JP2001176581A - Connection structure of terminal, rod electrode of fluorescent lamp and current-supply core wire, surface light source device and image display unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize deviation in the dimension in connection between a current- supply core wire and a rod electrode and smoothen engagement of a rubber cap, as well as to improve a connection between the current-supply core wire and the rod electrode, thereby reducing labors of a worker who performs connection between the current-supply core and the rod shaped electrode. SOLUTION: After calking a terminal 40 formed in a prescribed shape to a current- supply core wire 38 of a lead 11, a hole 48 of an electrode-engaging portion 42 of the calked terminal 40 is engaged with a rod electrode 10 of a fluorescent lamp 7, and thereafter, the electrode-engaging portion 42 and the electrode 10 are fixed to each other with solder 43. And, a rubber cap 44 is engaged such that it is spanned between the lead 11 and the fluorescent lamp 7, and exposed areas of the current-supply core wire 38, the terminal 40 and the rod electrode 10 are covered with this rubber cap 44. As a result, preliminary soldering for the core wire 38 as in the conventional art becomes unnecessary, and the manually rounding process for the core wire 38 as in the conventional art also becomes unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface light source device for illuminating an image display panel such as a portable personal computer or a navigation device, and an image display device provided with the surface light source device, and particularly to a fluorescent lamp constituting the surface light source device. And a terminal used for connection between the rod-shaped electrode of the fluorescent lamp and the current-carrying core wire.

[0002]

2. Description of the Related Art For example, a liquid crystal display device as an image display device is used in a portable personal computer or the like, and irradiates a liquid crystal display panel (image display panel) with planar illumination light emitted from a surface light source device. An image is displayed on the surface of the liquid crystal display panel.

The surface light source device used in such a liquid crystal display device generally guides the light of a fluorescent lamp from the end face of the light guide plate to the inside of the light guide plate, and transmits the light incident on the light guide plate to the liquid crystal display panel of the light guide plate. The light emitted from the light guide plate illuminates the liquid crystal display panel in a planar shape from the surface facing the liquid crystal display panel. Here, in the fluorescent lamp, a rod-shaped electrode protruding from both ends thereof is connected to an external power supply via a conducting core wire, and an exposed portion of the rod-shaped electrode and the conducting core wire is covered with a rubber cap. This prevents an electrical accident such as a short circuit from occurring. The rubber cap is engaged with the connecting portion between the rod-shaped electrode and the conductive core wire as described above, and covers the exposed portion of the rod-shaped electrode and the conductive core wire, and accommodates the fluorescent lamp and the light guide plate. The fluorescent lamp is positioned with respect to the light guide plate by being engaged with the predetermined position.

FIG. 12 is a diagram showing a procedure for connecting the rod-shaped electrode 10 of the fluorescent lamp 7 of the above-described surface light source device and the conducting core wire 38. As shown in FIG. First, a plurality of energizing core wires 38 exposed at the end of the lead wire 11 are immersed in a molten solder bath to be formed into a rod shape (preliminary soldering), and after the solder is solidified, the energizing core wire 38 is engaged with the rod-shaped electrode 10. The ring-shaped portion 60 is formed by rounding to a size that fits (FIG. 12A, FIG. 1).
2 (b)). Next, the ring-shaped portion 60 of the conducting core wire 38 is fitted to the rod-shaped electrode 10 of the fluorescent lamp 7 (FIG. 12).
(B)) The ring-shaped portion 60 and the rod-shaped electrode 10 are fixed with the solder 43 (FIG. 12C). Thereafter, the exposed portions of the energizing core wire 38 and the rod-shaped electrode 10 are covered with a rubber cap 44 (FIG. 12D).

[0005]

However, conventionally, since the ring-shaped portion 60 shown in FIG. 12A is manually formed, the dimensional variation of the ring-shaped portion 60 is large, and the variation of the outer shape is large. Was also big. As a result, when the ring-shaped portion 60 is formed to be larger than the outer diameter of the fluorescent lamp 7 or the outer diameter of the lead wire 11, the rubber cap 44 is connected to the energizing core 38 and the rod-shaped electrode 1.
When engaging with the exposed portion of the rubber cap 44, the ring-shaped portion 60 of the conducting core wire 38 is caught by the hole 45 formed in the rubber cap 44, which causes a problem that the engagement operation of the rubber cap 44 is not performed smoothly. There was something.

