JP2009205831A - Retaining tool for electrodeless lamp, and illumination fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a retaining tool for an electrodeless lamp and an illumination fixture in which a temperature of a protruding part for the coldest point of the electrodeless lamp housed in a frame body is hard to rise, and there is less possibility of damaging characteristics of light output. <P>SOLUTION: The illumination fixture 1 is equipped with: an electrodeless lamp 2 equipped with a light-bulb like bulb which has the protruding part 27 for the coolest point at a top part, and in which a discharge gas is sealed, the retaining tool 3 for the electrodeless lamp having a reflecting umbrella 32 and a first panel 33, and a lighting circuit 4. The first panel 33 is equipped with an outside air introducing hole 34. The reflecting umbrella 32 is equipped with an exhaust hole 35. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to an electrodeless lamp holder and a lighting fixture for holding an electrodeless lamp having a bulb having a coldest point projection and a discharge gas sealed therein.

2. Description of the Related Art Conventionally, electrodeless lamps having a bulb filled with a discharge gas are widely known. As this electrodeless lamp, for example, a mercury drop is used, and a projection for the coldest spot is provided in a part of the bulb so that the mercury vapor pressure is controlled so as not to impair the characteristics of light output (Patent Document 1). reference).
JP 2001-325920 A

  However, when an electrodeless lamp having a bulb having such a cold spot projection is housed in the frame, there are the following problems. That is, due to the heat generated by the light emission of the electrodeless lamp, the temperature inside the frame rises, and the temperature of the cold spot projection of the electrodeless lamp housed in the frame rises. As a result, there is a possibility that a good light quantity of the electrodeless lamp cannot be obtained.

  It is an object of the present invention to provide a holder for an electrodeless lamp and a lighting fixture in which the temperature of the projection for the coldest spot of the electrodeless lamp housed in a frame is unlikely to increase and the characteristics of light output are less likely to be impaired. It is what.

  In order to solve the above-mentioned problem, claim 1 of the present invention provides an electrodeless lamp having a light bulb-like bulb having a coldest point protrusion protruding on the outer peripheral side and in which a discharge gas is enclosed. A holder for an electrodeless lamp that is housed and held in a frame body, wherein the frame body is provided with an outside air introduction hole and an exhaust hole that are opened so as to communicate between the outside and the frame body. An electrodeless lamp holder is provided.

  According to a second aspect of the present invention, the electrodeless lamp is housed in the frame so that the coldest spot projection is on the lower side, and the frame is opposed to the coldest spot projection. A first panel having translucency disposed on the casing and a housing holding the first panel, and the outside air introduction hole is formed in the vicinity of the lowermost portion of the projection for the coldest spot in the first panel. The exhaust hole is preferably formed in a part of the casing.

  As in claim 3, the housing is supported by a casing that houses a lighting circuit that supplies a high-frequency power to the electrodeless lamp and lights it, and includes a partition wall that partitions the casing from the frame body, The exhaust hole is preferably formed in the partition wall so as to communicate the casing and the frame body.

  As in claim 4, a second panel is provided on the lower side of the first panel at a distance from the first panel, and the housing holds the second panel at the lower end thereof. A void portion is defined by the second panel, the first panel, and the housing, and the second panel or the housing is provided with an outside air introduction hole for the void portion that is opened so as to communicate with the outside and the void portion. It is preferable that

  Moreover, in order to solve the said subject, Claim 5 of this invention is hold | maintained at the electrodeless lamp holder as described in any one of the said Claims 1-4, and the electrodeless lamp holder. In addition, the present invention provides a lighting fixture comprising the electrodeless lamp.

  According to the first aspect of the present invention, the frame body is provided with the outside air introduction hole and the exhaust hole which are opened so as to communicate the outside and the frame body. As a result, when the temperature inside the frame starts to rise due to the heat generated by the light emission of the electrodeless lamp, the air in the frame that has risen in temperature can be discharged from the exhaust hole to the outside, and the outside air can be discharged from the outside air introduction hole into the frame. Can be introduced. Therefore, it is difficult to increase the temperature in the frame body, and it is possible to suppress an increase in the temperature of the projection for the coldest spot of the valve. Therefore, it is possible to suppress a decrease in light output due to a change in the pressure of mercury vapor contained in the discharge gas.

