JPWO2009081590A1 - Power supply terminal, cold cathode discharge lamp with the power supply terminal, backlight unit including the cold cathode discharge lamp, and liquid crystal display device including the backlight unit - Google Patents

Abstract

A power supply attached to the end of a cold cathode discharge lamp having a tubular glass container 6 and an external lead wire 10B sealed to the end of the glass container 6 and extending outward in the tube axis direction. A terminal 2 that is externally attached to the outer periphery of the end portion of the glass container 6, and is provided on the body portion 16, and the external lead wire 10 </ b> B is clamped by an elastic restoring force in a state where the external lead wire 10 </ b> B is inserted. With the configuration having the elastic clamping portion 112, the electrical connection with the lead wire 10 is ensured, and the power supply capable of preventing the glass tube from being damaged when the cold cathode discharge lamp 4 is provided. Provide terminal 2 etc.

Description

  The present invention relates to a power supply terminal and the like, and more particularly to a power supply terminal for attaching a cold cathode discharge lamp to, for example, a connector of a backlight unit.

  A cold cathode fluorescent lamp, which is a kind of cold cathode discharge lamp, is suitable for reducing the diameter, and is therefore suitably used as a light source for a backlight unit that is required to be thin (downsized). To facilitate the attachment of the cold cathode fluorescent lamp to the backlight unit and the electrical connection between the lead wires at both ends of the cold cathode fluorescent lamp and the lighting power supply, power supply terminals are provided at both ends of the cold cathode fluorescent lamp. It is done.

  The power supply terminal includes a cylindrical main body portion and a lead wire connecting portion extending from the main body portion. The main body is extrapolated to the end of a hermetically sealed glass tube in the cold cathode fluorescent lamp, and the lead wire connecting portion is electrically connected to the lead wire.

  When the power supply terminal having the above configuration is used, the cold cathode fluorescent lamp can be attached to the backlight unit with one touch by fitting the main body of the power supply terminal into the connector provided in the backlight unit. Power can be supplied from the lighting power source via the power supply terminal.

  Here, it goes without saying that the lead wire connecting portion in the power supply terminal is an important part for reliably supplying power from the lighting power source to the cold cathode fluorescent lamp, and various structures have been proposed heretofore.

  For example, in Patent Document 1, an end portion of a strip-shaped connection piece extending in the tube axis direction of the glass tube from a main body portion is folded at a right angle, and a lead wire insertion hole is provided in the folded portion. It is disclosed. Then, in a state where the lead wire is inserted into the insertion hole, solder is poured so as to fill a gap between the lead wire and the insertion hole, and the two are electrically connected.

By doing in this way, a lead wire and a connection piece will be electrically connected reliably via solder.
JP 2007-234551 A

  However, although solder has a function as a joining member, its mechanical strength is generally low. Therefore, for example, when an external force is applied to the main body in the tube axis direction, the solder may be peeled off from one member, or the solder itself may be broken, and the conduction between the lead wire and the connection piece cannot be obtained. It can happen.

  In order to cope with this problem, it is conceivable that the tip of the connecting piece is formed in an appropriate shape and the tip is caulked to the lead wire. (A radial force) is applied, and a crack (damage) is expected to occur in the glass tube portion holding the lead wire.

  The present invention has been made in view of the above-described problems, and assures electrical connection with the lead wire as much as possible, and prevents damage to the glass tube when it is provided in a cold cathode discharge lamp. It is an object of the present invention to provide a power supply terminal that can be used, a cold cathode discharge lamp having the power supply terminal, and the like.

  In order to achieve the above object, a power supply terminal according to the present invention is a cold glass having a tubular glass container and a lead wire sealed to the end of the glass container and extended outward in the tube axis direction. A power supply terminal attached to an end portion of the cathode discharge lamp, and a body portion externally attached to an outer periphery of the end portion of the glass container, and an elastic restoring force provided in the body portion and the lead wire being inserted And an elastic clamping part for clamping the lead wire.

  Further, the elastic clamping portion includes at least two elastic piece portions extending from the main body portion, and an abutting portion provided at each distal end portion of the elastic piece portion and in contact with the outer periphery of the lead wire. Thus, in a state before the lead wire is inserted, a contact portion with the lead wire in the contact portion exists radially inside the virtual outer peripheral surface of the lead wire.

  Alternatively, the main body portion has a cylindrical shape, and the elastic pinching portion extends from the main body portion and has at least two slits opened in the tube axis direction, and the conical body And a contact portion that contacts the outer peripheral surface of the lead wire, a taper screw is provided on a part of the outer surface of the cone portion, and the power supply terminal further includes the taper It has a ring nut screwed with a screw.

  In addition, the contact portion of the contact portion is formed in a shape suitable for the outer peripheral surface of the lead wire, and is in surface contact with the outer periphery of the lead wire.

  Furthermore, in the state where the lead wire is inserted into the elastic clamping portion, the contact portion presses the lead wire with a pressing force of at least 100 [gf] by the elastic restoring force.

  In order to achieve the above object, a cold cathode discharge lamp according to the present invention comprises a tubular glass container and a lead wire sealed to the end of the glass container and extended outward in the tube axis direction. A cold-cathode discharge lamp with a power supply terminal having a power supply terminal attached to an end of the glass container, wherein the power supply terminal is the above-described power supply terminal, and the main body is an end of the glass container The lead wire is inserted in the outer periphery and the lead wire is inserted in the elastic clamping part.

  In order to achieve the above object, a backlight unit according to the present invention includes the cold cathode discharge lamp with a feeding terminal as a light source.

  In order to achieve the above object, a liquid crystal display device according to the present invention includes a liquid crystal display panel and the backlight unit disposed on the back surface of the liquid crystal display panel.

  According to the power supply terminal having the above-described configuration, the elastic pinching portion is electrically connected by pinching the lead wire with an elastic restoring force in a state where the lead wire is inserted. Therefore, the above-described problem caused by the presence of solder or the like for electrical connection between the two is unlikely to occur. Therefore, electrical connection can be reliably performed.

  Further, since the lead wire can be clamped by the elastic clamping portion by insertion, an excessive force is not easily applied to the lead wire when the power supply terminal is attached to the cold cathode discharge lamp. Therefore, the glass tube can be prevented from being damaged when it is provided in the cold cathode discharge lamp.

1 is a partially cutaway perspective view of a cold cathode fluorescent lamp including a power supply terminal according to Embodiment 1. FIG. It is the longitudinal cross-sectional view of the one end part part of the said cold cathode fluorescent lamp, and a right view. It is a figure which shows the power feeding terminal of Embodiment 1, (a) is a perspective view of the power feeding terminal before mounting | wearing with a glass container, (b) is a perspective view of the power feeding terminal after mounting | wearing, (c) is a clip part. diagram for explaining a clearance S _1, S ₂ of the free end portion and the portion other than the clip portion of the main body portion of, (d) the width of the gap portion between the outer surface of the inner surface and the glass container body portion it is a diagram for explaining the S _3. 6 is a diagram showing a power supply terminal according to a modification of the first embodiment. FIG. It is a figure which shows the example which provided the stopper in the said electric power feeding terminal, and has shown the contact part of the said electric power feeding terminal and a part of elastic piece part corresponding to this, (a) is a front view, (b) (A) is a cross-sectional view AA, (c) is a right side view. (A), (b) is a figure which shows the modification of the said electric power feeding terminal. (A), (b) and (c), (d) are the figures which show the modification of the said electric power feeding terminal, respectively. 6 is a diagram showing a power supply terminal according to Embodiment 2. FIG. 6 is a diagram illustrating a power supply terminal according to Embodiment 3. FIG. It is the front view and right view of the one end part part of the cold cathode fluorescent lamp with which the electric power feeding terminal which concerns on Embodiment 4 was mounted | worn. FIG. 10 is a diagram illustrating a power supply terminal according to a fifth embodiment. It is a figure which shows before and after mounting | wearing with the cold cathode fluorescent lamp of the electric power feeding terminal which concerns on Embodiment 5. FIG. FIG. 10 is a diagram illustrating a power supply terminal according to a sixth embodiment. FIG. 10 is a diagram illustrating a power supply terminal according to a seventh embodiment. It is a figure which shows the backlight unit which concerns on embodiment. It is a figure which shows the attachment structure to the envelope of the cold cathode fluorescent lamp in the said backlight unit. It is a figure which shows an example of an electric power feeding terminal and a connector. It is a figure which shows a cross section in the state in which the electric power feeding terminal shown in FIG. 17 was inserted in the connector. It is a figure which shows an example of an electric power feeding terminal and a connector. It is a figure which shows a cross section in the state in which the electric power feeding terminal shown in FIG. 19 was inserted in the connector. It is a figure which shows an example of an electric power feeding terminal. It is a figure which shows an example of an electric power feeding terminal and a connector. It is a partially cutaway perspective view showing a liquid crystal display device according to an embodiment.

Explanation of symbols

2, 80, 110, 120, 140, 160, 180, 190, 196 Feed terminal 4 Cold cathode fluorescent lamp 6 Glass container 10 Lead wire 16, 112, 122, 142 Main body 18, 52, 54, 60, 68, 82 , 162,182 Elastic clamping part

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
<Embodiment 1>
FIG. 1 is a partially cutaway perspective view showing a schematic configuration of a power supply terminal 2 according to the first embodiment and a cold cathode fluorescent lamp 4 in which the power supply terminal 2 is provided at both ends thereof. FIG. FIG. In addition, the scale between each structural member is not unified in all the figures including FIG. 1, FIG.

  The cold cathode fluorescent lamp 4 has a glass container 6 having a circular cross section. The glass container 6 is a container that is hermetically sealed with lead wires 10 to be described later sealed at both ends of the glass tube. The glass container 6 is not limited to a straight tube shape as shown in the figure, but may be a bent shape such as a U-shaped tube, a U-shaped tube, an S-shaped tube, a W-shaped tube, or a spiral tube. I do not care. Further, the cross section of the glass container (glass tube) is not limited to a circular shape, and may be a flat shape such as an ellipse.

  The glass container 6 is made of borosilicate glass for sealing a tungsten wire. As an example of the dimensions, the total length is 730 [mm], the outer diameter is 4 [mm], and the inner diameter is 3 [mm]. The material of the glass container 6 is not limited to borosilicate glass, but may be lead glass, lead-free glass, soda lime glass, or other soft glass.

  Inside the glass container 6, a mixed gas of about 1200 [μg] mercury (not shown) and about 8 [kPa] (20 [° C.]) neon and argon as a rare gas is Ne: 95 [mol%]. ], Ar: 5 [mol%] is enclosed. Note that the rare gas may contain krypton. In this case, infrared radiation of the cold cathode discharge lamp can be suppressed. Furthermore, it is preferable that krypton is contained in the rare gas within a range of 0.5 [mol%] to 5 [mol%]. In this case, infrared radiation of the cold cathode discharge lamp can be suppressed without greatly changing the lamp voltage. For example, for example, argon is in the range of 0 [mol%] to 9.5 [mol%], neon is in the range of 90 [mol%] to 95.5 [mol%], and krypton is 0.5 [mol%]. %] Or more and 5 [mol%] or less. Furthermore, it is more preferable that krypton is contained in the rare gas within a range of 0.5 [mol%] to 3 [mol%]. Furthermore, it is even more preferable that krypton is contained in the rare gas in the range of 1 [mol%] to 3 [mol%].

A phosphor film 8 is formed on the inner surface of the glass container 6. The phosphor film 8 includes three kinds of rare earth phosphors of blue (B), green (G), and red (R), and emits white light as a whole. In this example, europium activated barium magnesium aluminate [BaMg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ ] (abbreviation: BAM-B) is used for the blue phosphor, and cerium terbium coactivated lanthanum phosphate is used for the green phosphor [ LaPO ₄ : Ce ³⁺ , Tb ³⁺ ] (abbreviation: LAP), europium-activated yttrium oxide [Y ₂ O ₃ : Eu ³⁺ ] (abbreviation: YOX) is used for the red phosphor.

  The lead wire 10 is a connection between an internal lead wire 10A made of tungsten and an external lead wire 10B made of nickel. The lead wire 10 has an inner lead wire 10A portion sealed at the end of the glass container 6, and the outer lead wire 10B extends outward from the sealed portion in the tube axis direction. Both the internal lead wire 10A and the external lead wire 10B have a circular cross section. For example, the inner lead wire 10A has a wire diameter of 0.8 [mm] and a total length of 3 [mm], and the outer lead wire 10B has a wire diameter of 0.6 [mm] and a total length of 4 [mm]. When glass container 6 is borosilicate glass for sealing Kovar wire, internal lead wire 10A is preferably made of an alloy of iron, nickel, and cobalt (Kovar) or molybdenum. When the glass container 6 is lead-free glass or soda glass, the internal lead wire 10A is preferably made of an alloy of iron and nickel or a jumet wire.

  An electrode 12 is joined by laser welding or the like to the inner end of the inner lead wire 10A sealed to the end of the glass container 6 on the inner side of the glass container 6. The electrode 12 is a so-called hollow electrode having a bottomed cylindrical shape, and is obtained by processing a niobium rod. The reason why the hollow electrode is used as the electrode 12 is that it is effective for suppressing sputtering in the electrode caused by the discharge during lamp lighting (for details, see Japanese Patent Application Laid-Open No. 2002-289138). The material used for the electrode 12 is not limited to niobium, and may be nickel, tantalum, molybdenum, tungsten, or the like. The electrode 12 and the internal lead wire 10A may be welded via a brazing material made of nickel foil or Kovar foil, for example.

An electron emissive material layer (not shown) may be formed on the surface of the electrode 12. In this case, the lamp voltage can be lowered compared to a lamp not provided with an electron emissive material layer. Since the power supply terminal 2 described later is provided, the heat generated in the electrode 12 can be easily dissipated through the power supply terminal 2, thereby suppressing an excessive increase in the temperature around the electrode 12, and the electrode 12. By suppressing mercury from being reduced in the vicinity, sputtering of the electron-emitting material layer can be suppressed, and the effect of reducing the lamp voltage can be maintained compared to a lamp in which the power supply terminal 2 is not provided.
Specifically, the electron emissive material layer is formed, for example, on the inner surface of the electrode. The electron emissive material layer includes, for example, a rare earth element. This is because the cold cathode discharge lamp is effective for lowering the lamp voltage. Furthermore, the rare earth element is more preferably one or more of lanthanum (La) and yttrium (Y).

The electron-emitting material layer may be any one of silicon (Si), aluminum (Al), zirconium (Zr), boron (B), zinc (Zn), bismuth (Bi), phosphorus (P), and tin (Sn). It is preferable that 1 or more types are included. In this case, the lamp voltage reduction effect can be further sustained.
Furthermore, a cesium (Cs) compound may be included in the electron-emitting material layer. In this case, the dark start characteristics of the lamp can be further improved. In addition to the electron-emitting material layer, a cesium compound may be attached to the inner surface or outer surface of the electrode 12.

  As the cesium compound, for example, it is preferable to use at least one of cesium sulfate, cesium aluminate, cesium niobate, cesium tungstate, cesium molybdate, and cesium chloride.

  A feeding terminal 2 is attached to the end of the glass container 6.

3A is a perspective view of the power supply terminal 2 before being attached to the glass container 6, FIG. 3B is a perspective view of the power supply terminal 2 after being attached, and FIG. FIG. 3D is a diagram for explaining the gaps S ₁ and S ₂ between the free end portion and the portion other than the clip portion 20 of the main body portion 16. It shows a diagram for explaining a width S ₃ of the gap portion between each.

  The power supply terminal 2 includes a main body portion 16 that is externally attached to the outer periphery of the end portion of the glass container 6, and an elastic clamping portion 18 that extends from the main body portion 16 and clamps the lead wire 10 (external lead wire 10 </ b> B). The power supply terminal 2 is obtained by pressing (sheet metal processing) a metal plate such as stainless steel. In addition, when using stainless steel, SUS304 is preferable from a viewpoint of corrosion resistance and spring property. Moreover, you may use not only stainless steel but other metal materials, such as phosphor bronze, spring steel, and beryllium steel.

