JP3226331B2 - Electrodeless discharge lamp lighting device - Google Patents

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 in which a driving coil applies a high-frequency electromagnetic field to an electrodeless discharge lamp in which a discharge gas such as an inert gas or mercury vapor is sealed in a light-transmitting bulb. The present invention relates to an electrodeless discharge lamp lighting device for lighting a lamp.

[0002]

2. Description of the Related Art FIG. 6 is a schematic diagram of a conventional electrodeless discharge lamp lighting device. In FIG. 6, the electrodeless discharge lamp 1 has a discharge gas such as a rare gas (inert gas) and mercury vapor sealed therein. The driving coil 2 is wound around the outer periphery of the electrodeless discharge lamp 1 to apply a high-frequency electromagnetic field to the electrodeless discharge lamp 1 to generate plasma in the bulb.

The high-frequency power supply circuit 3 supplies a high-frequency current having a frequency of, for example, 13.56 MHz to the driving coil 2, and is provided with a high-frequency input filter 5 at a DC power supply input terminal. The DC power supply circuit 4 supplies DC power to the high-frequency power supply circuit 3 through the power supply line 12.
A power supply input filter 6 is provided at a power input terminal, including a chopper circuit that performs a switching operation at kHz.

An AC power supply 8 supplies, for example, AC power of a commercial frequency to the DC power supply circuit 4 through a power supply line 11. The metal shield case 7 houses the high frequency power supply circuit 3 including the high frequency input filter 5 and the DC power supply circuit 4 including the power supply input filter 6. In the electrodeless discharge lamp lighting device having the above-described configuration, for example, when AC power is supplied from a commercial frequency AC power supply 8 to the DC power supply circuit 4 through the power supply line 11, the DC power supply circuit 4 converts the AC power into DC power. Converted,
The power is supplied to the high frequency power supply circuit 3 through the power supply line 12. As a result, the high-frequency power supply circuit 3 supplies a high-frequency current to the driving coil 2. As a result, a high-frequency electromagnetic field is generated in the driving coil 2, and the high-frequency electromagnetic field generates a high-frequency plasma current in the electrodeless discharge lamp 1 to generate ultraviolet light or visible light.

The high-frequency input filter 5 provided in the high-frequency power supply circuit 3 prevents the super-high frequency of about 10 MHz generated in the high-frequency power supply circuit 3 from leaking to the DC power supply circuit 4. Power supply input filter 6 provided in DC power supply circuit 4
Prevents the high frequency of 40 to 50 kHz in the DC power supply circuit 4 from leaking to the AC power supply 8 due to the chopper operation, for example.

The metal shield case 7 shields high-frequency noise radiated from the high-frequency power supply circuit 3 and has a box shape and houses the high-frequency power supply circuit 3 and the DC power supply circuit 4. Electrodeless discharge lamp 1 and driving coil 2
And the power supply line 11 from the AC power supply 8 to the DC power supply circuit 4 are exposed to the outside.

[0007]

In the electrodeless discharge lamp lighting device shown in FIG. 6, a high frequency input filter 5 and a power input filter 6 are provided in a high frequency power supply circuit 3 and a DC power supply circuit 4, respectively. Although the configuration is such that leakage is suppressed, even if these high-frequency input filter 5 and power supply input filter 6 are used, the level of high-frequency noise leaking from the metal shield case 7 to the outside is large.

The high-frequency power supply circuit 3 supplies the power supply line 11 and other lines (for example, a control line for transmitting a dimming control signal to a control circuit included in the high-frequency power supply circuit 3) drawn out of the metal shield case 7 to the outside. It is considered that the generated high frequency is guided to the power line 11 and other lines by space conduction, propagates through the power line 11 and other lines, goes out of the metal shield case 7, and is radiated from the power line 11 and other lines. .

Accordingly, it is an object of the present invention to provide an electrodeless discharge lamp lighting device capable of reducing high frequency noise leaking to the outside.

