JP2005122990A - Electrodeless discharge lamp lighting device and lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrodeless discharge lamp lighting device, capable of reducing noise with a simple structure, while being small and inexpensive. <P>SOLUTION: The electrodeless discharge lamp lighting device comprises a first capacitance element 6 connected to terminal parts 3a, 3b, to which high frequency is applied in an LC resonance circuit 19. A second capacitance element 7 is inserted between a conductor 4 communicating to the terminal part 2a of an induction coil 2 and the terminal part 3a. A third capacitance element 8 is inserted between a second conductor 5 communicating to the terminal part 2b of the induction coil 2 and the terminal part 3b. The second and the third capacitance elements have approximately the same capacity. Insulation bodies 4a, 5a, around the first and the second conductors 4, 5 have approximately the same thickness. Retaining means for maintaining approximately a fixed distance between the first conductor 4 and the second conductor 5 is provided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electrodeless discharge lamp lighting device that emits light by applying a high-frequency electromagnetic field to a bulb in which a discharge gas is sealed, and an illumination device using the same.

  As an example of a conventional electrodeless discharge lamp lighting device, there is one disclosed in, for example, Japanese Patent Publication No. 11-510646 (Patent Document 1) as shown in FIGS. In this conventional example, the induction coil 2 is accommodated in the cavity 111 of the electrodeless discharge lamp 1, and the induction coil is provided with first and second wound bodies 121 and 122 wound around the radiator 12. The first winding body 121 of the induction coil 2 is connected to the first and second conductors 131 and 132 of the cable 130. The second conductor 132 surrounds the first conductor 131 that is electrically insulated from the second conductor by the first insulating sheath 134. The first end 122a of the second winding body 122 is also connected to the second conductor 132, and the second end 122b of the second winding body is a free end. The power supply unit 105 is provided, and the first and second conductors 131 and 132 are connected to the first and second output terminals 151 and 152 of the power supply unit 105, respectively. The power supply unit 105 also has input terminals 153 and 154 for connection to the main poles P and N. During the operation of the power supply unit 105, a high-frequency potential difference is generated between the output terminals 151 and 152, and the second output terminal 152 does not change the high-frequency voltage with respect to the ground M. The electrodeless discharge lamp 1 is filled with a discharge gas containing at least mercury and a rare gas, and a phosphor 1a is coated on the inner surface thereof.

  The radiator 12 is capacitively coupled to the second conductor 132. As shown in FIG. 13, the capacitive coupling between the radiator 12 and the second conductor 132 is such that the radiator 12 is electrically insulated from the first and second conductors 131 and 132, and a part of the cable 3 is connected. Forming and connecting to the third conductor 133 surrounding the second conductor 132. The cable 130 has a second insulating sheath 135 between the second and third conductors 132 and 133. The third conductor 133 surrounded by the third insulating sheath 136 is grounded to the ground M at the end portion 133 ′. Thereby, on the one hand, the capacitive coupling between the second conductor 132 and the radiator 12 and on the other hand the capacitive coupling between the induction coil 2 and the second conductor 132, the induction coil 3 and the second conductor 132 are connected. It is considered that a parasitic current is generated between them, thereby suppressing the degree of high-frequency fluctuation of the average voltage over the induction coil surface, thereby reducing the strength of the electric field generated by the electrodeless discharge lamp lighting device. .

As for a specific configuration example of the power supply unit 105, for example, a series circuit of two switching elements is connected to a DC power supply, and the two switching elements are alternately turned on / off, so that a high frequency is connected to the connection point of the switching elements. A high-frequency power supply circuit that generates a voltage and generates an approximately sinusoidal high-frequency voltage by connecting an LC resonance circuit to the connection point of the switching element and supplies power to the induction coil of the electrodeless discharge lamp via a cable. Is disclosed in Patent Document 2.
Japanese National Patent Publication No. 11-510646 Japanese Patent Laid-Open No. 9-45488

  In the conventional electrodeless discharge lamp lighting device, in order to suppress the degree of high frequency fluctuation of the average voltage across the induction coil surface, it is necessary to provide a second winding body having a free end on the induction coil. The second wound body does not generate a high-frequency electromagnetic field that causes a high-frequency current generated by the power supply unit to flow and causes the electrodeless discharge lamp to emit light. That is, the second winding body is not for the original purpose of the electrodeless discharge lamp lighting device for emitting the electrodeless discharge lamp, but for reducing the generated voltage and noise.