Further, since the ring-shaped portion 60 of the energizing core wire 38 is manually rounded so as to have an extremely small inner diameter (for example, a size engaging with the rod-shaped electrode 10 having an outer diameter of 0.8 mm). Processing of the ring-shaped portion 60 of the energizing core wire 38 is difficult, which places a heavy burden on the operator.

Therefore, the present invention reduces the variation in the dimensions of the connection between the energizing core wire 38 and the rod-shaped electrode 10, facilitates the engagement operation of the rubber cap 44, and allows the connecting between the energizing core wire 38 and the rod-shaped electrode 10. The connection structure has been improved to provide
An object of the present invention is to reduce the labor of an operator who connects the rod 8 and the rod-shaped electrode 10.

[0008]

According to the first aspect of the present invention, there is provided a terminal for electrically connecting a rod-shaped electrode of a fluorescent lamp and a conducting wire. Further, the terminal of the present invention is characterized by comprising an electrode engaging portion that engages with the rod-shaped electrode of the fluorescent lamp, and a caulking fixing piece that bundles and fixes the energizing core wire.

According to a second aspect of the present invention, there is provided a connection structure between a rod-shaped electrode of a fluorescent lamp and a conductive core wire, wherein a terminal formed of a conductive material is formed with a caulking fixing piece and an electrode engaging portion, and the terminal is caulked. The current-carrying core wires are bundled and fixed by a fixing piece, and the electrode engaging portion of the terminal is engaged with the rod-shaped electrode of the fluorescent lamp,
The rod-shaped electrode of the fluorescent lamp and the electrode engaging portion of the terminal are fixed by soldering.

According to a third aspect of the present invention, a fluorescent lamp and a light guide plate are accommodated in a frame, light of the fluorescent lamp is made to enter the inside of the light guide plate from an end face of the light guide plate, and this incident light is transmitted to the light guide plate. This is a surface light source device that emits light in a planar manner from an emission surface. The surface light source device of the present invention includes a terminal for electrically connecting the rod-shaped electrode of the fluorescent lamp and the conductive core wire, and the terminal is formed with a caulking fixing piece and an electrode engaging portion. Then, the energizing core wires are bundled and caulked and fixed by the caulking fixing pieces of the terminal, and the electrode engaging portion of the terminal is engaged with the rod-shaped electrode of the fluorescent lamp, and the rod-shaped electrode of the fluorescent lamp is engaged with the electrode of the terminal. The fluorescent lamp is fixed by soldering and fixing the energizing core wire, the terminal and the exposed portion of the rod-shaped electrode with a rubber cap, and engaging the rubber cap with the rubber cap accommodating portion of the frame. It is characterized in that it is positioned on the frame.

According to a fourth aspect of the present invention, there is provided the surface light source device according to the third aspect, and an image display panel illuminated with light emitted from the surface light source device in a planar shape. Image display device.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

[First Embodiment] (Surface Light Source Device) FIGS. 1 and 2 relate to a surface light source device 1 according to an embodiment of the present invention. Figure 1
1 is an exploded perspective view of a surface light source device 1 according to an embodiment of the present invention. FIG. 2 is a sectional view taken along line AA of FIG. In these figures, a reflection sheet 3 and a light guide plate 4 are provided in a substantially rectangular frame 2.
And the prism sheet 5 are sequentially accommodated. The fluorescent lamp 7 is disposed so as to face the end surface (incident surface) 6 of the light guide plate 4. This fluorescent lamp 7
It is housed in a metal reflector (reflection member) 8 fixed to the frame 2, and has bar-shaped electrodes 10,
Reference numeral 10 is connected to external electrodes via lead wires 11,11.

The frame 2 is formed in a substantially rectangular shape by injection-molding a white synthetic resin. The metal reflector 8 is fixed to one end E1 of the frame 2, and the other end is formed. A metal support plate 12 is fixed to E2 so as to face the reflector 8.

