JP4966818B2 - Lighting equipment with electrodeless discharge lamp - Google Patents

Description

  The present invention relates to a luminaire including an electrodeless discharge lamp such as a fluorescent lamp or a germicidal lamp that excites and emits a discharge gas sealed in a loop-shaped bulb by electromagnetic induction.

  2. Description of the Related Art Conventionally, an electrodeless discharge lamp that emits and emits a discharge gas sealed in a bulb by electromagnetic induction is known. In addition, as an electrodeless discharge lamp, there are a lamp using a spherical bulb and a lamp using a loop bulb. In the case of using a bulb having a spherical shape, the output up to 2000 Lm (about 200 W) is set as the upper limit because of the problem that the size of the bulb is too large. However, when a loop-shaped bulb is used, there is an advantage that an induced electric field is supplied using a core having a closed magnetic circuit in order to generate discharge in the bulb. For this reason, the electrical characteristics do not change even when a conductor is close to the lamp periphery or when a plurality of conductors are used side by side. As a result, by using an electrodeless discharge lamp using a loop-shaped bulb, it is possible to realize a lighting apparatus capable of high output of 2000 Lm (about 200 W) or more.

As an electrodeless discharge lamp using such a loop-shaped bulb, for example, a loop-shaped bulb filled with discharge gas, a ring-shaped core through which this bulb is inserted, an induction coil wound around the core, A device including a lighting circuit including a high-frequency power source and connected to a coil and a base for supplying power has been proposed (see Patent Document 1).
JP 2003-109548 A

  However, in the thing of this patent document 1, since a loop-shaped valve | bulb acts like an antenna, electromagnetic noise generate | occur | produces and the electromagnetic noise is mainly from one side of the valve to the other side. From the through hole formed by the bulb inside the bulb so as to penetrate through the bulb, the light is emitted in the direction of the central axis of the through hole. Therefore, there is a problem that it is difficult to actually use. When a spherical valve is used, the electromagnetic noise is less and the practicality is higher than in the case of the loop valve described above. However, as described above, it is difficult to achieve a high output exceeding 2000 Lm. It is.

  An object of the present invention is to provide a luminaire provided with an electrodeless discharge lamp that emits less electromagnetic noise and is capable of high output.

  In order to solve the above-mentioned problem, according to claim 1 of the present invention, an induction coil is wound around a ring-shaped core through which a loop-shaped valve is inserted, and a high-frequency current is passed through the wound induction coil. A lighting fixture including an electrodeless discharge lamp that excites and emits discharge gas sealed in the bulb by electromagnetic induction, and is disposed inside the bulb so as to penetrate from one side of the bulb to the other side. Provided is a luminaire provided with an electrodeless discharge lamp, characterized in that a conductive umbrella is provided so as to cover a through hole defined by a bulb from both sides thereof. It is.

  According to a second aspect of the present invention, an electric lamp holding member is provided on one end side in the axial direction of the umbrella body, and the electrodeless discharge lamp is connected so that the core and the umbrella body can transfer heat. And is preferably held by the lamp holding member.

  According to a third aspect of the present invention, it is preferable that a plurality of the electrodeless discharge lamps are provided, and the bulbs of the electrodeless discharge lamp are arranged so that the through holes face each other.

  According to a fourth aspect of the present invention, the electrodeless discharge lamp has n pieces (n is an integer of 3 or more), and each of the bulbs of the electrodeless discharge lamp has a substantially regular n-square column by a plane including the axis of the bulb. It is preferable to be arranged so as to form.

  According to a fifth aspect of the present invention, a plurality of the electrodeless discharge lamps are provided, and the plurality of electrodeless discharge lamps are provided in each induction coil so as to cause a shift in the phase of electromagnetic noise generated from each bulb. It is preferable that the current is applied.

  According to the first aspect of the present invention, an electrodeless discharge lamp having an induction coil wound around a ring-shaped core through which a loop-shaped bulb is inserted is used, so that higher output is possible than when a spherical bulb is used. Can be anything.

  In addition, in order to arrange the conductive umbrella so as to cover the through hole formed inside the valve so as to penetrate from one side of the valve to the other side, from both sides thereof, Electromagnetic noise radiated from the through hole to both sides can be absorbed by the umbrella. Thereby, radiation of electromagnetic noise can be suppressed, and the radiation of electromagnetic noise can be reduced.