  The main body 16 has a cylindrical shape. Clip portions 20 are formed on the cylindrical wall of the main body portion 16 at three locations at equal intervals in the circumferential direction. Each of the clip portions 20 is formed of a tongue piece formed by a substantially U-shaped cut inserted in the longitudinal direction with respect to the cylindrical wall. The free end portion of the tongue piece separated from the main body portion is bent in a “<” shape toward the inside as shown in the figure, and starts from the base end portion connected to the main body portion 16. The whole is bent inward (plastically deformed). When the main body portion 16 having the above configuration is extrapolated to the outer periphery of the end portion of the glass container 6, the top of the “<” shape of the free end portion abuts the outer periphery of the glass container 6, and the entire clip portion 20 The glass container 6 is elastically bent (elastically deformed) outwardly in the radial direction of the glass container 6 with the base end as a base point, and the glass container 6 is held by the restoring force. Thereby, the glass container 6 is positioned in the main body portion 16 in a state where the cylindrical main body portion 16 and the substantially axial center coincide with each other.

Needless to say, the shape, number, arrangement position, and the like of the clip portion 20 are not limited to those described above. In short, any configuration that can elastically support the glass container 6 in the main body 16 may be used. For example, as shown in FIG. 3B, the clip portion has the base end portion of the tongue piece located on the tube end side in the tube axis direction of the glass container 6, and the free end portion of the tongue piece of the glass container 6. As shown in FIG. 4, the base end portion of the tongue piece is located on the tube center portion side in the tube axis direction of the glass container 6 as shown in FIG. The free end portion of the tongue piece may be a clip portion 20a in a direction positioned on the tube end side in the tube axis direction of the glass container 6, and the clip portion 20 in the direction shown in FIG. A configuration in which clip portions in both directions are mixed, such as alternating clip portions 20a in the directions shown in FIG. In addition, it is preferable that the contact part with the clip part 20 in the glass container 6 is the tube axis direction center part side of the glass container 6 rather than the sealing part of the glass container 6. In this case, the power feeding terminal 2 can be attached to the glass container 6 in a stable state while avoiding a sealing portion whose shape tends to be unstable. A gap is preferably provided between the free end portion of the clip portion 20 and the portion of the main body portion 16 other than the clip portion 20. In this case, it is possible to prevent the free end portion from being caught by the main body portion 16 when the power feeding terminal 2 is transferred. Furthermore, as shown in FIG. 3 (c), the gap S ₁ along the direction out tongue extending the free end portion is more preferably 0.1 [mm] or more. Even more preferably, the gap S ₁ is in the range of 0.2 [mm] to 1.0 [mm]. Further, as shown in FIG. 3 (d), the clearance S ₂ direction end side out tongue extending the free end portion is more preferably 0.2 [mm] or more. Even more preferably, the gap S ₂ is in the range of 0.3 [mm] to 1.0 [mm].
The width S ₃ of the gap portion between the inner and outer surfaces of the glass container 6 of the main body portion 16 is preferably at 0.1 [mm] or more. In this case, the glass container 6 can be easily inserted into the main body portion 16. Furthermore, the width S ₃ of the gap between the inner surface of the main body 16 and the outer surface of the glass container 6 is more preferably in the range of 0.1 [mm] to 0.5 [mm]. Even more preferably, it is in the range of 0.1 [mm] or more and 0.3 [mm] or less.

  Two elastic piece portions 22 and 24 having a long and narrow strip shape are extended from the main body portion 16 so as to face each other, and contact portions 26 and 28 extend from the end portions of the elastic piece portions 22 and 24. It is installed.

  The elastic pieces 22 and 24 are bent in such a direction that the base end is the base point and the free end approaches the tube axis.

  The contact portions 26, 28 have an arc-shaped cross section, and the inner peripheral surfaces 26 A, 28 A, which are contact portions that directly contact the outer peripheral surface of the lead wire 10, are the surface and the outer peripheral surface of the lead wire 10. It is formed in a shape that matches the outer peripheral surface shape of the lead wire 10 so as to come into contact.

  In addition, before the lead wire 10 is inserted between the contact portions 26 and 28, the contact portions 26A and 28A are radially inward of the virtual outer peripheral surface of the lead wire 10 (external lead wire 10B) indicated by a one-dot chain line. Exist.

  When the power supply terminal 2 having the above configuration is extrapolated to the cold cathode fluorescent lamp 4 from the main body portion 16 side, the main body portion 16 in the radial direction with respect to the glass container 6 by the function of the clip portion 20 as described above. Relatively positioned. The elastic clamping portion 18 is expanded outward in the radial direction of the lead wire 10 with the insertion of the lead wire 10 (external lead wire 10B), and the lead wire 10 is clamped by its restoring force. Thereby, the lead wire 10 and the elastic clamping part 18 are electrically connected, and as a result, the lead wire 10 and the main-body part 16 are electrically connected. Further, since the inner side of the elastic pieces 22 and 24 also functions as a guide member for guiding the lead wire 10 to the contact portions 26 and 28, the leading end portion of the lead wire 10 is smoothly inserted between the contact portions 26 and 28. The Rukoto.

  In this way, since the electrical connection is achieved simply by inserting the lead wire 10 into the elastic pinching portion 10 in the axial direction, an excessive force on the lead wire 10 (perpendicular to the axial center of the lead wire 10). Directional force) hardly acts. Therefore, damage to the glass container 6 holding the lead wire 10 can be prevented. Further, even if a force in the tube axis direction of the glass container 6 is applied to the power supply terminal 2, the elastic clamping portion 18 (contact portions 26, 28) only slides in the tube axis direction, so that it is returned to its original position. Thus, the electrical connection state is maintained.

  If the pressing force against the external lead 10B by the contact portions 26 and 28 is at least 100 [gf] regardless of the contact area, the lamp current flowing during lighting is about 4 [mA] to 18 [mA]. It has been confirmed that a good electrical connection can be realized in the cold cathode discharge lamp. Since it is not related to the contact area, the contact form between the contact part and the external lead may be point contact, line contact, or surface contact, and applies to the power supply terminals according to all the embodiments described later. It is. In this example, the pressing force (restoring force) can be adjusted as appropriate depending on the material, shape (length, cross section), and the like of the elastic pieces 22 and 24.

  Here, the length L (length along the tube axis of the glass container 6) shown in FIG. 2 of the elastic clamping part 18 has the preferable range of 1.5 [mm]-7 [mm].

Further, when either one of the contact portions 26 and 28 is separated from the lead wire 10 for some reason, the lead wire 10 becomes a so-called cantilever beam having a sealing portion by the glass container 6 as a fixed end. In this case, it has been experimentally known that the lead wire 10 (external lead wire 10B) does not undergo plastic deformation when the bending moment at the fixed end of the lead wire 10 is 1.5 [kgf · mm] or less. Note that an external lead wire made of Ni (nickel) and having a diameter of 0.6 [mm] was used for the experiment. Further, the diameter of the external lead wire 10B is not limited to 0.6 [mm], and may be, for example, 0.8 [mm] which is the same as that in the above embodiment.

  Further, as shown by a two-dot chain line in FIG. 3, the guide member 23 that guides the lead wire 10 (external lead wire 10 </ b> B) to the contact portions 26 and 28 when the power supply terminal 2 is attached to the glass container 6. 25 may be provided. The guide members 23, 25 are located between the outer circumferential elastic pieces 22, 24 of the main body portion 16, and extend from the cylindrical wall of the main body portion 16 in the direction in which the tip portions are close to each other.

  Further, in order to facilitate the relative positioning of the power supply terminal 2 with respect to the cold cathode fluorescent lamp 4 in the tube axis direction, a stopper may be provided on the power supply terminal.

  FIGS. 5A and 5B are views showing a part of the elastic piece 22 corresponding to the one abutting portion 26 in the power supply terminal 2 provided with a stopper. FIG. 5A is a front view, and FIG. Section AA, (c) shows a right side view. The two-dot chain line indicates the external lead wire 10B.

  In this example, the stopper 30 is configured by bending a strip extending from the contact portion 26 at a right angle.

  In this way, the power supply terminal 2 can be relative to the cold cathode fluorescent lamp 4 in the tube axis direction only by extrapolating the power supply terminal 2 to the cold cathode fluorescent lamp 4 until the tip of the external lead wire 10B contacts the stopper 30. Positioning will be performed. The stopper may be provided not only on the contact portion 26 but also on the contact portion 28.

  Further, in the above example, the elastic clamping part 18 is constituted by the two elastic clamping piece parts 22 and 24 and the contact parts 26 and 28 provided in each, but the elastic clamping part part of the elastic clamping part The number is not limited to two and may be three or more. If the number is increased, the number of contact points with the lead wire increases, and the electrical connection becomes more reliable. In any case, the elastic clamping piece portions are preferably provided at equal intervals in the circumferential direction of the main body portion.

(Modification 1)
FIG. 6 is a diagram illustrating a modification of the power supply terminal 2 according to the first embodiment. In FIG. 6, the same components as those of the power supply terminal 2 described above are denoted by the same reference numerals, and description thereof is omitted.

  (1) In the power supply terminal 2 (FIG. 3), the elastic pieces 22 and 24 have a straight shape, but the elastic pieces 32 and 34 shown in FIG.

  (2) FIG. 6B shows a modification of the contact portion, and is a view seen from the tube axis direction with the power supply terminal mounted on the cold cathode fluorescent lamp. The abutting portions 26 and 28 (FIGS. 2 and 3) are different from each other in cross-sectional shape, and the abutting portions 36 and 38 shown in FIG. It is a simple shape. By doing in this way, even if it is a thin lead wire (external lead wire), the shape as a contact part is securable.

(Modification 2)
FIG. 7 is a diagram illustrating a modification of the power supply terminal 2 according to the first embodiment. 7A and 7C are views seen from the tube axis direction in a state where the power supply terminal is mounted on the cold cathode fluorescent lamp. 7B is a perspective view of the distal end portion of the power feeding terminal 2 shown in FIG. 7A, and FIG. 7D is a perspective view of the distal end portion of the power feeding terminal 2 shown in FIG. 7C. is there. In FIG. 7, the same components as those of the power supply terminal 2 described above are denoted by the same reference numerals, and description thereof is omitted.

  Each of the power supply terminals 2 shown in FIG. 7 has a configuration in which a contact portion is caulked to a lead wire in order to ensure electrical more reliable connectivity.

  The contact portions 40 and 42 shown in FIGS. 7A and 7B are examples in which the cross-sectional shapes of both contact portions are different. Then, by caulking the portion of the contact portion 40 that is not in contact with the lead wire 10 in the direction of the arrow shown in FIG. 7B, more reliable electrical connection can be obtained, and mechanically This will prevent the lead wires from coming off.

The contact portions 44 and 46 shown in FIGS. 7C and 7D are examples in which the lateral cross-sectional shape is asymmetrical. Then, by caulking the portions of the contact portions 44 and 46 that are not in contact with the lead wire 10 in the direction of the arrow shown in FIG. 7D, more reliable electrical connection can be obtained, and mechanical In addition, the lead wire is prevented from coming off.
<Embodiment 2>
FIG. 8 shows power supply terminals 48 and 53 according to the second embodiment. The power supply terminals 48 and 53 according to the second embodiment are different from the first embodiment in the configuration of the elastic clamping portion. In FIG. 8, the same components as those of the power supply terminal 2 described above are denoted by the same reference numerals, and description thereof is omitted.

  A power supply terminal 48 shown in FIG. 8A extends from the cylindrical wall of the main body portion 16 in parallel with the central axis 16A, and is a strip-like connection portion 50 folded at a right angle in the middle. And an elastic clamping part 52 provided at the extended end. The elastic clamping portion 52 includes a base portion 52A that is a rectangular plate-shaped portion orthogonal to the central axis 16A, and a pair of elastic piece portions 52B and 52C extending from the base portion 52A.

  Each of the elastic piece portions 52B and 52C has a strip shape extending from the opposite side portion of the base portion 52 to the main body portion 16 side. The elastic pieces 52B and 52C are bent in a “<” shape toward the inside (toward the central axis 16A), and the lead wire 10 (FIGS. 1 and 2) is connected between the tops of the bent portions. Hold elastically. In this example, the base 52A plays the same role as the stopper 30 (FIG. 5).

  Since the external lead wire 10B is in point contact with the elastic piece portions 52B and 52C, the power supply terminal 48 having the above-described configuration is configured so that the external lead wire 10B is not tilted with respect to the glass container 6 (FIG. 1). It effectively escapes between the tops, and an excessive force is hardly applied to the external lead wire 10B.

  Moreover, since the elastic clamping part 52 is excellent in the insertion / removal property of the lead wire 10B, the attachment / detachment property to the glass container 6 of the electric power feeding terminal 48 improves.

  The elastic pinching portion 54 of the power supply terminal 53 shown in FIG. 8B has basically the same configuration as the elastic pinching portion 52 described above. That is, it is composed of a pair of elastic pieces 54B and 54C extending from the base 54A. What is characteristic is that a single belt-like portion extending from the main body portion 16 including the connecting portion 56 is bent at a predetermined position in the longitudinal direction. For this reason, in the electric power feeding terminal 53, the material which comprises the elastic clamping part 54 itself can be decreased, and weight reduction can be achieved as a whole.

  Moreover, the point which is excellent in the insertion property to the elastic clamping part 54 of the external lead wire 10B is the same as that of the elastic clamping part 52 (Fig.8 (a)). On the other hand, the external lead wire 10 </ b> B has a structure that is difficult to be removed from the elastic clamping portion 54. When the external lead wire 10B is pulled out from the elastic clamping portion 54, the connecting portion 56 bends inward (toward the central axis 16A). As a result, the elastic piece portion 54C is similarly displaced inward and presses the external lead wire 10B, and the frictional force increases between the elastic piece portion 54C and the external lead wire 10B. Therefore, once the power supply terminal 53 is attached to the glass container 6, it can be suitably used when it is not necessary to remove it.

Also in this example, the base 54A plays the same role as the stopper 30 (FIG. 5).
<Embodiment 3>
FIG. 9 shows a power supply terminal 58 according to the third embodiment. The power supply terminal according to the third embodiment is also different from the first embodiment in the configuration of the elastic clamping portion. In each of FIGS. 9A to 9D, what is drawn on the right side is a right side view of only the elastic clamping portion. In FIG. 9 as well, the same components as those of the power supply terminal 2 described above are denoted by the same reference numerals, and description thereof is omitted.

  Each of the elastic clamping portions 60 and 64 shown in FIGS. 9A and 9B has an arcuate cross section. The elastic clamping portion 60 is an example in which the arc extends from both ends to the end, and the elastic clamping portion 64 is curved in a direction away from each other from the both ends of the arc to the end. It is an example.

  The elastic clamping parts 60 and 64 are connected to the main body part 16 by connecting parts 62 and 66, respectively.

  The elastic clamping portions 68 and 72 shown in FIGS. 9 (c) and 9 (d) are formed in a shape in which the center of the cross section having a generally “U” shape is bulged in an arc shape. is there. The elastic pinching portion 68 is an example in which the arc extends from both ends to the end, and the elastic pinching portion 72 is curved in a direction away from each other from the both ends of the arc to the end. It is an example.

  The elastic clamping portions 68 and 72 are connected to the main body portion 16 by connecting portions 70 and 74, respectively.

In addition, in the state where the lead wire 10 is inserted, the radius of the arc is adjusted so that the inner surface of the arc-shaped portion of the elastic clamping portions 60, 64, 68, 72 is in surface contact with the outer peripheral surface of the lead wire 10. It is set equal to the radius of the external lead wire 10B). Then, in a state in which the lead wire 10 is not inserted, the arc-shaped portion is plastically deformed to be generally recessed. In this way, when the lead wire 10 is inserted, the elastic clamping portions 60, 64, 68, 72 are elastically deformed and expanded outward in the radial direction of the lead wire 10, and the restoring force causes the lead. The wire 10 is pinched. <Embodiment 4>
FIG. 10 shows a power supply terminal 80 according to the fourth embodiment. FIG. 10A is a front view of the cold cathode fluorescent lamp 4 attached to the power supply terminal 80, and FIG. 10B is a right side view thereof.

  Since the main body of the power supply terminal 80 has basically the same configuration as that of the main body 16 of the power supply terminal 2 according to the first embodiment, the same reference numerals are given and description thereof is omitted.

