JP2000164380A - Electrodeless discharge lamp lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the discharge in an electrodeless discharge lamp, miniaturize the electrodeless discharge lamp, and improve the efficiency thereof by providing a high frequency electric field discharge adjusting means for generating high frequency electric field discharge and a high frequency electromagnetic field discharge adjusting means for adjusting the high frequency electromagnetic field discharge voltage, and adjusting the high frequency electric field discharge voltage and the high frequency electromagnetic discharge voltage nearly equal to each other. SOLUTION: High frequency electric field discharge and high frequency electromagnetic field discharge are generated for lighting in an electrodeless discharge lamp La. High frequency electric field discharge voltage VE to be applied to an induction coil 1 so as to generate discharge and high frequency electromagnetic field discharge voltage VH are adjusted nearly equal to each other. This adjustment is performed by lowering the voltage VH reducing the number of winding of the induction coil. The voltage VH also can be lowered by switching the operation frequency of a high frequency generating circuit 2 or Q of a matching circuit 3. Capacity of the circuit can be reduced to the minimum and the lighting device can be miniaturized and the efficiency of the device can be improved by adjusting the voltage VH with the high frequency electromagnetic field discharge adjusting means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electrodeless discharge lamp lighting device, and more particularly, to an electrodeless low-pressure fluorescent lamp lighting device.

[0002]

2. Description of the Related Art A conventional electrodeless discharge lamp lighting device is shown in FIG.
As shown in FIG. 7, the electrodeless discharge lamp La in which the discharge gas is sealed in the glass bulb 4 and the inner bulb 4a of the glass bulb 4 arranged close to the glass bulb 4 or in a double tube configuration. A high-frequency power supply coil (hereinafter, referred to as an induction coil) 1, a high-frequency power generation circuit 2 that is a high-frequency power supply that converts a DC power supply E into an AC high-frequency power and supplies the high-frequency power to the induction coil 1. And high frequency generation circuit 2
A high-frequency magnetic field is generated by supplying a high-frequency current to the induction coil 1 through the matching circuit 3 for matching the impedances of the two, and a high-frequency power is supplied to the electrodeless discharge lamp La. A plasma current is generated to generate ultraviolet light or visible light. Note that the matching circuit 3 can be omitted if the induction coil 1 is matched by the high frequency generation circuit 2.

In general, this induction coil 1 is composed of several turns of winding and has an inductance of 1 to 3 μH. A high-frequency voltage of a constant frequency (generally several MHz to 13.56 MHz) generated by the high-frequency generation circuit 2 is supplied to the induction coil 1, and the high-frequency voltage generates a discharge in the spherical glass bulb 4.

Next, starting of the electrodeless discharge lamp La will be described. In starting the electrodeless discharge lamp La, unlike a general electroded discharge lamp, the glass bulb 4 and the induction coil 1 disposed close to and along the glass bulb 4 need to be considered integrally. There is discharge.

As a sequence of the discharge, when a voltage is applied to the induction coil 1, first, the gas in the glass bulb 4 is excited through the induction coil 1 and the lamp wall of the electrodeless discharge lamp La, A high-frequency electric field discharge is generated, and a pilot light is generated, resulting in a glow discharge state. Thereafter, when a voltage is further supplied to the induction coil 1, a high-frequency electromagnetic field discharge occurs, the electrodeless discharge lamp La is turned on, and a stable arc discharge is achieved.

First, the high-frequency electric field discharge (also referred to as E discharge) will be described. In the high-frequency electric field discharge, a discharge current flows through the capacitance of the lamp tube of the electrodeless discharge lamp La. When a high-frequency voltage is applied to the induction coil 1 in FIG. As shown in FIG. 8B, the gas in the electrodeless discharge lamp La is excited and emits light via the induction coil 1 and the capacitance C0 of the lamp tube wall of the electrodeless discharge lamp La. This discharge becomes a slight discharge (glow discharge state),
When the voltage of the induction coil 1 is increased, the operation shifts to the main discharge. This discharge acts like a pilot flame for shifting to the main discharge.