  According to the second aspect, since the outside air introduction hole is formed in the vicinity of the lowermost portion of the projection for the coldest spot in the first panel, when the outside air flows from the outside air introduction hole to the exhaust hole, the outside air is sent to the coldest spot. It can be easily applied to the projection. Thereby, the temperature rise of the protrusion part for the coldest spot of a valve | bulb can be suppressed more reliably.

  According to the third aspect of the present invention, since the exhaust hole is formed so as to communicate with the partition wall that partitions the inside of the casing and the frame body, the outside air introduced from the outside air introduction hole is transferred from the exhaust hole to the casing. Can flow inside. Thereby, a lighting circuit can also be cooled and the temperature rise of a lighting circuit can be suppressed. Therefore, it is highly possible to use various circuit elements that are difficult to use due to a high temperature rise.

  According to the fourth aspect, since the second panel is provided on the lower side of the first panel at a distance from the first panel, even if the valve is broken, for example, the broken piece may be scattered outside. Can be made less.

  According to the fifth aspect of the present invention, there is provided a lighting fixture in which the temperature inside the frame does not easily rise due to heat generated by light emission of the electrodeless lamp, and the temperature of the projection for the coldest spot is suppressed from being increased and the light output characteristics are not deteriorated. it can.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a lighting fixture having the electrodeless lamp holder of the first embodiment, and FIG. 2 is an enlarged cross-sectional view of the electrodeless lamp used in the lighting fixture.

  The lighting fixture 1 having the electrodeless lamp holder according to the first embodiment includes an electrodeless lamp 2, an electrodeless lamp holder 3, and a lighting circuit 4 as shown in FIG.

  As shown in FIG. 2, the electrodeless lamp 2 includes a glass bulb-shaped bulb 21. The base end 21 a in the axial direction of the valve 21 is connected to the base 23. The central axis of the bulb 21 has a cavity 24 formed so as to be recessed from the proximal end side toward the distal end side in the axial direction, and an exhaust thin tube extending from the bottom portion 24a of the cavity 24 toward the opening portion 24b. 25 are integrally formed.

  In the cavity 24, a cylindrical cylinder 26 inserted in the exhaust thin tube 25 is provided. The cylinder 26 constitutes a part of the coupler 28 that is electrically connected to the lighting circuit 4, protrudes to the outside from the opening 24 b of the cavity 24, and is fitted into a hole formed in the base 23.

  The coupler 28 is fitted to the base 23 and is connected to a plate-like heat radiating plate 30 provided on the base end side of the electrodeless lamp 2.

  Although not shown, two layers of a protective film and a phosphor film are formed on the inner surface of the bulb 21. Also, two layers of a protective film and a phosphor film are formed on the peripheral surface of the cavity 24 in the bulb 21.

  In addition, a ferrite core 29 and an induction coil 20 are provided in the upper portion of the cavity 24 so as to be fitted on the outer periphery of the cylinder 26. The ferrite core 29 is necessary because the high-frequency current that flows through the induction coil 20 has a low frequency of several hundred KHz.

  A discharge gas such as an inert gas or mercury is enclosed in the bulb 21. Examples of the inert gas include neon, argon, krypton, and xenon. Further, in the exhaust thin tube 25 of this embodiment, a total amount of about 20 mg and a weight ratio of 50:50 zinc / mercury compound is accommodated so that mercury can be released into the valve 21.

  A coldest point protrusion 27 is provided at the tip end 21 b in the axial direction of the bulb 21. The coldest spot projection 27 is formed as a part constituting the coldest spot having the lowest temperature inside the bulb 21 when the lamp 2 is lit with the ambient temperature of the lamp 2 being constant. The valve 21 protrudes from the top end of the valve 21 toward the outer peripheral side in the axial direction. Further, the coldest spot projection 27 of this embodiment is formed in a conical shape with a gradually decreasing diameter as it goes to the tip.