  The elastic clamping portion 82 includes a pair of elastic piece portions 84 and 86 and contact portions 88 and 90 extending from the elastic piece portions 84 and 86, respectively.

  The pair of elastic piece portions 84 and 86 constitute a conical portion 96 having two slits 92 and 94 extending from the main body portion 16 and opened in the tube axis direction of the glass container 6.

A tapered screw 98 is provided on the outer surface of the cone portion 96. The power supply terminal 80 has a ring nut 100 that is screwed with the tapered screw 98.

  When the ring nut 100 is tightened in a state where the power supply terminal 80 having the above configuration is externally inserted into the cold cathode fluorescent lamp 4 (the external lead wire 10B is inserted between the contact portions 88 and 90), an elastic piece is obtained. The portions 84 and 86 are deformed inward as a whole, and both contact portions 88 and 90 are in contact with the external lead wire 10B. Further, by tightening the ring nut 100, both the contact portions 88 and 90 are pressed against the external lead wire 10B, thereby holding the external lead wire 10B.

  In addition, in a state before the ring nut 100 is screwed, an elastic restoring force of the elastic piece portions 84 and 86 may be applied to already hold the external lead wire 10B. Alternatively, the ring nut 100 may be screwed. For example, the external lead wire 10B may be clamped for the first time in a tightened state.

  In the above example, the conical portion has two slits. However, the number of slits to be opened is not limited to two and may be three or more.

Furthermore, it is good also as forming the slit connected with the slit formed in the cone part on the main-body-part side. For example, in FIG. 10A, a pair of slits 102 as indicated by the alternate long and short dash line may be provided at positions facing each other on the cylindrical wall of the main body portion 16 (the other slit does not appear in the figure). ). By doing in this way, the holding force of the glass container 6 by the main body part 16 can also be adjusted by the degree of tightening by the ring nut 100. In particular, it is advantageous when the power supply terminal 80 is used for a plurality of sizes of cold cathode fluorescent lamps having different diameters of the glass container 6.
<Embodiment 5>
FIG. 11 shows a power supply terminal 110 according to the fifth embodiment. The power supply terminal 110 according to the fifth embodiment is different from the first embodiment in the configuration of the main body. In FIG. 11, the same components as those of the power supply terminal 2 described above are denoted by the same reference numerals, and description thereof is omitted.

  The main body portion 112 of the power supply terminal 110 is provided with a plurality of (in this example, six) slits 114 from one end of the cylindrical body along the central axis thereof at regular intervals in the circumferential direction to a predetermined depth in the central axis direction. As a result, a plurality of (six in this example) elastic pieces 118 are extended from one end of the cylindrical body 116 where the slit 114 is not formed (the slit 114 does not reach). It is set as the structure formed.

  Each of the elastic pieces 118 is bent inward as a whole from the vicinity of the base end portion on the cylindrical body portion 116 side, and further, in the vicinity of the free end portion, locally in a “<” shape. It is bent. The reason why the glass container 6 is bent in a “<” shape is that the glass container 6 is not damaged at the corner of the tip of the elastic piece 118 when the power supply terminal 110 is extrapolated to the cold cathode fluorescent lamp. It is to do.

  Here, the diameter of the imaginary cylinder inscribed in the top of each elastic piece 118 that protrudes to the inside (the surface side of the glass container 6) of the “<”-shaped bent part is set to be shorter than the outer diameter of the glass container 6. ing.

  FIG. 12 is a diagram illustrating a state before and after mounting of the power supply terminal 110 to the cold cathode fluorescent lamp 4.

When the power supply terminal 110 having the above-described configuration is extrapolated to the end of the cold cathode fluorescent lamp 4, the top of each elastic piece 118 comes into contact with the outer periphery of the glass container 6, and the entire elastic piece 118 is The glass container 6 is elastically bent (elastically deformed) outwardly in the radial direction of the glass container 6 with the base end as a base point, and the glass container 6 is held by the restoring force. As a result, the glass container 6 is positioned in the main body portion 112 in a state where the cylindrical body portion 116 and the substantially axial center coincide with each other. Needless to say, the shape, number, arrangement position, and the like of the elastic pieces 118 (slits 114) are not limited to those described above. In short, any configuration that can elastically support the glass container 6 in the main body 112 may be used.
<Embodiment 6>
FIG. 13 shows a power supply terminal 160 according to the sixth embodiment. 13A shows a front view of the power supply terminal 160, and FIG. 13B shows a right side view thereof.

  Since the main body of the power supply terminal 160 has basically the same configuration as that of the main body 16 of the power supply terminal 2 according to the first embodiment, the same reference numerals are given and description thereof is omitted.

  The elastic clamping part 162 provided in the main body part 16 is manufactured by stamping a metal disk having a spring property (for example, a stainless steel plate) by press working, and its peripheral part is formed by laser welding or the like. It is joined to the end of the.

  The disc-shaped elastic clamping portion 162 has a central portion punched into a shape as shown in FIG. 13B, and a plurality (three in this example) projecting toward the center of the circle. Tongue pieces 162A, 162B, 162C. The tip portions (free end portions) of the tongue pieces 162A, 162B, and 162C have sharp cut surfaces that are press-cut. Needless to say, the tongue pieces 162A, 162B, and 162C are elastic pieces.

  The diameter d2 of the imaginary circle in contact with the tip of each of the tongue pieces 162A, 162B, 162C is set smaller than the diameter d1 of the external lead wire 10B.

  FIG. 13C is a front view showing a state where the power supply terminal 160 is fitted into the cold cathode fluorescent lamp 2 from the main body 160 side. In FIG. 13C, the elastic clamping portion 162 is drawn in a cross-sectional view cut at a position corresponding to the line BB shown in FIG.

  When the power supply terminal 160 is fitted into the cold cathode fluorescent lamp 2 from the main body 160 side, the tongue pieces 162A, 162B, and 162C bend with their base ends as base points, and the external lead wire 10B is held from three directions by the restoring force. To do. Further, since the tip portions of the tongue pieces 162A, 162B, and 162C, that is, the portion that contacts the external lead wire 10B are sharp edges, the tip portion bites into the outer peripheral surface of the external lead wire 10B.

  In this way, by causing the tongue pieces 162A, 162B, and 162C to bite into the outer peripheral surface of the external lead wire 10B, the contact area of the contact portion with the external lead wire 10B increases, and oxidation of the contact portion is prevented. Therefore, the reliability of electrical connectivity is improved.

Needless to say, the number and shape of the tongue pieces (elastic pieces) are not limited to those described above. <Embodiment 7>
FIG. 14 shows a power supply terminal 180 according to the seventh embodiment. FIG. 14A shows a front view of the power supply terminal 180, and FIG. 14B shows a right side view thereof.

  Since the main body portion of the power supply terminal 180 is basically the same in configuration as the main body portion 16 of the power supply terminal 2 according to the first embodiment, the same reference numerals are given and description thereof is omitted.

  The elastic clamping portion 162 provided in the main body portion 16 is manufactured by forming a metal disk (for example, a spring steel plate) into a shallow cup shape by pressing and punching the bottom portion into a predetermined shape. The bottom peripheral edge is joined to the end of the main body 16 by laser welding or the like. The elastic clamping portion 162 is a so-called tapping nut, and has a configuration in which a pair of tooth portions 182A and 182B are opposed to the bottom portion and project. The facing distance d3 between the tooth portions 182A and 182B shown in FIG. 14B is set shorter than the outer diameter of the external lead wire 10B.

As shown in FIG. 14C, when the power supply terminal 180 having the above configuration is fitted into the cold cathode fluorescent lamp 2 while rotating in the direction of arrow C from the main body 160 side, the teeth 182A and 182B A screw is formed on the outer periphery of the external lead wire 10B. Further, the tooth portions 182A and 182B are slightly bent with the base end portion as a base point, and the external lead wire 10B is held by the restoring force. Since the tips of the teeth 182A and 182B bite into the formed thread groove, the contact area between the tips of the teeth 182A and 182B and the external lead wire 10B increases, and oxidation of the contact portions can be prevented. , Reliability of electrical connectivity will be improved,
Even if the power supply terminal 160 (FIG. 13) according to the sixth embodiment is to be extracted from the cold cathode fluorescent lamp 2, it is difficult to extract the tongue pieces 162A, 162B, 162C because they are biting into the external lead wire 10B. It is. However, since the power supply terminal 180 according to the seventh embodiment can be removed simply by rotating it in the direction opposite to the arrow C in FIG. 14C, it can be reused.
<Eighth embodiment>
FIG. 15 is a perspective view showing a schematic configuration of a direct-type backlight unit 300 having the cold cathode fluorescent lamp 4 as a light source. FIG. 15 is a diagram in which a diffusing plate 308, a diffusing sheet 310, and a lens sheet 312 described later are broken.

  The backlight unit 300 includes an envelope 306 including a rectangular reflecting plate 302 and a side plate 304 surrounding the reflecting plate 302. The reflecting plate 302 and the side plate 304 are both reflecting films (not shown) in which aluminum or the like is vapor-deposited on one main surface (the inner surface when assembled as the envelope 306) of a plate material made of PET (polyethylene terephthalate) resin. Is formed.

  In the envelope 306, a plurality of (8 in this example) cold cathode fluorescent lamps 4 are housed as light sources at regular intervals in the short side direction in parallel with the long side of the reflector 302.

  In addition, a diffusion plate 308, a diffusion sheet 310, and a lens sheet 312 are provided in the opening of the envelope 306.

  A structure for attaching the cold cathode fluorescent lamp 4 to the envelope 306 in the backlight unit 300 will be described with reference to FIG. In the illustrated example, the power supply terminal 2 according to the first embodiment is used, but any of the power supply terminals of other embodiments 2 to 5 including the modification may be used.

On the upper surface of the reflecting plate 302, a connector 314 is formed which is made of, for example, phosphor bronze and is formed by bending a metal plate having spring properties. The cold cathode fluorescent lamp 4 can be attached to the envelope 306 with one touch by fitting the main body portion 16 of the power supply terminal 2 attached to both ends thereof into the corresponding connector 314. As a result, the power supply terminal 2 and the connector 314 are electrically connected, and power from a lighting circuit (not shown) is input to the cold cathode fluorescent lamp 4 through the connector 314 and the power supply terminal 2.
<Problems and solutions for attaching a cold cathode fluorescent lamp equipped with a power supply terminal to a backlight unit>
(1) Since the cold cathode fluorescent lamp 4 is mounted simply by inserting the main body 16 of the power supply terminal 2 from the opening of the connector 314, the cold cathode fluorescent lamp 4 may be displaced in the tube axis direction. is there. For example, in the case of a cold cathode fluorescent lamp provided with a glass container having an elliptical cross section, the mounting direction around the tube axis becomes a problem. In the case of an elliptical cross section, in order to efficiently extract light from the backlight unit, it is preferable that the major axis or minor axis is parallel to the reflecting plate 302. This is because the take-out efficiency is reduced.

  FIGS. 17 and 18 are views showing the power supply terminal 120 and the connector 130 that are configured to prevent displacement in the tube axis direction and around the tube axis when the cold cathode fluorescent lamp 4 is attached to the connector. In addition, in the power supply terminal 120, the same code | symbol is attached | subjected about the component substantially the same as the power supply terminal 2 (FIG. 2, FIG. 3) which concerns on Embodiment 1, and the description is abbreviate | omitted.

  An engagement hole 124 is formed in the cylindrical wall of the main body 122 of the power supply terminal 110.

  The connector 130 has basically the same configuration as the connector 214 described above. That is, the connector 130 is formed by pressing a long and narrow plate material (phosphor bronze plate) made of phosphor bronze, and includes a pair of sandwiching pieces 130A and 130B that have arc portions and are opposed to each other, and a connecting portion 130C that connects the two. Has been. An engagement protrusion 130D that protrudes inward is provided in the arc-shaped portion of one sandwiching piece 130A. Note that the height of the engagement protrusion 130D from the inner surface of the arc-shaped portion is desirably the same as the thickness of the cylindrical wall of the main body portion 122 of the power supply terminal 124.

  In the power supply terminal 120 and the connector 130 having the above-described configuration, when the power supply terminal 120 is fitted into the connector 130 such that the engagement hole 124 is engaged with the engagement protrusion 130D, the cold cathode fluorescent lamp 4 is attached to the connector 130. It is possible to prevent displacement in the tube axis direction and around the tube axis.

  (2) Since the outer periphery of the main body of the power supply terminal described so far is a cylindrical surface as a whole, when the cold cathode fluorescent lamp equipped with this is arranged on a flat work table to be attached to the backlight unit, There may be a problem that it is easy to roll on the workbench and difficult to handle.

  FIG. 19 is a diagram showing a power supply terminal 140 that has a structure that does not easily roll even when placed on a flat surface. In FIG. 19, the same components as those of the power supply terminal 120 (FIGS. 17 and 18) described above are denoted by the same reference numerals, and description thereof is omitted.

  In the power supply terminal 140, a part of the outer peripheral surface of the main body 142 is a flat surface 144. Thus, by providing the main surface 142 with the flat surface 144, the cold cathode fluorescent lamp equipped with the flat surface 144 is less likely to roll on the flat surface. In this case, the mounting angle (angle around the tube axis) of both power supply terminals 140 is adjusted so that both flat surfaces 144 of the power supply terminals 140 provided at both ends of the cold cathode fluorescent lamp 4 are located on the same plane. It is preferable to keep it.

  The lower part of FIG. 19 shows a preferable structure of the connector 150 when the power supply terminal 140 configured as described above is employed. In FIG. 19, the same components as those of the power supply terminal 130 (FIGS. 17 and 18) described above are denoted by the same reference numerals, and description thereof is omitted.

  One clamping piece 152 in the connector 150 is provided with a flat portion 152A that matches the flat surface 144 of the power supply terminal 140. As shown in FIG. 20, if the power supply terminal 140 is fitted into the connector 130 so that the flat surface 144 engages with the flat portion 152 </ b> A, the cold cathode fluorescent lamp 4 is shifted around the tube axis with respect to the connector 130. Can be prevented.

  (3) Feeding terminal 2 according to Embodiment 1 (FIG. 3), feeding terminal according to Embodiment 2 (FIG. 8), feeding terminal according to Embodiment 3 (FIG. 9), feeding according to Embodiment 4 In the terminal 80 (FIG. 10) and the power supply terminal 110 (FIGS. 11 and 12) according to the fifth embodiment, the elastic pinching portion (for example, the elastic pinching portion 18 in the power supply terminal 2 of the first embodiment) is the main body portion. 16, the glass container 6 that supports the lead wire 10 due to the projecting portion colliding with a work table or other cold-cathode fluorescent lamps during handling such as attachment to the backlight unit. There is a risk that parts will be damaged.

  FIG. 21 is a diagram illustrating a power supply terminal 190 configured to cope with such a problem. In addition, in the power supply terminal 190, the same code | symbol is attached | subjected about the component substantially the same as the power supply terminal 2 (FIG. 2, FIG. 3) which concerns on Embodiment 1, and the description is abbreviate | omitted.

  The power supply terminal 190 has a configuration in which protective portions 192 and 194 that surround the external lead wire 10B from a direction orthogonal to the tube axis extend between the elastic pieces 22 and 24 at the end of the main body portion 16.

  Thus, by providing the protection portions 192 and 194 surrounding the external lead wire 10B, the external lead wire 10B can be protected from external force as much as possible.

  In the above example, the protection portions 192 and 194 are extended from the main body portion 16. However, the protection portions 192 and 194 are separated from the main body portion 16, and are attached to the main body portion 16 so as to be integrated with the main body portion 16. It does not matter if they are joined. FIG. 22 shows a power supply terminal 196 configured as such.

  In the power supply terminal 196 as well, the same components as those of the power supply terminal 2 (FIGS. 2 and 3) according to Embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.

  The power supply terminal 196 is configured by adding a protective member 198 to the structure of the power supply terminal 2 of the first embodiment.

  The protection member 198 has a cylindrical shape, and is joined to the main body portion 16 by laser welding or the like after one end portion is extrapolated to the main body portion 16. Thus, by providing the protective member 198 surrounding the external lead wire 10B, the external lead wire 10B can be protected from external force as much as possible.

  Furthermore, the following configuration can prevent the cold cathode fluorescent lamp 4 from being displaced around the tube axis with respect to the connector.

