CN101802494A - Feeding terminal, cold cathode discharge lamp having feeding terminal, backlight unit having the cold cathode discharge lamp, and liquid crystal display device having the backlight unit - Google Patents

Abstract

A feeding terminal (2) is mounted on the end of a cold cathode discharge lamp including: a tube-shaped glass vessel (6); and an external lead line (10B) sealed into the end of the glass vessel (6) and extending outward in the tube axis direction. The feeding terminal (2) includes a main body (16) into which the end of the glass vessel (6) is inserted; and an elastically sandwiching unit (112) arranged on the main body (16) so as to sandwich the external lead line (10B) with an elastic resilience in the state when the external lead line (10B) is inserted. This assures an electric connection with a lead line (10) and prevents damage of the glass tube when arranging the glass tube in a cold cathode discharge lamp (4).

Description

Power supply terminal, cold cathode discharge lamp with the same, backlight unit with the cold cathode discharge lamp, and liquid crystal display device with the backlight unit

technical field

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

Background technique

As a kind of cold cathode discharge lamp, the cold cathode fluorescent lamp is suitable for realizing miniaturization of tube diameter, and thus it is suitable for use as a light source of a backlight unit which requires thinning (miniaturization). In order to install the cold cathode fluorescent lamp on the backlight unit and to facilitate 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.

The power supply terminal is composed of a cylindrical main body and a lead connecting part extending from the main body. The main body part is externally inserted into the end part of the hermetically sealed glass tube in the cold cathode fluorescent lamp, and the lead wire connection part is electrically connected to the lead wire.

Using the power supply terminal constituted by the above-mentioned structure, the main body of the power supply terminal is embedded in the connector provided in the backlight unit, and the cold cathode fluorescent lamp can be mounted on the backlight unit with one touch. Power can be supplied from the lighting power supply via the connector and power supply terminals.

Needless to say here, the lead wire connection portion in the power supply terminal is an important part for reliably transmitting electric energy from the lighting power supply to the cold cathode fluorescent lamp, and various configurations have been proposed in the past.

For example, Patent Document 1 discloses a technology in which the end of a rectangular connecting piece extending from the main body along the tube axis direction of the glass tube is folded into a right angle, and a lead wire is inserted into the folded portion. hole. Then, solder is injected in a state where the lead wire is inserted into the through hole so as to fill the gap between the lead wire and the through hole and electrically connect the two.

Thereby, the lead wire and the connection piece are electrically connected reliably by solder.

Patent Document 1: Japanese Patent Laid-Open No. 2007-234551

However, although it can be said that solder also 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 direction of the tube axis, the solder is peeled off from one member, or the solder itself is cracked, resulting in a problem that the lead wire and the connection piece cannot be electrically connected.

In order to solve this problem, it is also conceivable to form the top end of the connecting piece into an appropriate shape and then crimp the top end to the lead wire. However, when riveting, the lead wire will receive excessive force (force in the radial direction of the lead wire). As a result, it is expected that there will be a problem that cracks (damages) occur in the glass tube portion for holding the lead wire.

Contents of the invention

The present invention is proposed by referring to the above problems, and its purpose is to provide a power supply terminal that can ensure the electrical connection with the lead wire as reliably as possible, and can prevent the glass tube from being damaged when it is installed on the cold cathode discharge lamp, and has The cold cathode discharge lamp of the power supply terminal, etc.

To achieve the above objects, the power supply terminal of the present invention relates to a power supply terminal attached to an end of a cold cathode discharge lamp having a tubular glass container and an end of the glass container sealed and simultaneously The lead wire extending outward along the tube axis direction is characterized in that the power supply terminal has: a main body inserted on the outer periphery of the end of the glass container; and an elastic clamping part arranged on the main body, The lead wire is held by an elastic restoring force in a state where the lead wire is inserted.

In addition, it is characterized in that the elastic clamping portion includes: at least two elastic pieces extending from the main body, and a top end portion of these elastic pieces that is in contact with the outer circumference of the lead wire. In the abutment portion, in a state before the lead wire is inserted, a portion of the abutment portion that contacts the lead wire is located radially inward from a virtual outer peripheral surface of the lead wire.

Or, it is characterized in that, the main body part is cylindrical, and the elastic clamping part includes: a conical part extending from the main body part and having at least two slits opened in the direction of the tube axis , and an abutting portion arranged on the top end of the conical body and abutting against the outer peripheral surface of the lead wire, a part of the outer surface of the conical body is provided with a tapered thread, and the power supply terminal further has a thread that is compatible with the tapered thread Combined ring nut.

In addition, it is characterized in that the abutting portion on the abutting portion is formed in a shape conforming to the outer peripheral surface of the lead wire, and is in surface contact with the outer peripheral surface of the lead wire.

Furthermore, in a 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] or more by the elastic restoring force.

To achieve the above object, the cold cathode discharge lamp of the present invention relates to a cold cathode discharge lamp with a power supply terminal, which has a tubular glass container and is sealed at the end of the glass container while extending outward along the tube axis direction. The lead wire of the glass container is equipped with a power supply terminal at the end of the glass container, wherein the power supply terminal is the power supply terminal described above, the main body is inserted on the outer periphery of the end of the glass container, and the lead wire is inserted into the in the elastic clamping portion.

To achieve the above object, a backlight unit according to the present invention is characterized by comprising the above-mentioned cold cathode discharge lamp with a power supply terminal as a light source.

To achieve the above objects, a liquid crystal display device according to the present invention is characterized by comprising a liquid crystal display and the above-mentioned backlight unit disposed on the back surface of the liquid crystal display.

According to the power supply terminal constituted as described above, the elastic clamping portion thereof clamps the lead wire by elastic restoring force in a state where the lead wire is inserted thereinto, thereby realizing electrical connection. Therefore, the above-mentioned problems caused by adding solder or the like therein to realize the electrical connection between the two do not easily occur. Therefore, electrical connection can be reliably performed.

Furthermore, the lead wire can be held by the elastic holding portion by being inserted, and therefore, it is not easy to apply excessive force to the lead wire when attaching the power supply terminal to the cold cathode discharge lamp. Therefore, it is possible to prevent the glass tube from being damaged when installed on a cold cathode discharge lamp.

Description of drawings

Fig. 1 is a partially cutaway perspective view of a cold cathode fluorescent lamp including a power supply terminal according to a first embodiment.

Fig. 2 is a longitudinal sectional view and a right side view of one end portion of the above cold cathode fluorescent lamp.

3 is a view showing the power supply terminal of the first embodiment, (a) is a perspective view of the power supply terminal before being attached to the glass container, (b) is a perspective view of the power supply terminal after being attached, and (c) is for explanation The figure of the gap _S1 , _S2 between the free end part of the clip part and the part of the main part except the clip part, (d) is for explaining the gap between the inner surface of the main part and the outer surface of the glass container. Diagram of the width _S3 of the void.

FIG. 4 is a diagram showing a power supply terminal of a modified example of the first embodiment.

Fig. 5 is a diagram showing an example in which a stopper is provided on the above-mentioned power supply terminal, wherein the abutting portion of the power supply terminal and a part of the corresponding elastic piece are shown, (a) is a front view, (b) It is cross-section AA in (a), and (c) is a right side view.

6( a ), ( b ) are diagrams showing modified examples of the above-mentioned power supply terminal.

7( a ), ( b ) and ( c ), ( d ) are diagrams showing modification examples of the above-mentioned power supply terminals, respectively.

FIG. 8 is a diagram showing a power supply terminal according to the second embodiment.

FIG. 9 is a diagram showing a power supply terminal of a third embodiment.

10 is a front view and a right side view of one end portion of a cold cathode fluorescent lamp to which a power supply terminal according to a fourth embodiment is attached.

FIG. 11 is a diagram showing a power supply terminal according to a fifth embodiment.

Fig. 12 is a diagram showing states before and after the power supply terminal of the fifth embodiment is attached to a cold cathode fluorescent lamp.

FIG. 13 is a diagram showing a power supply terminal according to a sixth embodiment.

