JP2005044751A - Electrodeless discharge lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrodeless discharge lamp having a core with a good heat radiation property excellent in assembling property. <P>SOLUTION: The electrodeless discharge lamp comprises a high frequency electromagnetic field generating means arranged at a concave part of a bulb; a first heat radiation body radiating the heat of a core constructing the high frequency electromagnetic field generating means; and a second heat radiation body located at the inner wall of the core, spreading in a radial direction and coming near to the inner wall of the core and the first heat radiation body when compressed in the direction of an axial center. Since the second heat radiation body gets into a state of being compressed in the direction of the axial center due to the assembling of a device, the heat radiation property of the core is improved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electrodeless discharge lamp apparatus that does not have an electrode in a bulb in which a discharge gas is sealed, and excites and emits the discharge gas by a high-frequency electromagnetic field generated by flowing a high-frequency current through an induction coil.

  2. Description of the Related Art Conventionally, an electrodeless discharge lamp device that supplies a high-frequency electromagnetic field to a discharge gas sealed in a bulb to excite and emit the discharge gas is known (see Patent Document 1). The electrodeless discharge lamp device uses a bulb having a hollow portion made of a translucent material, a discharge gas is sealed inside the bulb, a phosphor is applied to the inner wall of the bulb, and a high-frequency electromagnetic field generating means is provided in the hollow portion. It has been. The high-frequency electric field generation means is composed of a soft magnetic core and an induction coil wound around the core, and the high-frequency electromagnetic field generated in the induction coil is caused to flow into the plasma in the valve by flowing a high-frequency current through the induction coil. It is generated in the generation region and the discharge gas is excited and emitted. The electrodeless discharge lamp apparatus of the type having a high-frequency electromagnetic field generating means in the recess has an advantage that the operating frequency can be lowered by using the core. However, since the core and the induction coil are provided in the indentation part, there is a drawback in that their temperature tends to rise due to heat generated when the electrodeless discharge lamp is lit. If the temperature of the core rises too much, the magnetic permeability of the core decreases and the loss increases, or in the worst case, the electrodeless discharge lamp is turned off.

Therefore, in this type of electrodeless discharge lamp device, a cylindrical core is used and a heat sink is provided inside the core, or the core is heated by using a rod-shaped core and providing a heat sink outside. To prevent.
JP 2001-325920 A

  By the way, in such an electrodeless discharge lamp apparatus, in order to improve heat dissipation, it is necessary to closely contact the heat sink and the core. However, if the dimensional tolerance is reduced, the core and the heat sink have their own thermal expansion. Therefore, when the electrodeless discharge lamp is lit, mechanical stress is applied to the core and the core may be damaged, and it is difficult to insert the core into the heat sink. Sexuality gets worse. Further, when the tolerance of the dimension is increased, the adhesion is deteriorated, the temperature of the core is increased, and the above-described problems may occur.

  As an example of countermeasures against this problem, there is an invention disclosed in Japanese Unexamined Patent Publication No. 4-308648. In this example, the thermal conductivity between the heat radiating body and the core is increased by at least substantially filling the periphery of the core with an elastic polymer. Here, the elastic polymer is, for example, silicon rubber.

  However, in order to fill the elastic polymer with a resin such as silicon rubber, it takes time and tact to pour the resin and then to dry and fix it, which increases the cost, and the elastic polymer is fixed. Until then, it is difficult to fix the core and the heatsink, resulting in poor productivity.

  The present invention has been made in view of the above problems, and an object of the present invention is to propose an electrodeless discharge lamp device that has excellent heat dissipation of the core and excellent assemblability.

  In order to solve the above-mentioned problems, the present invention provides a bulb formed of a light-transmitting material enclosing a discharge gas inside, coated with a phosphor on the inner wall, having a recess, and supplying a high-frequency electromagnetic field to the bulb. An induction coil, a cylindrical core provided inside the induction coil, and a high-frequency electromagnetic field generating means configured to hold the core and transmit heat generated in the core and dissipate heat. In the electrodeless discharge lamp device in which the high-frequency electromagnetic field generating means is disposed in the indented portion, the electrode is located in the inner wall of the core and expands in the radial direction when compressed in the axial direction. A second heat radiating body is provided adjacent to the inner wall and the first heat radiating body, and the second heat radiating body is compressed in the axial direction by assembling the apparatus.

  The second heat radiator is a spring member wound in a spiral shape and a member having elasticity, and the elastic member is provided between the spring member wound in a spiral shape and the core. Also good.

  A bobbin for winding the induction coil may be provided outside the core, and the second heat radiating body may be compressed in the axial direction by the bobbin and the first heat radiating body.