  At one end of the protective member 198, notches 198A and 198B as shown in the illustrated example are provided.

  On the other hand, the connector 200 is provided with engagement protrusions 130E and 130F that engage with the notches 198A and 198B when the power supply terminal 196 is fitted. In the socket 200 shown in FIG. 22, the same reference numerals are given to the same components as those of the socket 130 shown in FIG. 17, and the description thereof is omitted.

  The engagement protrusions 130E and 130F are provided at end portions of an extending portion 130D that extends from the connecting portion 130C in the tube axis direction.

An engagement hole (not shown) may be used instead of the notches 198A and 198B. Further, the engagement protrusions 130E and 130F may be provided separately from the connector. Furthermore, the number of the notches 198A and 198B and the engagement holes is not limited to two and may be one. Or three or more may be sufficient. The number of engaging protrusions may be changed as appropriate according to the number of notches and engaging holes.
<Embodiment 9>
FIG. 23 shows an outline of a liquid crystal display device 320 according to the ninth embodiment. The liquid crystal display device 320 is, for example, a 32 [inch] liquid crystal television and, as shown in FIG. 23, lights up with a liquid crystal screen unit 322 including a liquid crystal panel and the like, and a backlight unit 300 arranged on the back of the liquid crystal screen unit 322. A circuit 324.

  The liquid crystal screen unit 322 is a publicly known one and includes a liquid crystal panel (color filter substrate, liquid crystal, TFT substrate, etc.) (not shown), a drive module, etc. (not shown), and is based on an image signal from the outside. To form a color image.

  The lighting circuit 324 lights the cold cathode fluorescent lamp 4 (FIGS. 15 and 16) inside the backlight unit 300. The cold cathode fluorescent lamp 4 is operated at a lighting frequency of 40 [kHz] to 100 [kHz] and a lamp current of 4 [mA] to 18 [mA].

As described above, the present invention has been described based on the embodiment. However, the present invention is not limited to the above-described form, and for example, the following form may be adopted.
(1) In the above embodiment, a cold cathode fluorescent lamp has been described as an example of a cold cathode discharge lamp. However, the present invention is not limited to a fluorescent lamp and can be applied to a cold cathode ultraviolet lamp. That is, the phosphor film may be removed from the configuration of the cold cathode fluorescent lamp according to the above-described embodiment (the phosphor film is not formed) and applied to a configuration configured as a cold cathode ultraviolet lamp. The ultraviolet lamp irradiates an irradiated object with ultraviolet rays and is used for sterilization of the irradiated object.
(2) In the above embodiment, the electrical connection with the lead wire (external lead wire) is achieved only by the elastic restoring force of the elastic clamping portion in the power supply terminal, but in order to ensure more reliable connectivity, the lead The wire (external lead wire) and the contact portion may be joined by laser welding, resistance welding, arc welding, or the like.
(3) In the first to fifth embodiments (FIGS. 1 to 12), the power supply terminal in which the main body portion and the elastic clamping portion are integrated by pressing one metal plate is manufactured. The main body portion and the elastic pinching portion may be manufactured separately, and then the main body portion and the elastic pinching portion may be joined together to be integrated.
(4) glass used in a glass container for a glass container, in terms of oxide, SiO ₂ is 60 [wt%] ~75 [wt ]%, Al 2 O 3 is 1 [wt%] ~5 [wt %], Li ₂ O is 0 [wt%] to 5 [wt%], K ₂ O is 3 [wt%] to 11 [wt%], Na ₂ O is 3 [wt%] to 12 [wt%], and CaO is 0 [wt%] to 9 [wt%], MgO from 0 [wt%] to 9 [wt%], SrO from 0 [wt%] to 12 [wt%], BaO from 0 [wt%] to 12 [wt%] wt%]. In this case, it is possible to provide an environment-friendly cold cathode fluorescent lamp that does not contain a lead component. Furthermore, glass used in the glass container, in terms of oxide, SiO ₂ is 60 [wt%] ~75 [wt ]%, Al 2 O 3 is 1 [wt%] ~5 [wt %], B 2 O ₃ 0 [wt%] ~3 [wt %], Li 2 O is 0 [wt%] ~5 [wt %], K 2 O is 3 [wt%] ~11 [wt %], Na 2 O is 3 [wt%] to 12 [wt%], CaO from 0 [wt%] to 9 [wt%], MgO from 0 [wt%] to 9 [wt%], and SrO from 0 [wt%] to 12 [wt%] wt%] and BaO more preferably have a composition of 0 [wt%] to 12 [wt%].

The glass used for the glass container, in terms of oxide, SiO ₂ is 60 [wt%] ~75 [wt ]%, Al 2 O 3 is 1 [wt%] ~5 [wt %], Li 2 O is 0.5 [wt%] to 5 [wt%], K ₂ O 3 [wt%] to 7 [wt%], Na ₂ O 5 [wt%] to 12 [wt%], and CaO 1 [ wt%]-7 [wt%], MgO 1 [wt%]-7 [wt%], SrO 0 [wt%]-5 [wt%], BaO 7 [wt%]-12 [wt%] It may have the composition of]. In this case, it is possible to provide an environment-friendly cold cathode fluorescent lamp that is easy to process into a lamp and does not contain a lead component.

Further, glass for use in glass containers, in terms of oxide, SiO ₂ is 65 [wt%] ~75 [wt ]%, Al 2 O 3 is 1 [wt%] ~5 [wt %], B 2 O 3 There 0 [wt%] ~3 [wt %], Li 2 O is 0.5 [wt%] ~5 [wt %], K 2 O is 3 [wt%] ~7 [wt %], Na 2 O Is 5 [wt%] to 12 [wt%], CaO is 2 [wt%] to 7 [wt%], MgO is 2.1 [wt%] to 7 [wt%], and SrO is 0 [wt%]. -0.9 [wt%], BaO may have a composition of 7.1 [wt%] to 12 [wt%]. In this case, it does not contain a lead component, has an electrical insulating property suitable for lighting applications, and can prevent devitrification. Furthermore, the glass used for the glass container is, in terms of oxide, SiO ₂ 65 [wt%] to 75 [wt]%, Al ₂ O ₃ 1 [wt%] to 3 [wt%], B ₂ O. ₃ 0 [wt%] ~3 [wt %], Li 2 O is 1 [wt%] ~3 [wt %], K 2 O is 3 [wt%] ~6 [wt %], Na 2 O is 7 [wt%] to 10 [wt%], CaO from 3 [wt%] to 6 [wt%], MgO from 3 [wt%] to 6 [wt%], and SrO from 0 [wt%] to 0. It is more preferable that 9 [wt%] and BaO have a composition of 7.1 to 10 [wt%].
(5) Phosphor of phosphor layer (5-1) UV absorption For example, recently, with the increase in size of liquid crystal color televisions, polycarbonate with good dimensional stability is used for the diffusion plate that closes the opening of the backlight unit. It has come to be. This polycarbonate is easily deteriorated by ultraviolet rays having a wavelength of 313 [nm] emitted from mercury. In such a case, a phosphor that absorbs ultraviolet light having a wavelength of 313 [nm] may be used. The following phosphors absorb 313 [nm] ultraviolet rays.

(A) Blue Europium / manganese co-activated barium aluminate / strontium / magnesium [Ba _1-xy Sr _x Eu _y Mg _1-z Mn _z Al ₁₀ O ₁₇ ] or [Ba _1-xy Sr _x Eu _y Mg _{2− z} Mn _z Al ₁₆ O ₂₇ ]
Here, x, y, and z are preferably numbers satisfying the conditions of 0 ≦ x ≦ 0.4, 0.07 ≦ y ≦ 0.25, and 0 ≦ z <0.1, respectively.

Examples of such phosphors include europium activated barium magnesium aluminate [BaMg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ ], [BaMgAl ₁₀ O ₁₇ : Eu ²⁺ ] (abbreviation: BAM-B), Europium activated barium aluminate / strontium / magnesium [(Ba, Sr) Mg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ ], [(Ba, Sr) MgAl ₁₀ O ₁₇ : Eu ²⁺ ] (abbreviation: SBAM-B) Etc.

(B) Green • Manganese inactive magnesium gallate [MgGa ₂ O ₄ : Mn ²⁺ ] (abbreviation: MGM)
Manganese activated cerium aluminate, magnesium, zinc [Ce (Mg, Zn) Al ₁₁ O ₁₉ : Mn ²⁺ ] (abbreviation: CMZ)
· Active aluminate, cerium-magnesium with terbium ^{_{[CeMgAl 11 O 19: Tb 3+}} ] ( abbreviation: CAT)
• Europium • Manganese co-activated barium aluminate • Strontium • Magnesium [Ba _{1 -xy} Sr _x Eu _y Mg _{1 -z} Mn _z Al ₁₀ O ₁₇ ] or [Ba _{1 -xy} Sr _x Eu _y Mg _{2 -z} Mn _z Al ₁₆ O ₂₇ ]
Here, x, y and z are numbers satisfying the conditions of 0 ≦ x ≦ 0.4, 0.07 ≦ y ≦ 0.25, and 0.1 ≦ z ≦ 0.6, respectively, and z is 0.4 It is preferable that ≦ x ≦ 0.5.

Examples of such phosphors include europium / manganese co-activated barium aluminate / magnesium [BaMg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ , Mn ²⁺ ], [BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , Mn ^{2]. +} ] (Abbreviation: BAM-G), europium / manganese co-activated barium aluminate / strontium / magnesium [(Ba, Sr) Mg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ , Mn ²⁺ ], [(Ba, Sr) MgAl ₁₀ O ₁₇ : Eu ²⁺ , Mn ²⁺ ] (abbreviation: SBAM-G).

(C) Red • Europium activated phosphorus • Yttrium vanadate [Y (P, V) O ₄ : Eu ³⁺ ] (abbreviation: YPV)
Europium activated yttrium vanadate [YVO ₄ : Eu ³⁺ ] (abbreviation: YVO)
・ Europium-activated yttrium oxysulfide [Y ₂ O ₂ S: Eu ³⁺ ] (abbreviation: YOS)
Manganese-activated magnesium fluorinated germanate [3.5MgO / 0.5MgF ₂ / GeO ₂ : Mn ⁴⁺ ] (abbreviation: MFG)
Dysprosium-activated yttrium vanadate [YVO ₄ : Dy ³⁺ ] (red and green two-component phosphor, abbreviation: YDS)
In addition, you may mix and use the fluorescent substance of a different compound with respect to one type of luminescent color. For example, only BAM-B (absorbs 313 [nm]) in blue, LAP (does not absorb 313 [nm]) in green, BAM-G (absorbs 313 [nm]) in green, and YOX in red Alternatively, a phosphor of YVO (absorbs 313 [nm]) may be used. In such a case, as described above, the phosphor that absorbs the wavelength 313 [nm] is adjusted so that the total weight composition ratio is larger than 50%, so that the ultraviolet rays almost leak out of the glass bulb. Can be prevented. Therefore, when the phosphor layer 105 includes a phosphor that absorbs ultraviolet rays of 313 [nm], deterioration due to ultraviolet rays such as a diffusion plate made of polycarbonate (PC) that closes the opening of the backlight unit is suppressed, The characteristics as a backlight unit can be maintained for a long time.

Here, “absorbing ultraviolet rays of 313 [nm]” means an excitation wavelength spectrum near 254 [nm] (excitation wavelength spectrum means excitation light emission while changing the wavelength of the phosphor, and the excitation wavelength and emission intensity are changed. The intensity of the excitation wavelength spectrum at 313 [nm] is defined as 80 [%] or more. That is, the phosphor that absorbs ultraviolet rays of 313 [nm] is a phosphor that can absorb ultraviolet rays of 313 [nm] and convert it into visible light.
(5-2) High color reproduction Liquid crystal display devices typified by liquid crystal color televisions are used as a light source for a backlight unit of the liquid crystal display device in accordance with the recent high color reproduction performed as part of the improvement in image quality. There is a need to expand the reproducible chromaticity range in the cold cathode discharge lamp and the external electrode discharge lamp.

  In response to such a request, for example, by using the following phosphor, the chromaticity range can be expanded as compared with the case of using the phosphor in the embodiment. Specifically, in the CIE1931 chromaticity diagram, the chromaticity coordinate value of the phosphor for high color reproduction includes a triangle formed by connecting the chromaticity coordinate values of the three phosphors used in the embodiment. Located at the coordinates that expand the reproduction range.

(A) Blue • Europium-activated strontium chloroapatite [Sr ₁₀ (PO ₄ ) ₆ Cl ₂ : Eu ²⁺ ] (abbreviation: SCA), chromaticity coordinates: x = 0.151, y = 0.065
In addition to the above, europium activated strontium, calcium, barium, chloroapatite [(Sr, Ca, Ba) ₁₀ (PO ₄ ) ₆ Cl ₂ : Eu ²⁺ ] (abbreviation: SBCA) can also be used, and the wavelength 313 (nm) SBAM-B, which can absorb ultraviolet rays), can also be used for high color reproduction.

(B) Green BAM-G, chromaticity coordinates: x = 0.139, y = 0.574
CMZ, chromaticity coordinates: x = 0.164, y = 0.722
CAT, chromaticity coordinates: x = 0.267, y = 0.663
As described above, these can also absorb ultraviolet rays having a wavelength of 313 [nm], and in addition to the three phosphor particles described here, MGM can also be used for high color reproduction.

(C) Red • YOS, chromaticity coordinates: x = 0.651, y = 0.344
YPV, chromaticity coordinates: x = 0.658, y = 0.333
MFG, chromaticity coordinates: x = 0.711, y = 0.287
As described above, these can also absorb ultraviolet rays having a wavelength of 313 [nm], and besides the three phosphor particles described here, YVO and YDS can also be used for high color reproduction.

  In addition, the chromaticity coordinate values shown above are representative values measured only with each phosphor powder, and due to the measurement method (measurement principle), etc., the chromaticity coordinates indicated by each phosphor powder The value may be slightly different from the value listed above. For reference, the chromaticity coordinate values of the phosphor powders of the first embodiment are YOX (x = 0.644, y = 0.353), LAP (x = 0.351, y = 0.585). , BAM-B (x = 0.148, y = 0,056).

  Furthermore, the phosphor used for emitting each color of red, green, and blue is not limited to one type for each wavelength, and a plurality of types may be used in combination.

  Here, the case where a phosphor layer is formed using the above-described phosphor particles for high color reproduction will be described. In this evaluation, there are three evaluations in the case of using a phosphor for high color reproduction based on the area of the NTSC triangle (NTSC triangle) connecting the chromaticity coordinate values of the three primary colors of the NTSC standard in the CIE1931 chromaticity diagram. This is performed by the ratio of the area of triangles that can connect chromaticity coordinate values (hereinafter referred to as NTSC ratio).

  For example, when BAM-B is used as blue, BAM-G as green, and YVO as red (Example 1), the NTSC ratio is 92%, and SCA is used as blue, BAM-G as green, and YVO as red. (Example 2) When NTSC ratio is 100%, SCA is used as blue, BAM-G is used as green, and YOX is used as red (Example 3), NTSC ratio is 95%. The luminance can be improved by 10 [%] as compared with the above.

  Note that the chromaticity coordinate values used in the evaluation here are measured in a state where a liquid crystal display device incorporating a lamp or the like is used, so that the color reproduction range varies from the above value depending on the combination with the color filter. there is a possibility.

  The power supply terminal according to the present invention can be suitably used as, for example, a power supply terminal attached to an end of a cold cathode fluorescent lamp used as a light source of a backlight unit constituting a liquid crystal display device.

  The present invention relates to a power supply terminal and the like, and more particularly to a power supply terminal for attaching a cold cathode discharge lamp to, for example, a connector of a backlight unit.

  A cold cathode fluorescent lamp, which is a kind of cold cathode discharge lamp, is suitable for reducing the diameter, and is therefore suitably used as a light source for a backlight unit that is required to be thin (downsized). To facilitate the attachment of the cold cathode fluorescent lamp to the backlight unit and the electrical connection between the lead wires at both ends of the cold cathode fluorescent lamp and the lighting power supply, power supply terminals are provided at both ends of the cold cathode fluorescent lamp. It is done.