  According to claim 2, since the electrodeless discharge lamp is held on the lamp holding member provided on one side in the axial direction of the umbrella body so as to connect the core and the umbrella body so that heat can be transferred, Heat generated from the core can be released from the umbrella, and heat dissipation can be promoted.

  According to the third aspect, since the bulbs of the electrodeless discharge lamp are arranged so that the through holes face each other, the electromagnetic noises generated from the bulbs cancel each other and attenuate, thereby weakening the electromagnetic noise. it can. Thereby, electromagnetic noise can be suppressed more efficiently.

  According to the fourth aspect of the present invention, each of the n electrodeless discharge lamp bulbs is arranged so as to form a substantially n-shaped prism by a plane including the bulb axis. Noises can cancel each other and attenuate to weaken electromagnetic noise. Thereby, electromagnetic noise can be suppressed more efficiently.

  According to the fifth aspect of the present invention, since the n electrodeless discharge lamps have a current applied to each induction coil so as to shift the phase of the electromagnetic noise generated from each bulb, the electromagnetic noise generated from each bulb. Cancel each other and attenuate, further reducing electromagnetic noise. Thereby, electromagnetic noise can be suppressed more efficiently.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic view of a lighting fixture including the electrodeless discharge lamp of the first embodiment, and FIG. 2 is a plan view of FIG.

  A lighting fixture 100 including an electrodeless discharge lamp according to the present invention includes an electrodeless discharge lamp 1, a lighting fixture body 10, and an attachment member 5 to which the electrodeless discharge lamp 1 and the noise absorbing member 10 are attached. ing.

  The electrodeless discharge lamp 1 includes a bulb 2, a coupler unit 3, and an induction coil 4. The bulb 2 is made of a tubular material made of a light-transmitting material such as glass. The valve 2 of this embodiment has a pair of first straight pipe portion 21 and second straight pipe portion 22 that are substantially straight and arranged in parallel, and shorter in length than the straight pipe portions 21 and 22. It is composed of a pair of U-shaped (curved) first curved tube portion 23 and second curved tube portion 24, and the overall shape is a closed loop shape (closed loop shape). The length in the up-down direction is longer than the length in the left-right direction.

  Further, one side of the valve 2 is placed inside the valve 2 so as to be surrounded by the first straight pipe portion 21, the second straight pipe portion 22, the first bent tube portion 23, and the second bent tube portion 24. An elongated through-hole 9 is formed so as to penetrate from the side (front side in the figure) to the other side side (rear side in the figure). The first bending tube portion 23 is provided with a coldest portion 25.

  Although not shown, a fluorescent material is applied to the inner surface of the bulb 2. The bulb 2 is filled with a discharge gas such as an inert gas or metal vapor. Examples of the inert gas include neon, argon, krypton, and xenon. Examples of the metal vapor include mercury, sodium, cadmium, and zinc.

  The coupler unit 3 includes a first core 31 and a second core 32 that have two identical configurations. The first core 31 and the second core 32 are made of a ferrite material (MnZn). The first core 31 and the second core 32 are formed in a ring shape having a hole 33 having a diameter larger than the diameters of the first straight pipe portion 21 and the second straight pipe portion 22 of the valve 2.

  The first core 31 configured as described above is configured such that the first straight pipe portion 21 of the valve 2 is inserted into the hole 33 so that one end side of the first straight pipe portion 21 in the valve 2 (see FIG. 1). (On the lower end side). On the other hand, the second core 32 is disposed on one end side of the second straight pipe portion 22 so that the second straight pipe portion 22 is inserted into the hole 33.

  The induction coil 4 is wound around a part of each of the first core 31 and the second core 32. Note that the number of windings and the winding direction of the induction coil 4 are set so that discharge can be generated and maintained in the bulb 2.

  The luminaire main body 10 includes an umbrella body 11, a lamp holding member 15 (shown in FIG. 2) that holds the electrodeless discharge lamp 1 disposed on one end side (lower side in FIG. 1) of the umbrella body 11, The electrode discharge lamp 1 is provided with a lighting mechanism 12 disposed on the lower side of the figure.

