JP2004031052A - Electrodeless discharge lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrodeless discharge lamp capable of easily ensuring adhesion of a heat conductor to a ferrite core, allowing reduction of the total length of the ferrite core by reducing the winding width of an induction coil, and structured so as to effectively ensure insulation capability of the induction coil. <P>SOLUTION: A power coupler 3 is provided with an assembly core comprising: a plurality of ferrite cores 11 for winding the induction coil 8; and the heat conductor 10 for tightly disposing the respective ferrite cores 11 on its outside surface. The heat conductor 10 constituting the assembly core is formed into a cross-sectionally circular shape, and each ferrite core 11 is formed into a cross-sectionally curved shape tightly fitting to the outside surface of the heat conductor 10. The induction coil 8 is a cross-sectionally rectangular pillar wire, and wound on the outside surface of the ferrite cores 11 with edgewise winding. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electrodeless discharge lamp, and more particularly, to a structure of a power combiner.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been a lighting fixture called an electrodeless discharge lamp, and an example thereof is disclosed in Japanese Patent Application Laid-Open No. 6-196006. That is, the electrodeless discharge lamp includes an airtight container filled with a discharge gas, and a power coupler housed in a concave cavity of the airtight container. The power combiner includes an induction coil that excites a discharge gas and emits light by generating a high-frequency electromagnetic field accompanying the application of a high-frequency current, and a ferrite core around which the induction coil is wound.
[0003]
In the electrodeless discharge lamp, it is inevitable that the temperature of the induction coil and the ferrite core becomes extremely high due to the influence of heat generated by the discharge and the self-heating. If the temperature of the induction coil, the ferrite core, and other insulators exceeds the allowable operating temperature, the electrodeless discharge lamp may not function properly or may have a short life. For example, when the temperature of the magnetic core becomes high, the magnetic flux is saturated and the lamp efficiency is lowered, or the lamp cannot be kept lit and is turned off.
[0004]
In order to solve such inconveniences, a conventional electrodeless discharge lamp is a hollow round rod having a circular cross section as shown in the perspective view of FIG. 12 and the plan view of FIG. An assembling core having a structure in which a metal heat conductor 51 is prepared, and the heat conductor 51 is directly inserted into a ferrite core 52 which is a hollow round bar having a large diameter and in close contact with the ferrite core 52 is provided. Has been adopted. That is, the heat conductor 51 at this time functions as a member that radiates heat accumulated in the ferrite core 52 to the outside.
[0005]
Further, at this time, the induction coil 53 is wound along the outer surface of the ferrite core 52 in which the heat conductor 51 is inserted. In this case, the induction coil 53 generally has a structure in which an insulating coating layer is formed on the outer surface of a core wire having a circular cross section.
[0006]
[Problems to be solved by the invention]
By the way, in the above-mentioned conventional assembly core, it is necessary to bring the heat conductor 51 and the ferrite core 52 into close contact with each other in order to maximize the heat dissipation effect of the heat conductor 51 on the ferrite core 52. However, since each of the heat conductor 51 and the ferrite core 52 is an integral body, when the heat conductor 51 is directly interpolated into the ferrite core 52, the heat conductor 51 and the ferrite core 52 must be slightly inserted between them. Must exist.
[0007]
That is, if there is no slight gap between the heat conductor 51 and the ferrite core 52, it is impossible to insert the heat conductor 51 into the ferrite core 52, and between them. As long as there is a gap, the adhesion between the heat conductor 51 and the ferrite core 52 cannot be ensured. Therefore, in the case of an assembled core having a conventional structure, it is difficult to secure the adhesion between the heat conductor 51 and the ferrite core 52, and the heat dissipation of the ferrite core 52 is maximized by the heat conductor 51. The fact is that it is difficult to pull out to the limit.
[0008]
Further, in the assembly core having the conventional structure, an induction coil 53 in which an insulating coating layer is formed on the outer surface of a core wire having a circular cross section is formed on the outer surface of the ferrite core 52 by one. Since the winding is generally performed in layers, the winding width of the induction coil 53 increases, and as a result, the total length of the ferrite core 52 increases, resulting in an increase in iron loss. Further, under a high temperature state, the coating layer of the induction coil 53 may be carbonized, and the insulative property between the core wires of the induction coil 53 may not be secured.
