JP2007188772A - Dielectric barrier discharge lamp and flat lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dielectric barrier discharge lamp excelling in a heat radiation property and capable of miniaturizing a lighting system; and to provide a flat lighting system using the dielectric barrier discharge lamp. <P>SOLUTION: A first discharge electrode 23 is arranged on the outside surface of a lid body 20 of a sealed vessel 21 with a discharge space 22 formed therein, and a second discharge electrode 24 is arranged on the outside surface of a bottom part of a vessel body 18. The second discharge electrode 24 side of the vessel body 18 is stuck on a chassis 11 made of a metal excelling in heat conductivity through a jointing material layer 17 formed out of a thermally-conductive material such as a thermally-conductive epoxy resin adhesive. The chassis 11 forms the back face side of a case 14 of the flat lighting system 10 for housing this dielectric barrier discharge lamp 15 and a driving circuit 16. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a dielectric barrier discharge lamp in which a pair of discharge electrodes are arranged to face each other with a discharge space and a dielectric interposed therebetween, and a flat illumination device using the dielectric barrier discharge lamp.

  Conventionally, as this type of flat illumination device, for example, there is one described in Patent Document 1. As shown in FIG. 17, the lighting device 50 applies, for example, a flat discharge tube 52 that performs dielectric barrier discharge in a flat globe 51 fixed to the ceiling C, and applies a high-frequency current to the flat discharge tube 52. And a drive circuit 53. The transparent electrode 54 on the front side of the flat discharge tube 52 is connected to the ground side of the drive circuit 53. Thereby, even if a person touches the transparent electrode 54 that is lit, current does not flow.

Further, a heat radiating plate 56 made of a conductive metal and in close contact with the circuit board of the drive circuit 53 is disposed on the inner surface of the back case 55 that is in close contact with the ceiling C of the globe 51. The heat radiating plate 56 is a flat discharge. It extends to a position corresponding to the back surface of the tube 52. The flat discharge tube 52 is electromagnetically shielded by the transparent electrode 54 and the heat radiating plate 56 both connected to the ground side of the drive circuit 53.
Japanese Patent Laying-Open No. 2005-302646 (page 4, FIG. 2)

  However, in the illuminating device 50 of Patent Document 1, the flat discharge tube 52 is held at a position separated from the heat radiating plate 56 joined to the inner surface of the back case 55. This is because the heat sink 56 is connected to the ground side of the drive circuit 53 while the back electrode 57 of the flat discharge tube 52 is at a high potential. Therefore, since there is a space between the flat discharge tube 52 and the heat radiating plate 56, the heat of the flat discharge tube 52 cannot be efficiently released to the heat radiating plate 56. For this reason, when the illuminance of the flat illumination device 50 is increased, the globe 51 is enlarged to increase the cooling capacity of the flat discharge tube 52 to increase the internal space volume, and the globe is convected by air convection in the same space. It was necessary to increase the amount of heat radiated from the entire 51. Therefore, if the illuminance of the flat illumination device 50 is to be increased, it is necessary to make the globe 51 larger, and there is a problem that the illumination device 50 becomes larger. Therefore, it is difficult to install the conventional flat illumination device 50 in a narrow space such as a refrigerator of a refrigerator car that is required to be thin.

  An object of the present invention is to provide a dielectric barrier discharge lamp that is excellent in heat dissipation and can reduce the size of an illumination device, and a planar illumination device using the dielectric barrier discharge lamp.

  In order to achieve the above object, according to the first aspect of the present invention, at least a part of a sealed container in which a discharge space filled with a discharge gas is formed is a light-transmitting portion made of a transparent dielectric, A dielectric having a transparent first discharge electrode provided on the outer surface or inner surface of the translucent portion, and a second discharge electrode facing the first discharge electrode across the discharge space provided on the outer surface or the inner surface of the sealed container In the barrier discharge lamp, a thermally conductive bonding is applied to the outer surface of the second discharge electrode provided on the outer surface of the sealed container or the outer surface of the sealed container corresponding to the second discharge electrode provided on the inner surface of the sealed container. The heat-dissipating member is brought into contact with the material layer or directly.

  According to a second aspect of the present invention, in addition to the first aspect of the invention, the first discharge electrode is provided on the inner surface of the light transmitting portion, and a transparent sealed container reinforcing member is closely attached to the outer surface of the light transmitting portion. It is provided in a state.

  According to a third aspect of the present invention, in addition to the first aspect of the invention, the first discharge electrode is provided on the outer surface of the light-transmitting portion, and the sealed container reinforcing member is transparent on the outer surface of the first discharge electrode. Are provided in close contact with each other, and the sealed container reinforcing member is electrically insulating.

  In addition to the invention of claim 2 or claim 3, the invention of claim 4 provides a drive circuit for applying a drive voltage between both discharge electrodes via a thermally conductive bonding material layer, or The heat radiation member is directly brought into contact with the heat radiating member.

