JP2006024508A - Flat type discharge lamp and lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the starting voltage effectively in the flat type discharge lamp, while raising the withstand pressure. <P>SOLUTION: In the flat type discharge lamp 20 that is equipped with a flat type discharge container 11 in which a translucent front face substrate 1 and a rear face substrate 2 are arranged opposing each other, a discharge medium 12 sealed into the flat type discharge container 11, a slender spacer 8 installed in the gap between the front face substrate 1 and the rear face substrate 2, and the slender outer electrodes 6, 7 of an arbitrary shape installed on the inner or outer walls of the rear face substrate so as not to be contacted with the discharge medium, a layer 9 of a material with secondary electron emission effect such as MgO or the like has been formed so that it is exposed to the discharge medium 12 on the inner wall corresponding to the position where the slender outer electrode 6 or 7 of the rear face substrate 2 is formed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a flat discharge lamp and a lighting device.

  Currently, a number of flat and thin flat discharge lamps have been developed as light sources for backlights of liquid crystal display panels. This type of flat discharge lamp is required to be low in heat generation and power consumption of the discharge lamp, and is preferably driven at a low voltage due to the demand for downsizing and weight reduction of the lighting circuit.

  As a method for reducing the starting voltage of the lamp, Japanese Patent No. 3026416 (Patent Document 1), Japanese Patent Application Laid-Open No. 2003-132951 (Patent Document 2), Japanese Patent Application Laid-Open No. 2000-90884 (Patent Document 3), Japanese Patent Application Laid-Open No. 2003-92086 (Patent Document 4). As shown in FIG. 4A, a method of applying MgO in the lamp is used. MgO has a high secondary electron emission capability and has an effect of reducing the discharge voltage in the discharge space.

  Patent Document 1 and Patent Document 2 show a configuration in which an MgO layer is formed on the surface of a dielectric layer covering a pair of electrode layers provided inside a front substrate, as shown in FIG. 1 of Patent Document 2. Has been. In this case, the MgO layer is exposed to the discharge space, and the effect of reducing the starting voltage can be obtained. However, since the formation position of MgO is on the front substrate side where visible light is emitted, visible light emitted from the rear substrate or the like Is absorbed by the MgO layer, and this causes a problem of partial darkening at the MgO formation position. When a pair of electrodes are formed as in the above example, the dark part is formed at both ends of the lamp, and the dark part due to MgO is not so much noticeable in actual use. In the case of forming a plurality of pairs of electrodes to share the discharge region, a plurality of dark lines due to the MgO layer are formed on the light emitting surface, and the uniformity of light emission is lowered.

  Due to the above-mentioned problem of screen uniformity, there is known a technique that can be improved by forming a plurality of electrodes on the back substrate side when the lamp is enlarged. In Patent Document 3, as shown in FIG. 1, an MgO layer is formed on the surface of a dielectric layer that covers an electrode placed on the inner side of a back substrate, and a phosphor is applied so as to cover the MgO layer. ing. However, in this method, since the surface of the MgO layer that serves to reduce the starting voltage is covered with the phosphor layer, the effect of reducing the starting voltage of the original MgO is halved.

  In Patent Document 4, as shown in FIG. 1, a phosphor layer containing MgO powder is formed inside the back substrate. However, since MgO has a property of absorbing vacuum ultraviolet rays 147 nm and 172 nm emitted from xenon, there is a problem that the brightness of the phosphor is lowered when MgO is mixed with the phosphor. As a result, since the amount of MgO added cannot be increased, the starting voltage reduction effect is reduced.

  In addition, since the flat discharge lamp is much weaker than the cylindrical lamp, a structure that prevents implosion due to atmospheric pressure is required. However, if the thickness of the front substrate and the rear substrate is increased in order to obtain the strength, it will hinder weight reduction and thickness reduction. In view of this, a proposal has been made that a spacer is provided between the front substrate and the rear substrate to provide a withstand voltage and enable a reduction in thickness (Japanese Patent Laid-Open No. 2000-58003). However, if a spacer is provided between the front glass and the rear glass, the spacer itself does not emit light, so that the luminance of the portion where the spacer is located is lowered and uneven luminance (dark portion) occurs on the light emitting surface. As an example of occurrence of uneven brightness (dark part), when a cylindrical spacer 21 is used between the front substrate 1 and the rear substrate 2 as shown in the flat discharge lamp 20 of FIGS. 22 and 23, the front substrate 1 The portion where the spacer 21 is in contact with the spacer 21 is linearly dark and dark when viewed from the light emitting surface. 3 is a frame.

