JP2006147454A - Electrodeless discharge lamp device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently carry out electric power supply to an arc tube, and improve performances for a practical usage including starting characteristics and controllability in an electrodeless discharge lamp device. <P>SOLUTION: The electrodeless discharge lamp device 1 is provided with a power supply part 2 for generating an electromagnetic wave, an arc tube 3 to emit light by electrodeless discharge light emission, and an electromagnetic wave irradiation part 4 including an exciter for introducing the electromagnetic wave into the arc tube. A reflective wave detecting means 6 to connect the power supply part 2 and the electromagnetic wave irradiation part 4 by using a coaxial tube or a coaxial cable and to wave-detect the reflected wave which spreads from the arc tube 3 to the power supply part 2 side, and an output adjusting means 7 to adjust the output of the power supply part 2 in order to minimize a reflection loss based on measurement information from the reflective wave detecting means 6 are installed. Efficiency is enhanced by reducing the reflection loss, and rising characteristics of a luminous flux can be made superior. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technique for improving efficiency, lighting performance, and the like in an electrodeless discharge lamp apparatus having no electrode in an arc tube.

  An electrodeless discharge lamp having no electrode in the discharge space is known, and has features such as high efficiency and long life, and research and development as a high-intensity discharge lamp has been actively conducted in recent years.

  In the case of an electrodeless discharge lamp, there is no limitation on the lamp life due to exhaustion of the filament or electrode, there is no heat loss from the electrode, and there is no limitation on the enclosure in the arc tube (the enclosure and electrode material). It is not necessary to consider this reaction.), And a light-emitting substance suitable for improving efficiency can be used.

  Examples of a method for lighting an electrodeless discharge lamp, that is, a method for introducing electromagnetic waves into an arc tube include a method using a cavity resonator, a method using inductive coupling, and a method using surface waves.

  By the way, there is a difficult problem to be solved for practical use in order to realize a small light source that requires light distribution control, such as lighting for automobiles. For example, in a method using a cavity resonator, when an electromagnetic wave (microwave) is oscillated by a magnetron and an electrodeless discharge tube in the cavity resonator is caused to emit light through a waveguide, the minimum dimension of the cavity resonator is used. Is determined in principle by the frequency of electromagnetic waves (for example, at a frequency of 2.45 GHz (wavelength 122 mm), the cavity length is 61 mm, which corresponds to a half wavelength, and the discharge tube is capable of maintaining stable discharge. The length is 15 mm or more).

  In addition, it is necessary to solve the problem of electromagnetic noise generated accompanying the use of high-frequency current, and the method of installing an electromagnetic shielding means (for example, a wire mesh etc.) reduces efficiency and deteriorates light distribution performance. There are concerns about the impact. That is, it is desirable not to arrange a shield, a coil, or the like that blocks light around the discharge tube.

  In order to excite the luminescent material in the arc tube, as a configuration of a small and highly efficient electrodeless discharge lamp that meets such requirements, a locally strong high-frequency electric field is applied from the slit formed at the end of the coaxial tube. There has been known a lamp that generates a shielding effect of electromagnetic waves using surface wave plasma that is generated and excited thereby (see, for example, Patent Document 1). Since the coaxial tube is not limited in size by frequency (also referred to as having no cutoff frequency), an arc tube having the same size as the diameter of the coaxial tube can be used.

JP 2003-197156 A

  However, a problem with the conventional configuration is that sufficient measures are not taken to efficiently supply power to the arc tube. For example, the following problems occur when the reflection loss of electromagnetic waves is large.

・ When the impedance matching is fixed according to the steady lighting state of the arc tube, if the reflection is large when the luminous flux rises, it takes time to rise (deterioration of startability)
-When the arc tube deviates from the impedance matching in the initial setting state due to the change with time or characteristic of the arc tube, the reflection loss increases and the efficiency decreases.

  Note that “impedance matching” means that the output impedance of the power source and the impedance of the arc tube are matched, and the reflected wave can be reduced by adjusting the matching state appropriately.

  Further, in the practical application of electrodeless discharge lamps, there is a problem that power output cannot be stopped when it is impossible to detect, for example, lamp extinction or lighting failure.

  Therefore, an object of the present invention is to efficiently supply power to the arc tube in an electrodeless discharge lamp device, and to improve performance for practical use including startability and controllability.