[0009]
The present invention has been made in view of these inconveniences, and it is easy to secure the adhesion between the heat conductor and the ferrite core, and to reduce the winding width of the induction coil to reduce the ferrite core. It is an object of the present invention to provide an electrodeless discharge lamp having a configuration in which the total length of the core can be shortened and the insulation of the induction coil can be effectively secured.
[0010]
[Means for Solving the Problems]
An electrodeless discharge lamp according to the first aspect of the present invention includes an airtight container filled with a discharge gas, and a power coupler inserted into a concave cavity of the airtight container, wherein the power coupler has a high frequency current. And an induction coil that excites the discharge gas and emits light by generating a high-frequency electromagnetic field accompanying the application of the electric field. In this case, the power coupler is an assembled core including a plurality of ferrite cores around which the induction coil is wound, and a heat conductor in which each of the ferrite cores is disposed in close contact with the outer surface. Wherein the heat conductor constituting the assembled core has a circular shape in cross section, while each of the ferrite cores has a curved shape in cross section which is in close contact with the outer surface of the heat conductor. It is characterized by the following.
[0011]
An electrodeless discharge lamp according to a second aspect of the present invention is the electrodeless discharge lamp according to the first aspect, wherein the induction coil is a rectangular wire having a rectangular shape in cross section, and is edgewise wound on the outer surface of the ferrite core. It is characterized by being wound.
[0012]
The electrodeless discharge lamp according to the invention according to claim 3 is the electrodeless discharge lamp according to claim 2, wherein a short side of the induction coil is in contact with an outer surface of the ferrite core, and a long side is the long side. The ferrite core is wound so as to protrude from the outer surface.
[0013]
According to a fourth aspect of the present invention, there is provided the electrodeless discharge lamp according to the second aspect, wherein the induction coil is wound such that a long side of the induction coil is in contact with an outer surface of the ferrite core. Features.
[0014]
An electrodeless discharge lamp according to a fifth aspect of the present invention is the electrodeless discharge lamp according to the third or fourth aspect, wherein an end of the induction coil is formed at an end of the heat conductor and the ferrite core. It is housed and fixed in the groove.
[0015]
An electrodeless discharge lamp according to a sixth aspect of the present invention is the electrodeless discharge lamp according to the third or fourth aspect, wherein an end of the induction coil is joined to an end of the heat conductor. I do.
[0016]
An electrodeless discharge lamp according to a seventh aspect of the present invention is the electrodeless discharge lamp according to the first aspect, wherein an insulating sleeve is interposed between the induction coil and the ferrite core, and the induction coil has a cross section. It is characterized by being formed into a rectangular wire in a rectangular shape when viewed and then being wound edgewise on the outer surface of the insulating sleeve.
[0017]
An electrodeless discharge lamp according to an eighth aspect of the present invention is the electrodeless discharge lamp according to the first aspect, wherein the induction coil has a circular shape in cross section, and guides the induction coil to an outer surface of the ferrite core. A guide groove is formed.
[0018]
An electrodeless discharge lamp according to a ninth aspect of the present invention is the electrodeless discharge lamp according to the first aspect, wherein an insulating sleeve is interposed between the induction coil and the ferrite core, and the induction coil has a cross section. A guide groove for guiding the induction coil is formed on the outer surface of the insulating sleeve while having a circular shape when viewed.
[0019]
An electrodeless discharge lamp according to a tenth aspect of the present invention is the electrodeless discharge lamp according to the first aspect, wherein the induction coil has an inner and outer double coating layer having different melting points on an outer surface of a core wire having a circular cross section. Are laminated, and the outer coating layer having a lower melting point than the inner coating layer is melted at a point after winding the induction coil on the outer surface of the ferrite core. And
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is an overall sectional view showing the structure of the electrodeless discharge lamp according to the first and second embodiments, and FIG. 2 is a diagram showing the main structure of an assembly core provided in the electrodeless discharge lamp according to the first embodiment. FIG. 3 is an overall perspective view showing a structure of an assembled core provided in the electrodeless discharge lamp according to the first embodiment, with a part thereof omitted. FIG. 4 is an external perspective view showing a first modified example of the assembly core provided in the electrodeless discharge lamp according to the first embodiment, and FIG. 5 is provided with the electrodeless discharge lamp according to the first embodiment. FIG. 10 is an overall sectional view showing a second modified example of the assembled core.