In order to solve this problem, Japanese Patent Laid-Open No. 63-232260 (Patent Document 5) proposes that the spacer itself emits light so that the spacer portion does not become uneven in luminance. This is because a cylindrical tube is used as a spacer, a fluorescent film is formed on the inner surface, a pair of electrodes are provided (internal electrode type), discharge gas is enclosed, and the cylindrical tube itself used as a spacer emits light. The light emitting surface of the flat discharge lamp is made uniform. However, if an electrode is provided inside the spacer, the uniformity of light emission is impaired due to blackening by sputtering.
Patent 3026416 JP 2003-132851 PR JP 2000-90884 PR JP 2003-92086 PR JP-A-63-232260

  The present invention has been made in view of the above problems, and in a flat discharge lamp in which an electrode is formed on the back substrate side, the starting voltage can be effectively reduced without causing a decrease in emission intensity. The purpose is to provide.

  Another object of the present invention is to provide a flat discharge lamp that can be reduced in weight and thickness without reducing its strength.

  The invention according to claim 1 is a sheet discharge vessel in which a translucent front substrate and a back substrate are arranged to face each other, and the inside is hermetically sealed, and a discharge medium sealed in the sheet discharge vessel In the flat type discharge lamp comprising an arbitrarily shaped and elongated spacer provided in a gap between the front substrate and the back substrate, and an elongated external electrode provided on the outer wall of the back substrate, the elongated shape of the back substrate A layer of a secondary electron emission effect material is formed on the inner wall of the lamp corresponding to the position where the external electrode is formed so as to be exposed to the discharge medium.

The invention according to claim 2 is the flat discharge lamp according to claim 1, wherein the secondary electron emission effect substance is MgO, Al ₂ O ₃ , BaO, SrO, CaO, BaCO ₃ , SrCO ₃ , or CaCO ₃ . It is characterized by including at least one or more.

  According to a third aspect of the present invention, in the planar discharge lamp according to the first or second aspect, the external electrode has a configuration in which electrodes to which a high voltage is applied and electrodes to which a low voltage is applied are alternately arranged. The longitudinal direction of the external electrode and the longitudinal direction of the spacer are substantially parallel, and the joint surface between the spacer and the back substrate is disposed within the maximum width of the electrode. To do.

  According to a fourth aspect of the present invention, in the flat type discharge lamp according to any one of the first to third aspects, the spacer has a square, rectangular, trapezoidal, inverted trapezoidal, tubular shape in cross section perpendicular to the longitudinal direction. , Cylindrical shape, triangular shape, inverted triangular shape, convex shape or concave shape.

  Invention of Claim 5 is the flat type discharge lamp in any one of Claims 1-4. WHEREIN: As for the said spacer, the apparent shape observed from the said back substrate side is continuous, linear, rectangular, It has a sine wave shape, a triangular wave shape, or a rectangular wave shape.

  According to a sixth aspect of the present invention, in the flat discharge lamp according to any one of the first to fifth aspects, the external electrode has a strip shape or a strip shape whose width is reduced at the central portion.

  The invention according to claim 7 is the flat discharge lamp according to any one of claims 1 to 5, wherein the external electrode meanders in a sine wave shape, a triangular wave shape or a rectangular wave shape. It is.

  The invention according to claim 8 is the flat discharge lamp according to any one of claims 1 to 7, wherein the spacer is formed integrally with the front substrate.

  According to a ninth aspect of the present invention, in the flat discharge lamp of the eighth aspect, the front substrate is formed in an uneven shape or a corrugated shape.

According to a tenth aspect of the present invention, there is provided a planar discharge vessel in which a translucent front substrate and a rear substrate are arranged to face each other and the inside is hermetically sealed, and a discharge medium sealed in the planar discharge vessel; A phosphor layer coated on at least one of the front substrate and the back substrate, an elongated spacer provided in a gap between the front substrate and the back substrate, and an optional provided on the outer wall of the back substrate An elongated external electrode in shape, and a two-electron emission effect material layer formed so as to be exposed to the discharge medium on the inner wall of the lamp corresponding to the position where the elongated external electrode of the rear substrate is formed; In the flat type discharge lamp having the above structure, at least Al ₂ O ₃ is included in the phosphor layer.

