JP5135087B2 - Light emitting device - Google Patents

Description

  The present invention relates to a light emitting device including a flat lamp in which a discharge gas is sealed.

As a conventional light emitting device, a flat fluorescent lamp configured by sealing discharge gas in a sealed space with a pair of glass plates, a pair of electrodes provided at both ends of the front surface of the flat fluorescent lamp, and the electrodes There is known one having a pair of power supply members electrically connected to each other and a housing that houses a flat fluorescent lamp and presses the power supply member against an electrode (for example, see Patent Document 1). According to this light-emitting device, the flat fluorescent lamp is caused to emit light by applying a high-frequency voltage to the electrodes via the power supply member.
JP 2007-316388 A

  Here, in the light emitting device using the flat lamp as described above, since there is no electrode in the discharge space, there is a problem in startability. In order to improve startability, it is conceivable to provide a trigger electrode. In such a light emitting device, by applying a trigger voltage to the trigger electrode at the time of starting, the lamp can be lit with good startability even if the high frequency voltage applied to the lamp is low. However, in the light emitting device using the trigger electrode, when the thickness of the glass plate is reduced in order to increase the amount of light extracted from the flat lamp, the trigger electrode mounting portion cannot maintain sufficient mechanical strength. In addition, there was a possibility that a crack would occur from there. Therefore, there has been a demand for a light emitting device that can improve startability without using a trigger electrode and maintaining sufficient mechanical strength.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a light emitting device capable of improving startability while maintaining sufficient mechanical strength.

  In a light emitting device according to the present invention, a discharge gas that emits light when a voltage is applied is enclosed in an internal space of an airtight container formed in a flat plate shape by a dielectric, and the generated light is transmitted to the front side of the airtight container. A flat-type lamp provided with a front-side electrode formed so as to be capable of being emitted, and provided on the back side of the airtight container with a back-side electrode facing the front-side electrode via an internal space; A housing that accommodates the flat lamp, has an opening formed on the front electrode side for allowing light emitted from the flat lamp to pass, and has a support formed on the back electrode side that supports the flat lamp. The supporting portion includes a plurality of insulating rod-like members that extend from the bottom surface side of the housing toward the back electrode and support the flat lamp so as to be separated from the bottom surface.

  In this light emitting device, the flat lamp can be supported by a plurality of insulating rod-shaped members so as to be separated from the bottom surface of the housing. Thus, by separating the flat lamp from the bottom surface of the housing with the rod-shaped member, unnecessary electrostatic capacitance (floating capacitance) generated between the back electrode and the bottom surface becomes the electrostatic capacitance of the flat lamp itself. It is possible to suppress the addition, and to maintain an optimum matching condition between the power source and the flat lamp. In addition, by supporting the flat lamp in a point contact with the supporting insulator as a rod, it is possible to suppress the supporting insulator from acting as a dielectric between the back-side electrode and the bottom surface. it can. As a result, it is possible to suppress unnecessary capacitance from being added and maintain the optimum matching condition. As described above, it is possible to smoothly turn on the flat lamp by maintaining the optimum matching conditions, and it is possible to improve startability while maintaining sufficient mechanical strength without using the trigger electrode.

  In the light emitting device according to the present invention, it is preferable that a pressing member for pressing the airtight container against the rod-shaped member is provided in the opening of the housing. By pressing with a pressing member, an airtight container can be reliably fixed with a pressing member and a rod-shaped member.

  In the light emitting device according to the present invention, it is preferable that the rod-shaped member urges the airtight container against the pressing member. By energizing with the rod-shaped member, the airtight container can be more reliably fixed by the pressing member and the rod-shaped member.

  Moreover, in the light-emitting device according to the present invention, the back-side electrode is preferably composed of an electrode plate, and is preferably in direct contact with the back surface of the airtight container. For example, when a high frequency voltage is applied to the back surface of the hermetic container through an electrode layer formed by metal vapor deposition, problems such as peeling of the electrode layer occur, but the electrode plate is directly in contact with the back surface. A high frequency voltage can be directly applied to the discharge gas from the electrode plate without causing peeling.

