JPH0935883A - Electrodeless discharge lamp lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a cost, in a device wherein a matching circuit can be accurately and easily adjusted to be optimized respectively in stabilized lighting and starting of an electrodeless discharge lamp, and a tolerance of dispersion of an induction coil and of dispersion of a constitutional element of the matching circuit can be set with large value. SOLUTION: In a matching circuit 3, as a means for adjusting it in starting of an electrodeless discharge lamp 1, transmitting lines 6a, consisting of a coaxial cable of 100cm having 50Ωcharacteristic impedance using polyethylene as an insulator, are provided in an input side. The matching circuit 3 is designed in a manner wherein input impedance Z3 , as viewed from a high frequency oscillating circuit 4 in stabilized lighting of the electrodeless discharge lamp 1, obtains a prescribed value composed of only a real number component, and generate output power of the high frequency oscillating circuit 4 is generated in, starting of the electrodeless discharge lamp 1, so as to give a value such as sufficient for starting the lamp.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrodeless discharge lamp lighting device which emits light by applying a high frequency electromagnetic field to an electrodeless discharge lamp.

[0002]

2. Description of the Related Art FIG. 15 shows an example of an electrodeless discharge lamp lighting device. An electrodeless discharge lamp 1 to be used is a bulb which is hermetically formed of a transparent material such as quartz or ceramics. A rare gas or a substance that excites and emits light by discharge of a rare gas, a metal vapor, or the like is enclosed, and a phosphor is applied to the inner tube surface as necessary. An induction coil 2 made of a highly conductive metal or the like is arranged close to the outer circumference of the electrodeless discharge lamp 1. A high frequency oscillation circuit 4 for supplying high frequency power to the induction coil 2, a DC power source 5 for converting the AC voltage of the AC power source AC into a DC voltage and supplying the DC voltage to the high frequency oscillation circuit 4, the electrodeless discharge lamp 1 and the induction coil 2.
And the matching circuit 3 for matching the high frequency oscillation circuit 4 with each other are connected to form an electrodeless discharge lamp lighting device. Then, a high-frequency current of several MHz to several 100 MHz is passed from the high-frequency oscillation circuit 4 to the induction coil 2 to generate a high-frequency electromagnetic field in the induction coil 2 and the electrodeless discharge lamp 1
Is supplied with high frequency power to generate high frequency plasma current in the electrodeless discharge lamp 1 to generate ultraviolet rays or visible light.

Further, the matching circuit 3 has a proper value for the input impedance viewed from the high frequency oscillation circuit 4 when the electrodeless discharge lamp 1 is stably lit so that high frequency power can be efficiently sent when the electrodeless discharge lamp 1 is stably lit. And is designed so that electrodeless discharge lamp starting is also possible.

[0004]

By the way, in order to increase the luminous efficiency of the electrodeless discharge lamp 1 at the time of lighting, the induction coil 2 and the matching circuit 3 have a very small resistance component, and the induction coil 2 and the matching circuit 3 have a very small resistance component. It is necessary to reduce the electric power consumed by 3 and therefore the induction coil 2 and the matching circuit 3 which are loads of the high frequency oscillation circuit 4 at the time of starting the electrodeless discharge lamp 1 are in a state where the Q is very high. In such a high Q state, the induction coil 2
The influence of the variation of the inductance value and the variation of the constituent elements of the matching circuit 3 becomes very large. Especially, the variation of the input impedance seen from the high frequency oscillation circuit 4 at the time of starting the electrodeless discharge lamp 1 is very large. There was a problem of becoming.

Further, when the matching circuit 3 is adjusted, it is not possible to simultaneously check the input impedance of the matching circuit 3 in two different states when the lighting of the electrodeless discharge lamp 1 is stable and when it is started. Therefore, for example, after the adjustment of the matching circuit 3 when the lighting of the electrodeless discharge lamp 1 is stable, the matching circuit 3 when starting the electrodeless discharge lamp 1 is finished.
If the input impedance of the electrodeless discharge lamp 1 is largely deviated from the predetermined value, it is necessary to perform the adjustment again when the electrodeless discharge lamp 1 is lit stably, and the matching circuit 3 is extremely adjusted. There was a problem that became complicated.
Further, in order to avoid such readjustment, it is necessary to extremely reduce the variation of the inductance value of the induction coil 2 and the variation of the constituent elements of the matching circuit 3, which causes a problem of increasing cost.

By the way, the following knowledge has been obtained regarding the variation in the input impedance of the matching circuit 3 viewed from the high frequency oscillation circuit 4 when the electrodeless discharge lamp 1 is started. This finding shows that when the matching circuit 3 does not substantially change between when the electrodeless discharge lamp 1 is turned on and when it is started, and the resistance component of the constituent elements of the matching circuit 3 can be substantially ignored. When the reactance value and some constants of the constituent elements of the matching circuit 3 vary, the input impedance of the matching circuit 3 is substantially constituted by only the resistance component when the matching circuit 3 is stable in lighting. If the input impedance at the start of the electrodeless discharge lamp 1 is adjusted so that the absolute value of the reflection coefficient with respect to the predetermined impedance value is substantially constant, and only the phase angle of the reflection coefficient varies. is there.

This will be specifically described with reference to the circuit of FIG.
I do. FIG. 16 shows an electrodeless discharge lamp 1, an induction coil 2 and a magnet.
1 shows only the hatching circuit 3 and other configurations are shown in FIG.
Since it is the same as the example in FIG. Matching circuit 1
Capacitor C that is a component _TenTo C₁₂Table 1
In addition, each part at the time of stable lighting of the electrodeless discharge lamp 1 and at the time of starting
Input impedance Z₉, Z_TenThe values of are shown in Table 2. Ma
Also, the input impedance Z of the matching circuit 3 in Table 2_Ten
On the Smith chart with a characteristic impedance of 50Ω
FIG. 17 shows the assembled product. In addition, in FIG. 17, a is low
B indicates the fixed time and B indicates the start time.

[0008]

[Table 1]

[0009]

[Table 2]

As described above, the input impedance Z ₁₀ of the matching circuit 3 is a predetermined value of 50Ω when the lamp lighting is stable,
The phase angle P ₁₀ of the reflection coefficient with respect to 50Ω is adjusted to about 49 ° at the time of starting the lamp, so that the electrodeless discharge lamp 1 can be started and power can be efficiently supplied to the lamp when the lighting is stable. The optimum value of the input impedance Z ₁₀ of the matching circuit 3 at the time of starting the lamp is determined by the characteristics of the high frequency oscillation circuit 4.

Further, the matching circuit 3 is adjusted by a capacitor.
C₁₁, C₁₂Performed by adjusting the capacity value of the electrodeless discharge lamp 1
Input impedance of the matching circuit 3 when the lighting is stable
Z_TenIs adjusted to be 50Ω. By the way
The reactance value of the conducting coil 2 is ± 3% due to manufacturing problems.
Condensation, which is a component of the variation and matching circuit 3
Sa C_TenMatches when the capacitance value of ± 5% varies
Capacitor C of circuit 3 ₁₁, C₁₂Illuminated with stable matchin
Input impedance Z of circuit 3_TenSo that it becomes 50Ω
If adjusted to, the input of the matching circuit 3 at the start
Impedance Z_TenFluctuates very much. This start
Input impedance Z_TenOn the Smith chart professional
18 (shown by circular arcs) is shown in FIG. This figure
As you can see, the input impedance Z_TenIs Smith
Located on a circle centered on the characteristic impedance on the chart
Which is consistent with the findings obtained.