  According to a fifth aspect of the invention, in addition to the fourth aspect of the invention, the heat radiating member is made conductive, and the second discharge electrode and the heat radiating member are connected to the ground side of the drive circuit. It is characterized by that.

  According to a sixth aspect of the present invention, in the fourth or fifth aspect of the present invention, a ground electrode is provided on the outer surface of the sealed container reinforcing member, and the ground electrode is connected to the ground side of the drive circuit. It is characterized by.

  The invention according to claim 7 is characterized in that, in the invention according to any one of claims 2 to 6, the sealed container reinforcing member is projected outward from the outer peripheral edge of the sealed container. To do.

  The invention according to claim 8 is the invention according to any one of claims 1 to 7, wherein the heat dissipating member projects outward from the outer peripheral edge of the sealed container. It is characterized by that.

The invention according to claim 9 is characterized in that, in the invention according to any one of claims 1 to 8, a plurality of the sealed containers are arranged in parallel on one of the heat radiating members. To do.
According to a tenth aspect of the present invention, there is provided a translucent part made of a transparent dielectric on the first surface side of both sides of a flat sealed container in which a discharge space filled with a discharge gas is formed. A dielectric having a transparent first discharge electrode provided on the outer surface or the inner surface thereof and a second discharge electrode facing the first discharge electrode across the discharge space provided on the outer surface or the inner surface on the second surface side of the both surfaces. In a flat illumination device comprising a barrier discharge lamp and a case containing the lamp, at least a part of the case is used as a heat radiating member, and the second surface of the dielectric barrier discharge lamp is used as a heat conductive bonding material. It is characterized by being brought into contact with the heat radiating member through a layer or directly.

  According to an eleventh aspect of the present invention, in the invention according to the tenth aspect, the first discharge electrode is provided on the inner surface of the light transmitting portion, and a transparent sealed container reinforcing member is in close contact with the outer surface of the light transmitting portion. It is provided.

  The invention according to claim 12 is the invention according to claim 10, wherein the first discharge electrode is provided on the outer surface of the translucent portion, and a transparent sealed container reinforcing member is closely attached to the outer surface of the first discharge electrode. The sealed container reinforcing member is provided with an electrical insulation property.

The invention according to claim 13 is the invention according to claim 11 or 12, wherein the sealed container reinforcing member is a part of the case.
According to a fourteenth aspect of the present invention, in the invention according to any one of the tenth to thirteenth aspects, the drive circuit for lighting the dielectric barrier discharge lamp is provided via a thermally conductive bonding material layer. Alternatively, the heat dissipation member is directly brought into contact with the heat radiating member.

  The invention according to claim 15 is the invention according to claim 14, wherein the heat dissipating member is made conductive and the second discharge electrode and the heat dissipating member are connected to the ground side of the drive circuit. Features.

(Function)
According to the first aspect of the present invention, when a high frequency current or a direct current pulse is applied between the first discharge electrode and the second discharge electrode, a discharge is generated in the discharge space in the sealed container. Then, the discharge gas generates ultraviolet rays by this discharge, and the ultraviolet rays are converted into visible light by the phosphor film provided in the sealed container and emitted from the translucent part to the outside of the sealed container. Alternatively, the discharge gas generates visible light by discharge in the discharge space, and this visible light is directly emitted from the translucent part to the outside of the sealed container. At this time, heat due to the discharge is generated in the discharge space. The heat generated in the discharge space is a heat radiating member in contact with the outer surface of the second discharge electrode provided on the outer surface of the sealed container or the outer surface of the sealed container corresponding to the second discharge electrode provided on the inner surface of the sealed container. Thus, heat is efficiently radiated from the sealed container. For this reason, unlike the conventional configuration in which heat generated in the heat dissipation space is radiated only through the air around the sealed container, a space for cooling the sealed container is secured around the sealed container. Since it is not necessary, the case for accommodating the dielectric barrier discharge lamp can be reduced in size.

  According to the second aspect of the present invention, in addition to the operation of the first aspect of the invention, the transparent sealed container reinforcing member is in close contact with the outer surface of the translucent part provided with the first discharge electrode on the inner surface. Therefore, the rigidity of the sealed container is improved and the translucent part is protected from the outside. For this reason, the sealed container comprised with brittle materials, such as glass, becomes difficult to be damaged by external force.

  According to the invention described in claim 3, in addition to the operation of the invention described in claim 1, a transparent sealed container reinforcing member is further provided on the outer surface of the first discharge electrode provided on the outer surface of the light transmitting portion. Thus, the first discharge electrode is covered and the rigidity of the sealed container is improved. For this reason, even if a high frequency current is applied between both electrodes with the second discharge electrode side as the ground side, current does not flow to the person who touched the dielectric barrier discharge lamp, and usability is improved. Moreover, the sealed container comprised with brittle materials, such as glass, becomes difficult to be damaged by external force.

