JP2006173016A - Flat discharge tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flat discharge tube lowering a driving voltage without causing uneven light emission in a discharge space. <P>SOLUTION: Transparent discharge electrodes 18, 19 facing a discharge space 16 provided between a lid body 13 and a bottom part 14 disposed face to face are provided on the lid body and the bottom part respectively, and current carrying electrodes 20, 21 extending like a belt are provided on the transparent discharge electrodes 18, 19 respectively. The current carrying electrode 20 is extendedly provided along the long side 18a on the upper side of the square transparent discharge electrode 18, and the current carrying electrode 21 is extendedly provided along the long side 19a on the lower side of the transparent discharge electrode 19. The lengths of the respective current carrying electrodes 20, 21 are made 50% or longer than the lengths of the long sides 18a, 19a of both transparent discharge electrodess 18, 19, and are made not less than 20% of that of the all-round rim of the transparent discharge electrode 18, 19. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a flat discharge tube in which a discharge space in which a discharge gas is sealed is provided between a pair of opposed dielectric plates.

Conventionally, this type of flat discharge tube is disclosed in Patent Document 1. In this flat discharge tube, a discharge space is formed between a pair of glass substrates arranged to face each other. A transparent discharge electrode is formed on the outer surface of one of the glass substrates, and a phosphor film is formed on the inner surface thereof. Moreover, a transparent discharge electrode is formed on the inner surface of the other of the glass substrates, and a phosphor film is formed on the transparent discharge electrode. Each transparent discharge electrode is provided with a rectangular small piece-like conductor (energization electrode) on the periphery thereof, and a power supply wire is soldered to the conductor.
JP 2003-31182 A

  By the way, a high driving voltage is required to uniformly emit light in the entire discharge space of the flat discharge tube as described in Patent Document 1, and a power supply device that supplies the driving voltage needs to be large. is there. That is, if the drive voltage is not sufficiently high, light is emitted in a region close to the conductor in the discharge space, but the light emission becomes weaker as the distance from the conductor is increased, and uneven light emission occurs in the entire discharge space. This is because, since the conductor is a small piece, an electrode portion is formed on the transparent discharge electrode where the distance from the conductor is excessive, and the resistance of the transparent discharge electrode between the electrode portion and the conductor is excessive. This is considered to be because the drive voltage applied to the discharge space facing this electrode portion becomes small.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a flat discharge tube capable of lowering the driving voltage without causing uneven light emission in the discharge space. It is in.

  In order to achieve the above object, the invention according to claim 1 is configured such that a front dielectric plate and a back dielectric plate are arranged to face each other, and a discharge space filled with a discharge gas is provided between both dielectric plates, In a flat discharge tube provided with a set of discharge electrodes for generating discharge in the discharge space, at least one of the two discharge electrodes is a transparent discharge electrode provided on the outer surface or inner surface of the front or back dielectric plate, On the transparent discharge electrode, an energizing electrode extending in a strip shape with a length of 20% or more of the entire peripheral length is provided.

  According to a second aspect of the present invention, in the first aspect of the present invention, the transparent discharge electrode is provided in a range including at least a region facing the discharge space on an outer surface or an inner surface of the front or back dielectric plate. It is characterized by that.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the energizing electrode is provided so as to extend along a peripheral edge of the transparent discharge electrode.
According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the current-carrying electrode is provided on an inner side of a peripheral portion of the transparent discharge electrode on the front or back dielectric plate. It is characterized by.

The invention according to claim 5 is the invention according to claim 4, wherein the energizing electrode is provided to bend and extend.
A sixth aspect of the present invention is the transparent discharge according to any one of the first to fifth aspects, wherein the discharge electrodes are provided on the outer surface or the inner surface of the front and back dielectric plates, respectively. Each of the transparent discharge electrodes is provided with the current-carrying electrode, and the current-carrying electrodes are provided at different positions on the front and back dielectric plates.

(Function)
According to the first and second aspects of the present invention, a current-carrying electrode extending in a strip shape of 20% or more of the entire peripheral length of the transparent discharge electrode with respect to the transparent discharge electrode having a very high electric resistance as compared with a general metal electrode. The voltage is applied to a wider range than before. For this reason, since the distance from the energizing electrode of each part in the transparent discharge electrode is made more uniform, and the voltage applied between the discharge electrodes is made as uniform as possible, the uneven light emission in the discharge space is suppressed.

