JP2003317673A - Electrodeless discharge lamp device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrodeless discharge lamp device in which temperature of the induction coil or magnetic core can be lowered while realizing manpower saving in the manufacturing process and which has high luminous efficiency and a long life. <P>SOLUTION: The electrodeless discharge lamp comprises an airtight container 1 filled with a discharge gas and a power coupler 3 that is inserted in the recessed cavity 2 of the airtight container 1. The power coupler 3 comprises an induction coil 8 that makes emit light by exciting the discharge gas by generating high frequency magnetic field as a result of impression of high frequency current and a core assembly in which a magnetic core 10 and a heat conductor 11 are mutually combined and then the induction core is wound. And each of the induction coil 10 and the heat conductor 11 is provided in a state mutually contacting closely with each of the above magnetic core, and each of the induction coil 8 and heat conductor 11 is provided without contacting each other. <P>COPYRIGHT: (C)2004,JPO

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 device, and more particularly to a structure of a power combiner provided in the electrodeless discharge lamp device.

[0002]

2. Description of the Related Art Conventionally, there is an illumination fixture called an electrodeless discharge lamp device, and examples thereof include JP-A-6-196006 and JP-A-11-501152.
There is one disclosed in the publication. That is, JP-A-6-
The electrodeless discharge lamp device disclosed in Japanese Patent Publication No. 196006,
An airtight container filled with a discharge gas and a power combiner housed in the cavity of the recess of the airtight container are provided.
The power coupler here is an induction coil that excites a discharge gas to emit light when a high-frequency electromagnetic field is generated by applying a high-frequency current, and a soft magnetic material that has a cylindrical shape and is wound around the induction coil. It has a magnetic core made of.

In the electrodeless discharge lamp device having such a structure, the induction coil and the magnetic core become extremely hot due to the influence of heat generated by the discharge or self-heating. When the induction coil, the magnetic core, and other insulators exceed the allowable operating temperature, the electrodeless discharge lamp device may not function normally or may have a short life.

For example, when the temperature of the magnetic core becomes high, it is inevitable that the magnetic flux is saturated and the lamp efficiency is lowered, or that the lamp is turned off because the lamp cannot be kept on. Therefore, in order to eliminate such an inconvenience, in the conventional form, a metal rod-shaped heat conductor is inserted into the magnetic core, and this heat conductor is used. The structure is used to dissipate heat to the outside.

In the power combiner of the electrodeless discharge lamp device disclosed in Japanese Patent Publication No. 11-501152, a plurality of heat conductors are arranged on the outer surface of the magnetic core, or the heat conductors are arranged. An assembly core is used in which a magnetic core is inserted in each of the plurality of through holes formed in the above. In this structure, the induction coil is wound around the heat conductor. With such a structure, the magnetic core and the heat conductor are in close contact with each other, and the heat exchange between them is favorable, and as a result, the electrodeless discharge disclosed in JP-A-6-196006 is obtained. It is possible to improve the performance with less labor required than the electric light device.

[0006]

By the way, the special table 11
In the electrodeless discharge lamp device disclosed in Japanese Patent Publication No. 5011152, the heat conductor and the induction coil are close to each other, and power loss occurs as eddy current flows through the heat conductor. As a result, the temperature of the conductor rises and the luminous efficiency decreases. In addition, in this case, the temperature of the induction coil also rises, which inevitably increases power loss and shortens the service life.

Further, when winding the induction coil, it is customary to use a winding frame (bobbin) made of synthetic resin or the like in order to easily wind the induction coil. However, the thermal conductivity of a synthetic resin is usually inferior to that of a metal, and since the generation of gaps due to the dimensional tolerances of the magnetic core and the bobbin is unavoidable, heat exchange is further hindered. I will end up.

The present invention has been made in view of the above-mentioned facts, and it is an object of the present invention to reduce the temperature of the induction coil and the magnetic core while realizing labor saving in the manufacturing process. In addition, it is another object of the present invention to provide an electrodeless discharge lamp device having high luminous efficiency and long service life.

[0009]

An electrodeless discharge lamp device according to a first aspect of the present invention comprises an airtight container filled with a discharge gas, and a power combiner inserted in a concave cavity of the airtight container. The power coupler includes an induction coil that excites the discharge gas to emit light by generation of a high-frequency electromagnetic field associated with application of a high-frequency current, a magnetic core and a heat conductor, and the induction coil. And an assembly core around which the coil is wound. The induction coil and the heat conductor are arranged in close contact with the magnetic cores, respectively, and the induction coil and the heat conductor are arranged in close contact with each other. Characterize.

In the electrodeless discharge lamp device according to the second aspect of the present invention, while the heat conductor has a polygonal shape in cross section,
The magnetic core is rectangular in cross section, and these magnetic cores are arranged in close contact with the outer surface of the heat conductor.

An electrodeless discharge lamp device according to a third aspect of the present invention is characterized in that a slit along the axial direction is formed in the heat conductor.

The electrodeless discharge lamp device according to a fourth aspect of the invention is characterized in that the corners of the magnetic core are arcuate or chamfered.

The electrodeless discharge lamp device according to a fifth aspect of the invention is characterized in that the guide groove of the induction coil is formed on the outer surface of the magnetic core.

An electrodeless discharge lamp device according to a sixth aspect of the present invention is characterized in that the magnetic cores are arranged so that the magnetic cores are in contact with each other.

According to a seventh aspect of the invention, there is provided an electrodeless discharge lamp device having a structure in which the magnetic core is inserted and fitted into the heat conductor, and the magnetic core and the heat conductor are tapered. It is characterized in that they are combined through the contact surface.

An electrodeless discharge lamp device according to an eighth aspect of the present invention is characterized in that an insulating film is formed on the outer surface of the magnetic core.

An electrodeless discharge lamp device according to a ninth aspect of the present invention is characterized in that unevenness is provided in a portion of the heat conductor that does not come into contact with the magnetic core.

In an electrodeless discharge lamp device according to a tenth aspect of the present invention, both ends of the magnetic core on which the induction coil is not wound are thickened in the diameter direction, and the end faces of the induction coil are wound. It is characterized in that it is projected to the outside of the outermost circumference.