  In the light emitting device according to the present invention, it is preferable that a heat radiating member is provided on the back side of the back side electrode. By radiating the back side electrode with the heat radiating member, the temperature of the flat lamp can be lowered to ensure the luminous efficiency.

  In the light emitting device according to the present invention, it is preferable that an insulating member is disposed between the back surface of the back electrode and the heat dissipation member. By disposing a flat insulating member between the back side electrode and the heat radiating member, it is possible to prevent a high frequency voltage from being applied to the heat radiating member.

  According to the light emitting device of the present invention, the startability can be improved while maintaining sufficient mechanical strength.

  Hereinafter, preferred embodiments of a light emitting device according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of a light emitting device according to an embodiment of the present invention. As shown in FIG. 1, the light emitting device 1 accommodates a disk-shaped flat lamp 2 in a housing 4 having a square top and bottom surface, and forms a circular opening at the center of the upper cover 8 of the housing 4. Thus, the light exit surface of the flat lamp 2 is exposed. The light-emitting device 1 is a device that can emit light by applying a high-frequency voltage to a discharge gas sealed inside the flat lamp 2 and take out the generated light from an opening. An annular frame member 9 is attached to the opening of the casing 4 so as to cover the outer edge of the flat lamp 2, and a fan 14 for cooling the inside of the casing 4 is provided on the side wall of the casing 4. Is provided.

  FIG. 2 is an exploded perspective view of the light emitting device shown in FIG. As shown in FIG. 2, the flat lamp 2 is formed over substantially the entire airtight container 22 formed of a dielectric material transparent to outgoing light such as quartz glass and the front surface 22 b of the airtight container 22. A mesh-shaped light passing electrode (front side electrode) 10 and a disk-shaped flat plate electrode (back side electrode) 3 facing the substantially entire surface of the back surface 22c of the airtight container 22 and contacting the back surface 22c. Configured. The flat electrode 3 and the light passing electrode 10 of the flat lamp 2 are opposed to each other through an internal space filled with a discharge gas. Accordingly, the light passing electrode 10 is set to the ground potential (ground potential), and a high frequency voltage is applied between the plate-like electrode 3 and the light passing electrode 10 to cause the discharge gas in the internal space to emit light, and the generated light is transmitted to the airtight container 22. Can be emitted from the front surface 22b side. The high frequency voltage is an alternating voltage having a frequency of 1 MHz or more.

  The airtight container 22 of the flat lamp 2 is formed by sealing a pair of disk-shaped glass substrates that are transparent to the emitted light, facing each other at a predetermined interval, and the peripheral edges are sealed with a peripheral wall. The interior space is filled with a discharge gas such as Xe gas. On the back surface 22c of the airtight container 22, the tip tube 22d used for exhausting the internal space and enclosing the discharge gas at the time of manufacture remains (see FIG. 5). In addition, a plurality of spacers 22a are provided in the internal space of the hermetic container 22 in order to withstand the atmospheric pressure during exhaust and the increase in discharge gas pressure due to the temperature increase during discharge (see FIG. 4).

  The light passing electrode 10 formed on the front surface 22b of the airtight container 22 is formed by metal vapor deposition, and is formed on almost the entire surface except for the outer edge portion of the front surface 22b. More specifically, the light passing electrode 10 has an annular portion 10a formed in an annular shape along the outer edge portion of the front surface 22b, and a mesh portion 10b formed in a net shape in an inner region of the annular portion 10a. Yes. Since the light passage electrode 10 is formed in a net shape over substantially the entire front surface 22b, the light generated in the internal space can be emitted from the front surface 22b. The light passing electrode 10 itself may be made of a light-transmitting material so that light can be emitted.