Next, high-frequency electromagnetic field discharge (also referred to as H discharge) will be described. In the high-frequency electromagnetic field discharge, an induction current is caused to flow by electromagnetic induction of the induction coil 1 close to the electrodeless discharge lamp La, and as shown in FIG. And the electrodeless discharge lamp La
It can be understood as a transformer having the plasma ring 12 generated therein as a one-turn secondary winding. At this time, FIG.
(B) shows the equivalent circuit. Here, the high-frequency electromagnetic field discharge is a main discharge (arc discharge state) that contributes to the emission of the electrodeless discharge lamp La. 8 and 9, the same components as those in FIGS. 6 and 7 are denoted by the same reference numerals.

Here, referring to FIG. 10, an electrodeless discharge lamp La will be described.
The state from start-up to lighting will be described. In FIG. 10, a voltage starts to be applied to the induction coil 1 at a time t0, and when a voltage VE is applied at a time t1, a high-frequency electric field discharge occurs in the electrodeless discharge lamp La. Then, at time t2, the voltage V
By applying a voltage VH higher than E, a high-frequency electromagnetic field discharge occurs in the electrodeless discharge lamp La, and at time t3, the electrodeless lamp La shifts to arc discharge.

[0009]

At this time, the voltage VE <
In the case of the voltage VH, the voltage VE for generating the high-frequency electric field discharge may be small, but the voltage VH for generating the high-frequency electromagnetic field discharge becomes large, and the lighting circuit satisfies the large voltage VH. Therefore, a large circuit capacity is required, which leads to an increase in the size of the lighting device.

When the voltage VE> the voltage VH, even if the voltage VH is applied to the induction coil 1, a high-frequency electric field discharge, which is the seed of the discharge, does not occur. A large voltage must be supplied. Therefore, even in this case, the size of the lighting device is increased. The same can be said for the power WE supplied to the induction coil 1 for generating high-frequency electric field discharge and the power WH supplied to the induction coil 1 for generating high-frequency electromagnetic field discharge.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to enable stable discharge of an electrodeless discharge lamp and to reduce the size and efficiency of an electrodeless discharge lamp. To supply a light lighting device.

[0012]

According to the present invention, there is provided an electrodeless discharge lamp in which a discharge gas is sealed in a glass bulb, wherein the electrodeless discharge lamp is disposed close to or along the glass bulb. An electrodeless discharge lamp lighting device provided with an induction coil disposed in an inner tube of the same, and a high-frequency power supply that receives a supply from a DC power supply and supplies high-frequency power to the induction coil, wherein the high-frequency electric field is applied to the induction coil. High-frequency electric-field discharge adjusting means for adjusting a high-frequency electric-field discharge voltage for generating a discharge, and high-frequency electromagnetic-field discharge adjusting means for adjusting a high-frequency electromagnetic-field discharge voltage applied to the induction coil for generating a high-frequency electromagnetic field discharge The high-frequency electric field discharge adjusting means and the high-frequency electromagnetic field discharge adjusting means, the high-frequency electric field discharge voltage and the high-frequency electromagnetic field discharge voltage And adjusting so that the same voltage.

The structure of the induction coil is adjusted by the high frequency electric field discharge adjusting means and the high frequency electromagnetic field discharge adjusting means so that the high frequency electric field discharge voltage and the high frequency electromagnetic field discharge voltage are substantially equal. It is characterized by.

Further, in the process from the start to the lighting of the electrodeless discharge lamp, the high-frequency electric field discharge voltage or the high-frequency electromagnetic field discharge voltage is switched.

Further, the power supplied to the induction coil for generating high-frequency electric field discharge and the power supplied to the induction coil for generating high-frequency electromagnetic field discharge are set to be substantially the same. It is characterized by.

Further, the high frequency electric field discharge voltage or the electric power supplied to the induction coil for generating the high frequency electric field discharge is provided by interposing a dielectric between the induction coil and the glass bulb.

