JP3035644U - Cold cathode discharge lamp - Google Patents

Abstract

(57) [Abstract] [Problem] To provide a cold cathode discharge lamp in which cracks are not generated in a sealing portion when mounted on a liquid crystal display device. [Solution] A pair of internal electrodes 3a, 3b are sealed inside both ends of the glass bulb 1, and lead-in wires 6a, 6b electrically connected to the internal electrodes 3a, 3b are provided outside the glass bulb 1. In a cold cathode discharge lamp that is led out in an airtight manner, a spacer 5 is provided outside one sealing portion 4b, and the spacer 5 and the internal electrode 3b are electrically connected.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a cold cathode discharge lamp used as a back light source for liquid crystal display devices such as word processors, personal computers and liquid crystal televisions.

[0002]

[Prior art]

 A straight-tube type cold cathode discharge lamp used as a back light source of a conventional liquid crystal display device will be described below with reference to FIG.

A fluorescent film 2 is formed on the inner wall surface of a straight tube-shaped glass bulb 1. A pair of internal electrodes 3a and 3b are sealed inside both ends of the glass bulb 1. Both ends of the glass bulb 1 are sealed by melting bead glass or the like, and the lead-in wires 6a and 6b electrically connected to the internal electrodes 3a and 3b are led out to the outside from the sealed portions 4a and 4b. Has been done.

The end of the harness 9, which is a power supply cord, exposes the connected portion, and the exposed core wire 10 and the outer ends of the lead-in wires 6a and 6b are connected by a soldering process.

[0005]

[Problems to be solved by the device]

 However, in the case of the conventional cold cathode discharge lamp, when connecting the lead-in wire and the exposed core wire of the harness by soldering, firstly, the harness has a sufficient length. It is necessary to route in a narrow space inside the equipment, and during this routing, the sealing part may be damaged by the force applied from the outside to the sealing part on both ends of the glass bulb. There is a problem in that the heating may cause damage such as cracks in the sealed portion.

Further, if both ends of the glass bulb are hermetically sealed by a hermetic seal, when the harness is pulled out in the tube axis direction of the glass bulb, the fitting property with the display device is poor and it is not preferable as a back light source. There was a problem.

The present invention was created to improve the above problems.

[0008]

[Means for Solving the Problems]

 In the invention according to claim 1 of the present invention, a pair of internal electrodes are sealed inside both ends of the glass bulb, and an introduction wire electrically connected to the internal electrodes is hermetically led to the outside of the glass bulb. The cold cathode discharge lamp thus constructed is characterized in that a spacer is provided outside one sealing portion.

A second aspect of the present invention is a cold cathode fluorescent lamp in which a pair of internal electrodes are sealed inside both ends of a glass bulb, and the internal electrodes can be supplied with power from an external power source. The one hermetically sealed portion is hermetically sealed by a hermetic seal, and the hermetic seal is electrically connected to the adjacent internal electrode.

[0010]

[Embodiment of the invention]

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

In the embodiment of the present invention shown in FIG. 1, a phosphor coating 2 is formed on the inner wall surface of a glass bulb 1 formed in a straight tube shape, and a rare gas, a trace amount of mercury, or the like is formed inside. It's sealed. Inside the both ends of the glass bulb 1, a pair of internal electrodes 3a, 3b are provided oppositely and sealed. A spacer 5 is provided on the outside of one sealing portion 4b of the sealing portions 4a and 4b at both ends of the glass bulb 1. The lead-in wires 6a and 6b electrically connected to the internal electrodes 3a and 3b are led out to the outside from the sealing portions 4a and 4b in an airtight manner. The introduction line 6a extends from the sealing portion 4a along the tube axis direction of the glass bulb 1, and the introduction line 6b is connected by a spacer 5 and soldering 7 at a position outside the sealing portion 4b. . The exposed core wire 10 of the harness 9 is further connected to the soldering portion 7 with a half pad to supply power.

In the embodiment of the present invention shown in FIG. 2, one sealing portion 4b is sealed by a hermetic seal 8, and the internal electrode 3b and the sealing portion 4b by the hermetic seal 8 are connected by an introduction line 6b. It is electrically connected. The exposed core wire 10 of the harness 9 is directly connected to the hermetic seal 8 by soldering 11.

[0013]

[Effect of the invention]

 According to the first aspect of the invention, since the spacer is provided only on the outer side of the one sealing portion, the area of one sealing portion becomes large, and the heat at the time of soldering is radiated. There is no crack in the sealing portion, and since the other sealing portion can be freely moved, no force due to wiring or the like is applied, so that there is an effect that the wiring workability can be improved.

According to the second aspect of the present invention, since one sealing portion is sealed by the hermetic seal, the exposed core wire of the harness can be directly connected to the hermetic seal, and it is not necessary to pull the harness around. At the same time, there is an effect that the assembling workability of the liquid crystal display device is improved and a highly reliable product can be manufactured.

[Brief description of the drawings]

FIG. 1 is a partially cutaway view showing a usage state of a cold cathode discharge lamp in which a spacer is provided on one sealing portion.

FIG. 2 is a partially cutaway view showing a usage state of a cold cathode discharge lamp in which one hermetically sealed portion is hermetically sealed.

FIG. 3 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 1 Glass bulb 3a, 3b Internal electrode 4a, 4b Sealing part 5 Spacer 6a, 6b Introducing wire 8 Hermetic seal

Claims (2)

[Utility model registration claims] 1. A pair of internal electrodes 3a, 3b are sealed inside both ends of a glass bulb 1, and lead-in wires 6a, 6b electrically connected to the internal electrodes 3a, 3b are located outside the glass bulb 1. In a cold cathode discharge lamp that is air-tightly drawn to the inside, a spacer 5 is provided outside one sealing portion 4b, and the spacer 5 and the internal electrode 3b are electrically connected to each other. Electric light. 2. A cold cathode discharge lamp in which a pair of internal electrodes 3a, 3b are sealed inside both ends of a glass bulb 1, and the internal electrodes 3a, 3b can be supplied with power from an external power source. The sealing portion 4b is sealed by the hermetic seal 8, and the hermetic seal 8 comes close to the internal electrode 3
A cold cathode discharge lamp characterized in that it is electrically connected to b.