The present invention has been made on the basis of the above problems and the above knowledge, and it is possible to adjust the matching circuit optimally precisely and easily when the electrodeless discharge lamp is lit stably and when it is started. It is also an object of the present invention to provide an electrodeless discharge lamp lighting device that enables to reduce the cost by allowing a large tolerance value of the variation of the induction coil and the variation of the constituent elements of the matching circuit.

[0013]

To achieve the above object, the invention of claim 1 is directed to an electrodeless discharge lamp, high-frequency magnetic field applying means for applying a high-frequency electromagnetic field to the electrodeless discharge lamp, and electrodeless discharge. A high frequency oscillating circuit for generating high frequency power supplied to the electrodeless discharge lamp through a high frequency magnetic field applying means for applying a high frequency electromagnetic field to the lamp, and matching for matching impedances of the high frequency electromagnetic field applying means and the high frequency oscillating circuit In the electrodeless discharge lamp lighting device including a circuit, the matching circuit has a predetermined impedance value in which the input impedance viewed from the high frequency oscillation circuit is substantially only a real component when the electrodeless discharge lamp lighting is stable. The electrodeless discharge run without changing the input impedance during stable operation of the electrodeless discharge lamp It is characterized in that it has a phase angle changing means for changing the phase angle of the reflection coefficient with respect to the above-mentioned predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit at the time of starting, and is different between when the lighting of the electrodeless discharge lamp is stable and when it is started. The matching circuits can be adjusted independently for each state, and the matching circuits can be adjusted precisely and easily. Further, since the input impedance of the matching circuit can be standardized regardless of the variation of the induction coil and the variation of the matching circuit constituent elements, it is possible to set a large allowable value of the variation and reduce the cost.

According to a second aspect of the present invention, in the first aspect of the present invention, the phase angle changing means comprises at least a transmission line having a characteristic impedance that is the same as the predetermined impedance value and is arranged in the matching circuit. By changing the length of the transmission line, the phase angle of the reflection coefficient with respect to the above-mentioned predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit at the time of starting the electrodeless discharge lamp is changed. The input impedance of the matching circuit can be made constant by setting the length of the transmission line according to the variation of the induction coil and the variation of the induction coil at the time of starting.

According to a third aspect of the present invention, in the first aspect of the present invention, the phase angle changing means is composed of a circuit network composed of reactance elements, and the circuit network causes a high frequency oscillation circuit at the start of the electrodeless discharge lamp. It is characterized by changing the phase angle of the reflection coefficient with respect to the above-mentioned predetermined impedance value of the seen input impedance, and a circuit composed of reactance elements according to the variation of the induction coil and the variation of the induction coil at the start of the electrodeless discharge lamp. By setting the net, the input impedance of the matching circuit can be made constant.

According to a fourth aspect, in the invention of the first aspect,
When the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit at the time of starting the electrodeless discharge lamp is close to 0 °, the phase angle changing means is the highest frequency oscillation circuit of the matching circuit. It comprises a reactance element connected in parallel to the high-frequency electromagnetic field applying means on the side, and the phase angle is changed by changing the value of the reactance element. Further, in the invention of claim 5, In the invention of claim 1, when the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit at the time of starting the electrodeless discharge lamp is close to 180 °, the phase angle changing means is the above. It is connected in series to the above high-frequency electromagnetic field applying means on the most high-frequency oscillation circuit side of the matching circuit. It is composed of a reactance element, and is characterized in that the phase angle is changed by changing the value of the reactance element, and when the electrodeless discharge lamp is started, the reflection of the input impedance seen from the high frequency oscillation circuit with respect to the predetermined impedance value is reflected. The phase angle of the coefficient is 0
When the angle is close to 180 ° or 180 °, the input impedance can be easily made constant by adjusting the value of the variable reactance element provided on the most input side of the matching circuit according to the variation of the induction coil or the variation of the induction coil. .

According to a sixth aspect of the present invention, in the first aspect of the present invention, a transmission line whose characteristic impedance is at least equal to the predetermined impedance value is connected to the most high frequency oscillation circuit side of the matching circuit, and the transmission line is connected to the transmission line. Except for the phase angle of the reflection coefficient with respect to the above predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit side,
When the phase angle approaching means is close to the angle .degree., The phase angulation means comprises a reactance element connected in parallel to the high frequency electromagnetic field applying means on the most high frequency oscillation circuit side of the matching circuit except the transmission line. The phase angle is changed by changing the value of the characteristic of the matching circuit. Further, in the invention of claim 7, in the invention of claim 1, at least the characteristic impedance is provided on the most high frequency oscillation circuit side of the matching circuit. A transmission line having the same impedance value is connected, and the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit side excluding the transmission line is 18
When it is close to 0 °, the means for changing the phase angle comprises a reactance element connected in series to the high frequency electromagnetic field applying means on the most high frequency oscillation circuit side of the matching circuit. It is characterized in that the phase angle is changed by changing it, and the optimum value of the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit at the time of starting the electrodeless discharge lamp is 0 ° or Even when the angle is different from 180 °, the transmission line length is appropriately set, and the value of the variable reactance element provided on the most input side of the matching circuit is adjusted to make the input impedance constant.

According to the invention of claim 8, claims 1 to 7
In the invention of, at the time of starting the electrodeless discharge lamp,
The phase angle of the reflection coefficient of the input impedance of the matching circuit with respect to the predetermined impedance value is such that the output power from the high-frequency oscillator circuit is maximized, and both ends of the induction coil at the start of the electrodeless discharge lamp. It is possible to generate a large amount of power.

According to a ninth aspect of the present invention, in the first to seventh aspects of the invention, when the electrodeless discharge lamp is started, the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance of the matching circuit is the high frequency oscillation. The output power from the circuit is sufficient for starting the electrodeless discharge lamp, and the constituent elements of the high-frequency oscillator circuit are not destroyed.When starting the electrodeless discharge lamp, the lamp discharges across the induction coil. In addition to generating a sufficient voltage for starting, the burden on the high-frequency oscillation circuit is suppressed, and the electrodeless discharge lamp can be started stably.