Here, the frame 2 includes a first side 13 to which the reflector 8 is fixed, a second side 14 substantially perpendicular to one end of the first side 13, and the first side 13. 13, a third side 15 substantially perpendicular to the other end, and a fourth side 16 substantially perpendicular to the second side 14 and the third side 15. The tongue pieces 17, 17 for supporting the lower surface 3a of the reflection sheet 3 are formed inside the side 15 of FIG. A pair of reflector fixing portions 18 are formed at both ends of the first side 13. Further, a pair of support plate fixing portions 20 are formed at both ends of the fourth side 16.
A panel engaging portion 22 for accommodating a liquid crystal display panel (image display panel) 21 is formed on an upper peripheral edge of the frame 2. Note that a first engagement portion 23 that engages with the reflector 8 and a second engagement portion 24 that engages with the support plate 12 are formed on the lower surface side of the frame 2.

The reflector 8 is formed of a metal plate such as stainless steel or an aluminum alloy, and has a silver reflective layer formed on the entire inner surface thereof. The reflector 8 includes reflector fixing portions 18 on the first side 13 side of the frame 2.
And a base 26 fixed to the base by screws 25, 25,
6 and a flange 28 bent from the upright wall 27 toward the light guide plate 4 so as to be substantially parallel to the base 26. The lower base portion 26 is formed longer than the upper flange portion 28, is in close contact with the lower surface 3a side of the reflection sheet 3, and stably connects one end side of the reflection sheet 3, the light guide plate 4, and the prism sheet 5 to each other. I can support it. The upper flange portion 28 supports the rear surface side of the liquid crystal display panel 21, and the front end portion is located on the upper surface (emission surface) 30 side of the light guide plate 4. And the reflector 8 thus configured is
The light of the fluorescent lamp 7 is reflected by the silver reflection layer, and the reflected light is guided to the end surface (incident surface) 6 of the light guide plate 4.

The reflector 8 is fixed to the frame 2 so that the base 26 functions as a beam member of the frame 2 and the reflection sheet 3 and the light guide plate 4
In addition, the frame 2 functions as a support plate member that supports the prism sheet 5, and can reinforce the frame 2. Therefore, the frame 2 can be made thinner and smaller by the amount reinforced by the reflector 8. Also, the reflector 8
Since the reflection sheet 3 and the light guide plate 4 can be sandwiched between the base 26 and the flange 28, it is not necessary to form a portion for sandwiching the reflection sheet 3 and the light guide plate 4 on the frame 2 side.
Therefore, also in this respect, the frame 2 can be made thinner and smaller. The base 26 and the flange 28 of the reflector 8 hold the reflection sheet 3 and the light guide plate 4 with a small gap or hold them with a predetermined elastic force.

The support plate 12 is made of a metal plate such as stainless steel or an aluminum alloy and has a substantially L-shaped cross section, similar to the reflector 8 (see FIG. 1).
It is configured to be fixed to the side support plate fixing portions 20, 20 with screws 31, 31. Here, the support plate 12 is fixed to the support plate fixing portion 20, and supports the base 32 that supports the lower surface 3 a side of the reflection sheet 3, and rises from the base 32 and engages outside the fourth side 16. A back plate 33 is provided, and is integrated with the fourth side 16 of the frame 2 so as to reinforce the frame 2. Therefore, the thickness of the frame 2 can be reduced in conjunction with the function of the reflector 8. It is possible to reduce the size.

The reflection sheet 3 is formed of a white PET sheet having excellent reflectivity, and is large enough to be accommodated in the frame 2 and reflects light emitted from the lower surface 34 of the light guide plate 4 to the light guide plate 4 side. Is supposed to.

The light guide plate 4 is formed by injection molding a synthetic resin such as an acrylic resin so that the upper surface (emission surface) 30 is substantially rectangular and the cross-sectional shape is substantially wedge-shaped. It is formed so that the plate thickness becomes thinner as it gets away from it. Note that the incident surface 6 of the light guide plate 4 may be roughened, the amount of emitted light in the vicinity of the incident surface 6 may be adjusted, and a phenomenon in which the emitted light is repeatedly bright and dark (a reflection phenomenon) may be suppressed. A light diffusing ink (for example, an ink using magnesium carbonate, titanium oxide, or the like as a pigment) is selectively adhered to the upper surface 30 or the lower surface 34 of the light guide plate 4 or a pear surface (textured surface) is partially applied. Alternatively, the emitted light amount may be adjusted by diffusing the light.

