JP2006012636A - Electrodeless discharge lamp device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrodeless discharge lamp device preventing generation of ground fault current by dielectric deterioration of the circumference of a heat conductor and also preventing the dropping-out of a bulb by deterioration of a bobbin. <P>SOLUTION: An induction coil 12 receives supply of high frequency power by a high frequency power source and lights the lamp by working high frequency magnetic field to a discharge gas in a bulb formed of a translucent material and sealed with the discharge gas. The induction coil 12 is wound on a synthetic resin-made bobbin 11, which supports the bulb and includes a terminal part 15 for connecting the terminal part of the induction coil 12 to the high frequency power source. The heat conductor 14 composed of a conductor for releasing the heat generated in the induction coil 12 is inserted to the bobbin 11. The terminal part 15 includes a partition member 18 arranged on the heat conductor 14 through part of the bobbin 11 and mutually insulating the terminal parts of the induction coil 12. The partition member 18 is formed of a synthetic resin which causes dielectric deterioration earlier than the synthetic resin forming the bobbin 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electrodeless discharge lamp apparatus that emits light by applying a high-frequency electromagnetic field to a discharge gas sealed in a bulb formed of a light-transmitting material to generate a high-frequency discharge.

  Conventionally, a high frequency electromagnetic field is caused to act on a discharge gas by using an induction coil or the like from the outside of the bulb without providing an electrode inside the bulb formed of a translucent material and enclosing the discharge gas. An electrodeless discharge lamp that emits light is provided.

  Various types of electrodeless discharge lamps of this type are known. For example, as shown in FIG. 5, an insertion recess (so-called cavity) 1a is formed in a part of the bulb 1, and the insertion recess is formed. There is a shape in which the induction coil 12 is inserted in the place 1a. In the illustrated example, the induction coil 12 is wound around a cylindrical core 13 made of a soft magnetic material, and the core 13 is supported by a cylinder 20 (see, for example, Patent Document 1). This configuration has an advantage in manufacturing that the valve 1 can be hermetically sealed and can be easily assembled.

  However, since the induction coil 12 and the core 13 arranged in the cavity 1a are susceptible to the heat from the bulb 1 that is lit, the insulating material that covers the winding of the induction coil 12 is used. There is a problem that the lifetime or reliability is not sufficient. That is, it can be said that the life of this type of electrodeless discharge lamp device is determined by the life of the insulating material.

On the other hand, as shown in FIG. 6, when the induction coil 12 is housed in the cavity 1a, a heat conductor 14 made of copper or the like is inserted inside the core 13 in order to efficiently extract the heat in the cavity 1a to the outside. The thing is proposed (for example, refer patent document 2). In this configuration, a core 13 is arranged inside a synthetic resin bobbin 11 around which an induction coil 12 is wound.
JP-A-4-308649 Japanese National Patent Publication No. 11-508405

  By providing the heat conductor 14 as described above, it is possible to prevent the induction coil 12 from being deteriorated by heat from the valve 1. On the other hand, since there is no electrode inside the bulb 1, the life of the bulb 1 is very long, and although there is a deterioration in the luminous flux, it is difficult to cause non-lighting due to a broken bulb like an electroded discharge lamp. , The design life is defined by the degree of degradation of the luminous flux. However, since there is almost no blowout, it is often used beyond the design life, and the bobbin covering the insulating material of the induction coil 12 and the heat conductor 14 before the bulb 1 is actually turned off. One of the 11 insulating materials and the resin member for holding the valve 1 on the bobbin 11 may have a lifetime. When the insulating material of the induction coil 12 or the bobbin 11 reaches the end of its life before the valve and deteriorates, it is conceivable that the current flowing through the induction coil 12 flows into the heat conductor 14 that is a conductor, resulting in a ground fault state. When a ground fault occurs, an excessive current may flow, and in a general electrodeless discharge lamp device, since a ground fault countermeasure is not performed by a circuit, it is required to prevent the occurrence of a ground fault current. Further, when the resin member for holding and fixing the valve 1 to the bobbin 11 is deteriorated due to the end of its life, the valve 1 may come off and fall off.

