JP2006114271A - Fluorescent lamp, backlight unit, and liquid crystal television - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dielectric barrier discharge lamp in which scratches and cracks of an external electrode hardly occur and corona discharge is hardly generated, and which has the external electrode with a lifetime not inferior to that of other portions. <P>SOLUTION: This is a fluorescent lamp which is provided with external electrodes 102, 103 formed by surrounding by a conductive paste on the outer circumference face at the end part of a glass bulb 101 of which both ends are sealed. Metal members 104, 105 of cap-shape or sleeve-shape connected by surrounding at least a part of the outer circumference face of the external electrodes 102, 103 are provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a dielectric barrier discharge lamp including an external electrode on an outer periphery of an end portion of a tubular glass bulb.

  In recent years, the spread of large-sized liquid crystal televisions is remarkable, and the demand for direct-type backlight units (hereinafter referred to as “LCBL units”) used in large-sized liquid crystal televisions is increasing.

  A cold cathode tube is generally used as the light source for the LCBL unit, but the use of other light sources is being studied due to various circumstances such as the need for the same number of high-frequency electronic ballasts to light multiple lamps. Yes.

  Here, the dielectric barrier discharge lamp has a merit that a plurality of lamps can be lit by a single high-frequency electronic ballast, and thus is suitable as a light source of an LCBL unit in which, for example, 16 lamps are used.

As shown in FIG. 8, a conventional dielectric barrier discharge lamp 90 is a straight glass bulb 91 that is a discharge envelope as a means for preventing damage to the outer surface of the electrode portion at both ends of the dielectric barrier discharge lamp. A phosphor 92 applied on the inner surface of the glass bulb, mercury 93 and a rare gas 94 for buffering such as neon and argon enclosed in the straight glass bulb 91, and outer peripheral surfaces 95a and 95b at both ends of the glass bulb. In addition, external electrodes 96a and 96b made of conductive resin formed in a cylindrical shape, and C-shaped metal members 97a and 97b having spring elasticity and connected to surround outer peripheral surfaces of the external electrodes 96a and 96b. It is comprised (refer patent document 1).
JP 2003-17005 A

  However, according to the study by the present inventors, a problem that corona discharge occurs when the lamp is lit when a high voltage of 1.0 to 3.0 kV is applied between the external electrodes.

  That is, the external electrodes 96a and 96b made of conductive resin formed in a cylindrical shape on the outer peripheral surfaces 95a and 95b at both ends of the glass bulb are separated from the surface of the glass bulb 91 due to a difference in thermal expansion with the glass bulb 91 when the lamp is turned on. However, since the cylindrical surfaces of the external electrodes 96a and 96b that are thermally expanded by the spring elastic force of the metal members 97a and 97b are pressed, the conductive resin of the external electrodes 96a and 96b may be cracked.

  Further, in order to form the external electrodes 96a, 96b in a cylindrical shape on the outer peripheral surfaces 95a, 95b at both ends of the glass bulb, generally, the outer peripheral surface of the glass bulb 91 in a region other than where the external electrodes 96a, 96b are formed is formed. It is conceivable that the glass bulb 91 is rotated by masking with a tape or the like and applied to the outer peripheral surface of the glass bulb 91 by a spray method or a brush coating method.

  In these methods, as shown in FIG. 9, the external electrodes 96a and 96b made of conductive resin cause uneven coating in the tube axis direction of the glass bulb 91, and the conductive resin of the external electrodes 96a and 96b. When the C-shaped metal members 97a, 97b having spring elasticity are attached to the outer peripheral surfaces of the external electrodes 96a, 96b, the maximum unevenness of the application unevenness of the conductive resin (resin lump by spray method) Concentrated weight is applied to the convex portions and the convex portions of the brush streaks due to the brush application method), and cracks A may occur in a part of the conductive resin.

  As a result, in the above-described cracked portions of the conductive resin of the external electrodes 96a and 96b, there is an air layer gap h between the inner surfaces of the metal members 97a and 97b and the outer peripheral surfaces 95a and 95b of the glass bulb 91. Directly facing each other, corona discharge occurs between the inner surfaces of the metal members 97 a and 97 b and the outer peripheral surfaces 95 a and 95 b of the glass bulb 91. When corona discharge occurs, ozone is generated. The ozone rapidly deteriorates the external electrodes 96a and 96b made of a conductive resin and a resin member around the lamp (not shown). there is a possibility. As a result, there has been a problem that resin members used in ozone fluorescent lamps, backlight units, liquid crystal televisions, and the like deteriorate and have a short life.

