JP2008091186A - Wiring connecting structure of cold-cathode tube for backlight of liquid crystal display panel, and terminal fitting used for it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiring connecting structure of cold-cathode tube for a backlight of a liquid crystal display panel capable of downsizing a connecting part and improving reliability, and a terminal fitting used for the same. <P>SOLUTION: The wiring connecting structure 1 of cold-cathode tube for the backlight of the liquid crystal display panel is provided with a cold-cathode tube 20 having a pin terminal 22, a terminal fitting 10 connected electrically to the pin terminal 22 of the cold-cathode tube 20, and a lead wire 30 having a conductor portion 31 electrically connected to the terminal fitting 10. The terminal fitting 10 comprises a cylindrical part 11 in which the pin terminal 22 of the cold-cathode tube 20 is inserted and a lead wire connecting part 13 which is formed so as to extend from the outer periphery face of the cylindrical part 11 and is electrically connected to the conductor portion 31 of the lead wire 30. By filling a solder part 50 inside the cylindrical part 11 in which the pin terminal 22 is inserted, the pin terminal 22 and the terminal fitting 10 are electrically connected. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wiring connection structure for supplying power to a cold cathode tube used as a light source for a backlight of a liquid crystal display panel, and a terminal fitting used therefor.

  A cold cathode tube used as a light source for a backlight of a liquid crystal display panel has pin terminals at both ends thereof. The conductor portion of the lead wire is electrically connected to the pin terminals at both ends. A high frequency voltage of 1 kV or higher is applied to the pin terminals at both ends of the cold cathode tube through a lead wire from a high frequency power source. Conventionally, electrical connection between a pin terminal and a conductor portion of a lead wire has been generally performed by solder bonding.

  By the way, in recent years, electrical and electronic devices equipped with a liquid crystal display panel have been required to be further reduced in size and thickness. Along with this demand, further downsizing of the structure of the backlight unit of the liquid crystal display panel is required.

A cold cathode tube connection structure capable of improving assembly workability without requiring a large space in the connection portion in response to such a demand for miniaturization is disclosed in, for example, Japanese Patent Application Laid-Open No. 2002-124308 (Patent Document). Proposed in 1). The cold cathode tube connection structure includes a cold cathode tube having a lead terminal, a through hole, a terminal fitting soldered to the cold cathode tube in a state where the lead terminal is inserted into the insertion hole, and the terminal. And a feeder line to which the metal fitting is crimped.
JP 2002-124308 A

  However, in the connection structure proposed in the above publication, there is a problem that not only there is a limit to miniaturization of the connection part, but also there is a possibility that disconnection or the like may occur, resulting in poor reliability.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a wiring connection structure for a cold-cathode tube for a backlight of a liquid crystal display panel and a terminal fitting used therefor, which can further reduce the size of the connection portion and increase the reliability. Is to provide.

  A wiring connection structure for a backlight cold-cathode tube for a liquid crystal display panel according to one aspect of the present invention includes a cold-cathode tube having a pin terminal and a terminal electrically connected to the pin terminal of the cold-cathode tube A metal fitting and a lead wire having a conductor portion electrically connected to the terminal metal fitting are provided. The terminal fitting includes a cylindrical portion into which the pin terminal of the cold cathode tube is inserted, and a lead wire connecting portion formed so as to extend from the outer peripheral surface of the cylindrical portion and electrically connected to the conductor portion of the lead wire. including. The pin terminal and the terminal fitting are electrically connected by filling the inside of the cylindrical portion into which the pin terminal is inserted with solder.

  In the wiring connection structure according to the present invention, the pin terminal and the terminal fitting are electrically connected by filling the inside of the cylindrical portion with solder in a state where the pin terminal of the cold cathode tube is inserted into the cylindrical portion of the terminal fitting. Connected to. With this structure, even if the outer diameter of the cold cathode tube and the outer diameter of the pin terminal are reduced with the downsizing of the structure of the backlight unit of the liquid crystal display panel, According to the reduction in diameter, the outer diameter of the cylindrical portion can be reduced, or the thickness of the cylindrical portion can be reduced. Accordingly, the connection portion between the pin terminal of the cold cathode tube and the terminal fitting can be miniaturized by the wiring connection structure.