  The second heat radiator includes a spring member wound in a spiral shape, and the spring member wound in a spiral shape is provided inside the core and outside in the axial direction thereof. The outer diameter of the core may be larger, and the core may be held in the radial direction by the inner core and in the axial direction by the outer core.

  According to the present invention, the second heat radiating body is compressed in the axial direction by the assembly of the device, whereby the heat radiating body expands in the radial direction and close to the inner wall of the core and the first heat radiating body. The heat dissipation of becomes good. In addition, the assemblability is superior to the conventional example in which the elastic polymer is filled.

  The best mode for carrying out the present invention will be described below for each example.

  1 and 2 show an electrodeless discharge lamp apparatus according to Embodiment 1 of the present invention. This device is inserted into a bulb 1 formed of a light-transmitting material enclosing a discharge gas inside and having a phosphor coated on the inner wall, and a recess 2 formed in the bulb 1 at the time of manufacture. And a high frequency electromagnetic field generating means 3 for supplying a high frequency electromagnetic field. The high-frequency electromagnetic field generating means 3 is wound around a bobbin 4 made of an insulating material to generate a high-frequency electromagnetic field, and this induction coil 5 is wound around the outer peripheral surface. A cylindrical core 6 made of Zn ferrite and a first radiator 7 that holds the core 6 and radiates heat generated in the core 6 are provided. In the present invention, the first radiator 7 The second heat dissipating body 8 acting to enhance the heat dissipating action is provided.

  In the present embodiment, the first radiator 7 is a metal cylinder having a flange at the lower end, and is made of, for example, aluminum or copper having high thermal conductivity or an alloy thereof, and the cylinder is open at the lower end of the bobbin 4. Is inserted from. A flange portion is formed at the lower end of the bobbin 4. As the second heat radiating body 8, a spirally wound spring member 8 a that is inserted into the core 6 and the substantially linear portion in the axial direction in the outside of the core 6 is used. As a material of the spring member 8a, for example, an alloy mainly composed of aluminum or copper is used. An exhaust thin tube 2a hangs down from the axial center of the indented portion 2 of the valve 1, and an exhaust thin tube 2a is disposed in the axial center of the bobbin 4 of the high-frequency electromagnetic field generating means 3 inserted into the indented portion 2. A cavity for insertion is provided.

  As shown in FIG. 1, before the assembly of the apparatus, the diameter of the hollow portion of the cylindrical core 6 is larger than the diameter of the spirally wound spring member 8a. Can be inserted. The spring member 8 a is in a state of being sandwiched between the upper end surface of the bobbin 4 and the upper end surface of the first radiator 7. Here, when the bobbin 4 is moved in the direction of the arrow until the lower end flange of the bobbin 4 and the lower end flange of the first heat dissipating body 7 come into contact with each other, the bobbin 4 is sandwiched between the bobbin 4 and the first heat dissipating body 7. The spirally wound spring member 8a is compressed in the axial direction (vertical direction). As a result, as shown in FIG. 2, after assembly, the spirally wound spring member 8 a spreads in the radial direction and is in close contact with the cavity of the core 6 and the first radiator 7. At this time, the bobbin 4 and the first radiator 7 are fixed by means 9 such as screwing. Further, the bulb 1 and the first radiator 7 are fixed by a base 10.

  Thus, since the spirally wound spring member 8a and the core 6 are brought into close contact with each other, heat generated in the core 6 can be dissipated and the core 6 can be fixed even when the respective dimensions vary. It becomes possible. In addition, the assembly tact is merely inserting the core 6 into the second radiator 8, that is, the spring member 8 a, and compressing the spring member 8 a in the axial direction by the movement of the bobbin 4. No cost is necessary.

  FIG. 3 shows another example of the spring member 8a spirally wound in the first embodiment. The spring member 8a is obtained by spirally winding a ribbon-like band member having a flat surface. By using this, the area that is in close contact with the core 6 when expanded in the radial direction is increased, and the heat dissipation effect of the core 6 can be further enhanced.

  As mentioned above, according to the present Example, the heat dissipation of the core 6 becomes high and the electrodeless discharge lamp apparatus excellent in assemblability can be provided.

  FIG. 4 shows an electrodeless discharge lamp apparatus according to Embodiment 2 of the present invention. A duplicate description of the same configuration as that of the first embodiment is omitted. In the present embodiment, the second heat radiating body 8 for radiating heat from the core 6 includes the extended portion 7a of the first heat radiating body 7 inserted into the core 6, the inside of the core 6, and the first heat radiating. It is comprised from the member 8b which has the high heat conductivity inserted between the extension parts 7a of the body 7, and has a semi-solid or solid-like elasticity.