  However, the 2nd winding body needs to be arrange | positioned in the vicinity of the 1st winding body from the objective. That is, it is disposed in the cavity 111 of the electrodeless discharge lamp. The cavity 111 of the electrodeless discharge lamp reaches the high temperature due to the heat of the plasma generated inside the electrodeless lamp. In our study, it was found that the temperature rose to around 200 ° C. The second wound body that can withstand such heat is expensive.

  In order to dissipate such heat outside the cavity, it is necessary to provide a radiator in the cavity, but in addition to the radiator and induction coil, a magnetic body that generates magnetic flux is required in the cavity. There is also a volume that each occupies. In addition, when the volume in the cavity is increased, there is a problem that the discharge volume and discharge path of the plasma in the electrodeless discharge lamp are changed and the luminous efficiency is lowered. That is, in the electrodeless discharge lamp lighting device, a means for reducing noise without disposing a second winding body that is not directly related to light emission of the electrodeless discharge lamp in the cavity is desirable.

  In order to reduce noise, it is desirable that the second winding body has a close coupling with the first winding body. For this reason, when the first winding body and the second winding body are alternately wound, the winding interval of the first winding body that generates a high-frequency electromagnetic field that causes the electrodeless discharge lamp to emit light becomes sparse, The coupling with plasma is lowered, and the luminous efficiency of the electrodeless discharge lamp lighting device is lowered.

  Furthermore, in order to obtain high luminous efficiency in the electrodeless discharge lamp lighting device, it is desirable that the loss of the induction coil and the power supply unit be as small as possible. For this reason, the Q value of the system through which the high-frequency current of the induction coil and the power supply unit flows increases. This is conspicuous at the time of starting to fire from the time when the electrodeless discharge lamp is turned on. Since the Q value of the system is large, the characteristics of the power supply unit change more greatly than a general inverter circuit with respect to variations in the values of reactance elements. If the second winding body is provided in the induction coil as in the configuration of the conventional example, the inductance value of the induction coil may be increased, which causes the characteristics of the power supply unit and the electrodeless discharge. The characteristics of the lighting device will vary greatly.

  In addition, although the output potential of the power supply unit is applied between the terminals of the induction coil, in this conventional example, the high-frequency potential of the conductor 2 is configured to be substantially the same as the potential of the radiator, The output potential is applied between the induction coil on the side connected to the first conductor of the cable and the radiator. This output potential becomes a high voltage at the start of the electrodeless discharge lamp, and therefore, it is necessary to have a high withstand voltage between the induction coil and the radiator, which increases the cost and the volume in the cavity. Leads to a decrease.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an inexpensive and small electrodeless discharge lamp lighting device that can reduce noise with a simple configuration. It is in.

  In order to solve the above-mentioned problem, the electrodeless discharge lamp lighting device of the present invention is wound around the electrodeless discharge lamp 1 and has the first and second terminal portions 2a and 2b as shown in FIG. The induction coil 2, the series circuit 13 of at least two switching elements 13a and 13b switched at high frequency, and the third and fourth terminal portions 3a and 3b connected to the connection point of the switching elements 13a and 13b. LC resonance circuit 19, first conductor 4 connected to first and third terminal portions 2a and 3a and surrounded by insulator 4a, and second and fourth terminal portions 2b and 3b And the first capacitance element 6 connected to the third and fourth terminal portions 3a and 3b in the LC resonance circuit 19 with the periphery surrounded by the insulator 5a. And having no In the polar discharge lamp lighting device, a second capacitance element 7 is inserted between the first conductor 4 and the third terminal portion 3a, and the second conductor 5 and the fourth conductor 4 are inserted. A third capacitance element 8 is inserted between the terminal portion 3b, and the capacitance values of the second and third capacitance elements 7 and 8 are substantially equal. The first conductor 4 and the second conductor The thicknesses of the insulators 4a and 5a around 5 are substantially equal, and the distance between the first conductor 4 and the second conductor 5 is substantially constant as shown in FIGS. It has the holding means 9 to keep.