According to the eleventh aspect of the invention, there is provided the electrodeless discharge lamp device, wherein the assembled core is housed in a winding frame, and the winding frame is provided with a connecting column portion located between the magnetic cores. It is characterized by

An electrodeless discharge lamp device according to a twelfth aspect of the present invention is characterized in that the induction coil is wound by edgewise winding.

An electrodeless discharge lamp device according to a thirteenth aspect of the present invention is characterized in that the induction coil is wound in multiple layers.

In the electrodeless discharge lamp device according to the fourteenth aspect of the present invention, the coil wire forming the induction coil is rectangular in cross section, and its long side portion is in contact with the magnetic core. It is characterized by being wound.

According to a fifteenth aspect of the invention, the electrodeless discharge lamp device is characterized in that the coil wire forming the induction coil has a hollow pipe shape.

The electrodeless discharge lamp device according to the sixteenth aspect of the present invention is characterized in that the heat conductor extends to the inner depth of the concave cavity.

According to a seventeenth aspect of the invention, the electrodeless discharge lamp device is characterized in that the insulating coating of the induction coil is thick on the high voltage side and thin on other than the high voltage side.

In the electrodeless discharge lamp device according to the eighteenth aspect of the present invention, the induction coil has a litz structure covered with an exterior coating having high heat resistance, and the coil wire has low heat resistance. It is characterized by being coated with an interior coating.

In the electrodeless discharge lamp device according to the nineteenth aspect of the present invention, the portion of the heat conductor in which the magnetic core is disposed is made of aluminum, and the other portions are made of copper. It is characterized by being

An electrodeless discharge lamp device according to a twentieth aspect of the present invention is characterized in that an exhaust thin tube disposing space having an elliptical cross section is formed in the heat conductor.

In the electrodeless discharge lamp device according to the twenty-first aspect of the present invention, a metal cylinder is arranged around the outer circumference of the induction coil wound around the assembly core, and the metal cylinder has an axial direction. It is characterized in that a slit is formed along.

[0030]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the drawings according to the embodiments.

FIG. 1 is an explanatory view showing the overall structure of the electrodeless discharge lamp device according to the first to eighth embodiments, and FIG. 2 is a main part structure of the electrodeless discharge lamp device according to the first embodiment. ,
It is explanatory drawing which shows the planar structure cut | disconnected by the cutting plane line XX in FIG. 1, and each of FIG. 3 and FIG. 4 is explanatory drawing which shows a modification. FIG. 5 is an explanatory diagram showing a main part structure of the electrodeless discharge lamp device according to the second embodiment, and FIGS. 6 and 7 are explanatory diagrams showing modified examples.

FIG. 8 is an explanatory view showing the structure of the main parts of the electrodeless discharge lamp device according to the third embodiment, and FIG. 9 shows the structure of the main parts of the electrodeless discharge lamp device according to the fourth embodiment. FIG. On the other hand, FIG. 10 is an explanatory view showing the main structure of the electrodeless discharge lamp device according to the fifth embodiment, and FIGS.
2 is an explanatory view showing a main part structure of an electrodeless discharge lamp device according to a sixth embodiment.

Further, FIG. 13 is an explanatory view showing the main structure of the electrodeless discharge lamp device according to the seventh embodiment, and FIGS.
Each of FIG. 16 is an explanatory view showing the main structure of the electrodeless discharge lamp device according to the eighth embodiment. Furthermore, FIG.
Is an explanatory view showing the overall structure of the electrodeless discharge lamp device according to the ninth embodiment, FIG. 18 is an explanatory diagram showing the overall structure of the electrodeless discharge lamp device according to the tenth embodiment, and FIG. It is explanatory drawing which shows the principal part structure of the electrodeless discharge lamp device which concerns on the form 10. [First Embodiment] As shown in FIG. 1, an electrodeless discharge lamp device according to a first embodiment is provided with an airtight container 1 made of a translucent material in which a discharge gas is sealed, and the airtight container 1. The concave cavity 2 and the power combiner 3 inserted into the concave cavity. That is, the airtight container 1
A rare gas such as argon or krypton and mercury are enclosed as a discharge gas therein, and a phosphor film 4 and a protective film 5 are applied on the inner surface thereof. The phosphor coating 4, the protective coating 5, and the reflective coating 6 are also applied to the inner surface of the concave cavity 2.

In the electrodeless discharge lamp device, the airtight container 1 and the concave cavity 2 are sealed at the bottom of the envelope,
Moreover, the exhaust thin tube 7 has a discharge space sealed at the upper part of the concave cavity 2, and the discharge gas is also sealed in this discharge space. Further, in this case, the power coupler 3 causes the induction coil 8 to excite the discharge gas to emit light by generating a high-frequency electromagnetic field accompanying the application of the high-frequency current.
And an assembly core around which the induction coil 8 is wound. The assembly core is a combination of a magnetic core 10 and a heat conductor 11.

The heat conductor 11 here is a hollow pipe-shaped metal cylinder, for example, a metal cylinder made of aluminum, and the heat conductor 11 serves as a support member for fixing the power coupler 3 to the lamp base 12. Is also supposed to work. Then, an exhaust thin tube 7 is inserted in a through hole having a circular cross section formed at the axial center position of the heat conductor 11, that is, an exhaust thin tube disposing space, and inside the exhaust thin tube 7, An amalgam 13 for controlling the vapor pressure of mercury,
A glass rod 14 for fixing the position of the amalgam 13 is provided.

The heat conductor 11 of the assembly core 9 included in the power combiner 3 according to the present embodiment has a quadrangular shape in cross section as shown in FIG. A magnetic core 10 made of ferrite or the like and having a rectangular shape in cross section is disposed in close contact with each surface, that is, each of the outer surfaces. Therefore, the induction coil 8 in this case
Since the magnetic cores 10 are interposed, the magnetic core 10 is not in close contact with the heat conductor 11 and is wound along each of the magnetic cores 10. The cross-sectional shape of the heat conductor 11 is not limited to the quadrangular shape, but may be a polygonal shape such as a hexagonal shape.

In general, the electromagnetic generating portion of the power combiner 3 receives radiant heat from the discharge space and is affected by heat loss due to resistance loss of the current flowing through the induction coil 8 and loss of the magnetic core 10. It becomes very hot. When the temperature of the magnetic core 10 becomes high, the efficiency of the lamp is lowered due to the magnetic flux saturation, and the lighting of the lamp cannot be maintained. However, in order to avoid such inconvenience, the magnetic core 10
It is necessary to prevent an increase in the temperature and reduce the temperature.

