JPH065375A - Lighting device for electrodeless discharge lamp - Google Patents

Abstract

PURPOSE:To reduce high frequency noises leaking to the outside. CONSTITUTION:A drive coil 2 is wound on an electrodeless discharge lamp 1 wherein a discharging gas is encapsulated in a light transmissive bulb, and a high frequency power is supplied to this coil 2 from a high frequency power supply circuit 3, to which a DC power is supplied from a DC power supply circuit 4. Power is supplied to this circuit 4 from the AC mains, and the circuits 3, 4 are accommodated in a metal shield case 7. In a position on this shield case 7 near a power line takeout hole, a high frequency cutoff filter 9 is installed on the power line 12 leading from the AC mains 8 outside of the shield case 7 to the DC power supply circuit 4. The filter 9 cuts off high frequency noises which are generated in the high frequency power supply circuit 3, conducted through space condition, and led to the power line 11. Thus eventually included noises do not proceed farther than this cutoff filter 9.

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 drive coil is used to apply a high-frequency electromagnetic field to an electrodeless discharge lamp having a transparent bulb filled with a discharge gas such as an inert gas or mercury vapor. 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 view of a conventional electrodeless discharge lamp lighting device. In FIG. 6, the electrodeless discharge lamp 1 is filled with a discharge gas such as a rare gas (inert gas) or mercury vapor. The driving coil 2 is wound around the outer circumference 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 of, for example, a frequency of 13.56 MHz to the driving coil 2, and has a high frequency input filter 5 at the input end of the DC power supply. The direct-current power supply circuit 4 supplies direct-current power to the high-frequency power supply circuit 3 through the power supply line 12, for example, 40 to 50.
A power supply input filter 6 is provided at a power supply input terminal including a chopper circuit that performs a switching operation of kHz.

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

Further, the high frequency input filter 5 provided in the high frequency power supply circuit 3 prevents an ultra high frequency of more than 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 the DC power supply circuit 4
Prevents leakage of a high frequency of 40 to 50 kHz in the DC power supply circuit 4 to the AC power supply 8 due to, for example, a chopper operation.

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 drive coil 2
And the power supply line 11 from the AC power supply 8 to the DC power supply circuit 4 is exposed to the outside.

[0007]

In the electrodeless discharge lamp lighting device of FIG. 6, the high frequency power supply circuit 3 and the direct current power supply circuit 4 are provided with a high frequency input filter 5 and a power supply input filter 6, respectively. Although it is configured to suppress leakage, even if these high frequency input filter 5 and power source input filter 6 are used, the high frequency noise level leaking from the metal shield case 7 to the outside is large.

From the high frequency power supply circuit 3 to the power supply line 11 and other lines (for example, a control line for sending a dimming control signal to the control circuit included in the high frequency power supply circuit 3) drawn out from the metal shield case 7 to the outside. It is considered that the generated high frequency is induced in the power line 11 and other lines by space conduction, propagates in 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. .

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

[0010]

According to another aspect of the present invention, there is provided an electrodeless discharge lamp lighting device in which a driving coil is wound around an outer circumference of an electrodeless discharge lamp in which a transmissive bulb is filled with a discharge gas. High frequency power is supplied to the coil from the high frequency power 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. Further, a high-frequency cutoff filter for a power supply line is provided in the power supply line from the power supply outside the metal shield case to the DC power supply circuit in the vicinity of the power supply line outlet of the metal shield case.

The electrodeless discharge lamp lighting device according to claim 2 is
A drive coil is wound around the outer circumference of an electrodeless discharge lamp in which a discharge gas is sealed in a translucent bulb, and high frequency power is supplied from the high frequency power supply circuit to the drive coil, and direct current power is supplied from the DC power supply to the high frequency power supply circuit. The high-frequency power supply circuit is supplied and stored in a metal shield case. Further, a high-frequency cutoff filter for the power supply line is provided in the power supply line from the DC power supply outside the metal shield case to the high-frequency power supply circuit in the vicinity of the power supply line outlet of the metal shield case.

