JP3613022B2 - Electrodeless discharge lamp device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrodeless discharge lamp device that does not have a main electrode in a glass bulb and emits light using a high-frequency electromagnetic field generated by supplying high-frequency power from a high-frequency power supply circuit to an induction coil. .
[0002]
[Prior art]
Conventionally, in this type of electrodeless discharge lamp apparatus, the structure in which the induction coil 2 is inside the glass bulb 1 is described in, for example, Japanese Patent Application No. 9-106332 filed earlier by the applicant of the present application. There is such a structure as shown in FIG. A high frequency current flows from the high frequency power supply circuit 8 through the cable 7 to the matching circuit 6 in the base portion 5. A circuit that matches the induction coil 2 (consisting of the coil portion 2a and the lead portion 2b) and the electrodeless discharge lamp L at the time of lighting is set on the matching circuit 6. When a high frequency current flows from the matching circuit 6 to the induction coil 2, a high frequency electromagnetic field is generated from the induction coil 2, and discharge plasma 4 is formed in the glass bulb 1. Then, the low-pressure mercury as the discharge plasma 4 emits ultraviolet light, and the ultraviolet light is converted into visible light by the phosphor 9, and the electrodeless discharge lamp L is turned on.
[0003]
Here, in this electrodeless discharge lamp apparatus, in the electrodeless discharge lamp L, a high-frequency current flows through the induction coil 2, and noise is generated from the coil portion 2a and the lead portion 2b of the induction coil 2. An induction coil 2 is installed in a recess k, the induction coil 2 is inside the glass bulb 1, has good thermal conductivity, and has the same potential as that of the ground side of the high-frequency power supply circuit 8. A metal cylindrical body 3 having an opening on the back side of the recess k is inserted between the glass bulb 1 and the induction coil 2, and noise from the induction coil 2 can be reduced. Furthermore, noise from the lead portion 2b of the induction coil 2 can be reduced by means for bringing the metal cylindrical body 3 and the induction coil 2 into close contact, means for twisting the lead portion 2b of the induction coil 2, or the like.
[0004]
On the other hand, as a conventional example of an electrodeless discharge lamp apparatus having a structure in which the induction coil 2 is outside the glass bulb 1, there is one described in Japanese Patent Laid-Open No. 2-170341. In the present electrodeless discharge lamp apparatus, as shown in FIG. 19, since the wire mesh 30 is installed so as to cover the entire periphery of the glass bulb 1 and the induction coil 2, noise from the induction coil 2 is reduced as a whole. be able to.
[0005]
[Problems to be solved by the invention]
However, in the electrodeless discharge lamp device in which the induction coil 2 is outside the glass bulb 1 as described above, the wire mesh 30 is installed to cover the entire periphery of the glass bulb 1 and the induction coil 2 in order to reduce noise. Then, it leads to the enlargement of an apparatus. Further, in the electrodeless discharge lamp device having this structure, the installation of the metal cylindrical body 3 for noise reduction as shown in the example of FIG. 18 outside the induction coil 2 significantly reduces the luminous flux. There was a problem that I could not.
[0006]
The present invention has been made in view of the above points, and an object of the present invention is an electrodeless discharge lamp device having a structure in which the induction coil is outside the glass bulb, and the induction coil is configured with a simple configuration. An object of the present invention is to provide an electrodeless discharge lamp device capable of reducing generated noise.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, an electrodeless discharge lamp in which a discharge gas such as an inert gas or a metal vapor is sealed in a glass bulb, a coil portion disposed in the vicinity of the electrodeless discharge lamp, and two In an electrodeless discharge lamp apparatus having an induction coil having a lead portion and a high-frequency power supply circuit connected to the induction coil and supplying high-frequency power to the induction coil, ferrite that penetrates through the two lead portions of the induction coil at once A core is provided .
[0008]
According to a second aspect of the present invention, in the first aspect, it is characterized in that so as to constitute by twisting the lead portion before Symbol induction coil.
[0009]
According to a third aspect of the present invention, in the first aspect, around the lead portion of the front Symbol induction coil, a plurality of metal wires forming a conductor formed in a mesh shape or braided, said conductor 2. The electrodeless discharge lamp device according to claim 1, wherein the electrodeless discharge lamp device is configured to have the same potential in terms of high frequency as that of the ground side of the high frequency power supply circuit.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a first reference example of the present invention. The electrodeless discharge lamp device of this reference example is disposed in the glass bulb 1 in the vicinity of the electrodeless discharge lamp L in which a discharge gas such as an inert gas or a metal vapor is sealed, and the outside of the electrodeless discharge lamp L. An induction coil 2 having a coil portion 2a and a lead portion 2b, and a high frequency power supply circuit 8 connected to the induction coil 2 and housed in a base portion 5 for supplying high frequency power to the induction coil 2 are provided. As a noise preventing means for preventing noise from the induction coil 2, the lead portion 2b of the induction coil 2 is twisted.