FIG. 14 is a diagram showing a power supply terminal according to a seventh embodiment.

FIG. 15 is a diagram showing a backlight unit according to the embodiment.

Fig. 16 is a view showing the mounting structure of the cold cathode fluorescent lamps in the above-mentioned backlight unit mounted on the housing.

FIG. 17 is a diagram showing an example of a power supply terminal and a connector.

FIG. 18 is a diagram showing a cross section in a state where the power supply terminal shown in FIG. 17 is fitted into the connector.

FIG. 19 is a diagram showing an example of a power supply terminal and a connector.

FIG. 20 is a diagram showing a cross section in a state where the power supply terminal shown in FIG. 19 is fitted into the connector.

FIG. 21 is a diagram showing an example of a power supply terminal.

Fig. 22 is a diagram showing an example of a power supply terminal and a connector.

FIG. 23 is a partially cutaway perspective view showing a liquid crystal display device according to the embodiment.

Explanation of symbols

2, 80, 110, 120, 140, 160, 180, 190, 196... Power supply terminals

4......Cold-cathode fluorescent lamps

6...glass container

10......Leader

16, 112, 122, 142...Main part

18, 52, 54, 60, 68, 82, 162, 182...Elastic clamping part

Detailed ways

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

(first embodiment)

1 is a partially cutaway perspective view showing a schematic configuration of a power supply terminal 2 and a cold cathode fluorescent lamp 4 provided at both ends of the first embodiment, and FIG. 2 is a longitudinal sectional view of an end portion. However, in all drawings including FIG. 1 and FIG. 2 , the scales of the components are not consistent.

The cold cathode fluorescent lamp 4 has a glass container 6 with a circular cross section. The glass container 6 is a hermetically sealed container in which lead wires 10 described later are sealed at both ends of a glass tube. In addition, the glass container 6 is not limited to the straight tube shape illustrated in the figure, but may be curved such as a U-shaped tube, a U-shaped tube, an S-shaped tube, a W-shaped tube, or a spiral tube. In addition, the cross section of the glass container (glass tube) is not limited to a circle, and may be a flat shape such as an ellipse.

The glass container 6 is made of borosilicate glass for sealing tungsten wires, and an example of its size is 730 [mm] in total length, 4 [mm] in outer diameter, and 3 [mm] in inner diameter. In addition, the material of the glass container 6 is not limited to borosilicate glass, and may also be lead glass, lead-free glass, soda-lime glass or other soft glass.

The inside of the glass container 6 is sealed with about 1200[μg] mercury (not shown) and about 8[kPa] (20[°C]) neon-argon mixed gas as a rare gas. Wherein, krypton may also be contained in the rare gas. In this case, infrared radiation from the cold cathode discharge lamp can be suppressed. Furthermore, it is preferable that krypton contained in the rare gas is in the range of 0.5 [mol%] or more and 5 [mol%] or less. In this case, the infrared radiation of the cold cathode discharge lamp can be suppressed without greatly changing the lamp voltage. 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%], Krypton is 0.5 [mol%] and less than or equal to 5 [mol%] in the range. Furthermore, it is more preferable that the krypton contained in the rare gas is in the range of 0.5 [mol%] or more and 3 [mol%] or less. Furthermore, it is more preferable that the krypton contained in the rare gas is in the range of 1 [mol%] or more and 3 [mol%] or less.

In addition, a phosphor film 8 is formed on the inner surface of the glass container 6 . Phosphor film 8 contains three 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) was used as the blue phosphor, and cerium-terbium-activated lanthanum phosphate [LaPO ₄ : Ce ³⁺ , Tb ³⁺ ] (abbreviation: LAP), and europium-activated yttrium oxide [Y ₂ O ₃ :Eu ³⁺ ] (abbreviation: YOX) was used as the red phosphor.

The lead 10 is a connecting wire of an inner lead 10A made of tungsten and an outer lead 10B made of nickel. An inner lead 10A portion of the lead 10 is sealed inside the end portion of the glass container 6, and an outer lead 10B extends outward in the tube axial direction from the sealed portion. Both the inner lead 10A and the outer lead 10B have a circular cross section. For example, the wire diameter of the inner lead 10A is 0.8 [mm] and the overall length is 3 [mm]; the wire diameter of the outer lead 10B is 0.6 [mm] and the overall length is 4 [mm]. In addition, when the glass container 6 is borosilicate glass for Kovar wire sealing, it is preferable that the inner lead 10A is made of an alloy of iron, nickel and cobalt (Kovar) or molybdenum. In addition, when the glass container 6 is lead-free glass or soda glass, it is preferable that the inner lead wire 10A is made of an alloy of iron and nickel or a Dumet wire.

The electrode 12 is joined to the end portion of the inner lead 10A sealed in the end portion of the glass container 6 on the inner side of the glass container 6 by laser welding or the like. The electrode 12 is a so-called hollow electrode in a cylindrical shape with a bottom, and is processed from a niobium rod. The reason why the electrode 12 is a hollow electrode is that it can effectively suppress sputtering in the electrode due to discharge during lamp lighting (for details, please refer to Japanese Patent Application Laid-Open No. 2002-289138, etc.). In addition, the material used for the electrode 12 is not limited to niobium, and may be, for example, nickel, tantalum, molybdenum, tungsten, or the like. In addition, the electrode 12 and the inner lead 10A may be soldered with solder made of nickel foil or Kovar wire alloy foil, for example.

An electron-emitting substance layer (not shown) may also be formed on the surface of the electrode 12 . In this case, the lamp voltage can be reduced compared to a lamp not provided with an electron-emitting substance layer. In addition, since the power supply terminal 2 described later is provided, it is easy to dissipate the heat generated by the electrode 12 through the power supply terminal 2. Therefore, the excessive temperature rise around the electrode 12 is suppressed, and the reduction of mercury around the electrode 12 is suppressed, thereby Sputtering of the electron emissive material layer can be suppressed, and the effect of reducing the lamp voltage can be maintained compared with a lamp not provided with the power supply terminal 2 .

Specifically, the electron-emitting substance layer is formed on, for example, the inner surface of the electrode. The electron-emitting material layer contains, for example, rare earth elements. This is because, in the case of cold cathode discharge lamps, this helps to reduce the lamp voltage. Furthermore, it is more preferable that the rare earth element is any one or more elements selected from among lanthanum (La) and yttrium (Y).

Preferably, the electron-emitting material layer further contains silicon (Si), aluminum (Al), zirconium (Zr), boron (B), zinc (Zn), bismuth (Bi), phosphorus (P), and tin (Sn). Any one or more substances. In this case, the lamp voltage reduction effect can be further maintained.

Furthermore, a cesium (Cs) compound may be contained in the electron emissive material layer. In this case, the dark start characteristic of the lamp can be further improved. In addition, a cesium compound other than the electron-emitting substance layer may be additionally attached to the inner surface or the outer surface of the electrode 12 .

In addition, it is preferable to use any one or more of cesium sulfate, cesium aluminate, cesium niobate, cesium tungstate, cesium molybdate, and cesium chloride as the cesium compound.

The power supply terminal 2 is attached to the end of the glass container 6 .

Fig. 3 (a) is a perspective view when the power supply terminal 2 has not been attached to the glass container 6, Fig. 3 (b) is a perspective view after the power supply terminal 2 is attached to the glass container 6, and Fig. 3 (c) is used for illustration Figure 3 ( _d ) is _used to explain the inner surface of the main body 16 and the glass container 6. Diagram of the width _S3 of the space between the outer surfaces.

The power supply terminal 2 has a main body portion 16 that is inserted onto the outer periphery of the end portion of the glass container 6 and an elastic holding portion 18 extending from the main body portion 16 for holding the lead wire 10 (outer lead wire 10B). The power supply terminal 2 is formed by punching (sheet metal processing) of a metal plate such as stainless steel. In addition, when stainless steel is used, SUS304 is preferable from the viewpoint of corrosion resistance and elasticity. In addition, it is not limited to stainless steel, and other metal materials such as phosphor bronze, spring steel, and beryllium steel may be used.