[0021]
FIG. 6 is an overall sectional view showing a third modification of the assembled core provided in the electrodeless discharge lamp according to the first embodiment. FIG. 7 is provided with the electrodeless discharge lamp according to the first embodiment. FIG. 14 is an overall sectional view showing a fourth modified example of the assembled core. FIG. 8 is an overall sectional view showing the structure of an assembled core provided in the electrodeless discharge lamp according to the second embodiment. FIG. 9 is an assembled core provided in the electrodeless discharge lamp according to the second embodiment. It is a whole sectional view showing the 1st modification of.
[0022]
FIG. 10 is a cross-sectional view showing a modification of the induction coil constituting the assembly core provided in the electrodeless discharge lamp according to the second embodiment. FIG. 11 is a sectional view showing the electrodeless discharge lamp according to the second embodiment. It is a principal part sectional view which shows the 2nd modification of the assembly core with which is provided.
[Embodiment 1]
As shown in FIG. 1, the electrodeless discharge lamp according to the first embodiment includes an airtight container 1 made of a translucent material in which a discharge gas is sealed, a concave cavity 2 provided in the airtight container 1, And a power combiner 3 inserted into the concave cavity 2. A rare gas such as argon or krypton and mercury are sealed as a discharge gas in the hermetic container 1, and a phosphor film 4 and a protective film 5 are applied on the inner surface thereof. Note that the phosphor film 4, the protective film 5, and the reflective film 6 are also applied on the inner surface of the concave cavity 2.
[0023]
Further, the electrodeless discharge lamp has a discharge space in which the hermetic container 1 and the concave cavity 2 are sealed at the bottom of the envelope, and the exhaust thin tube 7 is sealed at the top of the concave cavity 2. A discharge gas is also sealed therein. Further, the power combiner 3 at this time includes an induction coil 8 for exciting a discharge gas to emit light by generating a high-frequency electromagnetic field accompanying the application of a high-frequency current, and an assembly core around which the induction coil 8 is wound. ing.
[0024]
As shown in FIG. 2, the assembled core includes a single heat conductor 10 and a plurality (four in the figure) of ferrite cores arranged in parallel along the outer periphery of the heat conductor 10. 11 is combined. Although the number of ferrite cores 11 is four here, it is needless to say that the number of ferrite magnetic cores 11 is not limited to four and may be two or more.
[0025]
That is, the heat conductor 10 is a metal cylinder, such as aluminum, which is a hollow round rod having a circular shape in cross section, and a metal cylinder made of aluminum or the like. A space for arranging the exhaust thin tube is formed. An exhaust tube 7 is inserted into this space, and the exhaust tube 7 has an amalgam 13 for controlling the vapor pressure of mercury and a glass rod 14 for fixing the position of the amalgam 13. Are arranged respectively.
[0026]
On the other hand, each of the ferrite magnetic cores 11 is a flat plate member having a curved shape in a cross-sectional view so as to be able to adhere to the outer surface of the heat conductor 10. Then, it is arranged along the outer surface of the heat conductor 10. That is, in this case, since the heat conductor 10 has a circular shape in cross-section and each of the magnetic cores 11 has a curved shape in cross-section in close contact with the outer surface of the heat conductor 10, The magnetic core 11 is always disposed in a state of being in close contact with the outer surface of the heat conductor 10.
[0027]
Further, the induction coil 8 is wound around the assembled core having such a configuration, and as shown in FIG. 3, the induction coil 8 is formed into a rectangular wire having a rectangular shape in cross section. The ferrite core 11 is wound around the outer surface of each of the ferrite cores 11 in an edgewise manner. That is, the induction coil 8 is wound such that its short side is in contact with the outer surface of each of the ferrite cores 11 and its long side is protruded from the outer surface of the ferrite core 11.