At this time, if the heat conductor 11 on which the magnetic core 10 is arranged is a long metal cylinder having a circular cross section, it is unavoidable that the manufacture is difficult. When the conductor 11 is a metal cylinder as a long object having a polygonal shape in cross section, it is easy to manufacture and the cost can be reduced. In the power combiner 3 having such a configuration, the contact state between the magnetic core 10 and the heat conductor 11 is improved, and as a result, the temperature decrease of the magnetic core 10 is promoted.

Further, in this case, as shown in FIG. 2 (B), the corner portions of the heat conductor 11 having a quadrangular shape in cross section are to be expanded, and these corner portions are also expanded. The part may be in contact with the side surface of the magnetic core 10.
If a metal is arranged near the induction coil 8,
Since the loss increases, the bulges at the corners of the heat conductor 11 are set so as not to reach the vicinity of the induction coil 8.

In this way, the heat conductor 11 is formed into a polygonal shape in cross section, the corners are widened, and the magnetic cores 10 each having a rectangular cross section are arranged in close contact with each other on each surface thereof. When the induction coil 8 is wound along the outer periphery, the radiant heat received from the discharge space and the heat generated in the induction coil 8 and the magnetic core 10 can be efficiently radiated from the heat conductor 11. . That is, if the bulging shape of the corners of the heat conductor 11 is set to be the remaining shape obtained by cutting a fan-shaped portion from a triangle or a square, the loss caused by the presence of the metal in the vicinity of the induction coil 8 is lost. The temperature of the magnetic core 10 can be lowered while suppressing the above.

By the way, as shown in FIGS. 3 (A) and 3 (B), a slit 16 for suppressing the generation of eddy currents should be formed in the heat conductor 11 having a polygonal cross section. Is preferred. That is, in the heat conductor 11, an eddy current is generated in response to the magnetic field from the induction coil 8, and heat is generated due to the eddy current. As a result, the heat dissipation efficiency may be reduced. However, as shown in FIG. 3 (A), a large number of metal plates are laminated, and the slit 16 is provided between the metal plates.
In the case where the heat conductor 11 is present, the slits 16 suppress the generation of eddy currents,
It is unlikely that the heat dissipation efficiency of the heat conductor 11 is lowered.

Although the heat conductor 11 is formed by laminating a large number of metal plates here, the present invention is not limited to such a structure, and as shown in FIG. 3 (B). The slit 16 may be formed only in part of the heat conductor 11. That is, even if only the slit 16 is formed in a part of the heat conductor 11, as a result of suppressing the generation of the eddy current, the heat dissipation efficiency of the heat conductor 11 is less likely to decrease.

Furthermore, as shown in FIGS. 4A and 4B, the corners of the magnetic cores 10 arranged in close contact with the respective surfaces of the heat conductor 11 having a quadrangular shape in cross section. Chamfer the part,
It may be curved in an arc shape. That is, the corners of the magnetic core 10 where the electric field and the magnetic field are likely to concentrate are likely to cause dielectric breakdown in the induction coil 8. However, if the corner cutting of each corner of the magnetic core 10 is performed in advance. It is possible to prevent dielectric breakdown due to concentration of electric field or magnetic field. [Second Embodiment] An electrodeless discharge lamp device according to a second embodiment includes an airtight container 1, a concave cavity 2, and a power combiner 3 as in the case of the first embodiment. 3 includes an induction coil 8 and an assembly core. The induction coil 8 is wound around this assembly core, and is composed of four magnetic cores 10 and heat conductors 11 combined with each other.

That is, the heat conductor 11 here has a quadrangular shape in cross section, and each of the magnetic cores 10 has a rectangular shape in cross section and is arranged in close contact with each surface of the heat conductor 11. The induction coil 8 is wound around the outer circumference of the magnetic core 10. And at this time, each magnetic core 1
As shown in the front view of FIG. 5 (A) and the side view of FIG. 5 (B), the outer surface of 0 has a guide groove 18 for winding the coil wire of the induction coil 8. Has been formed.
With such a structure, the induction coil 8 can be easily wound around the outer periphery of the magnetic core 10.

As shown in FIG. 6 (A), each of the magnetic cores 10 having a rectangular cross-section has a state in which the long side portion and the short side portion of the adjacent magnetic cores 10 are in contact with each other. Is preferably provided. With such a structure, each magnetic core 1
It is possible to reliably bring the magnetic core 10 and the heat conductor 11 into close contact with each other even if the dimensional error occurs in the zero or the heat conductor 11. Therefore, the temperature rise of the induction coil 8 and the magnetic core 10 is suppressed, and these temperatures are lowered.
Further, at this time, the sectional view shape of each magnetic core 10 is shown in FIG.
In addition to having a hook shape as shown in (B), that is, a V-shaped cross section, the hook-shaped magnetic cores 10 are arranged in close contact with the corners of the heat conductor 11. May be.

Furthermore, the magnetic core 10 may have a structure in which the magnetic core 10 is inserted and fitted into the heat conductor 11. In such a case, as shown in FIG. It is preferable that the body 11 and the body 11 are combined via a tapered contact surface. That is, in the structure shown in FIG. 7, a so-called dovetail-shaped fitting recess is formed on each surface of the heat conductor 11, and each of the magnetic cores 10 faces downward with respect to each fitting recess. It is performed by plugging in.

Then, each of the magnetic cores 10 and the heat conductor 1
1 and 1 are combined via a tapered contact surface,
If the magnetic cores 1 are integrated with each other,
0 and the degree of adhesion between the heat conductor 11 are increased, and the heat generated in the induction coil 8 and the magnetic core 10 is reliably generated.
Will be effectively dissipated. In this structure, even if there is a dimensional error between the fitting recess of the heat conductor 11 and each magnetic core 10, each magnetic core 10 only protrudes from the upper end of the heat conductor 11, and the dimensional error. The advantage of being easy to deal with is secured. [Third Embodiment] An electrodeless discharge lamp device according to a third embodiment includes an airtight container 1, a concave cavity 2, and a power coupler 3 as in the first embodiment. The power combiner 3 includes an induction coil 8 and an assembly core, and the assembly core around which the induction coil 8 is wound includes a heat conductor 11 having a rectangular cross section and a rectangular cross section. And four magnetic cores 10 arranged in close contact with the respective surfaces of the heat conductor 11.