  The present invention has been made in view of the above-mentioned problems, makes it difficult to cause scratches and cracks in the external electrode, suppresses the occurrence of corona discharge when the lamp is lit, and compares it with the life of other parts. An object of the present invention is to provide a fluorescent lamp, a fluorescent lamp unit, a backlight unit, and a liquid crystal television provided with external electrodes having an inferior lifetime.

  In order to achieve the above object, a fluorescent lamp according to the present invention is a fluorescent lamp comprising an external electrode formed by surrounding an outer peripheral surface of an end portion of a glass bulb sealed at both ends with a conductive paste, A cap-shaped or sleeve-shaped metal member surrounding and connecting at least a part of the outer peripheral surface of the external electrode is provided.

  In order to achieve the above object, a backlight unit according to the present invention is a direct-type backlight unit used in a liquid crystal television, and turns on a plurality of fluorescent lamps and a plurality of fluorescent lamps 1 And a plurality of high-frequency electronic ballasts.

  In order to achieve the above object, a liquid crystal television according to the present invention is a liquid crystal television including a direct backlight unit, and the backlight unit includes a plurality of fluorescent lamps and a plurality of fluorescent lamps. One high frequency electronic ballast that is all lit is included.

  The configuration described in the means for solving the problems makes it difficult to cause scratches and cracks in the external electrode, suppresses the generation of corona discharge when the lamp is lit, and reduces the amount of ozone generated. It is possible to provide a fluorescent lamp, a backlight unit, and a liquid crystal television provided with an external electrode having a lifetime comparable to that of the portion.

(Embodiment 1)
FIG. 1 is a diagram showing an outline of a liquid crystal television according to Embodiment 1 of the present invention.

  A liquid crystal television 10 shown in FIG. 1 is, for example, a 32-inch liquid crystal television, and includes a liquid crystal screen unit 11 and a backlight unit 12.

  The liquid crystal screen unit 11 includes a color filter substrate, a liquid crystal, a TFT substrate, a drive module and the like (not shown), and forms a color image based on an image signal from the outside.

  The backlight unit 12 is an LCBL unit and includes one high-frequency electronic ballast 13 and 16 dielectric barrier discharge lamps 100. Further, the socket base 50 as shown in FIG. 2 holds both ends of the 16 dielectric barrier discharge lamps 100 on the electrode socket 51 and the electrode socket 52 made of elastic stainless steel, phosphor bronze or the like to light the lamp. Is. The width D of the holding portions of the electrode socket 51 and the electrode socket 52 is designed to be a size that can be held in the region of the external electrodes 102 and 103 described below in order to suppress the occurrence of corona discharge when the lamp is lit. ing.

  The high-frequency electronic ballast 13 is a lighting circuit that lights all 16 dielectric barrier discharge lamps 100.

  FIG. 3A is a diagram showing an outline of the dielectric barrier discharge lamp 100 according to Embodiment 1 of the present invention.

  As shown in FIG. 3A, the dielectric barrier discharge lamp 100 according to the first embodiment of the present invention has an external electrode 102 formed of a conductive paste on the outer periphery of the end of a glass bulb 101 sealed at both ends. , 103, and a material such as phosphor bronze, stainless steel, etc. that has good electrical connectivity and is connected by surrounding at least a part of the outer peripheral surface of the external electrodes 102, 103. For example, in this embodiment, the glass bulb 101 and Cap-shaped metal members 104 and 105 made of, for example, Fe-Ni-Co (Kovar) having a similar thermal expansion coefficient are provided, and end portions 104a and 105a of the metal members 104 and 105 on the glass bulb center side are arranged on the glass bulb center side. An interval L is provided, for example, by 1 mm from the position of the external electrode ends 102a and 103a to the glass bulb end 101b side.

The glass bulb 101 has a substantially circular cross section when cut along a plane perpendicular to the tube axis. On the inner surface of the glass bulb 101, red (Y ₂ O ₃ : Eu ³⁺ ), green (LaPO ₄ : Ce ³⁺ , Tb ³⁺ ) and blue (BaMg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ ) phosphors The mixed rare earth phosphor is applied to form a phosphor film 106 having a thickness of 10 μm to 20 μm. The glass bulb 101 is filled with a rare gas 107 such as argon and neon having a pressure of about 8 kPa and about 2 mg of mercury 108. The glass bulb 101 is a discharge envelope made of, for example, borosilicate glass. In the present embodiment, the glass bulb 101 is a straight glass bulb having an outer diameter of 4.0 mm, an inner diameter of 3.0 mm, and a total length of 720 mm.