According to the first aspect of the present invention, a second capacitance element is inserted between the first conductor and the third terminal portion, and the second conductor and the fourth terminal portion are By inserting a third capacitance element between them and making the capacitance values of the second and third capacitance elements substantially equal, the potential fluctuation with respect to the stable potential of the first terminal portion and the second terminal portion is The fluctuations are almost equal in magnitude and opposite in polarity. For this reason, each potential fluctuation can be canceled each other, and there is an effect that noise can be reduced without the need to provide the second winding body in the cavity as in the conventional example.
Further, by making the thicknesses of the insulators around the first conductor and the second conductor substantially equal, not only the fluctuation of the potential with respect to the stable potential but also the floating with respect to the stable potential can be observed at the portion of the conductor. Capacitance components can be made substantially equal, so that the current applied to each conductor is reversed and the current flowing to the stable potential through the stray capacitance is canceled by the electric potential of almost equal magnitude, and the noise generated by this part is reduced. There is an effect that can be reduced.
Further, by having a holding means for keeping the distance between the first conductor and the second conductor constant, the second conductor is passed through the first conductor and the induction coil. There is an effect that noise generated by a current loop flowing through the body can be reduced.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, even when a metal body is provided in the vicinity of the first and second conductors, the first and second The first and second electric conductors can be arranged without considering the positional relationship of the electric conductors, and the degree of freedom when arranging the electrodeless discharge lamp lighting device in the fixture is increased.
According to the invention of claim 3, in addition to the effects of the inventions of claims 1 and 2, noise generated in the common mode in the first and second conductors can be reduced.
According to the invention of claim 4, even if a heat dissipator that reduces the temperature of the induction coil is provided, the potential difference between the first and second conductors and the heat dissipator is approximately half that of the conventional method. The withstand voltage can be reduced, measures such as thinning the insulating film can be taken, the conductor can be made inexpensive, and the volume in the cavity can be reduced.

According to the invention of claim 5, in addition to the effects of the inventions of claims 1 to 4, conductors for connection can be reduced, and the connection between the radiator and the stable potential is ensured, A highly reliable electrodeless discharge lamp lighting device can be obtained.
According to the invention of claim 6, in addition to the effects of claims 1 to 5, the number of switching elements can be made four, and the output of the electrodeless discharge lamp lighting device is increased by adopting a full bridge configuration. It becomes possible to do.
According to the invention of claim 7, in addition to the effects of claims 4 to 6, a high-frequency cutoff filter by a capacitance element can be configured at the output portion of the resonance circuit, and the noise reduction effect is further enhanced with a simple configuration. An electrodeless discharge lamp lighting device can be obtained.

According to invention of Claim 8, the characteristic of the electrodeless discharge lamp lighting device stable with respect to the change of the length of the said 1st and 2nd conductor can be acquired.
According to the ninth aspect of the invention, in addition to the effects of the first to eighth aspects, abnormal situations such as disconnection of the first and second conductors of the electrodeless discharge lamp lighting device and disconnection of the induction coil can be obtained. Thus, it is possible to obtain a highly safe electrodeless discharge lamp lighting device that can be detected by a simple additional circuit and can stop the voltage applied to the third and fourth terminal portions.

  FIG. 1 shows a basic configuration example of the present invention. This lighting device is a series circuit of an induction coil 2 wound around an electrodeless discharge lamp 1 and having first and second terminal portions 2a and 2b, and at least two switching elements 13a and 13b that are switched at a high frequency. 13, an LC resonance circuit 19 having third and fourth terminal portions 3 a and 3 b connected to a connection point of the switching elements 13 a and 13 b, and an insulating body connected to the first and third terminal portions A first conductor 4 surrounded by 4a; a second conductor 5 connected to the second and fourth terminal portions and surrounded by an insulator 5a; and the LC conductor in the LC resonance circuit An electrodeless discharge lamp lighting device having a first capacitance element 6 connected to third and fourth terminal portions, wherein a second is provided between the first conductor and the third terminal portion. Capacitance element 7 The third capacitance element 8 is inserted between the second conductor and the fourth terminal portion, and the capacitance values of the second and third capacitance elements are substantially equal, and the first capacitance element The thickness of the insulators around the conductor and the second conductor is substantially equal, and holding means 9 is provided to keep the distance between the first conductor and the second conductor substantially constant. It is characterized by being.