  According to the invention described in claim 3, in addition to the action of the invention described in claim 1 or 2, the conductive electrode is provided on the light emitting surface by extending along the peripheral edge of the transparent discharge electrode. It is possible to prevent the current-carrying electrode from hindering light emission on the transparent discharge electrode formed.

  According to invention of Claim 4, in addition to the effect | action of the invention of Claim 1 or Claim 2, it is made for an electricity supply electrode to extend in the inner side of the peripheral part in a transparent discharge electrode. The distance from the energizing electrode of each part in the transparent discharge electrode is made more uniform than when extending along the periphery. For this reason, since the drive voltage applied to the discharge space is made more uniform, the uneven light emission in the discharge space is further suppressed.

  According to the invention described in claim 5, in addition to the operation of the invention described in claim 4, the energization electrode extends linearly by causing the energization electrode to bend and extend inside the peripheral edge of the transparent discharge electrode. Compared with the electrode, the distance from the energizing electrode of each part in each transparent discharge electrode is made uniform. For this reason, since the drive voltage applied to the discharge space is made more uniform, the uneven light emission in the discharge space is further suppressed.

  According to the invention described in claim 6, in addition to the operation of the invention described in any one of claims 1 to 5, both energized electrodes are provided at the same position between the front and back dielectric plates. Compared to the case, the sum of the distances from the respective energizing electrodes of each part in the discharge space is made uniform. For this reason, since the drive voltage applied to the discharge space is made more uniform, the uneven light emission in the discharge space is further suppressed.

  According to the present invention, the distance from the current-carrying electrode on the transparent discharge electrode is made more uniform, and the voltage applied between the discharge electrodes is made as uniform as possible, so that uneven light emission in the discharge space is suppressed. Therefore, the drive voltage can be further lowered without causing uneven light emission in the discharge space.

(First embodiment)
Next, a first embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the flat discharge tube 10 of the present embodiment has a flat box-shaped casing 11, which has a box main body 12 with one side opened, And a square plate-like lid body 13 that closes the opening of the box body 12. The box body 12 includes a flat bottom portion 14 and a frame-like side wall portion 15 erected along the periphery of the bottom portion 14. Both the box body 12 and the lid 13 are formed of a dielectric such as transparent glass, and are joined using a low-melting glass frit. In the housing 11, the lid body 13 and the bottom portion 14 of the box body 12 are parallel to each other, and are opposed to each other with an interval set by the side wall portion 15. In the present embodiment, the lid 13 forms a front dielectric plate and the bottom 14 forms a back dielectric plate. Further, a sealed discharge space 16 is formed inside the housing 11, and an inert gas (for example, xenon gas or a mixed gas containing xenon gas) as a discharge gas is sealed in the discharge space 16. A phosphor film 17 is formed on the inner surface (the upper surface in FIG. 2) of the bottom 14 of the box body 12. The box body 12 and the lid body 13 have a vertical length of, for example, 150 mm and a horizontal length of, for example, 105 mm. Further, the vertical length of the phosphor film 17 is, for example, 142 mm, and the horizontal length is, for example, 97 mm.

  A transparent discharge electrode 18 is provided on the outer surface (upper surface in FIG. 2) of the lid 13, and a transparent discharge electrode 19 is provided on the outer surface (lower surface in FIG. 2) of the bottom 14 of the box body 12. Each of the transparent discharge electrodes 18 and 19 includes a part of a region facing the side wall 15 of the box body 12 on the outer surface in a range including a region facing the discharge space 16 on the outer surface of the lid 13 and the bottom 14. It is provided in the range. The vertical length of the transparent discharge electrode 18 is 148 mm, for example, and the horizontal length is 103 mm, for example. The vertical length of the transparent discharge electrode 19 is, for example, 144 mm, and the horizontal length is, for example, 99 mm. Each of the transparent discharge electrodes 18 and 19 is formed by sputtering, vapor deposition, or coating, for example, indium tin oxide (ITO), tin oxide, or zinc oxide.