The main body portion 16 has a cylindrical shape. Three clamp portions 20 are formed at equal intervals along the circumferential direction of the cylinder wall of the main body portion 16 . Each clip part 20 is comprised by the tongue piece inserted into the cylinder wall along the longitudinal direction, and these tongue pieces are formed by cutting in a substantially U-shape. As shown in the figure, the free end part of the tongue that is separated from the main body part is bent toward the inside into a "ㄑ" shape, starting from the base end part still connected with the main body part 16, and the whole part moves inward. Bending (plastic deformation). After the main body portion 16 constituted by the above structure is inserted onto the outer periphery of the end portion of the glass container 6, the top of the “ㄑ” character at the free end portion will abut against the outer periphery of the glass container 6, and the clip portion 20 as a whole will The glass container 6 is elastically deflected (elastically deformed) radially outward from the base end portion, and the glass container 6 is held by its restoring force. Accordingly, the glass container 6 is positioned in the main body portion 16 in a state substantially aligned with the axis of the cylindrical main body portion 16 .

In addition, needless to say, the shape, number, arrangement position, etc. of the clip part 20 are not limited to the above-mentioned form. In short, any structure can be used as long as the glass container 6 can be elastically supported in the main body portion 16 . For example, in the clip part 20 shown in FIG. The direction is close to the side of the central part of the tube, but the clip part is not limited to such a trend, and can also be the trend of the clip part 20a shown in Figure 4. The base end of the tongue is located in the direction of the tube axis of the glass container 6. Close to the side of the central part of the tube, the free end of the tongue is located on the side of the tube end of the glass container 6 in the direction of the tube axis; The clip parts 20a showing the directions are alternately combined, etc., and the clip parts of two directions coexist. In addition, the contact portion of the glass container 6 with the clip portion 20 is preferably closer to the central portion of the glass container 6 in the tube axis direction than the sealing portion of the glass container 6 . In this case, the power supply terminal 2 can be attached to the glass container 6 in a stable state while avoiding the sealing part whose shape tends to become unstable. In addition, it is preferable that a gap is 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 colliding with the main body portion 16 during operations such as transferring the power supply terminal 2 . Furthermore, as shown in FIG. 3(c), it is preferable that the gap _S1 along the tongue extending direction of the free end portion is equal to or greater than 0.1 [mm]. Furthermore, it is more preferable that the gap _S1 is within a range of 0.2 [mm] or more and 1.0 [mm] or less. In addition, as shown in FIG. 3( d ), it is more preferable that the gap _S2 on the side of the end in the tongue extending direction of the free end portion is equal to or greater than 0.2 [mm]. Furthermore, it is more preferable that the gap _S2 is in the range of 0.3 [mm] or more and 1.0 [mm] or less.

In addition, it is preferable that the width _S3 of the gap between the inner surface of the main body portion 16 and the outer surface of the glass container 6 is equal to or greater than 0.1 [mm]. In this case, the glass container 6 is easily inserted into the main body portion 16 . Furthermore, it is more preferable that the width _S3 of the gap between the inner surface of the main body 16 and the outer surface of the glass container 6 is within a range from 0.1 [mm] to 0.5 [mm]. Furthermore, it is more preferable that the width S ₃ is within a range of not less than 0.1 [mm] and not more than 0.3 [mm].

Two elongated rectangular elastic pieces 22 , 24 extending from the main body 16 are provided facing each other, and abutting portions 26 , 28 are further extended from the ends of the elastic pieces 22 , 24 .

The elastic pieces 22 and 24 are based on the base end, and the free end is bent in a direction close to the tube axis.

The abutting portions 26, 28 have arc-shaped cross-sections, and the inner peripheral surfaces 26A, 28A, which directly abut against the outer peripheral surface of the lead wire 10, are formed in a shape suitable for the shape of the outer peripheral surface of the lead wire 10, Surface contact is made with the outer peripheral surface of the lead wire 10 .

In addition, when the lead wire 10 has not been inserted between the two contact portions 26, 28, the contact portions 26A, 28A exist closer to the virtual outer peripheral surface of the lead wire 10 (outer lead wire 10B) indicated by the single-dot chain line. Radially inward position.

After the power supply terminal 2 configured as above is inserted onto the cold cathode fluorescent lamp 4 from the main body 16 side, the main body 16 is positioned relative to the glass container 6 in the radial direction by utilizing the function of the clip portion 20 as described above. . In addition, the elastic clamping portion 18 expands outward in the radial direction of the lead wire 10 as the lead wire 10 (outer lead wire 10B) is inserted, and clamps the lead wire 10 by its restoring force. Thus, the lead wire 10 is electrically connected to the elastic clamping portion 18 , and further the lead wire 10 is electrically connected to the main body portion 16 . Furthermore, the inside of the elastic pieces 22 and 24 also functions as a guide member for guiding the lead wire 10 toward the abutting portions 26 and 28 , so that the leading end of the lead wire 10 can be smoothly inserted between the abutting portions 26 and 28 .

In this way, as long as the lead wire 10 is inserted into the direction of its axis relative to the elastic clamping portion 18, the electrical connection can be realized, therefore, excessive force will not be applied to the lead wire 10 (the force in the direction perpendicular to the axis of the lead wire 10 ). Accordingly, damage to the portion of the glass container 6 for holding the lead wire 10 can be prevented. In addition, even if a force is applied to the power supply terminal 2 in the tube axis direction of the glass container 6, only the elastic holding part 18 (contact part 26, 28) will slide in the tube axis direction, so as long as it returns to its original position, it can maintain electrical connection status.

In addition, the pressing force on the external lead wire 10B generated by the abutting parts 26 and 28 has nothing to do with the contact area, as long as it is at least 100 [gf] or more, and the lamp current flowing at the time of lighting is 4 [mA] to 18 [mA ], it has been confirmed that a good electrical connection can be achieved for cold cathode discharge lamps of the left and right. Since it has nothing to do with the contact area, the contact form between the abutting portion and the external lead is applicable to the power supply terminals of all the embodiments described later, regardless of whether it is point contact, line contact, or surface contact. In this example, the pressing force (restoring force) can be appropriately adjusted by changing the material, shape (length, cross section) of the elastic pieces 24 and 22, and the like.

Here, the length L (length along the tube axis of the glass container 6 ) of the elastic clamping portion 18 shown in FIG. 2 is preferably within a range of 1.5 [mm] to 7 [mm].

In addition, when any of the abutting portions 26 and 28 is out of contact with the lead wire 10 for some reason, the lead wire 10 becomes a so-called cantilever beam whose fixed end is the sealing portion of the glass container 6 . It has been found through experiments that in this case, if the bending moment of the lead 10 at the fixed end is 1.5 [kgf·mm] or less, the lead 10 (outer lead 10B) does not undergo plastic deformation. However, in this experiment, an external lead made of Ni (nickel) and having a diameter of 0.6 [mm] was used. In addition, the diameter of the external lead 10B is not limited to 0.6 [mm], and may be, for example, 0.8 [mm] as in the above-mentioned embodiment.

Furthermore, as shown by the two-dot chain line in FIG. 3 , guide members 23, 25 may also be provided for guiding the lead wire 10 (outer lead wire 10B) toward the abutment when the power supply terminal 2 is attached to the glass container 6. The joints 26, 28 are guided. The guide members 23 , 25 are present between the outer circumferential elastic pieces 22 , 24 of the main body 16 , and their distal ends extend from the cylindrical wall of the main body 16 toward each other.

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

5 is a view showing a part of the elastic piece 22 corresponding to one contact portion 26 in the power supply terminal 2 provided with a stopper, (a) shows a front view, and (b) shows a section AA in (a) , (c) represents the right side view. Among them, the two-dot chain line indicates the external lead 10B.

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

As a result, as long as the power supply terminal 2 is externally inserted into the cold cathode fluorescent lamp 4 to the extent that the top end of the external lead wire 10B abuts against the stopper 30, the power supply terminal 2 can be positioned in the direction of the tube axis relative to the cold cathode fluorescent lamp 4. achieve relative positioning. In addition, not only a stopper may be provided on the contact portion 26 but also a stopper may be provided on the contact portion 28 .