  FIG. 2 is a cross-sectional view of the first conductor 4 and the second conductor 5 in a direction perpendicular to the length direction. Here, the holding means 9 serves as means for joining the insulator 4a of the first conductor 4 and the insulator 5a of the second conductor 5 over the main part thereof. The potential fluctuations with respect to the stable potentials of the first terminal portion 2a and the second terminal portion 2b are substantially equal in magnitude and opposite in polarity. For this reason, there exists an effect | action which cancels each electric potential fluctuation | variation mutually, and it is not necessary to provide a 2nd winding body in a cavity like a prior art example, and noise can be reduced.

  Further, by making the thicknesses of the insulators 4a and 5a around the first conductor 4 and the second conductor 5 substantially equal, not only the potential fluctuation with respect to the stable potential can be observed in the conductor portion. Since the stray capacitance component with respect to the stable potential can be made substantially equal, the current flowing to the stable potential through the stray capacitance is canceled by the potential of the polarity applied to each conductor being opposite and the magnitude being almost equal. The noise generated in can also be reduced.

  Further, by having a holding means 9 for keeping the distance between the first conductor 4 and the second conductor 5 substantially constant, the first conductor 4 and the induction coil 2 are passed. The noise generated by the current loop flowing through the second conductor 5 can be reduced.

  FIG. 3 is another example of a cross-sectional view in the direction perpendicular to the length direction of the first conductor 4 and the second conductor 5. Here, the holding means 9 has a structure that covers the insulator 4a of the first conductor 4 and the insulator 5b of the second conductor 5 over its main part.

  FIG. 4 shows the configuration of the first embodiment of the present invention. The present embodiment is based on the configuration of claim 2 and is characterized in that the first conductor 4 and the second conductor 5 have a double helical positional relationship. Other configurations are the same as the basic configuration shown in FIG.

  The operation of this embodiment will be described with reference to FIG. In this figure, only the vicinity of the first and second conductors is depicted. As in the present embodiment, the first conductor and the second conductor have a double spiral positional relationship, so that the metal body 30 is disposed in the vicinity of the first and second conductors. Even in this case, the positional relationship of the first and second conductors with respect to the metal body can extend while being interchanged with each other. As a result, even when a metal body is disposed in the vicinity of the first and second conductors, the first and second conductors can be used without considering the positional relationship between the first and second conductors. Thus, the degree of freedom in arranging the electrodeless discharge lamp lighting device in the fixture is increased.

  FIG. 6 shows the configuration of the second embodiment of the present invention. The present embodiment is based on the configuration of claim 3, and includes a third conductor 10 surrounding the insulators 4 a and 5 a around the first and second conductors 4 and 5, and the third conductor 10. The conductor 10 is connected to the stable potential of the series circuit 13 via a capacitance element 11. Other configurations are the same as the basic configuration shown in FIG.

  In the present embodiment, a third conductor 10 surrounding the insulators 4a and 5a around the first and second conductors 4 and 5 is provided, and the third conductor 10 is a stable potential of the series circuit 13. Since the first and second conductors 4 and 5 are connected through the capacitance element 11, noise generated in the common mode can be reduced. As in the present embodiment, when the applied potentials with respect to the stable potentials of the first and second conductors 4 and 5 are set to potentials having opposite polarities and substantially equal magnitudes, currents flowing to the stable potentials via the stray capacitance are It is canceled out by the other conductors 5 and 4. Therefore, in the third conductor 10 in the present embodiment, the current generated by the stray capacitance hardly flows. Therefore, since the current due to the stray capacitance cannot be a loop that returns to the stable potential of the series circuit, the third conductor 10 can be made thin. For this reason, even if it provides a 3rd conductor, a small electrodeless discharge lamp lighting device can be obtained.

  FIG. 7 shows the configuration of the third embodiment of the present invention. The present embodiment is based on the configuration of claim 4 and is provided with a radiator 12 wound around the induction coil 2, and the radiator 12 is connected to a stable potential of the series circuit 13 via a capacitance element 11. It is characterized by that. Other configurations are the same as the basic configuration shown in FIG.