  As shown in FIGS. 1 and 3, the electrodeless lamp holder 3 includes a frame. Further, the frame body includes a reflective shade 32 as a housing, and a first panel 33 having translucency disposed on the lower surface side of the reflective shade 32.

  The reflection shade 32 is open on the lower surface side. Further, the reflecting shade 32 of the first embodiment is formed such that the opening diameter gradually increases as it goes downward.

  An exhaust hole 35 is provided on the upper side of the reflecting shade 32. This exhaust hole 35 is for letting out air in a lamp housing portion 31 (described later) formed inside the reflecting shade 32 from the lamp housing portion 31 to the outside, and is opened so as to penetrate from the inner surface of the reflecting shade 32 to the outer surface. It has been. Thus, the exhaust hole 35 communicates with the outside from the lamp housing portion 31.

  In this embodiment, four exhaust holes 35 are provided in the circumferential direction, each of which is formed of a circular shape having a diameter of about 30 mm.

  In this embodiment, the reflection shade 32 formed in this way is held at the heat dissipation plate 30 of the electrodeless lamp 2 at its upper end, and the light of the electrodeless lamp 2 housed inside is directed to the opening side. It can be reflected and guided downward.

  The first panel 33 constitutes a facing wall that faces the coldest point projection 27 of the bulb 21, and an outside air introduction hole 34 is provided at the center thereof. In this embodiment, the outside air introduction hole 34 has a diameter of about 30 mm and is formed so as to penetrate from the upper surface to the lower surface of the first panel 33. Accordingly, the outside air introduction hole 34 is disposed almost directly below the coldest spot projection 27 and faces the coldest spot projection 27.

  The first panel 33 is attached to the lower end of the reflective shade 32 so as to close the opening of the reflective shade 32. In addition, by mounting the first panel 33, the first panel 33 and the reflective shade 32 form a substantially sealed lamp housing portion 31 that houses the electrodeless lamp 2. Further, the outside air introduction hole 34 communicates the lamp housing portion 31 with the outside.

  The lighting circuit 4 is for generating a high-frequency current and supplying the generated high-frequency current to the electrodeless lamp 2. The lighting circuit 4 is disposed in the lighting circuit housing portion 42 of the casing 41 having the lighting circuit housing portion 42 therein. Has been.

  The casing 41 includes a plurality of elongated window holes (shown in FIG. 1) in the circumferential direction on the peripheral wall. The casing 41 holds the electrodeless lamp 2 at its lower end. In this embodiment, the electrodeless lamp 2 is held by attaching the heat sink 30 of the electrodeless lamp 2 to the lower end of the casing 41.

  Thereby, the lighting circuit storage part 42 in the casing 41 and the lamp storage part 31 in the frame body are partitioned by the heat sink 30. Therefore, the heat sink 30 of this embodiment forms a partition wall that partitions the lighting circuit storage portion 42 and the lamp storage portion 31.

  And the lighting circuit 4 arrange | positioned in the casing 41 is electrically connected with the electrodeless lamp 2, and can supply a high frequency current to the electrodeless lamp 2. FIG.

  The lighting fixture 1 of this embodiment configured as described above is mounted so as to be suspended from a ceiling, for example, and is used in a state where the axial direction of the bulb 21 is substantially aligned with the vertical direction. The lighting fixture 1 is not limited to the one suspended from the ceiling. For example, the lighting fixture 1 is inserted into a mounting hole provided in the ceiling from the lower side, and the lower end side of the reflective shade 32 is fixed to the ceiling. It can also be used and can be changed as appropriate.

  In this state, when a high-frequency current is passed from the lighting circuit 4 to the induction coil 20 (see FIG. 2) of the electrodeless lamp 2, an induction electric field (high-frequency electromagnetic field) is generated around the induction coil 20. Plasma is generated by applying this induced electric field to the bulb 21, and ultraviolet rays generated from mercury atoms are converted into visible light by the phosphor film of the bulb 21 and pass through the bulb 21. The light is transmitted through the first panel 33 directly or through the reflective shade 32 and is emitted downward.

