JP2010135225A - Mouthpiece, discharge lamp, and light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the reliability of connection between a lead equipped by a discharge tube and a lead-connecting part equipped by a mouthpiece. <P>SOLUTION: The light source device 30 is provided, having a discharge lamp 10 supported to a fixed substrate 32. The discharge lamp 10 consists of a discharge tube 1 and the mouthpiece 11. The mouthpiece 11 is provided with the mouthpiece body 12 of substantially a cylindrical shape; a coupling part 13 extended from a left edge of the mouthpiece body 12 toward left; and the lead connecting part 14, formed at a tip end part 13a of the coupling part 13. The mouthpiece body 12 is inserted into the inside of left-end part or a right-end part of the discharge tube 1. The lead connecting part 14 is of a cylindrical body with nearly a U-shaped cross-section shape, with its lower side part 14a being firmly fixed to the coupling part 13. Respective locking piece 14b1 is fitted at either tip end part of front and rear side parts 14b of the lead connecting part 14. The lead-connecting part 14 pinches a lead 6, 7 at the side parts 14b, and locks it with the locking pieces 14b1 from the tip end side of the side parts 14b to an outer periphery face of the leads 6, 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a base in which a discharge tube is attached to an end from which a lead is led and is electrically connected to the lead, a discharge lamp including the base, and a light source device.

  Cold cathode fluorescent discharge lamps (CCFLs) used as a backlight light source for liquid crystal display devices such as TV monitors and personal computers are disclosed in, for example, Japanese Patent Application Laid-Open No. 2007-234551 (Patent Document 1), WO 2008/001562 (Patent Document 2), and the like. Is known.

  A cold cathode fluorescent discharge tube (hereinafter simply referred to as a discharge tube) disclosed in Patent Document 1 has a cap attached to both ends to form a discharge lamp, and is attached to a connector disposed on a substrate or a fixed plate. It is attached with a base connected. The discharge tube has a lead wire electrically connected to the connector via a base, and is lit by receiving power from the connector.

  The caps disclosed in Patent Documents 1 and 2 are electrically connected to a lead wire at a lead connecting portion extending from the main body. In the base of Patent Document 1, the lead positioning accuracy is improved by accommodating the lead in the hole or groove provided in the lead tangent portion. However, it is required to further improve the reliability of the connection between the lead and the lead connection portion. There is also a demand for a discharge lamp having a structure that can easily connect the lead and the lead connecting portion while preventing damage to the glass tube.

JP 2007-234551 A WO2008 / 001562 publication

  Accordingly, an object of the present invention is to provide a base, a discharge lamp, and a light source device that can improve the reliability of connection between a lead and a lead connection portion.

In order to solve the above problems, the base of the present invention is a base that is attached to the end of the discharge tube from which the lead is led out and is electrically connected to the lead, and is inserted into the end of the discharge tube. A base body, a connecting part extending from the base body, and a lead connection part electrically connected to the lead, the lead connection part having elasticity on an outer peripheral surface of the lead, and the lead A pair of clamping parts is provided, and both the clamping parts are provided with a locking part for locking the outer peripheral surface of the lead from the front end side of the clamping part at a position facing each other.
The discharge lamp of the present invention is a discharge lamp comprising a discharge tube having a lead led out from an end, and a base that is attached to the end and connects a lead connecting portion to the lead. Is attached to the discharge tube, and the lead and the base are electrically connected to each other.
Further, in the light source device of the present invention, a base provided in the discharge lamp according to claim 2 is attached to a connector provided on a fixed substrate, and the connector and the lead are electrically connected via the base. It is characterized by that.

  According to the present invention, the reliability of the connection between the lead and the lead connecting portion can be improved by holding the lead between the pair of holding portions elastically in contact with the outer peripheral surface of the lead.

Hereinafter, the best mode of the present invention will be described with reference to the drawings.
FIG. 1 shows a light source device 30 of the present embodiment, FIG. 1 (a) is a plan view thereof, and FIG. 1 (b) is a cross-sectional view showing an enlarged CC section shown in FIG. 1 (a). is there. FIG. 2 is a cross-sectional view showing the discharge tube 1. 3A and 3B are diagrams showing an end side of the discharge lamp 10 according to the present embodiment (a part of the discharge lamp 10 including the base 11), where FIG. 3A is a plan view and FIG. 3B is an AA view of FIG. Line sectional view, (c) is a left side view. Note that the vertical, front-rear, and left-right directions used in the following description are shown in the drawings used for the description. These top / bottom, front / rear, and left / right are described for explanation, and needless to say, may be different from the actual arrangement. Further, in FIG. 3, only a part of the discharge lamp 10 is shown to omit the illustration, and only one base 11 connected to one lead 6 is shown. The other base 11 is connected.