  Further, in the wiring connection structure of the present invention, since the solder is filled inside the cylindrical portion in which the pin terminal is inserted in order to electrically connect the pin terminal and the terminal metal fitting, the solder is outside the terminal metal fitting. It is not formed to spread. For this reason, even if an insulating exterior member is provided so as to cover the connecting portion, the exterior member does not bulge outward and does not break due to the bulge. Therefore, the reliability of the connection part between the pin terminal of the cold cathode tube and the terminal fitting can be enhanced by the wiring connection structure.

  Furthermore, in the wiring connection structure according to the present invention, since the solder is filled in the cylindrical portion in which the pin terminal is inserted, the solder is filled in the space between the pin terminal and the cylindrical portion without excess or deficiency. be able to. For this reason, the outer peripheral surface of a pin terminal and the inner peripheral surface of a cylindrical part are firmly joined by solder. Therefore, it is possible to improve the strength of the connection portion between the pin terminal of the cold cathode tube and the terminal fitting in the wiring connection structure, thereby improving the reliability.

  Furthermore, in the wiring connection structure of the present invention, the pin terminal is inserted into the cylindrical portion at the connection portion between the pin terminal of the cold cathode tube and the terminal fitting. In this case, the pin terminal is inserted into the cylindrical portion in such a form that the outer peripheral surface of the pin terminal having a predetermined length faces the inner peripheral surface of the cylindrical portion having a predetermined length. For this reason, when the pin terminal is inserted into the cylindrical portion, the cylindrical portion of the terminal fitting does not move around the pin terminal in an unstable manner, so that the solder between the pin terminal and the cylindrical portion is soldered. It is possible to perform the soldering operation for filling the substrate in a stable state. This effect is more remarkable as the difference between the outer diameter of the pin terminal and the inner diameter of the cylindrical portion is smaller. Thereby, automation of soldering work can be aimed at.

  In the wiring connection structure of the present invention, the lead metal is connected to the lead wire connecting portion formed so as to extend from the outer peripheral surface of the cylindrical portion by filling the inside of the cylindrical portion in which the pin terminal is inserted with the terminal fitting. Are electrically connected. For this reason, since the heat generated in the soldering operation is difficult to be transmitted to the outer peripheral surface of the cylindrical portion, it is difficult to transmit to the lead wire connecting portion formed so as to extend from the outer peripheral surface of the cylindrical portion. Therefore, even if the lead wire connection part of the terminal fitting and the conductor part of the lead wire are connected by crimping such as caulking, the connection part is not affected by the heat of the soldering operation, so the connection part is firmly Can be held. Thereby, the reliability of the connection part between a terminal metal fitting and a lead wire can be improved with a wiring connection structure.

  A terminal fitting according to another aspect of the present invention is a terminal fitting for electrically connecting a pin terminal of a cold-cathode tube for a backlight of a liquid crystal display panel and a lead wire, and the cold-cathode tube And a lead wire connecting portion formed to extend from the outer peripheral surface of the cylindrical portion and connected to the conductor portion of the lead wire.

  By using the terminal fitting of the present invention, the above-described effects can be achieved in the wiring connection structure of the backlight cold cathode tube of the liquid crystal display panel.

  In the terminal fitting of this invention, it is preferable that the lead wire connecting portion is formed so as to extend from the outer peripheral surface of the cylindrical portion in a direction intersecting with the central axis of the cylindrical portion.

  Thus, the terminal fitting of the present invention can be used when extending the lead wire in the direction of the axis of the cold cathode tube, that is, the direction intersecting the axis direction of the pin terminal of the cold cathode tube. it can.

  In the terminal fitting of the present invention, it is preferable that the lead wire connecting portion is formed so as to extend from the outer peripheral surface of the cylindrical portion along the direction of the central axis of the cylindrical portion.

  Thus, the terminal fitting of the present invention can be used in the case where the lead wire is extended and wired along the axial direction of the cold cathode tube, that is, the axial direction of the pin terminal of the cold cathode tube.

  In the terminal fitting of the present invention, it is preferable that the cylindrical portion has an opening formed so as to extend in the direction of the central axis.