  On the outer surface (upper surface in FIG. 2) of the transparent discharge electrode 18, a strip-shaped energizing electrode 20 extending along the long side (periphery) 18a is provided. Further, on the outer surface (lower surface in FIG. 2) of the transparent discharge electrode 19, there is provided an energizing electrode 21 extending in a strip shape along its long side (periphery) 19a. The lengths of the energizing electrodes 20 and 21 are 50% or more of the lengths of the long sides 18a and 19a, and are 20% or more of the total peripheral length of the transparent discharge electrodes 18 and 19. The length of each of the energizing electrodes 20 and 21 is more preferably 30% or more of the diagonal length of the transparent discharge electrodes 18 and 19, and most preferably 40% or more. The current-carrying electrodes 20 and 21 are formed by applying silver paste and a low-melting glass frit in a paste form to the transparent discharge electrodes 18 and 19 and then firing them. Electric wires 22 for supplying power to the energizing electrodes 20 and 21 from the outside are soldered to one ends of the energizing electrodes 20 and 21, respectively. The energizing electrodes 20 and 21 may be formed by attaching a copper foil tape to the transparent discharge electrodes 18 and 19 with a conductive adhesive.

  In the flat discharge tube 10 configured as described above, a discharge state is generated in the discharge space 16 when an AC voltage is applied between the transparent discharge electrodes 18 and 19 via the current-carrying electrodes 20 and 21. The discharge gas is ionized by this discharge to generate ultraviolet rays, and the ultraviolet rays are irradiated to the phosphor film 17. As a result, visible light is generated in the phosphor film 17, and this visible light is radiated to the outside of the housing 11 through the lid 13. At this time, the energization extending in a strip shape is applied to the transparent discharge electrodes 18 and 19 made of indium tin oxide, tin oxide, zinc oxide, or the like, which has a very high electric resistance compared to a metal electrode material such as copper or aluminum. A voltage is directly applied to a wide range via the electrodes 20 and 21. For this reason, the distances from the energizing electrodes 20 and 21 of the transparent discharge electrodes 18 and 19 are made more uniform, and the drive voltage applied to the discharge space 16 is made as uniform as possible. It is suppressed.

  In addition, when the lengths of the energizing electrodes 20 and 21 are set to 20% or more of the total peripheral length of the transparent discharge electrodes 18 and 19, the minimum driving voltage value at which the light emission in the entire discharge space 16 cannot be uneven is obtained. Experiments have confirmed that the lengths of the energizing electrodes 20 and 21 are significantly lower than the case where the length of the entire peripheral length of the transparent discharge electrodes 18 and 19 is less than 20%. Further, it has been confirmed that the minimum drive voltage value is further reduced when the lengths of the energizing electrodes 20 and 21 are 30% or more of the total peripheral length of the transparent discharge electrodes 18 and 19. Further, it has been confirmed that the minimum drive voltage value is further reduced if the lengths of the energizing electrodes 20 and 21 are 40% or more of the total peripheral length of the transparent discharge electrodes 18 and 19.

Therefore, according to the present embodiment, the following effects can be obtained.
(1) Since the current-carrying electrodes 20 and 21 extending in a strip shape are provided on the transparent discharge electrodes 18 and 19, the drive voltage applied to the discharge space 16 is made as uniform as possible, so that uneven light emission in the discharge space 16 is suppressed. The Therefore, the drive voltage can be further lowered without causing uneven light emission in the discharge space 16.

  (2) The current-carrying electrodes 20 and 21 are provided so as to extend along the long sides 18a and 19a of the transparent discharge electrodes 18 and 19, respectively. For this reason, since each energization electrode 20 and 21 is located in the periphery of the outer surface of the cover body 13 used as a light emission surface, radiation | emission of the light from the fluorescent substance film 17 is not prevented.