The invention of claim 10 is characterized in that, in the invention of claim 6 or 7, the transmission line is constituted by a coaxial cable or a balanced cable. The invention of claim 11 is characterized in that, in the inventions of claims 3 to 7, the reactance element is composed of a capacitor. According to the invention of claim 12, there is no electrode through the electrodeless discharge lamp, the high frequency magnetic field applying means for applying a high frequency electromagnetic field to the electrodeless discharge lamp, and the high frequency magnetic field applying means for applying a high frequency electromagnetic field to the electrodeless discharge lamp. No electrode provided with a high-frequency oscillation circuit for generating high-frequency power supplied to the discharge lamp, a high-frequency magnetic field applying means for applying a high-frequency electromagnetic field to the electrodeless discharge lamp, and a matching circuit for matching impedance of the high-frequency oscillation circuit In the discharge lamp lighting device,
A first adjusting means for adjusting the constants of the constituent elements of the matching circuit so that the input impedance viewed from the high-frequency oscillation circuit becomes a predetermined impedance value consisting of substantially only a real number component when the electrodeless discharge lamp is stably lit. The matching circuit is provided with a second adjusting means for changing the input impedance of the electrodeless discharge lamp seen from the high-frequency oscillation circuit at the time of starting the electrodeless discharge lamp without substantially changing the input impedance when the electrodeless discharge lamp is stably lit. According to a thirteenth aspect of the present invention, in the twelfth aspect of the present invention, the second adjusting means of the matching circuit has the predetermined impedance of the human-power impedance seen from the high frequency oscillation circuit at the start of the electrodeless discharge lamp. Matching times when starting the electrodeless discharge lamp without changing the voltage standing wave ratio to the value The phase angle of the reflection coefficient of the input impedance of the electrode with respect to the above-mentioned predetermined impedance value is changed, and after the adjustment of the matching circuit when the lighting of the electrodeless discharge lamp is stable, the adjustment when starting the electrodeless discharge lamp is performed. Since it is possible to optimize the lighting stable state and the starting state by adjusting each time once, the matching circuit can be precisely adjusted and simplified.

According to the invention of claim 14, claim 12 or 1
In the invention of claim 3, the second adjusting means of the matching circuit changes the length of the transmission line whose characteristic impedance is the same as the predetermined impedance value. After adjusting the matching circuit at the time of stability, the transmission line length is adjusted at the start of the electrodeless discharge lamp, and the adjustment at the time of stable lighting and at the time of starting can be optimized by adjusting each time once. Precision and simplification can be achieved.

In the invention of claim 15, claim 12 or 1
In the invention of claim 3, when the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit at the time of starting the electrodeless discharge lamp is close to 0 °, the second adjusting means of the matching circuit is provided. The value of a reactance element connected in parallel to the high-frequency electromagnetic field applying means on the most high-frequency oscillation circuit side of the matching circuit is changed, and in the invention of claim 16, the invention of claim 12 or In the 13th invention,
When the phase angle of the reflection coefficient with respect to the above-mentioned predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit at the time of starting the electrodeless discharge lamp is close to 180 °, the second adjusting means of the matching circuit is the most effective one of the matching circuits. The high-frequency oscillation circuit side is characterized in that it changes the value of the reactance element connected in series to the high-frequency electromagnetic field applying means, and the input impedance of the high-frequency oscillation circuit when starting the electrodeless discharge lamp When the phase angle of the reflection coefficient for a predetermined impedance value is not close to 0 ° or 180 °, after adjusting the matching circuit when the electrodeless discharge lamp is lit stably, the matching circuit of the matching circuit when starting the electrodeless discharge lamp is adjusted. The adjustment is performed by adjusting the variable reactance element that is provided on the most input side of the matching circuit components. In performing, for stable when lighting adjustment of 1 degree and a state at the time of starting it can be optimized, thereby the refinement and simplification of the adjustment of the matching circuit. Claim 17
According to the invention of claim 12 or 13, the transmission line having at least a characteristic impedance equal to the predetermined impedance value is connected to the most high frequency oscillation circuit side of the matching circuit, and the high frequency oscillation is performed except for the transmission line. When the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance viewed from the circuit side is close to 0 °, the second adjusting means of the matching circuit,
Characterized in that the phase angle is changed by adjusting a reactance element connected in parallel to the high-frequency electromagnetic field applying means on the most high-frequency oscillation circuit side of the matching circuit except the transmission line, According to the invention of claim 18, in the invention of claim 12 or 13, a transmission line whose characteristic impedance is at least the same as the predetermined impedance value is connected to the highest frequency oscillation circuit side of the matching circuit, and the transmission line is connected. Except when the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit side is close to 180 °, the second adjusting means of the matching circuit excludes the transmission line and performs the matching. A rear connected in series to the above high-frequency electromagnetic field applying means on the side of the highest-frequency oscillator circuit of the circuit. It is characterized in that the phase angle is changed by adjusting a closet element, and the phase angle of the reflection coefficient with respect to a predetermined impedance value of the input impedance seen from the high frequency oscillation circuit at the start of the electrodeless discharge lamp is 0 ° or Even if it is not close to 180 °, by adjusting the length of the transmission line properly, after adjusting the matching circuit when the lighting of the electrodeless discharge lamp is stable, the matching circuit when starting the electrodeless discharge lamp is adjusted. Can be adjusted by adjusting the variable reactance element provided on the most input side of the constituent elements of the matching circuit.

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings. The electrodeless discharge lamp lighting device in each of the following embodiments has the same configuration as that of the conventional example with respect to the configuration other than the matching circuit and the reactance varying means, and the common portions are denoted by the same reference numerals, and the description will be omitted. Omit it.

(Embodiment 1) FIG. 2 shows a schematic block diagram of an electrodeless discharge lamp lighting device of this embodiment. A detailed view of the matching circuit portion is shown in FIG. As shown in FIG.
The electrodeless discharge lamp lighting device of the present embodiment is similar to the conventional example shown in FIG. 15, an electrodeless discharge lamp 1, an induction coil 2 arranged near the outer periphery of the electrodeless discharge lamp 1, and an induction coil. A high-frequency oscillator circuit 4 for generating high-frequency power to be supplied to the electrodeless discharge lamp 1 via 2, and a direct-current power source 5 for converting the alternating-current power from the alternating-current power supply AC into direct-current power and supplying it to the high-frequency oscillator circuit 4; 2 and a matching circuit 3 for impedance matching the high frequency oscillation circuit 4, but has a configuration different from the conventional example in the following points.

That is, as shown in FIG. 1, the matching circuit 3 has a matching circuit 3 when the electrodeless discharge lamp 1 is started.
As the adjusting means, a 100 cm coaxial cable having a characteristic impedance of 50Ω and using polyethylene as an insulator is provided as the transmission line 6a on the input side. The matching circuit 3 is designed so that the input impedance Z ₃ of the matching circuit 1 viewed from the high frequency oscillation circuit 4 has a predetermined impedance value (50 Ω in this case) consisting of only a real component when the electrodeless discharge lamp 1 is stably lit. Moreover, even when the electrodeless discharge lamp 1 is started, the output power of the high-frequency oscillation circuit 4 has an impedance value that is sufficient to start the electrodeless discharge lamp 1. In this embodiment, the phase angle P ₃ of the reflection coefficient of the input impedance Z ₃ at the start of the electrodeless discharge lamp 1 including the transmission line with respect to the above-mentioned predetermined input impedance value is 0 °. Table 1 shows the constants of the capacitors C _{1 to} C ₃ which are constituent elements of the matching circuit 3.
Table 2 shows the input impedances Z _{1 to} Z ₃ of the respective parts when the electrodeless discharge lamp 1 is stably lit and when it is started. Also, input impedances Z ₂ and Z ₃ are characteristic impedances of 50Ω.
FIG. 3 shows a plot on the Smith chart of FIG. In Figure 3, point a is the input impedance Z when the lamp is on stably.
₃ is the input impedance Z ₃ at the time of starting the lamp,
C indicates the input impedance Z ₂ when the lamp is started, respectively.