Further, a high voltage is applied by a high voltage pulse generating circuit between the induction coil and an electrode provided on the surface of the glass bulb or between the induction coil.

[0018]

(Embodiment 1) The present invention will be described with reference to FIG.
An electrodeless discharge lamp La in which the induction coil 1 is arranged close to the glass bulb 4 described in FIG. 7, or an electrodeless lamp provided with the electrodeless discharge lamp La in which the induction coil 1 is arranged in the inner tube 4a of the glass bulb 4. In a discharge lamp lighting device, the generation of a high-frequency electric field discharge and a high-frequency electromagnetic field discharge is optimally set, thereby improving the size of the device and preventing a decrease in efficiency.

First, the voltage VE and the power WE described in the conventional example
FIG. 2A shows the relationship between the number of turns of the induction coil 1 and the number of turns. As shown in the figure, the voltage VE is substantially constant with respect to the number of turns of the induction coil 1, and the larger the number of turns of the induction coil 1, the larger the inductance and the smaller the current.
The power WE decreases.

Next, the voltage VH and the power WH described in the conventional example
FIG. 2B shows the relationship between the number of turns of the induction coil 1 and the number of turns. As already described with reference to FIGS. 9A and 9B, the high-frequency electromagnetic field discharge can be regarded as a transformer having the plasma ring 12 as a one-turn secondary coil and the induction coil 1 as an n-turn primary coil. If the loss in the induction coil 1 can be neglected, the power consumption viewed from the induction coil 1 becomes the power consumption to the electrodeless discharge lamp La, and the power W
H is substantially constant irrespective of the number of turns of the induction coil 1. On the other hand, the voltage VH increases as the number of turns of the induction coil 1 increases.
growing.

Next, the induction coil 1 of the voltage VE and the voltage VH
FIG. 3 (a) shows the relationship between the number of turns and the change in the number of turns. That is, FIG. 3A shows the voltage V shown in FIGS. 2A and 2B.
E and the voltage VH are shown in the same figure. Here, assuming that the number of turns of the induction coil 1 at which the voltage VE and the voltage VH are substantially the same is n2, the voltage V is obtained at the number of turns n3 larger than the number of turns n2.
H> voltage VE, and when the number of turns n1 is smaller than the number of turns n2, the voltage VH <the voltage VE.

Further, an induction coil 1 for electric power WE and electric power WH
FIG. 3 (b) shows the relationship with respect to the change in the number of turns. That is, FIG. 3B shows the power W shown in FIGS. 2A and 2B.
E and power WH are shown in the same figure. Here, assuming that the number of turns of the induction coil 1 at which the power WE and the power WH are substantially the same is n12, the power WH> the power WE when the number of turns n13 is larger than the number of turns n12, and the power WH <the power WE when the number of turns n11 is smaller than the number of turns n12. Has become.

Next, the design factors of the high-frequency electric field discharge and the high-frequency electromagnetic field discharge will be described. For the high-frequency electric field discharge, as described above, the induction coil 1 and the electrodeless discharge lamp L
The electrostatic coupling of the lamp tube a greatly influences. That is, the high-frequency electric field discharge is caused by the electric field strength at the winding end of the induction coil 1, the thickness of the induction coil 1, and the distance between the induction coil 1 and the tube wall of the electrodeless discharge lamp La (T shown in FIG. 8B). ),
It is determined by a mechanical structure such as capacitance (dielectric constant) between the induction coil 1 and the electrodeless discharge lamp La. At this time, the lighting frequency of the electrodeless discharge lamp La also affects, but this is assumed to be constant.

On the other hand, the high-frequency electromagnetic field discharge can be regarded as a transformer using the induction coil 1 and the plasma ring 12 as described above, and the voltage V of the induction coil 1 becomes V∝.
φ · f · N (φ is a magnetic flux, f is a frequency, N is the number of turns), and is mainly governed by electrical factors.