  The present invention has been made in view of the above-mentioned reasons, and its object is to prevent the occurrence of a ground fault current passing through the heat conductor due to the insulation deterioration around the heat conductor, and the valve due to the deterioration of the bobbin. It is an object of the present invention to provide an electrodeless discharge lamp device that prevents the falling off of the lamp.

  The invention of claim 1 includes a bulb formed of a light-transmitting material and filled with a discharge gas, an induction coil that is supplied with high-frequency power from a high-frequency power source and that is caused to act by applying a high-frequency electromagnetic field to the discharge gas in the bulb, Heat conduction consisting of a synthetic resin bobbin with a terminal portion that is wound with an induction coil and supports a valve and that connects the terminal portion of the induction coil to a high-frequency power source, and a conductor for releasing heat generated in the induction coil And the terminal portion is disposed through a part of the bobbin with the heat conductor, and includes a partition member that insulates between the end portions of the induction coil, and the partition member forms a bobbin It is formed of a synthetic resin whose insulation deterioration is faster than that of the synthetic resin.

  According to this configuration, since the partition member that insulates between the end portions of the induction coil has a faster insulation deterioration than the bobbin that keeps the insulation between the terminal portion and the heat conductor, the terminal portion is thermally conductive due to the insulation deterioration of the bobbin. Before contacting the body, a short circuit occurs at the terminal portion, and it is possible to prevent a ground fault current from being generated through the heat conductor. In addition, the bobbin supports the valve, but before the terminal part and the heat conductor are short-circuited due to the insulation deterioration of the bobbin, the terminal part is short-circuited due to the insulation deterioration of the terminal part and the induction coil is not energized. It is possible to cope with a drop in strength due to deterioration of the valve before the valve falls from the bobbin.

  According to a second aspect of the present invention, in the first aspect of the present invention, the partition member is made of an insulating resin filled so as to fill a terminal portion of the induction coil.

  According to this configuration, since the terminal portion of the coil is charged with the insulating resin, there is no deterioration in insulation between the terminal portions of the coil due to the influence of humidity, and factors other than the material characteristics of the bobbin and the partition member It is possible to suppress the deterioration of insulation in the case, and to give a clear difference in the lifetime between the bobbin and the partition member.

  According to a third aspect of the present invention, in the first aspect of the invention, the partition member is a connector housing that detachably connects a conductive member connected to a terminal portion of the induction coil and a conductive member connected to the high-frequency power source. It is characterized by being.

  According to this configuration, since the high frequency power source can be attached and detached by the connector, workability at the time of assembly and construction is improved.

  According to the configuration of the present invention, the partition member that insulates between the end portions of the induction coil has a faster insulation deterioration than the bobbin that keeps the insulation between the terminal portion and the heat conductor. Before contacting the heat conductor, a short circuit occurs in the terminal portion, and there is an advantage that it is possible to prevent the occurrence of a ground fault current through the heat conductor. In addition, the bobbin supports the valve, but before the terminal part and the heat conductor are short-circuited due to the insulation deterioration of the bobbin, the terminal part is short-circuited due to the insulation deterioration of the terminal part and the induction coil is not energized. There is an advantage that it is possible to cope with the drop in strength due to deterioration of the valve before it falls from the bobbin.

(Embodiment 1)
As in the conventional configuration shown in FIGS. 5 and 6, this embodiment is suitable for an electrodeless discharge lamp including a bulb 1 having an insertion recess 1 a, and as shown in FIG. A bobbin 11 including a winding frame portion 11a to be inserted into the insertion recess 1a and a support base portion 11b coupled to one end of the winding frame portion 11a is provided. The winding frame part 11a and the support base part 11b are the same synthetic resin molded product, and the induction coil 12 is wound around a part of the winding frame part 11a. Further, a guide groove 11c for guiding the end portion of the induction coil 12 is formed in the winding frame portion 11a. A cylindrical core 13 having excellent high-frequency magnetic properties is inserted inside the winding frame portion 11a. Mn—Zn ferrite is used for the core 13. Therefore, if the induction coil 12 is energized with a high frequency current, the core 13 can efficiently generate a high frequency electromagnetic field.