  Before the bobbin 4 is assembled, the adhesion between the elastic member 8b and the core 6 is poor, but the elastic member 8b is compressed in the axial (vertical) direction by the first radiator 7 and the bobbin 4. As shown in FIG. 4, the elastic member 8 b extends in the radial direction and is in close contact with the cavity of the core 6 and the first radiator 7. At this time, the bobbin 4 and the first radiator 7 are fixed by means 9 such as screws. Since the elastic member 8b and the core 6 are in close contact with each other, by using the elastic member 8b and the first heat radiating member 7 that have high thermal conductivity, the core 6 can be dissipated, and the core 6 It can be fixed.

  As described above, the electrode 6 can be provided with an electrodeless discharge lamp device having high heat dissipation and excellent assemblability, and the elastic member 8b is inserted into the core 6, so that the core 6 is mechanical. It is possible to reduce the possibility of breakage.

  FIG. 5 shows an electrodeless discharge lamp apparatus according to Embodiment 3 of the present invention. A duplicate description of the same configuration as that of the embodiment already described is omitted. In the present embodiment, unlike the first embodiment, the second heat radiating body 8 has a spring member 8a wound in a spiral shape inserted into the core 6 and the substantially linear portion in the axial direction inside and outside the core 6, and elasticity. It is comprised by the member 8b.

  As shown in FIG. 5, the elastic member 8b is inserted between the inside of the core 6 and the spring member 8a spirally wound, so that in addition to the same effects as in the first embodiment, the spring member Since 8a does not touch the core 6 directly, possibility that the core 6 will be damaged mechanically can be reduced.

  FIG. 6 shows a no-dragon pole discharge lamp device according to Embodiment 4 of the present invention. A duplicate description of the composition similar to the embodiment already described will be omitted. In the present embodiment, unlike the first embodiment, the spirally wound spring member 8 a inserted in the substantially straight portion in the axial direction inside the core 6 and outside the core 6 is more external to the core 6 than inside the core 6. The diameter of the substantially straight line portion in the axial direction is increased. As a result, the core 6 is held by the spring member 8 a inside the core 6 in the radial direction and the spring member 8 a outside the core 6 in the axial direction. Therefore, in addition to the same effects as in the first embodiment, the core 6 can be fixed in the axial direction with the spring member 8a wound in a spiral shape, so that the first heat radiator 7 can be configured with only the bottom portion. The first heat radiator 7 can have a simple structure.

  The present invention is not limited to the configuration of the above embodiment, and various modifications can be made without departing from the spirit of the invention.

FIG. 3 is a structural diagram of high-frequency electromagnetic field generating means of the non-dragon pole discharge lamp device before assembly according to Embodiment 1 of the present invention. FIG. 2 is a structural diagram of the apparatus after assembly according to Embodiment 1 of the present invention. FIG. 6 is a perspective view showing another example of the spring member of the device according to Embodiment 1 of the present invention. FIG. 6 is a structural diagram of the apparatus according to Embodiment 2 of the present invention. FIG. 6 is a structural diagram of this apparatus according to Embodiment 3 of the present invention. FIG. 6 is a structural diagram of this apparatus according to Embodiment 4 of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve 2 Indentation part 3 High frequency electromagnetic field generation means 4 Bobbin 5 Induction coil 6 Core 7 1st heat radiating body 8 2nd heat radiating body 8a Spring member 8b Elastic member

Claims (4)

It is formed of a translucent material encapsulating a discharge gas inside, a phosphor is applied to the inner wall, a bulb having a hollow portion, an induction coil for supplying a high frequency electromagnetic field to the bulb, and provided inside the induction coil A cylindrical core, and a high-frequency electromagnetic field generating means that includes a first heat radiator that holds and dissipates heat generated in the core, and the high-frequency electromagnetic field generating means includes the indented portion. In an electrodeless discharge lamp device arranged in
A second radiator that is located in the inner wall of the core, expands in a radial direction when compressed in the axial direction, and is adjacent to the inner wall of the core and the first radiator;
2. An electrodeless discharge lamp device according to claim 1, wherein the second heat radiator is compressed in the axial direction by assembling the device.   The second heat radiator is a spring member wound in a spiral and an elastic member, and the elastic member is provided between the spiral wound spring member and the core. The electrodeless discharge lamp apparatus according to claim 1, wherein A bobbin for winding the induction coil on the outside of the core;
The electrodeless discharge lamp device according to claim 1 or 2, wherein the second heat radiating body is compressed in the axial direction by the bobbin and the first heat radiating body. The second heat dissipator of the previous period includes a spring member wound in a spiral shape, and the spring member wound in a spiral shape is provided inside the core and outside in the axial direction thereof,
The outside diameter of the core is larger than the inside of the core,
The electrodeless discharge lamp device according to any one of claims 1 to 3, wherein the core has a radial direction held by the inner core and an axial center direction held by the outer core.

Images