  The flat electrode 3 on the back surface 22 c side of the hermetic container 22 functions as an anode of the flat lamp 2, and is provided separately from the flat lamp 2. The flat electrode 3 is in direct contact with the back surface 22c, which is the glass surface of the hermetic container 22, and since it is a flat metal plate, the problem of electrode peeling hardly occurs. Further, the flat electrode 3 is constituted by an aluminum disc having an outer diameter substantially the same as the annular portion 10 a of the light passing electrode 10. That is, both the light passing electrode 10 and the flat electrode 3 are arranged except for the outer edge portions of the front surface 22b and the back surface 22c of the airtight container 22. Therefore, the creeping distance between both electrodes can be ensured, and the creeping discharge between both electrodes can be prevented. The flat electrode 3 is disposed in contact with the back surface 22c of the hermetic container 22 so that the center axis of the hermetic container 22 coincides. A wiring 15 connected to a high frequency power source is attached to the outer edge of the flat electrode 3, and a through hole 3 b for avoiding the tip tube 22 d is provided at a position corresponding to the tip tube 22 d of the airtight container 22. Is formed. The front surface 3a serving as a contact surface with the airtight container 22 is mirror-finished so as to reflect the light generated inside the airtight container 22 toward the front surface 22b. In addition, it replaces with the mirror surface process of the flat electrode 3, and the electric power feeding member for forming an electrode layer and reflecting mirror directly in the back surface 22c of the airtight container 22 by metal vapor deposition, such as aluminum, and feeding the flat electrode 3 to an electrode layer It may be used as

  In the flat lamp 2 configured in this manner, for example, when Xe gas is sealed with a discharge distance of about 5 mm between a pair of synthetic quartz glasses having an outer diameter of about 300 mm and a thickness of about 2 mm, The capacity is about 100 pF. As an example of the discharge conditions, the lighting frequency is 2050 kHz (about 2 MHz), the lamp discharge voltage is about 6 kVp-p, and the lamp voltage is about 3 kVp-p.

  The casing 4 that accommodates the flat lamp 2 is made of a conductive material, and the flat lamp 2 is arranged so that the bottom axis of the case 6 is made of a conductive aluminum and the bottom plate of the case 6 and the center axis coincide with each other. And a square plate-shaped upper lid 8 is covered from above. The upper lid 8 is formed with an opening 8 a having the same center axis as that of the flat lamp 2 and a larger diameter than that of the flat lamp 2. A frame-like member 9 for pressing the flat lamp 2 from above is fitted into the opening 8a. Further, a support base 7 for supporting and positioning the accommodated flat lamp 2 is provided on the bottom plate side inside the case 6 of the housing 4.

  An annular frame-shaped member (pressing member) 9 fitted into the opening 8a of the upper lid 8 is formed of a conductive material such as aluminum, and the diameter on the outer peripheral side thereof is the same as the inner diameter of the opening 8a. In addition, the diameter on the inner peripheral side is substantially the same as the inner diameter of the annular portion 10 a of the light passing electrode 10. On the lower surface side of the frame-shaped member 9, a step portion 9a having a diameter larger than that of the flat lamp 2 is provided so that the outer peripheral side is thicker than the inner peripheral side (see FIG. 4).

  The support base 7 provided inside the case 6 is provided with a substantially square base plate 5 disposed so as to cover the bottom surface of the case 6 and the four corners of the base plate 5. It comprises a support member 11 for positioning in the direction and an elastic support portion 12 provided at a plurality of locations on the base plate 5 at predetermined intervals and supporting the flat lamp 2 from below.

  The base plate 5 covering the bottom surface of the case 6 is disposed so as to face the bottom surface of the case 6 so that the central axes coincide with each other. When using a lamp that requires heat dissipation such as an excimer lamp, the base plate 5 is formed of a member having high thermal conductivity such as metal, so that heat dissipation around the flat lamp 2 can be secured. it can. On the other hand, when using a lamp such as a mercury lamp that requires heat insulation, the heat insulation around the flat lamp 2 can be ensured by forming the base plate 5 with a heat insulating member.