In addition, in the above-mentioned example, the elastic clamping portion 18 is composed of two elastic clamping pieces 22, 24 and the abutting portions 26, 28 respectively arranged on the upper surfaces thereof, but the elastic clamping pieces constituting the elastic clamping portion The number of parts is not limited to two, but may be three or more. If the number is increased, the number of contact points with the lead wires will increase, so electrical connection can be realized more reliably. In addition, regardless of the number, it is preferable to arrange the elastic clamping pieces at equal intervals in the circumferential direction of the main body.

(Modification 1)

FIG. 6 is a diagram showing a modified example of the power supply terminal 2 of the first embodiment. However, in FIG. 6 , the same reference numerals are assigned to the same components as those of the power supply terminal 2 described above, and description thereof will be omitted.

(1) In the power supply terminal 2 of FIG. 3 , the elastic pieces 22 and 24 are made in a straight shape, while the elastic pieces 32 and 34 shown in FIG. 6( a ) are examples of curved shapes.

(2) FIG. 6( b ) shows a modified example of the abutting portion, and is a view viewed from the tube axis direction in a state where the power supply terminal is attached to the cold cathode fluorescent lamp. The cross-sectional shape is different from that of the abutting portions 26 and 28 ( FIGS. 2 and 3 ), and the cross-sectional shape of the abutting portions 36 and 38 shown in FIG. 6( b ) adopts the shape of the illustrated example. Thereby, even if it is a thin lead wire (outer lead wire), the shape as a contact part can be ensured.

(Modification 2)

FIG. 7 is a diagram showing a modified example of the power supply terminal 2 of the first embodiment. Fig. 7(a) and Fig. 7(c) are views viewed from the direction of the tube axis in a state where the power supply terminal is attached to the cold cathode fluorescent lamp. 7( b ) is a perspective view of the top portion of the power supply terminal 2 shown in FIG. 7( a ), and FIG. 7( d ) is a perspective view of the top portion of the power supply terminal 2 shown in FIG. 7( c ). However, in FIG. 7 , the same components as those of the above-mentioned power supply terminal 2 are given the same reference numerals, and description thereof will be omitted.

The power supply terminal 2 shown in FIG. 7 adopts a structure in which the abutting portion is crimped on the lead wire, so as to ensure the electrical connection more reliably.

The abutting portions 40 and 42 shown in FIG. 7( a ) and FIG. 7( b ) are examples in which the two abutting portions have different cross-sectional shapes. In addition, by crimping the part of the abutting portion 40 that is not in contact with the lead wire 10 in the direction of the arrow shown in FIG.

The abutting portions 44 and 46 shown in FIG. 7( c ) and FIG. 7( d ) are examples in which a left-right asymmetrical cross-sectional shape is adopted. In addition, by crimping the portions of the abutting portions 44, 46 that are not in contact with the lead wire 10 in the direction of the arrow shown in FIG. .

(second embodiment)

FIG. 8 shows power supply terminals 48 and 53 of the second embodiment. The power supply terminals 48 and 53 of the second embodiment differ from those of the first embodiment in the structure of the elastic clamping portion. However, in FIG. 8 , the same components as those of the above-mentioned power supply terminal 2 are assigned the same reference numerals, and description thereof will be omitted.

The power supply terminal 48 shown in FIG. 8( a ) has a rectangular connecting portion 50 extending from the cylinder wall of the main body 16 in parallel with its central axis 16A and bent at a right angle in the middle, and an extension end provided on the connecting portion 50 . The upper elastic clamping part 52. The elastic clamping portion 52 has a base portion 52A and a pair of elastic piece portions 52B, 52C extending from the base portion 52A, wherein the base portion 52A is a square plate member perpendicular to the central axis 16A.

Each of the elastic pieces 52B, 52C is made into a rectangle extending from opposite sides of the base 52 toward the main body 16 . The elastic piece parts 52B and 52C are bent inward (toward the central axis 16A) in a "ㄑ" shape, and the lead wire 10 is elastically sandwiched between the tops of the bent parts (FIGS. 1 and 2). In addition, in this example, 52 A of base parts perform the same function as the above-mentioned stopper 30 (FIG. 5).

In the power supply terminal 48 constituted as described above, the external lead wire 10B is in point contact with the elastic pieces 52B and 52C. Therefore, even if the main body portion 16 is slightly inclined toward the glass container 6 ( FIG. There is effective escape between the tops, and it is not easy to apply excessive force to the external lead 10B.

In addition, since the insertion and detachment performance of the elastic clamping portion 52 and the lead wire 10B is excellent, the detachability of the power supply terminal 48 on the glass container 6 is improved.

The elastic holding portion 54 of the power supply terminal 53 shown in FIG. 8( b ) has basically the same structure as the above-mentioned elastic holding portion 52 . That is, it consists of a pair of elastic piece part 54B, 54C extended from 54 A of base parts. It is characterized in that, including the connecting portion 56 , one strip-shaped portion extending from the main body portion 16 is formed by bending at a predetermined position in the longitudinal direction thereof. Therefore, in the power supply terminal 53 , the elastic clamping portion 54 itself can be configured with less material, and overall weight reduction can be achieved.

In addition, the point that the external lead 10B is easily inserted into the elastic holding portion 54 is the same as that of the elastic holding portion 52 ( FIG. 8( a )). On the other hand, the external lead 10B has a structure that is difficult to pull out from the elastic holding portion 54 . When an attempt is made to pull the external lead 10B out of the elastic holding portion 54 , the connecting portion 56 bends inward (towards the central axis 16A). As a result, the elastic piece portion 54C also moves inward in the same manner and presses the external lead 10B, increasing the frictional force between the elastic piece portion 54C and the external lead 10B. Thus, the power supply terminal 53 is suitable for use where detachment is not required once attached to the glass container 6 .

In addition, also in this example, the base part 54A performs the same function as the above-mentioned stopper 30 (FIG. 5).

(third embodiment)

FIG. 9 shows the power supply terminal 58 of the third embodiment. The power supply terminal of the third embodiment also differs in the structure of the elastic clamping portion from that of the first embodiment. In each figure of Fig.9 (a)-(d), what is depicted on the right side is only the right side view of the elastic clamping part. However, in FIG. 9 , the same components as those of the above-mentioned power supply terminal 2 are given the same reference numerals, and description thereof will be omitted.

Both the abutting portions 60 and 64 shown in FIG. 9( a ) and FIG. 9( b ) have arc-shaped cross sections. The elastic clamping portion 60 is an example of a parallel shape extending from both ends of the arc to the terminal end, and the elastic clamping portion 64 is an example of a curved shape away from each other from the two ends of the arc to the terminal end.

The elastic clamping portions 60, 64 are connected to the main body portion 16 by connecting portions 62, 66, respectively.

The elastic clamping parts 68 and 72 shown in Fig. 9(c) and Fig. 9(d) adopt a structure in which the middle part of the cross-section of the overall "U" shape expands into an arc shape.

The elastic clamping portion 68 is an example of a parallel shape extending from both ends of the arc to the terminal end, and the elastic clamping portion 72 is an example of a curved shape away from each other from the two ends of the arc to the terminal end.

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

In addition, the arc radius of the arc-shaped portion is set to be equal to the radius of the lead wire 10 (outer lead wire 10B), thereby making the circles of the elastic clamping parts 60, 64, 68, 72 The inner surface of the arc-shaped portion is in surface contact with the outer surface of the lead wire 10 . In addition, in a state where the lead wire 10 has not been inserted, the arc-shaped portion is plastically deformed and shrunk as a whole. Therefore, after the lead wire 10 is inserted, the elastic clamping portions 60 , 64 , 68 , 72 are elastically deformed, expand radially outward of the lead wire 10 , and clamp the lead wire 10 by its restoring force.