  The umbrella body 11 is made of a metal conductive material such as aluminum or iron, and gradually increases in diameter toward the upper side (the other end side) of FIG. 1 and has a light irradiation port 14 at the upper end thereof. ing. Further, the inner surface of the umbrella body 11 of this embodiment receives light from the bulb 2 and reflects it to the light irradiation port 14 side, and absorbs electromagnetic noise generated from the bulb 2.

  In FIG. 1, for convenience of explanation, the inner electrodeless discharge lamp 1 is shown through the umbrella body 11, but the umbrella body 11 is opaque, and actually the electrodeless electrode inside the umbrella body 11. The discharge lamp 1 is covered with an umbrella body 11 (the same applies to FIGS. 3, 4, and 7 described later, and the same applies to a casing 12a described later).

  The lamp holding member 15 is made of a metal plate. The lamp holding member 15 is fixed to the inner peripheral wall of the cylindrical casing 12a integrally extending from the umbrella 11 on the lower side of the figure by fixing means such as bolts so that the left and right ends thereof are in contact with each other. It is fixed.

  The lighting mechanism unit 12 includes a lighting circuit 16 that includes a high-frequency power source and is connected to the induction coil 4, and further includes a power cord (not shown).

  Next, the attachment member 5 will be described. The attachment member 5 of this embodiment is composed of two metal plate-like elastic members, an attachment main body piece 51 and a sandwiching piece 52. The attachment main body piece 51 is substantially U-shaped, and holds the first core 31 and the second core 32 on the inner peripheral side.

  Both ends of the sandwiching piece 52 are locked to the mounting body piece 51 that holds the first core 31 and the second core 32, and upon the locking, the first core 31 and the second core 32 are pressed, The first core 31 and the second core 32 are sandwiched between the attachment main body piece 51 and the sandwiching piece 52.

  In the mounting member 5 configured as described above, the fixing pieces 53 provided on both ends of the mounting body piece 51 are fixed to the lamp holding member 15 with the first core 31 and the second core 32 sandwiched therebetween. 7 (not shown), and by this fixing, the electrodeless discharge lamp 1 is held by the lamp holding member 15 of the luminaire body 10.

  In this holding state, the longitudinal direction of the bulb 2 of the electrodeless discharge lamp 1 substantially coincides with the axial direction of the umbrella body 13, and the inside of the bulb 2 is moved from one side of the bulb 2 to the other side. The through hole 9 defined by the valve 2 so as to penetrate through both sides thereof, ie, both sides in the central axis direction (XX in FIG. 2) of the through hole 9 from the upper end to the lower end of the through hole 9 It is in the state covered with the umbrella body 13 over.

  When a voltage is applied to the induction coil 4 of the electrodeless discharge lamp 1 from the lighting mechanism portion 12 of the luminaire main body 10, the lighting fixture 100 configured as described above has an electromagnetic field around the induction coil 4 due to the voltage. Is generated and a magnetic field is formed. The magnetic field also generates a closed loop electric field in the bulb 2. This electric field generates a discharge in the bulb 2 and causes a discharge current to flow, whereby the bulb 2 is lit.

  At that time, radiation noise is generated from the bulb 2 and is radiated mainly in the direction of the central axis of the through hole 9 (XX in FIG. 2). However, since both sides in the central axis direction are covered with the umbrella body 13, radiation noise strikes the umbrella body 13 and is absorbed. Of the light from the bulb 2, the light irradiated in the direction of the umbrella body 13 strikes the umbrella body 13, is reflected to the light irradiation port 14 side, and is irradiated forward from the light irradiation port 14. Thereby, radiation noise is absorbed and weakened by the umbrella 13, and the light from the bulb 2 can be efficiently irradiated.

  Further, the first core 31 and the second core 32 of the electrodeless discharge lamp 1 and the metal umbrella 13 are provided with a metal attachment member 5, a metal lamp holding member 15, and a metal casing 12a. Therefore, the heat generated in the first core 31 and the second core 32 can be effectively radiated from the umbrella body 13.

  In addition, in the said 1st Embodiment, while providing the two 1st cores 31 and the 2nd cores 32, the electrodeless discharge lamp 1 is being fixed to the lighting fixture main body 10 with the two attachment members 5 holding them. However, the present invention is not limited to this configuration. For example, as shown in FIG. 3, only one core 131 is provided, and the electrodeless discharge lamp 1 is fixed to the luminaire main body 10 by one mounting member 5 that holds the core 131. Alternatively, it may be configured by providing three or more cores and attachment members, and can be changed as appropriate.