  By doing so, the solder can easily flow through the opening when the inside of the cylindrical portion is filled with the connection with the pin terminal of the cold cathode lamp. For this reason, since it becomes easy to fill the inside of the cylindrical portion with solder, the connection with the pin terminal of the cold cathode rod can be strengthened.

  In the terminal fitting of the present invention, it is preferable that the cylindrical portion has an opening formed so as to extend in the circumferential direction.

  By doing in this way, elasticity can be given to the circumferential direction of a cylindrical part. For this reason, since it becomes easy to insert a pin terminal in a cylindrical part by the connection with the pin terminal of a cold cathode cage | basket, the connection by the solder with the pin terminal of a cold cathode cage | basket can be strengthened.

  As described above, according to the present invention, the connection portion between the pin terminal of the cold cathode tube and the terminal fitting can be miniaturized in the wiring connection structure of the backlight cold cathode tube of the liquid crystal display panel. In addition to improving reliability, the soldering operation of filling the space between the pin terminal and the cylindrical portion with solder can be performed in a stable state, and the connection between the terminal fitting and the lead wire The reliability of the part can also be improved. Moreover, the terminal fitting which can achieve said effect can be obtained with the wiring connection structure of the cold-cathode tube for backlight of the liquid crystal display panel.

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

  FIG. 1 is a perspective view showing a wiring connection structure of a backlight cold cathode tube of a liquid crystal display panel as one embodiment of the present invention.

  As shown in FIG. 1, the wiring connection structure 1 includes a terminal fitting 10, a cold cathode tube 20, and a lead wire 30.

  The cold cathode tube 20 includes an elongated tube portion 21 having an outer diameter of, for example, about 1.0 mm to 6.0 mm, and thin pin terminals 22 drawn from both ends of the tube portion 21, and includes a liquid crystal display panel. It is incorporated in the backlight unit and used as a light source.

  Two terminal fittings 10 are arranged on both sides of the cold cathode tube 20 and are electrically connected to the pin terminals 22 of the cold cathode tube 20. The terminal fitting 10 is made of, for example, phosphor bronze, brass or the like, and includes a cylindrical portion 11 as a cylindrical portion and a lead wire connecting portion 13. A pin terminal 22 of the cold cathode tube 20 is inserted into the insertion hole 12 extending along the central axis of the cylindrical portion 11. The pin terminal 22 and the terminal fitting 10 are electrically connected by filling the inside of the cylindrical portion 11 into which the pin terminal 22 is inserted, that is, the insertion hole 12 with solder. The outer diameter of the cylindrical portion 11 is, for example, about 0.8 to 1.4 mm, and the inner diameter is, for example, about 0.6 to 1.0 mm. The outer diameter of the pin terminal 22 is, for example, about 0.4 mm. The lead wire connecting portion 13 is formed so as to extend from the outer peripheral surface of the cylindrical portion 11 in a direction intersecting with the central axis of the cylindrical portion 11, for example, a direction orthogonal thereto.

  The conductor portion 31 of the lead wire 30 is electrically connected to the lead wire connecting portion 13 by, for example, a preliminary solder portion 40. For this connection, the conductor portion 31 of the lead wire 30 may be crimped to the lead wire connecting portion 13 by machining such as caulking.

  One end of the lead wire 30 is connected to the high frequency power source 70 so that a high frequency voltage of 1 kV or more can be applied to the pin terminals 22 at both ends of the cold cathode tube 20 via the lead wire 30.

  A connection portion between the pin terminal 22 of the cold cathode tube 20, the terminal fitting 10, and the conductor portion 31 of the lead wire 30 is covered with a rubber insulating protection cylinder 60. Since the insulation protection cylinder 60 has elasticity, the insulation protection cylinder 60 is disposed so that the pin terminal 22 and the cylindrical portion 11 are inserted into the insertion hole 61 and the conductor portion 31 of the lead wire 30 is inserted into the insertion hole 62. can do.

  FIG. 2 is a perspective view showing the connection structure between the terminal fitting and the lead wire in the wiring connection structure of FIG.

  As shown in FIG. 2A, the covering material is peeled off so that the conductor portion 31 is exposed at one end portion of the lead wire 30. The lead wire 30 and the terminal fitting 10 are arranged so that the exposed conductor portion 31 is connected to the lead wire connecting portion 13 of the terminal fitting 10.