The prism sheet 5 is formed of a translucent sheet material such as polyethylene terephthalate or acrylic resin, and a large number of prism surfaces 35 having a substantially triangular cross section are continuous on the surface (lower surface) facing the light guide plate 4. It is formed.
The prism surface 35 of the prism sheet 5 extends in a direction substantially parallel to the light incident surface 6 of the light guide plate 4.
The traveling direction of the light emitted from the liquid crystal display panel 2
It is designed so that 1 can be efficiently irradiated in a planar manner.

In the surface light source device 1 of the present embodiment configured as described above, light emitted from the fluorescent lamp 7 enters the inside of the light guide plate 4 from the incident surface 6 of the light guide plate 4, and the incident light The light is emitted directly from the emission surface 30 or repeatedly propagates in the light guide plate 4, and is emitted from the emission surface 30 when the light becomes a critical angle or less with respect to the emission surface 30. Then, the light emitted from the light guide plate 4 has its traveling direction corrected by the prism sheet 5 and illuminates the liquid crystal display panel 21 in a planar manner.

(Image Display Device) In the surface light source device 1 of the present embodiment, a liquid crystal display panel (image display panel) 21 is accommodated in the panel engaging portion 22 of the frame 2, and the liquid crystal display panel 21 is attached to the frame 2. By assembling, an image display device 36 that displays an image on the liquid crystal display panel 21 with illumination light emitted from the surface light source device 1 in a planar shape is configured.

(Connection Structure of Bar-shaped Electrode of Fluorescent Lamp and Lead Wire (Electrical Core Wire)) FIGS. 3 and 4 show a connection structure of the bar-shaped electrode 10 of the fluorescent lamp 7 and the lead wire 11.

First, the insulating coating 37 on the tip of the lead wire 11
Is removed, and the energizing core wire 38 is exposed. Next, a plurality of caulking fixing pieces 41, 41 of the terminal 40 formed of a conductive metal material (for example, phosphor bronze, copper, brass, etc.) and subjected to solder plating as necessary. The energizing core wires 38 are engaged, and the energizing core wires 38 are caulked and fixed by a pair of caulking fixing pieces 41, 41. Thus, the terminal 40 is fixed to the energizing core wire 38. next,
The electrode engaging portion 42 formed at the tip of the terminal 40 is engaged with the rod-shaped electrode 10 of the fluorescent lamp 7. Then, the electrode engaging portion 42 of the terminal 40 and the rod-shaped electrode 10 of the fluorescent lamp 7 are soldered 43
Then, the terminal 40 and the rod-shaped electrode 10 are fixed. 3 and 4 exemplify the connection structure of the left end of the fluorescent lamp 7, but the right end of the fluorescent lamp 7 is also symmetrical to the structure shown in FIGS. Connection structure with the conducting core wire 38). The soldering is performed from the engaging portion between the terminal 40 and the rod-shaped electrode 10 to the tip end side of the rod-shaped electrode 10 in order to facilitate the soldering operation.

Here, the length of the exposed core wire 38 is determined so that the leading end of the core wire 38 contacts the rod-shaped electrode 10 of the fluorescent lamp 7 or is located near the rod-shaped electrode 10. It is desirable to arrange so that 40 is located on the fluorescent lamp 7 side and the energizing core wire 38 is located on the tip side (left side in FIG. 3B) of the rod-shaped electrode 10. In this manner, when soldering the electrode engaging portion 42 of the terminal 40 and the rod-shaped electrode 10, the melted solder 43 penetrates into the gap between the bundled current-carrying core wires 38, and the current-carrying core wire 38 and the rod-shaped electrode 1
0 can be directly soldered, and the connection strength between the conducting core wire 38 and the rod-shaped electrode 10 is further increased.

