied from the magnetron 7, and the microwave supplied to the internal space of the resonator 9 is prevented from being released to the external space. In addition, the aperture ratio is made as large as possible so that the light emitted from the bulb 4 can be radiated to the outside as much as possible. The metal mesh 2 is not limited to a wire mesh, and may be a screen that suppresses transmission of microwaves and transmits visible light.

  The conductor plate 3 is a substantially disk-shaped metal plate, for example, and the waveguide 6 is connected to the side on which the metal mesh 2 is attached. A coupling window 10 corresponding to an introduction part for introducing the microwave supplied from the magnetron 7 through the waveguide 6 into the internal space of the resonator 9 is provided at a substantially central part of the conductor plate 3. ing. For example, the other end portion of the columnar support rod 5 to which the valve 4 is attached at one end portion is fixedly erected on the metal mesh 2 side of the conductor plate 3, and the valve 4 is installed in the internal space of the resonator 9. Is arranged.

The resonator 9 has a predetermined size and a coupling window 10, and resonates the microwave introduced from the magnetron 7 into the internal space through the waveguide 6 and the coupling window 10. Energy is generated to generate an electric field of TE011 mode, and the bulb 4 is caused to emit light by the energy of the electric field. Specifically, assuming that the wavelength of the microwave is λ and the radius of the resonator 9 is a, in the case of a hemispherical resonator such as the resonator 9, the condition for generating the electric field of the TE011 mode is
λ = 1.395 × a (1)
It becomes.

  Here, if the microwave frequency is 2.45 GHz, λ≈122 mm and a≈87 mm. In this case, however, the radius a of the resonator 9 is generally smaller than 87 mm due to the wavelength shortening effect by the dielectric such as the bulb 4 inside the resonator 9. Note that the shape of the resonator 9 is not limited to a hemispherical shape as long as the condition for generating the electric field of the TE011 mode is satisfied, and may be, for example, a hemispherical shape, a semi-elliptical spherical shape, or a curved shape that is a part thereof. Good.

  Next, the operation of the microwave electrodeless discharge lamp device 1 configured as described above will be described. First, when power is supplied from the power supply 8 to the magnetron 7, a 2.45 GHz microwave is output from the magnetron 7 to the internal space of the resonator 9 through the waveguide 6 and the coupling window 10. Then, the resonator 9 resonates the microwave of 2.45 GHz, and generates an electric field of TE011 mode.

  FIG. 3 is a diagram showing an electric field 11 of the TE011 mode generated in the internal space of the resonator 9. In FIG. 3, the electric field 11 in the TE011 mode is not orthogonal to the metal mesh 2 as indicated by an arrow. Thereby, the induced current flowing through the metal mesh 2 does not increase, and deterioration of the metal mesh 2 can be reduced. Further, the electric field 11 is orthogonal to the conductor plate 3 as indicated by an arrow, and the induced current flowing through the conductor plate 3 increases. However, since the conductor plate 3 is made of a metal plate having a large current capacity, deterioration due to the induced current is reduced. Thereby, the resonator 9 composed of the metal mesh 2 and the conductor plate 3 is reduced from being deteriorated by the induced current, and the life of the resonator 9 can be extended.

  As an experimental example, the inventor has a radius of the resonator 9 of about 82.5 mm (diameter 165 mm), and the metal mesh 2 has an aperture ratio of 81% (mesh size 1.8 × 1.8 mm, wire diameter φ0.2 mm). In addition, 5 mg of rare earth metal halide, 10 mg of alkali metal halide, 30 mg of Hg, and Ar30torr were enclosed as a bulb 4 having a diameter of 27 mm (thickness 2 mm) as a quartz bulb. Then, the bulb 4 was placed at a location where a strong electric field was generated due to resonance in the resonator 9, and a lighting experiment was performed. In this case, it was confirmed that high intensity metal luminescence can be obtained when thermally stabilized.

(Second Embodiment)
Next, a microwave electrodeless discharge lamp apparatus according to a second embodiment of the present invention will be described. FIG. 4 is a diagram showing an example of the configuration of the microwave electrodeless discharge lamp device according to the second embodiment of the present invention. The microwave electrodeless discharge lamp apparatus 1a shown in FIG. 4 is different from the microwave electrodeless discharge lamp apparatus 1 shown in FIG. 1 in the following points. That is, in the microwave electrodeless discharge lamp apparatus 1a shown in FIG. 4, the coupling window 10 is not provided in the conductor plate 3a, and the loop antenna 12 corresponding to the introduction portion is disposed on the metal mesh 2 side of the conductor plate 3a. Has been. The loop antenna 12 and the waveguide 6 are electrically connected by a coaxial cable 13. As a result, the microwave generated by the magnetron 7 is guided to the loop antenna 12 via the waveguide 6 and the coaxial cable 13, and is output to the internal space of the resonator 9 by the loop antenna 12.