  FIG. 3B is a diagram illustrating an appearance of the metal member 104.

  The metal member 104 is the same as the metal member 105. The metal member 104 is formed in such a shape that a cylindrical hemisphere is covered with a hemispherical dome. In order to give the metal member 104 an elastic force, for example, two slits 109 in the longitudinal direction are provided. , And the metal member 104 is connected to the external electrode using the elastic force of the slit 109.

  The metal member 104 and the metal member 105 are mounted from the end portion 101 b of the glass bulb 101. Since the end portions 104a and 105a of the metal members 104 and 105 are chamfered so as not to have an acute angle portion as shown in FIG. 3, it is easy to mount from the end portion of the glass bulb 101 and the external electrode 102 is provided. , 103 is less likely to cause scratches on the outer peripheral surface.

  Note that the metal members 104 and 105 do not have a fixed shape like metal foils and metal tapes, and are reshaped when force is applied from the outside, considering reduction of scratches on the outer peripheral surfaces of the external electrodes 102 and 103. Unlike a plastic member that retains its shape even when force is applied, it is a non-plastic metal member that has a fixed shape and does not easily change its shape even when force is applied from the outside.

  In the present embodiment, the metal member 104 and the metal member 105 have, for example, a total length of 23.0 mm, an outer diameter φ4.5 mm of the cylindrical portion, an inner diameter φ4.1 mm, and a wall thickness of 0.2 mm. Thus, since it is not necessary to have plasticity, it can be set thick so that scratches do not easily occur.

  Here, since the outer diameter of the glass bulb 101 is φ4.0 mm, and the inner diameters of the metal members 104 and 105 are φ4.3 mm, the average gap between the glass bulb 101 and the metal members 104 and 105 is 0.15 mm.

The external electrodes 102 and 103 have a predetermined length from one end of the glass bulb 101, for example, silver paste, which is a conductive paste, by a dipping method in advance as described below at both ends of the sealed glass bulb 101. For example, it is formed and adhered to a total length of 25.0 mm. Note that the conductive paste of the external electrodes 102 and 103 is not limited to silver paste, and nickel paste, gold paste, palladium paste, or carbon paste may be used. In addition, low melting point glass is preferable as a binder in the conductive paste in consideration of strong adhesion to the surface of the glass bulb 101, and the amount containing 1 to 10% by weight is preferable, and the specific resistance is about 10%. Those of ^-1 to 10 ^-6 Ω · cm are preferred.

  Next, with reference to FIG. 4 and FIG. 5, the procedure of the bonding process of the sealed glass bulb, the external electrode, and the metal member will be described.

  (1) As shown in FIG. 4 (a), a silver paste is diluted with a diluent such as hexane, the diluted silver paste solution is accommodated in a container 60, and both ends are sealed by dipping. A portion in the vicinity of the bulb 101 excluding one end portion (center portion side) is sandwiched by the first jig 61, the one end portion of the glass bulb 101 is lowered, and a predetermined length is placed in the container 60 containing the silver paste liquid. Mmm is immersed, and the silver paste 62a is attached to one end of the glass bulb 101 (step S1). At this time, the external electrode 102 of the silver paste 62a formed on the glass bulb 101 can directly contact the silver paste liquid with a constant pressure on the outer peripheral surface of the glass bulb 101, as compared with the spray method or the brush coating method of the prior art. It is possible to stably reduce unevenness in the tube axis and the radial direction.

  (2) As shown in FIG. 4 (b), after raising the glass bulb 101, for example, the tunnel-type heating furnace 63 (conditions of the heating furnace) with the glass bulb 101 held between the first jig 61 Passes a processing temperature of about 100 ° C. and a processing time of about 1.5 minutes, and temporarily fixes the silver paste 60a to one end of the glass bulb 101 (step S2).

  (3) After returning to normal temperature, the glass bulb 101 is removed from the first jig 61. Next, as shown in FIG.4 (c), the part (center part side) of the vicinity except the other end part is clamped with the 1st jig | tool 61, and the other end part of this glass bulb 101 is attached by the dip method. The predetermined length Mmm is immersed in the container 60 in which the silver paste liquid is accommodated, and the silver paste 62b is attached to the other end of the glass bulb 101 (step S3). At this time, since the external electrode 103 of the silver paste 62b formed on the glass bulb 101 can directly contact the silver paste liquid at a constant pressure on the outer peripheral surface of the glass bulb 101 as compared with the spray method or brush coating method of the prior art. It is possible to stably reduce unevenness in the tube axis and the radial direction.