Next, a specific embodiment will be described. FIG. 1 shows a lighting circuit of an electrodeless discharge lamp lighting device according to the present invention. The lighting circuit rectifies an AC power supply AC with a rectifier DB and converts a DC voltage smoothed by a smoothing capacitor C1 into a switching element connected in series. Q1 and Q2 are alternately turned on and off to convert to an AC high frequency voltage, and inductor L1 and capacitor C3
, A matching circuit 3 including capacitors C4 to C6, and an electrodeless discharge lamp La, which is an electrodeless low-pressure discharge lamp.
Switch element SW1 for switching the number of turns of induction coil 1
Thus, the energy is efficiently transmitted to the electrodeless discharge lamp La, so that the discharge gas sealed in the glass bulb 4 is given and excited by electromagnetic field energy, and the electrodeless discharge lamp La is turned on.

Further, in this circuit, a high-frequency current flowing through the induction coil 1 is detected by a detection circuit 7 via a current transformer CT, and a switching circuit 8 controls a switch element SW1, that is, the number of turns of the induction coil 1 is switched. As a result, the above-described voltages VE and VH are switched to generate the voltages VE and VH under optimum conditions.

The DC voltage smoothed by the capacitor C1 is used as a power supply for the oscillation driving circuit 5 through a series-parallel circuit composed of resistors R1 and R2 and a smoothing capacitor C2. Secondary winding n20, Secondary winding n2
The switching elements Q1 and Q2 are oscillated at a high frequency via a transformer T1 having an n1 and an n22. The matching circuit 3 includes a switching element Q1,
The impedance is matched between the high frequency generating circuit 2 which is a high frequency power supply including Q2 and the induction coil 1 to eliminate or reduce the reflection, and the high frequency power is efficiently supplied to the glass bulb 4. In FIG. 1, the same components as those in FIGS. 6 and 7 are denoted by the same reference numerals, and a rectifier DB and a capacitor C1 constitute a DC power supply E.

By the way, the electrodeless discharge lamp La of the electrodeless discharge lamp lighting device configured as described above generates and turns on the high-frequency electric field discharge and the high-frequency electromagnetic field discharge as described above.
At this time, the high-frequency electric field discharge voltage applied to the induction coil 1 to generate the high-frequency electric field discharge, that is, the voltage V
E, a high-frequency electromagnetic field discharge voltage applied to the induction coil 1 to generate a high-frequency electromagnetic field discharge, that is, a voltage V
H is adjusted to be substantially equal.

Here, if the voltage VE is smaller than the voltage VH, the voltage VH may be reduced.
As described above, the voltage VH is governed by electrical factors, and an electrical means is effective in reducing the voltage VH.

At this time, the voltage VH may be adjusted so that the voltage VE and the voltage VH are substantially the same, that is, the voltage VH is reduced by reducing the number of turns of the induction coil 1. Alternatively, the operating frequency of the high frequency generating circuit 2 or the Q of the matching circuit 3 may be switched to reduce the voltage VH and adjust the voltage VH to be substantially equal to the voltage VE. Thus, the voltage VH is adjusted by the high-frequency electromagnetic field discharge adjusting means.

As described above, by adjusting the voltage VH and the voltage VE to be substantially equal to each other, the capacity of the circuit can be minimized, and the lighting device can be reduced in size and efficiency can be improved.

Here, in FIG. 1, voltage VE <voltage V
The operation of the lighting circuit in the case of H will be described. AC power supply A
Immediately after the power of C is turned on, the switch element SW1 is turned off and the number of turns of the induction coil 1 is set to be large, so that the voltage VE is applied to the induction coil 1 and a stable high-frequency electric field discharge is generated in the glass bulb 4. After a lapse of a certain time or by the current transformer CT and the detection circuit 7, it is determined that the plasma state in the glass bulb 4 is a high-frequency electric field discharge.
After the detection, the switching circuit 8 turns on the switch element SW1. When the switch element is turned on, the number of turns of the induction coil 1 is reduced, the voltage VH is reduced, a high-frequency electromagnetic field discharge is easily generated, and the electrodeless lamp La can be easily turned on.