  (3) The energizing electrodes 20 and 21 provided on the transparent discharge electrodes 18 and 19 were arranged at different positions on the lid 13 and the bottom portion 14. For this reason, compared with the case where both the energization electrodes 20 and 21 are provided in the same position, the sum of the distance from each energization electrode 20 and 21 of each part in the discharge space 16 is equalized. Accordingly, the drive voltage applied to the discharge space 16 is made more uniform, so that the uneven light emission in the discharge space 16 is further suppressed.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. In the present embodiment, both energizing electrodes 20 and 21 are different from the first embodiment. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  As shown in FIG. 3, the energizing electrode 20 of the present embodiment provided on the transparent discharge electrode 18 has a long side (periphery) 18 a and a short side (periphery) 18 b at one corner 18 c of the transparent discharge electrode 18. It is provided so as to extend in an L shape along each part. In this energizing electrode 20, the total length of the length of the portion extending along the long side (periphery) 18a and the length of the portion extending along the short side (periphery) 18b is 50% of the length of the long side 18a. The above length is 20% or more of the entire peripheral length of the transparent discharge electrode 18. The energizing electrode 21 provided on the transparent discharge electrode 19 is the same as the energizing electrode 20, and the long side is one of the corner portions 19 c of the transparent discharge electrode 19 that is in a diagonal position relative to the energizing electrode 20. It is provided so as to extend in an L shape along a part of 19a and the short side 19b.

Also according to the present embodiment, the effects described in (1) to (3) of the first embodiment can be obtained.
(Modification)
In addition, you may implement each said embodiment as follows. In each embodiment shown in FIGS. 4 to 16 below, the length (full length) of each energizing electrode 20, 21 is 20% or more of the total peripheral length of the transparent discharge electrodes 18, 19, respectively. is there.

  As shown in FIG. 4, the transparent discharge electrode 18 is provided with a conducting electrode 20 extending in a strip shape along the short side (periphery) 18b on the left side thereof, and the transparent discharge electrode 19 is provided with a lower length thereof. A conducting electrode 21 extending in a strip shape is provided along the side (periphery) 19a. The length of the energizing electrode 20 is 50% or more of the length of the short side 18b, and the length of the energizing electrode 21 is 50% or more of the length of the long side 19a. Both energization electrodes 20 and 21 are arranged at positions close to both corner portions 18c and 19c which are in a diagonal positional relationship between both transparent discharge electrodes 18 and 19, respectively.

  As shown in FIG. 5, the transparent discharge electrode 18 is provided with a conducting electrode 20 extending in a strip shape along the short side (periphery) 18b on the left side thereof, and the transparent discharge electrode 19 is provided with a short side on the right side thereof. A conductive electrode 21 extending in a strip shape is provided along the (peripheral) 19b. The lengths of the energizing electrodes 20 and 21 are 50% or more of the lengths of the short sides 18b and 19b, respectively. Both energization electrodes 20 and 21 are arranged at positions close to both corner portions 18c and 19c which are in a diagonal positional relationship between both transparent discharge electrodes 18 and 19, respectively.

  As shown in FIG. 6, the transparent discharge electrode 18 is provided with a conducting electrode 20 extending in a strip shape along the left short side 18b, and the transparent discharge electrode 19 is provided along the right short side 19b. A conductive electrode 21 extending in a strip shape is provided. The lengths of the energizing electrodes 20 and 21 are 50% or more of the lengths of the short sides 18b and 19b, respectively. Each energization electrode 20 and 21 is arrange | positioned in the center of the short sides 18b and 19b.

  As shown in FIG. 7, the energizing electrode 20 provided on the transparent discharge electrode 18 extends in a strip shape along the entire short side 18b on the right side and a part of both long sides 18a, and is formed into a "U" shape as a whole. It has become. Further, the transparent discharge electrode 19 is provided with a linear energization electrode 21 extending in a strip shape parallel to both the long sides 19a from the left short side 19b toward the right short side 19b in the central portion between the two long sides 19a. Provided. The length of the energizing electrode 21 is 50% or more of the length of the long side 19a.

  As shown in FIG. 8, the transparent discharge electrode 18 is provided with a linear conducting electrode 20 extending in a strip shape parallel to both long sides 18 a at the center between the long sides 18 a, Is provided with a linear energizing electrode 21 extending in a strip shape parallel to both short sides 19b at the center of both short sides 19b. The length of the conductive electrode 20 is 50% or more of the length of the long side 18a of the transparent discharge electrode 18, and the length of the conductive electrode 21 is 50 of the length of the short side 19b of the transparent discharge electrode 19. % Or more.