That is, in the power combiner 3 of the electrodeless discharge lamp device having a relatively low lighting frequency of about 150 KHz, many magnetic cores 10 made of Mn-Zn ferrite for low frequency are usually used. The -Zn ferrite magnetic core 10 has electrical conductivity and needs to be electrically insulated from the induction coil 8. However, since a high voltage exceeding 1 KVo-p is applied to the induction coil 8 at the time of starting, the insulation coating of the coil wire forming the induction coil 8 has a sufficient thickness to insulate the high voltage. Is done.

In addition, in the induction coil 8, loss occurs due to iron loss or copper loss of the magnetic core 10 and heat generation of the coil wire. Therefore, in order to reduce such loss, it is necessary to increase the Q value. It is necessary to wind the coil wire in as close a state as possible. However, in order to maintain the electrical insulation of the induction coil 8 and the magnetic core 10, when the insulating coating of the coil wire forming the induction coil 8 is made sufficiently thick,
As a result of increasing the spacing between the coil wires, the Q value becomes low.

Therefore, in the electrodeless discharge lamp device according to the present embodiment, as shown in FIG. 8, the insulating layer 20 is formed on the surface of the magnetic core 10 and the surface of the magnetic core 10 is covered by the insulating layer 20. While thinning the insulation coating 21 on the coil wire of the induction coil 8 wound around the magnetic core 10, the insulation coating 21 is thinned. With such a structure, the insulating coating 21 of the induction coil 8 can be thinned as the surface of the magnetic core 10 is coated with the insulating layer 20, and the distance L between the coil wires can be shortened. Therefore, as a result of the induction coil 8 having a high Q value being configured, it is possible to withstand a high voltage at the time of starting.

By the way, it is general to use polyester, Teflon (registered trademark) or the like as the insulating coating of the coil wire constituting the induction coil 8, but instead of these, a material having good thermal conductivity. It is preferable to use, for example, silicon. That is, when silicon having good thermal conductivity is used as the insulating coating of the coil wire, the heat generated in the induction coil 8 is easily transmitted to the magnetic core 10 and the heat conductor 11, and the temperature of the induction coil 8 is lowered. It becomes possible. [Fourth Embodiment] The electrodeless discharge lamp device according to the fourth embodiment includes an airtight container 1, a concave cavity 2, and a power coupler 3 as in the first embodiment. The power combiner 3 includes an induction coil 8 and an assembly core in which the magnetic core 10 and the heat conductor 11 are combined. Then, in a portion of the heat conductor 11 having a rectangular shape in cross section in which the magnetic core 10 having a rectangular shape in cross section is arranged in close contact with the magnetic core 10, the unevenness 23 as shown in FIG. Are provided respectively. In order to make it easier to wind the induction coil 8, the outer surface of each magnetic core 10 is curved outward, and the unevenness 23 of the heat conductor 11 is projected along the radial direction of the induction coil 8. Has been.

That is, in the configuration according to the present embodiment,
Heat conductor 11 in recess cavity 2 of airtight container 1
Since the unevenness 23 is provided in the portion that does not contact the magnetic core 10, the contact area of the heat conductor 11 with air increases. Therefore, without using another additional member,
The effect of reducing the eddy current loss of the induction coil 8 is added, and the temperature of the heat conductor 11 is lowered. As a result, it is possible to configure an inexpensive electrodeless discharge lamp device having excellent heat resistance. .

In FIG. 9A, the concave cavity 2
Although the unevenness 23 is provided on the heat conductor 11 in the inside, the structure is not limited to such a structure, and the magnetic core 10 of the heat conductor 11 is arranged as shown in FIG. 9B. It is needless to say that the unevenness 23 may be provided on the non-existing portion, in other words, the protruding portion of the heat conductor 11 protruding from the magnetic core 10. In the case of such a structure, since the area where the induction coil 8 and the heat conductor 11 are close to each other is reduced, the eddy current generated in the heat conductor 11 by the action of the high frequency current flowing through the induction coil 8 is reduced. Will be small. [Fifth Embodiment] An electrodeless discharge lamp device according to a fifth embodiment includes an airtight container 1, a concave cavity 2, and a power combiner 3 as in the case of the first embodiment. 3 includes an induction coil 8 and an assembly core around which the induction coil 8 is wound, that is, an assembly core formed by combining four magnetic cores 10 and a heat conductor 11.
Then, as shown in FIG. 10 (B), both ends of the magnetic core 10 on which the induction coil 8 is not wound are thickened in the diametrical direction, and the end faces thereof are more than the outermost circumference of the wound induction coil 8. Is also projected to the outside.

That is, in the magnetic core 10 which is only formed into a rectangular shape in a normal sectional view, the magnetic flux 25 is concentrated on the edge portion as shown in FIG. With the magnetic core 10 configured as described above,
Since the magnetic saturation due to the concentration of the magnetic flux 25 does not occur, the loss is reduced. If the protruding portion of the magnetic core 10 at this time is extended to the outside of the induction coil 8, it is also possible to reduce the ratio of the magnetic flux that exits the magnetic core 10 and intersects with the induction coil 8. Become. [Sixth Embodiment] An electrodeless discharge lamp device according to a sixth embodiment includes an airtight container 1, a concave cavity 2 and a power coupler 3 as in the first embodiment. 3 comprises an induction coil 8 and an assembly core. The assembled core here includes not only the magnetic core 10 and the heat conductor 11 but also a winding frame (bobbin) 27 having a configuration as shown in FIG.

That is, in the magnetic core 10 and the heat conductor 11 constituting the power combiner 3 of the electrodeless discharge lamp device according to the present embodiment, the upper end portion 27a and the lower end portion 27b are connected to the supporting column portion 2.
8 are supported in parallel with each other, and these connecting support columns 2
The induction coils 8 are housed in a winding frame 27 having openings between them, and the induction coil 8 is wound along the winding frame 27. Then, at this time, as shown in FIG. 12, each of the connecting column portions 28 of the winding frame 27 is arranged in close contact with each surface of the heat conductor 11 having a rectangular shape in a sectional view, and the rectangular shape in a sectional view. It is located between the magnetic cores 10 having a shape, that is, between the magnetic cores 10.