The power supply terminal includes a cylindrical main body portion and a lead wire connecting portion extending from the main body portion. The main body is extrapolated to the end of a hermetically sealed glass tube in the cold cathode fluorescent lamp, and the lead wire connecting portion is electrically connected to the lead wire.
When the power supply terminal having the above configuration is used, the cold cathode fluorescent lamp can be attached to the backlight unit with one touch by fitting the main body of the power supply terminal into the connector provided in the backlight unit. Power can be supplied from the lighting power source via the power supply terminal.

Here, it goes without saying that the lead wire connecting portion in the power supply terminal is an important part for reliably supplying power from the lighting power source to the cold cathode fluorescent lamp, and various structures have been proposed heretofore.
For example, in Patent Document 1, an end portion of a strip-shaped connection piece extending in the tube axis direction of the glass tube from a main body portion is folded at a right angle, and a lead wire insertion hole is provided in the folded portion. It is disclosed. Then, in a state where the lead wire is inserted into the insertion hole, solder is poured so as to fill a gap between the lead wire and the insertion hole, and the two are electrically connected.

  By doing in this way, a lead wire and a connection piece will be electrically connected reliably via solder.

JP 2007-234551 A

However, although solder has a function as a joining member, its mechanical strength is generally low. Therefore, for example, when an external force is applied to the main body in the tube axis direction, the solder may be peeled off from one member, or the solder itself may be broken, and the conduction between the lead wire and the connection piece cannot be obtained. It can happen.
In order to cope with this problem, it is conceivable that the tip of the connecting piece is formed in an appropriate shape and the tip is caulked to the lead wire. (A radial force) is applied, and a crack (damage) is expected to occur in the glass tube portion holding the lead wire.

  The present invention has been made in view of the above-described problems, and assures electrical connection with the lead wire as much as possible, and prevents damage to the glass tube when it is provided in a cold cathode discharge lamp. It is an object of the present invention to provide a power supply terminal that can be used, a cold cathode discharge lamp having the power supply terminal, and the like.

  In order to achieve the above object, a power supply terminal according to the present invention is a cold glass having a tubular glass container and a lead wire sealed to the end of the glass container and extended outward in the tube axis direction. A power supply terminal attached to an end portion of the cathode discharge lamp, and a body portion externally attached to an outer periphery of the end portion of the glass container, and an elastic restoring force provided in the body portion and the lead wire being inserted And an elastic clamping part for clamping the lead wire.

Further, the elastic clamping portion includes at least two elastic piece portions extending from the main body portion, and an abutting portion provided at each distal end portion of the elastic piece portion and in contact with the outer periphery of the lead wire. Thus, in a state before the lead wire is inserted, a contact portion with the lead wire in the contact portion exists radially inside the virtual outer peripheral surface of the lead wire.
Alternatively, the main body portion has a cylindrical shape, and the elastic pinching portion extends from the main body portion and has at least two slits opened in the tube axis direction, and the conical body And a contact portion that contacts the outer peripheral surface of the lead wire, a taper screw is provided on a part of the outer surface of the cone portion, and the power supply terminal further includes the taper It has a ring nut screwed with a screw.

In addition, the contact portion of the contact portion is formed in a shape suitable for the outer peripheral surface of the lead wire, and is in surface contact with the outer periphery of the lead wire.
Furthermore, in the state where the lead wire is inserted into the elastic clamping portion, the contact portion presses the lead wire with a pressing force of at least 100 [gf] by the elastic restoring force.

  In order to achieve the above object, a cold cathode discharge lamp according to the present invention comprises a tubular glass container and a lead wire sealed to the end of the glass container and extended outward in the tube axis direction. A cold-cathode discharge lamp with a power supply terminal having a power supply terminal attached to an end of the glass container, wherein the power supply terminal is the above-described power supply terminal, and the main body is an end of the glass container The lead wire is inserted in the outer periphery and the lead wire is inserted in the elastic clamping part.

In order to achieve the above object, a backlight unit according to the present invention includes the cold cathode discharge lamp with a feeding terminal as a light source.
In order to achieve the above object, a liquid crystal display device according to the present invention includes a liquid crystal display panel and the backlight unit disposed on the back surface of the liquid crystal display panel.

According to the power supply terminal having the above-described configuration, the elastic pinching portion is electrically connected by pinching the lead wire with an elastic restoring force in a state where the lead wire is inserted. Therefore, the above-described problem caused by the presence of solder or the like for electrical connection between the two is unlikely to occur. Therefore, electrical connection can be reliably performed.
Further, since the lead wire can be clamped by the elastic clamping portion by insertion, an excessive force is not easily applied to the lead wire when the power supply terminal is attached to the cold cathode discharge lamp. Therefore, the glass tube can be prevented from being damaged when it is provided in the cold cathode discharge lamp.

1 is a partially cutaway perspective view of a cold cathode fluorescent lamp including a power supply terminal according to Embodiment 1. FIG. It is the longitudinal cross-sectional view of the one end part part of the said cold cathode fluorescent lamp, and a right view. It is a figure which shows the power feeding terminal of Embodiment 1, (a) is a perspective view of the power feeding terminal before mounting | wearing with a glass container, (b) is a perspective view of the power feeding terminal after mounting | wearing, (c) is a clip part. diagram for explaining a clearance S _1, S ₂ of the free end portion and the portion other than the clip portion of the main body portion of, (d) the width of the gap portion between the outer surface of the inner surface and the glass container body portion it is a diagram for explaining the S _3. 6 is a diagram showing a power supply terminal according to a modification of the first embodiment. FIG. It is a figure which shows the example which provided the stopper in the said electric power feeding terminal, and has shown the contact part of the said electric power feeding terminal and a part of elastic piece part corresponding to this, (a) is a front view, (b) (A) is a cross-sectional view AA, (c) is a right side view. (A), (b) is a figure which shows the modification of the said electric power feeding terminal. (A), (b) and (c), (d) are the figures which show the modification of the said electric power feeding terminal, respectively. 6 is a diagram showing a power supply terminal according to Embodiment 2. FIG. 6 is a diagram illustrating a power supply terminal according to Embodiment 3. FIG. It is the front view and right view of the one end part part of the cold cathode fluorescent lamp with which the electric power feeding terminal which concerns on Embodiment 4 was mounted | worn. FIG. 10 is a diagram illustrating a power supply terminal according to a fifth embodiment. It is a figure which shows before and after mounting | wearing with the cold cathode fluorescent lamp of the electric power feeding terminal which concerns on Embodiment 5. FIG. FIG. 10 is a diagram illustrating a power supply terminal according to a sixth embodiment. FIG. 10 is a diagram illustrating a power supply terminal according to a seventh embodiment. It is a figure which shows the backlight unit which concerns on embodiment. It is a figure which shows the attachment structure to the envelope of the cold cathode fluorescent lamp in the said backlight unit. It is a figure which shows an example of an electric power feeding terminal and a connector. It is a figure which shows a cross section in the state in which the electric power feeding terminal shown in FIG. 17 was inserted in the connector. It is a figure which shows an example of an electric power feeding terminal and a connector. It is a figure which shows a cross section in the state in which the electric power feeding terminal shown in FIG. 19 was inserted in the connector. It is a figure which shows an example of an electric power feeding terminal. It is a figure which shows an example of an electric power feeding terminal and a connector. It is a partially cutaway perspective view showing a liquid crystal display device according to an embodiment.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
<Embodiment 1>
FIG. 1 is a partially cutaway perspective view showing a schematic configuration of a power supply terminal 2 according to the first embodiment and a cold cathode fluorescent lamp 4 in which the power supply terminal 2 is provided at both ends thereof. FIG. FIG. In addition, the scale between each structural member is not unified in all the figures including FIG. 1, FIG.

  The cold cathode fluorescent lamp 4 has a glass container 6 having a circular cross section. The glass container 6 is a container that is hermetically sealed with lead wires 10 to be described later sealed at both ends of the glass tube. The glass container 6 is not limited to a straight tube shape as shown in the figure, but may be a bent shape such as a U-shaped tube, a U-shaped tube, an S-shaped tube, a W-shaped tube, or a spiral tube. I do not care. Further, the cross section of the glass container (glass tube) is not limited to a circular shape, and may be a flat shape such as an ellipse.

The glass container 6 is made of borosilicate glass for sealing a tungsten wire. As an example of the dimensions, the total length is 730 [mm], the outer diameter is 4 [mm], and the inner diameter is 3 [mm]. The material of the glass container 6 is not limited to borosilicate glass, but may be lead glass, lead-free glass, soda lime glass, or other soft glass.
Inside the glass container 6, a mixed gas of about 1200 [μg] mercury (not shown) and about 8 [kPa] (20 [° C.]) neon and argon as a rare gas is Ne: 95 [mol%]. ], Ar: 5 [mol%] is enclosed. Note that the rare gas may contain krypton. In this case, infrared radiation of the cold cathode discharge lamp can be suppressed. Furthermore, it is preferable that krypton is contained in the rare gas within a range of 0.5 [mol%] to 5 [mol%]. In this case, infrared radiation of the cold cathode discharge lamp can be suppressed without greatly changing the lamp voltage. For example, for example, argon is in the range of 0 [mol%] to 9.5 [mol%], neon is in the range of 90 [mol%] to 95.5 [mol%], and krypton is 0.5 [mol%]. %] Or more and 5 [mol%] or less. Furthermore, it is more preferable that krypton is contained in the rare gas within a range of 0.5 [mol%] to 3 [mol%]. Furthermore, it is even more preferable that krypton is contained in the rare gas in the range of 1 [mol%] to 3 [mol%].

A phosphor film 8 is formed on the inner surface of the glass container 6. The phosphor film 8 includes three kinds of rare earth phosphors of blue (B), green (G), and red (R), and emits white light as a whole. In this example, europium activated barium magnesium aluminate [BaMg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ ] (abbreviation: BAM-B) is used for the blue phosphor, and cerium terbium co-activated lanthanum phosphate [LaPO is used for the green phosphor. ₄ : Ce ³⁺ , Tb ³⁺ ] (abbreviation: LAP), and europium activated yttrium oxide [Y ₂ O ₃ : Eu ³⁺ ] (abbreviation: YOX) is used for the red phosphor.

  The lead wire 10 is a connection between an internal lead wire 10A made of tungsten and an external lead wire 10B made of nickel. The lead wire 10 has an inner lead wire 10A portion sealed at the end of the glass container 6, and the outer lead wire 10B extends outward from the sealed portion in the tube axis direction. Both the internal lead wire 10A and the external lead wire 10B have a circular cross section. For example, the inner lead wire 10A has a wire diameter of 0.8 [mm] and a total length of 3 [mm], and the outer lead wire 10B has a wire diameter of 0.6 [mm] and a total length of 4 [mm]. When glass container 6 is borosilicate glass for sealing Kovar wire, internal lead wire 10A is preferably made of an alloy of iron, nickel, and cobalt (Kovar) or molybdenum. When the glass container 6 is lead-free glass or soda glass, the internal lead wire 10A is preferably made of an alloy of iron and nickel or a jumet wire.

  An electrode 12 is joined by laser welding or the like to the inner end of the inner lead wire 10A sealed to the end of the glass container 6 on the inner side of the glass container 6. The electrode 12 is a so-called hollow electrode having a bottomed cylindrical shape, and is obtained by processing a niobium rod. The reason why the hollow electrode is used as the electrode 12 is that it is effective for suppressing sputtering in the electrode caused by the discharge during lamp lighting (for details, see Japanese Patent Application Laid-Open No. 2002-289138). The material used for the electrode 12 is not limited to niobium, and may be nickel, tantalum, molybdenum, tungsten, or the like. The electrode 12 and the internal lead wire 10A may be welded via a brazing material made of nickel foil or Kovar foil, for example.

An electron emissive material layer (not shown) may be formed on the surface of the electrode 12. In this case, the lamp voltage can be lowered compared to a lamp not provided with an electron emissive material layer. Since the power supply terminal 2 described later is provided, the heat generated in the electrode 12 can be easily dissipated through the power supply terminal 2, thereby suppressing an excessive increase in the temperature around the electrode 12, and the electrode 12. By suppressing mercury from being reduced in the vicinity, sputtering of the electron-emitting material layer can be suppressed, and the effect of reducing the lamp voltage can be maintained compared to a lamp in which the power supply terminal 2 is not provided.
Specifically, the electron emissive material layer is formed, for example, on the inner surface of the electrode. The electron emissive material layer includes, for example, a rare earth element. This is because the cold cathode discharge lamp is effective for lowering the lamp voltage. Furthermore, the rare earth element is more preferably one or more of lanthanum (La) and yttrium (Y).

The electron-emitting material layer may be any one of silicon (Si), aluminum (Al), zirconium (Zr), boron (B), zinc (Zn), bismuth (Bi), phosphorus (P), and tin (Sn). It is preferable that 1 or more types are included. In this case, the lamp voltage reduction effect can be further sustained.
Furthermore, a cesium (Cs) compound may be included in the electron-emitting material layer. In this case, the dark start characteristics of the lamp can be further improved. In addition to the electron-emitting material layer, a cesium compound may be attached to the inner surface or outer surface of the electrode 12.

As the cesium compound, for example, it is preferable to use at least one of cesium sulfate, cesium aluminate, cesium niobate, cesium tungstate, cesium molybdate, and cesium chloride.
A feeding terminal 2 is attached to the end of the glass container 6.
3A is a perspective view of the power supply terminal 2 before being attached to the glass container 6, FIG. 3B is a perspective view of the power supply terminal 2 after being attached, and FIG. FIG. 3D is a diagram for explaining the gaps S ₁ and S ₂ between the free end portion and the portion other than the clip portion 20 of the main body portion 16. FIG. It shows a diagram for explaining a width S ₃ of the gap portion between each.

  The power supply terminal 2 includes a main body portion 16 that is externally attached to the outer periphery of the end portion of the glass container 6, and an elastic clamping portion 18 that extends from the main body portion 16 and clamps the lead wire 10 (external lead wire 10 </ b> B). The power supply terminal 2 is obtained by pressing (sheet metal processing) a metal plate such as stainless steel. In addition, when using stainless steel, SUS304 is preferable from a viewpoint of corrosion resistance and spring property. Moreover, you may use not only stainless steel but other metal materials, such as phosphor bronze, spring steel, and beryllium steel.

  The main body 16 has a cylindrical shape. Clip portions 20 are formed on the cylindrical wall of the main body portion 16 at three locations at equal intervals in the circumferential direction. Each of the clip portions 20 is formed of a tongue piece formed by a substantially U-shaped cut inserted in the longitudinal direction with respect to the cylindrical wall. The free end portion of the tongue piece separated from the main body portion is bent in a “<” shape toward the inside as shown in the figure, and starts from the base end portion connected to the main body portion 16. The whole is bent inward (plastically deformed). When the main body portion 16 having the above configuration is extrapolated to the outer periphery of the end portion of the glass container 6, the top of the “<” shape of the free end portion abuts the outer periphery of the glass container 6, and the entire clip portion 20 The glass container 6 is elastically bent (elastically deformed) outwardly in the radial direction of the glass container 6 with the base end as a base point, and the glass container 6 is held by the restoring force. Thereby, the glass container 6 is positioned in the main body portion 16 in a state where the cylindrical main body portion 16 and the substantially axial center coincide with each other.