[0028]
In this configuration, since the induction coil 8 is a rectangular wire, the winding width L can be shorter than in a normal winding method while maintaining the entire cross-sectional area of the wound induction coil 8 equal to that in the related art. As a result, the overall length of the ferrite core 11 can be shortened. Therefore, the size of the induction coil 8 is reduced as a whole, and the advantage that iron loss generated in the ferrite core 11 is suppressed is ensured.
[0029]
Even in the case of the ferrite core 11 made of a non-conductive Ni—Zn-based magnetic material, the short side, which is one end surface of the induction coil 8, which is a rectangular wire, is directly in contact with the outer surface of the ferrite core 11. , The heat generated by the induction coil 8 can be efficiently transmitted to the heat conductor 10 via the ferrite core 11. At this time, if the flat rectangular induction coil 8 is insulated and coated with Teflon (registered trademark) or the like, the ferrite core 11 can be manufactured using a Mn-based magnetic material having high magnetic permeability. , Q can be expected to increase.
[0030]
By the way, in the assembled core according to the present embodiment, as in the first modified example shown in FIG. 4, grooves 21 are formed at end positions of the heat conductor 10 and the ferrite core 11, and the ferrite core is formed. It is preferable that the ends of the induction coils 8 wound on the respective outer surfaces 11 are housed in the grooves 21 and fixed. That is, when winding the induction coil 8 which is a rectangular wire, the winding start portion and the winding end portion are liable to be separated, but the groove portions 21 are previously provided at the end positions of the heat conductor 10 and the ferrite core 11. Is formed, it becomes easy to fix the end of the induction coil 8. Note that such a fixed portion may be covered with a cap (not shown).
[0031]
Also, as in a second modification shown in FIG. 5, the terminal end of the induction coil 8 wound along the outer surface of each of the ferrite cores 11 is joined to the end of the heat conductor 10. Is also good. The black circles in FIG. 5 represent the joining points.
[0032]
In other words, when the terminal end reaches the upper side as a result of starting winding the induction coil 8 from the lower side, a process of returning the terminal end of the induction coil 8 to the lower side is required. However, when the heat conductor 10 is made of a metal having good heat conductivity, the end of the induction coil 8 is joined to the end of the heat conductor 10 and the heat conductor 10 itself is connected to the induction coil 8. Can be used as a current supply path, so that the processing of the end portion of the induction coil 8 is facilitated.
[0033]
Further, in the present embodiment, when the induction coil 8 which is a rectangular wire is wound along the ferrite core 11 of the assembly core, the short side of the induction coil 8 contacts the outer surface of each ferrite core 11, In addition, the long side is wound by edgewise winding so as to project from the outer surface of the ferrite core 11. However, the long side of the induction coil 8 may be in contact with the outer surface of the ferrite core 11 as in the third modification shown in FIG.
[0034]
That is, when the long side of the induction coil 8 is in contact with the outer surface of the ferrite core 11, the contact area between the induction coil 8 and the ferrite core 11 increases, and the heat of the induction coil 8 is reduced by the heat of the induction coil 8. It becomes easy to be efficiently transmitted to 11 and the heat conductor 10. Therefore, such a configuration is effective when the copper loss of the induction coil 8 is larger than the iron loss of the ferrite core 11 and the temperature rise of the induction coil 8 becomes a problem.
[0035]
Further, as in a fourth modified example of the assembled core shown in FIG. 7, an insulating sleeve 22 is interposed between the induction coil 8 and the ferrite core 11, and the induction coil 8 is formed into a rectangular wire having a rectangular cross section. May be wound on the outer surface of the insulating sleeve 22 by edgewise winding. In such a configuration, the insulation between the induction coil 8 and the ferrite core 11 can be effectively maintained, and the ferrite core 11 is formed of a material having conductivity but having high magnetic permeability, such as a Mn-based magnetic material. It can also be manufactured. In this case, since a relatively strong magnetic field can be generated, the advantage that the energy transfer efficiency to the lamp plasma is improved is secured.