  As shown in FIG. 1, the light source device 30 is a surface light source configured by supporting the discharge lamp 10 on a fixed substrate 32 with a connector 31, and is used as a backlight of a liquid crystal display device or the like. The discharge lamp 10 is a cold cathode fluorescent discharge lamp (CCFL) comprising an assembly of a discharge tube 1 and a base 11.

  As shown in FIG. 2, the discharge tube 1 is configured to surround the electrodes 2 and 3 with a rod-shaped glass tube 4 having a phosphor layer 5 on the inner wall, and is filled with mercury. Leads 6 and 7 extending from the electrodes 2 and 3 are led out from both left and right ends of the glass tube 4.

  As shown in FIG. 1, the base 11 is for electrically and mechanically coupling the discharge lamp 10 to the connector 31. For example, a phosphor bronze plate having a thickness of 0.3 mm and having a surface plated with nickel is used. It is formed by pressing. As shown in FIG. 3, the base 11 includes a metal base body 12 having a substantially cylindrical shape, a connecting portion 13 extending leftward from the left edge of the base body 12, and a connecting portion 13 from the base body 12. For example, a lead connection portion 14 formed at the distal end portion 13a of the coupling portion 13 and a protruding piece 15 protruding inward of the base body 12 from the left edge of the base body 12 are provided.

  The base body 12 has an inner diameter (for example, 4.6 mm) larger than the outer diameter (for example, 4.4 mm) of the glass tube 4, and the left and right ends of the discharge tube 1 are inserted inside. A slit 16 penetrating the base body 12 from the inside to the outside is formed in the rear wall of the base body 12.

  The slit 16 extends along the axial direction of the base body 12 from the left end to the right end of the base body 12. A plurality of protrusions 17 are provided on the inner surface of the base body 12 so as to protrude at equal intervals along the circumferential direction of the base body 12. In this embodiment, the three protrusions 17 are arranged at intervals of about 120 degrees. Each projection 17 is formed at the same time as the press working, and projects in a hemispherical shape or a truncated cone shape toward the inside of the base body 12. The height of the protrusion 17 protruding from the base body 12 is determined so that the glass tube 4 can be inserted into the base body 12 and the base body 12 can elastically hold the glass tube 4. The protruding piece 15 is formed at the front end of the base body 12 facing the slit 16.

  The connecting portion 13 is a strip-shaped conductor having a width (for example, 0.5 to 1.0 mm) sufficiently narrower than the length (width) of the base body 12 in the circumferential direction, and is integrally formed with the base body 12. Yes. The connecting portion 13 is bent from the lower end portion of the left end surface of the base body 12 toward the axial center of the base body 12 and then bent upward, and the distal end portion 13a extends leftward. It can be slightly elastically deformed in both the vertical and horizontal directions.

  The lead connecting portion 14 is a separate part from the connecting portion 13, has a substantially U-shaped cross-sectional shape, has a width in the extending direction of the lead 6 (left direction in FIG. 3), and a leading end portion of the connecting portion 13. A lower side portion 14a is fixed to the lower surface of 13a. Locking pieces 14b1 are provided at the front end portions of the front and rear side portions 14b of the lead connection portion 14, respectively, and the lead 6 is held between the lead connection portions 14. Both the locking pieces 14b1 are arranged at positions facing each other inside the side portion 14b, and the interval between the both locking pieces 14b1 is narrower than the diameter of the lead 6, and locks the outer peripheral surface of the lead 6. .

  Next, an operation process when the base 11 is attached to the discharge tube 1 will be described. FIG. 4 is a diagram for explaining an operation process when connecting the lead connection portion 14 to the leads 6 and 7 of the discharge tube 1.

  When the discharge tube 1 is inserted into the base 11 from the right end side (see FIG. 3) of the base body 12, as shown in FIG. 4, that is, the inscribed circle of the three protrusions 17 before the glass tube 4 is inserted. Is slightly smaller than the diameter of the glass tube 4, and when the base 11 is inserted into the glass tube 4, the inscribed circles of the three protrusions 17 are caused by slight elasticity of the protrusions 17 and elastic deformation of the base body 12 based on the slits 16. Is the same as the diameter of the glass tube 4, and the protrusion 17 is fitted to the outer peripheral surface of the glass tube 4 to stably hold the base body 12 on the glass tube 4. As a result, the discharge tube 1 is positioned with respect to the base 11.

