JP2005310682A - Electrodeless discharge lamp device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrodeless discharge lamp device capable of reducing the variation of an inductance value and a Q value of a coupler. <P>SOLUTION: This electrodeless discharge lamp device is provided with a bulb 1 filled with gas inside, the coupler 5 having a induction coil 3 wound around a core 2 for generating a high frequency electromagnetic field in the bulb 1 and a heat conductor 4 radiating heat generated by the core 2, and a metal conduction piece 7 having a positioning part 6 arranged in a position penetrated with the magnetic flux of the core 2 for adjusting a clearance between the core 2 and the position. The metal conduction piece 7 is formed into a ring shape substantially by using a metallic material such as aluminum, copper, and stainless. On the inside face of a hole in the metal conduction piece 7, a spiral rugged face 11 corresponding to an internal thread is formed as a positioning part 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electrodeless discharge lamp apparatus that discharges a discharge gas with a high-frequency electromagnetic field formed by passing a high-frequency current through an induction coil.

  As a conventional example of an electrodeless discharge lamp device, there is one disclosed in JP-T-11-501152. This comprises a discharge tube that is hermetically sealed, has a cavity, surrounds the discharge space and has an ionizable filler, and has a coil with a number of turns of an electrical conductor and soft magnetism in the cavity A body longitudinal axis and a thermal conductor assembly, the longitudinal axis of the assembly within the thermal conductor cavity or recesses exposing the core to the outer surface of the assembly In the electrodeless low-pressure discharge lamp arranged along the section, the heat conductor occupies at least half of the outer peripheral surface of the assembly in the cross section perpendicular to the longitudinal axis, and was further made of heat conductor and soft magnetic material. When the assembly composed of a single core and a plurality of cores is viewed in the cross section, the cross-sectional area of the heat conductor is at least 1/4 of the total surface area of the assembly.

That is, this conventional example defines the cross-sectional area ratio of an assembly composed of a single core and a plurality of cores made of a heat conductor and a soft magnetic material, thereby improving the heat dissipation effect without using a heat pipe. The lamp can be operated at higher power.
Japanese National Patent Publication No. 11-501152

  In the above conventional example, by increasing the heat dissipation effect, the temperature rise of the coil and the core can be suppressed, thereby reducing the variation range of the inductance value and the Q value (inductance value divided by the loss resistance) due to the temperature change. It is considered a thing.

  However, due to the structure of the assembly itself, there is a concern that when the assembly is manufactured, the inductance value and the Q value vary among lots. This is because the core is made of ceramics, resulting in dimensional variations, and the coil wire resistance value also varies in wire diameter. When the inductance value and the Q value vary, it is necessary to suppress the component variation used in the lighting circuit for lighting the lamp and increase the rating of the component, resulting in an increase in the cost of the component.

  The present invention has been made in view of such problems, and an object thereof is to provide an electrodeless discharge lamp device that can further suppress variations in the inductance value and Q value of an assembly (coupler). That is.

  The invention according to claim 1 includes a valve having a gas sealed therein, an induction coil that is wound around a core and generates a high-frequency electromagnetic field in the valve, and a coupler that includes a heat conductor that radiates heat generated by the core; In the electrodeless discharge lamp apparatus having the above, a metal conductor piece provided with a positioning portion for adjusting a distance from the core is provided at a position where the magnetic flux from the core passes.

  The invention according to claim 2 is the invention according to claim 1, wherein the positioning portion has a screw structure.

  The invention according to claim 3 is the invention according to claim 1, wherein the positioning portion is made of a resin material or a ceramic material.

  The invention according to claim 4 is the invention according to claim 1, wherein the metal conductor piece is made of a metal-based magnetic material.

  The invention according to claim 5 is the invention according to claim 1, wherein a metal conductor piece having a positioning portion for adjusting a distance from the core is provided at a position where the magnetic flux in the vicinity of one end of the core passes, and in the vicinity of the other end of the core. The magnetic piece provided with the positioning part which adjusts the space | interval with a core is provided in the position where magnetic flux of this passes.

  According to the present invention, it is possible to easily adjust the Q value and the inductance value of the coupler by providing the metal conductor piece provided with the positioning portion that adjusts the positional relationship with the coil in the vicinity of the core. This makes it possible to further suppress variations in the inductance value and the Q value.

(First embodiment)
This embodiment will be described with reference to FIGS. FIG. 1 is a cross-sectional view of the electrodeless discharge lamp device of the present embodiment. FIG. 2 is an exploded perspective view of the coupler excluding the induction coil. FIG. 3 is a perspective view (a) and a sectional view (b) of the metal conductor piece. FIG. 4 is a cross-sectional view of another example of the electrodeless discharge lamp device of the present embodiment.