The electrodeless discharge lamp lighting device according to claim 3 is
The control line from the outside of the metal shield case to the control circuit includes a control circuit for changing the power supplied to the driving coil, and the high frequency power supply circuit according to claim 1 or 2 is near the control line outlet of the metal shield case. A high frequency cutoff filter for the control line is provided at the position. In the electrodeless discharge lamp lighting device according to the fourth aspect, the metal shield plate that separates the high frequency power supply circuit and the direct current power supply circuit is provided in the metal shield case according to the first aspect.

[0013]

According to the structure of the present invention, a high-frequency cutoff filter for a power line is provided on a power line from a power source outside the metal shield case to a DC power circuit in the vicinity of the power line outlet of the metal shield case. Therefore, the high-frequency noise generated from the high-frequency power supply circuit, propagated by space conduction, and induced in the power supply line is blocked by the power supply line high-frequency cutoff filter, and does not propagate forward from the power supply line high-frequency cutoff filter.

According to the second aspect of the invention, the high frequency cutoff filter for the power line is provided in the power line from the DC power source outside the metal shield case to the high frequency power circuit in the vicinity of the power line outlet of the metal shield case. Therefore, the high-frequency noise generated from the high-frequency power supply circuit, propagated by space conduction, and induced in the power supply line is blocked by the power supply line high-frequency cutoff filter, and does not propagate forward from the power supply line high-frequency cutoff filter.

According to the third aspect of the invention, since 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 in the vicinity of the control line outlet of the metal shield case, the high-frequency control filter is provided. The high frequency noise generated from the power supply circuit and propagated by space conduction and induced in the control line is blocked by the control line high frequency cutoff filter and does not propagate forward from the control line high frequency cutoff filter.

According to the fourth aspect of the invention, since the metal shield plate for separating the high frequency power supply circuit and the direct current power supply circuit is provided in the metal shield case, the high frequency noise generated from the high frequency power supply circuit is in the metal shield case. Is confined in the storage area of the high frequency power supply circuit, and propagation due to space 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 view 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 the metal shield case 7 to a DC power supply circuit 4.
In addition, the high frequency cutoff filter 9 for the power line is provided at a position near the power line outlet of the metal shield case 7 (a position as close as possible is desirable). In this case, the power line high-frequency cutoff filter 9 is provided outside the metal shield case 7, and is itself housed in another metal shield case 10. 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 as short as possible, and the power supply line 1 at that portion is
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 line high-frequency cutoff filter 9 is made as short as possible, and the space conduction to the line on the input side of the power line high-frequency cutoff filter 9 is performed in the metal shield case 10. The high frequency noise is prevented from propagating.

The structure other than the above is the same as that of the conventional example shown in FIG. With the above-described configuration, the high frequency noise generated by the high frequency power supply circuit 3 and propagated by space conduction and induced in the power supply line 11 is blocked by the high frequency power cutoff filter 9 for the power supply line, and then cut off from the high frequency power cutoff filter 9 for the power line. It can be prevented from propagating forward, and high frequency noise can be prevented from leaking to the outside of the metal shield case 7 through the power supply line 11.

The propagation pattern of the high frequency noise generated from the high frequency power supply circuit 3 will be described. There are generally two types of high-frequency noise propagation: space conduction and conductor conduction. In the electrodeless discharge lamp lighting device, the high frequency input filter 5 can prevent propagation of conductor conduction of high frequency noise generated from the high frequency power supply circuit 3 generating high frequency to the DC power supply circuit 4. However, the spatial conduction of the high frequency noise generated from the high frequency power supply circuit 3 cannot be prevented by the high frequency input filter 5. Due to the propagation by the space conduction, high frequency noise is induced in the power supply line 11 and leaks from the power supply line 11 to the outside of the metal shield case 7. As described above, the high frequency cutoff filter 9 for the power line prevents the high frequency noise from propagating to the power line 11 by space conduction and further from the power line 11 to the outside of the metal shield case 7. By providing the high-frequency cutoff filter 9 for the power line on the metal shield case 7, high-frequency noise generated from the high-frequency power circuit 3 is generated.
It will prevent leakage to the outside.