[Embodiment 2]
The electrodeless discharge lamp according to the second embodiment includes an airtight container 1 and a power coupler 3 inserted into a concave cavity 2 thereof, as in the first embodiment described with reference to FIG. The power combiner 3 includes an induction coil 8 and an assembled core around which the induction coil 8 is wound. The assembled core at this time has a metal heat conductor 10 which is a hollow round bar having a circular shape in cross section and a curved shape in cross section which can be in close contact with the outer surface of the heat conductor 10. And a plurality (four in the figure) of ferrite cores 11 arranged along the outer surface of the wound heat conductor 10.
[0036]
Further, the induction coil 8 wound around the assembly core has a circular shape in cross section, and the induction coil 8 extends along the outer surface of each of the ferrite cores 11 constituting the assembly core. It is wound. Further, at this time, as shown in FIG. 8, a guide groove 23 for guiding the induction coil 8 having a circular cross section is formed on the outer surface of each of the ferrite cores 11 so as to have a rectangular shape in cross section. The induction coil 8 is wound on the outer surface of each of the ferrite cores 11 while being guided by the guide grooves 23.
[0037]
When such a guide groove 23 is formed, not only is it easy to wind the induction coil 8 around the outer surface of each of the ferrite cores 11, but also the insulation distance of each adjacent portion of the induction coil 8 is reduced. It can be easily secured. In addition, since the contact area between the induction coil 8 and each ferrite core 11 increases, it is also possible to realize an improvement in the heat radiation effect of the heat conductor 10 via the ferrite core 11.
[0038]
Although the guide groove 23 has a rectangular shape in cross section in FIG. 8, the cross sectional shape is not limited, and the bottom surface is semicircular as shown in FIG. 9 showing a first modification of the assembly core. Needless to say, the guide groove 23 may be curved as a shape. Incidentally, although not shown, the insulating sleeve 22 may be interposed between the induction coil 8 and the ferrite core 11 in some cases. In this case, the guide groove 23 is formed on the outer surface of the insulating sleeve 22.
[0039]
Further, as shown in FIG. 10, the induction coil 8 includes inner and outer double coating layers having different melting points, that is, an inner coating layer 25 and an outer coating layer 26 on the outer surface of a core wire 24 having a circular cross section. They may be formed by laminating each other. That is, in this case, the melting point of the material forming the outer coating layer 26 is set lower than the melting point of the material forming the inner coating layer 25 in advance. As shown in FIG. 11, the outer coating layer 26 is melted with the heat treatment at a point after the induction coil 8 is wound along the outer surface of each of the ferrite cores 11.
[0040]
In such a configuration, since the outer coating layers 26 of the induction coil 8 melted by the heat treatment are mixed with each other, when cooled in a subsequent step, as shown in FIG. The core wire 24 and the inner coating layer 25 of the induction coil 8 wound along the outer surface are fixed to the ferrite core 11 by the outer coating layer 26 that has been melted. Therefore, it is not necessary to fix the winding start portion and the winding end portion of the induction coil 8, and even if the core wire 24 or the ferrite core 11 of the induction coil 8 becomes hot, the insulation property is not deteriorated. Disappears.
[0041]
【The invention's effect】
In the electrodeless discharge lamp according to the first aspect of the present invention, the heat conductor has a circular shape in a sectional view, and each of the ferrite cores has a curved shape in a sectional view in close contact with an outer surface of the heat conductor. Each of the magnetic cores is disposed along an outer surface of the thermal conductor. Therefore, the close contact between the heat conductor and the ferrite core is ensured, and the heat radiation of the induction coil and the ferrite core can be maximized by the heat conductor. As a result, an effect is obtained that it is easy to increase the luminous efficiency and extend the service life.
[0042]
In the electrodeless discharge lamp according to the second aspect of the present invention, the induction coil is a rectangular wire having a rectangular cross section, and is wound around the outer surface of the ferrite core by edgewise winding. According to the third aspect of the present invention, the short side of the induction coil is brought into contact with the outer surface of the ferrite core, and the long side is wound so as to protrude from the outer surface of the ferrite core. Is being done.