By the way, it is a well-known fact that a winding frame is used to facilitate the winding of the induction coil 8.
If the general winding frame is simply used, the heat radiation from the induction coil 8 or the magnetic core 10 to the heat conductor 11 is likely to be hindered. However, as described above, when each of the magnetic cores 10 arranged in close contact with the heat conductor 11 is exposed from between the connecting column portions 28 of the winding frame 27, the magnetic cores 10 are Since the induction coil 8 is also wound around, the heat radiation from the induction coil 8 and the magnetic core 10 to the heat conductor 11 is not hindered.

Therefore, if such a structure is adopted, there is an advantage that the induction coil 8 can be easily wound while reducing the thermal resistance between the magnetic core 10 and the heat conductor 11. Secured. As the assembling procedure at this time, first, the induction coil 8 is wound around the winding frame 27, and the magnetic core 10 is inserted from the opening of the upper end portion 27a or the lower end portion 27b of the winding frame 27, respectively, and the connecting column 28 is connected.
After arranging between them, the heat conductor 11 is inserted and arranged between the magnetic cores 10 through the opening of the upper end 27a or the lower end 27b of the winding frame 27. [Embodiment 7] An electrodeless discharge lamp device according to Embodiment 7 includes an airtight container 1, a concave cavity 2 and a power combiner 3 as in the case of the first embodiment. The reference numeral 3 includes an induction coil 8 and an assembly core around which the induction coil 8 is wound, that is, an assembly core formed by combining four magnetic cores 10 and a heat conductor 11. Then, as shown in FIG. 13 (A), the induction coil 8 at this time is wound around the magnetic core 10 as edgewise winding, and the entire length of the magnetic core 10 corresponds to the edgewise winding of the induction coil 8. Only shorter than usual.

That is, the induction coil 8 is composed of a coil element wire having an elliptical cross-section, and is wound along the magnetic core 10 by adopting a winding method in which the wide surfaces thereof face each other, so-called edgewise winding. It is wound. With such edgewise winding, the occupancy rate of the coil wire becomes large as compared with the usual winding method, and the induction coil 8 is downsized. Also, because the winding size is shorter than usual,
Not only the iron loss due to the proximity effect due to the leakage magnetic flux is reduced, but also the winding size of the induction coil 8 is short, so that the total length of the magnetic core 10 is shortened and the volume is reduced. As a result, the iron loss can be further reduced. Become.

Although the induction coil 8 is edgewise wound around the magnetic core 10 here, as shown in FIG. 13B, the induction coil 8 is wound in a multi-layer winding only around the central portion of the magnetic core 10. Of course, it can be turned. Even in the case of such a multi-layer winding, the winding size of the induction coil 8 is shorter than that of a normal single-layer winding, so that the magnetic flux density is increased and the leakage magnetic flux is reduced, so that the induction coil 8 is wound. Also, the temperature rise of the magnetic core 10 is suppressed.

To reduce the leakage flux, the magnetic core 1
It is important to make the winding size of the induction coil 8 smaller than the size of 0, and when the induction coil 8 is wound over the entire length of the magnetic core 10, a leakage magnetic flux is generated at the end of the magnetic core 10. That is, the end of the magnetic core 10 needs to have a certain length to the extent that the induction coil 8 is not wound, and the longer this length, the smaller the leakage flux. Therefore, when the number of turns of the induction coil 8 is set to be the same as the number of turns of one layer only in the central portion of the magnetic core 10, and the induction coil 8 is wound in multiple layers, the induction coil 8 is wound at the end of the magnetic core 10. Since the length of the unfilled portion is increased, the leakage magnetic flux is reduced and the loss due to the leakage magnetic flux is reduced.

By the way, in FIG. 13A, the induction coil 8 is assumed to be composed of an elliptical coil wire in cross section, but the coil wire forming this induction coil 8 is rectangular in cross section. It may be shaped. In such a case, although not shown, the induction coil 8 is wound while the long side portions of the coil wire are in contact with the magnetic cores 10, respectively.

Further, at this time, the coil wire of the induction coil 8 may be formed in a hollow pipe shape, and air or a gas having excellent thermal conductivity, for example, helium gas may be enclosed therein. That is, the current flowing through the induction coil 8 is a high frequency current, and although the current density on the coil surface increases due to the skin effect, the high frequency current does not flow through the center of the coil. Therefore, regardless of whether or not the coil wire has a hollow pipe shape, the copper loss of the coil wire is almost the same, and when the coil wire has a hollow pipe shape, the surface area becomes large and the heat dissipation effect is increased. As a result, the temperature drop of the induction coil 8 is promoted.

Furthermore, as shown in FIGS. 13 (A) and 13 (B), the heat conductor 11 in which the magnetic core 10 is closely attached protrudes from the upper end of the magnetic core 10 and has an airtight container. It is preferable that the recessed cavity 2 provided in the reference numeral 1 extends to the inner depth. With such a configuration, the heat conductor 11 extends to the inner depth of the concave cavity 2 of the airtight container 1, so that the heat conductor 11 efficiently receives the radiant heat received from the discharge space. The advantage that heat can be dissipated is ensured. [Embodiment 8] An electrodeless discharge lamp device according to Embodiment 8 includes an airtight container 1, a concave cavity 2 and a power combiner 3 as in the case of the first embodiment. 3 includes an induction coil 8 and an assembly core around which the induction coil 8 is wound, that is, an assembly core formed by combining four magnetic cores 10 and a heat conductor 11.
Then, as shown in FIG. 14, the insulating coating of the induction coil 8 at this time is thicker on the higher voltage side, that is, on one end (the upper end in the figure) to which a high voltage is applied, and
The other end (the lower end in the figure) to be grounded, that is, the other end other than the high voltage side is made thinner.

That is, in a low-frequency electrodeless discharge lamp device, an Mn-based magnetic core 10 having a relatively high magnetic permeability is often used as the magnetic core 10. However, since the Mn-based magnetic core 10 has conductivity, the induction coil is used. It is necessary to secure the withstand voltage of the magnetic core 8 and the magnetic core 10. Therefore, the thickness of the insulating coating of the coil wire is generally determined so as to match the maximum voltage value applied to the induction coil 8. What is the thickness of the insulating coating of the coil wire? Are considered to be equivalent.