[0017]
According to this reference example , when the high frequency current flows into the induction coil 2 from the high frequency power supply circuit 8, the electrodeless discharge lamp L is caused to emit light using the high frequency electromagnetic field generated from the induction coil 2. The noise generated outside the glass bulb 1 from the coil portion 2a and the lead portion 2b of the induction coil 2 is reduced by twisting the lead portion 2b. That is, since many loop portions are formed by twisting the lead portion 2b, noise radiated from the lead portion 2b can be reduced. In addition, it is less susceptible to external noise.
[0018]
FIG. 2 is a schematic configuration diagram of the electrodeless discharge lamp apparatus according to the first embodiment of the present invention. In this embodiment, the lead portion 2b of the induction coil 2 is penetrated through the ferrite core 10, Noise prevention means for preventing noise is provided.
[0019]
According to the present embodiment, the noise radiated from the lead portion 2b can be reduced with a simple configuration by passing the lead portion 2b of the induction coil 2 through the ferrite core 10.
[0020]
FIG. 3 is a schematic configuration diagram of an electrodeless discharge lamp device according to a second reference example of the present invention. In this reference example , the periphery of the lead portion 2b of the induction coil 2 is made of copper, aluminum foil or iron pipe. The shield 11 is shielded by a conductor 11 such as a cylindrical metal body, and the conductor 11 is fixed to the metal base 5 by screwing or the like, thereby providing noise prevention means. Note that, by connecting one end of the induction coil 2 and the base portion 5 via the capacitor C, the base portion 5 is at the same potential in terms of high frequency as the ground side of the high-frequency power supply circuit 8 as shown in FIG. I have to.
[0021]
Also in this reference example , noise radiated from the lead portion 2b can be reduced with a simple configuration.
[0022]
FIG. 5 is a schematic configuration diagram of an electrodeless discharge lamp apparatus according to the second embodiment of the present invention. This embodiment incorporates all the noise prevention means of the first embodiment and the reference example described above. There is a mesh-like metal strand as the conductor 11. That is,
The lead portion 2b is twisted and a conductor 11 in which a large number of metal strands are formed in a mesh shape is formed around the lead portion 2b, and the conductor 11 is at the same potential as the ground side of the high-frequency power circuit.
[0023]
According to the present embodiment, by providing the three noise preventing means, the effect of reducing the noise radiated from the lead portion 2b is improved as compared with the case where only the individual noise preventing means are used.
[0024]
FIG. 6 is a schematic configuration diagram of an electrodeless discharge lamp apparatus according to a third reference example of the present invention. In this reference example , an inner conductor 12a and a shield 12b are provided on each of two lead portions 2b of the induction coil 2. The coaxial cable 12 is used. The inner conductor 12a of each coaxial cable 12 is connected to the coil portion 2a, and the shield 12b is connected to the base portion 5 so as to have the same potential. Further, one end of the induction coil 2 and the base portion 5 are connected via a capacitor C.
[0025]
According to this reference example , by using the coaxial cable 12 having the inner conductor 12a and the shield 12b for each of the two lead portions 2b of the induction coil 2, noise radiated from the lead portion 2b can be reduced with a simple configuration. it can.
[0026]
FIG. 7 is a schematic configuration diagram of an electrodeless discharge lamp device according to a fourth reference example of the present invention. In this reference example , one triple coaxial cable 13 is used as two lead portions 2b of the induction coil 2. It is what was used. The coaxial cable 13 includes an inner conductor 13a, an outer conductor 13b, and a shield 13c. The inner conductor 13a of the coaxial cable 13 is connected to one end of the coil portion 2a, the outer conductor 13b is connected to the other end of the coil portion 2a, and the shield 13b is connected to the base portion 5 so as to have the same potential. Further, one end of the induction coil 2 and the base portion 5 are connected via a capacitor C.
[0027]
According to the present embodiment, by using the triple coaxial cable 13 having the inner conductor 13a, the outer conductor 13b, and the shield 13c for the lead portion 2b of the induction coil 2, noise radiated from the lead portion 2b can be reduced with a simple configuration. Can be reduced.
[0028]
FIG. 8 is a schematic configuration diagram of an electrodeless discharge lamp device according to a fifth reference example of the present invention. In this reference example , the conductor 11 as shown in FIG. 3 is applied to the lead portion 2b of the induction coil 2. Thus, noise prevention means is provided, and a flexible wire mesh 20 is provided around the electrodeless discharge lamp L and the induction coil 2, and the wire mesh 20 is connected to the base portion 5 by screws or the like. Is connected to the ground side of the high frequency power supply circuit 8 via a capacitor C, so that the wire mesh 20 is at the same potential in terms of frequency as the ground side of the high frequency power supply circuit 8, and the conductor portion of the induction coil 2 and the wire mesh 20 are In the meantime, proximity preventing means made of a non-metallic body 21 is provided for securing a distance equal to or larger than the diameter of the conductor portion of the induction coil 2 (consisting of the conductor portion of the central portion and the insulator covering portion).