[0026]

[Table 3]

[0027]

[Table 4]

By the way, as described above, when the electrodeless discharge lamp 1 is started, the induction coil 2 and the matching circuit 3 are in a state where the Q is very high. Due to variations in the elements used, the input impedance Z ₃ seen from the high-frequency oscillator circuit 4 when viewed from the load side changes significantly. Input impedance Z when the electrodeless discharge lamp 1 is stable in lighting
_When the constant of the matching circuit 3 is adjusted so that ₃ becomes a predetermined impedance value, the input impedance Z ₃ of the matching circuit 3 at the time of starting the electrodeless discharge lamp 1 is the above predetermined impedance value due to variations in reactance components. It has been found that only the phase angle varies when the reflection coefficient for is almost constant. For example,
When the reactance value of the induction coil 2 is ± 3% and the capacitance value of the capacitor C ₁ of the matching circuit 3 is ± 5%, a variable capacitor is used for the capacitors C ₂ and C ₃ of the matching circuit 3 to perform electrodeless discharge. When the lighting of the lamp 1 is stable, the input impedance Z ₃ of the matching circuit ₃ is 5
FIG. 4 shows a plot (indicated by an arc D) of the variation of the input impedance Z ₃ of the matching circuit 3 at the time of starting the electrodeless discharge lamp 1 when it is adjusted to 0 Ω on a Smith chart of the characteristic impedance of 50 Ω. .

Based on the above findings, a transmission line 6a having the same characteristic impedance as the input impedance value, that is, a coaxial cable is provided at a position where a predetermined input impedance value is obtained when the electrodeless discharge lamp 1 is stably lit. Then, the transmission line length is adjusted when the electrodeless discharge lamp 1 is started. In this case, by adjusting the length of the coaxial cable constituting the transmission line 6a from 5 cm to 139 cm according to the matching circuit 3, the matching circuit 3 at the time of starting the electrodeless discharge lamp 1 as shown in Table 5.
The phase angle P ₃ of the input impedance can be made substantially constant. Further, since the characteristic impedance of the transmission line 6a is the same as the input impedance Z ₂ of the matching circuit 3 during the stable lamp lighting, there is almost no effect due to the change in length. That is, it becomes possible to almost completely adjust the set value of the input impedance Z ₃ of the matching circuit 3 as shown in FIG.

As a result, the input impedance of the matching circuit 3 can be made substantially constant regardless of variations in the reactance component of the induction coil 2, and the starting and lighting of the electrodeless discharge lamp 1 can be stabilized. It is not necessary to extremely reduce the tolerance of the capacitors C _{1 to} C ₃ , which are the constituent elements of the induction coil 2 and the matching circuit 3, and the cost can be reduced.

[0031]

[Table 5]

(Embodiment 2) In this embodiment, the structure of the electrodeless discharge lamp lighting device is the same as that of the embodiment 1, and therefore, illustration and description thereof are omitted. A detailed view of the matching circuit 3 of the present embodiment is shown in FIG. In the present embodiment, the matching circuit 3 is not provided with a transmission line, but as in the case of the first embodiment, the input impedance Z ₅ of the matching circuit 3 is 5 when the lighting of the electrodeless discharge lamp 1 is stable.
It becomes 0Ω and the input impedance Z ₅ at start is 50Ω.
The circuit constant is set so that the phase angle P ₅ of the reflection coefficient with respect to is 0 °.

Table 6 shows the capacitance values of the capacitors C _{4 to} C ₆ which are the constituent elements of the matching circuit 3, and Table 7 shows the values of the input impedances Z ₅ and Z ₄ of each part when the lighting is stable and when starting.

[0034]

[Table 6]

[0035]

[Table 7]

When the reactance value of the induction coil 2 is ± 3% and the capacitance value of the capacitor C ₄ of the matching circuit 3 is ± 5%, the electrodeless discharge lamp 1NO.
The input impedance Z ₅ of the matching circuit 3 at the time of starting varies as shown in FIG. FIG. 6 is a plot (indicated by an arc A) of variations in the input impedance Z ₅ of the matching circuit 3 at the start of the electrodeless discharge lamp 1 on the Smith chart of the characteristic impedance of 50Ω.

On the other hand, by adjusting the capacitor C ₆ which is a variable capacitor of the matching circuit 3 again at the time of starting the lamp, the input impedance Z of the matching circuit 3 at the time of starting the electrodeless discharge lamp 1 as shown in Table 8.
The phase angle P ₅ of the reflection coefficient with respect to 50Ω of ₃ can be made almost constant. Input impedance Z ₅ of the matching circuit 3 at the time of starting the electrodeless discharge lamp 1 after adjustment
7 is plotted (B in the figure) on the Smith chart of the characteristic impedance of 50Ω.

[0038]

[Table 8]

Further, although the input impedance Z ₅ of the matching circuit 3 at the time of stable lighting deviates from the predetermined 50Ω by the adjustment at the start of the electrodeless discharge lamp, the standing wave ratio to 50Ω is about 1.4 or less, There is no problem in practical use. The input impedance Z ₅ of the matching circuit 1 at the time of stable lighting of the lamp is shown in FIG. 8 which is plotted (C in the figure) on the Smith chart of the characteristic impedance of 50Ω.

In this embodiment, when the lighting of the electrodeless discharge lamp 1 is stable, the adjustment part in the matching circuit 3 is the capacitor C.
₅ and C ₆ , and the adjustment point at the time of starting is the capacitor C ₆ . That is, after adjusting the capacitance of the capacitor C _5, C ₆ to stable lighting time, although to adjust the capacitor C ₆ again lamp starting conditions, it may be provided separately of course stable lighting time and the adjustment locations at startup.

Further, the phase angle of the reflection coefficient with respect to a predetermined impedance value is close to 0 ° when the electrodeless discharge lamp 1 is started, and the matching circuit 3 of the present embodiment is not limited to the configuration and the constants of the matching circuit 3 of the present embodiment. If the element on the most input side is a reactance element in parallel with the induction coil 2, the adjustment as described above becomes possible. Further, even when the phase angle of the reflection coefficient with respect to a predetermined impedance value is close to 180 ° when the electrodeless discharge lamp 1 is started, and the element on the most input side of the matching circuit 3 is a reactance element in series with the induction coil 2. , The input impedance Z of the matching circuit 1 at the time of starting by adjusting this reactance element
₅ adjustments are possible.

As a result, the input impedance Z ₅ of the matching circuit 3 can be made substantially constant regardless of variations in the reactance component of the induction coil 2 with a relatively simple adjustment, and the electrodeless discharge lamp 1 can be started. In addition, the lighting can be stabilized, and the tolerance of the elements forming the induction coil 2 and the matching circuit 3 does not need to be extremely small, and the cost can be reduced. (Third Embodiment) In this embodiment, the configuration of the electrodeless discharge lamp lighting device is the same as that of the first embodiment, and therefore illustration and description thereof will be omitted. Further, FIG. 9 shows a detailed view of the matching circuit 3 of this embodiment.