However, in the case of the structure according to the present embodiment, since the insulating coating of the coil wire is thin at the place where the voltage is low, the induction coil 8 can be wound tightly, resulting in that It is possible to improve the efficiency while reducing the leakage magnetic flux. On the other hand, in the power combiner 3 of the electrodeless discharge lamp device according to the present embodiment, the thickness of the insulating coating of the induction coil 8 is locally changed, and the insulating coating of a portion that does not require a withstand voltage is thin. Therefore, the leakage magnetic flux is reduced and the Q value is increased.

If the power coupler 3 at this time is provided with the sleeve 29 for maintaining the electrical insulation between the induction coil 8 and the magnetic core 10, as shown in FIG. The one end portion (upper end portion in the figure) of the sleeve 29 located on the higher voltage side of the induction coil 8 is made thicker, and the other end portion (lower end portion in the figure) of the sleeve 29 located on the other side than the high voltage side of the induction coil 8 is formed. You may make thickness thin. Although the sleeve 29 has a tapered shape in FIG. 15, it is not limited to such a shape, and it goes without saying that the sleeve 29 may have different thicknesses via a step.

By the way, when the lighting frequency of the electrodeless discharge lamp device is about 150 KHz, the litz wire 31 as shown in FIG. 16, that is, a large number of strands insulated with the low heat resistant interior coating 32 is used. It is also possible to configure the induction coil 8 with the litz wire 31 in which the conductors 33 are twisted with each other, and to insulate the entire circumference of the litz wire 31 with a highly heat resistant exterior coating 34.

At this time, the polyurethane (UEW) having thermoplasticity is used as the inner coating 32,
Teflon (registered trademark) type FEP etc. exterior coating 3
4 is used. At this time, the inner coating 32 of the wire conductor 33 does not have heat resistance at 200 ° C. or higher, but the outer coating 34 of the litz wire 31 has a heat resistance of 200 or more.
Since it has heat resistance even at a high temperature of 0 ° C. or higher, the outer coating 34 does not deteriorate even if it receives radiant heat from the discharge space, and the Litz structure is not damaged. [Ninth Embodiment] An electrodeless discharge lamp device according to a ninth embodiment includes an airtight container 1, a concave cavity 2, and a power coupler 3 as shown in the overall structure in FIG. The power combiner 3 includes an induction coil 8 and an assembly core. The assembly core around which the induction coil 8 is wound is not shown in the drawing, but is a heat conductor having a rectangular cross-section. 1
1 and four magnetic cores 10 that are rectangular in cross section and are arranged in close contact with the respective surfaces of the heat conductor 11. In FIG. 17, reference numeral 4 is a phosphor film, 5 is a protective film, 6 is a reflective film, and 7 is an exhaust thin tube 7.

Further, the heat conductor 11 at this time is a hollow pipe-shaped metal cylinder which also functions as a support member for fixing the power coupler 3 to the lamp base 12, and the magnetic core 10
The part that is placed in close contact (the upper part in the figure)
11a is made of aluminum, and the other part (lower part in the figure) 11b is made of copper. In other words, here
A portion 11b of the heat conductor 11 on which the magnetic core 10 is not provided is made of copper, and this heat conductor 11 is made of copper 11.
It is connected to the lamp base 12 with b.

That is, copper has good thermal conductivity and is suitable for a heat dissipation member, but complicated processing is difficult. Therefore, for the portion 11a where the magnetic core 10 is disposed in the heat conductor 11, aluminum that is easy to process is used, and for the portion that does not require complicated processing, that is, the portion 11b where the magnetic core 10 is not disposed, copper is used. By using, it is possible to improve workability while ensuring good heat dissipation. In addition, such a copper-made part 11b may be comprised by the copper pipe marketed.

By the way, at the axial center position of the heat conductor 11, a through-hole having a circular shape in cross section in which the exhaust pipe 7 is inserted, that is,
Although the exhaust thin tube disposing space is formed, although not shown in the drawing, the cross sectional shape of this exhaust thin tube disposing space may be elliptical. That is, when constructing the electrodeless discharge lamp device, connecting the exhaust pipe 7 which is a hollow pipe having good linearity to the upper part of the concave cavity 2 is performed, but at the time of connection, , The exhaust thin tube 7 in one direction with the upper portion of the concave cavity 2 as a fulcrum.
May tilt and be displaced. In such a case, it cannot be dealt with as long as the cross-sectional shape of the exhaust thin pipe disposing space is circular, but if the cross-sectional shape is elliptical, the advantage that it can be easily dealt with is secured. [Embodiment 10] The electrodeless discharge lamp device according to Embodiment 10 has an airtight container 1 as shown in FIG.
And a recess cavity 2 and a power combiner 3. The power combiner 3 includes an induction coil 8 and an assembly core. The assembly core around which the induction coil 8 is wound is not shown in the drawing, but is a heat conductor having a rectangular cross-section. 11 and four magnetic cores 10 which are rectangular in cross section and which are arranged in close contact with the respective surfaces of the heat conductor 11. Reference numeral 4 in FIG. 18 is a phosphor film,
5 is a protective film, 6 is a reflective film, 7 is an exhaust thin tube 7,
12 is a lamp stand.

Further, in this case, a cylindrical metal tube is provided around the power coupler 3, that is, the induction coil 8 wound around the magnetic core 10 arranged in close contact with the heat conductor 11. 36 is provided, and the metal cylinder 36 is electrically and thermally connected to the heat conductor 11. And FIG.
As shown by 9, a slit 37 having a predetermined width is formed in the metal cylinder 36 along the axial direction, and the slit 37 reduces the eddy current generated in the metal cylinder 36. ing.

With such a structure, the heat from the lamp is radiated through the metal tube 36, and the temperature of the induction coil 8 and the magnetic core 10 can be lowered. Furthermore, the metal cylinder 36 here is the induction coil 8
Since it also has the effect of blocking the strong electric field generated in step 2, it is possible to reduce the damage to the phosphor film 4 due to the plasma generated while the lamp is lit, and it is possible to improve the luminous flux maintenance factor. In addition, a part of the high-voltage side of the induction coil 8 is connected to the metal cylinder 36.
When it is arranged outside of, it is possible to improve the startability.

[0074]

In the electrodeless discharge lamp device according to the first aspect of the present invention, the induction coil and the heat conductor are arranged in close contact with the respective magnetic cores, while the induction coil and the heat conductor are Since they are placed in close contact with each other, it is possible to reduce the temperature of the induction coil and magnetic core while realizing labor saving in the manufacturing process, and to increase the luminous efficiency and prolong the service life. The effect of being able to do is obtained.

