JP2006236691A - Electrodeless discharge lamp device and luminaire thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrodeless discharge lamp device for improving luminous efficiency when using a core for forming an open magnetic circuit. <P>SOLUTION: In the electrodeless discharge lamp device, having a ferrite core 2 that is inserted into a valve 1 in which discharge gas is sealed inside for supplying a high-frequency electromagnetic field, and an induction coil 3 wound around the ferrite core 2, the ferrite core 2 is formed so that it has a collar section 5 extended along the outer surface of the valve 1. The ferrite core 2 efficiently generate a high-frequency electromagnetic field in the valve 1 through magnetic flux generated by the induction coil 3, and uses for example an Mn-Zn ferrite material having improved high-frequency magnetic characteristics. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electrodeless discharge lamp device and its lighting fixture.

  As a conventional example related to the electrodeless discharge lamp device, for example, there is one disclosed in Japanese Patent Application Laid-Open No. 2003-86145. This is a valve formed in a closed loop shape with a light-transmitting material, a rod-shaped core disposed on the substantially central axis of the valve and inserted inside the valve, and wound around the rod-shaped core An induction coil, a ring-shaped core through which the valve penetrates, an induction coil wound around the rod-shaped core, a ring-shaped core through which the valve penetrates, and an auxiliary induction coil wound around the ring-shaped core I have.

It is described that this configuration has an effect that the start can be surely performed regardless of the size of the bulb or the length of the discharge path without the bulb, even when a high output is required.
JP 2003-86145 A (first page)

  In the above conventional example, since the ring-shaped core covers the bulb, a part of the light output from the bulb is kicked, that is, the light output from the bulb is not output in the desired irradiation direction, so there is room for improvement in luminous efficiency. was there.

  Further, when the ring-shaped core is omitted in the conventional example, since the rod-shaped core forms an open magnetic path, there is a relatively large amount of magnetic flux that does not cross the bulb, and there is room for improving the light emission efficiency.

The present invention has been made in view of such problems, and the object of the present invention is as follows.
It is an object of the present invention to provide an electrodeless discharge lamp device capable of improving luminous efficiency when a core that forms an open magnetic path is used.

  The invention according to claim 1 is an electrodeless discharge lamp apparatus comprising: a ferrite core that is inserted into a bulb in which a discharge gas is sealed to supply a high-frequency electromagnetic field; and an induction coil wound around the ferrite core. The ferrite core is formed to have a flange extending along the outer surface of the bulb.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, a protrusion surrounding the part of the valve is provided at the edge of the flange portion of the ferrite core.

  The invention according to claim 3 is the invention according to claim 1, characterized in that a heat radiating plate for dissipating heat of the ferrite core is provided on the surface opposite to the surface on which the valve of the flange portion is installed. .

  The invention according to claim 4 is characterized in that, in the invention according to claim 1, a resin reflector is provided between the ferrite core and the valve.

  According to a fifth aspect of the present invention, in the first to fourth aspects of the present invention, an illumination is provided, comprising: a housing that houses the electrodeless discharge lamp device; and a high-frequency power source that allows a high-frequency current to flow through the induction coil. It is characterized as an instrument.

  According to the present invention, since the ferrite core is formed so as to have the flange extending along the outer surface of the bulb, the magnetic flux can be linked to the bulb efficiently, and thus the luminous efficiency can be expected to be improved. .

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

  As shown in FIG. 1, the electrodeless discharge lamp lighting device of the present embodiment includes a bulb 1 in which a discharge gas is sealed, a ferrite core 2 that is inserted into the bulb 1 and supplies a high-frequency electromagnetic field to the bulb 1, And an induction coil 3 wound around a ferrite core 2.

  The bulb 1 is formed in a closed loop substantially straight pipe shape using a tube made of a light-transmitting material such as quartz glass, soda / lime glass, or the like. Thereby, an opening 4 into which the ferrite core 2 is inserted is formed inside the bulb 1. The valve 1 is formed, for example, by preparing two bent parts by applying heat to one tube and thermally welding them. The bulb 1 is filled with mercury that is excited by a high-frequency electromagnetic field induced by the induction coil 3 to emit ultraviolet rays and a rare gas such as argon gas that is a buffer gas, and mercury is contained on the inner wall surface of the bulb 1. A phosphor that converts the emitted ultraviolet light into visible light is applied.