[0043]
Therefore, even if the whole sectional area of the wound induction coil is kept equal to the conventional one, the winding width can be short, and as a result, the entire length of the ferrite core can be short. Therefore, the size of the induction coil is reduced in size as a whole, and an effect that iron loss generated in the ferrite core can be effectively suppressed can be obtained.
[0044]
In the electrodeless discharge lamp according to the fourth aspect of the invention, the induction coil is wound with its long side in contact with the outer surface of the ferrite core. Therefore, the contact area between the induction coil and the ferrite core increases, and the advantage that the heat of the induction coil is easily transmitted to the ferrite core and the heat conductor efficiently is ensured.
[0045]
In the electrodeless discharge lamp according to the fifth aspect of the present invention, the ends of the induction coil are housed and fixed in the grooves formed at the end positions of the heat conductor and the ferrite core. That is, when winding an induction coil which is a rectangular wire, the winding start portion and the winding end portion are likely to be separated, but grooves are formed in advance at the end positions of the heat conductor and the ferrite core. In this case, an effect is obtained that the end of the induction coil can be easily fixed.
[0046]
In the electrodeless discharge lamp according to the invention, the end of the induction coil is joined to the end of the heat conductor. As described above, when the end of the induction coil is joined to the end of the heat conductor, the heat conductor itself can be used as a current supply path to the induction coil. An effect is obtained that processing at the end portion is facilitated.
[0047]
In the electrodeless discharge lamp according to the seventh aspect of the present invention, an insulating sleeve is interposed between the induction coil and the ferrite core, and the induction coil, which is a rectangular wire having a rectangular cross section when viewed from above, is formed of an insulating sleeve. It has been practiced to wind the outer surface with edgewise winding. With such a configuration, the advantage that the insulation between the induction coil and the ferrite core can be effectively and reliably maintained by the insulating sleeve is ensured.
[0048]
In the electrodeless discharge lamp according to the eighth aspect of the invention, the induction coil has a circular shape in cross section, and a guide groove for guiding the induction coil is formed on the outer surface of the ferrite core. Therefore, not only can the induction coil be easily wound around the outer surface of each of the ferrite cores, but also the insulation distance of each adjacent portion of the induction coil can be easily secured. Further, since the contact area between the induction coil and each ferrite core increases, an effect of improving the heat radiation effect of the heat conductor through the ferrite core can be obtained.
[0049]
In the electrodeless discharge lamp according to the ninth aspect of the present invention, an insulating sleeve is interposed between the induction coil and the ferrite core, and a guide groove for guiding the induction coil having a circular cross section is insulated. Formed on the outer surface of the sleeve. Therefore, the effect that the insulating property between the induction coil and the ferrite core is effectively and reliably maintained by the insulating sleeve and the induction coil can be easily wound can be obtained.
[0050]
In the electrodeless discharge lamp according to the tenth aspect of the invention, the inner and outer double coating layers having different melting points are formed on the outer surface of the core wire having a circular shape in a sectional view of the induction coil, and the inner and outer coating layers are different from each other. The outer coating layer having a low melting point is melted at a point after the induction coil is wound on the outer surface of the ferrite core.
[0051]
In such a configuration, since the outer coating layer of the induction coil melted by the heat treatment mixes with each other, the core wire and the inner coating layer of the induction coil wound along the outer surface of the ferrite core are formed on the outer coating layer. It is fixed to the ferrite core by the coating layer. Therefore, it is not necessary to fix the winding start portion and the winding end portion of the induction coil, and even if the temperature of the core wire of the induction coil or the ferrite core becomes high, the insulation property is not impaired. can get.
[Brief description of the drawings]
FIG. 1 is an overall sectional view showing a structure of an electrodeless discharge lamp according to a first embodiment and a second embodiment.