  Since the other configuration is the same as that of the microwave electrodeless discharge lamp device 1 shown in FIG. 1, the description thereof will be omitted, and the operation of the microwave electrodeless discharge lamp device 1 a thus configured will be described below. First, when power is supplied from the power supply 8 to the magnetron 7, a 2.45 GHz microwave is output from the magnetron 7 to the internal space of the resonator 9 via the waveguide 6, the coaxial cable 13, and the loop antenna 12. Is done. Then, 2.45 GHz microwaves are resonated by the resonator 9, and an electric field 11 of TE011 mode is generated in the internal space of the resonator 9, as shown in FIG.

  Accordingly, as in the microwave electrodeless discharge lamp apparatus 1 shown in FIG. 1, the TE011 mode electric field 11 is not orthogonal to the metal mesh 2 as shown by the arrow in FIG. Can be reduced. The electric field 11 is orthogonal to the conductor plate 3a as shown by the arrow, and the induced current flowing through the conductor plate 3a increases. However, since the conductor plate 3a is composed of a metal plate having a large current capacity, the induced current It is possible to reduce deterioration due to. Thereby, the resonator 9 composed of the metal mesh 2 and the conductor plate 3a is reduced from being deteriorated by the induced current, and the life of the resonator 9 can be extended.

  Further, in the microwave electrodeless discharge lamp apparatus 1a shown in FIG. 4, the waveguide 6 and the resonator 9 are connected by the coaxial cable 13 that can be flexibly bent. Therefore, the degree of freedom of arrangement with respect to the waveguide 6 can be increased. The loop antenna 12 is not limited to a loop-shaped antenna, and may be another antenna.

(Third embodiment)
Next, a microwave electrodeless discharge lamp apparatus according to a third embodiment of the present invention will be described. FIG. 6 is a diagram showing an example of the configuration of a microwave electrodeless discharge lamp device according to a third embodiment of the present invention. The microwave electrodeless discharge lamp device 1b shown in FIG. 6 differs from the microwave electrodeless discharge lamp device 1 shown in FIG. 1 in the following points. That is, in the microwave electrodeless discharge lamp device 1b shown in FIG. 6, a substantially disc-shaped reflector 14 having a thickness of 3 mm, for example, is fixed to the metal mesh 2 side of the conductor plate 3. The reflector 14 is made of a dielectric material such as alumina, and reflects visible light emitted from the bulb 4. The resonator 9 has a diameter of 155 mm, for example.

  Since the other configuration is the same as that of the microwave electrodeless discharge lamp device 1 shown in FIG. 1, the description thereof will be omitted, and the operation of the microwave electrodeless discharge lamp device 1b shown in FIG. explain. First, when power is supplied from the power supply 8 to the magnetron 7, a 2.45 GHz microwave is output from the magnetron 7 to the internal space of the resonator 9 through the waveguide 6, the coupling window 10, and the reflector 14. Is done. Then, the microwave of 2.45 GHz is resonated by the resonator 9, and the electric field 11 of the TE011 mode is generated in the internal space of the resonator 9 in the same manner as in the microwave electrodeless discharge lamp device 1 shown in FIG. To do.

  In this case, when the microwave output from the magnetron 7 passes through the reflector 14 made of a dielectric, the thickness of the reflector 14 as viewed from the microwave increases due to the wavelength shortening effect of the dielectric. The diameter of the resonator 9 viewed from the microwave is also increased. Therefore, the actual diameter of the resonator 9 that is a condition for generating the electric field of the TE011 mode can be made smaller than the diameter obtained by the equation (1), and the resonator 9 can be downsized. .

  Further, the coupling window 10 is shielded by the reflecting plate 14 and the visible light emitted from the bulb 4 is prevented from leaking out of the resonator 9 from the coupling window 10, so that the light emission efficiency of the resonator 9 is improved. Can be made.

(Fourth embodiment)
Next, a microwave electrodeless discharge lamp apparatus according to a fourth embodiment of the present invention will be described. FIG. 7 is a diagram showing an example of the configuration of a microwave electrodeless discharge lamp device according to a fourth embodiment of the present invention. The microwave electrodeless discharge lamp device 1c shown in FIG. 7 is different from the microwave electrodeless discharge lamp device 1b shown in FIG. 6 in the following points. That is, in the microwave electrodeless discharge lamp device 1c shown in FIG. 7, the reflecting plate 14 is supported at a position separated by, for example, 5 mm from the surface of the conductor plate 3 by a columnar column 15 erected on the conductor plate 3, for example. Has been.