  An eleventh aspect of the present invention is the flat discharge lamp according to any one of the first to tenth aspects, wherein the spacer is a translucent hollow body, a fluorescent film is formed on the inner surface, and a rare gas is enclosed. It is characterized in that the outer electrode is installed at the end.

  According to a twelfth aspect of the present invention, in the flat discharge lamp of the eleventh aspect, the shape of the spacer is a convex lens, a concave lens, or a flat plate shape.

  A thirteenth aspect of the present invention is the flat discharge lamp according to the eleventh or twelfth aspect, wherein the spacer is made of glass or translucent ceramic.

  An illuminating device according to a fourteenth aspect is characterized in that the flat discharge lamp according to any one of the first to thirteenth aspects is used as a backlight light source of a liquid crystal display.

  According to the present invention, at a position corresponding to the external electrode formed on the outer wall of the back substrate, a secondary electron emission material such as MgO is partially applied so as to be exposed to the discharge medium, thereby starting the lamp starting voltage. As a result, the phosphor does not need to be mixed with a substance that causes a decrease in luminance, such as MgO, and the luminance of the phosphor can be improved. In addition, since the MgO layer that causes a decrease in luminance is not formed on the front substrate, the uniformity of both surfaces can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  (First Embodiment) FIG. 1 is a perspective view of an illuminating apparatus using a flat discharge lamp 20 of the first embodiment of the present invention as a light source. In the flat discharge lamp 20 according to the present embodiment, the front substrate 1 and the rear substrate 2 made of a light-transmitting glass plate are arranged facing each other at a substantially constant interval, and the periphery of the front substrate 1 and the rear substrate 2 is arranged. The flat discharge vessel 11 is formed by adhering the parts with the frit glass 4 via the side wall 3.

  Inside the flat discharge vessel 11, mercury vapor, xenon, krypton, argon, neon, and helium are used alone or mixed as a discharge medium 12 and sealed at a sealing pressure of several kPa to several hundred kPa. .

  Between the front substrate 1 and the back substrate 2, a plurality of elongated spacers 8 are arranged at a constant interval. The distance between the front substrate 1 and the back substrate 2 is kept constant, and the inside and outside of the discharge vessel 11 are maintained. Prevents damage from lamp implosion due to pressure difference. The cross-sectional shape of the spacer 8 is not only a rectangular parallelepiped as shown in FIG. 1, but a trapezoidal shape as shown in FIGS. 2 and 3, a triangular shape as shown in FIGS. 4 and 5, a circular shape as shown in FIG. Various shapes such as a tube shape as shown in FIG. 7 can be taken. The side surface shape of the spacer 8 viewed from the back substrate 2 side is an elongated and continuous structure such as a linear shape as shown in FIG. 8, a wave shape as shown in FIG. 9, and a square wave shape as shown in FIG. Alternatively, it is possible to take a disconnection shape as shown in FIG.

  Further, instead of installing the spacer 8 between the front substrate 1 and the rear substrate 2, as shown in FIG. 12, the front substrate 1 is formed in an uneven shape, and the convex portion 1b is pressed against the rear substrate 2 as a spacer. It can also function.

  As shown in FIG. 1, external electrodes 6 for applying a high voltage and external electrodes 7 for applying a low voltage are alternately arranged on the outer surface of the back substrate 2. The external electrodes 6 and 7 have, for example, a shape in which convex portions are provided on the side surfaces as in the electrode 10 in FIG. 13 and a thickness in the central portion as shown in FIG. It is possible to use various narrow shapes such as a narrow band shape or a triangular wave shape as shown in FIG. Here, L indicates the maximum width of the electrode.

  The longitudinal direction of the joint surface between the spacer 8 and the back substrate 2 is substantially parallel to the longitudinal direction of the electrodes, and the joint surface between the spacer 8 and the outer electrodes 6 and 7 exists within the maximum width L of each electrode. Are arranged as follows. Thereby, one external electrode 6 or 7 is exposed to each of the discharge spaces 13 divided by the linear spacers 8 and can act as an electrode of each discharge space 13. The electrode width of the external electrode 7 ′ provided at the end portion of the back substrate 2 is formed to be as narrow as the electrode width at which the outer surface electrodes 6 and 7 at the center are exposed to the discharge space 13.

In the discharge space 13 corresponding to the position where the electrodes 6 and 7 are formed, the secondary electron emission material 9 having a high secondary electron emission coefficient is formed so as to be directly exposed to the sealed gas. The secondary electron emission material 9 includes at least one of MgO, Al ₂ O, BaO, SrO, CaO, BaCO ₃ , SrCO ₃ , and CaO ₃ .