[0010]

According to a first aspect of the present invention, there is provided an electrodeless discharge lamp lighting device comprising a driving coil wound around an outer periphery of an electrodeless discharge lamp in which a discharge gas is sealed in a light-transmitting bulb. High frequency power is supplied to the coil from the high frequency power supply circuit,
Supply DC power from the DC power supply circuit to the high-frequency power supply circuit,
Power is supplied from a power supply to the DC power supply circuit, and the high-frequency power supply circuit and the DC power supply circuit are housed in a metal shield case. In addition, a high-frequency cutoff filter for a power supply line is provided in a power supply line from a power supply outside the metal shield case to the DC power supply circuit in a position near a power supply line outlet of the metal shield case. This high-frequency cutoff filter for power lines is made of metal
Stored in another metal shield case different from the
ing.

According to a second aspect of the present invention, there is provided an electrodeless discharge lamp lighting device.
A driving coil is wound around the outer periphery of an electrodeless discharge lamp in which a discharge gas is sealed in a translucent bulb, high-frequency power is supplied to the driving coil from a high-frequency power supply circuit, and DC power is supplied to the high-frequency power supply circuit from a DC power supply. Only the high-frequency power circuit is supplied and housed in a metal shield case. In addition, a high-frequency cutoff filter for a power supply line is provided in a power supply line from a DC power supply outside the metal shield case to the high-frequency power supply circuit at a position near a power supply line outlet of the metal shield case. This
The source line high-frequency cut filter is a metal shield case.
Housed in a different metal shield case.

According to a third aspect of the invention, there is provided an electrodeless discharge lamp lighting device.
A control circuit for changing power supplied to the driving coil by the high-frequency power supply circuit according to claim 1 or 2, wherein a control line extending from outside the metal shield case to the control circuit is in the vicinity of a control line outlet of the metal shield case. A high-frequency cutoff filter for the control line is provided at the position. According to a fourth aspect of the present invention, a metal shield plate for separating a high-frequency power supply circuit and a DC power supply circuit is provided in the metal shield case of the first aspect.

[0013]

According to the first aspect of the present invention, a high-frequency cutoff filter for a power supply line is provided near a power supply line outlet of the metal shield case on a power supply line extending from a power supply outside the metal shield case to the DC power supply circuit. Therefore, high-frequency noise generated from the high-frequency power supply circuit, propagated by space conduction, and induced in the power supply line is cut off by the high-frequency cutoff filter for the power supply line, and does not propagate further from the high-frequency cutoff filter for the power supply line.
Also, replace the high-frequency cutoff filter for the power line with another metal shield.
The high-frequency cutoff filter for the power line
High-frequency noise from the body can be suppressed to the outside.
And radiated noise from the high-frequency power supply circuit
The line high-frequency cutoff filter is not affected.

According to the second aspect of the present invention, a high-frequency cutoff filter for a power supply line is provided at a position near a power supply line outlet of the metal shield case on a power supply line from a DC power supply outside the metal shield case to the high-frequency power supply circuit. Therefore, high-frequency noise generated from the high-frequency power supply circuit, propagated by space conduction, and guided to the power supply line is cut off by the high-frequency cutoff filter for the power supply line, and does not propagate further from the high-frequency cutoff filter for the power supply line. Also, replace the high-frequency cutoff filter for the power line with another metal.
High-frequency cutoff for power supply line because it is housed in a metal shield case
Suppresses high-frequency noise from the filter itself to the outside
And radiation noise from the high-frequency power supply circuit.
Noise may not be received by the high-frequency cutoff filter for the power line.
No.

According to the third aspect of the present invention, the control line from the outside of the metal shield case to the control circuit is provided with the control line high-frequency cutoff filter near the control line outlet of the metal shield case. High-frequency noise generated from the power supply circuit, propagated by space conduction, and guided to the control line is cut off by the control line high-frequency cutoff filter, and does not propagate from the control line high-frequency cutoff filter.