  Since the other configuration is the same as that of the microwave electrodeless discharge lamp device 1b shown in FIG. 6, the description thereof will be omitted. Hereinafter, the operation of the microwave electrodeless discharge lamp device 1c shown in FIG. explain. First, when power is supplied from the power supply 8 to the magnetron 7, a 2.45 GHz microwave is output from the magnetron 7 to the internal space of the resonator 9 through the waveguide 6, the coupling window 10, and the reflector 14. Is done. Then, the microwave of 2.45 GHz is resonated by the resonator 9, and the electric field 11 of the TE011 mode is generated in the internal space of the resonator 9 as in the case of the microwave electrodeless discharge lamp device 1 b shown in FIG. To do.

  In this case, since the electric field intensity level is very high in the vicinity of the coupling window 10, the reflector 14 is disposed at a position in close contact with the coupling window 10 as in the microwave electrodeless discharge lamp device 1b shown in FIG. As a result, the dielectric is placed at a position where the electric field strength level is very high. As a result, the dielectric loss due to the reflector 14 increases, and the loss of microwave energy increases. On the other hand, in the microwave electrodeless discharge lamp device 1 c shown in FIG. 7, since the reflecting plate 14 is disposed at a position 5 mm away from the surface of the conductor plate 3, the reflecting plate 14 has an electric field near the coupling window 10. As a result of avoiding the position where the intensity level is very high, the dielectric loss due to the reflector 14 is reduced, and the loss of microwave energy can be reduced.

(Fifth embodiment)
Next, a microwave electrodeless discharge lamp device according to a fifth embodiment of the present invention will be described. FIG. 8 is a diagram showing an example of the configuration of a microwave electrodeless discharge lamp device according to a fifth embodiment of the present invention. The microwave electrodeless discharge lamp device 1d shown in FIG. 8 is different from the microwave electrodeless discharge lamp device 1c shown in FIG. 7 in the following points. That is, in the microwave electrodeless discharge lamp apparatus 1d shown in FIG. 8, the coupling window 10 is not provided in the conductor plate 3a, and the loop antenna 12 is provided in the space between the conductor plate 3a and the reflecting plate 14. ing. The loop antenna 12 and the waveguide 6 are electrically connected by a coaxial cable 13. As a result, the microwave generated by the magnetron 7 is guided to the loop antenna 12 via the waveguide 6 and the coaxial cable 13. Then, the microwave output by the loop antenna 12 passes through the reflector 14 and is output to the internal space of the resonator 9.

  Since the other configuration is the same as that of the microwave electrodeless discharge lamp device 1c shown in FIG. 7, the description thereof will be omitted, and the operation of the microwave electrodeless discharge lamp device 1d thus configured will be described below. First, when power is supplied from the power source 8 to the magnetron 7, the 2.45 GHz frequency is supplied from the magnetron 7 to the internal space of the resonator 9 through the waveguide 6, the coaxial cable 13, the loop antenna 12, and the reflector 14. Microwave is output. Then, a microwave of 2.45 GHz is resonated by the resonator 9, and a TE011 mode electric field 11 is generated in the internal space of the resonator 9 as in the case of the microwave electrodeless discharge lamp device 1 c shown in FIG. 7. .

  In this case, since the reflecting plate 14 is disposed between the bulb 4 and the loop antenna 12 so as to be separated from the conductor plate 3, the visible light emitted from the bulb 4 is reflected without reaching the loop antenna 12. Therefore, the light is not scattered by the loop antenna 12, and therefore the loss due to the scattering of visible light emitted from the bulb 4 can be reduced, and the light emission efficiency of the microwave electrodeless discharge lamp device 1d can be improved.

  Further, in the microwave electrodeless discharge lamp apparatus 1d shown in FIG. 8, the waveguide 6 and the resonator 9 are connected by the coaxial cable 13 that can be flexibly bent. Therefore, the degree of freedom of arrangement with respect to the waveguide 6 can be increased.

(Sixth embodiment)
Next, a microwave electrodeless discharge lamp apparatus according to a sixth embodiment of the present invention will be described. FIG. 9 is a diagram showing an example of the configuration of a microwave electrodeless discharge lamp device according to a sixth embodiment of the present invention. The microwave electrodeless discharge lamp device 1e shown in FIG. 9 is different from the microwave electrodeless discharge lamp device 1b shown in FIG. 6 in the following points. That is, in the microwave electrodeless discharge lamp device 1e shown in FIG. 9, the recess 3c is provided in the substantially central portion of the conductor plate 3b. And the joint window 10 is provided in the bottom face part of the recessed part 3c.