  According to the invention described in claim 4, in addition to the operation of the invention described in claim 2 or claim 3, the heat generated in the drive circuit is efficiently radiated through the heat radiating member in contact with the drive circuit. . Accordingly, since it is not necessary to secure a large space around the periphery of the drive circuit for cooling, the case for housing the dielectric barrier discharge lamp and the drive circuit, and the flat illumination device using the dielectric barrier discharge lamp Miniaturization can be achieved.

  According to the invention described in claim 5, in addition to the operation of the invention described in claim 4, the conductive heat radiation member and the second discharge electrode are both connected to the ground side of the drive circuit. No stray capacitance is generated between the second discharge electrode and the heat dissipation member. Therefore, the leakage current from the second discharge electrode can be prevented and the load on the drive circuit can be prevented from increasing, so that the drive circuit can be reduced in size and the amount of generated heat can be suppressed. For this reason, the whole dielectric barrier discharge lamp provided with the drive circuit can be reduced in size and thickness.

  According to the invention described in claim 6, in addition to the action of the invention described in claim 4 or claim 5, the ground electrode connected to the ground side of the drive circuit and the second discharge electrode both provide a dielectric material. The barrier discharge lamp is electromagnetically shielded. For this reason, it is possible to suppress the emission of disturbance radio waves to the outside.

  According to invention of Claim 7, in addition to the effect | action of the invention as described in any one of Claims 2-6, since the sealed container reinforcement member has protruded outside from the outer periphery of the sealed container, Even if an object hits the overhanging portion from the outside, no impact is directly applied to the sealed container. For this reason, the sealed container formed of a fragile material such as glass can be protected against an impact from the outside.

  According to invention of Claim 8, in addition to the effect | action of the invention as described in any one of Claims 1-7, since the member for thermal radiation has protruded outside from the outer periphery of the sealed container, Even if an object hits the projecting portion from the outside, the sealed container is not directly impacted. For this reason, the sealed container formed of a fragile material such as glass can be protected against an impact from the outside.

  According to invention of Claim 9, in addition to the effect | action of the invention as described in any one of Claims 1-8, the several sealed container arranged in parallel on one heat radiating member Thus, it is possible to configure a dielectric barrier discharge lamp having a light emitting area larger than the area of the light transmitting part in each sealed container. For this reason, many types of dielectric barrier discharge lamps having different light emitting areas can be manufactured with fewer types of dielectric barrier discharge lamps.

  According to the invention described in claim 10, when a high-frequency current or a direct current pulse is applied between the first discharge electrode and the second discharge electrode, a discharge is generated in the discharge space in the sealed container. Then, the discharge gas generates ultraviolet rays by this discharge, and the ultraviolet rays are converted into visible light by the phosphor film provided in the sealed container and emitted from the translucent part to the outside of the sealed container. Alternatively, the discharge gas generates visible light by discharge in the discharge space, and this visible light is directly emitted from the translucent part to the outside of the sealed container. At this time, heat due to the discharge is generated in the discharge space. Heat generated in the dielectric barrier discharge lamp is efficiently radiated to the outside of the case through a heat radiating member constituting at least a part of the case housing the dielectric barrier discharge lamp. Therefore, unlike the conventional configuration, the heat generated in the dielectric barrier discharge lamp is radiated to the case side via the air around the dielectric barrier discharge lamp. Since it is not necessary to secure a large space for cooling the dielectric barrier discharge lamp around the casing, the case can be reduced in size and thickness.

  According to the eleventh aspect of the invention, in addition to the action of the tenth aspect, the transparent sealed container reinforcing member is in close contact with the outer surface of the translucent part having the first discharge electrode provided on the inner surface. Therefore, the rigidity of the sealed container is improved and the translucent part is protected from the outside. For this reason, the sealed container comprised with brittle materials, such as glass, becomes difficult to be damaged by external force.

  According to the twelfth aspect of the invention, in addition to the action of the tenth aspect of the invention, a transparent sealed container reinforcing member is further provided on the outer surface of the first discharge electrode provided on the outer surface of the light transmitting portion. Thus, the first discharge electrode is covered and the rigidity of the sealed container is improved. For this reason, even if a high frequency current is applied between both electrodes with the second discharge electrode side as the ground side, current does not flow to the person who touched the flat illumination device, and usability is improved. Moreover, the sealed container comprised with brittle materials, such as glass, becomes difficult to be damaged by external force.

  According to the invention of the thirteenth aspect, in addition to the action of the invention of the eleventh or the twelfth aspect, since the sealed container reinforcing member becomes a part of the case, without increasing the number of parts and the number of assembly steps. The sealed container can be protected.

  According to the invention described in claim 14, in addition to the operation of the invention described in any one of claims 10-13, the heat generated in the drive circuit passes through the heat radiating member that contacts the drive circuit. Heat is dissipated efficiently. Therefore, it is not necessary to secure a large space for cooling the drive circuit around the drive circuit in the case, so that the case and the planar illumination device can be further downsized.