According to the fourth aspect of the present invention, since the metal shield plate for separating the high-frequency power supply circuit and the DC power supply circuit is provided in the metal shield case, high-frequency noise generated from the high-frequency power supply circuit is reduced in the metal shield case. In the storage area of the high-frequency power supply circuit, and the propagation due to spatial conduction to the storage area of the DC power supply circuit in the metal shield case is suppressed.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] FIG. 1 is a schematic diagram of an electrodeless discharge lamp lighting device according to a first embodiment of the present invention. As shown in FIG. 1, this electrodeless discharge lamp lighting device includes a power supply line 11 extending from an AC power supply 8 outside a metal shield case 7 to a DC power supply circuit 4.
A power line high frequency cutoff filter 9 is provided near the power line outlet of the metal shield case 7 (preferably as close as possible). In this case, the high-frequency cutoff filter 9 for the power supply line is provided outside the metal shield case 7 and is housed in another metal shield case 10 itself. The metal shield case 10 is brought into close contact with the metal shield case 7 so that the length of the power supply line 11 from the DC power supply circuit 4 to the high-frequency cutoff filter 9 for the power supply line is made as short as possible.
1 is not exposed to the outside. In the metal shield case 10, the length of the line on the input side of the power supply line high-frequency cutoff filter 9 is made as short as possible. Is prevented from propagating.

The configuration other than the above is the same as that of the conventional example shown in FIG. With the above configuration, the high-frequency power supply circuit high-frequency cutoff filter 3 power supply line to cut off the high frequency noise in the power supply line for high-frequency cutoff filter 9 induced to the power supply line 11 propagates Ri by the space conduction occurs from Thus, it is possible to prevent the high frequency noise from leaking to the outside of the metal shield case 7 through the power supply line 11.

Here, the pattern of propagation of high frequency noise generated from the high frequency power supply circuit 3 will be described. Propagation of high-frequency noise is generally considered to be of two types: space conduction and conductor conduction. In the electrodeless discharge lamp lighting device, the propagation of the conductor conduction of the high frequency noise generated by the high frequency power supply circuit 3 generating the high frequency to the DC power supply circuit 4 can be prevented by the high frequency input filter 5. However, spatial conduction of high-frequency noise generated by the high-frequency power supply circuit 3 cannot be prevented by the high-frequency input filter 5. High-frequency noise is guided to the power supply line 11 by the propagation due to the space conduction, and leaks from the power supply line 11 to the outside of the metal shield case 7. The high-frequency cutoff filter 9 for the power line prevents the high-frequency noise from propagating to the power line 11 by spatial conduction and further from the power line 11 to the outside of the metal shield case 7. Is provided with a high-frequency cutoff filter 9 for a power supply line, so that high-frequency noise generated by the high-frequency power supply
It will suppress leakage to the outside.

In the above embodiment, in order to prevent spatial transmission of high frequency noise to the high frequency cutoff filter 9 for the power supply line, the metal shield case 10 surrounding the high frequency cutoff filter 9 for the power supply line is used.
Is provided, the radiation of high-frequency noise from the power supply line high-frequency cutoff filter 9 itself to the outside can be suppressed, and the noise reduction effect of the power supply line high-frequency cutoff filter 9 is further increased.

In the above-described embodiment, the high-frequency cutoff filter 9 for the power supply line is provided outside the metal shield case 7, but the high-frequency cutoff filter 9 for the power supply line may be provided inside the metal shield case 7. When the high-frequency cutoff filter 9 for the power supply line is provided inside the metal shield case 7 in this manner, the line on the input side of the high-frequency cutoff filter 9 for the power supply line, that is, the line extending to the outside of the metal shield case 7 has a space conduction. When the high-frequency noise propagates, the presence of the power supply line high-frequency cutoff filter 9 becomes meaningless, so that the length of the power supply line 11 on the input side of the power supply line high-frequency cutoff filter 9 inside the metal shield case 7 is sufficient. It is necessary to shorten it. As described above, even when the power supply line high-frequency cutoff filter 9 is provided inside the metal shield case 7, if the power supply line high-frequency cutoff filter 9 is surrounded by another metal shield case, the power supply line high-frequency cutoff filter 9 can be used. The radiation of high-frequency noise from itself to the outside can be suppressed, and the noise reduction effect of the high-frequency cutoff filter 9 for the power supply line is further increased.