(fourth embodiment)

FIG. 10 shows a power supply terminal 80 according to the fourth embodiment. Fig. 10(a) shows a front view in a state after the power supply terminal 80 is attached to the end of the CCFL 4, and Fig. 10(b) shows a right side view in the same state.

The main body of the power supply terminal 80 has basically the same structure as the main body 16 of the power supply terminal 2 according to the first embodiment, and therefore the same reference numerals are used to omit description thereof.

The elastic clamping portion 82 is composed of a pair of elastic pieces 84 , 86 and abutting portions 88 , 90 respectively extending from the elastic pieces 84 , 86 .

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

Tapered threads 98 are provided on the outer surface of the conical portion 96 .

In addition, the power supply terminal 80 has a ring nut 100 threadedly engaged with the tapered thread 98 .

In the state where the power supply terminal 80 constituted by the above structure is inserted into the cold cathode fluorescent lamp 4 (the external lead wire 10B is inserted between the abutting parts 88 and 90), after the ring nut 100 is tightened, the elastic pieces 84, 86 as a whole deforms inward, and the two abutting portions 88 and 90 come into contact with the external lead 10B. Furthermore, by tightening the ring nut 100, the two abutting portions 88 and 90 are pressed against the external lead 10B, thereby sandwiching the external lead 10B.

In addition, in the state where the ring nut 100 has not been screwed together, the elastic restoring force of the elastic piece parts 84 and 86 can be used to clamp the external lead 10B, or it can also be adopted when the ring nut 100 is screwed together. 100 is threaded and tightened to begin to clamp the structure of the external lead 10B.

In addition, in the above-mentioned example, a conical portion having two slits is used, but the number of slits provided is not limited to two, and may be three or more.

Furthermore, a slit continuous with the slit formed in the conical portion may be formed on the side of the main body. For example, in Fig. 10(a), a pair of slits 102 as shown by single dotted line can also be opened at the opposing positions of the cylinder wall of the main body 16 (the other slit cannot be seen in this view). . Thus, the holding force of the main body portion 16 to the glass container 6 can also be adjusted by the tightening degree of the ring nut 100 . This is particularly advantageous when the power supply terminal 80 is applied to cold-cathode fluorescent lamps of various sizes in which the aperture diameters of the glass containers 6 are different.

(fifth embodiment)

FIG. 11 shows a power supply terminal 110 according to the fifth embodiment. The power supply terminal 110 of the fifth embodiment differs from the first embodiment in the structure of its main body. However, in FIG. 11 , the same reference numerals are attached to the same components as those of the power supply terminal 2 described above, and description thereof will be omitted.

The main body part 112 of the power supply terminal 110 adopts the structure that, starting from one end of the cylindrical body, a plurality of (six in this example) are arranged at equal intervals along the central axis in the circumferential direction in the direction of the central axis. Up to the slit 114 of the specified depth, from one end of the cylindrical body 116 that has never opened the slit 114 (the slit 114 fails to reach), a plurality of (six in this example) are extended. Rectangular elastic sheet 118 .

Each elastic piece 118 is bent inward as a whole with the vicinity of the base end on one side of the cylindrical body 116 as a base point, and then partially bent inward in a "ㄑ" shape near the free end. The reason why it is bent into a "ㄑ" shape in this way is that when the power supply terminal 110 is inserted into the cold cathode fluorescent lamp, the top corner of the elastic piece 118 will not scratch the glass container 6, and it is easy to insert.

Here, the diameter of the imaginary cylinder inscribed with the tops protruding to the inner side of the above-mentioned "ㄑ"-shaped bending part of each elastic piece 118 (on the surface side of the glass container 6) is set to be shorter than the outer diameter of the glass container 6.

FIG. 12 is a diagram showing states before and after the power supply terminal 110 is attached to the cold cathode fluorescent lamp 4 .

After the power supply terminal 110 constituted by the above structure is inserted into the end of the cold cathode fluorescent lamp 4, the tops of the "ㄑ" characters of each elastic piece 118 will be abutted against the outer periphery of the glass container 6, and the entire elastic piece 118 is then described as described above. The base end portion serves as a base point, elastically deflects (elastically deforms) outward in the radial direction of the glass container 6 , and holds the glass container 6 by its restoring force. Thereby, the glass container 6 is positioned in the main body part 112 in a state substantially coincident with the axis of the cylindrical body part 116 . In addition, needless to say, the shape, number, arrangement position, etc. of the elastic pieces 118 (slits 114 ) are not limited to the above-mentioned forms. In short, any structure can be used as long as the glass vessel 6 can be elastically supported in the main body portion 112 .

(sixth embodiment)

FIG. 13 shows a power supply terminal 160 according to the sixth embodiment. FIG. 13( a ) and FIG. 13( b ) respectively show a front view and a right side view of the power supply terminal 160 .

The main body of the power supply terminal 160 has basically the same structure as the main body 16 of the power supply terminal 2 according to the first embodiment, so the same reference numerals are used to omit description thereof.

The elastic clamping portion 162 provided on the main body 16 is formed by punching an elastic metal disc (such as a stainless steel plate), and its peripheral part is connected to the end of the main body 16 by laser welding or the like. join.

The central portion of the disk-shaped elastic clamping portion 162 is punched into the shape shown in FIG. , 162C. The tip portions (free ends) of the tongue pieces 162A, 162B, and 162C have sharp cut surfaces punched and cut. In addition, needless to repeat, the tongue pieces 162A, 162B, 162C are elastic pieces.

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

FIG. 13( c ) is a front view showing a state in which the power supply terminal 160 is fitted and attached to the cold cathode fluorescent lamp 2 from the side of the main body 160 . Wherein, what is depicted in FIG. 13( c ) is a cross-sectional view of the elastic clamping portion 162 cut at a position corresponding to the line B-B shown in FIG. 13( b ).

After the power supply terminal 160 is inserted into the cold cathode fluorescent lamp 2 from the side of the main body 160, the tongue pieces 162A, 162B, and 162C are bent with their base ends as the base point, and the external lead wire 10B is moved from three directions by the restoring force. Keep. In addition, since the tip portions of the tongue pieces 162A, 162B, and 162C, that is, the portions contacting the external lead 10B are sharp edges, the tip portions are sunk into the outer peripheral surface of the external lead 10B.

In this way, the tongue pieces 162A, 162B, and 162C are sunk into the outer peripheral surface of the external lead 10B, and the contact area between the abutting portion and the external lead 10B is increased. At the same time, oxidation of the contact portion can be prevented, so that the improvement can be improved. reliability of electrical connections.

In addition, needless to say, the number and shape of the tongue pieces (elastic pieces) are not limited to the above-mentioned manner.

(seventh embodiment)

FIG. 14 shows a power supply terminal 180 according to the seventh embodiment. FIG. 14( a ) and FIG. 14( b ) show a front view and a right side view of the power supply terminal 180 , respectively.

The main body of the power supply terminal 180 has basically the same structure as the main body 16 of the power supply terminal 2 according to the first embodiment, and therefore the same reference numerals are used to omit description thereof.

The elastic clamping part 162 provided on the main body part 16 is formed into a shallow cup shape by punching a metal disc (for example, a steel plate for a spring), the bottom of which is punched and cut into a predetermined shape, and the peripheral part of the bottom is processed by laser Welding or the like is joined to the end portion of the main body portion 16 . The elastic clamping portion 162 is a so-called tapping nut, and has a structure in which a pair of teeth 182A, 182B protrude toward each other on the bottom. The facing distance d3 between the tooth portions 182A, 182B shown in FIG. 14( b ) is set to be shorter than the outer diameter of the outer lead 10B.

After the power supply terminal 180 having the above structure is inserted into the cold cathode fluorescent lamp 2 while being rotated in the direction of the arrow C from the main body 160 side as shown in FIG. Threads are formed on the outer peripheral surface. In addition, the tooth portions 182A and 182B are somewhat deflected with respect to their base ends, and the external lead 10B is held by the restoring force thereof. The top ends of the tooth portions 182A, 182B sink into the formed thread grooves, so the contact area between the top ends of the tooth portions 182A, 182B and the external lead 10B increases, and at the same time, oxidation of the contact portion can be prevented, thereby improving electrical resistance. connection reliability.