  FIG. 3 is an enlarged perspective view of the support member. As shown in FIG. 3, the support members 11 at the four corners of the base plate 5 are configured by a substantially rectangular parallelepiped insulating member made of ceramics or the like, and one side surface of the insulating member faces the central axis side of the base plate 5. Are arranged so that each. A stopper 11 b for positioning the flat lamp 2 is formed on a part of the upper surface of the support member 11 by erecting a wall portion surrounding the central axis of the base plate 5. The stopper 11b is formed in a gentle arc shape surrounding the central axis, and the arc diameter of the inner peripheral surface thereof is slightly larger than the outer diameter of the airtight container 22 of the flat lamp 2, The diameter of the arc of the surface is the same as the inner diameter of the step portion 9a on the lower surface side of the frame-shaped member 9 (see FIG. 4). Further, a plurality of grooves extending in the circumferential direction are formed on the inner circumferential surface of the stopper 11b in the vertical direction.

  Of the upper surface of the support member 11, a region on the inner peripheral side with respect to the stopper 11 b is a mounting portion 11 a for mounting the flat lamp 2, and a region on the outer peripheral side with respect to the stopper 11 b is screwed into the frame-shaped member 9. The seating surface 11c is used for mating. The mounting portion 11a on the inner peripheral side can be brought into contact with the flat lamp 2 only at two locations on both ends in the circumferential direction by forming a rectangular cutout portion 11e at the center position in the circumferential direction. . Further, a flat ground terminal 11d that is electrically connected to the frame-shaped member 9 is provided on the outer peripheral seating surface 11c. The ground terminal 11d has a screw hole 11f on the upper surface side and a bent portion that is bent downward in an L shape along the outer peripheral side surface of the support member 11. The bent portion is screwed on the side surface. It is fixed by being joined (see FIG. 4). Wiring is simultaneously fixed to the screwed portion, and the ground terminal 11d is electrically connected to the ground terminal of the high-frequency power source via the wiring.

  FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 1 and is an enlarged view of one end side of the flat lamp. As shown in FIG. 4, in the light emitting device 1, the base plate 5 of the support base 7 is disposed away from the bottom surface 6 a of the case 6 through a spacer 13. A flat electrode 3 of the flat lamp 2 is placed on the placement portion 11 a of the support member 11 provided at the corner of the base plate 5. Since the mounting portion 11a is configured to be able to contact the flat electrode 3 only at both ends in the circumferential direction (see FIG. 3), the area of the contact portion between the support member 11 and the flat lamp 2 is as small as possible. Has been. The mounted flat lamp 2 is arranged so that the peripheral surface 22e faces the inner peripheral surface of the stopper 11b of the support member 11, and the movement in the plane direction is restricted by the inner peripheral surface of the stopper 11b. Yes. Even when the peripheral surface 22e of the flat lamp 2 and the inner peripheral surface of the stopper 11b are in contact with each other by the plurality of grooves formed on the inner peripheral surface of the stopper 11b, the light passing electrode 10 of the flat lamp 2 is used. And creeping discharge between the flat electrode 3 can be suppressed.

  A frame-like member 9 fitted in the opening 8a of the upper lid 8 is placed on the outer peripheral seat surface 11c of the stopper 11b. The frame-like member 9 is formed with a thick outer peripheral side and a thin part on the inner peripheral side, and the lower surface of the thick outer peripheral part is in contact with the ground terminal 11d of the seat surface 11c. The thin portion on the inner peripheral side of the frame-shaped member 9 covers the upper surface of the stopper 11b and the outer edge portion of the flat lamp 2, and contacts the annular portion 10a of the light passing electrode 10 of the flat lamp 2 on the lower surface side. ing. Thereby, the frame-shaped member 9 functions as an energizing member for electrically connecting the ground terminal 11 d and the light passing electrode 10 of the flat lamp 2. Further, the frame-like member 9 is screwed into the support member 11 by passing the bolt 25 from above and screwed into the screw hole 11f, whereby the flat lamp 2 is lowered (on the flat electrode 3 side). Can be pressed. The frame-like member 9 is also screwed to the other three support members 11 not shown.