As shown in FIG. 5, the power supply core wire 38 is located on the fluorescent lamp 7 side (right side in the figure) and the terminal 40 is located on the tip side of the rod-shaped electrode 10.
May be soldered (fixed with solder 43) from the engaging portion of the rod-shaped electrode 10 to the tip end of the rod-shaped electrode 10. However, with such a connection structure between the conducting core wire 38 and the rod-shaped electrode 10, the melted solder 43 penetrates into the gap between the bundled conducting core wires 38, and the conducting core wire 38 and the rod-shaped electrode 10 are directly soldered. It becomes difficult to do. However, as shown in FIG. 5, even if the structure is such that the energizing core wire 38 is located on the fluorescent lamp 7 side and the terminal 40 is located on the tip end side of the rod-shaped electrode 10, the terminal 40 and the rod-shaped electrode By soldering from the engaging portion 10 to the fluorescent lamp 7 side, the electrode engaging portion 42 of the terminal 40 and the rod electrode 10 can be soldered, and the energizing core wire 38 and the rod electrode 10 can be directly soldered. It becomes possible to attach.

Next, as shown in FIG. 6, a rubber cap 44 for insulation is engaged with a connecting portion between the rod-shaped electrode 10 of the fluorescent lamp 7 and the core wire 38 for energization.
Thus, the exposed portions of the rod-shaped electrode 10, the terminal 40 and the conducting core wire 38 are covered. This rubber cap 44
As shown in detail in FIG. 7, is formed into a shape like a square bar bent into a substantially L shape, and is engaged across the non-light emitting portion of the fluorescent lamp 7 and the end of the lead wire 11. Hole 45
Are formed in a substantially L-shape. Then, as shown in FIG. 6, the fluorescent lamp 7 is engaged with the rubber cap 44, which is engaged across the lead wire 11 and the fluorescent lamp 7, with the rubber cap accommodating portion 46 formed on the frame 2, thereby connecting the fluorescent lamp 7 to the frame. 2 and the fluorescent lamp 7 can be positioned with respect to the incident surface 6 of the light guide plate 4. Since the rubber cap 44 can be easily deformed, the rubber cap 44 is displaced and engaged with the fluorescent lamp 7 until the soldering of the terminal 40 and the rod-shaped electrode 10 is completed. After the attachment is completed, it is shifted to the position shown in FIG.

(Terminal) FIGS. 9 and 10 show the terminal 40 according to the present embodiment. 9 is an external perspective view of the terminal 40. FIG. FIG. 10A shows terminal 4
10 is a plan view of FIG. 10B, and FIG.
It is a figure cut and shown along the B line.

The terminal 40 shown in these figures is formed of a conductive metal material as described above, and has a pair of caulking fixing pieces 41, 41 and a substantially arc-shaped electrode connection formed on the tip end side. A joint 42 is provided.

The pair of caulking fixing pieces 41, 41 are curved so as to face each other, and caulked so as to embrace the energizing core wire 38 (see FIG. 8).
8 and the energizing core wire 38 and the terminal 40 are integrated. Here, the pair of caulking fixing pieces 41, 41 are shown in FIG.
As shown in (1), the curvature and the length of the lead wire 11 are set so that they do not protrude from the outer surface of the lead wire 11 when crimped (equal to or smaller than the outer diameter size of the lead wire 11). Has been determined.

The electrode engaging portion 42 is so formed that the substantially arc-shaped outer edge 47 does not protrude from the outer surface of the fluorescent lamp 7 (so as to be equal to or smaller than the outer diameter of the fluorescent lamp 7). 3) and FIG.
(A), FIG. 5 (a), FIG. 6 (a)), a hole 48 for engaging with the rod-shaped electrode 10 of the fluorescent lamp 7 is formed substantially at the center thereof, and the tip of the electrode engaging portion 42 is moved right and left. A slit 50 for dividing into two is formed. The peripheral edge 51 of the hole 48 is narrowed so as to protrude in the protruding direction of the caulking fixing piece 41 (the left side direction in FIG. 10B), and a rib 52 is formed around the hole 48.