  Next, by caulking the lead wire connecting portion 13 with the conductor portion 31 placed on the lead wire connecting portion 13, the surface of the lead wire connecting portion 13 is made conductive as shown in FIG. Crimp to part 31. In this way, the terminal fitting 10 and the lead wire 30 are electrically connected.

  Alternatively, a solder material is supplied and soldered in a state where the conductor portion 31 is placed on the lead wire connecting portion 13. In this manner, the terminal fitting 10 and the lead wire 30 may be electrically connected by forming the preliminary solder portion 40 as shown in FIG.

  3 is a perspective view and a partial cross-sectional view showing the connection structure between the terminal fitting and the pin terminal of the cold cathode tube in the wiring connection structure of FIG.

  As shown in FIG. 3A, the terminal fitting 10 is cooled so that the central axis direction of the cylindrical portion 11 of the terminal fitting 10 connected to the lead wire 30 is directed to the direction in which the pin terminal 22 of the cold cathode tube 20 extends. Arranged with respect to the cathode tube 20.

  Next, as shown in FIG. 3B, the pin terminal 22 of the cold cathode tube 20 is inserted into the cylindrical portion 11 of the terminal fitting 10, that is, into the insertion hole 12. Thereafter, the inside of the cylindrical portion 11 in which the pin terminal 22 is inserted is filled with a solder material and soldered.

  Finally, as shown in FIG. 3C, the connection portion between the pin terminal 22 and the cylindrical portion 11 of the terminal fitting 10, and the connection between the lead wire connection portion 13 of the terminal fitting 10 and the conductor portion 31 of the lead wire 30. A rubber insulating protective cylinder 60 is disposed as an exterior material so as to cover the portion. The solder portion 50 has a gap between the tube portion 21 and the end surface of the cylindrical portion 11 on the cold cathode tube 20 side as well as the space between the inner peripheral surface of the cylindrical portion 11 and the outer peripheral surface of the pin terminal 22. For example, the gap is filled. Thereby, the strength of the pin terminal 22 can be increased at the connection portion between the pin terminal 22 and the cylindrical portion 11 of the terminal fitting 10.

  In the wiring connection structure 1 of the present invention configured as described above, the solder portion 50 is provided inside the cylindrical portion 11 with the pin terminal 22 of the cold cathode tube 20 inserted into the cylindrical portion 11 of the terminal fitting 10. By being filled, the pin terminal 22 and the terminal fitting 10 are electrically connected. With this configuration, even if the outer diameter of the tube portion 21 and the outer diameter of the pin terminal 22 are reduced with the downsizing of the structure of the backlight unit of the liquid crystal display panel, the tube portion 21 and the pin terminal The outer diameter of the cylindrical portion 11 can be reduced or the thickness of the cylindrical portion 11 can be reduced according to the reduction in the diameter of the cylinder 22. Therefore, the connection part between the pin terminal 22 of the cold cathode tube 20 and the terminal fitting 10 can be miniaturized in the wiring connection structure 1.

  Further, in the wiring connection structure 1 of the present invention, since the solder part 50 is filled inside the cylindrical part 11 in which the pin terminal 22 is inserted in order to electrically connect the pin terminal 22 and the terminal fitting 10, The solder part 50 is not formed so as to extend outside the terminal fitting 10. For this reason, even if the insulation protection cylinder 60 is provided as an insulating exterior member so as to cover the connection portion, the insulation protection cylinder 60 does not bulge outward and does not break due to the bulge. Therefore, the reliability of the connection portion between the pin terminal 22 of the cold cathode tube 20 and the terminal fitting 10 can be enhanced in the wiring connection structure 1.

  Furthermore, in the wiring connection structure 1 of the present invention, the solder portion 50 is filled in the cylindrical portion 11 in which the pin terminal 22 is inserted, so that the space between the pin terminal 22 and the cylindrical portion 11 is excessive or insufficient. The solder portion 50 can be filled. For this reason, the outer peripheral surface of the pin terminal 22 and the inner peripheral surface of the cylindrical portion 11 are firmly joined by the solder portion 50. Therefore, the strength of the connection portion between the pin terminal 22 of the cold cathode tube 20 and the terminal fitting 10 can be improved in the wiring connection structure 1, thereby improving the reliability.