[0029]
According to this reference example , a flexible wire mesh 20 is provided around the electrodeless discharge lamp L and the induction coil 2, and the wire mesh 20 has the same potential as the ground side of the high-frequency power supply circuit 8. The effect of reducing the noise radiated from the part 2b can be further enhanced. Further, since the proximity prevention means 21 secures a distance equal to or larger than the diameter of the conductor portion of the induction coil 2 between the conductor portion of the induction coil 2 and the wire mesh 20, the flexible wire mesh 20 is used as a high frequency power source. The operation of the circuit 8 is not adversely affected. Further, the wire mesh 30 as the shielding means described in Japanese Patent Laid-Open No. 2-170341 has been required to increase the diameter of the metal wire constituting the wire mesh 30 to some extent in order to enable self-holding. In this reference example , by using the flexible wire mesh 20, the diameter of the metal wire constituting the wire mesh 20 can be reduced, so that attenuation of the luminous flux of the electrodeless discharge lamp device can be suppressed.
[0030]
FIG. 9 is a schematic configuration diagram of an electrodeless discharge lamp device according to a sixth reference example of the present invention. This reference example is the electrodeless discharge lamp device of the fifth reference example. The substantially transparent resin cover 22 is used as a proximity preventing means for securing a distance equal to or larger than the diameter of the conductor portion of the induction coil 2 between the conductor portion of the induction coil 2 and the wire mesh 20. Is. The periphery of the electrodeless discharge lamp L and the induction coil 2 is covered with a resin cover 22, and the periphery thereof is covered with a flexible wire mesh 20. Furthermore, by holding the flexible metal mesh 20 with the ring 23 and fixing it to the base 5 by screwing or the like, the base portion 5 and the metal mesh 20 can be easily set to the same potential.
[0031]
FIG. 10 is a schematic configuration diagram of an electrodeless discharge lamp apparatus according to a seventh reference example of the present invention. This reference example is the same as the electrodeless discharge lamp apparatus of the fifth reference example. The thickness L of the insulator covering portion of the induction coil 2 is set to be equal to or larger than the diameter 2r of the conductor portion as a proximity preventing means for securing a distance between the wire mesh 20 and the diameter of the conductor portion of the induction coil 2. It is made to comprise. Furthermore, the flexible metal mesh 20 is sandwiched from the side by the ring 24 and fixed to the base 5 by screwing or the like, so that the base portion 5 and the metal mesh 20 can have the same potential easily and reliably.
[0032]
FIG. 11 is a schematic configuration diagram of an electrodeless discharge lamp device according to an eighth reference example of the present invention. This reference example is a coil part 2a of the induction coil 2 in the electrodeless discharge lamp device of the second reference example. As shown in FIG. 12, a metal foil 40 made of copper, aluminum, or the like is formed approximately one turn along the outer periphery of the glass bulb 1 while being electrically insulated from the coil portion 2a. Is. Only one end 41 of the metal foil 40 is connected to one lead 2b.
[0033]
In this reference example , the circuit configuration is as shown in FIG. 13, and the phase difference between the voltage generated in the coil portion 2a and the voltage generated in the metal foil 40 during the operation of the high-frequency power supply circuit 8 is approximately 180 °. The electric field generated in the coil part 2a cancels and decreases, and radiation noise generated from the coil part 2a is reduced.
[0034]
FIG. 14 shows another example of the metal foil 40, and the metal foil 50 in which the slits 52 are formed is used. Only the end portion 51 is connected to one lead portion 2b. In this case, as shown in FIG. 15, each electric wire constituting the coil portion 2 a is arranged close to each of the metal foils 50 divided by the slits 52. Compared to the case of the metal foil 40, the ratio of canceling out the electric field generated in the coil portion 2a is large, and radiation noise generated from the coil portion 2a is further reduced.
[0035]
FIG. 16 shows another example of the metal foil 40, which is composed of a divided metal foil 60 and a metal foil 70. In each of the metal foils 60 and 70, slits 62 and 72 and end portions 61 and 71 are formed. As shown in the circuit configuration of FIG. 17, the end portion 61 of the metal foil 60 is connected to one lead portion 2b of the two lead portions 2b, and the end portion 71 of the metal foil 70 is connected to the other lead portion 2b. Connected to. In this case, the same effect as that obtained when the metal foil 50 is used is obtained.