Needless to say, the shape, number, arrangement position, and the like of the clip portion 20 are not limited to those described above. In short, any configuration that can elastically support the glass container 6 in the main body 16 may be used. For example, as shown in FIG. 3B, the clip portion has the base end portion of the tongue piece located on the tube end side in the tube axis direction of the glass container 6, and the free end portion of the tongue piece of the glass container 6. As shown in FIG. 4, the base end portion of the tongue piece is located on the tube center portion side in the tube axis direction of the glass container 6 as shown in FIG. The free end portion of the tongue piece may be a clip portion 20a in a direction positioned on the tube end side in the tube axis direction of the glass container 6, and the clip portion 20 in the direction shown in FIG. A configuration in which clip portions in both directions are mixed, such as alternating clip portions 20a in the directions shown in FIG. In addition, it is preferable that the contact part with the clip part 20 in the glass container 6 is the tube axis direction center part side of the glass container 6 rather than the sealing part of the glass container 6. In this case, the power feeding terminal 2 can be attached to the glass container 6 in a stable state while avoiding a sealing portion whose shape tends to be unstable. A gap is preferably provided between the free end portion of the clip portion 20 and the portion of the main body portion 16 other than the clip portion 20. In this case, it is possible to prevent the free end portion from being caught by the main body portion 16 when the power feeding terminal 2 is transferred. Furthermore, as shown in FIG. 3 (c), the gap S ₁ along the direction out tongue extending the free end portion is more preferably 0.1 [mm] or more. Even more preferably, the gap _{S 1} is in the range of 0.2 [mm] or more 1.0 [mm] or less. Further, as shown in FIG. 3 (d), the clearance S ₂ direction end side out tongue extending the free end portion is more preferably 0.2 [mm] or more. Even more preferably, the gap _{S 2} is in the range of 0.3 [mm] or more 1.0 [mm] or less.
The width S ₃ of the gap portion between the inner and outer surfaces of the glass container 6 of the main body portion 16 is preferably at 0.1 [mm] or more. In this case, the glass container 6 can be easily inserted into the main body portion 16. Furthermore, the width _{S 3} of the gap portion between the outer surface of the inner surface and the glass container 6 of the main body portion 16 is more preferably in the range of 0.1 [mm] or more 0.5 [mm] or less. Even more preferably, it is in the range of 0.1 [mm] or more and 0.3 [mm] or less.

Two elastic piece portions 22 and 24 having a long and narrow strip shape are extended from the main body portion 16 so as to face each other, and contact portions 26 and 28 extend from the end portions of the elastic piece portions 22 and 24. It is installed.
The elastic pieces 22 and 24 are bent in such a direction that the base end is the base point and the free end approaches the tube axis.

The contact portions 26, 28 have an arc-shaped cross section, and the inner peripheral surfaces 26 A, 28 A, which are contact portions that directly contact the outer peripheral surface of the lead wire 10, are the surface and the outer peripheral surface of the lead wire 10. It is formed in a shape that matches the outer peripheral surface shape of the lead wire 10 so as to come into contact.
In addition, before the lead wire 10 is inserted between the contact portions 26 and 28, the contact portions 26A and 28A are radially inward of the virtual outer peripheral surface of the lead wire 10 (external lead wire 10B) indicated by a one-dot chain line. Exist.

  When the power supply terminal 2 having the above configuration is extrapolated to the cold cathode fluorescent lamp 4 from the main body portion 16 side, the main body portion 16 in the radial direction with respect to the glass container 6 by the function of the clip portion 20 as described above. Relatively positioned. The elastic clamping portion 18 is expanded outward in the radial direction of the lead wire 10 with the insertion of the lead wire 10 (external lead wire 10B), and the lead wire 10 is clamped by its restoring force. Thereby, the lead wire 10 and the elastic clamping part 18 are electrically connected, and as a result, the lead wire 10 and the main-body part 16 are electrically connected. Further, since the inner side of the elastic pieces 22 and 24 also functions as a guide member for guiding the lead wire 10 to the contact portions 26 and 28, the leading end portion of the lead wire 10 is smoothly inserted between the contact portions 26 and 28. The Rukoto.

  In this way, since the electrical connection is achieved simply by inserting the lead wire 10 into the elastic pinching portion 10 in the axial direction, an excessive force on the lead wire 10 (perpendicular to the axial center of the lead wire 10). Directional force) hardly acts. Therefore, damage to the glass container 6 holding the lead wire 10 can be prevented. Further, even if a force in the tube axis direction of the glass container 6 is applied to the power supply terminal 2, the elastic clamping portion 18 (contact portions 26, 28) only slides in the tube axis direction, so that it is returned to its original position. Thus, the electrical connection state is maintained.

  If the pressing force against the external lead 10B by the contact portions 26 and 28 is at least 100 [gf] regardless of the contact area, the lamp current flowing during lighting is about 4 [mA] to 18 [mA]. It has been confirmed that a good electrical connection can be realized in the cold cathode discharge lamp. Since it is not related to the contact area, the contact form between the contact part and the external lead may be point contact, line contact, or surface contact, and applies to the power supply terminals according to all the embodiments described later. It is. In this example, the pressing force (restoring force) can be adjusted as appropriate depending on the material, shape (length, cross section), and the like of the elastic pieces 22 and 24.

Here, the length L (length along the tube axis of the glass container 6) shown in FIG. 2 of the elastic clamping part 18 has the preferable range of 1.5 [mm]-7 [mm].
Further, when either one of the contact portions 26 and 28 is separated from the lead wire 10 for some reason, the lead wire 10 becomes a so-called cantilever beam having a sealing portion by the glass container 6 as a fixed end. In this case, it has been experimentally known that the lead wire 10 (external lead wire 10B) does not undergo plastic deformation when the bending moment at the fixed end of the lead wire 10 is 1.5 [kgf · mm] or less. Note that an external lead wire made of Ni (nickel) and having a diameter of 0.6 [mm] was used for the experiment. Further, the diameter of the external lead wire 10B is not limited to 0.6 [mm], and may be, for example, 0.8 [mm] which is the same as that in the above embodiment.

  Further, as shown by a two-dot chain line in FIG. 3, the guide member 23 that guides the lead wire 10 (external lead wire 10 </ b> B) to the contact portions 26 and 28 when the power supply terminal 2 is attached to the glass container 6. 25 may be provided. The guide members 23, 25 are located between the outer circumferential elastic pieces 22, 24 of the main body portion 16, and extend from the cylindrical wall of the main body portion 16 in the direction in which the tip portions are close to each other.

Further, in order to facilitate the relative positioning of the power supply terminal 2 with respect to the cold cathode fluorescent lamp 4 in the tube axis direction, a stopper may be provided on the power supply terminal.
FIGS. 5A and 5B are views showing a part of the elastic piece 22 corresponding to the one abutting portion 26 in the power supply terminal 2 provided with a stopper. FIG. 5A is a front view, and FIG. Section AA, (c) shows a right side view. The two-dot chain line indicates the external lead wire 10B.

In this example, the stopper 30 is configured by bending a strip extending from the contact portion 26 at a right angle.
In this way, the power supply terminal 2 can be relative to the cold cathode fluorescent lamp 4 in the tube axis direction only by extrapolating the power supply terminal 2 to the cold cathode fluorescent lamp 4 until the tip of the external lead wire 10B contacts the stopper 30. Positioning will be performed. The stopper may be provided not only on the contact portion 26 but also on the contact portion 28.

  Further, in the above example, the elastic clamping part 18 is constituted by the two elastic clamping piece parts 22 and 24 and the contact parts 26 and 28 provided in each, but the elastic clamping part part of the elastic clamping part The number is not limited to two and may be three or more. If the number is increased, the number of contact points with the lead wire increases, and the electrical connection becomes more reliable. In any case, the elastic clamping piece portions are preferably provided at equal intervals in the circumferential direction of the main body portion.

(Modification 1)
FIG. 6 is a diagram illustrating a modification of the power supply terminal 2 according to the first embodiment. In FIG. 6, the same components as those of the power supply terminal 2 described above are denoted by the same reference numerals, and description thereof is omitted.
(1) In the power supply terminal 2 (FIG. 3), the elastic pieces 22 and 24 have a straight shape, but the elastic pieces 32 and 34 shown in FIG.

  (2) FIG. 6B shows a modification of the contact portion, and is a view seen from the tube axis direction with the power supply terminal mounted on the cold cathode fluorescent lamp. The abutting portions 26 and 28 (FIGS. 2 and 3) are different from each other in cross-sectional shape, and the abutting portions 36 and 38 shown in FIG. It is a simple shape. By doing in this way, even if it is a thin lead wire (external lead wire), the shape as a contact part is securable.

(Modification 2)
FIG. 7 is a diagram illustrating a modification of the power supply terminal 2 according to the first embodiment. 7A and 7C are views seen from the tube axis direction in a state where the power supply terminal is mounted on the cold cathode fluorescent lamp. 7B is a perspective view of the distal end portion of the power feeding terminal 2 shown in FIG. 7A, and FIG. 7D is a perspective view of the distal end portion of the power feeding terminal 2 shown in FIG. 7C. is there. In FIG. 7, the same components as those of the power supply terminal 2 described above are denoted by the same reference numerals, and description thereof is omitted.

Each of the power supply terminals 2 shown in FIG. 7 has a configuration in which a contact portion is caulked to a lead wire in order to ensure electrical more reliable connectivity.
The contact portions 40 and 42 shown in FIGS. 7A and 7B are examples in which the cross-sectional shapes of both contact portions are different. Then, by caulking the portion of the contact portion 40 that is not in contact with the lead wire 10 in the direction of the arrow shown in FIG. 7B, more reliable electrical connection can be obtained, and mechanically This will prevent the lead wires from coming off.

The contact portions 44 and 46 shown in FIGS. 7C and 7D are examples in which the lateral cross-sectional shape is asymmetrical. Then, by caulking the portions of the contact portions 44 and 46 that are not in contact with the lead wire 10 in the direction of the arrow shown in FIG. 7D, more reliable electrical connection can be obtained, and mechanical In addition, the lead wire is prevented from coming off.
<Embodiment 2>
FIG. 8 shows power supply terminals 48 and 53 according to the second embodiment. The power supply terminals 48 and 53 according to the second embodiment are different from the first embodiment in the configuration of the elastic clamping portion. In FIG. 8, the same components as those of the power supply terminal 2 described above are denoted by the same reference numerals, and description thereof is omitted.

  A power supply terminal 48 shown in FIG. 8A extends from the cylindrical wall of the main body portion 16 in parallel with the central axis 16A, and is a strip-like connection portion 50 folded at a right angle in the middle. And an elastic clamping part 52 provided at the extended end. The elastic clamping portion 52 includes a base portion 52A that is a rectangular plate-shaped portion orthogonal to the central axis 16A, and a pair of elastic piece portions 52B and 52C extending from the base portion 52A.

  Each of the elastic piece portions 52B and 52C has a strip shape extending from the opposite side portion of the base portion 52 to the main body portion 16 side. The elastic pieces 52B and 52C are bent in a “<” shape toward the inside (toward the central axis 16A), and the lead wire 10 (FIGS. 1 and 2) is connected between the tops of the bent portions. Hold elastically. In this example, the base 52A plays the same role as the stopper 30 (FIG. 5).

Since the external lead wire 10B is in point contact with the elastic piece portions 52B and 52C, the power supply terminal 48 having the above-described configuration is configured so that the external lead wire 10B is not tilted with respect to the glass container 6 (FIG. 1). It effectively escapes between the tops, and an excessive force is hardly applied to the external lead wire 10B.
Moreover, since the elastic clamping part 52 is excellent in the insertion / removal property of the lead wire 10B, the attachment / detachment property to the glass container 6 of the electric power feeding terminal 48 improves.

  The elastic pinching portion 54 of the power supply terminal 53 shown in FIG. 8B has basically the same configuration as the elastic pinching portion 52 described above. That is, it is composed of a pair of elastic pieces 54B and 54C extending from the base 54A. What is characteristic is that a single belt-like portion extending from the main body portion 16 including the connecting portion 56 is bent at a predetermined position in the longitudinal direction. For this reason, in the electric power feeding terminal 53, the material which comprises the elastic clamping part 54 itself can be decreased, and weight reduction can be achieved as a whole.

  Moreover, the point which is excellent in the insertion property to the elastic clamping part 54 of the external lead wire 10B is the same as that of the elastic clamping part 52 (Fig.8 (a)). On the other hand, the external lead wire 10 </ b> B has a structure that is difficult to be removed from the elastic clamping portion 54. When the external lead wire 10B is pulled out from the elastic clamping portion 54, the connecting portion 56 bends inward (toward the central axis 16A). As a result, the elastic piece portion 54C is similarly displaced inward and presses the external lead wire 10B, and the frictional force increases between the elastic piece portion 54C and the external lead wire 10B. Therefore, once the power supply terminal 53 is attached to the glass container 6, it can be suitably used when it is not necessary to remove it.

Also in this example, the base 54A plays the same role as the stopper 30 (FIG. 5).
<Embodiment 3>
FIG. 9 shows a power supply terminal 58 according to the third embodiment. The power supply terminal according to the third embodiment is also different from the first embodiment in the configuration of the elastic clamping portion. In each of FIGS. 9A to 9D, what is drawn on the right side is a right side view of only the elastic clamping portion. In FIG. 9 as well, the same components as those of the power supply terminal 2 described above are denoted by the same reference numerals, and description thereof is omitted.

Each of the elastic clamping portions 60 and 64 shown in FIGS. 9A and 9B has an arcuate cross section. The elastic clamping portion 60 is an example in which the arc extends from both ends to the end, and the elastic clamping portion 64 is curved in a direction away from each other from the both ends of the arc to the end. It is an example.
The elastic clamping parts 60 and 64 are connected to the main body part 16 by connecting parts 62 and 66, respectively.

The elastic clamping portions 68 and 72 shown in FIGS. 9 (c) and 9 (d) are formed in a shape in which the center of the cross section having a generally “U” shape is bulged in an arc shape. is there. The elastic pinching portion 68 is an example in which the arc extends from both ends to the end, and the elastic pinching portion 72 is curved in a direction away from each other from the both ends of the arc to the end. It is an example.
The elastic clamping portions 68 and 72 are connected to the main body portion 16 by connecting portions 70 and 74, respectively.

In addition, in the state where the lead wire 10 is inserted, the radius of the arc is adjusted so that the inner surface of the arc-shaped portion of the elastic clamping portions 60, 64, 68, 72 is in surface contact with the outer peripheral surface of the lead wire 10. It is set equal to the radius of the external lead wire 10B). Then, in a state in which the lead wire 10 is not inserted, the arc-shaped portion is plastically deformed to be generally recessed. In this way, when the lead wire 10 is inserted, the elastic clamping portions 60, 64, 68, 72 are elastically deformed and expanded outward in the radial direction of the lead wire 10, and the restoring force causes the lead. The wire 10 is pinched. <Embodiment 4>
FIG. 10 shows a power supply terminal 80 according to the fourth embodiment. FIG. 10A is a front view of the cold cathode fluorescent lamp 4 attached to the power supply terminal 80, and FIG. 10B is a right side view thereof.

Since the main body of the power supply terminal 80 has basically the same configuration as that of the main body 16 of the power supply terminal 2 according to the first embodiment, the same reference numerals are given and description thereof is omitted.
The elastic clamping portion 82 includes a pair of elastic piece portions 84 and 86 and contact portions 88 and 90 extending from the elastic piece portions 84 and 86, respectively.
The pair of elastic piece portions 84 and 86 constitute a conical portion 96 having two slits 92 and 94 extending from the main body portion 16 and opened in the tube axis direction of the glass container 6.

A tapered screw 98 is provided on the outer surface of the cone portion 96. The power supply terminal 80 has a ring nut 100 that is screwed with the tapered screw 98.
When the ring nut 100 is tightened in a state where the power supply terminal 80 having the above configuration is externally inserted into the cold cathode fluorescent lamp 4 (the external lead wire 10B is inserted between the contact portions 88 and 90), an elastic piece is obtained. The portions 84 and 86 are deformed inward as a whole, and both contact portions 88 and 90 are in contact with the external lead wire 10B. Further, by tightening the ring nut 100, both the contact portions 88 and 90 are pressed against the external lead wire 10B, thereby holding the external lead wire 10B.

In addition, in a state before the ring nut 100 is screwed, an elastic restoring force of the elastic piece portions 84 and 86 may be applied to already hold the external lead wire 10B. Alternatively, the ring nut 100 may be screwed. For example, the external lead wire 10B may be clamped for the first time in a tightened state.
In the above example, the conical portion has two slits. However, the number of slits to be opened is not limited to two and may be three or more.

Furthermore, it is good also as forming the slit connected with the slit formed in the cone part on the main-body-part side. For example, in FIG. 10A, a pair of slits 102 as indicated by the alternate long and short dash line may be provided at positions facing each other on the cylindrical wall of the main body portion 16 (the other slit does not appear in the figure). ). By doing in this way, the holding force of the glass container 6 by the main body part 16 can also be adjusted by the degree of tightening by the ring nut 100. In particular, it is advantageous when the power supply terminal 80 is used for a plurality of sizes of cold cathode fluorescent lamps having different diameters of the glass container 6.
<Embodiment 5>
FIG. 11 shows a power supply terminal 110 according to the fifth embodiment. The power supply terminal 110 according to the fifth embodiment is different from the first embodiment in the configuration of the main body. In FIG. 11, the same components as those of the power supply terminal 2 described above are denoted by the same reference numerals, and description thereof is omitted.