  Furthermore, in the wiring connection structure 1 of the present invention, the pin terminal 22 is inserted into the cylindrical portion 11 at the connection portion between the pin terminal 22 of the cold cathode tube 20 and the terminal fitting 10. In this case, the pin terminal 22 is inserted into the cylindrical portion 11 such that the outer peripheral surface of the pin terminal 22 having a predetermined length faces the inner peripheral surface of the cylindrical portion 11 having a predetermined length. For this reason, in a state where the pin terminal 22 is inserted into the cylindrical portion 11, the cylindrical portion 11 of the terminal fitting 10 does not move and tilt around the pin terminal 22 in an unstable manner. It is possible to perform a soldering operation of filling the space between the solders in a stable state. This effect is more remarkable as the difference between the outer diameter of the pin terminal 22 and the inner diameter of the cylindrical portion 11 is smaller. Thereby, automation of soldering work can be aimed at. In particular, in this embodiment, the cylindrical portion 11 as the cylindrical portion is formed in a cylindrical shape, so that the outer peripheral surface of the columnar pin terminal 22 extends over the entire inner peripheral surface of the cylindrical portion 11. Therefore, the pin terminal 22 and the cylindrical portion 11 can be firmly soldered together.

  In the wiring connection structure 1 of the present invention, a lead wire is formed in the terminal fitting 10 so that the inside of the cylindrical portion 11 into which the pin terminal 22 is inserted is filled with the solder portion 50 and extends from the outer peripheral surface of the cylindrical portion 11. The conductor portion 31 of the lead wire 30 is electrically connected to the connection portion 13. For this reason, since the heat generated in the soldering operation is difficult to be transmitted to the outer peripheral surface of the cylindrical portion 11, it is difficult to transmit to the lead wire connecting portion 13 formed to extend from the outer peripheral surface of the cylindrical portion 11. Therefore, as shown in FIG. 2B, even if the lead wire connecting portion 13 of the terminal fitting 10 and the conductor portion 31 of the lead wire 30 are connected by crimping or the like, the connecting portion is soldered. Therefore, the connection portion can be held firmly. Thereby, the reliability of the connection part between the terminal metal fitting 10 and the lead wire 30 can be improved in the wiring connection structure 1.

  FIG. 4 is a partial step view showing a connection structure between a conventional terminal fitting and a pin terminal of a cold cathode tube for comparison.

  As shown in FIG. 4, a flat disk portion 111 is formed on the terminal fitting used in the conventional wiring connection structure 2. An insertion hole 112 for inserting the pin terminal 22 of the cold cathode tube 20 is formed in the disc portion 111. In this case, since the solder part 50 tends to swell outward, the insulating protective cylinder 60 is likely to break when the insulating protective cylinder 60 is disposed outside as the exterior material. Therefore, there is a risk that the reliability of the conventional wiring connection structure is lowered.

  Further, as shown in FIG. 4, in the conventional wiring connection structure, the solder portion 50 is also formed on the outer surface of the lead wire connection portion 113 connected by caulking. For this reason, since the lead wire connecting portion 113 is affected by the heat generated in the soldering operation, there is a possibility that the strength of the connecting portion may be lowered, thereby reducing the reliability of the lead wire connecting portion 113. There is a fear.

  Further, as shown in FIG. 4, the pin terminal 22 is inserted into the insertion hole 112 of the disk part 111 of the terminal fitting. For this reason, in a state where the pin terminal 22 is inserted into the insertion hole 112, the disk part 111 of the terminal fitting may move and tilt around the pin terminal 22, so the pin terminal 22 and the disk part 111 may be inclined. The soldering work between and cannot be performed in a stable state.

  Furthermore, even if the outer diameter of the tube portion 21 and the outer diameter of the pin terminal 22 are reduced as the structure of the backlight unit of the liquid crystal display panel is reduced, the diameter of the tube portion 21 and the pin terminal 22 is reduced. Accordingly, there is a limit in reducing the outer diameter of the disk portion 111 of the terminal fitting.