  (4) As shown in FIG. 4D, with the glass bulb 101 held between the first jig 61, for example, a tunnel-type heating furnace 63 (conditions of the heating furnace are a processing temperature of 620 ° C. and a processing time. About 1 minute), and the silver pastes 62a and 62b adhering to both ends of the glass bulb 101 are permanently fixed (step S4).

  (5) As shown in FIG. 5, a second jig 64 having a protrusion 65 having a width slightly larger than the opening width on the slit 109 side is used, and the protrusion 65 is used to make a hemispherical dome-shaped metal. The opening end of the member 104 on the slit 109 side is widened and the metal member 104 is held by the second jig 64. While maintaining this state, the glass bulb 101 is then lowered and one end of the glass bulb 101 is inserted into the opening of the metal member 104 held by the second jig 64, and then the second jig 64. Thus, the metal member 104 is removed, and the metal member 104 is fixed to one end of the glass bulb 101 (step S5). At this time, since an equally distributed load due to the elastic force of the cap-shaped metal member 104 is applied to the outer peripheral surface of the silver paste 62a, the silver paste 62a is not cracked.

  (6) Similarly, using the protrusion 65 of the second jig 64, the opening end on the slit 109 side of the hemispherical dome-shaped metal member 105 is widened to hold the metal member 105 on the second jig 64. To do. After the other end of the glass bulb 101 is inserted into the held opening of the metal member 105, the metal member 105 is removed by the second jig 64, and the metal member 105 is fixed to the other end of the glass bulb 101. Thereby, the straight dielectric barrier discharge lamp 100 can be manufactured (step S6). At this time, since an equally distributed load is applied to the outer peripheral surface of the silver paste 62b by the elastic force of the cap-shaped metal member 105 on the outer peripheral surface of the silver paste 62b, no cracks are generated in the silver paste 62b.

  Next, the function and effect of the dielectric barrier discharge lamp 100 will be described.

  In the first embodiment of the present invention, at least a part of the outer peripheral surface is surrounded by the external electrodes 102 and 103 formed using conductive paste on the outer periphery of the end of the glass bulb 101 sealed at both ends. By providing the cap-shaped metal members 104 and 105 connected in this manner, the external electrodes 102 and 103 are less likely to be peeled off and cracked due to a difference in thermal expansion from the glass bulb 101 when the lamp is lit. As a result, there is no air space gap h (see FIG. 9) between the inner surface of the metal members 104 and 105 or the inner surfaces of the external electrodes 102 and 103 and the outer peripheral surface of the glass bulb 101. It is possible to provide a fluorescent lamp, a backlight unit, and a liquid crystal television provided with an external electrode that can suppress the occurrence of discharge and have a lifetime that is inferior to that of other portions.

  In addition, since the external electrodes 102 and 103 are formed on the outer peripheral surface of the end portion of the glass bulb 101 by a dip method using a conductive paste, the tube axis and the radial direction are compared with the conventional spray method or brush coating method. The unevenness of coating can be reduced. As a result, when the cap-shaped metal members 104 and 105 are attached to the outer peripheral surface of the conductive paste that is the external electrodes 102 and 103, an evenly distributed load is applied to the outer peripheral surface of the conductive paste, so that the conductive paste is cracked. It becomes difficult, and generation | occurrence | production of the corona discharge at the time of lamp lighting can be suppressed further.

  Further, the end portions 104a and 105a of the metal members 104 and 105 on the center side of the glass bulb 101 are spaced from the positions of the external electrode ends 102a and 103a on the center side of the glass bulb 101 toward the glass bulb end portion 101b. Since it is installed, it is possible to suppress the occurrence of corona discharge during lamp lighting between the end portions of the metal members 104 and 105 and the outer peripheral surface of the glass bulb 101.

  Further, the end portions 104a and 105a of the metal members 104 and 105 on the center side of the glass bulb 101 are installed with a distance L of 1 mm or more from the external electrode ends 102a and 103a. Even if there exists, it can suppress that the corona discharge at the time of lamp lighting generate | occur | produces between the edge part of the metallic members 104 and 105 and the outer peripheral surface of the glass bulb | bulb 101. FIG.