The matching circuit 3 has a structure in which a coaxial cable, which is the transmission line 6b, is further provided in the second embodiment. Table 9 shows the constants of the matching circuit 3.

[0044]

[Table 9]

Also in this embodiment, as in the case of the first embodiment, when the lighting of the electrodeless discharge lamp 1 is stable, the input impedance Z ₈ of the matching circuit 3 becomes 50Ω, and the reflection coefficient of the input impedance Z ₇ at the time of starting to 50Ω. The phase angle P ₇ is set to 0 degree. That is, in the present embodiment, the phase angle of the reflection coefficient with respect to the predetermined impedance 50Ω of the input impedance Z ₇ excluding the transmission line 6b at the time of starting the electrodeless discharge lamp 1 is close to 0 °, and is parallel to the induction coil 2 on the human power side. It is characterized in that it is provided with an adjusting capacitor C ₉ connected to, and is further provided with a transmission line 6b. With this configuration, the transmission line 6b
By appropriately setting the length of the coaxial cable, the phase angle P ₈ of the reflection coefficient with respect to the constant impedance value of the input impedance Z ₈ viewed from the high frequency oscillation circuit 3 at the time of starting the electrodeless discharge lamp 1 is an appropriate value. Even if is not near 0 °, the adjustment method of the second embodiment can be applied, and it becomes possible to reduce the variation in the phase angle P ₈ at the time of starting the lamp.

In the present embodiment, a coaxial cable having a characteristic impedance of 50Ω and polyethylene as an insulator is used as the transmission line 6b, and its length is 185 cm.
By setting the value of the phase angle P ₈ at the start of the lamp to −
90 °. Table 10 shows the value of each input impedance
Shown in The details of the adjustment method and the result thereof are the same as those in the second embodiment, and therefore will be omitted.

[0047]

[Table 10]

As a result, no matter what the proper value of the input impedance at the time of starting the lamp as viewed from the high frequency oscillation circuit 3, the input impedance of the matching circuit 3 will be irrespective of variations in the reactance component of the induction coil 2. Can be made substantially constant by a relatively simple adjustment, the starting and lighting of the electrodeless discharge lamp 1 can be stabilized, and the tolerance of the elements forming the induction coil 2 and the matching circuit 3 can be made extremely small. It becomes unnecessary to reduce the cost.

(Embodiment 4) In Embodiments 1 and 3 described above, coaxial cables are used for the transmission lines 6a and 6b to achieve matching.
As shown in 0, the input impedance of the matching circuit 3 is adjusted to an optimum value by the coaxial cable used for the transmission line 6c between the high frequency oscillation circuit 4 and the matching circuit 3.

That is, when the load is connected to one end of the coaxial cable, the input impedance Zs seen from the other end is the impedance of the load regardless of the length of the coaxial cable when the load is equal to the characteristic impedance Z ₀ of the coaxial cable. When the characteristic impedance is different from Z ₀ , the coaxial cable is extended to rotate clockwise on an equal circle on the Smith chart as shown in FIG. 11 (Z
s → Zs ₀ ) Instead of changing the constants and configuration of the matching circuit 3 to obtain the optimum value Zs ₀ from this point, the characteristic impedance Z ₀ is the input impedance of the matching circuit 3 when the lamp is lit (that is, A-A in FIG. 10). Zs ₀ can be obtained by connecting a coaxial cable having a length substantially equal to (the impedance viewed from the load side from ′) as needed.

FIG. 1 shows the present embodiment made in view of this point.
2 will be described. Now, it is assumed that the impedance L _T when the lamp is lit and the impedance Ls at the time of starting when the load side is viewed from BB ′ are as follows. L _T = 7.3 + j114 Ls = 0.8 + j115 A matching circuit composed of a capacitor C ₂₀ in series in order from the induction coil 22 and a capacitor C ₂₁ in parallel 3 ₁ (FIG. 12 (a)), and an induction coil 2 in parallel. A matching circuit composed of a capacitor C ₃₀ and a capacitor C ₃₁ in series is denoted by 3 ₂ (FIG. 12B). Now, when the matching circuits 3 ₁ and 3 ₂ are configured with the input impedance Z _T at the time of lighting being 50 Ω, the capacitors C ₂₀ and C ₂₁ ,
The capacitance values of C ₃₀ and C ₃₁ are C ₂₁ = 121.8 pF and C ₂₁ =
567.7 pF, C ₃₀ = 638 pF, C ₃₁ = 39.8 p
F. Letting Zs ₁ and Zs ₂ be load impedances (impedances seen from the load side from AA ′) at the time of starting the matching circuits 3 ₁ and 3 ₂ , respectively, Zs ₁ = 7
1.1 + j160.8 and Zs ₂ = 5.7 + J11.8.

Here, when Zs ₀ = 465 + j0, the coaxial cable length l ₁ required to move Zs ₁ to Zs ₀ and the coaxial cable length l ₂ required to move Zs ₂ to Zs ₀ are given. Ask. In FIG. 13, the moving angles θ ₁ and θ ₂ are about 29.5 ° and 153 °. If operating frequency is 13.56MHz, one wavelength is 22.12m
Becomes In the coaxial cable, it is about 2/3, so one wavelength is 14.7 m. Since the Smith chart rotates 360 ° around the half-wavelength of 7.4 m, in order to rotate θ, l ₀ = θ / 360 × 7.4 Therefore, l ₁ = 0.6 m l ₂ = 3.15 m.
The length l ₀ of the coaxial cable constituting the transmission line 6c is changed to l ₁
If it is determined within the range of ≦ l ₀ ≦ l ₂ , the matching circuit 3 can be composed of only a capacitor, and an efficient electrodeless discharge lamp lighting device can be composed.

For example, if the length of the coaxial cable is set to 100 cm, the values of the capacitors C _{40 to} C ₄₂ in the matching circuit 3 having the π type structure as shown in FIG. 32.7 pF, 81.9 pF,
By setting 347.6 pF, Z _T = 50Ω, Zs ₀ =
At the time of lighting of 465Ω, the optimum condition at the time of starting can be obtained at the same time.

By the way, the load impedance in the matching circuit 3 composed of only capacitors is limited to the range from Zs ₁ to Zs ₂ counterclockwise on a circle having a constant SWR passing through Zs ₁ (or Zs ₂ ). . Therefore, l ₁ ≦
If a coaxial cable of 200 cm in the range of l ₀ ≦ l ₂ is used, no matter what kind of matching circuit 3 composed of only a capacitor is connected, it does not largely deviate from the load impedance Zs ₀ and approximate matching can be achieved. . Therefore, in the case of the electrodeless discharge lamp lighting device in which the optimum load impedance is substantially equal at the time of starting, it is not necessary to readjust the coaxial cable length for each matching circuit 3.

Incidentally, the transmission lines 6a to 6 of the first, third and fourth embodiments.
A balanced feeder wire may be used for c instead of the coaxial cable.