  In the wiring connection structure 1 of the present invention, the above-described problem in the conventional wiring connection structure 2 can be solved.

  FIG. 5 is a perspective view showing various embodiments of the cylindrical portion in the terminal fitting of the present invention.

  As shown in FIG. 5A, a cylindrical shape can be adopted as the shape of the cylindrical portion 11a of the terminal fitting. In this case, since the cylindrical portion 11a is formed in a cylindrical shape, as shown in FIG. 6A, the outer peripheral surface of the columnar pin terminal 22 is the inner peripheral surface of the insertion hole 12a of the cylindrical portion 11a. Since the contact can be made evenly throughout the entire solder, the pin terminal 22 and the cylindrical portion 11a can be firmly soldered together in a close contact state. In the wiring connection structure 1 of the present invention shown in FIGS. 1 to 3, the cylindrical portion 11a shown in FIG.

  As shown in FIG. 5B, the cylindrical portion 11b of the terminal fitting is formed in a cylindrical shape and has an opening formed so as to extend in the direction of the central axis. In this case, when the solder is filled into the cylindrical portion 11b by connection with the pin terminal of the cold cathode rod, the solder is likely to flow through the opening. For this reason, since it becomes easy to fill the inside of the cylindrical part 11b with solder, the connection with the pin terminal of a cold cathode cage | basket can be strengthened.

  As shown in FIG. 5C, the cylindrical portion 11c of the terminal fitting is formed in a cylindrical shape, and has an opening formed so as to extend in the circumferential direction, for example, an opening formed in a spiral shape. Have. In this case, elasticity can be given to the circumferential direction of the cylindrical part 11c. For this reason, since it becomes easy to insert a pin terminal in the cylindrical part 11c by the connection with the pin terminal of a cold cathode cage | basket, the connection by the solder with the pin terminal of a cold cathode cage | basket can be strengthened.

  As shown in FIG. 5D, the cylindrical portion 11d of the terminal fitting may be formed in a triangular cylindrical shape. In this case, since the cylindrical portion 11d is formed in a triangular cylindrical shape, as shown in FIG. 6B, the outer peripheral surface of the cylindrical pin terminal 22 is the inner periphery of the insertion hole 12d of the cylindrical portion 11d. Since contact can be made evenly at three locations on the surface via solder, the pin terminal 22 and the cylindrical portion 11d can be soldered in a stable state.

  As shown in FIG. 5E, the tubular portion 11e of the terminal fitting is formed in a triangular tubular shape and has an opening formed so as to extend in the direction of the central axis. In this case, when the solder is filled into the cylindrical portion 11e by connection with the pin terminal of the cold cathode rod, the solder is likely to flow through the opening. For this reason, since it becomes easy to fill the inside of the cylindrical part 11e with solder, the connection with the pin terminal of the cold cathode cage can be strengthened.

  FIG. 7 is a diagram showing various embodiments of the lead wire connecting portion in the terminal fitting of the present invention.

  As shown in FIG. 7A, in the terminal fitting 10A, the lead wire connecting portion 13a extends from the outer peripheral surface of the cylindrical portion 11a as the cylindrical portion, and intersects the central axis of the insertion hole 12a of the cylindrical portion 11a. That is, it is formed to extend in the orthogonal direction. In this embodiment, the wiring connection structure 13a is formed so as to extend outward from the outer peripheral surface at one end surface of the cylindrical portion 11a.

  In this case, like the terminal fitting 10B shown in FIG. 7B, the lead wire connecting portion 13b may form a stepped surface with respect to one end surface of the cylindrical portion 11a. In the wiring connection structure 1 of the present invention shown in FIGS. 1 to 3, the terminal fitting 10B of FIG.

  Further, like the terminal fitting 10C shown in FIG. 7C, the lead wire connecting portion 13c may be formed by bending a part of the cylindrical portion 11a outward. By doing in this way, the material required for shape | molding a terminal metal fitting can be decreased.

  The terminal fittings 10A, 10B or 10C shown in FIG. 7A, B or C intersect the axial direction of the cold cathode tube, that is, the axial direction of the pin terminal of the cold cathode tube. This can be used when extending the lead wire in the direction.