As described above, since the slit 50 is formed in the electrode engaging portion 42 so as to divide the tip of the electrode engaging portion 42 into two parts, the outer diameter of the rod-shaped electrode 10 of the fluorescent lamp 7 varies. Even when the outer diameter of the rod-shaped electrode 10 is larger than the inner diameter of the hole 48, the rod-shaped electrode 10 is deformed to widen the slit interval and smoothly engages. In particular, a solder layer is formed on the outer surface of the rod-shaped electrode 10 (preliminary soldering is performed), and the electrode engaging portion 42 is formed.
When the soldering of the rod-shaped electrode 10 is facilitated, the thickness of the solder layer may vary. However, by forming the electrode engaging portion 42 as described above, the variation in the thickness of the solder layer can be reduced. Can be easily absorbed. Also, as mentioned above,
By narrowing the peripheral edge 51 of the hole 48, the peripheral edge 51 of the hole 48 is reduced.
A chamfered portion 53 is formed on the electrode, so that the work of engaging the electrode engaging portion 42 and the rod-shaped electrode 10 can be easily performed. Further, as described above, by forming the ribs 52 by narrowing the peripheral edge 51 of the hole 48, the strength of the peripheral edge 51 of the hole 48 can be increased.

As described above, in this embodiment, the terminal 40 formed in a predetermined shape in advance is caulked and fixed to the conducting core wire 38 of the lead wire 11, and the electrode engaging portion 42 of the caulked and fixed terminal 40 is formed. After the hole 48 is engaged with the rod-shaped electrode 10 of the fluorescent lamp 7, by soldering the electrode engaging portion 42 and the rod-shaped electrode 10, it is possible to electrically connect the conducting core wire 38 and the rod-shaped electrode 10. Therefore, the work of pre-soldering the conducting core wire 38 of the conventional example becomes unnecessary, and
The step of manually rolling the energizing core wire 38 of the conventional example is unnecessary (see FIG. 12A), and the work of connecting the energizing core wire 38 and the rod-shaped electrode 10 is facilitated. Therefore, according to the present embodiment, it is possible to reduce the number of manufacturing steps of the surface light source device 1 and the image display device 36 including the surface light source device 1.

Further, in the present embodiment, the current-carrying core wire 38 and the rod-shaped electrode 10 are connected via a terminal 40 formed in a predetermined shape in advance.
And the variation in the shape of the connecting portion between the conducting core wire 38 and the rod-shaped electrode 10 can be made smaller than in the conventional example. The outer diameter of the lamp 7 can be equal to or smaller than the outer diameter (see FIG. 4A), and the swaged portion of the terminal 40 can be prevented from protruding from the outer surface of the lead wire 11 ( 8), it is possible to smoothly and easily engage the rubber cap 44 across the lead wire 11 and the fluorescent lamp 7 (see FIG. 6).
Therefore, according to the present embodiment, when the rubber cap 44 is engaged across the lead wire 11 and the fluorescent lamp 7, excessive stress is applied to the conductive core wire 38 and the soldered portion between the terminal 40 and the rod electrode 10. In addition to preventing the rubber cap 44 from acting, the rubber cap 44 can be prevented from being damaged by the conducting core wire 38, the terminal 40, and the like. In the conventional example, the tip of the rounded energizing core wire 38 may protrude radially outward from the outer surface of the fluorescent lamp 7, and the end of the energizing core wire 38 may damage the rubber cap 44.

In this embodiment, since the energizing core wire 38 is caulked by the caulking fixing pieces 41, 41 of the terminal 40, the solder is moved from the caulking fixing portion by the caulking fixing pieces 41, 41 to the lead wire 11 side. It is possible to suppress the permeation of the conductive core wire 38 between the caulking fixed portion and the lead wire 11, that is, it is possible to secure the degree of freedom for bending the conductive core wire 38 between the caulked fixed portion and the lead wire 11. 38 can be flexibly bent, and wiring of the lead wire 11 becomes easy. As a result, the space required for disposing the lead wire 11 can be reduced, and the surface light source device 1 and the surface light source device 1
The degree of freedom in designing the image display device 36 provided with the surface light source device 1 and the size of the surface light source device 1 and the image display device 36 provided with the surface light source device 1 can be reduced. In the conventional example, the energizing core wire 38 is hardened by preliminary soldering or the like, and the energizing core wire 38 has poor flexibility and is easily broken. Was difficult.