  In the present embodiment, a heat radiator 12 wound around the induction coil 2 is provided, and the heat radiator 12 is connected to the stable potential of the series circuit 13 via the capacitance element 11. Since the potential applied to the conductors 4 and 5 has a polarity opposite to that of the stable potential and is substantially equal in magnitude, the potential difference from the stable potential can be approximately half that of the conventional method. That is, even if a heat radiator that reduces the temperature of the induction coil 5 is provided, the potential difference between the first and second conductors 4 and 5 and the heat radiator 12 is substantially half that of the conventional method. Measures such as reducing the thickness of the insulating film can be taken, the conductor can be made inexpensive, and the volume in the cavity can be reduced. In addition, even if the stray capacitance between the radiator 12 and the heat sink 12 increases due to the thin insulating film, the potential applied to the first and second conductors is large in reverse polarity with respect to the stable potential. Since the potentials are substantially equal, the noise remains lowered, and an electrodeless discharge lamp lighting device having an excellent noise reduction effect can be obtained.

  FIG. 8 shows the configuration of Embodiment 4 of the present invention. This embodiment is based on the configuration of claim 5, and is provided with a radiator 12 wound around the induction coil 2, and the radiator 12 is connected to a stable potential of the series circuit 13 via a capacitance element 11. The radiator 12 is connected to the third conductor 10. The other configuration is the same as that of the second embodiment shown in FIG.

  Thereby, in addition to the effects of claims 1 to 3, the number of conductors for connection can be reduced, and the connection between the heat radiating body and the stable potential is ensured, and a highly reliable electrodeless discharge lamp. A lighting device can be obtained.

  FIG. 9 shows the configuration of the fifth embodiment of the present invention. This embodiment is based on the configuration of claim 6 and is characterized in that the fourth terminal portion 3b is connected to a second series circuit 14 including two switching elements 14a and 14b via an inductance Lb. To do. A connection point between the switching elements 13a and 13b is connected to the third terminal portion 3a via an inductance La. A DC voltage is applied to each of the series circuits 13 and 14, the switching elements 13a and 14b are ON, the switching elements 13b and 14a are OFF, the switching elements 13a and 14b are OFF, and the switching elements 13b and 14a are ON. Alternately alternating at high frequency, a high frequency voltage is generated in the capacitance element 6.

  According to the present embodiment, in addition to the effects of the first to fourth embodiments, it is possible to obtain a full bridge configuration by increasing the output of the electrodeless discharge lamp lighting device by using four switching elements. Is possible. In the full-bridge configuration, in the conventional method, the potential of the second conductor fluctuates at a high frequency and cannot be connected to a stable potential. Alternatively, the potential of the second conductor can be made stable by converting the potential of the first and second conductors using a transformer. In this case, an electrodeless discharge lamp is used by the transformer. Larger lighting devices and increased heat generation occur. By adopting the configuration of the present invention, noise can be reduced without taking the potential of the second conductor to be a stable potential. Therefore, an element such as a transformer is not required in the full bridge configuration, and the configuration is simple. An electrodeless discharge lamp lighting device having a small size and a high noise reduction effect can be obtained.

  FIG. 10 shows the configuration of the sixth embodiment of the present invention. The present embodiment is based on the configuration of claim 7, and includes a connection point between the first conductor 4 and the second capacitance element 7, the second conductor 5 and the third capacitance element 8, and the like. A fourth capacitance element 15 is provided between the connection point and the connection point. Other configurations are the same as the basic configuration shown in FIG.

  In the present embodiment, by providing the fourth capacitance element 15, in addition to the effects of claims 4 to 6, a high-frequency cutoff filter by the capacitance element 15 can be configured at the output portion of the resonance circuit 19. This is combined with the inductance component of the first and second conductors 4 and 5 arranged in the subsequent stage of the resonance circuit 19 depending on the length thereof, thereby further improving the high-frequency cutoff characteristics. Accordingly, it is possible to obtain an electrodeless discharge lamp lighting device having a simple configuration and a higher noise reduction effect.

  Furthermore, the capacitance value of the first or fourth capacitance element 6, 15 is a value that is 20 times or more the capacitance value per meter between the first conductor 4 and the second conductor 5. . This is based on the configuration of claim 8.