In the above embodiment, the metal shield case 10 surrounding the power line high frequency cut-off filter 9 is provided to prevent high frequency noise from being spatially conducted to the power line high frequency cut-off filter 9.
Since the power supply line high-frequency cutoff filter 9 itself can suppress the radiation of high-frequency noise to the outside, the power supply line high-frequency cutoff filter 9 can further enhance the noise reduction effect.

In the above embodiment, the power line high-frequency cutoff filter 9 is provided outside the metal shield case 7, but the power line high-frequency cutoff filter 9 may be provided inside the metal shield case 7. In this way, when the power line high-frequency cutoff filter 9 is provided inside the metal shield case 7, space conduction is performed on the input side line of the power line high-frequency cutoff filter 9, that is, the line extending to the outside of the metal shield case 7. When the high frequency noise propagates, the existence of the power 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 line high frequency cutoff filter 9 inside the metal shield case 7 is sufficient. It is necessary to shorten it. Even when the power line high-frequency cutoff filter 9 is provided inside the metal shield case 7 as described above, if the power line high-frequency cutoff filter 9 is surrounded by another metal shield case, the power line high-frequency cutoff filter 9 Radiation of high-frequency noise from itself to the outside can be suppressed, and the noise reduction effect of the power line high-frequency cutoff filter 9 is further enhanced.

[Second Embodiment] FIG. 2 shows a schematic view 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 is provided in the metal shield case 7 for separating the high frequency power circuit storage area 13 and the DC power circuit storage area 14.

In the storage 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 provided with a high frequency cutoff filter 9 for the power supply line at a position near the power supply line outlet of the metal shield plate 15. Is provided. Further, in the storage area 14 of the DC power supply circuit 4, another metal shield plate 16 is provided to separate the power line high-frequency cutoff filter storage area 17 from both the DC power supply circuit storage area 14 and the high-frequency power 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, the metal shield plate 15 is provided in the metal shield case 7 for separating the high frequency power supply circuit storage area 13 and the DC power supply circuit storage area 14, so that high frequency noise generated from the high frequency power supply circuit 3 is generated. Can be confined in the high frequency power circuit storage area 13 in the metal shield case 7, and high frequency noise can be suppressed from entering the DC power circuit storage area 14.

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

Further, since the power line high-frequency cutoff filter 9 is surrounded by the metal shield plates 15 and 16 and the metal shield case 7, the radiation of high-frequency noise from the power line high-frequency cutoff filter 9 itself is suppressed. You can
The noise reduction effect of the power line high-frequency cutoff filter 9 is further enhanced. [Third Embodiment] FIG. 3 is a schematic view of an electrodeless discharge lamp lighting device according to a third embodiment of the present invention. In this electrodeless discharge lamp lighting device, the DC power supply circuit 4 in FIG. 1 is omitted, only the high frequency power supply circuit 3 and the high frequency input filter 5 are housed in the metal shield case 7, and the DC power supply 18 such as a battery is directly connected to the high frequency power supply. An electrodeless discharge lamp lighting device for supplying DC power to the circuit 3 is provided with a high-frequency cutoff filter 9 for power lines and a metal shield case 10 as in FIG. Other configurations such as the installation method of 10 are the same as those in FIG.

Also in this embodiment, the same effect as that of the embodiment of FIG. 1 can be obtained. [Fourth Embodiment] Here, an example of a specific structure of the electrodeless discharge lamp lighting device described above will be described as a fourth embodiment with reference to FIG.
Shown in. In FIG. 4, 21 is an electrodeless discharge lamp, 22
1 is a drive coil, and 23 is a metal outer shell case (corresponding to the metal shield case 7 in FIG. 1). The high frequency power supply circuit 3, the high frequency input filter 5, the DC power supply circuit 4, the power supply input filter in FIG. The circuit elements constituting the circuit 6, the power line high-frequency cutoff filter 24, the control line high-frequency cutoff filter 25, and the like are housed.