  As shown in FIG. 1, the electrodeless discharge lamp apparatus according to the present embodiment includes a bulb 1 in which a gas is sealed, an induction coil 3 that is wound around a core 2 and generates a high-frequency electromagnetic field in the bulb 1 and a core 2 It has the coupler 5 provided with the heat conductor 4 which dissipates the heat which generate | occur | produces, and the metal conductor piece 7 provided with the positioning part 6 which adjusts the space | interval with the core 2 in the position where the magnetic flux of the core 2 passes. And

  The bulb 1 is obtained by processing a transparent material such as a glass material into a substantially light bulb shape, and contains a rare gas such as argon or krypton and mercury. The inner surface of the bulb 1 is coated with a phosphor that converts ultraviolet rays emitted from mercury into visible light and a protective film that protects the phosphor (both not shown). A recessed portion 8 that is recessed toward the inside of the valve is formed at the root portion of the valve 1, and an exhaust pipe 9 that extends from the bottom of the recessed portion 8 toward the root of the valve 1 is provided.

  The coupler 5 electrically connects the bulb 1 and a lighting circuit (not shown), and heat generated by the induction coil 3 and the core 2 wound around the core 2 to generate a high-frequency electromagnetic field in the bulb 1. A heat conductor 4 that holds the heat while radiating is provided. The heat conductor 4 is formed in a substantially cylindrical shape using a metal having good heat conductivity such as aluminum, and one end thereof includes a base portion 10 that extends in the radial direction. The heat conductor 4 is inserted into the recessed portion 8 of the valve 1, and an exhaust pipe 9 is inserted through the heat conductor 4. A core 2 through which the magnetic flux generated by the induction coil 3 passes is attached to the side surface of the heat conductor 4. The core 2 is obtained by processing an Mn—Zn ferrite material having a high frequency magnetic property into a substantially cylindrical shape. On the outer surface of the core 2, an induction coil 3 for generating a high-frequency electromagnetic field in the bulb 1 when a high-frequency current is supplied from a lighting circuit (not shown) is wound 16 turns through an insulating layer.

What is important here is that a metal conductor piece 7 provided with a positioning portion 6 for adjusting the distance from the core 2 is provided at a position where the magnetic flux of the core 2 passes in the coupler 5. That is, the metal conductor piece 7 provided with the positioning portion 6 is provided at one end of the heat conductor 4 located at the bottom of the recessed portion 8. Specifically, the metal conductor piece 7 is formed in a substantially ring shape using a metal material such as aluminum, copper, and stainless steel. As shown in FIG. 3, a spiral uneven surface corresponding to an internal thread is provided as a positioning portion 6 on the inner surface of the hole of the metal conductor piece 7. In addition, a spiral concavo-convex surface 11 corresponding to a male screw is provided in the vicinity of the top of the heat conductor 4 so as to be screwed into the concavo-convex surface of the metal conductor piece 7. When a magnetic flux is generated from the core 2 by flowing a high-frequency current having an order frequency, the magnetic flux intersects the metal conductor piece 7 as shown in FIG. When the magnetic flux crosses the metal conductor piece 7, an eddy current is generated in the metal conductor piece 7, thereby generating an eddy current loss. Since the magnitude of the eddy current loss depends on the distance between the core 2 and the metal conductor piece 7, the desired eddy current can be obtained by adjusting the distance between the core 2 and the metal conductor piece 7 by rotating the metal conductor piece 7. A loss can be obtained. Here, since the Q value of the coupler is obtained by dividing the inductance value by the loss resistance, the Q value can be adjusted. For example, the Q value is adjusted after the core 2 is attached to the heat conductor 4 and the induction coil 3 is formed on the side surface of the core 2. Specifically, when the Q value is larger than a desired value, the metal conductor piece 7 is turned to bring the metal conductor piece 7 closer to the core 2 to increase the eddy current loss. When the Q value is smaller than a desired value, the metal conductor piece 7 is rotated in the reverse direction to move the metal conductor piece 7 away from the core 2 so as to reduce eddy current loss.

  As described above, in the configuration of the present embodiment, since the position of the metal conductor piece 7 can be adjusted after the coupler 5 is assembled, it is possible to very easily suppress variations in the Q value.

  In the present embodiment, the positioning portion 6 has a screw structure. However, the present invention is not limited to this, and any configuration is possible as long as the positions of the metal conductor piece 7 and the core 2 can be fixed. 1 and 2, the metal conductor piece 7 is provided on the upper part of the core 2 (the bottom side of the indented part 8), but as shown in FIG. 4, it is provided on the lower part of the core 2 (on the base part 10 side). The effect is the same.

In the present embodiment, a metal material such as aluminum, copper, and stainless steel is used as the material of the metal conductor piece 7, but a metal-based magnetic material such as a silicon steel plate or an amorphous metal may be used.
When a metal-based magnetic material is used as the material of the metal conductor piece 7, when the metal conductor piece 7 is brought closer to the core 2, the magnetic materials are brought closer to each other, so that the inductance value is increased. On the other hand, when the metal conductor piece 7 is moved away from the core 2, the inductance value decreases. In addition, since eddy currents flow when the magnetic flux intersects in the metal-based magnetic body, the eddy current loss increases when the metal conductor piece 7 is brought closer to the core 2, and the eddy current loss occurs when the metal conductor piece 7 is moved away from the core 2. Becomes smaller. That is, since the eddy current loss increases as the inductance value increases, the inductance value can be changed while keeping the Q value substantially constant.
(Second Embodiment)
Next, a second embodiment will be described based on FIG. 5 and FIG. FIG. 5 is a cross-sectional view of the electrodeless discharge lamp device of the present embodiment. FIG. 6 is a perspective view (a) and a sectional view (b) of the metal conductor piece.