[Second Embodiment] FIG. 2 is a schematic diagram of an electrodeless discharge lamp lighting device according to a second embodiment of the present invention. In this electrodeless discharge lamp lighting device, as shown in FIG. 2, a metal shield plate 15 for separating a high-frequency power circuit housing area 13 and a DC power circuit housing area 14 is provided in a metal shield case 7.

In the housing area 14 of the DC power supply circuit 4, the power supply line 12 from the DC power supply circuit 4 to the high-frequency power supply circuit 3 is connected to the power supply line high-frequency cutoff filter 9 at a position near the power supply line outlet of the metal shield plate 15. Is provided. Further, another metal shield plate 16 is provided in the storage area 14 of the DC power supply circuit 4 to separate the power supply line high frequency cutoff filter storage area 17 from both the DC power supply circuit storage area 14 and the high frequency power supply circuit storage area 13. I am trying to do it.

The other structure is the same as that of the conventional example shown in FIG. In this electrodeless discharge lamp lighting device, since the metal shield plate 15 for separating the high-frequency power supply circuit storage area 13 and the DC power supply circuit storage area 14 is provided in the metal shield case 7, high-frequency noise generated from the high-frequency power supply circuit 3 is provided. Can be confined in the high-frequency power supply circuit storage area 13 in the metal shield case 7, and high-frequency noise can be suppressed from entering the DC power supply circuit storage area 14.

The DC power supply circuit 4 and the high-frequency power supply circuit 3
Since the high-frequency cutoff filter 9 for the power line is provided in the power line 12 between the power supply line 12 and the power supply line 12, the high-frequency noise generated from the high-frequency power supply circuit 3 propagates to the power supply line 12 by spatial conduction and leaks into the storage space 14 of the DC power supply circuit 4. Can be suppressed.
Therefore, through the power supply line 11, the metal shield case 7
Can be suppressed from leaking to the outside.

Further, since the power supply line high-frequency cutoff filter 9 is surrounded by the metal shield plates 15 and 16 and the metal shield case 7, radiation of high-frequency noise from the power supply line high-frequency cutoff filter 9 to the outside is suppressed. Can be
The noise reduction effect of the high-frequency cutoff filter 9 for the power supply line is further increased. Third Embodiment FIG. 3 is a schematic diagram showing an electrodeless discharge lamp lighting device according to a third embodiment of the present invention. This electrodeless discharge lamp lighting device omits the DC power supply circuit 4 in FIG. 1, stores only the high-frequency power supply circuit 3 and the high-frequency input filter 5 in the metal shield case 7, and directly supplies the high-frequency power supply from a DC power supply 18 such as a battery. An electrodeless discharge lamp lighting device for supplying DC power to a circuit 3 is provided with a high-frequency cutoff filter 9 for a power line and a metal shield case 10 as in FIG. Other configurations, such as how to install 10, are the same as those in FIG.

In this embodiment, the same effects as in the embodiment of FIG. 1 can be obtained. [Fourth Embodiment] An example of a specific structure of the electrodeless discharge lamp lighting device described above is shown as a fourth embodiment in FIG.
Shown in In FIG. 4, reference numeral 21 denotes an electrodeless discharge lamp;
Is a drive coil, 23 is a metal outer case (corresponding to the metal shield case 7 in FIG. 1), and the high-frequency power supply circuit 3, high-frequency input filter 5, DC power supply circuit 4, and power supply input filter in FIG. 6, a high-frequency cutoff filter 24 for power supply lines, a high-frequency cutoff filter 25 for control lines, and the like are housed.