FIG. 2 is an external perspective view of the electrodeless discharge lamp according to the first embodiment, showing a part of the structure of an assembly core included in the electrodeless discharge lamp, partially omitted;
FIG. 3 is an overall sectional view showing a structure of an assembly core provided in the electrodeless discharge lamp according to the first exemplary embodiment;
FIG. 4 is an external perspective view showing a first modified example of the assembly core provided in the electrodeless discharge lamp according to the first exemplary embodiment;
FIG. 5 is an overall sectional view showing a second modified example of the assembled core provided in the electrodeless discharge lamp according to the first exemplary embodiment;
FIG. 6 is an overall sectional view showing a third modified example of the assembly core provided in the electrodeless discharge lamp according to the first exemplary embodiment;
FIG. 7 is an overall sectional view showing a fourth modified example of the assembly core provided in the electrodeless discharge lamp according to the first exemplary embodiment;
FIG. 8 is an overall sectional view showing a structure of an assembly core provided in the electrodeless discharge lamp according to the second exemplary embodiment;
FIG. 9 is an overall sectional view showing a first modified example of the assembly core provided in the electrodeless discharge lamp according to the second exemplary embodiment;
FIG. 10 is a cross-sectional view showing a modified example of the induction coil constituting the assembled core provided in the electrodeless discharge lamp according to the second embodiment.
FIG. 11 is a cross-sectional view of a main part showing a second modified example of the assembly core included in the electrodeless discharge lamp according to the second embodiment;
FIG. 12 is an external perspective view showing a part of a structure of a main part of an assembling core provided in an electrodeless discharge lamp according to a conventional embodiment.
FIG. 13 is a plan view of a main part showing a structure of an assembly core provided in an electrodeless discharge lamp according to a conventional form.
[Explanation of symbols]
1 airtight container
2 concave cavity
3 Power combiner
8 Induction coil
10. Thermal conductor
11 Ferrite core
21 Groove
22 Insulation sleeve
23 Guide groove
24 core wire
25 Inner coating layer
26 Outer coating layer

Claims (10)

An airtight container filled with a discharge gas; and a power coupler inserted into a concave cavity of the airtight container. An electrodeless discharge lamp comprising an induction coil that excites gas to emit light,
The power coupler includes an assembly core including a plurality of ferrite cores around which the induction coil is wound, and a thermal conductor in which each of the ferrite cores is disposed in close contact with an outer surface. The heat conductor constituting the assembled core is formed in a circular shape in cross section, while each of the ferrite cores is formed in a curved shape in cross section in close contact with an outer surface of the heat conductor. Electrodeless discharge lamp. 2. The electrodeless discharge lamp according to claim 1, wherein the induction coil is a rectangular flat wire having a rectangular cross section, and is wound around the outer surface of the ferrite core by edgewise winding. 3. 3. The induction coil according to claim 2, wherein a short side of the induction coil is in contact with an outer surface of the ferrite core, and a long side of the induction coil is wound so as to protrude from the outer surface of the ferrite core. An electrodeless discharge lamp as described. The electrodeless discharge lamp according to claim 2, wherein the induction coil is wound such that a long side of the induction coil is in contact with an outer surface of the ferrite core. 5. The electrodeless discharge according to claim 3, wherein an end of the induction coil is housed and fixed in a groove formed at an end of the heat conductor and the ferrite core. 6. lamp. The electrodeless discharge lamp according to claim 3 or 4, wherein an end of the induction coil is joined to an end of the heat conductor. An insulating sleeve is interposed between the induction coil and the ferrite core, and the induction coil is formed into a rectangular flat wire having a rectangular cross section in a sectional view, and is wound around the outer surface of the insulating sleeve by edgewise winding. The electrodeless discharge lamp according to claim 1, wherein the lamp is turned. The electrodeless discharge lamp according to claim 1, wherein the induction coil has a circular shape in cross section, and a guide groove for guiding the induction coil is formed on an outer surface of the ferrite core. An insulating sleeve is interposed between the induction coil and the ferrite core, and the induction coil has a circular shape in cross section, while a guide groove for guiding the induction coil is formed on an outer surface of the insulating sleeve. The electrodeless discharge lamp according to claim 1, wherein is formed. The induction coil is formed by laminating inner and outer double coating layers having different melting points on the outer surface of a core wire having a circular cross section, and the outer coating layer having a lower melting point than the inner coating layer is The electrodeless discharge lamp according to claim 1, wherein the lamp is melted at a point after winding the induction coil on the outer surface of the ferrite core.

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