At this time, when the number of turns is larger than the number of turns at which the voltage VE and the voltage VH are substantially equal, the number of turns is changed in a direction of decreasing the voltage VH (decreasing the number of turns), and the voltage VH is changed.
It is effective to make the voltage VE and the voltage VE substantially equal. In this way, by switching the voltage in the process of starting and lighting the electrodeless discharge lamp La, the discharge lamp can be easily and stably lighted.

Next, the case where the voltage VE> the voltage VH will be described. In this case, the voltage VE may be reduced so that the voltage VE and the voltage VH become substantially equal. Therefore,
The size (thickness) of the induction coil 1, which is the structure of the induction coil, the distance between the electrodeless discharge lamp La and the induction coil 1, the capacitance (dielectric constant) between the induction coil 1 and the electrodeless discharge lamp La. Is adjusted to reduce the voltage VE.

For example, high-frequency electric field discharge has a large correlation with the distance from the induction coil 1 to the tube wall of the electrodeless discharge lamp La,
As the distance increases, the voltage VE and the power WE increase. Therefore, by shortening the distance from the induction coil 1 to the tube wall of the electrodeless discharge lamp La, the voltage VE may be reduced so that the voltage VE and the voltage VH may be adjusted to be substantially equal.

As shown in FIG. 4, a dielectric 6 having a high dielectric constant is interposed between the induction coil 1 and the glass bulb 4. The dielectric 6 lowers the dielectric constant between the induction coil 1 and the glass bulb 4 and lowers the voltage VE. Further, a proximity conductor may be provided near the glass bulb 4 to lower the voltage VE. Thus, the voltage VE is adjusted by the high-frequency electric field discharge adjusting means. In FIG. 4, the same components as those in FIGS. 6 and 7 are denoted by the same reference numerals.

When the voltage VE is higher than the voltage VH, the switch SW1 is turned off immediately after the power is turned on in the lighting circuit of FIG. 1 so that the number of turns of the induction coil 1 is increased. It is preferable that the high-frequency electric field discharge and the high-frequency electromagnetic field discharge are appropriately performed by setting the voltage VH to be substantially the same.

The above description has focused on the voltage VE and the voltage VH, but the induction coil 1 for generating high-frequency electric field discharge has been described.
The same can be said for the power WE supplied to the induction coil 1 and the power WH supplied to the induction coil 1 for generating the high-frequency electromagnetic field discharge.
And the power WH are set to be substantially the same, the circuit capacity of the lighting circuit can be reduced, and the size and efficiency of the lighting device can be reduced.

Here, the case where the electric power WE> the electric power WH is considered. In the circuit of FIG. 1, immediately after the AC power supply is turned on, the switch element SW1 is turned off to increase the number of turns of the induction coil 1, and the power WE is supplied to the induction coil 1. Generates discharge.

After the current transformer CT and the detection circuit 7 detect that the discharge in the glass bulb 4 is a high-frequency electric field discharge, the switching circuit 8 detects the switching element S.
Turn on W1. When the switch element SW1 is turned on, the number of turns of the induction coil 1 is reduced, and the electrodeless discharge lamp La is liable to generate high-frequency electromagnetic field discharge.
a can be easily turned on.

Here, when the number of turns of the induction coil 1 is smaller than the number of turns at which the power WE and the power WH are substantially the same, the number of turns of the induction coil 1 is changed in the direction of decreasing the power WE, and the power WE is reduced. It is effective to make the powers WH equal.

When the power WE <the power WH, the switching element SW1 is turned off when the power is turned on, and the induction coil 1 is turned off.
In the state where the number of turns is large (the state in which the power WE is small), the high-frequency electric field discharge is generated, and then the number of turns in the induction coil 1 is reduced to facilitate the high-frequency electromagnetic field discharge.

When the condition that the voltage VE and the voltage VH are substantially the same and the condition that the power WE and the power WH are substantially the same are different, it is preferable to set the closest value to satisfy both.