  The present invention includes a power source for generating electromagnetic waves, an arc tube that emits light without electrode by discharge light emission, and an electromagnetic wave irradiation unit that includes excitons for introducing electromagnetic waves into the arc tube, and a coaxial tube or coaxial cable In the configuration in which the power supply unit and the electromagnetic wave irradiation unit are connected using the reflection wave detecting means for detecting the reflected wave propagating from the arc tube to the power supply part side, and the reflection loss based on the measurement information from the reflected wave detecting means Output adjusting means for adjusting the output of the power supply unit to minimize the power.

  Therefore, in the present invention, it is possible to efficiently supply power to the arc tube by detecting the reflected wave and reducing the reflection loss to the minimum.

  According to the present invention, it is possible to provide a small light source that is easy to control light distribution, has high efficiency, and has no problems such as electromagnetic noise radiation and electromagnetic interference, and has improved performance including startability and controllability. This is effective for stabilizing lighting.

  In addition, by defining that the length of the portion including the coaxial tube or the coaxial cable and the electromagnetic wave irradiation portion is an integral multiple of a quarter of the oscillation wavelength related to the power output or a value close thereto, the arc tube The electric field applied to the exciton tip in a state where it is not lit becomes a maximum value or a substantially maximum value, which contributes to a reduction in the size of the starting means or can be eliminated.

  In order to shorten the rise time of the luminous flux in application to vehicle lamp lighting, etc., the duty ratio of the power supply output by pulse oscillation is increased at the time of rise, and the duty ratio is reduced as the light output rises so that the steady lighting state is achieved. Control to shift to is preferable.

  In addition, when the reflected wave detection means detects the generation or increase of the reflected wave after the arc tube is lit, the power supply unit stops the power supply. Thus, the power supply can be shut down, and the continuation of useless power-on operation can be avoided. And the leakage time of electromagnetic waves, such as a microwave, can be minimized, and the influence on a human body etc. can be suppressed to the minimum.

  INDUSTRIAL APPLICABILITY The present invention can be applied to an illumination light source directed in a specific target direction, that is, a light source for uses that require light distribution control. For example, in light sources for vehicle headlamps and sign lights, light sources such as road lighting and traffic lights, store display lighting, light sources for projector devices, etc., the size of the light emitting part is reduced, the luminance is increased, the luminance distribution is made uniform, etc. Can be provided, and it is possible to provide a configuration that is a small light source such as a cylinder or a dot (or a sphere), and does not include a member that shields or diffuses light around the light source.

  FIG. 1 is an explanatory view showing a basic configuration example of an electrodeless discharge lamp device according to the present invention.

  The electrodeless discharge lamp device 1 includes a power supply unit 2 for generating electromagnetic waves, an arc tube 3 that emits light without electrodes by discharge light emission, and an electromagnetic wave irradiation unit 4 including excitons for introducing electromagnetic waves into the arc tube. .

  The power supply unit 2 includes, for example, an oscillation unit that generates electromagnetic waves in the microwave band (1 to 100 GHz) and uses a magnetron. However, the present invention is not limited to this, and a semiconductor switching element (such as an FET or a bipolar transistor) is used. It is possible to use a high-frequency amplifier device or the like that is used.

The arc tube 3 is formed in a hollow cylindrical shape using, for example, quartz, and a predetermined encapsulating substance (a gas such as xenon or argon, a metal iodide such as NaI or ScI ₃ , a metal bromide, or the like) is contained therein. Is filled. Moreover, the form which apply | coats a fluorescent substance to the arc_tube | light_emitting_tube inner surface as needed is possible.

  The electromagnetic wave irradiation unit 4 has a function as a launcher for introducing electromagnetic waves into the arc tube 3, and the arc tube 3 is attached to the end of the electromagnetic wave irradiation unit 4. A coaxial tube or a coaxial cable is used for the waveguide connection means 5 that connects the electromagnetic wave irradiation unit 4 and the power supply unit 2. For example, when flexibility in arrangement is taken into consideration, a flexible material may be used. preferable.

  A reflected wave detecting means 6 is provided on the coaxial line, and detects a reflected wave propagating from the arc tube 3 to the power supply unit 2 side. Then, the measurement result is sent to the output adjustment means 7.