  Next, 2nd Embodiment is described based on FIGS. The lighting apparatus 200 according to the second embodiment includes two electrodeless discharge lamps 201.

  The luminaire main body 10 includes two lamp holding members 215 that hold the electrodeless discharge lamp 201, respectively. Each electrodeless discharge lamp 201 in the second embodiment has the same configuration as that of the first embodiment.

  Each of the electric lamp holding members 215 has substantially the same configuration as that of the first embodiment, and is attached in a state of being in contact with the inner peripheral wall of the casing 12a so as to be arranged substantially in parallel in the casing 12a. It has been.

  And the electrodeless discharge lamp 201 is hold | maintained through these attachment members 5 similarly to said 1st Embodiment, respectively to these electric lamp holding members 215. In this holding state, the through holes 9 formed inside the bulbs 2 of the two electrodeless discharge lamps 201 face each other and overlap each other. The rest of the third embodiment has the same configuration as that of the first embodiment.

  In the lighting fixture 200 of the second embodiment configured as described above, radiation noise is generated from each bulb 2, and the direction of the central axis of the through hole 9 formed mainly inside each bulb 2 (X in FIG. 5). In this case, since the through holes 9 are opposed to each other, the electromagnetic noises generated from the valve 2 cancel each other and are attenuated to weaken the electromagnetic noise. As a result, the intensity of electromagnetic noise generated from each valve 2 can be reduced to twice or less, and electromagnetic noise can be suppressed more efficiently.

  In the second embodiment, two electrodeless discharge lamps 201 are provided. However, three or more electrodeless discharge lamps 201 may be provided. Specifically, for example, as shown in FIG. 6, three electrodeless discharge lamps 201 are arranged so that the through holes 9 formed inside the respective bulbs 2 are aligned.

  Further, in the second embodiment, it is preferable that the electrodeless discharge lamps 201 are alternately arranged so that the directions of the discharge currents flowing in the bulbs 2 are reversed. In particular, the electrodeless discharge lamps 201 are composed of an even number of electrodeless discharge lamps 201. Preferred in some cases.

  By doing so, electromagnetic noise generated from the bulbs 2 of the two electrodeless discharge lamps 201 adjacent to each other can be made to have opposite phases that are 180 ° out of phase with each other, and the electromagnetic noises generated from the bulbs 2 cancel each other out. Can be attenuated and electromagnetic noise can be reduced. The direction of the discharge current flowing through the bulb 2 can be set according to the winding direction of the induction coil 4 or the direction of the current flowing through the induction coil 4.

  Next, 3rd Embodiment is described based on FIG. 7, FIG. The lighting apparatus 300 according to the third embodiment includes three electrodeless discharge lamps 301.

  The luminaire main body 10 includes three lamp holding members 315 that hold the electrodeless discharge lamps 301, respectively. Each electrodeless discharge lamp 301 in the third embodiment has the same configuration as that of the first embodiment.

  Each of the lamp holding members 315 has substantially the same configuration as that of the first embodiment. And in this 3rd Embodiment, the electric lamp holding member 315 is attached in the state contact | abutted to the inner peripheral wall of the casing 12a so that the angle | corner which adjacent things make becomes the same.

  And the electrodeless discharge lamp 301 is hold | maintained via these attachment members 5 similarly to said 1st Embodiment, respectively in these electric lamp holding members 315. In this holding state, the three electrodeless discharge lamps 301 have the same interior angle α formed by the planes 2b including the axis 2a of each bulb 2, and a substantially triangular prism is formed by these planes 2b. It is arranged. The rest of the third embodiment has the same configuration as that of the first embodiment.

  In the luminaire 300 of the third embodiment configured as described above, radiation noise is generated from each bulb 2, and the direction of the central axis of the through hole 9 formed mainly inside each bulb 2 (X in FIG. 2). In this case, the central axis of the through-hole 9 is concentrated at one point, so that electromagnetic noise generated from the valve 2 cancels each other and attenuates to weaken the electromagnetic noise. As a result, the intensity of electromagnetic noise generated from each valve 2 can be reduced to three times or less, and electromagnetic noise can be suppressed more efficiently.