  Further, since the metal members 104 and 105 surround the external electrodes 102 and 103 with a length of 3 mm or more, the metal members 104 and 105 at both ends of the dielectric barrier discharge lamp 100 are the electrode sockets 51 of the socket base 50. The electrode socket 52 is stably connected and held, and the lamp can be turned on.

  In addition, since the end portions 104a and 105a of the metal members 104 and 105 on the center side of the glass bulb 101 are chamfered, the metal members 104 and 105 can be easily attached from the end portion of the glass bulb 101, and the external portions are attached at the time of attachment. It is possible to make it difficult to damage the outer peripheral surfaces of the electrodes 102 and 103.

  Further, the metal members 104 and 105 are formed from the end portion of the glass bulb 101 by forming two or more slits 109 in the longitudinal direction and connecting them to the external electrodes 102 and 103 by the elastic force of the metal members 104 and 105. The members 104 and 105 can be easily attached, and the outer peripheral surfaces of the external electrodes 102 and 103 can be hardly damaged during the attachment.

  Further, by using the conductive paste as the external electrodes 102 and 103, the adhesion with the glass bulb 101 is improved, and the first formed by the glass bulb 101 corresponding to each of the external electrode 102 and the external electrode 103. The capacitances of the first capacitor and the second capacitor can be made substantially equal.

  In addition, by including 1 to 10% by weight of low melting point glass in the conductive paste as the external electrodes 102 and 103, the metal members 104 and 105 are attached to the outer peripheral surfaces of the external electrodes 102 and 103 from the end of the glass bulb 101. In this case, it is possible to make it difficult to damage the outer peripheral surfaces of the external electrodes 102 and 103.

(Embodiment 2)
FIG. 6 shows an outline of a dielectric barrier discharge lamp 200 according to the second embodiment of the present invention. This embodiment is different from the first embodiment by, for example, a dip method using a rotating roller, that is, an electrode. A silver paste temporarily attached to a rotating roller having a dimensional width is transferred to the outer peripheral surfaces of both ends of the glass bulb 101 and provided with external electrodes 202 and 203 formed in a cylindrical shape, and the metal members 204 and 205 have a sleeve shape (cylindrical shape). The cylindrical metal members 204 and 205 are inserted from the end of the glass bulb 101 by the shrinking method, and the metal members 204 and 205 are closely connected to the external electrodes 202 and 203, and the sleeve-shaped Both ends 204 a and 204 b of the metal member 204 (or both ends 205 a and 205 b of the sleeve-shaped metal member 205) are connected to both ends 202 a of the external electrode 202. 202b (or both ends 203a of the external electrodes 203, 203b) from the inside, respectively, the point that is located at a distance L different.

  In addition, the same number is attached | subjected to the component similar to the dielectric barrier discharge lamp 100 in Embodiment 1, and the description is abbreviate | omitted.

  According to this embodiment, it is possible to suppress the occurrence of corona discharge when the lamp is lit between the ends of the metal members 204 and 205 and the outer peripheral surface of the glass bulb 101, compared with the lifetime of other parts. It is possible to provide a fluorescent lamp, a backlight unit, and a liquid crystal television provided with external electrodes having a long life. Further, both end portions 204a and 204b of the metal member 204 (or both end portions 205a and 205b of the metal member 205) are attached to the both ends 202a and 202b (or the external electrodes) of the external electrode 202 even if there is variation in the tube axis direction X. When the lamp is lit between the glass member 101 and the metal members 204a and 204b of the metal member 204 (or both ends 205a and 205b of the metal member 205) Generation of corona discharge can be suppressed. Further, since the cylindrical metal members 204 and 205 are connected to the external electrodes 202 and 203 by the shrinking method, the adhesion of the cylindrical metal members 204 and 205 to the external electrodes 202 and 203 is improved, and the electric Connection is stabilized.

(Embodiment 3)
FIG. 7 shows an outline of a dielectric barrier discharge lamp 300 according to the third embodiment of the present invention. This embodiment is different from the second embodiment in that the thin metal member 304 winds the external electrode 202 around. And the point which is formed in the shape of a sleeve differs by crushing the part of the thin-body near the both ends. The metal member 304 is the same as the metal member 305 provided at the opposite end. In addition, the same number is attached | subjected to the component similar to the dielectric barrier discharge lamp 200 in Embodiment 2, and the description is abbreviate | omitted.