  As shown in FIG. 9, the transparent discharge electrode 18 is provided with a conducting electrode 20 extending in a strip shape along one of the long sides 18a, and the transparent discharge electrode 19 has a center between the long sides 19a. The linear energizing electrode 21 extending in a strip shape parallel to both the long sides 19a is provided. The length of each energizing electrode 20 is 50% or more of the length of the long sides 18a and 19a of the transparent discharge electrodes 18 and 19, respectively.

  As shown in FIG. 10 (a), the transparent discharge electrode 18 is slightly different from that shown in FIG. 3, and a conductive electrode 20 is provided at the upper left corner, and the transparent discharge electrode 19 has the same conductive electrode. 21 is provided at the upper right corner.

  -As shown in FIG.10 (b), the transparent discharge electrode 18 provided in the cover body 13 is provided with the electricity supply electrode 20 extended in strip | belt shape along the short side 18b of the left side. On the other hand, the bottom 14 is provided with an opaque metal discharge electrode 30 on the entire outer surface thereof. The electric wire 22 is directly soldered to the metal discharge electrode 30 on the short side on the right side thereof. Even in such a configuration, unevenness in light emission of the entire discharge space 16 is less likely to occur, so that the drive voltage can be lowered.

  As shown in FIG. 11A, the transparent discharge electrode 18 is provided with a conducting electrode 20 extending in a strip shape along the upper long side 18a. In addition, the transparent discharge electrode 19 has an L extending in a strip shape along a part of the long side 19a and a part of each of the left and right short sides 19b at corners 19c on both sides of the lower long side 19a. Character-shaped energizing electrodes 21a and 21b are provided, respectively. The total length of both energizing electrodes 21a and 21b is 20% or more of the total peripheral length of the transparent discharge electrodes 18 and 19.

  As shown in FIG. 11B, the transparent discharge electrode 18 is provided with a frame-shaped energizing electrode 20 extending in a strip shape along both the long sides (periphery) 18a and both short sides (periphery) 18b. The discharge electrode 19 is also provided with a current-carrying electrode 21 similar to the current-carrying electrode 20.

  As shown in FIG. 12 (a), the transparent discharge electrode 18 is provided with a conducting electrode 20 extending in a strip shape along the upper long side 18a, and the transparent discharge electrode 19 has both short sides 19b. An energizing electrode 21 extending in a strip shape parallel to both the short sides 19b is provided at the center between them.

  As shown in FIG. 12B, the transparent discharge electrode 18 is provided with a conducting electrode 20 extending in a strip shape along one of the left short sides 18b, and the transparent discharge electrode 19 has a lower left and an upper right. A current-carrying electrode 21 extending in a strip shape is provided between the two corners 19c that form a diagonal line with each other. That is, the energizing electrode 21 is provided so as to extend in a band shape inside the peripheral edge of the transparent discharge electrode 19. The length of the conducting electrode 21 is 50% or more of the length of the diagonal line of the transparent discharge electrode 19. In this case, the distance from the energizing electrode 21 of each part in the transparent discharge electrode 19 can be made more uniform than when the energizing electrode 21 extends along the periphery of the transparent discharge electrode 19. For this reason, since the drive voltage applied to the discharge space 16 is made more uniform, the uneven light emission in the discharge space 16 can be further suppressed.

  As shown in FIG. 13A, the transparent discharge electrode 18 is provided with a conducting electrode 20 extending in a strip shape along the upper long side 18a. The transparent discharge electrode 19 is provided with a reverse “V” -shaped energizing electrode 21 that is symmetrical with respect to the center line of both short sides 19b. That is, the energizing electrode 21 is provided so as to bend and extend inside the peripheral edge of the transparent discharge electrode 19. The entire length of the energizing electrode 21 is 50% or more of the diagonal length of the transparent discharge electrode 19. In this case, compared with the case where the energizing electrode 21 is extended linearly, the distance from the energizing electrode 21 of each part in the transparent discharge electrode 19 can be made uniform. For this reason, since the drive voltage applied to the discharge space 16 is made more uniform, the uneven light emission in the discharge space 16 can be further suppressed.