  As shown in FIG. 1, the secondary electron emission material 9 may be applied to almost the entire surface opposite to the position where the electrodes 6 or 7 are formed. However, as shown in FIG. It is good also as a structure divided | segmented and apply | coated.

  Phosphor layers 5a and 5b are formed inside the front substrate 1 or the back substrate 2, respectively. Regarding the formation of the phosphor 5b on the back substrate 2 side, the position between the back substrate 2 and the secondary electron emitting material 9 as shown in FIG. Alternatively, it is not applied between the back substrate 2 and the secondary electron emission material 9, and is always applied so that the secondary electron emission material 9 is exposed to the discharge space 13 side.

  Other examples of forming the flat discharge vessel 11 include a configuration in which one of the front substrate 1 and the rear substrate 2 is thermoformed in a tray shape to omit the side walls 3 and the frit glass 4 is not used. Alternatively, a method may be used in which the peripheral portion of the substrate is heated to melt the glass and adhere.

As described above, according to the first embodiment, the secondary electron emission material such as MgO is partially exposed to the discharge medium at a position corresponding to the external electrode formed on the outer wall of the back substrate. By applying, the starting voltage of the lamp can be reduced. As a result, the phosphor need not be mixed with a substance that causes a reduction in luminance, such as MgO, and the luminance of the phosphor is not reduced. Similarly, since the MgO layer that causes a reduction in luminance is not formed on the front substrate, the uniformity of the screen is not reduced. (Second Embodiment) In FIG. 1, the front substrate 1 or the back substrate 2 is not used. The phosphor layers 5a and 5b are respectively formed on the inside of the phosphor. The phosphors used for the phosphor layers 5a and 5b are mixed with Al ₂ O ₃ that emits at least initial electrons. Is used.

By doing so, the starting voltage can be reduced by about 30 to 70 V compared to a configuration not including Al ₂ O ₃ . However, even if Al ₂ O ₃ is mixed with the phosphor, including the case where there is no secondary electron emission effect material applied to the electrode portion, the effect of greatly reducing the starting voltage due to the secondary electron emission effect material cannot be obtained. The configuration of the present embodiment can reduce the starting voltage most.

Further, in the configuration of Patent Document 4 (Japanese Patent Application Laid-Open No. 2003-92086), an example in which MgO or the like is mixed with the phosphor is shown. However, MgO is yellowed when a mixed slurry with the phosphor is prepared. However, there is a problem in that the phosphor layer is discolored or the ultraviolet ray radiated from the discharge medium is absorbed to reduce the lamp brightness. On the other hand, Al ₂ O ₃ used in the present embodiment does not cause discoloration like MgO and absorbs less ultraviolet light, so that the lamp luminance reduction due to Al ₂ O ₃ mixing is less than that of MgO. There are advantages.

  (Third Embodiment) FIG. 16 is a top view of a flat discharge lamp according to a third embodiment of the present invention, FIG. 17 is a sectional view taken along line AA 'in FIG. 16, and FIG. It is an enlarged view of the point which installs. Phosphor layers 5a and 5b are provided on both the front substrate 1 and the rear substrate 2 facing each other at a predetermined interval, and a rare gas or a rare gas is introduced into the discharge space 13 between the front substrate 1 and the rear substrate 2. A plurality of mixed gases are enclosed. In the present embodiment, a pair of electrodes 10 are formed outside the discharge space 13 of the back substrate 2, but they may be installed in the discharge space 13.

  In the present embodiment, a lens is used for the spacer 21, and light incident from the back substrate 2 side is condensed through the spacer 21 at a position where the front substrate 1 and the spacer 21 are in contact with each other, and uneven luminance is generated on the light emitting surface. It has a structure that does not allow dark areas.

  The material of the spacer 21 may be glass, but may be a plastic such as acrylic resin, polycarbonate, high-density polyethylene in consideration of strength and workability. In addition, when the spacer 21 is installed between the front substrate 1 and the rear substrate 2, if the light from the rear substrate 2 is difficult to enter the lens, as shown in FIG. The spacer 22 may be interposed.

  Regarding the shape of the lens, a convex lens is illustrated in the present embodiment, but the lens is not limited to a convex lens, and may be a concave lens or a flat lens.