  According to this embodiment, it is possible to suppress the occurrence of corona discharge when the lamp is lit between the end portion of the metal member 304 and the outer peripheral surface of the glass bulb 101, which is inferior to the lifetime of other portions. It is possible to provide a fluorescent lamp, a backlight unit, and a liquid crystal television each having an external electrode with no lifetime. In addition, both end portions 304a and 304b of the metal member 304 are spaced from the both end portions 202a and 202b of the external electrode 202 even if there are variations in the tube axis direction X. Generation of corona discharge when the lamp is lit between 304a and 304b and the glass bulb 101 can be suppressed. Furthermore, the metal member 304 can be easily attached by an inexpensive thin body even if the outer diameter of the glass bulb 101 fluctuates because the external electrode 202 provided with the glass bulb 101 is wound and attached.

  Note that the external electrodes and metal members provided at both ends of the glass bulb 101 are not limited to the same shape at both ends, and may be combined with any one of the first embodiment, the second embodiment, and the third embodiment. .

  The present invention can be widely applied as any lighting including a direct backlight unit used in a liquid crystal television. According to the present invention, it is possible to provide a dielectric barrier discharge lamp that is unlikely to cause scratches or peeling of the external electrode, hardly generates corona discharge, and has a life that is inferior to that of other parts. It can contribute to extending the life of TVs and its industrial utility value is extremely high.

The figure which shows the outline | summary of the liquid crystal television in Embodiment 1 of this invention The figure which shows the outline | summary of the socket stand 50 in the same Embodiment 1. (A) is a figure which shows the outline | summary of the dielectric barrier discharge lamp 100 in the same Embodiment 1, (b) is a figure which shows the external appearance of the metal member 105. Diagram showing outline of glass bulb manufacturing process Diagram showing outline of glass bulb manufacturing process The figure which shows the outline | summary of the dielectric barrier discharge lamp 200 in Embodiment 2 of this invention. The figure which shows the outline | summary of the dielectric barrier discharge lamp 300 in Embodiment 3 of this invention. The figure which shows the outline | summary of the conventional typical dielectric barrier discharge lamp 90 The figure explaining the subject of the dielectric barrier discharge lamp 90

Explanation of symbols

100 Dielectric barrier discharge lamp 101 Glass bulb 102, 103 External electrode 104, 105 Metal member

Claims (14)

A fluorescent lamp comprising an external electrode formed by surrounding an outer peripheral surface of a glass bulb sealed at both ends with a conductive paste, and surrounding and connecting at least a part of the outer peripheral surface of the external electrode A fluorescent lamp comprising a cap-shaped or sleeve-shaped metal member. The fluorescent lamp according to claim 1, wherein the external electrode is formed by a dip method using a conductive paste. The end of the metal member on the glass bulb center side is disposed at a distance from the position of the external electrode end on the glass bulb center side to the glass bulb end side. The fluorescent lamp according to claim 1 or 2. 4. The fluorescent lamp according to claim 3, wherein an end portion of the metal member on a central side of the glass bulb is installed at the end of the external electrode with the interval being 1 mm or more. 5. The fluorescent lamp according to claim 1, wherein the metal member surrounds the external electrode with a length of 3 mm or more and is connected to the external electrode. 6. The fluorescent lamp according to any one of claims 1 to 5, wherein an end portion of the metal member on a central side of the glass bulb is chamfered. 7. A metal member formed in a sleeve shape is provided by winding a thin body around the external electrode and crushing portions near both ends of the thin body. The fluorescent lamp according to any one of the above. The metal member is inserted from the end of the glass bulb using a shrinking method, and the metal member is connected to the external electrode. Fluorescent lamp. The fluorescent lamp according to any one of claims 1 to 6, wherein the metal member is formed by forming a slit in a longitudinal direction and is connected to an external electrode by an elastic force of the metal member. . The fluorescent lamp according to any one of claims 1 to 9, wherein the conductive paste is any one of a silver paste, a nickel paste, a gold paste, a palladium paste, and a carbon paste. The fluorescent lamp according to claim 10, wherein the conductive paste contains 1% by weight or more of the low-melting glass. A backlight unit comprising the fluorescent lamp according to any one of claims 1 to 11 as a light source. A direct-type backlight unit used in a liquid crystal television, comprising a plurality of fluorescent lamps according to any one of claims 1 to 11 and a single high-frequency electron that lights all of the plurality of fluorescent lamps. A backlight unit comprising a ballast. A liquid crystal television including a direct-type backlight unit, wherein the backlight unit turns on a plurality of fluorescent lamps according to any one of claims 1 to 11 and all of the plurality of fluorescent lamps. A liquid crystal television comprising one high-frequency electronic ballast.

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