  According to the invention described in claim 15, in addition to the action of the invention described in claim 14, since both the conductive heat radiation member and the second discharge electrode are connected to the ground side of the drive circuit, No stray capacitance is generated between the second discharge electrode and the heat dissipation member. For this reason, it is possible to prevent leakage current from the second discharge electrode and to prevent an increase in the load on the drive circuit. Therefore, it is possible to reduce the size of the drive circuit and suppress the amount of heat generated. As a result, the entire dielectric barrier discharge lamp provided with the drive circuit can be reduced in size and thickness.

  According to the present invention, it is possible to provide a dielectric barrier discharge lamp that is excellent in heat dissipation and can reduce the size of the lighting device, and a flat lighting device using the dielectric barrier discharge lamp.

(First embodiment)
Next, a first embodiment in which the present invention is embodied in, for example, a flat lighting device installed in a refrigerator of a refrigerator car will be described with reference to FIGS.

  As shown in FIGS. 3 (a) and 3 (b), the flat illumination device 10 is made of a metal such as aluminum or copper having conductivity and excellent thermal conductivity, and is fixed to a ceiling C of a refrigerator or the like. A chassis 11 is provided. A square box-shaped cover 12 made of metal such as stainless steel is detachably fixed to the chassis 11. A flat window member 13 made of a transparent synthetic resin such as polycarbonate and forming a window of the flat illumination device 10 is attached to the opening provided in the cover 12. The chassis 11, the cover 12, and the window member 13 constitute a flat case 14, and a flat dielectric barrier discharge lamp 15 and a drive circuit 16 are accommodated in the case 14.

  As shown in FIGS. 2A and 2B, the dielectric barrier discharge lamp 15 is bonded to the chassis 11 via a thermally conductive bonding material layer 17. Examples of the bonding material include a heat conductive epoxy adhesive such as a trade name Scotch Weld EW2070 manufactured by 3M Company, a heat conductive double-sided tape, and the like.

  As shown in FIGS. 1 and 2 (b), the dielectric barrier discharge lamp 15 includes a flat bottomed box-shaped container body 18 made of a dielectric material such as transparent glass and having one open side. A phosphor film 19 a is formed on the inner surface of the bottom portion as the second surface side of the main body 18. As in the case of the container body 18, the opening of the container body 18 is made of a transparent material such as transparent glass and has a phosphor film 19b formed on the inner surface, and a flat lid as the first surface side. The body 20 is joined. A flat sealed container 21 is formed by the container body 18 and a lid 20 that closes the opening of the container body 18, and is sandwiched between the pair of phosphor films 19 a and 19 b inside the sealed container 21. A discharge space 22 (shown in FIG. 2B) is formed. The discharge space 22 is filled with a discharge gas that generates ultraviolet rays by discharge. Examples of the discharge gas include rare gases such as Xe (xenon) gas, Ar (argon) gas, and Ne (neon) gas.

  Moreover, as shown in FIG.1 and FIG.2 (b), the transparent 1st discharge electrode 23 is formed in the outer surface of the cover body 20. As shown in FIG. The first discharge electrode 23 is formed by sputtering, vapor deposition, CVD (Chemical Vapor Deposition), or coating using, for example, indium tin oxide (ITO), tin oxide, or zinc. A second discharge electrode 24 similar to the first discharge electrode 23 is formed on the outer surface of the bottom of the container body 18. However, the second discharge electrode 24 does not need to be transparent like the first discharge electrode 23. The second discharge electrode 24 may be an opaque metal thin film. The first discharge electrode 23 and the second discharge electrode 24 are opposed to each other with the lid 20, the phosphor film 19b, the discharge space 22, the phosphor film 19a, and the container body 18 (bottom part) interposed therebetween. The dielectric barrier discharge lamp 15 is bonded to the chassis 11 via the bonding material layer 17 on the second discharge electrode 24 side. Furthermore, the second discharge electrode 24 is electrically connected to the chassis 11 via a wire (not shown).

  Also, as shown in FIG. 2B, the drive circuit 16 has a configuration in which circuit components are mounted on one side on a heat conductive circuit board 25, and the circuit board 25 includes the bonding material layer. 17 is bonded onto the chassis 11 via The high potential side of the drive circuit 16 is connected to the first discharge electrode 23 through a wire (not shown), and the ground side is connected to the chassis 11.

  As shown in FIG. 3B, the flat illumination device 10 configured as described above is installed by screwing the chassis 11 in close contact with a ceiling C made of aluminum of a refrigerator of a refrigerator car, for example. Is done.

  In the flat illumination device 10, when a high frequency current is applied from the drive circuit 16 between the first discharge electrode 23 and the second discharge electrode 24 of the dielectric barrier discharge lamp 15, a discharge is generated in the discharge space 22. Then, ultraviolet rays are generated from the discharge gas by this discharge, and visible light is generated from both phosphor films 19a and 19b by the ultraviolet rays. This visible light is radiated to the outside from the dielectric barrier discharge lamp 15 through the transparent lid 20 and the first discharge electrode 23, and is radiated to the outside of the case 14 through the transparent window member 13.