Further, the voltage VE, the voltage VH and the power WE,
The design based on both or either of the powers WH may be determined based on the characteristics and advantages and disadvantages of the electrodeless discharge lamp La and the lighting circuit.

As described above, by switching the number of turns of the induction coil 1 by using the switch element SW1, the electrodeless discharge lamp La can be stably lit with a simple configuration, thereby preventing an increase in the size of the lighting circuit.

FIG. 5 shows a high-voltage pulse generating circuit 10 connected via a start switch 11 between one end of the induction coil 1 and an electrode 9 provided on the wall surface of the glass bulb 4. When the start switch 11 is turned on, a voltage required for high-frequency electric field discharge is supplied between one end of the induction coil 1 and the electrode 9, the gas in the glass bulb 4 is ionized, and then the voltage VH is supplied to the induction coil 1. The electrodeless discharge lamp La generates arc discharge. At this time, the voltage VE can be reduced by applying a high-voltage pulse voltage.
Also in this case, if the voltage VE and the voltage VH are set to be substantially the same, the circuit capacity is reduced. In FIG. 5, the same components as those in FIGS. 6 and 7 are denoted by the same reference numerals.

Further, in FIG.
A configuration in which a voltage of 0 is applied to both ends of the induction coil 1 may be adopted. In this case, the voltage VH is also effectively reduced.

The above-described voltages VE and VH and the powers WE and WH can be measured, and depending on the magnitude of the voltages VE and VH (or the powers WE and WH), the voltage VE ≒ V VH (or power WE ≒ power WH)
It is possible to adjust to.

[0049]

According to the electrodeless discharge lamp lighting device according to the first aspect of the present invention, the electrodeless discharge lamp in which a discharge gas is sealed in a glass bulb is disposed close to or along the glass bulb. In the electrodeless discharge lamp lighting device including an induction coil disposed in the inner bulb of the glass bulb and a high-frequency power supply that receives supply from a DC power supply and supplies high-frequency power to the induction coil, the induction coil is applied to the induction coil, A high-frequency electric-field discharge adjusting means for adjusting a high-frequency electric-field discharge voltage for generating a high-frequency electric-field discharge; and a high-frequency electromagnetic-field discharge applied to the induction coil for adjusting the high-frequency electric-field discharge voltage for generating the high-frequency electric-field discharge. Adjustment means, and the high-frequency electric field discharge voltage and the high-frequency electromagnetic field discharge voltage are substantially reduced by the high-frequency electric field discharge adjustment means and the high-frequency electromagnetic field discharge adjustment means. Since adjusted to be Shii voltage, it can be made compact and high efficiency of the lighting device.

In the electrodeless discharge lamp lighting device according to a second aspect of the present invention, the high frequency electric field discharge voltage and the high frequency electromagnetic field discharge voltage are controlled by the high frequency electric field discharge adjusting means and the high frequency electromagnetic field discharge adjusting means. Since the structure of the induction coil is adjusted to have substantially the same voltage, the size and efficiency of the lighting device can be reduced.

In the electrodeless discharge lamp lighting device according to a third aspect of the present invention, the high-frequency electric field discharge voltage or the high-frequency electromagnetic field discharge voltage is switched during the process from starting to lighting of the electrodeless discharge lamp. As a result, the size and efficiency of the lighting device can be reduced.

In the electrodeless discharge lamp lighting device according to a fourth aspect of the present invention, the power supplied to the induction coil for generating a high-frequency electric field discharge and the electric power supplied to the induction coil for generating a high-frequency electromagnetic field discharge. Since the power supplied to the induction coil is set to be substantially the same, the size and efficiency of the lighting device can be reduced.

In the electrodeless discharge lamp lighting device according to a fifth aspect of the present invention, the high-frequency electric field voltage or the power supplied to the induction coil for generating the high-frequency electric field discharge is supplied to the induction coil. Since the reduction is achieved by interposing a dielectric between the glass bulbs, the size and efficiency of the lighting device can be reduced.