  The output adjusting means 7 adjusts the output of the power supply unit 2 to minimize the reflection loss by adjusting the impedance matching based on the measurement information from the reflected wave detecting means 6. In other words, in the configuration in which the power supply unit 2 and the electromagnetic wave irradiation unit 4 are connected using a coaxial tube or a coaxial cable, the level of the reflected wave becomes large as it is in the case of a high frequency, and the luminous tube 3 cannot be efficiently supplied with power. An increase in power loss becomes a problem. Therefore, power is supplied to the arc tube 3 by suppressing reflected waves using a device for impedance matching between the power supply unit 2 and the arc tube 3 (for example, a matching device using a sleeving tuner or the like). Can be performed efficiently. Specifically, the LC component of the waveguide circuit (L: inductive component, C: capacitive component) is adjusted based on the detection information of the reflected wave so that the reflection loss is minimized (the reflected wave is sufficiently reduced). Matching is made between the output impedance of the power supply unit 2 and the impedance of the arc tube 3.

  For example, in a configuration in which an exciter is connected to an arc tube through a magnetron, an isolator, an attenuator, a directional coupler, a sli tab tuner, a coaxial waveguide converter, and a coaxial tube in this order, a slot antenna is provided at the end of the coaxial tube. Is located (this portion is called “exciton”), and the arc tube is fixed thereto. The isolator serves to prevent the reflected wave from returning to the magnetron, and the directional coupler is a device for allowing the electromagnetic wave to travel only in one direction.

  A strong high-frequency electric field generates high-density plasma in the arc tube and shifts to a lighting state, and the high-frequency electric field from the coaxial tube becomes a traveling wave and is introduced into the arc tube, so that lighting continues.

  Since a high-frequency electric field is not allowed to enter the high-density plasma (the density at this time is called “blocking density”), the high-frequency electric field becomes a surface wave mode between the arc tube, which is a dielectric, and the plasma. It propagates while generating plasma (this is called "surface wave plasma").

  Even when a high-frequency electric field is applied only to a part of the arc tube, plasma is uniformly generated in the arc tube by surface wave plasma. Therefore, if the arc tube is defined in a shape required for light distribution control, the plasma is generated. Light emission in the entire shape is possible. That is, a light source suitable for light distribution control is obtained.

  Moreover, in a normal discharge tube having an electrode, the vapor pressure of the luminescent material and thus the amount of luminescence is determined by the low temperature part (the base part of the electrode, the lower part of the arc tube, etc.), so that the efficiency limit is limited. Naturally, in the form using surface wave plasma, plasma is uniformly generated in the arc tube, and the temperature distribution in the arc tube becomes uniform, contributing to the improvement of efficiency.

  A semiconductor element such as a diode is used to detect electromagnetic waves in the coaxial line, and incident waves and reflected waves can be measured by the detected current. For example, each detector element for incident and reflection is attached to a directional coupler, and impedance matching is adjusted based on the detection result, so that in a transition period from the start of lighting of the arc tube to steady lighting. Electric power can be supplied to the arc tube without loss. In addition, it is possible to realize efficient and stable lighting by suppressing reflection loss with respect to characteristic changes caused by aging and life.

  In the example of FIG. 1, the power supply unit 2 and the output adjustment unit 7 are illustrated separately. However, the present invention is not limited to this, and the configuration in which the output adjustment unit 7 is included in the power supply unit (that is, the power supply unit itself is included). It has an output adjustment and control function).

  For example, in the configuration example 1A shown in FIG. 2, the exciter 9 and the power supply unit 2 are connected using the coaxial cable 8, and the output adjustment unit 10 (including the impedance matching unit) is provided in the power supply unit 2. It has been. Then, measurement information from the reflected wave detector 11 located near the exciton 9 is sent to the output adjustment unit 10.

  Thus, in the configuration in which the reflected wave detection means is provided in the vicinity of the excitons or the excitons and the reflected wave detector are integrated, the detection accuracy can be sufficiently ensured.

  Further, as shown in FIG. 3, in the configuration example 1B in which the power supply unit 2 and the reflected wave detector 11 are integrated, it is not necessary to arrange the reflected wave detector near the exciter 9, and the arrangement of the light source unit is eliminated. High degree of freedom. Alternatively, it is possible to implement in various forms such as arranging one or a plurality of reflected wave detectors at intermediate positions on the coaxial tube or the coaxial cable as necessary.

  In application to a vehicle headlamp or the like, it is required to shorten the rise time of the light beam. However, the reflected wave detector 11 can be used to control the reflection loss at the time of rise as much as possible. preferable.

  In addition, a starting circuit (so-called starter) including a step-up transformer is provided in a lighting circuit for a discharge lamp having an electrode. However, since the circuit scale is increased and costs are increased, it is required to reduce or eliminate the scale of the means. It is done.