  At this time, if the temperature inside the lamp housing 31 rises due to heat generated by the light emission of the electrodeless lamp 2, the air inside the lamp housing 31 comes out from the exhaust hole 35 and the outside air flows from the outside air introduction hole 34. It is introduced into the lamp housing 31. Thereby, the temperature rise in the lamp housing part 31 is suppressed, and the temperature rise of the coldest spot projection part 27 of the bulb 21 can be suppressed.

  Further, when the outside air flows from the outside air introduction hole 34 to the exhaust hole 35, the outside air introduction hole 34 is disposed below the coldest point projection 27, so that the outside air is applied to the coldest point projection 27. Can do. Thereby, the temperature rise of the protrusion part 27 for coldest spots can be suppressed more reliably.

  Therefore, it is possible to suppress a decrease in light output due to a change in the pressure of the mercury vapor sealed in the bulb 21.

  Further, in the above embodiment, the temperature of the coldest spot projection 27 was 40 ° C., which was lower by about 30 ° C. than that having no outside air introduction hole 34 and exhaust hole 35.

  Next, the lighting fixture 100 which has the holder for electrodeless lamps of 2nd Embodiment is demonstrated. The exhaust hole 35 of the electrodeless lamp holder 3 in the lighting fixture 100 of the second embodiment is formed in the heat radiating plate 30 as a partition wall that partitions the lighting circuit storage portion 42 and the lamp storage portion 31. Others have the same configuration as that of the first embodiment.

  In the second embodiment configured as described above, in addition to the effects of the first embodiment, the outside air introduced from the outside air introduction hole 34 can be further flowed from the exhaust hole 35 to the lighting circuit housing portion 42. Thereby, the lighting circuit 4 can be cooled and the temperature rise of the lighting circuit 4 can be suppressed. Therefore, it is possible to use various circuit elements that are difficult to use due to temperature rise.

  Next, the lighting fixture 200 which has the holder for electrodeless lamps of 3rd Embodiment is demonstrated. In the electrodeless lamp holder 3 in the lighting apparatus 200 of the second embodiment, a second panel 36 that transmits light is provided below the first panel 33.

  In detail, the 2nd panel 36 is comprised from the thing of the substantially the same structure as the 1st panel 33 in this embodiment. However, the second panel 36 does not have the outside air introduction hole 34 unlike the first panel 33.

  The second panel 36 is held at the lower end of the reflective shade 32 so as to be separated from the first panel 33 by a predetermined distance. Thus, a gap 37 is defined by the first panel 33, the second panel 36, and the reflective shade 32 on the lower side of the first panel 33.

  In addition, a space outside air introduction hole 38 is provided in a portion of the reflective shade 32 between the second panel 36 and the first panel 33. The outside air introduction hole 38 for the gap is for entering the outside air into the gap 37 and is formed so as to penetrate from the inner surface of the reflection shade 32 to the outer surface and to communicate the gap 37 with the outside.

  In the third embodiment, the cold spot projection 27 of the electrodeless lamp 2 is disposed in the outside air introduction hole 34 of the first panel 33. The other configuration is the same as that of the first embodiment.

  In the third embodiment configured as described above, when the temperature rises due to heat generated by the light emission of the electrodeless lamp 2, the outside air enters the gap portion 37 through the gap portion outside air introduction hole 38. The outside air that has entered the gap portion 37 is introduced into the lamp housing portion 31 through the outside air introduction hole 34, and the air in the lamp housing portion 31 exits through the exhaust hole 35. Thereby, the temperature rise in the lamp housing part 31 is suppressed, and the temperature rise of the coldest spot projection part 27 of the bulb 21 can be suppressed.

  Further, at this time, since the coldest spot projection portion 27 enters the outside air introduction hole 34, the outside air can be quickly and surely applied to the coldest spot projection portion 27, and more reliably, the coldest spot use point. The temperature rise of the protrusion 27 can be suppressed.

  Further, for example, even when the valve 21 is broken for some reason and the broken piece comes out of the outside air introduction hole 34 of the first panel 33, it can be received by the second panel 36 and can be less likely to be scattered outside.