  The base plate 5 is provided with an elastic support portion 12 so as to be separated from the support member 11 at a predetermined interval in the plane direction. The elastic support portion 12 is configured by loading a bar-like member 16 extending upward into a guide hole of a boss portion 17 fixed to the base plate 5. The boss portion 17 has a guide hole penetrating in the vertical direction at the center thereof, and is fixed to the base plate 5 by screwing from the upper surface side so as to penetrate the base plate 5, and the lower end of the guide hole is A cap 17 a for sealing is provided on the lower surface side of the base plate 5.

  The rod-shaped member 16 extends substantially perpendicularly from the bottom surface 6a toward the upper flat electrode 3 and supports the flat lamp 2 so as to be separated from the bottom surface 6a. The flat electrode 3 is supported by 20 mm from the bottom surface 6a. They are separated by a certain amount. This rod-shaped member 16 is formed of an insulator such as ceramics having an outer diameter of about 6 mm, and its upper end portion is reduced in diameter and tapered. Therefore, since the area of the tip portion of the bar-shaped member 16 can be made extremely small with respect to the entire area of the back surface of the flat-plate electrode 3, the bar-shaped member 16 supports the flat-plate electrode 3 substantially in point contact. be able to. Further, since a compression spring 18 as an elastic member for applying an elastic force to the rod-shaped member 16 is disposed at the bottom of the guide hole of the boss portion 17, the rod-shaped member 16 is the back surface of the airtight container 22 of the flat lamp 2. The flat electrode 3 can be urged to 22c. A plurality of elastic support portions 12 are provided so that the flat lamp 2 can be supported in a balanced manner, but at least three elastic support portions 12 need to be provided, and about 10 are preferably provided.

  Here, the circuit configuration of the light-emitting device 1 of the present invention will be described. FIG. 5 is a schematic diagram showing a circuit configuration of the light emitting device according to the embodiment of the present invention.

  As shown in FIG. 5, the planar electrode 3 of the light emitting device 1 is electrically connected to the high-voltage terminal of the high-frequency power source 20 via the matching circuit 21, and the light passage electrode 10 is connected to the high-frequency power source 20 via the matching circuit 21. It is electrically connected to the ground terminal. The matching circuit 21 is configured by combining an inductor and a capacitor, and has a function of matching the impedance of the flat lamp 2 so as to match the output impedance and the load impedance on the high frequency power supply 20 side. By matching the matching conditions, the reflected power when power is supplied from the high-frequency power source 20 can be reduced, whereby a sufficient high-frequency voltage can be applied to the flat lamp 2 to light it.

  Next, functions and effects of the light emitting device 1 according to the present embodiment will be described.

  FIG. 6 is a schematic diagram showing a circuit configuration of a conventional light emitting device using a flat lamp 41 having a trigger electrode 45. In the light emitting device 40, since the flat electrode 43 and the wall surface 46 of the casing are close to each other, even if the matching condition of the matching circuit is matched to the flat lamp 41, the capacitance between the flat electrode 43 and the casing is large. (Stray capacitance) is added to the electrostatic capacitance of the flat lamp 41 itself, and the optimum matching condition is lost. Therefore, since the reflected power is increased, the high-frequency voltage cannot be applied in a sufficiently boosted state, and the flat lamp 41 may not be lit. In particular, since the electrostatic capacity of the flat lamp 41 itself is very small, the influence of the added electrostatic capacity becomes large. Therefore, in the light emitting device 40, in order to improve the startability, as shown in FIG. 6, a trigger electrode 45 in which a platinum foil is pinch-sealed with quartz glass is provided on the back surface 42b of the airtight container 42, and the trigger circuit 47 and the electric circuit are electrically connected. The ones that are connected to each other are used. Such a light emitting device 40 can be lit even when the high frequency voltage applied to the flat lamp 41 is low by applying a trigger voltage to the trigger electrode 45 at the time of starting. However, in the light emitting device 40 using the trigger electrode 45, when the thickness of the glass plate is reduced in order to increase the amount of light taken out of the flat lamp 41, the attachment portion of the trigger electrode 45 has sufficient mechanical strength. There was a possibility that a crack would occur without maintaining. In addition, the discharge enters the trigger electrode 45, and the discharge in the portion becomes unstable, which may cause a lack of stability.