  The ferrite core 2 efficiently generates a high-frequency electromagnetic field in the valve 1 through the magnetic flux generated by the induction coil 3. For example, a material of Mn-Zn ferrite having good high-frequency magnetic characteristics is used, and the valve as shown in FIG. The flange portion 5 extending along the outer surface of 1 and the insertion portion 6 inserted from the flange portion 5 into the opening portion 4 of the valve are integrally formed so as to be substantially T-shaped in a cross-sectional view. And this ferrite core 2 is formed in the shape extended in the longitudinal direction of the valve | bulb 1 so as to correspond to the opening part 4 formed by making the valve | bulb 1 into a closed loop shape. An 8-turn induction coil 3 that is connected to a high-frequency power source (not shown) and generates a magnetic flux in the ferrite core 2 is wound around the side surface of the insertion portion 6. Further, the flange portion 5 substantially orthogonal to the insertion portion 6 has a width corresponding to the lateral width of the valve 1 as shown in FIG. The surface of the flange portion 5 opposite to the surface on which the valve 1 is provided is formed in a substantially flat shape, and a flat plate made of a metal material such as copper that dissipates heat generated by the ferrite core 2 on the surface. A heat sink 8 is attached via an adhesive 9. The valve 1 is fixed to the ferrite core 2 by a holder (not shown).

  In the above configuration, when a high frequency current is supplied from a high frequency power source (not shown) and the induction coil 3 generates a magnetic flux in the upward direction of FIG. 2, the magnetic flux passes through the insertion portion 6 of the ferrite core 2, and A magnetic circuit that divides in two directions from the top and intersects perpendicularly to the axis of the valve 1 so that the magnetic flux reaches the flange part 5 of the ferrite core 2 installed on the back surface of the valve 1 and returns to the insertion part 6 Form a closed loop. Further, when a current in the reverse direction flows through the induction coil 3, the induction coil 3 generates a magnetic flux in the downward direction of FIG. 2, and generates a magnetic flux in the direction opposite to the arrow shown in FIG. As described above, a high-frequency magnetic field is generated by interlinking with the axis of the bulb 1 to generate a high-frequency electromagnetic field, and discharge is started. The mercury flowing in the bulb 1 is excited to emit ultraviolet rays, and the phosphor applied to the inner surface of the bulb 1 emits light.

  Thus, by providing the ferrite core 2 with the flange 5 extending to the outer surface of the valve 1, the magnetic flux generated by the induction coil 3 does not escape in the direction of the lower surface in FIG. For this reason, the magnetic flux can be linked to the bulb 1 efficiently, and this can be expected to improve the luminous efficiency. Further, since the ferrite core 2 does not exist in the light irradiation direction from the bulb 1, that is, in the upward direction in FIG. 2, there is no so-called light kicking, which is light absorption and unnecessary light reflection by the ferrite core 2. Is uniform and the luminous efficiency can be improved. Further, since the magnetic flux generated by the induction coil 3 passes through the ferrite core 2 and hardly escapes to the surface of the flange 5 opposite to the surface on which the insertion portion 6 is provided, the heat dissipation effect is obtained as the heat radiating plate 8. Even if a metal material such as high aluminum or copper is used, eddy current due to the passage of magnetic flux does not occur, and loss in the heat radiating plate 8 can be suppressed. Furthermore, since the heat radiating plate 8 has a simple heat radiating structure of a single plate, it is easy to assemble and can be reduced in size and thickness.

In the present embodiment, the long ferrite core 2 is used so as to extend in the longitudinal direction of the valve 1 along the opening 4 of the valve 1 as shown in FIG. 1, but there are two pieces as shown in FIG. The short ferrite core 2 may be installed at a predetermined interval, and the induction coil 3 may be wound around the two ferrite cores 2.
(Second Embodiment)
This embodiment will be described with reference to FIG. FIG. 4 is a cross-sectional view of the electrodeless discharge lamp device of the present embodiment.

  This embodiment is mainly different from the first embodiment in that a protrusion 20 surrounding a part of the valve 1 is provided at the edge of the flange portion 5 of the ferrite core 2.

  That is, the ferrite core 2 is substantially E-shaped with an insertion portion 6 inserted into the opening 4 of the valve 1 and a protrusion 5 that protrudes from both ends of the flange 5 and the flange 5 toward the valve 1. The top part 7 of the insertion part 6 and the top part 21 of the protrusion part 20 are formed so as to surround a part of the valve 1 at substantially the same height. The induction coil 3 is wound along the surface of the flange 5 between the insertion portion 6 and the protrusion 20.