  As shown in FIG. 13 (b), the transparent discharge electrode 18 is provided with a current-carrying electrode 20a similar to the current-carrying electrode 20 shown in FIG. 3 at its upper-left corner and similarly with a current-carrying electrode 20b at its lower-right corner. ing. Further, the transparent discharge electrode 19 is provided with a current-carrying electrode 21a similar to the current-carrying electrode 21 shown in FIG. 3 at its lower right corner and similarly with a current-carrying electrode 21b at its upper left corner. That is, the diagonal direction in which both the energizing electrodes 20a and 20b are arranged intersects with the diagonal direction in which both the energizing electrodes 21a and 21b are arranged.

  As shown in FIG. 14A, each of the transparent discharge electrodes 18 and 19 forms a triangle together with a dielectric plate (not shown). The transparent discharge electrode 18 is provided with a conducting electrode 20 extending in a strip shape along the lower side thereof, and the transparent discharge electrode 19 is formed in an inverted V shape extending in a strip shape along a part of both sides constituting the upper apex thereof. A conducting electrode 21 is provided.

  -As shown in FIG.14 (b), each transparent discharge electrode 18 and 19 has comprised the circular form of the dielectric plate which is not shown in figure. The transparent discharge electrode 18 is provided with a conducting electrode 20 extending in a strip shape along the upper half of the periphery in FIG. 14B, and the transparent discharge electrode 19 is also strip-shaped along the lower half of the periphery. An energizing electrode 21 is provided.

  The present invention is embodied in a configuration in which the transparent discharge electrode 18 is provided on the inner surface of the lid body 13 (the lower surface in FIG. 15B) as shown in FIGS. 15A and 15B. In this case, the lid 13 is extended to the outside of the box body 12 together with the transparent discharge electrode 18, and the energizing electrode 20 is provided in a portion of the transparent discharge electrode 18 disposed outside the discharge space 16.

  The present invention is embodied in a configuration in which a plurality of dielectric ribs 31 are provided on the bottom 14 of the box body 12 as shown in FIG. The dielectric ribs 31 are formed integrally with the box body 12 and are provided in parallel to each other at regular intervals. The upper edge of each dielectric rib 31 is in contact with the inner surface of the lid 13. With this configuration, the distance between the inner surface of the lid 13 and the inner surface of the bottom portion 14 is kept constant. The energizing electrode 20 includes a base portion 20c extending in a strip shape along the short side 18b on the left side of the transparent discharge electrode 18, and a plurality of extending portions 20d extending from the base portion 20c in parallel with the long sides 18a. The base portion 20 c is disposed at a position facing the side wall portion 15 of the box body 12 that is out of the discharge space 16. Further, each extending portion 20 d is arranged at a position facing the upper edge of the corresponding dielectric rib 31. According to such a configuration, the distance from each energizing electrode 20 in the transparent discharge electrode 18 is made uniform, and the drive voltage applied to the discharge space 16 is made uniform, so that uneven light emission in the discharge space 16 is suppressed. In addition, the current-carrying electrode 20 does not interfere with the light radiated to the outside through the lid 13 from between the dielectric ribs 31.

The present invention may be embodied in a flat discharge tube that does not include the phosphor film 17 and generates visible light from a discharge gas by discharge in the discharge space 16.
The lid 13 and the bottom 14 (box body 12) as a dielectric flat plate are made of dielectric mineral such as mica or marble, or a dielectric synthetic resin such as polyester resin, methacrylic resin, or vinyl chloride resin. It may be formed.

Next, among technical ideas that can be grasped from the above embodiments, ideas other than those described in the claims will be described together with their effects.
(1) The flat discharge tube according to claim 3, wherein the front and back dielectric plates are quadrangular, and the energizing electrode is at least one of the upper side, the lower side, the right side, and the left side of the transparent discharge electrode. A flat-type discharge tube provided so as to extend along the line.

  (2) In the flat discharge tube according to (1) of the technical idea, the front or back dielectric flat plate has at least one of the upper side, the lower side, the right side, and the left side of the transparent discharge electrode on the conductive electrode. A flat discharge tube characterized by being provided along two or more sides.