  In this embodiment, the point which made the material of the positioning part 6 into high heat-resistant resin or a ceramic differs from 1st Embodiment. That is, as shown in FIG. 6, the positioning portion 6 of the present embodiment is made of a high heat-resistant resin or ceramic material and is formed in a substantially ring shape like the metal conductor piece 7. It has the groove | channel 20 in which the shape-shaped metal conductor piece 7 is attached. Further, the uneven surface 11 provided on the heat conductor 4 shown in FIG. 5 is also formed of a high heat resistant resin or a ceramic material.

With this configuration, when the bulb 1 is turned on, the temperature of the positioning portion 6 rises due to heat from the induction coil 3, the core 2, and the bulb 1, but the expansion coefficient of the high heat resistant resin or ceramic material is higher than that of metal. Therefore, the distance between the core 2 and the metal conductor piece 7 can be maintained with higher accuracy than in the case where the positioning portion 6 is made of metal, thereby suppressing the variation of the Q value due to the temperature change. .
(Third embodiment)
Next, a third embodiment will be described with reference to FIG. FIG. 7 is a cross-sectional view of the electrodeless discharge lamp device of the present embodiment.

  The electrodeless discharge lamp device of this embodiment is different from the first embodiment in that a magnetic piece 30 having a positioning portion 6 is provided on the base portion 10 side of the heat conductor 4.

That is, a metal conductor piece 7 provided with a positioning portion 6 that adjusts the distance between the core 2 and the core 2 is provided at a position where the magnetic flux near one end of the core 2 passes. The magnetic piece 30 provided with the positioning part 6 which adjusts a space | interval is provided. The magnetic piece 30 is formed in a substantially ring shape using a material such as ferrite. Then, on the inner surface of the hole of the magnetic piece 30, a spiral uneven surface corresponding to an internal thread is provided as the positioning portion 6. And the heat conductor 4 is also provided with the spiral uneven surface 31 corresponding to the male screw so as to be screwed into the uneven surface of the magnetic piece 30. According to this configuration, the metal conductor piece described in the first embodiment The inductance value is adjusted by adjusting the position of the magnetic piece 30 in the same manner as in FIG. Specifically, when the inductance value is smaller than a desired value, the magnetic piece 30 is rotated to bring the magnetic piece 30 closer to the core 2.

Further, when the inductance value is larger than a desired value, the magnetic piece 30 is rotated in the reverse direction so as to move the magnetic piece 30 away from the core 2. Further, since the adjustment of the Q value is the same as that described in the first embodiment, the description thereof is omitted. Thus, in this embodiment, since the magnetic body piece 30 and the metal conductor piece 7 are provided, the inductance value and the Q value can be individually adjusted.

It is sectional drawing of the electrodeless discharge lamp apparatus of 1st Embodiment. It is a disassembled perspective view of the coupler except the induction coil in the same embodiment. It is (a) and sectional drawing (b) of the metal conductor piece in the embodiment. It is sectional drawing of the electrodeless discharge lamp apparatus of another example in the embodiment. It is sectional drawing of the electrodeless discharge lamp apparatus of 2nd Embodiment. It is the perspective view (a) and sectional drawing (b) of the metal conductor piece in the embodiment. It is sectional drawing of the electrodeless discharge lamp apparatus of 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve | bulb 2 Core 3 Induction coil 4 Thermal conductor 5 Coupler 6 Positioning part 7 Metal conductor piece 8 Recessed part 9 Exhaust pipe 10 Base part 11 Uneven surface

Claims (5)

An electrodeless discharge lamp apparatus comprising: a bulb in which a gas is enclosed; an induction coil that is wound around a core to generate a high-frequency electromagnetic field in the valve; and a coupler that includes a heat conductor that dissipates heat generated by the core. In the electrodeless discharge lamp apparatus, a metal conductor piece provided with a positioning portion for adjusting a distance from the core is provided at a position where the magnetic flux from the core passes. The electrodeless discharge lamp device according to claim 1, wherein the positioning portion has a screw structure. The electrodeless discharge lamp device according to claim 1, wherein the positioning portion is made of a resin material or a ceramic material. The electrodeless discharge lamp device according to claim 1, wherein the metal conductor piece is made of a metal-based magnetic material. A metal conductor piece provided with a positioning part for adjusting the gap with the core is provided at a position where the magnetic flux near one end of the core passes, and a positioning part for adjusting the gap with the core at a position where the magnetic flux near the other end of the core passes. 2. The electrodeless discharge lamp device according to claim 1, further comprising a magnetic piece provided.

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