  At this time, heat is generated in the discharge space 22 of the dielectric barrier discharge lamp 15, and the temperature of the sealed container 21 rises due to this heat. The heat of the sealed container 21 is released to the chassis 11 having excellent heat conductivity through the heat conductive bonding material layer 17, and is further released from the chassis 11 to the ceiling C made of aluminum. For this reason, the dielectric barrier discharge lamp 15 is efficiently cooled. Therefore, unlike the conventional configuration in which heat generated in the discharge space 22 is simply radiated to the case 14 by convection of air around the sealed container 21, a large space for cooling the sealed container 21 is provided in the sealed container 21. Since it is not necessary to secure the surroundings, the case 14 for housing the dielectric barrier discharge lamp 15 can be reduced in size and thickness. Therefore, it is possible to provide the flat lighting device 10 that is excellent in heat dissipation and thinned.

Hereinafter, effects other than those described above which this embodiment has are listed.
(1) A drive circuit 16 for applying a high-frequency current between the first discharge electrode 23 and the second discharge electrode 24 of the dielectric barrier discharge lamp 15 is brought into contact with the chassis 11 via a heat conductive bonding material layer 17. It was. For this reason, the heat generated in the drive circuit 16 is efficiently radiated through the chassis 11 in contact with the drive circuit 16. Accordingly, since it is not necessary to secure a large space for cooling the drive circuit 16, the case 14 and the flat illumination device 10 can be further reduced in size and thickness.

  (2) Since the second discharge electrode 24 and the conductive chassis 11 are connected to the ground side of the drive circuit 16, stray capacitance does not occur between the second discharge electrode 24 and the chassis 11. Therefore, the leakage current from the second discharge electrode 24 can be prevented to prevent an increase in the load on the drive circuit 16, so that the drive circuit 16 can be downsized and the amount of heat generated can be suppressed. For this reason, the planar illumination device 10 including the drive circuit 16 can be further reduced in size and thickness.

(Second Embodiment)
Next, a second embodiment in which the present invention is embodied in a flat illumination device similar to the first embodiment will be described with reference to FIGS. In addition, about the same structure as 1st Embodiment, the code | symbol is made the same and the description is abbreviate | omitted, and only the sealed container reinforcement member 30, the ground electrode 31, and case 14 different from 1st Embodiment are demonstrated.

  As shown in FIGS. 4 and 5 (a), 5 (b), the dielectric barrier discharge lamp 15 in the first embodiment has a transparent and insulating material such as polycarbonate or glass on the first discharge electrode 23 side. The sealed container reinforcing member 30 is bonded via a bonding material layer 17 having thermal conductivity. This bonding material is the same as that of the first embodiment and is transparent. A ground electrode 31 similar to the first discharge electrode 23 and the second discharge electrode 24 is formed on the outer surface of the sealed container reinforcing member 30. The ground electrode 31 is connected to the ground side of the drive circuit 16.

  Moreover, as shown to Fig.6 (a), (b), in the cover 12 of case 14 of this embodiment, what is corresponded to the window member 13 in 1st Embodiment is not provided, Instead, The sealed container reinforcing member 30 is a window by being brought into contact with the peripheral edge of the opening of the cover 12 through the ground electrode 31. That is, the sealed container reinforcing member 30 constitutes a part of the case 14. The ground electrode 31 is connected to the chassis 11 via the conductive cover 12.

  According to the above embodiment, the sealed container reinforcing member 30 that is transparent and has electrical insulation is provided in close contact with the outer surface of the lid 20 in the sealed container 21, so that the rigidity of the sealed container 21 is improved and the lid body is provided. 20 is protected from the outside. For this reason, the fragile and thin sealed container 21 made of glass is not easily damaged by an external force.

Hereinafter, effects other than those described above which this embodiment has are listed.
(1) Since the first discharge electrode 23 provided on the outer surface of the lid body 20 is covered with the sealed container reinforcing member 30, a person does not touch the first discharge electrode 23. For this reason, an electric current does not flow to the person who touched the flat illuminating device 10, and usability improves.

  (2) Since the ground electrode 31 connected to the ground side of the drive circuit 16 is provided on the outer surface of the hermetic container reinforcing member 30, the dielectric barrier discharge lamp 15 is formed by the ground electrode 31 and the second discharge electrode 24. Electromagnetic shielding. For this reason, it is possible to suppress the emission of disturbance radio waves to the outside.

(Example of change)
In addition, this embodiment can also be changed and embodied as follows.
In the planar illumination device 10 shown in FIGS. 6A and 6B, the dielectric barrier discharge lamp 15 is fastened and fixed between the chassis 11 and the cover 12 without providing the bonding material layer 17. Thus, the second discharge electrode 24 side of the dielectric barrier discharge lamp 15 is brought into direct pressure contact with the inner surface of the chassis 11 and the sealed container reinforcing member 30 is brought into direct pressure contact with the first discharge electrode 23 side.