  Therefore, it is preferable to define the length of the coaxial line so that the electric field is maximized at the boundary between the arc tube and the electromagnetic wave irradiation unit in a state before lighting.

  In FIG. 4, the upper diagram shows the relationship between the horizontal axis with the position on the coaxial line and the vertical axis with the electric field, and “λ / 2” indicates the wavelength of the standing wave ( “Λ” indicates the oscillation wavelength.) And in the lower figure, the coaxial cable 8 (or coaxial tube), the electromagnetic wave irradiation part 4, and the arc tube 3 are shown.

  When the length of the portion including the coaxial tube or the coaxial cable and the electromagnetic wave irradiation portion is denoted as “L”, “L = (λ / 4) · m” (where m is a natural number variable, m = 1, 2). If the relationship of... Is satisfied, the electric field shows the maximum amplitude value at the boundary position between the exciton and the arc tube (standing wave antinode). That is, if the length L is defined so as to be an integral multiple of one quarter of the oscillation wavelength or a value close to it, the electric field applied to the tip of the exciton when the arc tube is not lit is maximized or almost maximized. Value.

  With such a design, it is possible to reduce or eliminate the scale of the starting means, and it is possible to simplify the configuration and reduce the cost.

  In order to shorten the rise time of the luminous flux at the time of starting the electrodeless discharge lamp, it is preferable to change the duty ratio (or duty cycle) in the pulse oscillation of the power supply unit to control the input power at the rise.

  5A schematically shows the rising characteristics when the duty ratio is controlled in FIG. 5A, and FIG. 5B schematically shows the rising characteristics when the duty ratio is fixed (control with constant power). It is a thing. In each figure, the horizontal axis represents time (t), and the vertical axis represents the light output on the left side and the duty ratio on the right side. “Ta” and “tb” indicate times when the optical output reaches a predetermined range with reference to the rated value or steady value (“ta <tb”).

  (A) In the figure, after the duty ratio of the power supply output by pulse oscillation is temporarily increased at the time of start-up, the duty ratio is decreased as the light output increases, and the control for shifting to the steady lighting state is performed according to the predetermined output. This is performed by control means (including a PWM (pulse width modulation) circuit and the like). Therefore, in the period “0 ≦ t <ta”, the light output rapidly rises, and the light output gradually approaches a constant value and saturates after the time ta is exceeded.

  On the other hand, as shown in FIG. 5B, when the input power is controlled at a constant value (rated value or steady value) from the start of startup, the light output increases during the period “0 ≦ t <tb”. It takes time, so the rise of the luminous flux is delayed.

  FIG. 6 is a graph illustrating the relationship between the duty ratio on the horizontal axis and the relative value of light output (value expressed as a percentage when the duty ratio is 100% as 100) on the vertical axis. is there. It can be seen that the light output increases as the duty ratio increases.

  Such characteristics can be used to improve the rising characteristics as described above, or to perform dimming in a steady lighting state.

  FIG. 7 exemplifies changes in power output and optical output over time.

  The duty ratio is expressed as “(Ton / (Ton + Toff)) × when the length of the on-period (or the power-on period) is denoted as“ Ton ”and the length of the off-period (or the power-off period) is denoted as“ Toff ”. It is expressed as a percentage by “100”, but attention should be paid to the existence of an upper limit value for Toff. That is, if the value of Toff is not less than 1 millisecond, which is the lifetime of plasma afterglow (a phenomenon in which plasma is maintained even after the power is shut off), it will cause flickering due to fluctuations in the light output (the large circle frame in FIG. 7). As shown in the enlarged view, the amount of change “Δ” increases when Toff is long.)

  Note that the variable control of the duty ratio is also effective for changes in light emission characteristics due to aging, lifespan, and the like.

  In addition, it is possible to reduce the rise time of the luminous flux by controlling the power output with little reflection loss by detecting the reflected wave. It is desirable to shut off.

  FIG. 8 schematically illustrates temporal changes in power output, reflected wave detection amount, and optical output.

  In the figure, time “t0” indicates the time when the power is turned on, “t1” indicates the time when the light is turned on, “t2” indicates the time when the extinction occurs, and “t3” indicates the time when the power is shut off.

  The reflected wave decreases or is not detected at the lighting time “t1” after the power is turned on, and the generation or increase of the reflected wave is detected at the time “t2” when the extinction occurs thereafter. In response to the detection result, the output control means shuts down the power supply.