Reference numeral 26 denotes a shield case formed of a metal wire or the like in a mesh shape to prevent radiation noise emitted from the electrodeless discharge lamp 21. The shape of the mesh is determined by the effect of preventing noise and the rate of decrease in light output by the mesh.
Reference numeral 27 denotes a metal shield plate, which is a high-frequency power supply circuit storage area 34.
And the DC power supply circuit storage area 35 are separated. Reference numeral 28 denotes a printed wiring board on which various components constituting a high-frequency power supply circuit including a dimming control circuit are mounted, and reference numeral 29 denotes a printed wiring board on which various components constituting a DC power supply circuit are mounted. 30, 31
Is a spacer for keeping the interval between the two printed wiring boards 28 and 29. 32 is a power supply line from an external AC power supply to a DC power supply circuit, 33 is a control line to a dimming control circuit,
Both are inserted into the outer shell case 23 through the through holes 23a and 23b of the outer shell case 23. The high-frequency cutoff filter 24 for the power supply line and the high-frequency cutoff filter 25 for the control line are composed of a filter coil, a filter capacitor, and the like.

In the configuration shown in FIG. 4, if the high-frequency cutoff filter 24 for the power supply line and the high-frequency cutoff filter 25 for the control line are not provided, as described above, the conductor between the high-frequency power supply circuit and the DC power supply circuit is provided. Noise due to conduction can be prevented by the high-frequency input filter 5 and the power supply input filter 6 in FIG. 1 and the like, but propagated from the high-frequency power supply circuit to the power supply line 32 and the control line 33 in the outer case 23 by spatial conduction. The generated noise leaks from the outer case 23 to the outside through the power supply line 32 and the control line 33, and the radiation noise from the power supply line 32 and the control line 33 outside the outer case 23 increases. However, in this embodiment, the high-frequency cutoff filter 24 for the power supply line and the high-frequency cutoff filter 25 for the control line
Since it is installed in the vicinity of 3a, 23b, it is possible to reduce the radiation noise as described above.

In the embodiment shown in FIG. 4, the high-frequency cutoff filter 24 for the power supply line and the high-frequency cutoff filter 2 for the control line are used.
5 is provided inside the outer shell case 23, but on the outside,
Of course, it may be installed near the through holes 23a and 23b. The power supply line high-frequency cutoff filter 24 and the control line high-frequency cutoff filter 25 may have a configuration in which a filter coil, a filter capacitor, and the like are mounted on a circuit board and attached to the outer shell case 23. The configuration in which the filter component is covered with a metal shield case is more effective in preventing noise.

Further, in the embodiment shown in FIG.
The power supply line 32 and the control line 3
3 are provided with a high-frequency cutoff filter 24 for the power supply line and a high-frequency cutoff filter 25 for the control line, but some of them do not have the control line 33. In this case, the high-frequency cutoff filter 25 for the control line is omitted. It is natural. When both the power supply line 32 and the control line 33 are provided, only one of them may be provided with a high-frequency cutoff filter. In FIG. 4, the metal shield plate 27 is provided, but this may be omitted.

Here, FIG. 5 shows an example of a specific configuration of the high-frequency power supply circuit 3 and the high-frequency input filter 5 shown in FIG. 1, and the configuration will be described. The oscillation circuit 3-6
This is a circuit using a crystal oscillator X, and a low-Q tuning circuit is constituted by a coil L ₆ and a capacitor C ₁₅ , which is an unadjusted oscillator. R ₄ to R ₇ are resistors, C ₇ ,
C ₈ and C ₁₄ are capacitors, respectively.

The preamplifier for amplifying the oscillation output of the oscillator 3-6 (intermediate amplifier) 3-5 is performing class C amplification by the transistor Q _4. Coil L ₅ , capacitor C ₁₇
To tune to the oscillation frequency. Resistance R ₈
Circuit consisting to R ₁₀ constitute an attenuator, the resistance R ₁₁
It has put in order to reduce the Q of the coil L _5. R ₃ is a resistor, and C ₆ and C ₁₆ are capacitors.