  Further, in the planar illumination device 10 shown in FIGS. 3A and 3B, a dielectric is provided between the chassis 11 and the window member 13 without providing a space between the first discharge electrode 23 and the window member 13. The body barrier discharge lamp 15 is fastened and fixed. Thereby, the second discharge electrode 24 side of the dielectric barrier discharge lamp 15 is brought into direct pressure contact with the inner surface of the chassis 11 and the window member 13 is brought into direct pressure contact with the first discharge electrode 23 side.

7A, in the first embodiment, the first discharge electrode 23 is provided on the inner surface of the lid 20 of the sealed container 21, and the first discharge electrode 23 is formed of MgO, SiO. ₂ , covered with a protective film 35 made of a dielectric thin film such as ZnS, MgF ₂ , and the phosphor film 19b is provided on the protective film 35. In this case, since the person does not directly touch the first discharge electrode 23, there is no electric shock. Further, if the lid body 20 of the sealed container 21 is thickened to reduce the stray capacitance between the first discharge electrode 23, the leakage current between humans is suppressed. For this reason, the window member 13 in the case 14 can be omitted. It is also possible to adopt a configuration in which the protective film 35 is not provided on the first discharge electrode 23. Further, as shown by a two-dot chain line in FIG. 7A, if the sealed container reinforcing member 30 is provided on the outer surface of the lid body 20 provided with the first discharge electrode 23 on the inner surface, the sealed container 21 is provided. Is less likely to be damaged by external force. Further, as shown in FIG. 7B, in the first embodiment, the second discharge electrode 24 is provided on the inner surface of the bottom of the container body 18 of the sealed container 21, and the second discharge electrode 24 is disposed on the inner surface of the container body 18. The protective film 35 is covered, and the phosphor film 19a is provided on the protective film 35. In this case, by connecting the first discharge electrode 23 to the ground side of the drive circuit 16 and connecting the first discharge electrode 23 to the high potential side, an electric shock when a person touches the first discharge electrode 23 is obtained. It is preferable to adopt a configuration to prevent. Further, if the thickness of the bottom of the container body 18 is increased to reduce the stray capacitance with the second discharge electrode 24, the leakage current with the chassis 11 is suppressed. Note that the protective film 35 may not be provided on the second discharge electrode 24. Further, in this embodiment, as in the first embodiment, the second discharge electrode 24 may be connected to the ground side of the drive circuit 16 and the first discharge electrode 23 may be set to the high potential side. Further, as shown in FIG. 7B, if a configuration in which a sealed container reinforcing member 30 is further provided on the outer surface of the first discharge electrode 23 provided on the outer surface of the lid 20, a person is placed on the first discharge electrode 23. The sealed container 21 is not easily damaged by external force.

  Further, as shown in FIG. 8, the first discharge electrode 23 is provided on the inner surface of the lid body 20 of the sealed container 21, and the second discharge electrode 24 is provided on the inner surface of the bottom portion of the container body 18. The phosphor film 19 b is provided on the surface of the protective film 35 covered with the first discharge electrode 23, and the phosphor film 19 a is provided on the protective film 35 covered with the second discharge electrode 24. In this case, since the person does not directly touch the first discharge electrode 23, the window member 13 in the case 14 can be omitted. In addition, it can also be set as the structure which does not provide any one protective film 35 of the 1st discharge electrode 23 and the 2nd discharge electrode 24. FIG. Further, as shown by a two-dot chain line in FIG. 8, if the sealed container reinforcing member 30 is provided on the outer surface of the lid body 20 provided with the first discharge electrode 23 on the inner surface, the sealed container 21 is damaged by an external force. It becomes difficult to do.

  9A and 9B, for example, three dielectric barrier discharge lamps 15 are arranged in a row on one chassis 11, and the outer surface of each dielectric barrier discharge lamp 15 Alternatively, a single sealed container reinforcing member 30 may be bonded to the other. In this case, the flat illumination device 10 having a light emitting area larger than that of each dielectric barrier discharge lamp 15 can be configured. For this reason, many types of flat illumination devices 10 having different light emission areas can be easily manufactured.

  Alternatively, the chassis 11 may be configured to project outward from the outer peripheral edges of the three dielectric barrier discharge lamps 15. In this case, for example, when the flat illumination device 10 is hit against an object in an installation operation or the like, there is a high possibility that the chassis 11 protruding outward from the outer peripheral edge of the dielectric barrier discharge lamp 15 will hit the object. Therefore, since the impact is not directly applied to the sealed container, the dielectric barrier discharge lamp 15 formed of a fragile material such as glass can be effectively protected. Further, as shown by a two-dot chain line in FIG. 9B, the sealed container reinforcing member 30 may be configured to project outward from the outer peripheral edges of the three dielectric barrier discharge lamps 15.

  As shown in FIGS. 10A and 10B, for example, four dielectric barrier discharge lamps 15 are arranged side by side on a single chassis 11 so as to be arranged vertically and horizontally, and each dielectric barrier discharge lamp. A configuration may be adopted in which one sealed container reinforcing member 30 is bonded to the outer surface of 15.

