JPH06150884A - Fluorescent discharge lamp - Google Patents

Abstract

PURPOSE:To make connection work between a lead wire and an electric power supply wire easy and prevent the leakage at sealing parts of a glass tube and provide a fluorescent discharge tube with high connection reliability by attaching a plate-like outer electrode to the lead wire of the fluorescent discharge tube. CONSTITUTION:Regarding a fluorescent discharge tube 2, a plate-like outer electrode 1 is attached to a lead wire 4 led out of both ends of a glass tube 3. Consequently, since the electric power supply wire 6 can be soldered easily to the plate-like outer electrode 1, the connection work between the lead wire 4 and the electric power supply wire 6 can be carried out easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent discharge tube, and more particularly to a cold cathode fluorescent discharge tube (CFL) used as a light source for a backlight of a liquid crystal display device used as a display unit of a word processor or a personal computer. )
Etc. regarding a fluorescent discharge tube.

[0002]

2. Description of the Related Art For example, in a liquid crystal display device, two transparent glass substrates are superposed so that the surfaces on which the transparent electrodes and the alignment film are laminated face each other, and the liquid crystal is sealed between the two substrates. A backlight for irradiating light to the liquid crystal display element is disposed under the liquid crystal display element (liquid crystal cell, liquid crystal display panel) formed by attaching a polarizing plate to the outside of the panel, that is, on the side opposite to the display screen. The backlight is a liquid crystal display device in which a plurality of cold cathode fluorescent discharge tubes are arranged in parallel, or the light emitted from a light source is guided under the liquid crystal display device to a position away from the light source to emit light. A light guide plate made of a semitransparent synthetic resin for irradiating the entire liquid crystal display element is arranged, and one or two cold cathode fluorescent discharge tubes which are light sources are arranged close to the side surface of the light guide plate. In addition, a diffuser plate is arranged between the cold cathode fluorescent discharge tubes or light guide plates in which a plurality of them are arranged and the liquid crystal display element to diffuse and diffuse non-uniform light and uniformly irradiate the liquid crystal display element with light. Further, a reflection plate for reflecting light toward the liquid crystal display element is arranged below the cold cathode fluorescent discharge tubes or the light guide plate in which a plurality of them are arranged.

FIG. 2 is a partial sectional view of a conventional cold cathode fluorescent discharge tube used as a backlight for supplying light to a liquid crystal display element of a liquid crystal display device, for example.

In FIG. 2, 2 is a cold cathode fluorescent discharge tube, and 3 is
Is a glass tube coated with a phosphor (not shown) on its inner surface, 4 is vacuum-tightly sealed to the glass tube 3, and lead-in wires (electrode lead wires, dumet wires) 5 drawn from both ends of the glass tube 3 are Inside the glass tube 3, an internal electrode connected to the end of the lead-in wire 4, and 6 is a power supply line for applying a voltage to the internal electrode 5.

The cold cathode fluorescent discharge tube 2 has an outer diameter of about 2 to 6 m.
At m, the necessary voltage is applied to the internal electrode 5 from the power supply line 6 connected to the lead-in line 4 drawn from both ends of the glass tube 3 of the cold cathode fluorescent discharge tube 2 to emit light.

[0006]

Conventionally, as shown in FIG. 2, the lead-in wire 4 and the power supply wire 6 of the cold cathode fluorescent discharge tube 2 are twisted and twisted from each other, and the twisted portion is then removed. It was connected by soldering.

Therefore, this connecting work is troublesome and time-consuming, and this connecting work tends to apply an unreasonable force to the lead wire 4, which damages the sealing portion between the glass tube 3 and the lead wire 4 and causes a leak. I have a problem to do.

An object of the present invention is to facilitate the work of connecting the lead-in wire drawn from both ends of the glass tube of the fluorescent discharge tube and the power supply line and to prevent the occurrence of leakage at the sealing portion of the glass tube. , To provide a fluorescent discharge tube with high connection reliability.

[0009]

In order to achieve the above object, the present invention provides a fluorescent discharge tube in which a plate-shaped external electrode is attached to an introduction line drawn from both ends of a glass tube.

[0010]

In the present invention, since the lead wire of the fluorescent discharge tube is provided with the plate-shaped external electrode, the power supply line can be easily soldered to the plate-shaped external electrode. Connection work is easy. In addition, since an unreasonable force is not applied to the lead-in wire and damage to the sealing portion of the lead-in wire can be prevented, it is possible to prevent leakage from occurring in the sealing portion. Therefore, a fluorescent discharge tube with high connection reliability can be provided.

[0011]

1 (a) is a partial sectional view of a cold cathode fluorescent discharge tube according to an embodiment of the present invention, and FIG. 1 (b) is a plan view of a plate-shaped external electrode shown in FIG. 1 (a). FIG. 1C shows A of FIG.
1A is a cross-sectional view taken along the line A-A ', FIG. 1D is a plan view of a plate-shaped external electrode of another embodiment, and FIG.
FIG. 1F is a sectional view taken along the line BB ′ of FIG.
[Fig. 1] is a partial cross-sectional view of the cold cathode fluorescent discharge tube shown in Fig. 1 (a) after being connected to a power supply line.

This embodiment shows a cold cathode fluorescent discharge tube used as a backlight for supplying light to a liquid crystal display element of a liquid crystal display device.