In the electrodeless discharge lamp device according to the second aspect of the present invention, the heat conductor has a polygonal shape in cross section, while the magnetic core has a rectangular shape in cross section, and these magnetic cores are heat conductors. Since it is arranged in close contact with the outer surface of the magnetic core, the contact state between the magnetic core and the heat conductor is improved, and as a result, the effect of accelerating the temperature decrease of the magnetic core is obtained.

In the electrodeless discharge lamp device according to the third aspect of the present invention, since the slits along the axial direction are formed in the heat conductor, the slits suppress the generation of eddy currents, resulting in heat conduction. It is possible to obtain the effect that it is less likely to cause a decrease in heat dissipation efficiency in the body.

In the electrodeless discharge lamp device according to the fourth aspect of the present invention, since the corners of the magnetic core are arcuate or chamfered, it is possible to prevent dielectric breakdown due to concentration of an electric field or a magnetic field. The effect that it becomes possible is obtained.

In the electrodeless discharge lamp device according to the fifth aspect of the present invention, since the guide groove of the induction coil is formed on the outer surface of the magnetic core, the induction coil is wound along the outer periphery of the magnetic core. The effect is that it becomes easier.

In the electrodeless discharge lamp device according to the sixth aspect of the present invention, since the magnetic cores are arranged so as to be in contact with each other, the temperature rise of the induction coil and the magnetic core is suppressed. Therefore, the effect of facilitating lowering of these temperatures can be obtained.

In the electrodeless discharge lamp device according to the invention of claim 7, the magnetic core is inserted into the heat conductor and fitted therein, and the magnetic core and the heat conductor are tapered. Since they are combined via the contact surface, the degree of adhesion between the magnetic core and the heat conductor is increased, and the heat generated in the induction coil and the magnetic core is surely transmitted to the heat conductor and effectively radiated. The effect is obtained.

In the electrodeless discharge lamp device according to the eighth aspect of the present invention, since the insulating film is formed on the outer surface of the magnetic core,
The insulating coating of the induction coil can be thinned. Therefore, the distance between the coil wires is shortened, and as a result of the induction coil having a high Q value being constructed, it is possible to withstand the high voltage at the time of starting.

In the electrodeless discharge lamp device according to the ninth aspect of the present invention, since the unevenness is provided in the portion of the heat conductor that does not contact the magnetic core, the contact area of the heat conductor with air increases. The effect that the temperature of the heat conductor can be lowered is obtained.

In the electrodeless discharge lamp device according to the tenth aspect of the present invention, both ends of the magnetic core induction coil on which the induction coil is not wound are made thicker in the diameter direction, and the end faces of the electrode coil from the outermost circumference of the induction coil are wound. Since the magnetic field is also projected to the outside, the saturation of the magnetic field due to the concentration of the magnetic flux does not occur and the effect of reducing the loss can be obtained.

According to the eleventh aspect of the electrodeless discharge lamp device of the present invention, the assembled core is housed in the winding frame, and the winding frame is provided with the connecting column portion located between the magnetic cores. Therefore, there is an effect that the induction coil can be easily wound while reducing the thermal resistance between the magnetic core and the heat conductor.

In the electrodeless discharge lamp device according to the twelfth aspect of the present invention, since the induction coil is wound by edgewise winding, the occupancy ratio of the coil wire becomes large as compared with the normal winding method, and the induction coil is wound. The coil is downsized. Further, not only the iron loss due to the proximity effect due to the leakage magnetic flux is reduced, but also the total length of the magnetic core is shortened and the volume is reduced. As a result, the iron loss can be further reduced.

In the electrodeless discharge lamp device according to the thirteenth aspect of the invention, the induction coil is wound in multiple layers, and in the electrodeless discharge lamp device according to the fourteenth aspect of the invention, The coil wire has a rectangular shape in cross section and is wound such that its long side portion is in contact with the magnetic core. Therefore, the same effect as the invention according to claim 12 is obtained.

In the electrodeless discharge lamp device according to the fifteenth aspect of the present invention, since the coil wire forming the induction coil has a hollow pipe shape, the surface area is increased and the heat dissipation effect is increased. The effect of accelerating the temperature decrease of is obtained.

In the electrodeless discharge lamp device according to the sixteenth aspect of the present invention, since the heat conductor extends to the inner depth of the concave cavity, the heat conductor receives the radiant heat received from the discharge space. The effect that heat can be efficiently dissipated is obtained.

In the electrodeless discharge lamp device according to the invention of claim 17, the insulating coating of the induction coil is thickened on the high voltage side,
Since it is thin on the side other than the high voltage side, the induction coil can be wound tightly, and as a result, it is possible to reduce leakage flux and improve efficiency.

In the electrodeless discharge lamp device according to the eighteenth aspect of the present invention, the induction coil has a litz structure covered with an exterior coating having high heat resistance, and the coil wire is an interior coating having low heat resistance. Since it is coated with, the effect that the heat resistance of the induction coil can be improved as a whole is obtained.

In the electrodeless discharge lamp device according to the nineteenth aspect of the present invention, the portion of the heat conductor in which the magnetic core is arranged is made of aluminum, and the other portions are made of copper. It is possible to obtain an effect that workability can be improved while ensuring sufficient heat dissipation.

In the electrodeless discharge lamp device according to the twentieth aspect of the present invention, the heat conductor is provided with the exhaust thin tube disposing space having an elliptical cross section, so that the displacement of the exhaust thin tube can be easily dealt with. The effect that can be obtained is obtained.

In the electrodeless discharge lamp device according to the twenty-first aspect of the present invention, the metal cylinder is arranged around the outer periphery of the induction coil wound around the assembly core, and the metal cylinder is arranged in the axial direction. Since the slit is formed along the line, the temperature of the induction coil and the magnetic core can be lowered. In addition, since the metal cylinder has a function of blocking a strong electric field generated in the induction coil, it is possible to reduce damage to the phosphor coating to improve the luminous flux maintenance factor and improve startability. can get.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an overall structure of an electrodeless discharge lamp device according to first to eighth embodiments.

FIG. 2 is an explanatory diagram showing a main part structure of the electrodeless discharge lamp device according to the first embodiment, that is, a planar structure cut along a cutting line XX in FIG.