  It is desirable that the lengths of the first and second conductors 4 and 5 of the electrodeless discharge lamp lighting device can be changed according to the required form of the appliance. However, as described above, the Q value of this system is high, and the characteristics of the electrodeless discharge lamp lighting device are greatly fluctuated due to variations in inductance value and capacitance value. For this reason, when the lengths of the first and second conductors 4 and 5 are changed, the capacitance value between the conductors 4 and 5 changes, and the characteristics of the electrodeless discharge lamp lighting device change. .

  Here, as in the present invention, the capacitance value of the first or fourth capacitance element 6, 15 is set to the capacitance value per meter between the first conductor 4 and the second conductor 5. When the induction coil 2 and the resonance circuit 19 are disposed in one instrument by being 20 times or more, it is stable against changes in the length of the first and second conductors 4 and 5. The characteristics of the electrodeless discharge lamp lighting device can be obtained. Of course, in the electrodeless discharge lamp lighting device having means for varying the lighting frequency, the lighting frequency is set against the change in inter-conductor capacitance due to the change in the length of the first and second conductors 4 and 5. Although the influence can be absorbed by changing, the frequency fluctuation range can be reduced and the frequency range of the generated noise can be regulated according to the configuration of claim 8. The means for reduction can be simplified.

  FIG. 11 shows the configuration of the seventh embodiment of the present invention. This embodiment is based on the configuration of claim 9, and a DC voltage applying means 16 is provided at a connection point between the first conductor 4 and the second capacitance element 7, and the second conductor DC voltage detecting means 17 is provided at the connection point between the first and second capacitance elements 8, and a high frequency applied to the third and fourth terminal portions 3 a and 3 b according to the output of the DC voltage detecting means 17. An output stopping means 18 for stopping the voltage is provided. Here, the output stopping means 18 is means for stopping the operations of the first and second switching elements 13a and 13b. In the figure, reference numeral 20 denotes a drive circuit that alternately turns on and off the switching elements 13a and 13b. The switching element 13a is ON, the switching element 13b is OFF, the switching element 13a is OFF, and the switching element 13b is ON. Are alternately generated at a high frequency to generate a high frequency voltage at both ends of the capacitance element 6. When the first conductor 4, the induction coil 2, and the second conductor 5 are not disconnected or disconnected, the DC voltage applied by the DC voltage application means 16 is detected by the DC voltage detection means 17. The output stopping means 18 determines that the load circuit is normal, and does not stop the high-frequency voltage applied to the third and fourth terminal portions 3a and 3b. On the other hand, when the first conductor 4, the induction coil 2, and the second conductor 5 are disconnected or disconnected, the DC voltage applied by the DC voltage applying means 16 is detected by the DC voltage detecting means 17. Therefore, the output stopping means 18 determines that the load circuit is abnormal, and stops the high-frequency voltage applied to the third and fourth terminal portions 3a and 3b. Specifically, a stop signal is sent from the output stop means 18 to the drive circuit 20, and both the switching elements 13a and 13b are turned off. Further, a stop signal is also sent to the control circuit 21 of the chopper circuit 22 to prevent the DC voltage of the capacitor C1 from being abnormally boosted. The chopper circuit 22 is a switching circuit that converts the pulsating voltage input from the commercial AC power supply Vs via the rectifier bridge DB into a smooth DC voltage.

  According to the present embodiment, abnormal conditions such as disconnection of the first and second conductors 4 and 5 of the electrodeless discharge lamp lighting device and disconnection of the induction coil 2 are detected by a simple additional circuit, A highly safe electrodeless discharge lamp lighting device capable of stopping the high-frequency voltage applied to the third and fourth terminal portions 3a and 3b can be obtained.

  The electrodeless discharge lamp lighting device described in the above basic configuration or each example can be used as a lighting device as shown in FIG. 14, for example. Since the electrodeless discharge lamp 1 is generally driven at a high frequency of several tens of MHz, it is covered with a shield cover 25 such as a metal mesh in order to absorb radiation noise from the lamp. Reference numeral 23 denotes a base that supports the induction coil 2, and 24 denotes a lighting circuit.