  In the third embodiment, three electrodeless discharge lamps 301 are provided. However, four or more electrodeless discharge lamps 301 may be provided. Specifically, the electrodeless discharge lamp 301 is composed of n pieces (n is an integer of 3 or more). Then, an internal angle α formed by a plane including the axes of two adjacent bulbs is set to 180 ° − (360 ° / n) so that a substantially n-shaped prism is formed by these planes. By doing so, the electromagnetic noises gathered at one central axis of the through-holes formed inside each valve, and the electromagnetic noises generated from the valves 2 cancel each other and are attenuated to weaken the electromagnetic noise.

  In the third embodiment, it is preferable to apply a current to each induction coil so that the n electrodeless discharge lamps arranged side by side cause a shift in the phase of electromagnetic noise generated from each bulb. For example, a current is applied to the induction coil so that n number of electrodeless discharge lamps arranged so as to form a substantially positive n prism by the plane are sequentially shifted by 360 ° / n.

  By doing so, the synthetic electromagnetic field formed in the valve 2 can be made almost zero, and the electromagnetic noise can be further weakened. The phase can be shifted, for example, by sequentially delaying the timing of applying current to the n electrodeless discharge lamp induction coils by the control means.

  In the second embodiment, a current may be applied to each induction coil so that the phase of the electromagnetic noise is shifted in this way, so that the electromagnetic noise generated from the valve 2 cancels each other. Attenuates and weakens electromagnetic noise.

  In the first to third embodiments, the inner surface of the umbrella body 11 has a gradually increasing diameter as it goes to the one end side in the axial direction, and has a curved surface curved to one end side in the axial direction. However, for example, the inner surface of the umbrella body 11 may be a tapered surface whose diameter gradually increases toward one end side in the axial direction. Moreover, although the cross-sectional shape perpendicular to the axial direction on the inner surface of the umbrella body 11 is formed in a circular shape in the above embodiment, it may be a polygonal shape and can be changed as appropriate.

It is a schematic perspective view of the lighting fixture provided with the electrodeless discharge lamp of 1st Embodiment of this invention. It is a top view of FIG. In 1st Embodiment, it is a schematic perspective view of the lighting fixture using the other electrodeless discharge lamp. It is a schematic perspective view of the lighting fixture provided with the electrodeless discharge lamp of 2nd Embodiment of this invention. FIG. 5 is a plan view of FIG. 4. In 2nd Embodiment, it is a top view at the time of using three electrodeless discharge lamps. It is a schematic perspective view of the lighting fixture provided with the electrodeless discharge lamp of 3rd Embodiment of this invention. FIG. 8 is a plan view of FIG. 7.

Explanation of symbols

100, 200, 300 Lighting fixture 1, 201, 301 Electrodeless discharge lamp 4 Inductive coil 11 Umbrella 31, 32 Core

Claims (5)

An induction coil is wound around a ring-shaped core through which a loop-shaped bulb is inserted, and a high-frequency current is passed through the wound induction coil so that the discharge gas sealed in the bulb is excited and emitted by electromagnetic induction. A luminaire comprising an electrode discharge lamp,
A conductive umbrella disposed so as to cover the through hole defined by the valve inside the valve so as to penetrate from one side of the valve to the other side. A luminaire provided with an electrodeless discharge lamp, characterized in that a body is provided. On one end side in the axial direction of the umbrella, a lamp holding member is provided,
2. The electrodeless discharge lamp according to claim 1, wherein the electrodeless discharge lamp is held by the lamp holding member such that the core and the umbrella are connected so as to be able to transfer heat. Lighting equipment. A plurality of electrodeless discharge lamps,
The lighting apparatus according to claim 1 or 2, wherein the bulbs of the electrodeless discharge lamp are arranged so that the through holes face each other. The electrodeless discharge lamp has n pieces (n is an integer of 3 or more). The bulbs of the electrodeless discharge lamp are respectively arranged so as to form a substantially n-square column by a plane including the bulb axis. The luminaire according to claim 1 or 2, wherein A plurality of electrodeless discharge lamps,
The plurality of electrodeless discharge lamps are configured such that a current is applied to each induction coil so as to cause a shift in the phase of electromagnetic noise generated from each bulb. The lighting fixture as described in any one of 4.

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