[0056]

According to the invention of claim 1, an electrodeless discharge lamp, a high frequency magnetic field applying means for applying a high frequency electromagnetic field to the electrodeless discharge lamp, and a high frequency magnetic field applying means for applying a high frequency electromagnetic field to the electrodeless discharge lamp. In an electrodeless discharge lamp lighting device, comprising: a high-frequency oscillation circuit for generating high-frequency power supplied to an electrodeless discharge lamp via a high-frequency electromagnetic field; and a matching circuit for matching impedance of the high-frequency electromagnetic field applying means and the high-frequency oscillation circuit. The matching circuit is configured so that the input impedance viewed from the high frequency oscillation circuit when the lighting of the electrodeless discharge lamp is stable becomes a predetermined impedance value that substantially includes only the real number component, and when the electrodeless discharge lamp lighting is stable. The input impedance seen from the high-frequency oscillator circuit when starting an electrodeless discharge lamp without changing the input impedance Since the phase angle changing means for changing the phase angle of the reflection coefficient with respect to the predetermined impedance value of the impedance is provided, the matching circuits can be adjusted independently for different states of the electrodeless discharge lamp during stable lighting and starting. As a result, the matching circuit can be adjusted precisely and easily. Further, since the input impedance of the matching circuit can be normalized regardless of the variation of the induction coil and the variation of the constituent elements of the matching circuit, it is possible to set a large allowable value of the variation and reduce the cost. There is an effect.

According to a second aspect of the present invention, in the first aspect of the invention, the phase angle changing means comprises at least a transmission line having a characteristic impedance that is the same as the predetermined impedance value and is arranged in the matching circuit. By changing the length of the transmission line, the phase angle of the reflection coefficient with respect to the above-mentioned predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit at the time of starting the electrodeless discharge lamp is changed. In, there is an effect that the input impedance of the matching circuit can be made constant by setting the length of the transmission line according to the variation of the induction coil and the variation of the induction coil.

According to a third aspect of the present invention, in the first aspect of the present invention, the phase angle changing means is composed of a circuit network composed of reactance elements, and by the circuit network, a high frequency oscillation circuit at the time of starting the electrodeless discharge lamp is used. Since the phase angle of the reflection coefficient of the observed input impedance with respect to the above-mentioned predetermined impedance value is changed, a circuit network composed of reactance elements is set according to the variation of the induction coil and the variation of the induction coil when the electrodeless discharge lamp is started. By doing so, there is an effect that the input impedance of the matching circuit can be made constant.

According to a fourth aspect of the present invention, in the case of the first aspect of the invention, when the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit at the time of starting the electrodeless discharge lamp is close to 0 °. , The phase angle changing means comprises a reactance element connected in parallel to the high frequency electromagnetic field applying means on the most high frequency oscillation circuit side of the matching circuit, and the phase angle is changed by changing the value of the reactance element. In the invention of claim 5, the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit at the time of starting the electrodeless discharge lamp is 180 °. When the phase angle changing means is close to the high frequency oscillation circuit side of the matching circuit, It is composed of a reactance element connected in series to the magnetic field applying means, and the phase angle is changed by changing the value of the reactance element, so that the input impedance seen from the high frequency oscillation circuit at the time of starting the electrodeless discharge lamp. When the phase angle of the reflection coefficient with respect to the above predetermined impedance value is close to 0 ° or 180 °, the value of the variable reactance element provided at the most input side of the matching circuit according to the variation of the induction coil or the variation of the induction coil. There is an effect that the input impedance can be easily made constant by adjusting.

According to a sixth aspect of the present invention, in the first aspect of the present invention, a transmission line whose characteristic impedance is at least the same as the predetermined impedance value is connected to the most high frequency oscillation circuit side of the matching circuit, and the transmission line is connected. Except when the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance as viewed from the high frequency oscillation circuit side is close to 0 °, the phase angle conversion means excludes the transmission line and causes the highest frequency oscillation of the matching circuit. The phase angle is changed by changing the value of the reactance element, which is composed of a reactance element connected in parallel to the high-frequency electromagnetic field applying means on the circuit side. In the first aspect of the present invention, at least the characteristic impedance is provided on the most high frequency oscillation circuit side of the matching circuit. If the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance viewed from the side of the high frequency oscillation circuit is close to 180 ° by connecting a transmission line having the same impedance value as that of The means for changing the angle comprises a reactance element connected in series with the high frequency electromagnetic field applying means on the most high frequency oscillation circuit side of the matching circuit, and the phase angle is changed by changing the value of the reactance element. Therefore, even when the optimum value of the phase angle of the reflection coefficient with respect to the above predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit at the time of starting the electrodeless discharge lamp is different from 0 ° or 180 °, the transmission line length is changed. By setting it appropriately, the variable resistor provided on the most input side of the matching circuit. There is an effect that attained a certain reduction of the input impedance by adjusting the value of the reactance element.

According to an eighth aspect of the present invention, in the first to seventh aspects of the invention, when the electrodeless discharge lamp is started, the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance of the matching circuit is the high frequency oscillation. Since the output power from the circuit is maximized,
There is an effect that a large amount of electric power can be generated across the induction coil when the electrodeless discharge lamp is started.

According to a ninth aspect of the present invention, in the first to seventh aspects of the invention, when the electrodeless discharge lamp is started, the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance of the matching circuit is the high frequency oscillation. Since the output power from the circuit is sufficient for starting the electrodeless discharge lamp and the constituent elements of the high frequency oscillation circuit are not destroyed, it is sufficient to start the discharge of the lamp across the induction coil when starting the electrodeless discharge lamp. There is an effect that the voltage is generated and the load on the high frequency oscillation circuit is suppressed, and the electrodeless discharge lamp can be stably started.

According to a tenth aspect of the invention, in the invention according to the sixth or seventh aspect, the transmission line is constituted by a coaxial cable or a balanced cable, which is inexpensive in cost. According to the invention of claim 11, in the invention of claims 3 to 7, since the reactance element is composed of a capacitor, the structure of the matching circuit is simple.

According to a twelfth aspect of the present invention, there is provided an electrodeless discharge lamp, a high frequency magnetic field applying means for applying a high frequency electromagnetic field to the electrodeless discharge lamp, and a high frequency magnetic field applying means for applying a high frequency electromagnetic field to the electrodeless discharge lamp. A high-frequency oscillator circuit for generating high-frequency power supplied to the electrodeless discharge lamp, a high-frequency magnetic field applying means for applying a high-frequency electromagnetic field to the electrodeless discharge lamp, and a matching circuit for matching impedance of the high-frequency oscillator circuit. In the electrodeless discharge lamp lighting device, the constants of the constituent elements of the matching circuit are set so that the input impedance viewed from the high-frequency oscillation circuit becomes a predetermined impedance value consisting of substantially only real components when the electrodeless discharge lamp lighting is stable. The first adjustment means to adjust the input impedance and the input impedance when the electrodeless discharge lamp lighting is stable And the second adjusting means for changing the input impedance viewed from the high frequency oscillating circuit at the time of starting the electrodeless discharge lamp. The second adjusting means of the electrodeless discharge lamp is matched at the time of starting the electrodeless discharge lamp without changing the voltage standing wave ratio with respect to the above-mentioned predetermined impedance value of the human-powered impedance viewed from the high frequency oscillation circuit. Since the phase angle of the reflection coefficient of the input impedance of the circuit with respect to the above-mentioned predetermined impedance value is changed, the adjustment at the start of the electrodeless discharge lamp can be performed after the adjustment of the matching circuit when the lighting of the electrodeless discharge lamp is stable. , It is possible to optimize the state of stable lighting and starting at the time of each adjustment. There is an effect that densification and simplification can be achieved.