In FIGS. 1 (a), 1 (b) and 1 (c), 2 is a cold cathode fluorescent discharge tube, 3 is a glass tube whose inner surface is coated with a phosphor (not shown), and 4 is glass tube 3 with vacuum gas. Introducing wires (Dumet wires) 5 which are tightly sealed and pulled out from both ends of the glass tube 3, 5 are internal electrodes connected to the ends of the introducing wire 4 inside the glass tube 3, and 1 is an outside of the glass tube 3. Disk-shaped external electrode connected to the lead-in wire 4, 7 is the external electrode 1
A round hole provided at the center of the external wire 1 into which the end of the lead-in wire 4 is inserted, and 8 is a solder for fixing the end of the lead-in wire 4 inserted in the round hole 8 of the external electrode 1 to the external electrode 1.

In FIG. 1C, 12 is a resin plate made of polyimide or the like (thickness is, for example, 50 to 125 μm), 11
Is a solderable metal plate (thickness: 35 μm, for example) made of copper or brass formed on the resin plate 12.

In FIG. 1F, 6 is a power supply line for applying a voltage to the internal electrode 5, and 10 is solder for fixing the power supply line 6 to the external electrode 1.

The cold cathode fluorescent discharge tube 2 has an outer diameter of about 2 to 6 m.
At m, the necessary voltage is applied to the internal electrode 5 from the power supply line 6 connected to the lead-in line 4 drawn from both ends of the glass tube 3 of the cold cathode fluorescent discharge tube 2 to emit light.

Conventionally, as described above, since the lead-in wire 4 and the power supply wire 6 are connected by directly tangling them, the connecting work is troublesome and time-consuming, and this connecting work leads to the lead-in wire. There is a problem in that excessive force is likely to be applied to No. 4, which causes damage to the sealing portion of the glass tube 3 and causes leakage at this sealing portion. In the cold cathode fluorescent discharge tube 2 of this embodiment, the disk-shaped external electrode 1 having an outer diameter substantially the same as the outer diameter of the glass tube 3 is attached to the lead-in wire 4 drawn from both ends of the glass tube 3. It is not necessary to twist the lead-in wire 4 and the power supply wire 6, and it is easy to solder the power supply wire 6 to the disc-shaped external electrode 1 as shown in FIG. Therefore, the work of connecting the lead-in wire 4 and the power supply line 6 is easy, and it is possible to prevent the sealing portion of the lead-in wire 4 from being damaged due to an unreasonable force being applied to the lead-in wire 4 by the connecting work. It is possible to prevent a leak from occurring in the sealing portion of No. 3. As a result, the cold cathode fluorescent discharge tube 2 with high connection reliability can be provided. Further, the cold cathode fluorescent discharge tube 2 can be easily handled during aging, inspection, packing, and the like.

In FIG. 1C, a circular resin plate 12 and a metal plate 11 which form the external electrode 1 are provided with a circular hole 7 having a conical cross section. As shown in e), it is preferable that the resin-made resin plate 12 and the metal plate 11 that form the external electrode 1 be provided with radial cuts 9 so that the lead-in wire 4 is less likely to come off. It should be noted that the external electrode 1 may be only the solderable metal plate 11, but the structure in which the metal plate 11 is attached to the elastic resin plate 12 is effective in preventing the lead wire 4 from coming off after insertion. Is.

Although the present invention has been specifically described above based on the embodiments, the present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made without departing from the scope of the invention. . For example, in the above embodiment, the external electrode 1 has a circular outer shape, but the outer shape is not limited to this and may be a polygonal shape or the like. Further, the size of the external electrode 1 does not have to be substantially the same as that of the glass tube 3. Further, in the above embodiment,
As shown in FIG. 1A, the end portion of the lead-in wire 4 is slightly projected from the external electrode 1, but it may not be projected. Further, in the above embodiment, the lead-in wire 4 and the external electrode 1 and the external electrode 1 and the power supply wire 6 are fixed by soldering, but they may be fixed by crimping, welding or the like. Further, in the above embodiment, the cold cathode fluorescent discharge tube 2 is described as an example, but it can be applied to a hot cathode fluorescent discharge tube. Further, the present invention is not limited to application to a light source for a backlight of a liquid crystal display device used as a display unit of a word processor or a personal computer.

[0020]

As described above, according to the present invention,
It is possible to provide a fluorescent discharge tube with high workability and connection reliability between the lead-in wire of the fluorescent discharge tube and the power supply line, and improve the reliability of the device in which the fluorescent discharge tube is mounted.

[Brief description of drawings]

1A is a partial cross-sectional view of a cold cathode fluorescent discharge tube according to an embodiment of the present invention, FIG. 1B is a plan view of a first example of a plate-shaped external electrode of FIG. c) is a cross-sectional view taken along the line AA ′ of (b), (d) is a plan view of a second example of the plate-shaped external electrode,
(E) is a sectional view taken along line BB 'of (d), and (f) is a partial sectional view of the cold cathode fluorescent discharge tube shown in (a) in a state of being connected to a power supply line.

FIG. 2 is a partial cross-sectional view of a conventional cold cathode fluorescent discharge tube.

[Explanation of symbols]

1 ... External electrode, 2 ... Cold cathode fluorescent discharge tube, 3 ... Glass tube,
4 ... Introduction line, 5 ... Internal electrode, 6 ... Power supply line, 7 ... Round hole, 8, 10 ... Solder, 9 ... Notch, 11 ... Metal plate, 1
2 ... Resin plate.

Claims (1)

[Claims] 1. A fluorescent discharge tube characterized in that a plate-shaped external electrode is attached to an introduction line drawn from both ends of a glass tube.