  When the glass tube 4 is inserted into the base body 12, a pair of locking pieces 14b1 provided in the lead connecting portion 14 is inserted into the leads 6 and 7 of the discharge tube 1 from below as indicated by arrows in FIG. Then, the lead connection part 14 in which the locking pieces 14b1 are pressed by the leads 6 and 7 expands the side part 14b as shown in FIG. When the centers of the leads 6 and 7 reach into the lead connecting portion 14, the side portions 14b are narrowed by stress due to deformation of the lower side portion 14a and / or the side portions 14b, and the leads 6 and 7 as shown in FIG. Is accommodated in the lead connecting portion 14. The leads 6 and 7 accommodated in the lead connection portion 14 are sandwiched between the pair of locking pieces 14 b 1, the front and rear side portions 14 b of the lead connection portion 14, and the distal end portion 13 a of the coupling portion 13. To obtain an electrical and mechanical connection between the leads 6 and 7 and the lead connecting portion 14. Therefore, the height of the portion connected to the leads 6 and 7 of the pair of locking pieces 14b1 is lower than the highest position on the outer peripheral surface of the leads 6 and 7.

  In this way, the discharge lamp 10 constituted by attaching the base 11 to the left and right ends of the discharge tube 1 is connected to the connector 31 fixed to the common fixed substrate 32 as shown in FIG. The base 11 is held and connected. The connector 31 elastically holds the base body 12 of the base 11 with a metal spring piece, and the connector 31 is connected to a power source (not shown). When a predetermined voltage is applied to the leads 6 and 7 from the power supply via the connector 31, the discharge lamp 10 is turned on.

  As shown in FIG. 1B, the base body 12 and the glass tube 4 are in contact with each other at a small area (point contact) via the protrusions 17, and the glass tube is not provided in the portion of the base body 12 where the protrusions 17 are not provided. An air layer (gap) is generated between 4 and the base body 12. Since this air layer (gap) has a lower thermal conductivity than the protrusion 17, the thermal conduction between the glass tube 4 and the base body 12 is more effectively suppressed.

  According to the present embodiment, since the leads 6 and 7 of the discharge lamp 10 and the connecting portion 13 of the base 11 are electrically and mechanically coupled by the lead connecting portion 14, only the leads 6 and 7 and the connecting portion 13 are used. Compared to the conventional connection, the connection can be made stronger, and the reliability of the connection between the leads 6 and 7 and the base 11 can be improved.

  Further, according to the present embodiment, since the leads 6 and 7 can be positioned by sandwiching the leads 6 and 7 with the lead connecting portion 14, the stress applied to the leads 6 and 7 can be suppressed, and the damage to the leads 6 and 7 can be prevented. Can be prevented.

  In addition, according to the present embodiment, the leads 6 and 7 can be fixed to the base 11 by sandwiching the leads 6 and 7 between the locking pieces 14b1 of the lead connection portion 14, so that the lead connection portion 14 is connected to the lead connection portion. When connecting to 6, 7, it is not necessary to perform caulking, and when the base 11 is attached to the discharge tube 1, the base 11 can be easily attached to the discharge tube 1.

  In addition, according to the present embodiment, since the connecting portion 13 that connects the lead connecting portion 14 and the base body 12 has an elastically deformable band shape, when the base 11 is attached to the discharge tube 1, It is possible to suppress stress from being applied to the leads 6 and 7 and to prevent the stress from spreading from the lead connecting portion 14 to the glass tube 4. In particular, the lead connection portion 14 is inserted into the leads 6 and 7 through the coupling portion 13 that can be elastically deformed in the direction in which the lead connection portion 14 is inserted into the leads 6 and 7 from the base body 12 that stably holds the glass tube 4. Since the leads 6 and 7 and the lead connection portion 14 are electrically and mechanically connected, it is possible to suppress stress from being applied to the leads 6 and 7 from the lead connection portion 14 when the base 11 is attached to the discharge tube 1. In addition, the spread of stress from the lead connection portion 14 to the glass tube 4 can be effectively prevented.

  Further, according to the present embodiment, since the protrusion 17 is provided on the inner surface of the base body 12 and the base body 12 is elastically deformed by the slit 16, the base body 12 can be easily and satisfactorily fitted to the glass tube 4. It is possible to easily obtain a desired space having a heat insulating action between the base body 12 and the glass tube 4.