In addition, even if the power supply terminal 160 ( FIG. 13 ) of the sixth embodiment is tried to be pulled out from the cold cathode fluorescent lamp 2 , it is difficult to pull out because the tongue pieces 162A, 162B, and 162C are caught in the external lead 10B. However, since the power supply terminal 180 of the seventh embodiment can be removed by rotating it in the direction opposite to the arrow C in FIG. 14( c ), it can be reused.

(eighth embodiment)

FIG. 15 is a perspective view showing a schematic configuration of a direct-type backlight unit 300 including cold cathode fluorescent lamps 4 as light sources. In addition, FIG. 15 is a cutaway view of a diffusion plate 308 , a diffusion sheet 310 , and a lens sheet 312 described later.

The backlight unit 300 has a rectangular reflector 302 and a cover 306 composed of side plates 304 surrounding the reflector 302 . Both the reflector 302 and the side plate 304 are formed by depositing aluminum or the like on one main surface (the inner surface when assembled into the cover 306 ) of a plate made of PET (polyethylene terephthalate) resin. formed reflective film (not shown).

Inside the housing 306 are stored a plurality of (eight in this example) cold cathode fluorescent lamps 4 as light sources, which are parallel to the long sides of the reflector 302 and arranged at equal intervals in the short side direction.

In addition, a diffusion plate 308 , a diffusion sheet 310 and a lens sheet 312 are provided at the opening of the outer cover 306 .

The mounting structure of the cold cathode fluorescent lamps 4 on the housing 306 in the backlight unit 300 will be described with reference to FIG. 16 . In addition, in the illustrated example, the power supply terminal 2 of the first embodiment is used, but any one of the power supply terminals in other second to fifth embodiments including modified examples may be used.

On the upper surface of the reflection plate 302, a connector 314 formed by bending an elastic metal plate made of, for example, phosphor bronze is erected. By fitting the main body 16 of the power supply terminal 2 attached to both ends of the cold cathode fluorescent lamp 4 into the corresponding connector 314, the cold cathode fluorescent lamp 4 can be attached to the housing 306 in a one-touch manner. Accordingly, the power supply terminal 2 is electrically connected to the connector 314 , and electric energy from a lighting circuit (not shown) is supplied to the cold cathode fluorescent lamp 4 via the connector 314 and the power supply terminal 2 .

(Problems and Solutions When Mounting a Cold Cathode Fluorescent Lamp Attached to a Power Supply Terminal to a Backlight Unit)

(1) As long as the main body 16 of the power supply terminal 2 is inserted through the opening of the connector 314, the cold-cathode fluorescent lamp 4 can be attached. Therefore, the cold-cathode fluorescent lamp 4 may deviate from its tube axis direction. Also, for example, if a cold cathode fluorescent lamp contains a glass vessel with an elliptical cross-section, the mounting orientation around the tube axis will be an issue. This is because, in the case of an elliptical cross-section, in order to effectively release light from the backlight unit, it is preferable that its long diameter or short diameter be parallel to the reflector 302, but if misalignment occurs around the tube axis, the light will release efficiency will decrease.

17 and 18 are diagrams showing the power supply terminal 120 and the connector 130. The power supply terminal 120 and the connector 130 are designed to prevent misalignment in the direction of the tube axis and around the tube axis when the cold cathode fluorescent lamp 4 is attached to the connector. structure. In the power supply terminal 120 , components substantially the same as those of the power supply terminal 2 ( FIG. 2 and FIG. 3 ) in the first embodiment are given the same reference numerals, and description thereof will be omitted.

An engaging hole 124 is defined on a cylinder wall of the main body portion 122 of the power supply terminal 110 .

The connector 130 has substantially the same structure as the connector 214 described above. That is, the connector 130 is formed by punching an elongated plate (phosphor bronze plate) made of phosphor bronze, and it consists of a pair of opposing clamping pieces 130A, 130B having arc portions and connecting the two. The connecting portion 130C constitutes. In addition, an engaging protrusion 130D protruding inward is provided on the arc-shaped portion of one holding piece 130A. In addition, it is preferable that the height of the engaging protrusion 130D from the inner surface of the arc-shaped portion is substantially the same as the thickness of the cylinder wall of the main body portion 122 of the power supply terminal 124 .

With regard to the power supply terminal 120 and the connector 130 constituted by the above structure, as long as the power supply terminal 120 is inserted into the connector 130 in such a manner that the engaging hole 124 and the engaging protrusion 130D are engaged together, the cold cathode can be prevented. The fluorescent lamp 4 is misaligned in the tube axis direction and around the tube axis with respect to the connector 130 .

(2) The outer circumference of the main body of the power supply terminal described so far is a cylindrical surface as a whole. Therefore, when the cold cathode fluorescent lamps to which the power supply terminals are attached are arranged on a flat console and installed on the backlight unit, There will be a problem that it is easy to roll on the console and difficult to operate.

FIG. 19 is a diagram showing a power supply terminal 140 having a structure that does not easily roll even if it is placed on a flat surface. However, in FIG. 19 , the same reference numerals are attached to the same components as those of the above-mentioned power supply terminal 120 ( FIG. 17 , FIG. 18 ), and description thereof will be omitted.

In the power supply terminal 140 , a part of the outer peripheral surface of the main body portion 142 is formed as a flat surface 144 . In this way, by providing the flat surface 144 on the main body portion 142, the cold cathode fluorescent lamp with such a power supply terminal becomes less likely to roll on the flat surface. In addition, in this case, it is preferable to adjust the installation angle (the angle around the tube axis) of the two power supply terminals 140 so that the two flat surfaces 144 of the power supply terminals 140 provided at both ends of the cold cathode fluorescent lamp 4 are positioned at on the same plane.

In the lower part of FIG. 19 , a preferred structure of the connector 150 in the case where the power supply terminal 140 having the above-mentioned structure is used is shown. However, in FIG. 19 , the same reference numerals are assigned to the same components as those of the above-mentioned power supply terminal 130 ( FIG. 17 , FIG. 18 ), and description thereof will be omitted.

A flat portion 152A adapted to the flat surface 144 of the power supply terminal 140 is provided on one clamping piece 152 of the connector 150 . In addition, as shown in FIG. 20 , as long as the power supply terminal 140 is fitted into the connector 130 so that the flat surface 144 engages with the flat portion 152A, it is possible to prevent the cold cathode fluorescent lamp 4 from moving around the tube axis with respect to the connector 130 . Misalignment occurs.

(3) In the power supply terminal 2 of the first embodiment ( FIG. 3 ), the power supply terminal of the second embodiment ( FIG. 8 ), the power supply terminal of the third embodiment ( FIG. 9 ), and the power supply terminal 80 of the fourth embodiment ( 10 ) and the power supply terminal 110 ( FIG. 11 , FIG. 12 ) of the fifth embodiment, the elastic clamping portion (such as the elastic clamping portion 18 in the power supply terminal 2 of the first embodiment) protrudes from the main body 16 Therefore, during operations such as installation to the backlight unit, the protruding portion will collide with the console or other cold-cathode fluorescent lamps, causing damage to the glass container 6 portion supporting the lead wire 10 .

FIG. 21 is a diagram showing a power supply terminal 190 having a structure capable of coping with such a problem. In the power supply terminal 190 , components that are substantially the same as those of the power supply terminal 2 ( FIG. 2 and FIG. 3 ) in the first embodiment are given the same reference numerals, and description thereof will be omitted.

The power supply terminal 190 adopts a structure in which protective parts 192 and 194 extend from between the elastic pieces 22 and 24 at the ends of the main body 16, and the protective parts 192 and 194 surround the external lead 10B from a direction perpendicular to the tube axis.

In this way, by providing the protection portions 192 and 194 surrounding the external lead 10B, the external lead 10B can be protected from external damage as much as possible.

In addition, in the above example, the protection parts 192 and 194 are extended from the main body part 16, but it is also possible to adopt a method in which the protection parts are separated from the main body part 16 and joined to the main body part 16. . FIG. 22 shows a power supply terminal 196 employing such a structure.