  INDUSTRIAL APPLICABILITY The present invention can be used as, for example, an outdoor or high-level lighting device as a long-life lighting device with high efficiency and low lamp replacement frequency.

It is a circuit diagram which shows the basic composition of this invention. It is sectional drawing which shows an example of the holding means used for this invention. It is sectional drawing which shows another example of the holding means used for this invention. It is a circuit diagram which shows the structure of Example 1 of this invention. It is operation | movement explanatory drawing of Example 1 of this invention. It is a circuit diagram which shows the structure of Example 2 of this invention. It is a circuit diagram which shows the structure of Example 3 of this invention. It is a circuit diagram which shows the structure of Example 4 of this invention. It is a circuit diagram which shows the structure of Example 5 of this invention. It is a circuit diagram which shows the structure of Example 6 of this invention. It is a circuit diagram which shows the structure of Example 7 of this invention. It is sectional drawing which shows the conventional electrodeless discharge lamp lighting device. It is an equivalent circuit diagram of a conventional electrodeless discharge lamp lighting device. It is sectional drawing which shows an example of the structure of the illuminating device using the electrodeless discharge lamp lighting device of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrodeless discharge lamp 2 Inductive coil 2a 1st terminal part 2b 2nd terminal part 3a 3rd terminal part 3b 4th terminal part 4 1st conductor 4a insulator 5 2nd conductor 5a insulator 6 1st capacitance element 7 2nd capacitance element 8 3rd capacitance element 9 Holding means 13a 1st switching element 13b 2nd switching element 19 LC resonance circuit

Claims (10)

An induction coil wound around the electrodeless discharge lamp and having first and second terminal portions, a series circuit of at least two switching elements that are switched at high frequency, and a third and An LC resonance circuit having a fourth terminal portion, a first conductor connected to the first and third terminal portions and surrounded by an insulator, and connected to the second and fourth terminal portions An electrodeless discharge lamp lighting device comprising a second conductor surrounded by an insulator and a first capacitance element connected to the third and fourth terminal portions in the LC resonance circuit A second capacitance element is inserted between the first conductor and the third terminal portion, and a third capacitance is inserted between the second conductor and the fourth terminal portion. A capacitance element is inserted, and the second And the capacitance values of the third capacitance elements are approximately equal, and the thicknesses of the insulators around the first conductor and the second conductor are approximately equal, and the first conductor and the second conductor An electrodeless discharge lamp lighting device comprising holding means for keeping a distance between bodies substantially constant. The electrodeless discharge lamp lighting device according to claim 1, wherein the first conductor and the second conductor have a double spiral positional relationship. A third conductor surrounding an insulator around the first and second conductors is provided, and the third conductor is connected to a stable potential of the series circuit via a capacitance element. The electrodeless discharge lamp lighting device according to claim 1 or 2. The electrodeless electrode according to any one of claims 1 to 3, wherein a heat radiator wound around the induction coil is provided, and the heat radiator is connected to a stable potential of the series circuit via a capacitance element. Discharge lamp lighting device. The electrodeless discharge lamp lighting device according to claim 4, wherein the radiator is connected to the third conductor. 6. The circuit according to claim 1, further comprising a series circuit of two other switching elements that are switched at a high frequency, wherein the fourth terminal portion is connected to a connection point of the switching elements via an inductance element. An electrodeless discharge lamp lighting device according to claim 1. A fourth capacitance element is provided between a connection point between the first conductor and the second capacitance element and a connection point between the second conductor and the third capacitance element. The electrodeless discharge lamp lighting device according to any one of claims 1 to 6. 8. A capacitance value of the first or fourth capacitance element is 20 times or more of a capacitance value per meter between the first conductor and the second conductor. The electrodeless discharge lamp lighting device according to any one of the above. DC voltage application means is provided at a connection point between the first conductor and the second capacitance element, and DC voltage detection means is provided at a connection point between the second conductor and the third capacitance element, 9. An electrodeless device according to claim 1, further comprising output stop means for stopping a voltage applied to the third and fourth terminal portions in accordance with an output of the DC voltage detection means. Discharge lamp lighting device. An illuminating device comprising the electrodeless discharge lamp lighting device according to claim 1.

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