  By adopting such a configuration, it is possible to eliminate luminance unevenness that has occurred by using a spacer, and it is possible to obtain a flat discharge lamp having a uniform light emitting surface.

  (Fourth Embodiment) Next, a flat type discharge lamp according to a fourth embodiment of the present invention will be described with reference to FIGS. 20 is a front view of a flat fluorescent lamp according to a fourth embodiment of the present invention, and FIG. 21 is a cross-sectional view taken along line AA ′ in FIG. The feature of this embodiment is that translucent ceramic is used for the front substrate 1 and the back substrate 2 and a spacer between the substrates 1 and 2 is eliminated. Each of the front substrate 1 and the rear substrate 2 made of translucent ceramics facing each other at a predetermined interval has a phosphor layer on the inner surface, and a rare gas or a rare gas is introduced into the discharge space between the substrates 1 and 2. A plurality of mixed gases are enclosed. In the figure, 3 is a side wall. In the present embodiment, a pair of electrodes 6 are formed outside the discharge space of the back substrate 2, but may be installed in the discharge space.

  When glass materials are used for these front and back substrates, it is necessary to place a spacer between the front substrate 1 and the back substrate 2 as shown in FIG. 23 in order to prevent implosion due to atmospheric pressure. The number increases as the size of the lamp increases. On the other hand, the strength of the front substrate and the rear substrate is improved by adopting the translucent ceramic substrate as in the present embodiment, and a spacer is not interposed between both substrates as shown in FIG. And uniform light emission is obtained.

  As for the lamp weight, when soda glass is used in the conventional example, the specific gravity is 2.49. However, the front substrate 1 and the rear substrate 2 made of translucent ceramic are employed as in this embodiment. The weight of both substrates can be reduced by about 85%, and the screen size of 32 inches, which was about 1.6 kg made of glass, can be reduced to about 240 g.

Further, since the translucent ceramic is generally alumina (Al ₂ O ₃ ), which is a secondary electron emission material of 99.9% or more, a secondary electron emission material (alkali metal) for improving the startability of the lamp. Or an oxide of an alkaline earth metal) on the inner surface of the lamp, the manufacturing process can be reduced, and the dimming characteristics of the lamp can be improved. In addition, since the translucent ceramic itself is milky white, when the light emission of the lamp uses a large number of contracting positive columns, it itself functions as a diffuser plate to obtain a uniform light emitting surface. Can do.

The perspective view of the illuminating device using the planar discharge lamp of the 1st Embodiment of this invention. The perspective view which abbreviate | omitted a part at the time of using the trapezoidal cross section as a spacer in the planar discharge lamp of the said 1st Embodiment. The perspective view which abbreviate | omitted one part at the time of using the thing of an inverted trapezoid cross section as a spacer in the planar discharge lamp of the said 1st Embodiment. The perspective view which abbreviate | omitted one part at the time of using the thing with a triangular cross section as a spacer in the planar discharge lamp of the said 1st Embodiment. The perspective view which abbreviate | omitted one part at the time of using the thing of a cross-section having a reverse triangle shape as a spacer in the planar discharge lamp of the said 1st Embodiment. The perspective view which abbreviate | omitted one part at the time of using the thing with a circular cross section as a spacer in the planar discharge lamp of the said 1st Embodiment. The perspective view which abbreviate | omitted one part at the time of using the thing with a hollow circular cross section as a spacer in the planar discharge lamp of the said 1st Embodiment. Sectional drawing parallel to the longitudinal direction of a planar discharge lamp of the said 1st Embodiment with a bottom face shape being linear as a spacer. Sectional drawing parallel to the longitudinal direction of a flat discharge lamp of the said 1st Embodiment with a bottom face shape as a spacer as a spacer. Sectional drawing parallel to the longitudinal direction of the planar discharge lamp of the said 1st Embodiment whose bottom face shape is a square wave shape as a spacer. Sectional drawing parallel to the longitudinal direction of the bottom discharge shape as a spacer in the planar discharge lamp of the said 1st Embodiment. The perspective view of the modification of the flat type discharge lamp of the 1st Embodiment of this invention. Sectional drawing of the electrode which provided the convex part in the side surface used in the flat type discharge lamp of the 1st Embodiment of this invention. Sectional drawing of the electrode of the strip | belt shape which used the flat discharge lamp of the 1st Embodiment of this invention with the thickness of the center part narrowed. Sectional drawing of the electrode of a triangular wave shape used in the flat type discharge lamp of the 1st Embodiment of this invention. The top view of the flat type discharge lamp of the 3rd Embodiment of this invention. Sectional drawing in AA 'in FIG. The enlarged view of the spacer installation part in the flat type discharge lamp of the 3rd Embodiment of this invention. The enlarged view of the spacer installation part in the other example of the flat discharge lamp of the 3rd Embodiment of this invention. The rear view of the flat type discharge lamp of the 4th Embodiment of this invention. AA 'line sectional drawing in FIG. The top view of the conventional planar discharge lamp. Sectional drawing in BB 'in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front substrate 2 Back substrate 3 Side wall 4 Frit glass 5a, 5b Phosphor layer 6, 7, 7 ', 10 Electrode 8, 21, 22 Spacer 9 Secondary electron emission effect substance 11 Planar discharge container 12 Discharge medium 13 Discharge space 20 Flat discharge lamp D Luminance unevenness L Maximum electrode width