  On the other hand, in the light emitting device 1 according to the present embodiment, as shown in FIG. 4, the flat lamp 2 can be supported by a plurality of insulating rod-like members 16 so as to be separated from the bottom surface 6 a of the housing 4. . Therefore, by separating the flat lamp 2 from the bottom surface 6a of the housing 4 with the rod-shaped member 16, the electrostatic capacitance (floating capacitance) between the flat electrode 3 and the bottom surface 6a can be reduced. Thereby, it is possible to suppress unnecessary capacitance from being added to the capacitance of the flat lamp 2 itself, and to maintain the optimum matching condition. In addition, since the dielectric constant of an insulator such as ceramics is larger than that of air and acts as a dielectric, if the support area of the support insulator is large, there is a possibility that capacitance will be added. By supporting the flat lamp 2 in a point contact substantially as a rod-shaped support member, it is possible to suppress unnecessary capacitance from being added and maintain the optimum matching conditions. Thus, the flat lamp 2 can be turned on smoothly, and startability can be improved while maintaining sufficient mechanical strength without using a trigger electrode.

  Further, the frame-like member 9 provided in the opening 8 a of the housing 4 can reliably fix the flat lamp 2 in the light emitting device 1 by pressing the airtight container 22 against the rod-like member 16. . Furthermore, by pressing the airtight container 22 of the flat lamp 2 downward, the back surface 22c of the airtight container 22 and the flat electrode 3 can be brought into contact with each other.

  Further, since the rod-shaped member 16 can urge the hermetic container 22 against the frame-shaped member 9, the flat lamp 2 can be reliably fixed in the light emitting device 1. Furthermore, since the flat electrode 3 can be urged to the back surface 22c of the hermetic container 22, the flat electrode 3 can be brought into close contact with the back surface 22c. Even if the lengths of the respective bar-shaped members 16 are slightly different due to manufacturing errors or the like, all the lengths of the bar-shaped members 16 are changed by the change in the compression amount of the compression springs 18 arranged at the bottom of each bar-shaped member 16. The rod-shaped member 16 can be brought into contact with the flat electrode 3 and urged. By the above, the flat electrode 3 can be reliably brought into contact with the back surface 22c of the airtight container 22. Further, the compression spring 18 of the rod-like member 16 can absorb an excessive pressing force to the flat lamp 2 and suppress the breakage of the airtight container 22.

  The present invention is not limited to the embodiment described above.

  For example, in the light emitting device 1 according to the present embodiment, the flat electrode 3 is directly supported by the rod-like member 16, but as shown in FIG. 7, a heat radiating member 32 is provided on the back surface 3 c side of the flat electrode 3. It may be. The heat dissipation member 32 is configured, for example, by arranging a plurality of fins in parallel on the lower surface of a circular aluminum plate provided to face the back surface 3c of the flat electrode 3. The flat lamp 2 can be cooled by sending air with the fan 14 with respect to the fin of the heat radiating member 32 comprised in this way. As a result, the temperature of the flat lamp 2 can be lowered to ensure luminous efficiency. In order to prevent capacitance from being added to the circuit of the flat lamp 2, the distance between the lower end of the fin of the heat radiating member 32 and the base plate 5 or the distance to the bottom surface 6a is about 15 to 20 mm. It is secured. According to this, it is possible to prevent the high-frequency voltage from being short-circuited with the housing 4 (ground potential).

  Further, as shown in FIG. 8, a disk-shaped insulating member 33 may be disposed between the back surface 3 c of the flat electrode 3 and the aluminum plate of the heat radiating member 32. As the insulating member 33, for example, an aluminum nitride plate having a high thermal conductivity and a high dielectric breakdown voltage can be used. When the flat electrode 3 and the heat radiating member 32 are in direct contact with each other, a high-frequency high-frequency voltage is also applied to the heat radiating member 32, so that the high-frequency voltage is applied to the heat radiating member 32 by disposing the insulating member 33. Can be prevented. At this time, the distance between the lower end of the fin of the heat radiating member 32 and the base plate 5 or the distance to the bottom surface 6a is also secured about 15 to 20 mm.