[Second Embodiment] FIG. 11A is a plan view of a terminal 40 according to a second embodiment of the present invention. The terminal 40 shown in FIG. 11A is different from the first embodiment in the configuration in which the slit 50 is not formed in the electrode engaging portion 42. In the present embodiment, the rod-shaped electrode 1 is considered in consideration of the variation in the outer diameter of the rod-shaped electrode 10.
The size of the hole 48 is formed so that the hole 48 has a loose fit with respect to 0 (see FIGS. 11A and 6B).

Third Embodiment FIG. 11B is a plan view showing a terminal 40 according to a third embodiment of the present invention. The terminal 40 shown in FIG. 11B has a substantially U-shaped groove 54 formed in the electrode engaging portion 42, and the groove 54 is to be engaged with the rod-shaped electrode 10.

[Fourth Embodiment] FIG. 11C is a plan view of a terminal 40 according to a fourth embodiment of the present invention. The terminal 40 shown in FIG. 11C has a substantially U-shaped groove 55 formed in the electrode engaging portion 42, and a pair of protrusions 56, 56 formed on the side wall of the groove 55. When the bar-shaped electrode 10 is engaged with the groove 55, the bar-shaped electrode 10 is
When the electrode engaging portion 42 is elastically deformed so as to push open the groove 55 when the rod-shaped electrode 10 gets over, and the rod-shaped electrode 10 gets over the protrusions 56 and 56 and engages with the groove bottom 57, the rod-shaped electrode 10 is restored to the original shape. Then, the rod-shaped electrode 10 is connected to a pair of protrusions 56, 56.
Hold it as you hold it.

In the above-described first embodiment, the light guide plate 4 having a substantially wedge-shaped cross section has been described as an example. However, the present invention is not limited to this, and the upper surface (emission surface) 30 and the lower surface of the light guide plate 4 may be used. 3
For example, a light guide plate 4 formed in parallel or another light guide plate 4 having an appropriate shape is used.

The present invention is not limited to the above embodiments, but is also applicable to a case where the fluorescent lamps 7 are arranged on a plurality of side surfaces of the light guide plate 4.

In each of the above embodiments, only one prism sheet 5 is disposed on the upper surface 30 of the light guide plate 4. However, the present invention is not limited to this. Alternatively, two prism sheets combined such that the prism surfaces are substantially orthogonal to each other, a protective sheet, or the like may be appropriately disposed. Further, instead of the prism sheet 5, another light control member may be arranged on the upper surface 30 side of the light guide plate 4.

In each of the above embodiments, the terminal 4
Although the configuration in which the peripheral edge 51 of the hole 48 formed in the zero electrode engaging portion 42 is narrowed is illustrated, the configuration is not limited thereto.
May be adopted.

[0044]

As is apparent from the above description, according to the present invention, a terminal formed in a predetermined shape in advance is caulked and fixed to an energizing core wire, and an electrode engaging portion of the caulked and fixed terminal is shaped like a rod of a fluorescent lamp. After the electrode is engaged, the electrode engaging part and the rod-shaped electrode are soldered, so that the conventional work of pre-soldering the current-carrying core wire becomes unnecessary, and the conventional current-carrying core wire is manually worked. This eliminates the need for a rounding step, thereby facilitating the connection between the conducting core wire and the rod-shaped electrode. Therefore, according to the present invention, it is possible to reduce the number of manufacturing steps of the surface light source device and the image display device including the surface light source device.

Further, the present embodiment has a structure in which the current-carrying core wire and the rod-shaped electrode are connected via a terminal formed in a predetermined shape in advance, and there is a variation in the shape of the connection portion between the current-carrying core wire and the rod-shaped electrode. Can be made smaller than in the conventional example, so that the work of covering the exposed portions of the current-carrying core wire, the terminal and the rod-shaped electrode with the rubber cap is facilitated.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a surface light source device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the surface light source device taken along line AA of FIG.

FIG. 3 is a diagram showing an engagement state between a rod-shaped electrode of a fluorescent lamp and a terminal fixed to a current-carrying core wire. FIG. 3A is a side view, and FIG. 3B is a plan view.

FIG. 4 is a view showing a soldering state of a rod-shaped electrode of a fluorescent lamp and a terminal fixed to a current-carrying core wire. FIG. 4A is a side view, and FIG. 4B is a plan view.

FIG. 5 is a diagram showing another soldering state of the rod-shaped electrode of the fluorescent lamp and the terminal fixed to the conductive core wire. FIG. 5A is a side view, and FIG. 5B is a plan view.