Reference numeral 26 is 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 noise prevention and the reduction rate of light output by the mesh.
Reference numeral 27 is a metal shield plate, which is a high frequency power circuit storage area 34.
And the DC power circuit storage area 35 are separated. Reference numeral 28 is a printed wiring board on which various components forming a high frequency power supply circuit including a dimming control circuit are mounted, and 29 is a printed wiring board on which various components forming a DC power supply circuit are mounted. 30, 31
Is a spacer for keeping the distance 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 power line high-frequency cutoff filter 24 and the control line high-frequency cutoff filter 25 are composed of a filter coil, a filter capacitor, etc., and are installed inside the outer shell case 23 near the through holes 23a and 23b, respectively.

In the structure as shown in FIG. 4, if the power line high-frequency cutoff filter 24 and the control line high-frequency cutoff filter 25 are not provided, the conductor between the high-frequency power supply circuit and the direct-current power supply circuit as described above. Although noise due to conduction can be prevented by the high frequency input filter 5 and the power input filter 6 in FIG. 1 and the like, it is propagated from the high frequency power circuit to the power line 32 and the control line 33 in the outer shell case 23 by spatial conduction. The generated noise leaks from the outer shell 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 shell 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 are respectively provided in the through holes 2
Since it is installed in the vicinity of 3a and 23b, the above-mentioned radiation noise can be reduced.

In the embodiment of FIG. 4, the power line high frequency cutoff filter 24 and the control line high frequency cutoff filter 2 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 line high-frequency cutoff filter 24 and the control line high-frequency cutoff filter 25 may be configured such that a filter coil and a filter capacitor are mounted on a circuit board and attached to the outer shell case 23, but the filter coil and the filter capacitor are also included. It is more effective in terms of noise prevention to cover the filter component of (3) with a metal shield case.

Further, in the embodiment of FIG. 4, the outer shell case 23
The power line 32 and the control line 3 are drawn out from the
3 and the high frequency cut-off filter 24 for the power supply line and the high frequency cut-off filter 25 for the control line are provided on both of them, but there is one without the control line 33. In this case, the high-frequency cut-off filter 25 for the control line is omitted. It is natural. Further, 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. Further, although the metal shield plate 27 is provided in FIG. 4, this may be omitted.

Here, an example of a specific configuration of the high frequency power supply circuit 3 and the high frequency input filter 5 of FIG. 1 is shown in FIG. 5, and the configuration will be described. The oscillator circuit 3-6 is
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 to} provide an unadjusted oscillator. R ₄ to R ₇ are resistors, C ₇ ,
C ₈ and C ₁₄ are capacitors respectively.

A preamplifier (intermediate amplifier circuit) 3-5 that amplifies the oscillation output of the oscillator 3-6 performs class C amplification with a transistor Q ₄ . Coil L ₅ , capacitor C ₁₇
To tune to the oscillation frequency. Resistance R ₈
The circuit composed of R ₁₀ to R ₁₀ constitutes an attenuator, and the resistor R ₁₁
Is inserted to lower 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, etc., and prevents the high frequency from returning to the power supply. The main amplifier (power amplifier circuit) 3-4 that further amplifies the output of the preamplifier 3-5 at a higher frequency,
Power MOSFET (hereinafter referred to as transistor) Q ₅
It is an amplifier by. Coil L ₇ is included to cancel the input capacitance of transistor Q ₅ , and resistor R ₁₂ is included to match the input impedance of transistor Q ₅ with the output of preamplifier 3-5. C ₅ is a capacitor and L ₄ is a coil.

The matching circuit (impedance matching circuit) 3-3 is composed of capacitors C _{18 to} C _20, etc., and performs impedance matching between the output of the main amplifier 4 and the electrodeless discharge lamp 1 and the driving coil 2 in the subsequent stage. It is what C _ver is a variable capacitor. The electrodeless discharge lamp 1 is one in which a rare gas, mercury vapor and the like are enclosed, and a driving coil 2 which is an air-core coil for several turns is arranged close to the outer periphery of the electrodeless discharge lamp 1.
The driving coil 2 supplies the high-frequency power input from the matching circuit 3-3 to the luminescent gas of the electrodeless discharge lamp 1.