  (3) In the flat discharge tube according to (2) of the above technical idea, the front electrode or the back dielectric flat plate is provided with at least one of the upper side, the lower side, the right side, and the left side of the transparent discharge electrode on the conductive electrode. A flat discharge tube characterized by being provided along three or more sides.

  (4) In the flat discharge tube according to (3) of the above technical idea, on the front or back dielectric flat plate, the energizing electrode is arranged along the upper side, the lower side, the right side and the left side of the transparent discharge electrode. A flat discharge tube provided. According to the configuration described in (1) to (4) above, the same effect as that of claim 3 can be obtained.

  (5) In the flat discharge tube according to any one of claims 1 to 9, the two discharge electrodes are transparent discharge electrodes provided on the outer surface or the inner surface of the front and back dielectric plates, respectively. A flat discharge tube characterized in that the transparent electrodes are provided with the conductive electrodes, and the conductive electrodes are provided at the same positions corresponding to each other on the front and back dielectric plates. According to such a configuration, the same effect as that of any one of claims 1 to 9 can be obtained.

The perspective view which shows the planar discharge tube of 1st Embodiment. The disassembled perspective view which shows a planar discharge tube. The perspective view which shows the transparent discharge electrode and energization electrode in the flat type discharge tube of 2nd Embodiment. The perspective view which shows the transparent discharge electrode and energization electrode in other embodiment. The perspective view which shows the transparent discharge electrode and energization electrode in other embodiment. The perspective view which shows the transparent discharge electrode and energization electrode in other embodiment. The perspective view which shows the transparent discharge electrode and energization electrode in other embodiment. The perspective view which shows the transparent discharge electrode and energization electrode in other embodiment. The perspective view which shows the transparent discharge electrode and energization electrode in other embodiment. (A), (b) is a perspective view which shows the transparent discharge electrode and energization electrode in other embodiment both. (A), (b) is a perspective view which shows the transparent discharge electrode and energization electrode in other embodiment both. (A), (b) is a perspective view which shows the transparent discharge electrode and energization electrode in other embodiment both. (A), (b) is a perspective view which shows the transparent discharge electrode and energization electrode in other embodiment both. (A), (b) is a perspective view which shows the transparent discharge electrode and energization electrode in other embodiment both. (A) is a front view which shows the planar discharge tube in other embodiment, (b) is the longitudinal cross-sectional view along the aa line in (a). The disassembled perspective view which shows the planar discharge tube in other embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Flat type discharge tube, 13 ... Cover body as front dielectric flat plate, 14 ... Bottom part (box main body) as back dielectric flat plate, 16 ... Discharge space, 18, 19 ... Transparent discharge electrode, 18a, 19a ... Periphery, long side as upper side and lower side, 18b, 19b ... short side as peripheral edge, right side and left side, 20, 20a, 20b, 21, 21a, 21b ... energization electrode.

Claims (6)

A planar type in which a front dielectric plate and a rear dielectric plate are arranged to face each other, a discharge space filled with a discharge gas is provided between the two dielectric plates, and a pair of discharge electrodes for discharging the discharge space is provided. In the discharge tube,
At least one of the discharge electrodes is a transparent discharge electrode provided on the outer surface or the inner surface of the front or back dielectric plate, and extends on the transparent discharge electrode in a band shape with a length of 20% or more of the entire peripheral length. A flat discharge tube provided with a current-carrying electrode.   2. The flat discharge tube according to claim 1, wherein the transparent discharge electrode is provided in a range including at least a region facing the discharge space on an outer surface or an inner surface of the front or rear dielectric plate.   The flat discharge tube according to claim 1, wherein the energizing electrode is provided so as to extend along a peripheral edge of the transparent discharge electrode.   3. The flat discharge tube according to claim 1, wherein the current-carrying electrode is provided on an inner side of a peripheral edge portion of the transparent discharge electrode on the front or back dielectric flat plate.   The flat discharge tube according to claim 4, wherein the energizing electrode is provided so as to bend and extend.   The both discharge electrodes are transparent discharge electrodes provided on the outer surface or the inner surface of the front and back dielectric plates, respectively, and the conductive electrodes are provided on the transparent discharge electrodes, respectively. The flat discharge tube according to any one of claims 1 to 5, wherein the flat discharge tube is provided at different positions on the flat plate.

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