FIG. 6 is a diagram showing a state in which a rubber cap engaged with an exposed portion of a rod-shaped electrode, a terminal, and a conductive core wire is engaged with a frame.
FIG. 6A is a side view, and FIG. 6B is a plan view.

FIG. 7 is a view showing a rubber cap. FIG. 7A is an external perspective view of the rubber cap, and FIG. 7B is a cross-sectional plan view.

FIG. 8 is a diagram showing a state in which the energizing core wire is caulked and fixed by a caulking fixing piece of the terminal.

FIG. 9 is an external perspective view of a terminal.

FIG. 10 is a detailed view of a terminal. FIG. 10A is a plan view of the terminal, and FIG. 10B is a side view cut along the line BB of FIG. 10A.

FIG. 11 is a diagram showing another embodiment of a terminal. FIG.
1 (a) is a plan view showing a second embodiment of the terminal, FIG. 11 (b) is a plan view showing a third embodiment of the terminal, and FIG. 11 (c) is a plan view of the terminal. FIG. 14 is a plan view showing a fourth embodiment.

FIG. 12 is a diagram showing a connection state between a conventional energizing core wire and a rod-shaped electrode of a fluorescent lamp. FIG. 12A is a diagram showing a state in which the energizing core wire is formed in a ring shape.
FIG. 12B is a diagram showing a state in which the ring-shaped portion of the current-carrying core wire is engaged with the rod-shaped electrode of the fluorescent lamp, and FIG. 12C is a diagram illustrating soldering of the ring-shaped portion of the current-carrying core wire and the rod-shaped electrode of the fluorescent lamp. FIG. 12D is a structural diagram of a connection portion between a current-carrying core wire and a rod-shaped electrode, which is shown by cutting a rubber cap.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Surface light source device, 2 ... Frame, 4 ... Light guide plate, 6
... End face (incident surface), 7 fluorescent lamp, 10 rod-shaped electrode, 21 liquid crystal display panel (image display panel), 3
0 top surface (outgoing surface), 36 image display device, 38
... Electrical core wire, 40 ... Terminal, 41 ... Caulking fixing piece,
42 ... electrode engaging part, 44 ... rubber cap, 46 ...
Rubber cap storage

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01J 61/36 H01R 4/70 B H01R 4/70 F21Y 103: 00 // F21Y 103: 00 G06F 1/00 320A

Claims (4)

[Claims] 1. A terminal for electrically connecting a rod-shaped electrode of a fluorescent lamp and a conductive core wire, wherein an electrode engaging portion engaging with the rod-shaped electrode of the fluorescent lamp and a conductive core wire are bundled and fixed by caulking. A terminal, comprising: a caulking fixing piece. 2. A caulking fixing piece and an electrode engaging portion are formed on a terminal formed of a conductive material, and a current-carrying core wire is bundled and caulked and fixed by the caulking fixing piece of the terminal. Is connected to a rod-shaped electrode of a fluorescent lamp, and the rod-shaped electrode of the fluorescent lamp and an electrode engaging portion of the terminal are fixed by soldering. 3. A fluorescent lamp and a light guide plate are accommodated in a frame, and light of the fluorescent lamp is made to enter the inside of the light guide plate from an end face of the light guide plate, and the incident light is planarized from an emission surface of the light guide plate. A surface light source device for emitting light; a terminal for electrically connecting the rod-shaped electrode of the fluorescent lamp and the conductive core wire; and a caulking fixing piece and an electrode engaging portion formed on the terminal; and a caulking fixing piece for the terminal. The electrode core of the terminal is engaged with the rod-shaped electrode of the fluorescent lamp, and the rod-shaped electrode of the fluorescent lamp and the electrode engaging part of the terminal are fixed by soldering. The fluorescent lamp is positioned on the frame by covering the exposed portions of the current-carrying core wire, the terminal and the rod-shaped electrode with a rubber cap, and engaging the rubber cap with the rubber cap accommodating portion of the frame. You Surface light source device. 4. An image display device comprising: the surface light source device according to claim 3; and an image display panel illuminated with light emitted in a planar shape from the surface light source device.