The invention of claim 14 is the invention of claim 12 or 13.
In the invention, since the second adjusting means of the matching circuit changes the length of the transmission line whose characteristic impedance is the same as the predetermined impedance value, matching at the time of stable lighting of the electrodeless discharge lamp is achieved. After adjusting the circuit, the transmission line length is adjusted at the start of the electrodeless discharge lamp, and the adjustment of the matching circuit can be made precise and simple because the state at lighting stable and at the start can be optimized by adjusting each once. There is an effect that it can be realized.

The invention of claim 15 is the same as claim 12 or 13.
In the invention described above, when the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit at the time of starting the electrodeless discharge lamp is close to 0 °, the second adjusting means of the matching circuit is Since the value of the reactance element connected in parallel to the high frequency electromagnetic field applying means is changed on the most high frequency oscillation circuit side of the matching circuit, the invention of claim 16 is the invention of claim 12 or 13. When the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit at the start of the electrodeless discharge lamp is close to 180 °, the second adjusting means of the matching circuit is the matching circuit. Reactor connected in series to the above high-frequency electromagnetic field applying means on the side of the most high-frequency oscillation circuit Since the value of the reflection element is changed, when the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance seen from the high frequency oscillation circuit at the start of the electrodeless discharge lamp is not close to 0 ° or 180 °, After adjusting the matching circuit when the electrodeless discharge lamp is lit stably, adjustment of the matching circuit when starting the electrodeless discharge lamp can be performed by adjusting the variable reactance element that is provided at the most input side of the elements of the matching circuit. Since the state at the time of stable lighting and the state at the time of starting can be optimized by each adjustment once, there is an effect that the adjustment of the matching circuit can be made precise and simplified.

The seventeenth aspect of the invention is the twelfth or thirteenth aspect.
In the invention, the transmission line whose characteristic impedance is at least the same as the predetermined impedance value is connected to the most high frequency oscillation circuit side of the matching circuit, and the input impedance as seen from the high frequency oscillation circuit side excluding the transmission line is When the phase angle of the reflection coefficient with respect to the predetermined impedance value is close to 0 °, the second adjusting means of the matching circuit applies the high frequency electromagnetic field on the most high frequency oscillation circuit side of the matching circuit except the transmission line. Since the reactance element connected in parallel to the means is adjusted to change the phase angle, the invention of claim 18 is the invention of claim 12 or 13, wherein the matching circuit has the highest frequency oscillation. Transmission to the circuit side, at least the characteristic impedance of which is the same as the above specified impedance value Connect the road, the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit side except the transmission line is 18
When it is close to 0 °, the second adjusting means of the matching circuit is a reactance element connected in series to the high frequency electromagnetic field applying means on the most high frequency oscillation circuit side of the matching circuit except the transmission line. Is adjusted to change the phase angle, the phase angle of the reflection coefficient is not close to 0 ° or 180 ° with respect to the predetermined impedance value of the input impedance seen from the high frequency oscillation circuit at the start of the electrodeless discharge lamp. In this case, by adjusting the length of the transmission line appropriately, after adjusting the matching circuit when the electrodeless discharge lamp is lit stably, the matching circuit is adjusted when the electrodeless discharge lamp is started. There is an effect that it can be performed by adjusting the variable reactance element provided on the most input side of the constituent element.

[Brief description of drawings]

FIG. 1 is a detailed view of a matching circuit portion of an electrodeless discharge lamp lighting device according to a first embodiment of the present invention.

FIG. 2 is a schematic block diagram of the above electrodeless discharge lamp lighting device.

FIG. 3 is a Smith chart showing a setting value of an input impedance of the above matching circuit.

FIG. 4 is a Smith chart showing variations in the input impedance of the matching circuit when the lamp is started.

FIG. 5 is a detailed view of a matching circuit portion of the electrodeless discharge lamp lighting device according to the second embodiment of the present invention.

FIG. 6 is a Smith chart showing variations in the input impedance of the matching circuit when the lamp is started.

FIG. 7 is a Smith chart showing the adjustment result of the input impedance of the matching circuit when the lamp is started.

FIG. 8 is a Smith chart showing the adjustment result of the input impedance of the matching circuit when the lamp lighting is stable.

FIG. 9 is a detailed view of a matching circuit portion of the electrodeless discharge lamp lighting device according to the third embodiment of the present invention.

FIG. 10 is a configuration diagram of a main part of an electrodeless discharge lamp lighting device according to a third embodiment of the present invention.

FIG. 11 is a Smith chart for explaining the principle of the above.

FIG. 12 is a circuit diagram of a matching circuit for specific description in the above.

FIG. 13 is a Smith chart for explaining the operation of FIG. 12 above.

FIG. 14 is a circuit diagram of a matching circuit of a specific example of the above.

FIG. 15 is an example of a schematic block diagram of an electrodeless discharge lamp lighting device.

FIG. 16 is an example of a detailed view of a matching circuit portion of the electrodeless discharge lamp lighting device.

FIG. 17 is a Smith chart showing an example of set values of input impedance of the matching circuit of the above.

FIG. 18 is a Smith chart showing an example of variations in the input impedance of the matching circuit when the lamp is started.

[Explanation of symbols]

1 electrodeless discharge lamp 2 induction coil 3 matching circuit 4 high frequency oscillating circuit 6a transmission line C _{1 to} C ₃ capacitors Z _{1 to} Z ₃ input impedance of each part of matching circuit P2, P3 phase angle of reflection coefficient for 50Ω

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shin Ogawa, 1048, Kadoma, Kadoma, Osaka Prefecture, Matsushita Electric Works Co., Ltd. (72) Shohei Yamamoto, 1048, Kadoma, Kadoma, Osaka Prefecture (72) Inventor Saimi Motohiro 1048 Kadoma, Kadoma City, Osaka Prefecture, Matsushita Electric Works Co., Ltd. (72) Inventor, Yuji Kumagai, 1048 Kadoma, Kadoma City, Osaka Matsushita Electric Works, Ltd.