Claims (14)

A planar discharge vessel in which a translucent front substrate and a rear substrate are arranged to face each other and the inside is hermetically sealed;
A discharge medium enclosed in the planar discharge vessel;
An elongated spacer having an arbitrary shape provided in a gap between the front substrate and the rear substrate;
In a flat discharge lamp comprising an elongated external electrode provided on the outer wall of the back substrate,
A flat discharge lamp characterized in that a layer of a secondary electron emission effect material is formed on the inner wall of the lamp corresponding to a position where the elongated external electrode is formed on the rear substrate so as to be exposed to the discharge medium. . 2. The planar surface according to claim 1, wherein the secondary electron emission effect substance includes at least one of MgO, Al ₂ O ₃ , BaO, SrO, CaO, BaCO ₃ , SrCO ₃ , and CaCO _3. Type discharge lamp.   The external electrode is a configuration in which electrodes to which a high voltage is applied and electrodes to which a low voltage is applied are alternately arranged, and the longitudinal direction of the external electrode and the longitudinal direction of the spacer are substantially parallel, 3. The flat discharge lamp according to claim 1, wherein a joint surface between the spacer and the back substrate is disposed so as to be positioned within a maximum width of the electrode.   The spacer has a shape of a cross section perpendicular to a longitudinal direction thereof, which is a square, a rectangle, a trapezoid, an inverted trapezoid, a tube, a cylinder, a triangle, an inverted triangle, a convex or a concave. The flat discharge lamp in any one of 1-3.   5. The spacer according to claim 1, wherein an apparent shape observed from the back substrate side is a continuous, linear, rectangular, sine wave shape, triangular wave shape, or rectangular wave shape. A flat discharge lamp according to claim 1.   The flat discharge lamp according to any one of claims 1 to 5, wherein the external electrode has a strip shape or a strip shape whose width is reduced at a central portion.   6. The flat discharge lamp according to claim 1, wherein the external electrode meanders in a sine wave shape, a triangular wave shape, or a rectangular wave shape.   The flat discharge lamp according to claim 1, wherein the spacer is formed integrally with the front substrate.   9. The flat discharge lamp according to claim 8, wherein the front substrate is formed in a concavo-convex shape or a corrugated shape. A planar discharge vessel in which a translucent front substrate and a rear substrate are arranged to face each other and the inside is hermetically sealed;
A discharge medium enclosed in the planar discharge vessel;
A phosphor layer applied to at least one of the front substrate and the rear substrate;
An elongated spacer provided in a gap between the front substrate and the rear substrate;
An elongated electrode having an arbitrary shape provided on the outer wall of the back substrate;
A flat discharge lamp comprising a two-electron emission effect material layer formed on the inner wall of the lamp corresponding to a position where the elongated external electrode of the rear substrate is formed, and exposed to the discharge medium. ,
The flat discharge lamp, wherein the phosphor layer contains at least Al ₂ O ₃ .   11. The spacer according to claim 1, wherein the spacer is a light-transmitting hollow body, a fluorescent film is formed on an inner surface thereof, a rare gas is sealed and hermetically sealed, and an external electrode is installed at an end portion. A flat discharge lamp according to claim 1.   The flat discharge lamp according to claim 11, wherein the spacer has a convex lens shape, a concave lens shape, or a flat plate shape.   The flat discharge lamp according to claim 11 or 12, wherein a material of the spacer is glass or translucent ceramic. 14. A lighting device, wherein the flat discharge lamp according to claim 1 is used as a backlight light source of a liquid crystal display.

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