The high frequency input filter 5 is composed of a coil L ₃ , a capacitor C _{4 and the} like, and prevents high frequency from returning to the power supply. A main amplifier (power amplification circuit) 3-4 for further amplifying the output of the preamplifier 3-5 at a high frequency
Power MOSFET (hereinafter referred to as transistor) Q ₅
Amplifier. Coil L ₇ is Yes put to counteract the input capacitance of the transistor Q _5, the resistance R ₁₂ of which is incorporated in order to match the input impedance of the transistor Q ₅ and the output of the preamplifier 3-5. C ₅ is a capacitor, L ₄ is a coil.

The matching circuit (impedance matching circuit) 3-3 is formed by a capacitor C ₁₈ -C ₂₀ or the like, subjected to impedance matching between the electrodeless discharge lamp 1 and the driving coil 2 and the output of the rear stage of the main amplifier 4 Is what it is. _Cver is a variable capacitor. The electrodeless discharge lamp 1 has a rare gas, mercury vapor or the like sealed therein, and a driving coil 2, which is an air-core coil having several turns, is arranged close to the outer periphery of the electrodeless discharge lamp 1.
The driving coil 2 supplies high frequency power input from the matching circuit 3-3 to the luminescent gas of the electrodeless discharge lamp 1.

Note that the circuit configuration of the DC power supply circuit 4 and the power supply input filter 6 is a circuit configuration including a chopper circuit and the like, and since the configurations are well known, illustration of the circuit configuration is omitted. The filters such as the power supply line high-frequency cutoff filter 9 and the like are not shown in the circuit configuration, but can be realized with the same circuit configuration as the configuration of the high-frequency input filter 5 in FIG. 5, for example.

[0037]

According to the electrodeless discharge lamp lighting device of the first aspect, the power supply line extending from the power supply outside the metal shield case to the DC power supply circuit is connected to the power supply line at a position near the power supply line outlet of the metal shield case. High-frequency cutoff filter is provided, so that high-frequency noise generated from the high-frequency power supply circuit, propagated by space conduction, and induced in the power supply line is cut off by the power supply line high-frequency cutoff filter, To the outside of the metal shield case through the power supply line, thereby reducing generation of radiated noise. Ma
Also, replace the high-frequency cutoff filter for the power line with another metal shield cable.
High-frequency cutoff filter for power line
High frequency noise from the outside can be suppressed.
And radiation noise from the high-frequency power supply circuit
The high-frequency cutoff filter is not affected.

According to the electrodeless discharge lamp lighting device of the second aspect, the power supply line extending from the DC power supply outside the metal shield case to the high frequency power supply circuit is connected to the power supply line at a position near the power supply line outlet of the metal shield case. Since the high-frequency cutoff filter is provided, the high-frequency noise generated from the high-frequency power supply circuit, propagated by space conduction, and induced in the power supply line is cut off by the high-frequency cutoff filter for the power supply line, and the high-frequency cutoff filter for the power supply line is first. Propagation can be prevented, and generation of radiation noise due to leakage of high-frequency noise through the power supply line to the outside of the metal shield case can be reduced. Also, replace the high-frequency cutoff filter for the power line with another metal sheath.
High-frequency cutoff filter for power line
To suppress the radiation of high frequency noise from the
And radiated noise from the high-frequency power supply circuit.
The high-frequency cutoff filter for the power line is not affected.

According to the electrodeless discharge lamp lighting device of the third aspect, the control line from the outside of the metal shield case to the control circuit is provided with the high-frequency cutoff filter for the control line near the control line outlet of the metal shield case. Since it is provided, high-frequency noise generated from the high-frequency power supply circuit and propagated by space conduction and guided to the control line is cut off by the high-frequency cutoff filter for the control line so that it does not propagate from the high-frequency cutoff filter for the control line. Therefore, it is possible to reduce generation of radiation noise due to leakage of high-frequency noise to the outside of the metal shield case through the control line.