  Further, the sealed container reinforcing member 30 may be configured to project outward from the outer peripheral edge of the four dielectric barrier discharge lamps 15. Also in this case, the dielectric barrier discharge lamp 15 formed of a fragile material such as glass can be effectively protected against an impact from the outside. Further, as shown by a two-dot chain line in FIG. 10B, the chassis 11 may be configured to project outward from the outer peripheral edges of the four dielectric barrier discharge lamps 15.

  11A, 11B, and 11C, a heat radiating member 40 is bonded to the second discharge electrode 24 side of one rectangular dielectric barrier discharge lamp 15, and the first discharge is performed. The sealed container reinforcing member 30 is bonded to the electrode 23 side. Further, the heat dissipation member 40 may be configured to project outward from one of the short sides of the dielectric barrier discharge lamp 15. In this case, as shown by the two-dot chain line in FIG. 11 (c), the sealed container reinforcing member 30 may be projected in the same manner as the heat radiating member 40.

  Further, as shown in FIGS. 12A, 12B, and 12C, the heat dissipating member 40 may be configured to project outward from one of the long sides of the rectangular dielectric barrier discharge lamp 15. Good. In this case, as shown by a two-dot chain line in FIG. 12B, the sealed container reinforcing member 30 may be projected in the same manner as the heat radiating member 40.

  Further, as shown in FIGS. 13A, 13B, and 13C, the heat dissipating member 40 is placed outward from both short sides of the rectangular dielectric barrier discharge lamp 15 and one of the long sides. An overhanging configuration may be used. In this case, as shown by the two-dot chain line in FIGS. 13B and 13C, the sealed container reinforcing member 30 may be projected in the same manner as the heat radiating member 40.

  As shown in FIG. 14, a heat radiation member 42 in which a large number of heat radiation pins 41 are integrally formed on the outer surface may be joined to the outer surface of the second discharge electrode 24 of the dielectric barrier discharge lamp 15.

  Moreover, as shown in FIG. 15, it is good also as a structure which joined to the outer surface of the 2nd discharge electrode 24 of a dielectric barrier discharge lamp the heat radiating member 44 by which many heat radiating fins 43 were integrally formed on the outer surface.

  As shown in FIGS. 16A and 16B, the first heat radiating member 50 is bonded to the outer surface of the second discharge electrode 24 in the dielectric barrier discharge lamp 15 via the bonding material layer 17, The second heat radiating member 51 is bonded to the outer surface of the circuit board 25 in the drive circuit 16 via the bonding material layer 17. Further, the first heat radiating member 50 and the second heat radiating member 51 are arranged on both sides of the third heat radiating member 52 made of metal such as aluminum having excellent heat conductivity, and excellent in heat conductivity. It fixes via the supporting member 53 which consists of metals, such as iron. In this case, the heat generated in the dielectric barrier discharge lamp 15 is radiated from the first heat radiating member 50 to the third heat radiating member 52 via the support member 53, and the heat generated in the drive circuit 16 is The heat is radiated from the second heat radiating member 51 to the third heat radiating member 52 through the support member 53. In this way, the configuration in which the dielectric barrier discharge lamp 15 and the drive circuit 16 are integrated in a state where they are superposed on each other takes a large lateral dimension with respect to the light emitting area of the dielectric barrier discharge lamp 15. For example, the third heat radiating member 52 can be used in a state where it is screwed inside the housing of the garden lamp. The heat released by the third heat radiating member 52 is further radiated to the housing. Even in this configuration, the heat generated in the dielectric barrier discharge lamp 15 is efficiently radiated by the first heat radiating member 50, so there is no need to secure a large space around the dielectric barrier discharge lamp 15. . In addition, since heat generated in the drive circuit 16 is efficiently radiated by the second heat radiation member 51, it is not necessary to secure a large space around the drive circuit 16. Therefore, the garden lamp can be reduced in size.