Claims (18)

[Claims] 1. An electrodeless discharge lamp, a high frequency magnetic field applying means for applying a high frequency electromagnetic field to the electrodeless discharge lamp, and a high frequency oscillating circuit for generating high frequency power supplied to the electrodeless discharge lamp via the high frequency magnetic field applying means. And a matching circuit for matching the impedances of the high-frequency electromagnetic field applying means and the high-frequency oscillating circuit, in the electrodeless discharge lamp lighting device, wherein the matching circuit is operated from the high-frequency oscillating circuit during stable lighting of the electrodeless discharge lamp. A high-frequency oscillator circuit that is configured so that the input impedance that it sees has a predetermined impedance value that is substantially composed of only real number components, and that the input impedance when the electrodeless discharge lamp is stable is not substantially changed and that the electrodeless discharge lamp is started. The phase of the reflection coefficient with respect to the above specified impedance value of the input impedance viewed from An electrodeless discharge lamp lighting apparatus characterized by having a phase angle changing means for changing the. 2. The phase angle changing means comprises at least a transmission line having a characteristic impedance that is arranged in the matching circuit and is equal to the predetermined impedance value, and is capable of changing the length of the transmission line. 2. The electrodeless discharge lamp lighting device according to claim 1, wherein the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit at the time of starting the electrode discharge lamp is changed. 3. The phase angle changing means is composed of a circuit network composed of reactance elements, and the circuit network reflects the input impedance viewed from the high frequency oscillation circuit at the start of the electrodeless discharge lamp with respect to the predetermined impedance value. The electrodeless discharge lamp lighting device according to claim 1, wherein the phase angle of the coefficient is changed. 4. When the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit at the time of starting the electrodeless discharge lamp is close to 0 °, the phase angle changing means is the matching circuit. 3. The phase angle is changed by a reactance element connected in parallel to the high-frequency electromagnetic field applying means on the most high-frequency oscillation circuit side of the device, and the value of the reactance element is changed. The electrodeless discharge lamp lighting device described. 5. When the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit at the time of starting the electrodeless discharge lamp is close to 180 °, the phase angle changing means has the matching circuit. 2. The phase angle is changed by a reactance element connected in series to the high-frequency electromagnetic field applying means on the most high-frequency oscillation circuit side of the device, and the value of the reactance element is changed. The electrodeless discharge lamp lighting device described. 6. A transmission line having at least a characteristic impedance equal to the predetermined impedance value is connected to the most high-frequency oscillator circuit side of the matching circuit, and the input impedance of the high-frequency oscillator circuit side excluding the transmission line is measured. When the phase angle of the reflection coefficient with respect to the predetermined impedance value is close to 0 °, the phase angulation means removes the transmission line from the high frequency oscillating circuit side of the matching circuit with respect to the high frequency electromagnetic field applying means. 2. The electrodeless discharge lamp lighting device according to claim 1, comprising reactance elements connected in parallel, wherein the phase angle is changed by changing a value of the reactance elements. 7. A transmission line whose characteristic impedance is at least the same as the predetermined impedance value is connected to the most high-frequency oscillator circuit side of the matching circuit, and the input impedance of the input impedance seen from the high-frequency oscillator circuit side is excluded except the transmission line. When the phase angle of the reflection coefficient with respect to the predetermined impedance value is close to 180 °, the means for changing the phase angle is connected in series to the high frequency electromagnetic field applying means on the most high frequency oscillation circuit side of the matching circuit. 2. The electrodeless discharge lamp lighting device according to claim 1, further comprising a reactance element, wherein the phase angle is changed by changing a value of the reactance element. 8. The phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance of the matching circuit at the time of starting the electrodeless discharge lamp is such that the output power from the high frequency oscillating circuit is maximized. The electrodeless discharge lamp lighting device according to any one of claims 1 to 7. 9. When the electrodeless discharge lamp is started, the phase angle of the reflection coefficient of the input impedance of the matching circuit with respect to the predetermined impedance value is such that the output power from the high frequency oscillator circuit is sufficient for starting the electrodeless discharge lamp. 8. The electrodeless discharge lamp lighting device according to claim 1, wherein the constituent elements of the high frequency oscillation circuit are not destroyed. 10. The electrodeless discharge lamp lighting device according to claim 6 or 7, wherein the transmission line is formed of a coaxial cable or a balanced cable. 11. The electrodeless discharge lamp lighting device according to claim 3, wherein the reactance element is composed of a capacitor. 12. An electrodeless discharge lamp through an electrodeless discharge lamp, a high frequency magnetic field applying means for applying a high frequency electromagnetic field to the electrodeless discharge lamp, and a high frequency magnetic field applying means for applying a high frequency electromagnetic field to the electrodeless discharge lamp. Electrodeless discharge lamp including a high-frequency oscillation circuit for generating high-frequency power to be supplied to the electrodeless discharge lamp, a high-frequency magnetic field applying means for applying a high-frequency electromagnetic field to the electrodeless discharge lamp, and a matching circuit for matching impedance of the high-frequency oscillation circuit In a lighting device, the constants of the constituent elements of the matching circuit are adjusted so that the input impedance viewed from the high-frequency oscillation circuit becomes a predetermined impedance value that is substantially composed of only real number components when the electrodeless discharge lamp is lit stably. Of the electrodeless discharge lamp without changing the input impedance when the electrodeless discharge lamp is lit and stable. Discharge lamp electrodeless discharge lamp lighting device according to a second adjusting means for varying the input impedance viewed from the high-frequency oscillator at the start, characterized in that provided in the matching circuit of. 13. The second adjusting means of the matching circuit does not change the voltage standing wave ratio with respect to the predetermined impedance value of the human-powered impedance seen from the high-frequency oscillation circuit at the time of starting the electrodeless discharge lamp. 13. The electrodeless discharge lamp lighting device according to claim 12, wherein a phase angle of a reflection coefficient with respect to the predetermined impedance value of an input impedance of a matching circuit at the time of starting the electrode discharge lamp is changed. 14. The second adjusting means of the matching circuit changes the length of a transmission line whose characteristic impedance is the same as the predetermined impedance value. Electrodeless discharge lamp lighting device. 15. The second adjusting means of the matching circuit, when the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit when starting the electrodeless discharge lamp is close to 0 °. 13. The value of a reactance element connected in parallel to the high frequency electromagnetic field applying means on the most high frequency oscillation circuit side of the matching circuit is changed.
Or the electrodeless discharge lamp lighting device according to item 13. 16. The second adjusting means of the matching circuit when the phase angle of the reflection coefficient with respect to the predetermined impedance value of the input impedance viewed from the high frequency oscillation circuit when starting the electrodeless discharge lamp is close to 180 °. 14. The electrodeless discharge lamp according to claim 12, wherein a value of a reactance element connected in series to the high frequency electromagnetic field applying means is changed on the most high frequency oscillation circuit side of the matching circuit. Lighting device. 17. A transmission line having a characteristic impedance at least equal to the predetermined impedance value is connected to the most high-frequency oscillator circuit side of the matching circuit, and the input impedance of the input impedance seen from the high-frequency oscillator circuit side is excluded except for the transmission line. When the phase angle of the reflection coefficient with respect to the predetermined impedance value is close to 0 °, the second adjusting means of the matching circuit excludes the transmission line, and the high frequency electromagnetic field on the most high frequency oscillation circuit side of the matching circuit. The electrodeless discharge lamp lighting device according to claim 10 or 11, wherein a reactance element connected in parallel to the applying means is adjusted to change the phase angle. 18. A transmission line having at least a characteristic impedance equal to the predetermined impedance value is connected to the most high-frequency oscillator circuit side of the matching circuit, and the input impedance of the high-frequency oscillator circuit side excluding the transmission line is measured. When the phase angle of the reflection coefficient with respect to the predetermined impedance value is close to 180 °, the second adjusting means of the matching circuit excludes the transmission line and the high frequency electromagnetic field on the most high frequency oscillation circuit side of the matching circuit. 14. The electrodeless discharge lamp lighting device according to claim 12, wherein the phase angle is changed by adjusting a reactance element connected in series to the applying means.