Among the power supply terminals 196 , components that are substantially the same as those of the power supply terminal 2 ( FIG. 2 and FIG. 3 ) in the first embodiment are given the same reference numerals, and description thereof will be omitted.

The power supply terminal 196 has a protection member 198 further added to the structure of the power supply terminal 2 according to the first embodiment.

The protective member 198 has a cylindrical shape, and one end portion is partially inserted onto the main body 16, and joined to the main body 16 by laser welding or the like. In this way, by providing the protective member 198 surrounding the external lead 10B, the external lead 10B can be protected from external damage as much as possible.

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

One end of the protective member 198 is provided with notches 198A, 198B shown in the illustrated example.

On the other hand, the connector 200 is provided with engaging protrusions 130E, 130F for engaging with the notches 198A, 198B when the power supply terminal 196 is inserted. In addition, in the socket 200 shown in FIG. 22 , the components that are basically the same as those in the socket 130 shown in FIG. 17 are denoted by the same reference numerals, and description thereof will be omitted.

The engaging protrusions 130E and 130F are provided at end portions of the extending portion 130D extending from the coupling portion 130C in the tube axial direction.

In addition, engaging holes (not shown) may be used instead of the notches 198A and 198B. In addition, the engaging protrusions 130E, 130F may be provided separately from the connector. Furthermore, the number of notches 198A, 198B and engaging holes is not limited to two, and may be one. Alternatively, there may be three or more. The number of engaging protrusions may be appropriately changed according to the number of notches and engaging holes.

(ninth embodiment)

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. As shown in FIG.

The liquid crystal screen unit 322 is a well-known device including a liquid crystal panel (color filter substrate, liquid crystal, TFT substrate, etc.) (not shown), a driver module, etc. (not shown), and forms a color image based on an image signal from the outside.

The lighting circuit 324 turns on the cold cathode fluorescent lamps 4 ( FIGS. 15 and 16 ) inside the backlight unit 300 . In addition, the cold cathode fluorescent lamp 4 operates at a lighting frequency of 40 [kHz] to 100 [kHz] and a lamp current of 4 [mA] to 18 [mA].

As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to the said embodiment, of course, For example, the following embodiment can also be employ|adopted.

(1) In the above embodiment, the cold cathode fluorescent lamp was used as an example for the cold cathode discharge lamp, but the present invention is not limited to the fluorescent lamp, and can be applied to the cold cathode ultraviolet lamp. That is, a cold-cathode ultraviolet lamp is formed by removing the phosphor film (no phosphor film is formed) from the structure of the cold-cathode fluorescent lamp of the above-mentioned embodiment, and the present invention can also be applied to such a structure. The ultraviolet lamp is used to irradiate ultraviolet rays to an object to be irradiated, to sterilize the object to be irradiated, and the like.

(2) In the above embodiment, the electrical connection with the lead wire (external lead wire) is realized only by the elastic restoring force of the elastic clamping part in the power supply terminal, but in order to ensure the connection performance more reliably, the lead wire (outer lead wire) may also be The abutting portion is joined by laser welding, resistance welding, arc welding, or the like.

(3) In the above-mentioned first to fifth embodiments (FIGS. 1 to 12), the power supply terminal in which the main body part and the elastic clamping part are integrated is produced by punching a single metal plate, but it may be, for example, After the main body part and the elastic clamping part are manufactured separately, the main body part and the elastic clamping part are joined together so that the two are integrated.

(4) About glass containers

The glass used for glass containers may have the following composition in terms of oxides, namely: SiO ₂ is 60 [wt%] to 75 [wt%], Al ₂ O ₃ is 1 [wt%] to 5 [wt%] %], Li ₂ O is 0[wt%]~5[wt%], K ₂ O is 3[wt%]~11[wt%], Na ₂ O is 3[wt%]~12[wt%] , CaO is 0[wt%]~9[wt%], MgO is 0[wt%]~9[wt%], SrO is 0[wt%]~12[wt%], BaO is 0[wt%] ~12 [wt%]. In this case, it does not contain lead components, which can provide cold cathode fluorescent lamps that are beneficial to the environment. Furthermore, it is preferable that the glass used for the glass container has the following composition in terms of oxides, namely: SiO ₂ is 60 [wt%] to 75 [wt%], Al ₂ O ₃ is 1 [wt%] to 5[wt%], B ₂ O ₃ is 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%]~12[wt%], CaO is 0[wt%]~9[wt%], MgO is 0[wt%]~9[wt%], SrO 0[wt%]-12[wt%], BaO is 0[wt%]-12[wt%].

In addition, the glass used for the glass container may have the following composition in terms of oxides, that is, SiO ₂ is 60 [wt%] to 75 [wt%], Al ₂ O ₃ is 1 [wt%] to 5 [wt%], Li ₂ O is 0.5[wt%]～5[wt%], K ₂ O is 3[wt%]～7[wt%], Na ₂ O is 5[wt%]～12[wt%] %], CaO is 1[wt%]～7[wt%], MgO is 1[wt%]～7[wt%], SrO is 0[wt%]～5[wt%], BaO is 7[wt%] %] ~ 12 [wt%].

In this case, the lamp is easy to process, and it does not contain a lead component, enabling the provision of a cold cathode fluorescent lamp which is beneficial to the environment.

Furthermore, the glass used for the glass container may have the following composition in terms of oxides, that is, SiO ₂ is 65 [wt%] to 75 [wt%], Al ₂ O ₃ is 1 [wt%] to 5 [wt%], B ₂ O ₃ is 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%]~12[wt%], CaO is 2[wt%]~7[wt%], MgO is 2.1[wt%]~7[wt%], SrO is 0[wt%]-0.9[wt%], BaO is 7.1[wt%]-12[wt%]. In this case, it does not contain a lead component, has electrical insulating properties suitable for lighting use, and does not easily cause devitrification. Furthermore, it is more preferable that the glass used for the glass container has the following composition in terms of oxides, that is, SiO ₂ is 65 [wt%] to 75 [wt%], Al ₂ O ₃ is 1 [wt%] ~3[wt%], B ₂ O ₃ is 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%]~10[wt%], CaO is 3[wt%]~6[wt%], MgO is 3[wt%]~6[wt%], SrO is 0 [wt%] to 0.9 [wt%], and BaO is 7.1 [wt%] to 10[wt%].

(5) Regarding the phosphor of the phosphor layer

(5-1) About UV absorption

For example, in recent years, along with the increase in the size of liquid crystal color televisions, polycarbonate having high dimensional stability has begun to be used for a diffusion plate that closes the opening of a backlight unit. This polycarbonate is easily degraded by ultraviolet rays with a wavelength of 313 [nm] emitted from mercury. In this case, it is preferable to use a phosphor capable of absorbing ultraviolet light having a wavelength of 313 [nm]. In addition, phosphors that can absorb ultraviolet rays with a wavelength of 313 [nm] include the following types.

(a) blue

Europium manganese activated barium strontium magnesium aluminate [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.

Such phosphors are, for example, europium-activated barium magnesium aluminate [BaMg ₂ Al ₁₆ O ₂₇ :Eu ²⁺ ], [BaMgAl ₁₀ O ₁₇ :Eu ²⁺ ] (abbreviated: BAM-B) or europium-activated barium Strontium magnesium aluminate [(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 unactivated magnesium gallate [MgGa ₂ O ₄ :Mn ²⁺ ] (referred to as: MGM)

Manganese activated cerium magnesium zinc aluminate [Ce(Mg, Zn)Al ₁₁ O ₁₉ :Mn ²⁺ ] (referred to as: CMZ)

Terbium activated cerium magnesium aluminate [CeMgAl ₁₁ O ₁₉ :Tb ³⁺ ] (abbreviation: CAT)

Barium strontium magnesium aluminate activated by europium manganese [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 preferably 0.4≤x≤0.5.