  Inside the core 13, a part of the heat conductor 14 formed of a material having excellent heat conductivity is disposed so as to contact the core 13. For the heat conductor 14, copper, aluminum, copper or an alloy of aluminum is used. These materials are good heat conductors and good electric conductors (conductors). The heat conductor 14 has a rod-like portion inserted into the winding frame portion 11a and a plate-like portion covered with the support base portion 11b, and a part of the plate-like portion is provided at a plurality of locations (around the periphery of the support base portion 11b ( It functions as a mounting piece 14a for projecting at three locations in the illustrated example and mounting to other members. A mounting hole 14b is formed through the mounting piece 14a, and a fixing tool such as a screw is inserted into the mounting hole 14b so that it can be fixed to another member using the fixing tool. By providing such a heat conductor 14, the heat around the induction coil 12 can be released to the outside of the valve 1, and if the mounting piece 14a is coupled to another member, the heat is released to the other member. Is possible.

  A terminal portion 15 is formed on a part of the peripheral portion of the support base portion 11b. The terminal portion 15 is provided to connect a lead wire 16 from a high frequency power source (not shown) that supplies high frequency power to the induction coil 12 and the end portion 12a of the induction coil 12, and a support base portion. A recess 15a is formed by recessing the surface on the winding frame 11a side in a part of the circumferential direction of 11b. In the recess 15a, as shown in FIG. 2, two terminal plates 15b are arranged, and a partition member 17 is arranged between both terminal plates 15b. The partition member 17 includes a horizontal piece 17a that keeps a distance between both terminal plates 15b, a vertical piece 17b that secures a creeping distance between both terminal plates 15b, and a fixing piece 17c that is fixed to the support base 11b. Is provided. Each terminal plate 15b is connected to the end portion 13a of the induction coil 12, and the lead wire 16 of the high frequency power source is also connected to each terminal plate 15b.

  By the way, the partition member 17 is a synthetic resin molded product, and is formed of a different type of synthetic resin from the support base portion 11b. The synthetic resin forming the support base part 11b and the partition member 17 both have insulation properties, but the material forming the partition member 17 has a longer insulating performance than the material forming the support base part 11b. The one that is easy to deteriorate is selected. Therefore, if the insulation performance of the partition member 17 deteriorates before the insulation performance of the support base 11b when the product is used beyond the design life, the insulation between the terminal plates 15b cannot be maintained, and the induction coil Since 12 is not energized, the electrodeless discharge lamp becomes inconspicuous. Further, since the high frequency power supply generally has a protection function against a short circuit of the lead wire 16, the operation of the high frequency power supply is stopped by the high frequency power supply protection function.

  As described above, even if the use is continued for a long time exceeding the design life, the heat conductor 14 and the terminal plate 15b are short-circuited due to the deterioration of the support base 11b to cause a ground fault or the reel portion. The valve 1 does not fall off due to deterioration of the 11a or the support base part 11b, and high safety is obtained. In addition, the user can be urged to replace the valve 1 because the valve 1 becomes inconspicuous.

  The synthetic resin forming the partition member 17 has a shorter life than the winding frame portion 11a and the support base portion 11b by using a resin having a lower heat resistance temperature than the synthetic resin forming the winding frame portion 11a and the support base portion 11b. can do. For example, a very high heat resistance synthetic resin such as fluororesin, liquid crystal polymer, or PPS is used for the winding frame portion 11a and the support base portion 11b, and a heat resistance such as PET, PBT, or nylon is used for the partition member 17. A relatively high synthetic resin may be used. Moreover, you may use the material which has a difference in the grade (namely, weather resistance) of the deterioration by an ultraviolet-ray for the winding frame part 11a and the support stand part 11b, and the partition member 17. FIG. That is, since not only visible light but also ultraviolet rays are radiated from the electrodeless discharge lamp (generally, mercury is included in the discharge gas), the partition member 17 is deteriorated by ultraviolet rays more than the winding frame portion 11a and the support base portion 11b. By using a quicker one, the same effect as in the case where the heat resistance is different can be obtained.