  In the third embodiment, the exhaust hole 35 is provided in the reflection shade 32. However, the present invention is not limited to this configuration and can be changed as appropriate. For example, as shown in FIG. 6, the exhaust holes 35 may be formed in the heat radiating plate 30.

  Further, in the third embodiment, the gap outside air introduction hole 38 is provided in the reflection shade 32, but may be provided in the second panel 36, for example, and can be changed as appropriate. Further, in the case where the void outside air introduction hole 38 is provided in the second panel 36, the position of the void outside air introduction hole 38 in the second panel 36 is not particularly limited.

  However, if the void outside air introduction hole 38 is provided at a position below the outside air introduction hole 34 in the second panel 36 (directly below), the damaged piece of the valve 21 that has come out of the outside air introduction hole 34 of the first panel 33. However, since there is a high possibility that the air will escape from the outside air introduction hole 38 for the gap portion, it is preferable to dispose it on the side of the outside air introduction hole 34. The above is the description of the third embodiment.

  Note that the outside air introduction hole 34, the exhaust hole 35, and the outside air introduction hole 38 for the gap may be one or more, and can be changed as appropriate. Further, the outside air introduction hole 34, the exhaust hole 35, and the outside air introduction hole 38 for the gap may have a mesh structure. This is preferable in that it can be made difficult for dust and insects to enter.

  Moreover, in the said embodiment, although the lighting fixture 1 is comprised from what was provided with the electrodeless lamp 2, the electrodeless lamp holder 3, and the lighting circuit 4, it is not restricted to the thing of this form, It can be changed as appropriate. For example, the luminaire 1 may be composed of an electrodeless lamp 2 and an electrodeless lamp holder 3 and may be connected to a lighting circuit 4 provided separately from the luminaire 1.

It is a perspective view of the lighting fixture which concerns on 1st Embodiment of this invention. It is an expanded sectional view of the electrodeless lamp used for the lighting fixture of this invention. It is a section explanatory view of the lighting fixture of a 1st embodiment. It is a section explanatory view of the lighting fixture concerning a 2nd embodiment of the present invention. It is sectional explanatory drawing of the lighting fixture which concerns on 3rd Embodiment of this invention. It is a section explanatory view of other embodiments in a 3rd embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,100,300 Lighting fixture 2 Electrodeless lamp 3 Electrodeless lamp holder 21 Bulb 27 Coldest point protrusion 32 Reflective shade (housing)
33 First panel 34 Outside air introduction hole 35 Exhaust hole

Claims (5)

A holder for an electrodeless lamp that houses and holds an electrodeless lamp having a bulb-shaped bulb that has a coldest point protrusion projecting on the outer peripheral side and is filled with a discharge gas. And
The holder for an electrodeless lamp, wherein the frame body is provided with an outside air introduction hole and an exhaust hole which are opened so as to communicate between the outside and the frame body. The electrodeless lamp is housed in the frame so that the coldest spot projection is on the lower side,
The frame includes a light-transmitting first panel disposed so as to face the coldest spot projection, and a housing that holds the first panel.
The outside air introduction hole is formed in the lower vicinity of the protrusion for coldest spot in the first panel,
2. The electrodeless lamp holder according to claim 1, wherein the exhaust hole is formed in a part of the casing. The casing is supported by a casing that houses a lighting circuit that supplies a high-frequency power to the electrodeless lamp and lights it, and includes a partition wall that partitions the casing and the frame body,
3. The electrodeless lamp holder according to claim 2, wherein the exhaust hole is formed in the partition wall so as to communicate the casing and the frame body. A second panel is provided on the lower side of the first panel at a distance from the first panel,
By holding the second panel at the lower end of the casing, a gap is defined by the second panel, the first panel, and the casing.
4. The electrodeless lamp according to claim 2, wherein the second panel or the housing is provided with an outside air introduction hole for an air gap that is opened to communicate the outside with the air gap. Retaining tool.   A lighting fixture comprising: the electrodeless lamp holder according to any one of claims 1 to 4; and the electrodeless lamp held by the electrodeless lamp holder.

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