  As described above, when the reflected wave detection means detects the occurrence or increase of the reflected wave after the arc tube is turned on, it is possible to shift to the output stop of the power supply unit for safety, noise countermeasures, power saving, etc. It is preferable in terms of

  9, FIG. 11 and FIG. 12 show examples of the shape of the arc tube and excitons.

  As shown in FIGS. 9 and 11, the arc tube 3 is formed in a cylindrical shape using quartz glass or the like. In FIG. 9, “L” indicates the length of the arc tube 3 in the central axis direction (for example, “L ≦ 7 (mm)”), and “M” indicates the outer diameter (for example, “M ≦ 5 ( mm) ").

  An annular slit 12 provided at the tip of the exciton is formed between an inner conductor 13 and an outer conductor 14 extending in a coaxial tube or a coaxial cable (“d” in FIG. 9 indicates the outer diameter of the slit 12). ) Shows that the arc tube 3 is irradiated with electromagnetic waves through the slit. That is, a portion where the slit 12 is formed functions as a slot antenna, and the radiated electromagnetic wave generates direct wave plasma or surface wave plasma near the wall in the arc tube, and excitation light emission of the encapsulated material is performed (in the plasma). This depends on the transition between the energy levels of the excited atoms.) Note that unnecessary electromagnetic waves (noise) can be sufficiently reduced by the shielding effect of the high-density plasma itself.

  However, it should be noted that when the positional relationship between the slit 12 and the arc tube 3 is not appropriate, leakage of electromagnetic waves may increase or the luminous efficiency may be reduced.

  In other words, the arc tube is attached to the tip (including excitons) by bonding or the like, but it is important to maintain the positional relationship between them appropriately. Specifically, when the inner diameter of the arc tube is denoted as “D” and the outer diameter of the slit is denoted as “d”, it is preferable that both values are as close as possible.

  FIG. 10 illustrates characteristics when the horizontal axis indicates the dimensional difference “D−d”, the vertical axis indicates the microwave leakage amount (arbitrary unit) on the left side, and the luminous efficiency (arbitrary unit) on the right side. FIG.

  As shown in the graph curve “ξ”, the microwave leakage amount is large in the negative region and sufficiently reduced in the region where “Dd” is zero or positive. I understand.

  On the other hand, as shown by the graph curve “η”, the luminous efficiency is large in the region near the center of “D = d”, and gradually decreases as “D−d” moves away from the origin in the negative value or positive value region. I understand that.

  Therefore, if the arc tube inner diameter D and the slit outer diameter d are equal or sufficiently close, the luminous efficiency can be increased and the microwave leakage amount can be sufficiently decreased.

  Regarding the relationship between the inner diameter D of the arc tube and the inner diameter of the slit 12, it is necessary to make the D value larger than the inner diameter of the slit. As shown by an arrow “α” in FIG. 9, there are two types of electromagnetic waves that are emitted directly into the discharge space and those that travel along the arc tube wall as indicated by a double-headed arrow “β”. Is smaller than the inner diameter of the slit, direct electromagnetic waves cannot enter the discharge space. Further, if the outer diameter of the arc tube is smaller than the outer diameter of the slit, electromagnetic waves are directly emitted to the outside of the arc tube, so that the condition of “outer diameter of arc tube> outer diameter of slit” needs to be satisfied.

  When the arc tube is attached to the exciton end, it is necessary to take heat insulation measures against heat transfer from the arc tube, and it is preferable to use a thermal insulating material.

  For example, as shown in configuration example 15 of FIG. 12, in an actual exciton, the inner conductor 13 is connected to one conductor (center conductor) 8a of the coaxial tube or the coaxial cable 8, and the outer conductor 14 is coaxial or coaxial. The other conductor (outer conductor) 8b of the cable 8 is connected. A dielectric 16 (polyethylene, glass fiber or the like) is filled between the center conductor and the outer conductor.

  For the cylindrical inner conductor 13, for example, a metal thin plate or foil plate on the outer peripheral surface of the base formed in a cylindrical shape using a dielectric 17 having excellent heat resistance and low thermal conductivity such as glass or ceramic. (Copper foil or the like) is attached or a metal film is formed. The one end portion 13a of the inner conductor 13 is formed in a flange shape bent outward.

  In addition, the outer conductor 14 having a cylindrical shape has an outer diameter larger than that of the inner conductor 13. For example, a dielectric 18 having excellent heat resistance and low thermal conductivity such as glass or ceramic is used. Then, a metal thin plate or a foil plate (copper foil or the like) is attached to the outer peripheral surface of the ring-shaped member, or a metal film is formed. Note that one end portion 14a of the outer conductor 14 is bent inward.