  Moreover, according to this embodiment, since the projection 17 of the base body 12 has a hemispherical shape, the glass tube 4 can be smoothly inserted into the base body 12.

  Further, according to the present embodiment, the height of the engaging portion 14b1 of the lead connecting portion 14 connected to the lead 6 is substantially equal to the upper side of the outer periphery of the lead 6 in FIG. Thus, the elastically deformed lead connecting portion 14 does not pop out as much as before the leads 6 and 7 are sandwiched. Further, since the leads 6 and 7 are not crimped and connected, the leading end of the lead connecting portion 14 on the side of the locking portion does not jump out of the leads 6 and 7 so much. Therefore, when the discharge lamp 10 with the base 11 attached is attached to the connector 31, the lead connection portion 14 does not get in the way and is attached to the connector 31 without considering the direction of the discharge lamp 10.

  In the above embodiment, the case where the slit 16 is formed in the base body 12 in order to make the base body 12 elastically deformable in the radial direction has been described, but the base body 12 does not necessarily need to include the slit 16.

  The base 11 may be formed of another metal plate such as a copper alloy plated with gold. Further, the base body 12, the connecting portion 13, and the protruding piece 15 do not need to be integrally formed, and those formed separately may be joined by welding or the like. In FIG. 3, the lead connection portion 14 is connected to the lower surface of the coupling portion 13, but may be connected to the upper surface. Moreover, the lead connection part 14 does not need to be formed separately from the coupling part 13 and may be configured as a lead connection part 140 shown in FIG. 5 formed integrally.

  The lead connecting portion 140 shown in FIG. 5 is formed by bending upwardly an extending piece 14c extending in the front-rear direction from the distal end portion 13a of the connecting portion 13, and the bent extended piece 14c and the distal end portion 13a are formed. It has a substantially U-shaped cross-sectional shape. The front and rear side portions (extending pieces) 14 c of the lead connection portion 140 are curved so as to exhibit a cross-sectional shape along the outer peripheral surface of the leads 6 and 7, and the outer peripheral surface of the leads 6 and 7 is formed at the tip portion. A locking curved portion 14c1 for locking is provided. The lead connecting portion 140 sandwiches the leads 6 and 7 by the front and rear side portions 14c, and locks the outer peripheral surfaces of the leads 6 and 7 by the locking curved portion 14c1 to position the leads 6 and 7. Note that the lead connecting portion 14 described above may be configured to include a locking curved portion similar to the locking curved portion 14c1 instead of the locking piece 14b1.

  Moreover, it is good also as a structure which makes the outer peripheral surface of the glass tube 4 with which the discharge tube 1 is provided contact the base body 12 over the perimeter, without the base body 12 having the protrusion 17. Moreover, the structure of the connection part 13 is arbitrary, and it is good also as a structure provided with the small diameter part extended through shrinkage | contraction from the edge part of the nozzle | cap | die main body 12, and the tongue-shaped tip part 13a protruded from the front-end | tip of this small diameter part. . The leads 6 and 7 pass through the inside of the base body 12, are inserted into the small diameter portion of the connecting portion 13, extend the tip portion to the tip portion 13 a of the connecting portion 13, and are connected to the lead connecting portion 14.

  Moreover, it is good also as a structure which replaces with the protrusion 17 and provides a protrusion in the outer peripheral surface of the edge part of the glass tube 4 to which the nozzle | cap | die 11 is attached. The protrusion can be formed by printing on the outer peripheral surface of the glass tube 4 with polyimide ink or by sticking a polyimide tape to the outer peripheral surface of the glass tube 4. In addition, by applying a material having poor thermal conductivity such as a heat-resistant foam film to the outer peripheral surface of the end of the glass tube 4 on which the base 11 is mounted, or by providing a convex portion such as DIP (Dual Inline Package), A material having poor thermal conductivity may be inserted between the glass tube 4 and the base 11. The convex portions may be provided at any positions in the circumferential direction and the length direction of the glass tube, and the number thereof is also arbitrary.

  Moreover, you may have the structure which accommodates the connection part 13 and the lead connection part 14 in the nozzle | cap | die main body 12. FIG. That is, the connecting portion 13 and the lead connecting portion 14 do not necessarily have to extend leftward from the base body 12. Further, the base 11 may be fixed to the discharge tube 1 by supporting the leads 6 and 7 with the connecting portion 13 without bringing the base body 12 into contact with the glass tube 4.