  The main body portion 112 of the power supply terminal 110 is provided with a plurality of (in this example, six) slits 114 from one end of the cylindrical body along the central axis thereof at regular intervals in the circumferential direction to a predetermined depth in the central axis direction. As a result, a plurality of (six in this example) elastic pieces 118 are extended from one end of the cylindrical body 116 where the slit 114 is not formed (the slit 114 does not reach). It is set as the structure formed.

  Each of the elastic pieces 118 is bent inward as a whole from the vicinity of the base end portion on the cylindrical body portion 116 side, and further, in the vicinity of the free end portion, locally in a “<” shape. It is bent. The reason why the glass container 6 is bent in a “<” shape is that the glass container 6 is not damaged at the corner of the tip of the elastic piece 118 when the power supply terminal 110 is extrapolated to the cold cathode fluorescent lamp. It is to do.

Here, the diameter of the imaginary cylinder inscribed in the top of each elastic piece 118 that protrudes to the inside (the surface side of the glass container 6) of the “<”-shaped bent part is set to be shorter than the outer diameter of the glass container 6. ing.
FIG. 12 is a diagram illustrating a state before and after mounting of the power supply terminal 110 to the cold cathode fluorescent lamp 4.
When the power supply terminal 110 having the above-described configuration is extrapolated to the end of the cold cathode fluorescent lamp 4, the top of each elastic piece 118 comes into contact with the outer periphery of the glass container 6, and the entire elastic piece 118 is The glass container 6 is elastically bent (elastically deformed) outwardly in the radial direction of the glass container 6 with the base end as a base point, and the glass container 6 is held by the restoring force. As a result, the glass container 6 is positioned in the main body portion 112 in a state where the cylindrical body portion 116 and the substantially axial center coincide with each other. Needless to say, the shape, number, arrangement position, and the like of the elastic pieces 118 (slits 114) are not limited to those described above. In short, any configuration that can elastically support the glass container 6 in the main body 112 may be used.
<Embodiment 6>
FIG. 13 shows a power supply terminal 160 according to the sixth embodiment. 13A shows a front view of the power supply terminal 160, and FIG. 13B shows a right side view thereof.

Since the main body of the power supply terminal 160 has basically the same configuration as that of the main body 16 of the power supply terminal 2 according to the first embodiment, the same reference numerals are given and description thereof is omitted.
The elastic clamping part 162 provided in the main body part 16 is manufactured by stamping a metal disk having a spring property (for example, a stainless steel plate) by press working, and its peripheral part is formed by laser welding or the like. It is joined to the end of the.

  The disc-shaped elastic clamping portion 162 has a central portion punched into a shape as shown in FIG. 13B, and a plurality (three in this example) projecting toward the center of the circle. Tongue pieces 162A, 162B, 162C. The tip portions (free end portions) of the tongue pieces 162A, 162B, and 162C have sharp cut surfaces that are press-cut. Needless to say, the tongue pieces 162A, 162B, and 162C are elastic pieces.

The diameter d2 of the imaginary circle in contact with the tip of each of the tongue pieces 162A, 162B, 162C is set smaller than the diameter d1 of the external lead wire 10B.
FIG. 13C is a front view showing a state where the power supply terminal 160 is fitted into the cold cathode fluorescent lamp 2 from the main body 160 side. In FIG. 13C, the elastic clamping portion 162 is drawn in a cross-sectional view cut at a position corresponding to the line BB shown in FIG.

  When the power supply terminal 160 is fitted into the cold cathode fluorescent lamp 2 from the main body 160 side, the tongue pieces 162A, 162B, and 162C bend with their base ends as base points, and the external lead wire 10B is held from three directions by the restoring force. To do. Further, since the tip portions of the tongue pieces 162A, 162B, and 162C, that is, the portion that contacts the external lead wire 10B are sharp edges, the tip portion bites into the outer peripheral surface of the external lead wire 10B.

In this way, by causing the tongue pieces 162A, 162B, and 162C to bite into the outer peripheral surface of the external lead wire 10B, the contact area of the contact portion with the external lead wire 10B increases, and oxidation of the contact portion is prevented. Therefore, the reliability of electrical connectivity is improved.
Needless to say, the number and shape of the tongue pieces (elastic pieces) are not limited to those described above. <Embodiment 7>
FIG. 14 shows a power supply terminal 180 according to the seventh embodiment. FIG. 14A shows a front view of the power supply terminal 180, and FIG. 14B shows a right side view thereof.

Since the main body portion of the power supply terminal 180 is basically the same in configuration as the main body portion 16 of the power supply terminal 2 according to the first embodiment, the same reference numerals are given and description thereof is omitted.
The elastic clamping portion 162 provided in the main body portion 16 is manufactured by forming a metal disk (for example, a spring steel plate) into a shallow cup shape by pressing and punching the bottom portion into a predetermined shape. The bottom peripheral edge is joined to the end of the main body 16 by laser welding or the like. The elastic clamping portion 162 is a so-called tapping nut, and has a configuration in which a pair of tooth portions 182A and 182B are opposed to the bottom portion and project. The facing distance d3 between the tooth portions 182A and 182B shown in FIG. 14B is set shorter than the outer diameter of the external lead wire 10B.

As shown in FIG. 14C, when the power supply terminal 180 having the above configuration is fitted into the cold cathode fluorescent lamp 2 while rotating in the direction of arrow C from the main body 160 side, the teeth 182A and 182B A screw is formed on the outer periphery of the external lead wire 10B. Further, the tooth portions 182A and 182B are slightly bent with the base end portion as a base point, and the external lead wire 10B is held by the restoring force. Since the tips of the teeth 182A and 182B bite into the formed thread groove, the contact area between the tips of the teeth 182A and 182B and the external lead wire 10B increases, and oxidation of the contact portions can be prevented. , Reliability of electrical connectivity will be improved,
Even if the power supply terminal 160 (FIG. 13) according to the sixth embodiment is to be extracted from the cold cathode fluorescent lamp 2, it is difficult to extract the tongue pieces 162A, 162B, 162C because they are biting into the external lead wire 10B. It is. However, since the power supply terminal 180 according to the seventh embodiment can be removed simply by rotating it in the direction opposite to the arrow C in FIG. 14C, it can be reused.
<Eighth embodiment>
FIG. 15 is a perspective view showing a schematic configuration of a direct-type backlight unit 300 having the cold cathode fluorescent lamp 4 as a light source. FIG. 15 is a diagram in which a diffusing plate 308, a diffusing sheet 310, and a lens sheet 312 described later are broken.

  The backlight unit 300 includes an envelope 306 including a rectangular reflecting plate 302 and a side plate 304 surrounding the reflecting plate 302. The reflecting plate 302 and the side plate 304 are both reflecting films (not shown) in which aluminum or the like is vapor-deposited on one main surface (the inner surface when assembled as the envelope 306) of a plate material made of PET (polyethylene terephthalate) resin. Is formed.

In the envelope 306, a plurality of (8 in this example) cold cathode fluorescent lamps 4 are housed as light sources at regular intervals in the short side direction in parallel with the long side of the reflector 302.
In addition, a diffusion plate 308, a diffusion sheet 310, and a lens sheet 312 are provided in the opening of the envelope 306.
A structure for attaching the cold cathode fluorescent lamp 4 to the envelope 306 in the backlight unit 300 will be described with reference to FIG. In the illustrated example, the power supply terminal 2 according to the first embodiment is used, but any of the power supply terminals of other embodiments 2 to 5 including the modification may be used.

On the upper surface of the reflecting plate 302, a connector 314 is formed which is made of, for example, phosphor bronze and is formed by bending a metal plate having spring properties. The cold cathode fluorescent lamp 4 can be attached to the envelope 306 with one touch by fitting the main body portion 16 of the power supply terminal 2 attached to both ends thereof into the corresponding connector 314. As a result, the power supply terminal 2 and the connector 314 are electrically connected, and power from a lighting circuit (not shown) is input to the cold cathode fluorescent lamp 4 through the connector 314 and the power supply terminal 2.
<Problems and solutions for attaching a cold cathode fluorescent lamp equipped with a power supply terminal to a backlight unit>
(1) Since the cold cathode fluorescent lamp 4 is mounted simply by inserting the main body 16 of the power supply terminal 2 from the opening of the connector 314, the cold cathode fluorescent lamp 4 may be displaced in the tube axis direction. is there. For example, in the case of a cold cathode fluorescent lamp provided with a glass container having an elliptical cross section, the mounting direction around the tube axis becomes a problem. In the case of an elliptical cross section, in order to efficiently extract light from the backlight unit, it is preferable that the major axis or minor axis is parallel to the reflecting plate 302. This is because the take-out efficiency is reduced.

FIGS. 17 and 18 are views showing the power supply terminal 120 and the connector 130 that are configured to prevent displacement in the tube axis direction and around the tube axis when the cold cathode fluorescent lamp 4 is attached to the connector. In addition, in the power supply terminal 120, the same code | symbol is attached | subjected about the component substantially the same as the power supply terminal 2 (FIG. 2, FIG. 3) which concerns on Embodiment 1, and the description is abbreviate | omitted.
An engagement hole 124 is formed in the cylindrical wall of the main body 122 of the power supply terminal 110.

  The connector 130 has basically the same configuration as the connector 214 described above. That is, the connector 130 is formed by pressing a long and narrow plate material (phosphor bronze plate) made of phosphor bronze, and includes a pair of sandwiching pieces 130A and 130B that have arc portions and are opposed to each other, and a connecting portion 130C that connects the two. Has been. An engagement protrusion 130D that protrudes inward is provided in the arc-shaped portion of one sandwiching piece 130A. Note that the height of the engagement protrusion 130D from the inner surface of the arc-shaped portion is desirably the same as the thickness of the cylindrical wall of the main body portion 122 of the power supply terminal 124.

In the power supply terminal 120 and the connector 130 having the above-described configuration, when the power supply terminal 120 is fitted into the connector 130 such that the engagement hole 124 is engaged with the engagement protrusion 130D, the cold cathode fluorescent lamp 4 is attached to the connector 130. It is possible to prevent displacement in the tube axis direction and around the tube axis.
(2) Since the outer periphery of the main body of the power supply terminal described so far is a cylindrical surface as a whole, when the cold cathode fluorescent lamp equipped with this is arranged on a flat work table to be attached to the backlight unit, There may be a problem that it is easy to roll on the workbench and difficult to handle.

FIG. 19 is a diagram showing a power supply terminal 140 that has a structure that does not easily roll even when placed on a flat surface. In FIG. 19, the same components as those of the power supply terminal 120 (FIGS. 17 and 18) described above are denoted by the same reference numerals, and description thereof is omitted.
In the power supply terminal 140, a part of the outer peripheral surface of the main body 142 is a flat surface 144. Thus, by providing the main surface 142 with the flat surface 144, the cold cathode fluorescent lamp equipped with the flat surface 144 is less likely to roll on the flat surface. In this case, the mounting angle (angle around the tube axis) of both power supply terminals 140 is adjusted so that both flat surfaces 144 of the power supply terminals 140 provided at both ends of the cold cathode fluorescent lamp 4 are located on the same plane. It is preferable to keep it.

The lower part of FIG. 19 shows a preferable structure of the connector 150 when the power supply terminal 140 configured as described above is employed. In FIG. 19, the same components as those of the power supply terminal 130 (FIGS. 17 and 18) described above are denoted by the same reference numerals, and description thereof is omitted.
One clamping piece 152 in the connector 150 is provided with a flat portion 152A that matches the flat surface 144 of the power supply terminal 140. As shown in FIG. 20, if the power supply terminal 140 is fitted into the connector 130 so that the flat surface 144 engages with the flat portion 152 </ b> A, the cold cathode fluorescent lamp 4 is shifted around the tube axis with respect to the connector 130. Can be prevented.

  (3) Feeding terminal 2 according to Embodiment 1 (FIG. 3), feeding terminal according to Embodiment 2 (FIG. 8), feeding terminal according to Embodiment 3 (FIG. 9), feeding according to Embodiment 4 In the terminal 80 (FIG. 10) and the power supply terminal 110 (FIGS. 11 and 12) according to the fifth embodiment, the elastic pinching portion (for example, the elastic pinching portion 18 in the power supply terminal 2 of the first embodiment) is the main body portion. 16, the glass container 6 that supports the lead wire 10 due to the projecting portion colliding with a work table or other cold-cathode fluorescent lamps during handling such as attachment to the backlight unit. There is a risk that parts will be damaged.

FIG. 21 is a diagram illustrating a power supply terminal 190 configured to cope with such a problem. In addition, in the power supply terminal 190, the same code | symbol is attached | subjected about the component substantially the same as the power supply terminal 2 (FIG. 2, FIG. 3) which concerns on Embodiment 1, and the description is abbreviate | omitted.
The power supply terminal 190 has a configuration in which protective portions 192 and 194 that surround the external lead wire 10B from a direction orthogonal to the tube axis extend between the elastic pieces 22 and 24 at the end of the main body portion 16.

Thus, by providing the protection portions 192 and 194 surrounding the external lead wire 10B, the external lead wire 10B can be protected from external force as much as possible.
In the above example, the protection portions 192 and 194 are extended from the main body portion 16. However, the protection portions 192 and 194 are separated from the main body portion 16, and are attached to the main body portion 16 so as to be integrated with the main body portion 16. It does not matter if they are joined. FIG. 22 shows a power supply terminal 196 configured as such.

In the power supply terminal 196 as well, the same components as those of the power supply terminal 2 (FIGS. 2 and 3) according to Embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.
The power supply terminal 196 is configured by adding a protective member 198 to the structure of the power supply terminal 2 of the first embodiment.
The protection member 198 has a cylindrical shape, and is joined to the main body portion 16 by laser welding or the like after one end portion is extrapolated to the main body portion 16. Thus, by providing the protective member 198 surrounding the external lead wire 10B, the external lead wire 10B can be protected from external force as much as possible.

Furthermore, the following configuration can prevent the cold cathode fluorescent lamp 4 from being displaced around the tube axis with respect to the connector.
At one end of the protective member 198, notches 198A and 198B as shown in the illustrated example are provided.
On the other hand, the connector 200 is provided with engagement protrusions 130E and 130F that engage with the notches 198A and 198B when the power supply terminal 196 is fitted. In the socket 200 shown in FIG. 22, the same reference numerals are given to the same components as those of the socket 130 shown in FIG. 17, and the description thereof is omitted.

The engagement protrusions 130E and 130F are provided at end portions of an extending portion 130D that extends from the connecting portion 130C in the tube axis direction.
An engagement hole (not shown) may be used instead of the notches 198A and 198B. Further, the engagement protrusions 130E and 130F may be provided separately from the connector. Furthermore, the number of the notches 198A and 198B and the engagement holes is not limited to two and may be one. Or three or more may be sufficient. The number of engaging protrusions may be changed as appropriate according to the number of notches and engaging holes.
<Embodiment 9>
FIG. 23 shows an outline of a liquid crystal display device 320 according to the ninth embodiment. The liquid crystal display device 320 is, for example, a 32 [inch] liquid crystal television and, as shown in FIG. 23, lights up with a liquid crystal screen unit 322 including a liquid crystal panel and the like, and a backlight unit 300 arranged on the back of the liquid crystal screen unit 322. A circuit 324.

The liquid crystal screen unit 322 is a publicly known one and includes a liquid crystal panel (color filter substrate, liquid crystal, TFT substrate, etc.) (not shown), a drive module, etc. (not shown), and is based on an image signal from the outside. To form a color image.
The lighting circuit 324 lights the cold cathode fluorescent lamp 4 (FIGS. 15 and 16) inside the backlight unit 300. The cold cathode fluorescent lamp 4 is operated at a lighting frequency of 40 [kHz] to 100 [kHz] and a lamp current of 4 [mA] to 18 [mA].