(Embodiment 2)
In the present embodiment, as shown in FIG. 3, a recess 15 a provided in the terminal portion 15 is filled with an insulating resin 18, and the insulating resin 18 is used as the partition member 17. The recess 15a is opened only on one surface to fill the insulating resin 18, and the remaining surface is closed. The other configuration is the same as that of the first embodiment. In this embodiment, the terminal board 15b is covered with the insulating resin 18 so that there is no gap around the terminal board 15b, and as a result, the insulation deterioration due to the influence of humidity is suppressed. It will be. That is, the influence of humidity can be removed as a factor that degrades the insulation between the terminal plates 15b, and a clear difference can be given to the life of the support base 11b and the partition member 17 due to heat or ultraviolet rays. Other configurations and functions are the same as those of the first embodiment.

(Embodiment 3)
In the present embodiment, as shown in FIG. 4, a detachable connector 19 is used to connect the terminal portion of the induction coil 12 and the lead wire 16 of the high frequency power source. In the illustrated example, a connector 19 detachably inserted into a recess 15 a forming the terminal portion 15 is used, and the lead wire 16 is connected to the connector 19. Therefore, the terminal portion of the induction coil 12 is connected to the terminal plate 15b fixed to the terminal portion 15 or a conductive member corresponding to the terminal plate 15b. This type of conductive member is often formed in a pin shape, but any shape may be used. In the present embodiment, the synthetic resin that forms the housing of the connector 19 is used for the partition member by being formed of a material that is more easily deteriorated than the support base 11b. Before the insulation performance of the portion 11b deteriorates, the insulation performance of the connector 19 which is a partition member deteriorates.

  According to the configuration of the present embodiment, the same effects as those of the first embodiment can be obtained, and the attachment and detachment with the high-frequency power source is easy, so that the workability at the time of assembling or construction is improved. Note that the entire housing of the connector 19 may not be formed of the same synthetic resin, but may be formed of a synthetic resin with quick insulation deterioration only between terminals in the housing of the connector 19. Other configurations and functions are the same as those of the first embodiment.

It is a principal part perspective view which shows Embodiment 1 of this invention. It is the perspective view which expanded the principal part same as the above. It is the perspective view which expanded the principal part which shows Embodiment 2 of this invention. It is a principal part perspective view which shows Embodiment 3 of this invention. It is principal part sectional drawing which shows a prior art example. It is sectional drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve | bulb 11 Bobbin 12 Induction coil 14 Thermal conductor 15 Terminal part 17 Partition member 18 Insulation resin 19 Connector

Claims (3)

  A bulb formed of a light-transmitting material and filled with a discharge gas, an induction coil that is supplied with high-frequency power from a high-frequency power source to cause the discharge gas in the bulb to act on the discharge gas and lit, and an induction coil are wound And a synthetic resin bobbin having a terminal portion for supporting the valve and connecting the terminal portion of the induction coil to a high frequency power source, and a heat conductor made of a conductor for releasing heat generated in the induction coil, and a terminal portion. The heat conductor is disposed through a part of the bobbin and has a partition member that insulates between the end portions of the induction coil, and the partition member is more deteriorated in insulation than the synthetic resin forming the bobbin. An electrodeless discharge lamp device characterized by being formed of a fast synthetic resin.   2. The electrodeless discharge lamp device according to claim 1, wherein the partition member is made of an insulating resin filled so as to fill an end portion of the induction coil.   2. The electrodeless discharge device according to claim 1, wherein the partition member is a housing of a connector that detachably connects a conductive member connected to a terminal portion of the induction coil and a conductive member connected to the high-frequency power source. Electric light device.

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