Such phosphors are, for example, barium magnesium aluminate activated by europium manganese [BaMg ₂ Al ₁₆ O ₂₇ :Eu ²⁺ , Mn ²⁺ ], [BaMgAl ₁₀ O ₁₇ :Eu ²⁺ , Mn ²⁺ ] (referred to as: BAM-G) or barium strontium magnesium aluminate activated by europium manganese [(Ba,Sr)Mg ₂ Al ₁₆ O ₂₇ :Eu ²⁺ ,Mn ²⁺ ], [(Ba,Sr)MgAl ₁₀ O ₁₇ :Eu ^{2 +} , Mn ²⁺ ] (abbreviated as: SBAM-G), etc.

(c) red

Europium-activated iridium phosphovanadate [Y(P,V)O ₄ :Eu ³⁺ ] (abbreviation: YPV)

Europium activated iridium vanadate [YVO ₄ :Eu ³⁺ ] (referred to as: YVO)

Europium-activated ethyl sulfone (Yttrium Oxysulfide) [Y ₂ O ₂ S:Eu ³⁺ ] (abbreviation: YOS)

·Manganese-activated magnesium hydrofluorogermanate [3.5MgO·0.5MgF ₂ ·GeO ₂ :Mn ⁴⁺ ] (referred to as: MFG)

Dysprosium-activated yttrium vanadate YVO ₄ :Dy ³⁺ ] (red and green light-emitting phosphors, abbreviated as: YDS)

In addition, phosphors of different compounds may be used in combination for one emission color. For example, only BAM-B (absorbing 313 [nm]) phosphors are used for blue, LAP (non-absorbing 313 [nm]) and BAM-G (absorbing 313 [nm]) phosphors are used for green, and red is used YOX (not absorbing at 313 [nm]) and YVO (absorbing at 313 [nm]) phosphors. In this case, by adjusting the phosphor absorbing at 313 [nm] to be more than 50% by weight in the total weight composition ratio as described above, it is possible to substantially prevent ultraviolet rays from leaking out of the glass bulb. Therefore, when the phosphor layer 105 contains a phosphor that absorbs ultraviolet rays of 313 [nm], it is possible to suppress the diffusion plate made of polycarbonate (PC) for blocking the opening of the backlight unit from being caused by ultraviolet rays. It is aged by irradiation and can maintain the characteristics as a backlight unit for a long time.

Here, the so-called "absorbing ultraviolet light at 313 [nm]" is defined as the excitation wavelength spectrum near 254 [nm] (the excitation wavelength spectrum refers to the excitation of phosphors to emit light while changing the wavelength, and the excitation wavelength and light emission are measured and mapped. When the intensity of the obtained spectrum) is defined as 100 [%], the intensity of the excitation wavelength spectrum of 313 [nm] is 80 [%] or more. That is, the phosphor that absorbs 313 [nm] ultraviolet rays refers to a phosphor that can absorb 313 [nm] ultraviolet rays and convert them into visible light.

(5-2) Regarding high color reproduction

In liquid crystal display devices represented by liquid crystal color televisions, along with the advancement of high color reproduction as a part of high image quality in recent years, cold cathode discharges are required to be used as light sources for the backlight units of the liquid crystal display devices. Lamps or external electrode discharge lamps expand their reproducible chromaticity range.

In response to such a request, for example, by using the following phosphors, the chromaticity range can be further expanded compared to the case of using the phosphors in the embodiment.

Specifically, in the CIE1931 chromaticity diagram, the chromaticity coordinate values of the phosphors used to achieve high color reproduction are located in a triangle that includes the chromaticity coordinate values of the three phosphors used in the embodiment. Within the coordinates that extend the range of color reproduction.

(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, it is also possible to use europium to activate strontium calcium barium chloroapatite [(Sr, Ca, Ba) ₁₀ (PO ₄ ) ₆ Cl ₂ :Eu ²⁺ ] (referred to as: SBCA), and the above-mentioned absorbing wavelength is SBAM-B with 313(nm) 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

In addition, as mentioned above, these phosphors can also absorb ultraviolet rays with a wavelength of 313 [nm], and besides the three types of 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

In addition, as mentioned above, these phosphors can also absorb ultraviolet rays with a wavelength of 313 [nm], and besides the three types of 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 obtained by measuring only the powder of each phosphor, and the color expressed by the powder of each phosphor varies depending on the measurement method (measurement principle) and the like. Degree coordinate values sometimes differ slightly from the published values above. For reference, the chromaticity coordinate values of the powders of the phosphors in the first embodiment described above are represented by YOX (x=0.644, y=0.353), LAP (x=0.351, y=0.585), BAM-B (x= 0.148, y=0.056).

Furthermore, the phosphors used to emit red, green, and blue lights are not limited to one kind for each wavelength, and a plurality of phosphors may be used in combination.

Here, the case where the phosphor layer is formed using the above-mentioned phosphor particles for high color reproduction will be described. Here, the evaluation is carried out in the following manner, that is, based on the area of the NTSC triangle (NTSC triangle) formed by connecting the chromaticity coordinate values of the three primary colors of the NTSC system in the CIE1931 chromaticity diagram, the color used for high color reproduction is obtained. The phosphor is the ratio of the area of a triangle formed by connecting three chromaticity coordinate values to the reference (hereinafter referred to as NTSC ratio).

For example, if you use BAM-B for blue, BAM-G for green, and YVO for red (Example 1), the NTSC ratio is 92[%], and if you use SCA for blue, BAM-G for green, and YVO for red ( Example 2), the NTSC ratio is 100[%], and if SCA is used for blue, BAM-G is used for green, and YOX is used for red (Example 3), the NTSC ratio is 95[%], which is similar to that of Example 1 and Example 2 Ratio, the brightness can be increased by 10[%].

In addition, the chromaticity coordinate values used in the evaluation here are values measured using a liquid crystal display device equipped with lamps, etc. Therefore, different combinations with color filters may result in a color reproduction range that is less than the above values. up and down.

Industrial Applicability

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

Claims (8)

1. A power supply terminal, mounted on the end of a cold cathode discharge lamp, the cold cathode discharge lamp has a tubular glass container and a lead wire sealed at the end of the glass container and extending outward along the tube axis direction, wherein ,have: a main body portion inserted on the outer periphery of the end portion of the glass container; and The elastic clamping portion is provided on the main body, and clamps the lead wire by elastic restoring force when the lead wire is inserted. 2. The power supply terminal according to claim 1, wherein, The elastic clamping portion includes: at least two elastic pieces extending from the main body, and an abutting portion provided on each top end of these elastic pieces and abutting against the outer periphery of the lead wire, In a state before the lead wire is inserted, the abutting part of the abutting part with the lead wire is located radially inward of the imaginary outer peripheral surface of the lead wire. 3. The power supply terminal according to claim 1, wherein, The main body is cylindrical, The elastic clamping part includes: a conical part extending from the main part and having at least two slits in the direction of the tube axis, and a conical part arranged at the top end of the conical part and connected to the lead wire The abutment part where the outer peripheral surface of the A taper thread is provided on a part of the outer surface of the cone portion, The power supply terminal further has a ring nut threadedly engaged with the tapered thread. 4. The power supply terminal according to claim 2 or 3, wherein The abutting portion of the abutting portion is formed in a shape suitable for the outer peripheral surface of the lead wire, and is in surface contact with the outer peripheral surface of the lead wire. 5. The power supply terminal according to any one of claims 2 to 4, wherein, In a 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] or more by the elastic restoring force. 6. A cold cathode discharge lamp with power supply terminals, It has a tubular glass container and a lead wire sealed at the end of the glass container and extends outward along the tube axis, and a power supply terminal is installed at the end of the glass container, wherein The power supply terminal is the power supply terminal described in any one of claims 1 to 5, The main body part is inserted on the outer periphery of the end part of the glass container, and the lead wire is inserted into the elastic clamping part. 7. A backlight unit, wherein, A cold-cathode discharge lamp with a power supply terminal according to claim 6 is used as a light source. 8. A liquid crystal display device, wherein: LCD screen; and The backlight unit according to claim 7 arranged on the back of the liquid crystal display screen.

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