FIG. 3 is an explanatory diagram showing a modification of the electrodeless discharge lamp device according to the first embodiment.

FIG. 4 is an explanatory diagram showing a modified example of the electrodeless discharge lamp device according to the first embodiment.

FIG. 5 is an explanatory diagram showing a main structure of an electrodeless discharge lamp device according to a second embodiment.

FIG. 6 is an explanatory diagram showing a modified example of the electrodeless discharge lamp device according to the second embodiment.

FIG. 7 is an explanatory diagram showing a modified example of the electrodeless discharge lamp device according to the second embodiment.

FIG. 8 is an explanatory diagram showing a main part structure of an electrodeless discharge lamp device according to a third embodiment.

FIG. 9 is an explanatory diagram showing a main structure of an electrodeless discharge lamp device according to a fourth embodiment.

FIG. 10 is an explanatory diagram showing a main part structure of an electrodeless discharge lamp device according to a fifth embodiment.

FIG. 11 is an explanatory diagram showing a main part structure of an electrodeless discharge lamp device according to a sixth embodiment.

FIG. 12 is an explanatory diagram showing a main part structure of an electrodeless discharge lamp device according to a sixth embodiment.

FIG. 13 is an explanatory diagram showing a main structure of an electrodeless discharge lamp device according to a seventh embodiment.

FIG. 14 is an explanatory diagram showing a main structure of an electrodeless discharge lamp device according to an eighth embodiment.

FIG. 15 is an explanatory diagram showing a main part structure of an electrodeless discharge lamp device according to an eighth embodiment.

FIG. 16 is an explanatory diagram showing a main structure of an electrodeless discharge lamp device according to an eighth embodiment.

FIG. 17 is an explanatory diagram showing the overall structure of the electrodeless discharge lamp device according to the ninth embodiment.

FIG. 18 is an explanatory diagram showing the overall structure of the electrodeless discharge lamp device according to the tenth embodiment.

FIG. 19 is an explanatory diagram showing a main structure of an electrodeless discharge lamp device according to a tenth embodiment.

[Explanation of symbols]

1 airtight container 2 concave cavity 3 Power combiner 8 induction coil 10 magnetic core 11 Thermal conductor 16 slits 18 guide groove 20 Insulation film 23 unevenness 27 reels 28 Connection column 36 metal tube 37 slits

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Taishi Okamoto             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company (72) Inventor Koji Hiramatsu             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company (72) Inventor Shigeki Matsuo             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company (72) Inventor Yuji Kumagai             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company (72) Inventor Shohei Yamamoto             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company F-term (reference) 5C039 NN02

Claims (21)

[Claims] 1. An airtight container in which a discharge gas is sealed, and a power coupler inserted into a concave cavity of the airtight container, the power coupler including a high-frequency electromagnetic field associated with application of a high-frequency current. Electrodeless discharge lamp device comprising: an induction coil that excites the discharge gas to emit light by the generation of an electric field; The induction coil and the heat conductor are arranged in close contact with each of the magnetic cores, and the induction coil and the heat conductor are arranged in close contact with each other. An electrodeless discharge lamp device characterized by the above. 2. The heat conductor has a polygonal shape in cross section, while the magnetic core has a rectangular shape in cross section, and the magnetic cores are in close contact with the outer surface of the heat conductor. The electrodeless discharge lamp device according to claim 1, wherein 3. The electrodeless discharge lamp device according to claim 1, wherein the heat conductor is provided with a slit along the axial direction. 4. The electrodeless discharge lamp device according to claim 1, wherein the corners of the magnetic core are arcuate or chamfered. 5. The guide groove of the induction coil is formed on the outer surface of the magnetic core.
The electrodeless discharge lamp device according to claim 4. 6. The electrodeless discharge lamp device according to claim 1, wherein the magnetic cores are arranged in a state where they are in contact with each other. 7. The magnetic core is structured to be inserted and fitted in the thermal conductor, and the magnetic core and the thermal conductor are combined through a tapered contact surface. The electrodeless discharge lamp device according to any one of claims 1 to 6. 8. The electrodeless discharge lamp device according to claim 1, wherein an insulating film is formed on the outer surface of the magnetic core. 9. The electrodeless discharge lamp device according to claim 1, wherein unevenness is provided in a portion of the heat conductor that does not come into contact with the magnetic core. 10. The both ends of the magnetic core on which the induction coil is not wound are thickened in the diametrical direction, and the end faces of the magnetic core are projected to the outside of the outermost circumference of the wound induction coil. The electrodeless discharge lamp device according to any one of claims 1 to 9. 11. The assembly core is housed in a winding frame, and the winding frame is provided with a connecting column portion located between the magnetic cores. 10. The electrodeless discharge lamp device described in any one of 10. 12. The induction coil is wound by edgewise winding.
The electrodeless discharge lamp device described in any one of 1. 13. The electrodeless discharge lamp device according to claim 1, wherein the induction coil is wound in multiple layers. 14. The coil wire forming the induction coil is rectangular in cross section, and is wound so that its long side portion is in contact with the magnetic core. ~ The electrodeless discharge lamp device according to claim 11. 15. The electrodeless discharge lamp device according to claim 1, wherein the coil wire forming the induction coil has a hollow pipe shape. 16. The heat conductor extends to the inner depth of the concave cavity.
~ The electrodeless discharge lamp device according to claim 15. 17. The electrodeless discharge lamp device according to claim 1, wherein the insulating coating of the induction coil is thickened on the high voltage side and thinned except on the high voltage side. 18. The induction coil has a Litz structure coated with an exterior coating having high heat resistance, and the coil wire is coated with an interior coating having low heat resistance. The electrodeless discharge lamp device according to any one of claims 1 to 16. 19. The method according to claim 1, wherein a portion of the heat conductor in which the magnetic core is arranged is made of aluminum, and the other portion is made of copper. The electrodeless discharge lamp device described in any one of 1. 20. The electrodeless discharge lamp device according to claim 1, wherein the heat conductor is provided with an exhaust thin tube disposing space having an elliptical cross-sectional shape. 21. A metal cylinder is provided around the outer circumference of the induction coil wound around the assembly core, and a slit along the axial direction is formed in the metal cylinder. The electrodeless discharge lamp device according to any one of claims 1 to 20.