The disassembled perspective view which showed the dielectric barrier discharge lamp of 1st Embodiment. (A) is the top view which showed the dielectric barrier discharge lamp and drive circuit with which the chassis was mounted | worn, (b) is the sectional view on the aa line in (a). (A) is the top view which showed the flat type illuminating device, (b) is the bb sectional view taken on the line in (a). The disassembled perspective view which showed the dielectric barrier discharge lamp of 2nd Embodiment. (A) is the top view which showed the dielectric barrier discharge lamp and drive circuit with which the chassis was mounted | worn, (b) is the cc sectional view taken on the line in (a). (A) is the top view which showed the flat type illuminating device, (b) is the dd sectional view taken on the line in (a). (A), (b) is the longitudinal cross-sectional view which showed the dielectric barrier discharge lamp in other embodiment. The longitudinal cross-sectional view which showed the dielectric barrier discharge lamp in other embodiment. (A) is the top view which showed the dielectric barrier discharge lamp in other embodiment, (b) is a side view similarly. (A) is the top view which showed the dielectric barrier discharge lamp in other embodiment, (b) is a side view similarly. (A) is the top view which showed the dielectric barrier discharge lamp in other embodiment, (b) is a side view similarly, (c) is a bottom view similarly. (A) is the top view which showed the dielectric barrier discharge lamp in other embodiment, (b) is a side view similarly, (c) is a bottom view similarly. (A) is the top view which showed the dielectric barrier discharge lamp in other embodiment, (b) is a side view similarly, (c) is a bottom view similarly. The perspective view which showed the dielectric barrier discharge lamp in other embodiment. The perspective view which showed the dielectric barrier discharge lamp in other embodiment. (A) is the side view which showed the dielectric barrier discharge lamp and drive circuit in other embodiment, (b) is a top view similarly. The longitudinal cross-sectional view which showed the conventional flat discharge tube illuminating device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Plane type illuminating device, 11 ... Chassis as heat radiating member, 14 ... Case, 15 ... Dielectric barrier discharge lamp, 16 ... Drive circuit, 17 ... Bonding material layer, 18 ... Container main body which comprises sealed container, 20 ... similar lid, 21 ... sealed container, 22 ... discharge space, 23 ... first discharge electrode, 24 ... second discharge electrode, 25 ... heat radiating member, 30 ... sealed container reinforcing member, 31 ... ground electrode, 40,42 44 ... Heat dissipation member.

Claims (15)

At least a part of a sealed container in which a discharge space filled with a discharge gas is formed is a transparent portion made of a transparent dielectric,
A transparent first discharge electrode is provided on the outer surface or inner surface of the light transmitting portion,
In a dielectric barrier discharge lamp in which a second discharge electrode facing the first discharge electrode across the discharge space is provided on the outer surface or the inner surface of the sealed container,
With respect to the outer surface of the second discharge electrode provided on the outer surface of the sealed container or the outer surface of the sealed container corresponding to the second discharge electrode provided on the inner surface of the sealed container, a thermally conductive bonding material layer is interposed. Alternatively, a dielectric barrier discharge lamp characterized in that a heat radiating member is directly brought into contact.   2. The dielectric barrier discharge lamp according to claim 1, wherein the first discharge electrode is provided on an inner surface of the translucent part, and a transparent sealed container reinforcing member is provided in close contact with the outer surface of the translucent part. .   The first discharge electrode is provided on the outer surface of the translucent part, and a transparent sealed container reinforcing member is provided in close contact with the outer surface of the first discharge electrode, and the sealed container reinforcing member is electrically insulating. The dielectric barrier discharge lamp according to claim 1.   3. A drive circuit for applying a drive voltage between the two discharge electrodes is brought into contact with the heat radiating member via a heat conductive bonding material layer or directly. 4. The dielectric barrier discharge lamp according to 3.   5. The dielectric barrier discharge lamp according to claim 4, wherein the heat dissipating member is conductive and the second discharge electrode and the heat dissipating member are connected to the ground side of the drive circuit.   6. The dielectric barrier discharge lamp according to claim 4, wherein a ground electrode is provided on an outer surface of the sealed container reinforcing member, and the ground electrode is connected to a ground side of the drive circuit.   The dielectric barrier discharge lamp according to any one of claims 2 to 6, wherein the sealed container reinforcing member protrudes outward from an outer peripheral edge of the sealed container.   The dielectric barrier discharge lamp according to any one of claims 1 to 7, wherein the heat radiating member projects outward from an outer peripheral edge of the sealed container.   The dielectric barrier discharge lamp according to any one of claims 1 to 8, wherein a plurality of the sealed containers are arranged side by side on a single member for heat dissipation. The first surface side of both surfaces of a flat sealed container in which a discharge gas filled with a discharge gas is formed is a translucent portion made of a transparent dielectric, and a transparent second surface is formed on the outer surface or inner surface of the translucent portion. A dielectric barrier discharge lamp provided with one discharge electrode, and a second discharge electrode facing the first discharge electrode across the discharge space on the outer surface or the inner surface of the second surface on both surfaces; In a flat illumination device comprising a case,
At least a part of the case is used as a heat radiating member, and the second surface of the dielectric barrier discharge lamp is brought into contact with the heat radiating member via a heat conductive bonding material layer or directly. A flat illumination device characterized by the above.   The flat illumination device according to claim 10, wherein the first discharge electrode is provided on an inner surface of the translucent part, and a transparent sealed container reinforcing member is provided in close contact with the outer surface of the translucent part.   The first discharge electrode is provided on the outer surface of the translucent part, and a transparent sealed container reinforcing member is provided in close contact with the outer surface of the first discharge electrode, and the sealed container reinforcing member is electrically insulating. The flat illumination device according to claim 10.   The flat illumination device according to claim 11, wherein the sealed container reinforcing member is a part of the case.   The driving circuit for lighting the dielectric barrier discharge lamp is brought into contact with the heat radiating member through a heat conductive bonding material layer or directly. The flat illumination device according to any one of the above.   15. The flat illumination device according to claim 14, wherein the heat dissipating member is conductive and the second discharge electrode and the heat dissipating member are connected to the ground side of the drive circuit.

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