[0036]
【The invention's effect】
As described above, according to the first to third aspects of the invention, since the ferrite core penetrating through the two lead portions of the induction coil is provided at a time, the lead portion is radiated with a simple configuration. Noise can be reduced.
[0038]
According to a seventh aspect of the invention, in the sixth aspect of the invention, the induction coil is composed of a conductor portion and an insulator covering portion, and the shield means is formed of a flexible wire mesh, and the wire mesh and the wire Proximity prevention means is provided between the induction coil and a distance greater than the diameter of the conductor portion of the induction coil, so that the flexible wire mesh does not adversely affect the operation of the high frequency power supply circuit. .
[0039]
According to an eighth aspect of the present invention, in the invention according to any one of the first to seventh aspects, the metal body is disposed along the coil portion between the coil portion of the induction coil and the glass bulb. Because it is arranged close to each other and one end of the metal body is connected to the lead part, the voltage across the coil part and the voltage across the metal body change with opposite polarities, so noise generated from the induction coil Can be further enhanced.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an electrodeless discharge lamp apparatus according to a first reference example of the present invention.
FIG. 2 is a schematic configuration diagram showing an electrodeless discharge lamp apparatus according to the first embodiment of the present invention.
FIG. 3 is a schematic configuration diagram showing an electrodeless discharge lamp device according to a second reference example of the present invention.
FIG. 4 is a circuit diagram according to the above.
FIG. 5 is a schematic configuration diagram showing an electrodeless discharge lamp device according to a second embodiment of the present invention.
FIG. 6 is a schematic configuration diagram showing an electrodeless discharge lamp device according to a third reference example of the present invention.
FIG. 7 is a schematic configuration diagram showing an electrodeless discharge lamp device according to a fourth reference example of the present invention.
FIG. 8 is a schematic configuration diagram showing an electrodeless discharge lamp device according to a fifth reference example of the present invention.
FIG. 9 is a schematic configuration diagram showing an electrodeless discharge lamp apparatus according to a sixth reference example of the present invention.
FIG. 10 is a schematic configuration diagram showing an electrodeless discharge lamp device according to a seventh reference example of the present invention.
FIG. 11 is a schematic configuration diagram showing an electrodeless discharge lamp apparatus according to an eighth reference example of the present invention.
FIG. 12 is a schematic configuration diagram showing a metal foil according to the same.
FIG. 13 is a circuit diagram of an electrodeless discharge lamp device according to an eighth reference example of the present invention.
FIG. 14 is a schematic configuration diagram showing another example of a metal foil according to an eighth reference example of the present invention.
FIG. 15 is a schematic view showing an arrangement state with a coil portion when the above metal foil is used.
FIG. 16 is a schematic configuration diagram showing still another example of the metal foil according to the eighth reference example of the present invention.
FIG. 17 is a circuit diagram when the metal foil is used.
FIG. 18 is a schematic configuration diagram showing an electrodeless discharge lamp device according to a previous application.
FIG. 19 is a schematic configuration diagram showing a conventional electrodeless discharge lamp device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Glass bulb 2 Inductive coil 2a Coil part 2b Lead part 3 Metal cylindrical body 4 Discharge plasma 5 Base part 6 Matching circuit 7 Cable 8 High frequency power supply circuit 9 Phosphor 10 Ferrite core 11 Conductor 12 Coaxial cable 12a Inner conductor 12b Shield 13 3 Heavy Coaxial Cable 13a Inner Conductor 13b Outer Conductor 13c Shield 20 Wire Mesh 21 Proximity Prevention 22 Resin Cover 23 Ring 24 Ring 30 Wire Mesh 40 Metal Foil 41 End 50 Metal Foil 51 End 52 Slit 60 Metal Foil 61 End 62 Slit 70 Metal foil 71 End 72 Slit L Electrode discharge lamp k Recess

Claims (3)

An electrodeless discharge lamp in which a discharge gas such as an inert gas or a metal vapor is sealed in a glass bulb; a coil portion disposed in proximity to the outside of the electrodeless discharge lamp; and an induction coil having two lead portions; An electrodeless discharge lamp apparatus having a high-frequency power supply circuit connected to the induction coil and supplying high-frequency power to the induction coil, wherein a ferrite core penetrating through the two lead portions of the induction coil is provided . An electrodeless discharge lamp device. Electrodeless discharge lamp device according to claim 1, characterized in that so as to constitute by twisting the lead portion before Symbol induction coil. Around the lead portion of the front Symbol induction coil, a plurality of metal wires forming a conductor formed in a mesh shape or a braided, a conductor by the ground side and the high frequency to the same potential of the high-frequency power supply circuit 2. The electrodeless discharge lamp device according to claim 1, wherein the electrodeless discharge lamp device is configured.

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