  Alternatively, the end of the slit 16 may be bent slightly inside the base body 12. According to this configuration, even if a burr, that is, a smiling projection is generated due to press processing in a portion adjacent to the slit 16 of the base body 12, the burr does not come out from the circumscribed circle of the base body 12. When mounted on the glass tube 4 or when the discharge lamp 10 is mounted on the connector 31, it is not affected by burrs. Further, the protrusion 17 described above may have a gentle structure on the side where the leads 6 and 7 are inserted. Moreover, the convex part of the glass tube 4 mentioned above may be comprised gently on the side where the base body 12 is mounted.

  Moreover, the thing similar to the protection piece 55 shown by FIG. 1 of WO2008 / 001562 (patent document 2) can be provided near the connection part 13. FIG. Moreover, the same thing as the front stop piece 56 shown by FIG. In addition, the configuration in which the base body 12 is fixed to the glass tube 4 through a protrusion is replaced with a configuration using an elastic holding piece disclosed in WO2008 / 001562 (Patent Document 2) or a similar one. Can do. Moreover, it is good also as a structure with which the base body 12 equips the small diameter part 52 shown in FIG. 1 of WO2008 / 001562 (patent document 2), the large diameter part 53, or something similar to this.

  Further, at the position different from the protrusion 17 in the axial direction of the base body 12, a protrusion having the same shape as or different from the protrusion 17 protruding in a hemispherical shape can be additionally provided inside the base body 12 in the radial direction. In this case, the circumferential positions of the plurality of protrusions at different axial positions may be the same as or different from the same position of the protrusion 17.

  The shape of the connecting portion 13 is arbitrary as long as the base body 12 and the lead connecting portion 14 are connected and can be slightly elastically deformed in any of the upper, lower, left and right directions. Moreover, the shape of the discharge tube 1 is arbitrary, and the base 11 can be attached to the discharge tube 1 having a shape other than the rod shape. Further, the base 11 may be formed in the whole glass tube 4 or the end of the glass tube 4 in another shape that is not cylindrical, for example, a cylindrical shape such as a square cross section.

  The lead connection portion 14 is a pressure contact. One or two or all selected from welding and brazing can be performed and coupled to the connecting portion 13. Further, the leads 6 and 7 sandwiched by the lead connecting portion 14 are pressed. One or two or all selected from welding and brazing may be performed to couple to the lead connection 14. A welding method in the case of performing these couplings by welding is arbitrary, and laser welding, spot welding, or the like can be performed.

It is a figure which shows the light source device of one Embodiment of this invention, (a) is the top view, (b) is sectional drawing which expanded and showed CC cross section shown by (a). It is sectional drawing of the discharge tube shown in FIG. It is a figure which shows a part of discharge lamp containing a nozzle | cap | die shown in FIG. 1, (a) is a top view, (b) is the sectional view on the AA line of (a), (c) is a left view. It is a figure explaining the work process at the time of connecting a lead connection part to the lead of a discharge tube. It is a figure explaining the modification of a lead connection part.

Explanation of symbols

30 Light source device 31 Connector 32 Fixed substrate 10 Discharge lamp 1 Discharge tube 6, 7 Lead 11 Base 12 Base body 13 Connecting portion 13a Tip portion 14, 140 Lead connecting portion 14a Lower side portion 14b, 14c Side side portion (clamping portion)
14b1 locking piece (locking part)
14c1 Locking curved part (locking part)
15 Projection piece 16 Slit 17 Projection

Claims (3)

A base attached to the end of the discharge tube from which the lead is led out and electrically connected to the lead,
A base body inserted into an end of the discharge tube, a connecting part extending from the base body, and a lead connection part electrically connected to the lead;
The lead connecting portion includes a pair of clamping portions that have elasticity on an outer peripheral surface of the lead and clamp the lead,
Both said clamping parts are equipped with the latching | locking part which latches the outer peripheral surface of the said lead from the front end side of the said clamping part in the position which mutually opposes. A discharge lamp comprising a discharge tube with a lead led out from an end, and a base attached to the end to connect a lead connection to the lead;
A discharge lamp comprising: the base according to claim 1 mounted on the discharge tube; and the lead and the base are electrically connected.   A light source device comprising: a connector provided on a fixed substrate; and a base provided in the discharge lamp according to claim 2 attached thereto, wherein the connector and the lead are electrically connected via the base.

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