As described above, the present invention has been described based on the embodiment. However, the present invention is not limited to the above-described form, and for example, the following form may be adopted.
(1) In the above embodiment, a cold cathode fluorescent lamp has been described as an example of a cold cathode discharge lamp. However, the present invention is not limited to a fluorescent lamp and can be applied to a cold cathode ultraviolet lamp. That is, the phosphor film may be removed from the configuration of the cold cathode fluorescent lamp according to the above-described embodiment (the phosphor film is not formed) and applied to a configuration configured as a cold cathode ultraviolet lamp. The ultraviolet lamp irradiates an irradiated object with ultraviolet rays and is used for sterilization of the irradiated object.
(2) In the above embodiment, the electrical connection with the lead wire (external lead wire) is achieved only by the elastic restoring force of the elastic clamping portion in the power supply terminal, but in order to ensure more reliable connectivity, the lead The wire (external lead wire) and the contact portion may be joined by laser welding, resistance welding, arc welding, or the like.
(3) In the first to fifth embodiments (FIGS. 1 to 12), the power supply terminal in which the main body portion and the elastic clamping portion are integrated by pressing one metal plate is manufactured. The main body portion and the elastic pinching portion may be manufactured separately, and then the main body portion and the elastic pinching portion may be joined together to be integrated.
(4) glass used in a glass container for a glass container, in terms of oxide, SiO ₂ is 60 [wt%] ~75 [wt ]%, Al 2 O 3 is 1 [wt%] ~5 [wt %], Li ₂ O is 0 [wt%] to 5 [wt%], K ₂ O is 3 [wt%] to 11 [wt%], Na ₂ O is 3 [wt%] to 12 [wt%], and CaO is 0 [wt%] to 9 [wt%], MgO from 0 [wt%] to 9 [wt%], SrO from 0 [wt%] to 12 [wt%], BaO from 0 [wt%] to 12 [wt%] wt%]. In this case, it is possible to provide an environment-friendly cold cathode fluorescent lamp that does not contain a lead component. Furthermore, the glass used for the glass container is, in terms of oxide, SiO ₂ of 60 [wt%] to 75 [wt]%, Al ₂ O ₃ of 1 [wt%] to 5 [wt%], B ₂ O. ₃ is 0 [wt%] to 3 [wt%], Li ₂ O is 0 [wt%] to 5 [wt%], K ₂ O is 3 [wt%] to 11 [wt%], and Na ₂ O is 3 [wt%] to 12 [wt%], CaO from 0 [wt%] to 9 [wt%], MgO from 0 [wt%] to 9 [wt%], and SrO from 0 [wt%] to 12 [wt%] wt%] and BaO more preferably have a composition of 0 [wt%] to 12 [wt%].

Moreover, the glass used for the glass container is 60 [wt%] to 75 [wt]% in SiO ₂ , 1 [wt%] to 5 [wt%] in Al ₂ O ₃ , and Li ₂ O in terms of oxide. 0.5 [wt%] to 5 [wt%], K ₂ O 3 [wt%] to 7 [wt%], Na ₂ O 5 [wt%] to 12 [wt%], and CaO 1 [ wt%]-7 [wt%], MgO 1 [wt%]-7 [wt%], SrO 0 [wt%]-5 [wt%], BaO 7 [wt%]-12 [wt%] It may have the composition of]. In this case, it is possible to provide an environment-friendly cold cathode fluorescent lamp that is easy to process into a lamp and does not contain a lead component.

Furthermore, the glass used for the glass container has an oxide conversion of SiO ₂ of 65 [wt%] to 75 [wt]%, Al ₂ O ₃ of 1 [wt%] to 5 [wt%], B ₂ O _3. There 0 [wt%] ~3 [wt %], Li 2 O is 0.5 [wt%] ~5 [wt %], K 2 O is 3 [wt%] ~7 [wt %], Na 2 O Is 5 [wt%] to 12 [wt%], CaO is 2 [wt%] to 7 [wt%], MgO is 2.1 [wt%] to 7 [wt%], and SrO is 0 [wt%]. -0.9 [wt%], BaO may have a composition of 7.1 [wt%] to 12 [wt%]. In this case, it does not contain a lead component, has an electrical insulating property suitable for lighting applications, and can prevent devitrification. Furthermore, the glass used for the glass container is, in terms of oxide, SiO ₂ of 65 wt% to 75 wt%, Al ₂ O ₃ of 1 wt% to 3 wt%, B ₂ O. ₃ 0 [wt%] ~3 [wt %], Li 2 O is 1 [wt%] ~3 [wt %], K 2 O is 3 [wt%] ~6 [wt %], Na 2 O is 7 [wt%] to 10 [wt%], CaO from 3 [wt%] to 6 [wt%], MgO from 3 [wt%] to 6 [wt%], and SrO from 0 [wt%] to 0. It is more preferable that 9 [wt%] and BaO have a composition of 7.1 to 10 [wt%].
(5) Phosphor of phosphor layer (5-1) UV absorption For example, recently, with the increase in size of liquid crystal color televisions, polycarbonate with good dimensional stability is used for the diffusion plate that closes the opening of the backlight unit. It has come to be. This polycarbonate is easily deteriorated by ultraviolet rays having a wavelength of 313 [nm] emitted from mercury. In such a case, a phosphor that absorbs ultraviolet light having a wavelength of 313 [nm] may be used. The following phosphors absorb 313 [nm] ultraviolet rays.
(A) Blue europium / manganese co-activated barium aluminate / strontium / magnesium [Ba _1-xy Sr _x Eu _y Mg _1-z Mn _z Al ₁₀ O ₁₇ ] or [Ba _1-xy Sr _x Eu _{y Mg 2-z Mn z Al} 16 O 27]
Here, x, y, and z are preferably numbers satisfying the conditions of 0 ≦ x ≦ 0.4, 0.07 ≦ y ≦ 0.25, and 0 ≦ z <0.1, respectively.

Examples of such a phosphor include europium activated barium magnesium aluminate [BaMg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ ], [BaMgAl ₁₀ O ₁₇ : Eu ²⁺ ] (abbreviation: BAM-B), and europium attached. There are active barium aluminate / strontium / magnesium [(Ba, Sr) Mg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ ], [(Ba, Sr) MgAl ₁₀ O ₁₇ : Eu ²⁺ ] (abbreviation: SBAM-B), and the like.
(B) Green • Manganese inactive magnesium gallate [MgGa ₂ O ₄ : Mn ²⁺ ] (abbreviation: MGM)
Manganese activated cerium aluminate, magnesium, zinc [Ce (Mg, Zn) Al ₁₁ O ₁₉ : Mn ²⁺ ] (abbreviation: CMZ)
Terbium-activated cerium aluminate / magnesium [CeMgAl ₁₁ O ₁₉ : Tb ³⁺ ] (abbreviation: CAT)
Europium / manganese co-activated barium aluminate / strontium / magnesium [Ba _1-xy Sr _x Eu _y Mg _1-z Mn _z Al ₁₀ O ₁₇ ] or [Ba _1-xy Sr _x Eu _y Mg _{2 -z} Mn _z Al ₁₆ O _27]
Here, x, y and z are numbers satisfying the conditions of 0 ≦ x ≦ 0.4, 0.07 ≦ y ≦ 0.25, and 0.1 ≦ z ≦ 0.6, respectively, and z is 0.4 It is preferable that ≦ x ≦ 0.5.

Examples of such phosphors include europium / manganese co-activated barium aluminate / magnesium [BaMg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ , Mn ²⁺ ], [BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , Mn ²⁺ ] (abbreviation) : BAM-G), europium / manganese co-activated barium aluminate / strontium / magnesium [(Ba, Sr) Mg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ , Mn ²⁺ ], [(Ba, Sr) MgAl ₁₀ O ₁₇ : Eu ²⁺ , Mn ²⁺ ] (abbreviation: SBAM-G).
(C) Red • Europium activated phosphorus • Yttrium vanadate [Y (P, V) O ₄ : Eu ³⁺ ] (abbreviation: YPV)
Europium activated yttrium vanadate [YVO ₄ : Eu ³⁺ ] (abbreviation: YVO)
Europium-activated yttrium oxysulfide [Y ₂ O ₂ S: Eu ³⁺ ] (abbreviation: YOS)
Manganese-activated magnesium fluoride germanate [3.5MgO.0.5MgF ₂ .GeO ₂ : Mn ⁴⁺ ] (abbreviation: MFG)
Dysprosium-activated yttrium vanadate [YVO ₄ : Dy ³⁺ ] (red and green two-component phosphor, abbreviation: YDS)
In addition, you may mix and use the fluorescent substance of a different compound with respect to one type of luminescent color. For example, only BAM-B (absorbs 313 [nm]) in blue, LAP (does not absorb 313 [nm]) in green, BAM-G (absorbs 313 [nm]) in green, and YOX in red Alternatively, a phosphor of YVO (absorbs 313 [nm]) may be used. In such a case, as described above, the phosphor that absorbs the wavelength 313 [nm] is adjusted so that the total weight composition ratio is larger than 50%, so that the ultraviolet rays almost leak out of the glass bulb. Can be prevented. Therefore, when the phosphor layer 105 includes a phosphor that absorbs ultraviolet rays of 313 [nm], deterioration due to ultraviolet rays such as a diffusion plate made of polycarbonate (PC) that closes the opening of the backlight unit is suppressed, The characteristics as a backlight unit can be maintained for a long time.

Here, “absorbing ultraviolet rays of 313 [nm]” means an excitation wavelength spectrum near 254 [nm] (excitation wavelength spectrum means excitation light emission while changing the wavelength of the phosphor, and the excitation wavelength and emission intensity are changed. The intensity of the excitation wavelength spectrum at 313 [nm] is defined as 80 [%] or more. That is, the phosphor that absorbs ultraviolet rays of 313 [nm] is a phosphor that can absorb ultraviolet rays of 313 [nm] and convert it into visible light.
(5-2) High color reproduction Liquid crystal display devices typified by liquid crystal color televisions are used as a light source for a backlight unit of the liquid crystal display device in accordance with the recent high color reproduction performed as part of the improvement in image quality. There is a need to expand the reproducible chromaticity range in the cold cathode discharge lamp and the external electrode discharge lamp.

  In response to such a request, for example, by using the following phosphor, the chromaticity range can be expanded as compared with the case of using the phosphor in the embodiment. Specifically, in the CIE1931 chromaticity diagram, the chromaticity coordinate value of the phosphor for high color reproduction includes a triangle formed by connecting the chromaticity coordinate values of the three phosphors used in the embodiment. Located at the coordinates that expand the reproduction range.

(A) Blue • Europium activated strontium chloroapatite [Sr ₁₀ (PO ₄ ) ₆ Cl ₂ : Eu ²⁺ ] (abbreviation: SCA), chromaticity coordinates: x = 0.151, y = 0.065
In addition to the above, europium-activated strontium, calcium, barium, chloroapatite [(Sr, Ca, Ba) ₁₀ (PO ₄ ) ₆ Cl ₂ : Eu ²⁺ ] (abbreviation: SBCA) can also be used, and the wavelength 313 (nm) SBAM-B, which can absorb the ultraviolet rays, can also be used for high color reproduction.

(B) Green BAM-G, chromaticity coordinates: x = 0.139, y = 0.574
CMZ, chromaticity coordinates: x = 0.164, y = 0.722
CAT, chromaticity coordinates: x = 0.267, y = 0.663
As described above, these can also absorb ultraviolet rays having a wavelength of 313 [nm], and in addition to the three phosphor particles described here, MGM can also be used for high color reproduction.

(C) Red • YOS, chromaticity coordinates: x = 0.651, y = 0.344
YPV, chromaticity coordinates: x = 0.658, y = 0.333
MFG, chromaticity coordinates: x = 0.711, y = 0.287
As described above, these can also absorb ultraviolet rays having a wavelength of 313 [nm], and besides the three phosphor particles described here, YVO and YDS can also be used for high color reproduction.

  In addition, the chromaticity coordinate values shown above are representative values measured only with each phosphor powder, and due to the measurement method (measurement principle), etc., the chromaticity coordinates indicated by each phosphor powder The value may be slightly different from the value listed above. For reference, the chromaticity coordinate values of the phosphor powders of the first embodiment are YOX (x = 0.644, y = 0.353), LAP (x = 0.351, y = 0.585). , BAM-B (x = 0.148, y = 0,056).

Furthermore, the phosphor used for emitting each color of red, green, and blue is not limited to one type for each wavelength, and a plurality of types may be used in combination.
Here, the case where a phosphor layer is formed using the above-described phosphor particles for high color reproduction will be described. In this evaluation, there are three evaluations in the case of using a phosphor for high color reproduction based on the area of the NTSC triangle (NTSC triangle) connecting the chromaticity coordinate values of the three primary colors of the NTSC standard in the CIE1931 chromaticity diagram. This is performed by the ratio of the area of triangles that can connect chromaticity coordinate values (hereinafter referred to as NTSC ratio).

  For example, when BAM-B is used as blue, BAM-G as green, and YVO as red (Example 1), the NTSC ratio is 92%, and SCA is used as blue, BAM-G as green, and YVO as red. (Example 2) When NTSC ratio is 100%, SCA is used as blue, BAM-G is used as green, and YOX is used as red (Example 3), NTSC ratio is 95%. The luminance can be improved by 10 [%] as compared with the above.

  Note that the chromaticity coordinate values used in the evaluation here are measured in a state where a liquid crystal display device incorporating a lamp or the like is used, so that the color reproduction range varies from the above value depending on the combination with the color filter. there is a possibility.

  The power supply terminal according to the present invention can be suitably used as, for example, a power supply terminal attached to an end of a cold cathode fluorescent lamp used as a light source of a backlight unit constituting a liquid crystal display device.

2, 80, 110, 120, 140, 160, 180, 190, 196 Feed terminal 4 Cold cathode fluorescent lamp 6 Glass container 10 Lead wire 16, 112, 122, 142 Main body 18, 52, 54, 60, 68, 82 , 162,182 Elastic clamping part

Claims (8)

A power supply terminal attached to the end of a cold cathode discharge lamp having a tubular glass container and a lead wire sealed to the end of the glass container and extending outward in the tube axis direction,
A body part extrapolated to the outer periphery of the end of the glass container;
An elastic pinching portion provided in the main body portion and holding the lead wire with an elastic restoring force in a state where the lead wire is inserted;
A power supply terminal comprising: The elastic clamping portion includes at least two elastic piece portions extending from the main body portion, and an abutting portion that is provided at each distal end portion of the elastic piece portion and comes into contact with the outer periphery of the lead wire,
2. The power supply terminal according to claim 1, wherein in a state before the lead wire is inserted, a contact portion with the lead wire in the contact portion exists radially inside the virtual outer peripheral surface of the lead wire. . The main body has a cylindrical shape,
The elastic clamping portion is provided at the tip of the cone portion extending from the main body portion and having at least two slits opened in the tube axis direction, and the outer peripheral surface of the lead wire And an abutting part that abuts,
A taper screw is provided on a part of the outer surface of the cone part,
The power feeding terminal according to claim 1, wherein the power feeding terminal further includes a ring nut screwed with the taper screw.   4. The power supply terminal according to claim 2, wherein the contact portion of the contact portion is formed in a shape suitable for an outer peripheral surface of the lead wire and is in surface contact with the outer periphery of the lead wire.   The said contact part presses the said lead wire with the pressing force more than 100 [gf] by the said elastic restoring force in the state in which the said lead wire was inserted in the said elastic clamping part, The Claim 2 characterized by the above-mentioned. The power feeding terminal according to any one of 4. A power supply terminal having a tubular glass container and a lead wire sealed to the end of the glass container and extending outward in the tube axis direction, and having a power supply terminal attached to the end of the glass container With cold cathode discharge lamp,
The power supply terminal is the power supply terminal according to any one of claims 1 to 5,
The cold cathode discharge lamp with a power feeding terminal, wherein the main body is extrapolated to an outer periphery of an end of the glass container, and the lead wire is inserted into the elastic clamping portion.   A backlight unit comprising the cold cathode discharge lamp with a power feeding terminal according to claim 6 as a light source. A liquid crystal display panel;
The backlight unit according to claim 7 disposed on the back surface of the liquid crystal display panel;
A liquid crystal display device comprising:

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