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, the circuit configuration is not shown. Further, although the circuit configuration of the filters such as the power line high-frequency cutoff filter 9 is omitted, it can be realized by a circuit configuration similar to that of the high-frequency input filter 5 of FIG. 5, for example.

[0037]

According to the electrodeless discharge lamp lighting device of the first aspect of the present invention, the power supply line extending from the power supply outside the metal shield case to the DC power supply circuit is located near the power supply line outlet of the metal shield case. Since a high-frequency cutoff filter for the power supply is provided, the high-frequency cutoff filter for the power supply line cuts off the high-frequency noise generated from the high-frequency power supply circuit, propagated by space conduction, and induced in the power supply line. It is possible to prevent the high frequency noise from leaking to the outside of the metal shield case through the power supply line to reduce the generation of radiation noise.

According to the electrodeless discharge lamp lighting device of the second aspect, the power line for the power line is provided near the power line outlet of the metal shield case to the power line from the DC power source outside the metal shield case to the high frequency power circuit. Since the high frequency cutoff filter is provided, the high frequency cutoff filter for the power supply line cuts off the high frequency noise generated from the high frequency power supply circuit and propagated by space conduction and induced in the power supply line. It can be prevented from propagating, and high-frequency noise can be prevented from leaking to the outside of the metal shield case through the power supply line to generate radiation noise.

According to the electrodeless discharge lamp lighting device of the third aspect, the control line high-frequency cutoff filter is provided on the control line from the outside of the metal shield case to the control circuit at a position near the control line outlet of the metal shield case. Since it is provided, the high frequency noise generated from the high frequency power supply circuit and propagated by space conduction and induced in the control line is blocked 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. It is possible to reduce the occurrence of high-frequency noise leaking to the outside of the metal shield case through the control line and generating radiation noise.

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 direct current power supply circuit is provided in the metal shield case, the high frequency noise generated from the high frequency power supply circuit. Can be confined in the storage area of the high-frequency power supply circuit in the metal shield case, and propagation due to space 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 made less likely to be induced in the power supply line of the DC power supply circuit, and high frequency noise can be further reduced from leaking to the outside of the metal shield case through the power supply line.

[Brief description of 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]

 1 Electrode Discharge Lamp 2 Driving 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 High Frequency Cutoff Filter for Power Supply Line 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 Power line high-frequency cutoff filter storage area 18 DC power supply 21 Electrode discharge lamp 22 Drive coil 23 Outer shell 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 supply line 33 Control line 34 High frequency power supply circuit storage area 35 DC power supply circuit storage area

Claims (4)

[Claims] 1. An electrodeless discharge lamp in which a transmissive bulb is filled with a discharge gas, a drive coil wound around the outer circumference of the electrodeless discharge lamp, and high-frequency power is supplied to the drive coil. A high-frequency power supply circuit, a direct-current power supply circuit that supplies direct-current power to the high-frequency power supply circuit, a power supply that supplies power to the direct-current power supply circuit, and a metal shield case housing the high-frequency power supply circuit and the direct-current power supply circuit, An electrodeless discharge lamp characterized in that a high-frequency cutoff filter for a power supply line is provided on a power supply line from the power supply outside the metal shield case to the DC power supply circuit in the vicinity of a power supply line outlet of the metal shield case. Lighting device. 2. An electrodeless discharge lamp in which a discharge gas is filled with a discharge gas, a driving coil wound around the outer circumference of the electrodeless discharge lamp, and high-frequency power is supplied 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 accommodating only the high-frequency power supply circuit, and from the DC power supply outside the metal shield case to the high-frequency power supply circuit. An electrodeless discharge lamp lighting device, characterized in that 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 extending therethrough. 3. A high frequency power supply circuit includes a control circuit for changing the electric power supplied to the drive coil, and a control line extending from the outside of the metal shield case to the control circuit is near a control line outlet of the metal shield case. The electrodeless discharge lamp lighting device according to claim 1 or 2, 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 the high frequency power supply circuit and the direct current power supply circuit is provided in the metal shield case.