In the invention according to claim 6 of the present invention, a high voltage is applied by a high-voltage pulse generating circuit between the induction coil and an electrode provided on the surface of the glass bulb or between the induction coil. Since the high-frequency electric field discharge voltage is reduced, the size and efficiency of the lighting device can be reduced.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a configuration of an electrodeless discharge lamp lighting device of the present invention.

FIGS. 2A and 2B are diagrams showing a relationship between a voltage VE and an electric power WE with respect to a change in the number of turns of an induction coil, and FIG.
FIG. 4 is a relationship diagram showing a relationship between the power and the power WH.

3A is a relation diagram showing a relationship between a voltage VE and a voltage VH with respect to a change in the number of turns of an induction coil, and FIG.
FIG. 4 is a relationship diagram showing a relationship between E and power WH.

FIG. 4 is a structural view showing a structure of an electrodeless discharge lamp lighting device provided with a dielectric of the present invention.

FIG. 5 is a structural diagram showing the structure of an electrodeless discharge lamp lighting device provided with the high-voltage pulse generating circuit of the present invention.

FIG. 6 is a configuration diagram showing a configuration of a conventional electrodeless discharge lamp lighting device.

FIG. 7 is a configuration diagram showing a configuration of another conventional electrodeless discharge lamp lighting device.

FIGS. 8A and 8B show a structure of an electrodeless discharge lamp, wherein FIG.

FIGS. 9A and 9B are views showing a structure in which plasma is generated in an electrodeless discharge lamp, and FIG. 9B is an equivalent circuit diagram thereof.

FIG. 10 is a relationship diagram showing a temporal change of a voltage applied to both ends of the induction coil from the start to the lighting of the electrodeless discharge lamp La when the voltage VH> the voltage VE.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Induction coil 2 High frequency generation circuit 3 Matching circuit 4 Glass valve 5 Oscillation drive circuit 7 Detection circuit 8 Switching circuit

Claims (6)

[Claims] 1. An electrodeless discharge lamp in which a discharge gas is sealed in a glass bulb, an induction coil disposed close to the glass bulb or disposed in an inner tube of the glass bulb, and a DC power supply. An electrodeless discharge lamp lighting device provided with a high-frequency power supply for receiving supply and supplying high-frequency power to the induction coil, wherein a high-frequency electric field applied to the induction coil and adjusting a high-frequency electric field discharge voltage for generating a high-frequency electric field discharge A high-frequency electromagnetic field discharge adjusting means for adjusting a high-frequency electromagnetic field discharge voltage applied to the induction coil to generate a high-frequency electromagnetic field discharge; Adjusting means for adjusting the high-frequency electric field discharge voltage and the high-frequency electromagnetic field discharge voltage to be substantially equal to each other by adjusting means. Discharge lamp lighting device. 2. The structure of the induction coil is adjusted by the high frequency electric field discharge adjusting means and the high frequency electromagnetic field discharge adjusting means so that the high frequency electric field discharge voltage and the high frequency electromagnetic field discharge voltage are substantially equal. The electrodeless discharge lamp lighting device according to claim 1, wherein: 3. The high-frequency electric field discharge voltage or the high-frequency electromagnetic field discharge voltage is switched in a process from starting to lighting of the electrodeless discharge lamp. The electrodeless discharge lamp lighting device as described in the above. 4. The power supplied to the induction coil for generating a high-frequency electric field discharge and the power supplied to the induction coil for generating a high-frequency electric field discharge are set to be substantially the same. The electrodeless discharge lamp lighting device according to any one of claims 1 to 3, characterized in that: 5. A high-frequency electric field discharge voltage or power supplied to an induction coil for generating a high-frequency electric field discharge, wherein a dielectric is interposed between the induction coil and a glass bulb. The electrodeless discharge lamp lighting device according to any one of 1 to 4. 6. The high voltage pulse generating circuit according to claim 1, wherein a high voltage is applied between an electrode provided on the surface of the induction coil and the glass bulb or between the induction coil. Electrodeless discharge lamp lighting device.