  As shown in FIG. 7D, in the terminal fitting 10D, the lead wire connecting portion 13d extends from the outer peripheral surface of the cylindrical portion 11a as a cylindrical portion along the central axis of the insertion hole 12a of the cylindrical portion 11a. It is formed as follows.

  The terminal fitting 10D shown in FIG. 7D is a terminal fitting according to the present invention when the lead wire is extended along the axial direction of the cold cathode tube, that is, the axial direction of the pin terminal of the cold cathode tube. Can be used.

  FIG. 8 is a partial perspective view showing a wiring connection structure of a backlight cold cathode tube of a liquid crystal display panel as another embodiment of the present invention. In the wiring connection structure shown in FIG. 8, a terminal fitting 10D shown in FIG. 7D is employed. In this embodiment, a configuration is adopted in which the lead wire 30 is extended and wired along the axial direction of the cold cathode tube, that is, the axial direction of the pin terminal 22 of the cold cathode tube. The details of the wiring connection structure are the same as the structure shown in FIG. 3, and the same effects can be achieved.

  The embodiment disclosed above should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above embodiments but by the scope of claims, and includes all modifications and variations within the meaning and scope equivalent to the scope of claims.

It is a perspective view which shows the wiring connection structure of the cold-cathode tube for backlights of a liquid crystal display panel as one embodiment of this invention. FIG. 2 is a perspective view showing a connection structure between a terminal fitting and a lead wire in the wiring connection structure of FIG. 1 in order of steps. 2 is a perspective view and a partial cross-sectional view showing a connection structure between a terminal fitting and a pin terminal of a cold cathode tube in the wiring connection structure of FIG. It is a partial step view which shows the connection structure of the conventional terminal metal fitting and the pin terminal of a cold cathode tube for the comparison. It is a perspective view which shows various embodiment of a cylindrical part in the terminal metal fitting of this invention. It is a figure which shows the cross section of a cylindrical part in the terminal metal fitting of this invention. It is a figure which shows various embodiment of a lead wire connection part in the terminal metal fitting of this invention. It is a fragmentary perspective view which shows the wiring connection structure of the cold cathode tube for backlights of the liquid crystal display panel as another embodiment of this invention.

Explanation of symbols

  1: wiring connection structure, 10: terminal fitting, 11: cylindrical portion, 13: lead wire connecting portion, 20: cold cathode tube, 22: pin terminal, 30: lead wire, 31: conductor portion, 40: spare solder portion, 50: Solder part.

Claims (6)

A cold cathode tube having a pin terminal;
A terminal fitting electrically connected to a pin terminal of the cold cathode tube;
A wiring connection structure for a cold-cathode tube for a backlight of a liquid crystal display panel, comprising a lead wire having a conductor portion electrically connected to the terminal fitting,
The terminal fitting is
A cylindrical part into which the pin terminal of the cold cathode tube is inserted;
A lead wire connecting portion formed to extend from the outer peripheral surface of the cylindrical portion, and electrically connected to the conductor portion of the lead wire;
Wiring of a cold cathode tube for a backlight of a liquid crystal display panel, wherein the pin terminal and the terminal fitting are electrically connected by filling the inside of the cylindrical portion into which the pin terminal is inserted with solder. Connection structure. A terminal fitting for electrically connecting a pin terminal of a cold-cathode tube for a backlight of a liquid crystal display panel and a lead wire,
A cylindrical portion into which the pin terminal of the cold cathode tube is inserted;
A terminal fitting comprising: a lead wire connecting portion formed to extend from an outer peripheral surface of the cylindrical portion and connected to a conductor portion of the lead wire.   The terminal fitting according to claim 2, wherein the lead wire connecting portion is formed so as to extend from an outer peripheral surface of the cylindrical portion in a direction intersecting with a central axis of the cylindrical portion.   The terminal fitting according to claim 2, wherein the lead wire connecting portion is formed so as to extend from an outer peripheral surface of the cylindrical portion along a direction of a central axis of the cylindrical portion.   The terminal fitting according to any one of claims 2 to 4, wherein the cylindrical portion has an opening formed so as to extend in a direction of a central axis thereof. The terminal fitting according to any one of claims 2 to 4, wherein the cylindrical portion has an opening formed so as to extend in a circumferential direction thereof.

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