According to the electrodeless discharge lamp lighting device of the fourth aspect, since the metal shield plate for separating the high-frequency power supply circuit and the DC power supply circuit is provided in the metal shield case, high-frequency noise generated from the high-frequency power supply circuit is provided. Is confined in the storage area of the high-frequency power supply circuit in the metal shield case, and propagation due to spatial conduction to the storage area of the DC power supply circuit in the metal shield case can be suppressed. As a result, high-frequency noise generated from the high-frequency power supply circuit can be less likely to be guided to the power supply line of the DC power supply circuit, and leakage of the high-frequency noise to the outside of the metal shield case through the power supply line can be further reduced.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of an electrodeless discharge lamp lighting device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a configuration of an electrodeless discharge lamp lighting device according to a second embodiment of the present invention.

FIG. 3 is a schematic diagram showing a configuration of an electrodeless discharge lamp lighting device according to a third embodiment of the present invention.

FIG. 4 is a schematic diagram showing a configuration of an electrodeless discharge lamp lighting device according to a fourth embodiment of the present invention.

FIG. 5 is a circuit diagram showing a specific circuit configuration of a high-frequency power supply circuit and a high-frequency input filter.

FIG. 6 is a schematic view showing a conventional example of an electrodeless discharge lamp lighting device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 electrodeless discharge lamp 2 drive coil 3 high frequency power supply circuit 4 DC power supply circuit 5 high frequency input filter 6 power supply input filter 7 metal shield case 8 AC power supply 9 power supply line high frequency cutoff filter 10 metal shield case 11 power supply line 12 power supply Wire 13 High-frequency power circuit storage area 14 DC power circuit storage area 15 Metal shield plate 16 Metal shield plate 17 High-frequency cutoff filter storage area for power line 18 DC power supply 21 Electrodeless discharge lamp 22 Driving coil 23 Outer case 24 Power supply line High frequency cutoff filter 25 High frequency cutoff filter for control line 26 Shield case 27 Metal shield plate 32 Power line 33 Control line 34 High frequency power supply circuit storage area 35 DC power supply circuit storage area

──────────────────────────────────────────────────の Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H05B 41/24-41/29 H01J 65/04

Claims (4)

(57) [Claims] 1. An electrodeless discharge lamp in which a discharge gas is sealed in a translucent bulb, a driving coil wound around the outer periphery of the electrodeless discharge lamp, and a high frequency power supply to the driving coil. A high-frequency power supply circuit, a DC power supply circuit for supplying DC power to the high-frequency power supply circuit, a power supply for supplying power to the DC power supply circuit, and a metal shield case containing the high-frequency power supply circuit and the DC power supply circuit, A high-frequency cutoff filter for a power supply line is provided at a position near a power supply line outlet of the metal shield case on a power supply line from the power supply outside the metal shield case to the DC power supply circuit, and the high-frequency cutoff filter for the power supply line is provided . Metal sea
The electrodeless discharge lamp lighting device is housed in another metal shield case different from the metal case . 2. An electrodeless discharge lamp in which a discharge gas is sealed in a translucent bulb, a driving coil wound around the outer periphery of the electrodeless discharge lamp, and a high-frequency power supply to the driving coil. A high-frequency power supply circuit, a direct-current power supply for supplying direct-current power to the high-frequency power supply circuit, and a metal shield case housing only the high-frequency power supply circuit, from the direct-current power supply outside the metal shield case to the high-frequency power supply circuit A high-frequency cutoff filter for a power supply line is provided at a position near the power supply line outlet of the metal shield case on the power supply line that extends, and the high-frequency cutoff filter for the power supply line is sealed with the metal seal.
An electrodeless discharge lamp lighting device characterized by being housed in a metal shield case different from a metal case . 3. A control line for changing power supplied to the driving coil by a high-frequency power supply circuit, and a control line extending from the outside of the metal shield case to the control circuit in the vicinity of a control line outlet of the metal shield case. 3. The electrodeless discharge lamp lighting device according to claim 1, wherein a high-frequency cutoff filter for a control line is provided at a position. 4. The electrodeless discharge lamp lighting device according to claim 1, wherein a metal shield plate for separating a high-frequency power supply circuit and a DC power supply circuit is provided in the metal shield case.