  Since the other configuration is the same as that of the microwave electrodeless discharge lamp device 1b shown in FIG. 6, the description thereof will be omitted. Hereinafter, the operation of the microwave electrodeless discharge lamp device 1e shown in FIG. explain. First, when power is supplied from the power supply 8 to the magnetron 7, a 2.45 GHz microwave is output from the magnetron 7 to the internal space of the resonator 9 via the waveguide 6, the coupling window 10, and the reflector 14. Is done. Then, a microwave of 2.45 GHz is resonated by the resonator 9, and a TE011 mode electric field 11 is generated in the internal space of the resonator 9 in the same manner as in the microwave electrodeless discharge lamp device 1b shown in FIG. To do.

  In this case, since the coupling window 10 provided on the bottom surface of the recess 3c and the reflecting plate 14 are arranged apart from each other, the reflecting plate is provided in the same manner as in the microwave electrodeless discharge lamp device 1c shown in FIG. 14 is arranged avoiding a position where the electric field intensity level near the coupling window 10 is very high. As a result, the dielectric loss due to the reflector 14 is reduced, and the loss of microwave energy can be reduced.

It is a fragmentary sectional view showing an example of composition of a microwave electrodeless discharge lamp device concerning a 1st embodiment of the present invention. It is an external appearance perspective view of the microwave electrodeless discharge lamp apparatus shown in FIG. FIG. 2 is a partial cross-sectional view showing a TE011 mode electric field generated in the internal space of the resonator shown in FIG. 1. It is a fragmentary sectional view which shows an example of a structure of the microwave electrodeless discharge lamp apparatus by the 2nd Embodiment of this invention. FIG. 5 is a partial cross-sectional view showing a TE011 mode electric field generated in the internal space of the resonator shown in FIG. 4. It is a fragmentary sectional view which shows an example of a structure of the microwave electrodeless discharge lamp apparatus by the 3rd Embodiment of this invention. It is a fragmentary sectional view which shows an example of a structure of the microwave electrodeless discharge lamp apparatus by the 4th Embodiment of this invention. It is a fragmentary sectional view which shows an example of a structure of the microwave electrodeless discharge lamp apparatus by the 5th Embodiment of this invention. It is a fragmentary sectional view showing an example of composition of a microwave electrodeless discharge lamp device by a 6th embodiment of the present invention. It is a side view of the cavity structural member in the microwave electrodeless discharge lamp apparatus using the cylindrical cavity structural member by a prior art example. It is sectional drawing of the cavity structural member in the microwave electrodeless discharge lamp apparatus using the cavity structural member which covered the opening part of the reflective mirror formed in the bowl shape by a prior art example with the mesh-shaped metal mesh.

Explanation of symbols

1, 1a, 1b, 1c, 1d, 1e Microwave electrodeless discharge lamp device 2 Metal mesh 3, 3a, 3b Conductor plate 3c Recess 4 Bulb (light emitting part)
5 Support rod 6 Waveguide 7 Magnetron (microwave generator)
8 Power supply 9 Resonator (cavity component)
10 Connecting window (introduction part)
11 Electric field 12 Loop antenna (introduction part)
13 Coaxial cable 14 Reflector 15 Post

Claims (3)

A cavity generating member that includes a microwave generating unit that generates a microwave, an introduction unit that introduces the microwave generated by the microwave generating unit, and that prevents the microwave from being emitted to an external space; and the cavity In a microwave electrodeless discharge lamp device comprising a light emitting unit that is arranged in an internal space of a component member and emits light by a microwave generated by the microwave generating unit,
The hollow component has a hemispherical shape, a semi-elliptical spherical shape, or a curved surface portion that is a part of the hemispherical or semi-elliptical spherical shape, and a rear side of the light emitting portion is formed by a conductor plate. Is a shell-like shape that is a flat shape,
At least a part of the curved surface-shaped portion of the hollow component member is to transmit visible light emitted from the light emitting unit,
The microwave electrodeless discharge lamp device according to claim 1, wherein the hollow component member is configured to change a microwave electromagnetic field mode generated by the microwave generation unit in an internal space of the hollow component member to TE011. The microwave electrodeless discharge lamp according to claim 1, further comprising a reflector made of a dielectric that reflects visible light emitted from the light emitting unit, between the light emitting unit and the introducing unit. apparatus. The microwave electrodeless discharge lamp device according to claim 2, wherein the reflecting plate is disposed apart from the conductor plate.

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