  Further, in the light emitting device 1 according to the present embodiment, the flat lamp 2 has a disk shape, but the shape is not limited thereto, and may be a rectangle or the like. The airtight container 22 of the flat lamp 2 is formed by a pair of disk-shaped glass substrates that are transparent to the emitted light and face each other at a predetermined interval, but only the glass substrate on the front surface 22b side is formed. It may be formed of a material that is transparent to the emitted light, and the other components may be formed of a material that is not transparent to the emitted light. In addition, when each electrode is formed of a metal film, an SiO2 film may be provided on each electrode with a thickness within a range that does not affect power feeding for protection.

  Further, in the light emitting device 1 according to the present embodiment, the flat electrode 3 is brought into direct contact with the back surface 22 c of the hermetic container 22, and the flat lamp 2 is supported by the rod member 16 through the flat electrode 3. Instead, as shown in FIG. 9, a metal film (not shown) is deposited as an electrode on substantially the entire back surface 22c of the hermetic container 22, and the flat lamp 2 is directly attached to the rod member 16 through the metal film. It is good also as a structure to support. In this case, power can be supplied to the metal film by attaching a metal plate 55 to which the wiring 15 is connected to the metal film on the back surface 22c of the hermetic container 22 by sticking or the like. Further, the pressing member is not limited to an annular frame member, and a plurality of pressing pieces 19 that locally press the edge of the flat lamp 2 may be used as shown in FIG.

1 is a perspective view of a light emitting device according to an embodiment of the present invention. It is a disassembled perspective view of the light-emitting device shown in FIG. FIG. 3 is an enlarged perspective view of a support member shown in FIG. 2. It is sectional drawing which follows the IV-IV line of FIG. It is the schematic which shows the circuit structure of the light-emitting device which concerns on embodiment of this invention. It is the schematic which shows the circuit structure of the conventional light-emitting device. It is sectional drawing of the light-emitting device which concerns on a modification. It is sectional drawing of the light-emitting device which concerns on a modification. It is a disassembled perspective view of the light-emitting device which concerns on a modification. It is a disassembled perspective view of the light-emitting device which concerns on a modification.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Light-emitting device, 2 ... Flat type lamp, 2b ... Front surface, 2c ... Back surface, 3 ... Flat plate electrode (back side electrode), 3c ... Back surface, 4 ... Housing, 6a ... Bottom surface, 8a ... Opening, 9 ... Frame Shaped member (pressing member), 10 ... light passing electrode (front side electrode), 16, 31, 34 ... rod-like member, 19 ... pressing piece (pressing member), 22 ... airtight container, 22b ... front face, 22c ... back face, 32 ... Heat dissipation member, 33 ... Insulating member.

Claims (6)

A discharge gas that emits light when a voltage is applied is enclosed in the internal space of the hermetic vessel formed in a flat plate shape by a dielectric, and the generated light can be emitted to the front side of the hermetic vessel. A planar lamp configured to be provided with a back side electrode facing the front side electrode via the internal space on the back side of the hermetic container,
An opening that accommodates the flat lamp and allows light emitted from the flat lamp to pass therethrough is formed on the front electrode side, and a support that supports the flat lamp is formed on the back electrode side. And
The supporting part extends toward the bottom side of the housing to the rear electrode, have a plurality of bar-like members of an insulating supporting so as to separate said planar lamp from said bottom surface,
The light emitting device , wherein the bar-like member supports the flat lamp substantially by point contact .   The light emitting device according to claim 1, wherein a pressing member that presses the airtight container against the rod-shaped member is provided in the opening of the casing.   The light emitting device according to claim 2, wherein the rod-shaped member biases the hermetic container against the pressing member.   The light emitting device according to any one of claims 1 to 3, wherein the back side electrode is constituted by an electrode plate and directly contacts the back side of the airtight container.   The light emitting device according to claim 1, wherein a heat radiating member is provided on a back side of the back side electrode.   The light emitting device according to claim 5, wherein an insulating member is disposed between the back surface of the back electrode and the heat radiating member.

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