When formed in this way, when a high frequency current is passed through the induction coil 3 from a high frequency power source (not shown) to generate a magnetic flux upward from the top of the insertion portion 6 in the ferrite core 2, as shown in FIG. The magnetic flux emitted from the insertion portion 6 links the valve 1 in a direction substantially orthogonal to the axial direction of the valve 1. Then, a magnetic circuit is formed which mainly enters the top portion 21 of the protruding portion 20 and returns to the inserting portion 6 through the protruding portion 20 and the flange portion 5. Further, when the polarity of the high-frequency current flowing through the induction coil 3 is reversed, a magnetic flux is generated from the top portion 21 of the protruding portion 20 toward the top portion 7 of the insertion portion 6 in the opposite direction to the above-described magnetic flux direction. To do. As a result, as in the first embodiment, a high-frequency magnetic flux alternates with the shaft of the valve 1 to generate a high-frequency electromagnetic field, and discharge starts, so that the axial direction of the valve 1, that is, the valve 1 A discharge current flows in the longitudinal direction to excite mercury in the bulb 1 to emit ultraviolet rays, and the phosphor applied on the inner surface of the bulb 1 emits light.

  As described above, since the magnetic flux passes between the top portion 7 of the insertion portion 6 and the top portion 21 of the protruding portion 20, the magnetic flux is lower in the direction of the first embodiment, that is, in the direction in which the heat radiating plate 7 is installed. Therefore, it is possible to efficiently link the magnetic flux to the bulb 1 and to improve the light emission efficiency.

In the present embodiment, the tube-shaped valve 1 is formed in a closed loop shape. However, as shown in FIG. 5, the insertion portion 6 may be inserted by providing a concave portion 22 in the valve 1.
(Third embodiment)
This embodiment will be described with reference to FIG. FIG. 6 is a cross-sectional view of the electrodeless discharge lamp device of the present embodiment.

  This embodiment is mainly different from the second embodiment in that a resin reflector 30 that reflects light output from the bulb 1 is provided between the ferrite core 2 and the bulb 1.

  The resin reflector 30 is formed using, for example, white acrylic resin so as to cover the insertion portion 6 and the protruding portion 20 along the surface of the ferrite core 2. An induction coil 3 is wound around a portion of the resin reflector 30 that covers the insertion portion 6. Further, a heat radiating plate 8 is bonded to the back surface of the ferrite core 2, that is, the lower surface of the ferrite core 2 in FIG. 6 by an adhesive 9, and the high frequency current of the induction coil 3 is supplied to the other surface of the heat radiating plate 8. A high frequency power supply 31 is attached. A metal casing 32 is installed so as to cover the high frequency power supply 31.

  In this configuration, the light output toward the surface of the ferrite core 2 out of the light generated by the bulb 1 does not reach the ferrite core 2 but reaches the surface of the resin reflecting plate 30, and the resin reflecting plate 30. Reflected on the surface. The heat generated by the ferrite core 2 is transmitted to the housing 32 via the heat radiating plate 7 and is radiated to the outside.

  Thus, by providing the resin reflector 30 between the bulb 1 and the ferrite core 2, the light output from the bulb 1 can be efficiently reflected to the front surface while suppressing eddy current loss occurring in the metal material. Can do. Moreover, since the resin reflecting plate 30 is formed along the insertion part 6 from which the ferrite core 2 protrudes, it can also serve as a bobbin around which the induction coil 3 is wound. Furthermore, by installing the high-frequency power supply 31 via the heat sink 8, a thin integrated system can be constructed, application deployment to other instruments is facilitated, and the device part can be replaced with conventional instruments. Become.

It is a disassembled perspective view of the electrodeless discharge lamp apparatus of the embodiment. It is sectional drawing of the electrodeless discharge lamp apparatus of 1st Embodiment. It is a perspective view of the ferrite core and induction coil of another example of the embodiment It is sectional drawing of the electrodeless discharge lamp apparatus of 2nd Embodiment. It is sectional drawing of the electrodeless discharge lamp apparatus of another example of the same embodiment. It is sectional drawing of the electrodeless discharge lamp apparatus of 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve | bulb 2 Ferrite core 3 Inductive coil 4 Opening part 5 Gutter part 6 Insertion part 7 Top part 8 Heat sink 9 Adhesive

Claims (5)

In an electrodeless discharge lamp apparatus comprising a ferrite core that is inserted into a bulb in which a discharge gas is sealed and supplies a high-frequency electromagnetic field, and an induction coil wound around the ferrite core, the ferrite core is connected to the bulb. An electrodeless discharge lamp device, characterized in that it has a flange extending along the outer surface. 2. The electrodeless discharge lamp device according to claim 1, wherein a protruding portion surrounding a part of the bulb is provided at an edge of the flange portion of the ferrite core. 2. The electrodeless discharge lamp device according to claim 1, wherein a heat radiating plate for radiating heat of the ferrite core is provided on a surface opposite to a surface on which the bulb of the flange is installed. The electrodeless discharge lamp device according to claim 1, wherein a resin reflector is provided between the ferrite core and the bulb. An illumination fixture comprising: a housing that houses the electrodeless discharge lamp device according to any one of claims 1 to 4; and a high-frequency power source that supplies a high-frequency current to the induction coil.

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