  A slit 12 is formed between one end 13 a of the inner conductor 13 and one end 14 a of the outer conductor 14.

  In addition, you may employ | adopt not only this example but the structure shown below.

In a configuration using only the dielectric 18, a metal foil plate or a metal film is formed on the outer peripheral surface side to form an external conductor, and an inner conductor is formed by attaching a metal foil plate or a metal film to the inner peripheral surface side. Form in which the inner conductor is formed by attaching a metal foil plate or metal film to the outer peripheral surface side in the configuration using only the dielectric 17 and the outer conductor is formed using a thin metal plate. Dielectric 17 , 18 without using the outer conductor and the inner conductor with a thin metal plate.

  Moreover, in the above-described example, a configuration in which one end portion in the central axis direction is coupled to an exciton using a cylindrical arc tube is shown, but the present invention is not limited thereto, and an exciton is formed on the outer peripheral surface of the arc tube. The structure etc. which couple | bonded these may be sufficient. In addition, a double tube structure such as a torus shape having a central hole or a structure in which a concave portion is formed in the center of a cylindrical shape may be used. However, when an arc tube is attached to the tip of a coaxial tube or a coaxial cable, A shape that can be reduced in size by reducing the diameter of the arc tube, such as a cylindrical straight tube, is preferable.

It is explanatory drawing of the basic structural example which concerns on this invention. It is a figure which shows an example of the structure form which concerns on this invention. It is a figure which shows another example of the structural form which concerns on this invention. It is a figure for demonstrating the relationship between the length of a coaxial line including an exciton, and a wavelength. It is a figure for demonstrating control of the duty ratio which concerns on power supply. It is the graph which illustrated the relation between duty ratio and light output. It is the figure which showed the time change of a power supply output and an optical output. It is the figure which illustrated the temporal relationship which concerns on a power supply output, reflected wave detection amount, and an optical output. It is a schematic sectional drawing which shows an arc tube and an exciton. It is a graph which shows the change of the amount of microwave leaks, and luminous efficiency at the time of changing the dimensional difference between an arc_tube | light_emitting_tube inner diameter and a slit outer diameter. It is a perspective view which shows an arc tube and an exciton. It is the schematic sectional drawing which illustrated the end part structure of a coaxial track.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 1A, 1B ... Electrodeless discharge lamp apparatus, 2 ... Power supply part, 3 ... Light-emitting tube, 4 ... Electromagnetic wave irradiation part, 5 ... Coaxial tube or coaxial cable, 6 ... Reflected wave detection means, 7 ... Output adjustment means, 8 ... coaxial cable, 9 ... exciton

Claims (4)

A power supply unit for generating electromagnetic waves, an arc tube that emits light without electrode by discharge light emission, and an electromagnetic wave irradiation unit that includes excitons for introducing electromagnetic waves into the arc tube, and using a coaxial tube or a coaxial cable In an electrodeless discharge lamp device having a configuration in which a power supply unit and the electromagnetic wave irradiation unit are connected,
A reflected wave detection means for detecting a reflected wave propagating from the arc tube to the power supply unit side;
An electrodeless discharge lamp apparatus comprising: an output adjusting unit that adjusts an output of the power source unit so as to minimize a reflection loss based on measurement information from the reflected wave detecting unit. In the electrodeless discharge lamp device according to claim 1,
The length of the portion including the coaxial tube or the coaxial cable and the electromagnetic wave irradiation unit is specified to be an integral multiple of one-fourth of the oscillation wavelength related to the power output or a value close thereto, and the arc tube is turned on. An electrodeless discharge lamp apparatus characterized in that the electric field applied to the tip of the exciton becomes a maximum value or a substantially maximum value in a state where the excitons are not formed. In the electrodeless discharge lamp device according to claim 1 or 2,
An electrodeless discharge lamp device characterized in that the output adjusting means increases the duty ratio of power supply output by pulse oscillation at the time of rising, and reduces the duty ratio as the light output increases to shift to a steady lighting state. In the electrodeless discharge lamp device according to claim 1 or claim 2 or claim 3,
The electrodeless discharge lamp device according to claim 1, wherein when the generation or increase of the reflected wave is detected by the reflected wave detection means after the arc tube is turned on, the power supply by the power supply unit is stopped.

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