JPH11250855A - Fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate electrode design even for a very thin lamp and to lengthen the service life of a low pressure discharge lamp by connecting a dumet wire to an outer lead wire and using an inner lead wire itself as an electrode member. SOLUTION: The inner wall of a glass tube 1 of a cathode lamp is coated with a phosphor 2. An inner lead wire also used as an electrode 4 is connected to a dumet wire 5 embedded in a sealing part and the dumet wire 5 is connected to an outer lead wire 6, by welding at each end of a glass tube 1. Several tens Torr rare gas and several mg of mercury are sealed within the glass tube 1. This lamp has simple structure for a very thin diameter tube capable of supplying current, and is easily formed as a thin diameter lamp, and the shape of an electrode is formed by simple work, for example, simply worked in a flat plate which is advantageous in degassing from the electrode by high frequency heating in the lamp manufacturing process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fluorescent lamp,
In particular, the present invention relates to an electrode of a cold cathode lamp used for information equipment such as a backlight for a liquid crystal.

[0002]

2. Description of the Related Art A hot cathode discharge lamp and a cold cathode discharge lamp are described in the Illumination Handbook (edited by
Moon, Ohmsha) on pages 759 to 960. The hot cathode fluorescent lamp is described on page 160 of the same document. The structure of the hot cathode is described on page 121 of the Lighting Handbook (November 1987, Ohmsha) edited by the Illuminating Engineering Institute of Japan.

[0003]

In the above-mentioned conventional hot-cathode type low-pressure discharge lamp, two leads connected to both ends of one electrode are required to heat the electrodes by energization. There is a drawback that the structure of the discharge tube becomes complicated. In particular, when the size of the discharge vessel is small, the above disadvantage is fatal. Further, the cold cathode type low-pressure discharge lamp has one lead wire per electrode, but has a drawback that the cathode drop voltage is high and the efficiency is low. Further, when the discharge current is 10 mA or more, there is a disadvantage that the life is short.

An object of the present invention is to simplify the structure of the pipe end,
An object of the present invention is to provide a low-pressure discharge lamp having high efficiency and long life.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a method for connecting a dumet wire embedded in a glass sealing portion to an outer lead wire of a lamp for supplying a current to the lamp, and further comprising an inner lead positioned inside the tube. Usually, an electrode member is connected to a lead wire by welding or the like to form an electrode.However, by using the inner lead wire itself as an electrode member, an electrode can be easily designed even with a very small diameter lamp, and the cost is also reduced. It is designed to be significantly cheaper.

The metal used for the electrode member includes:
Any material such as Ni, Ni-plated Fe, Al, Ta, Mo, and W may be used.

[0007] The shape is not limited to a bar, but may be a flat plate, a cylindrical shape, or the like.

The inner lead portion (in the case of a rod shape) in the lamp is used as it is as an electrode, the portion of the lamp member embedded in the glass is usually a dumet wire, and the outer lead wire outside the lamp is a dumet wire or copper. Lines and the like are common.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the structure of the cold cathode lamp of the present invention. A phosphor 2 is applied to the inner wall of the glass tube 1, and an inner lead wire 4 combined with an electrode is embedded at both ends in a dimet wire 5 and an outer lead wire 6 embedded in a sealing portion.
Are installed in a form connected by welding.
The tube has a structure in which a few tens of Torr of rare gas and a few mg of mercury 3 are sealed.

FIG. 2 is an enlarged view of the electrode portion.
The electrode 4, the dumet wire 5, and the outer lead wire (copper wire) are connected by welding.

FIG. 3 shows another embodiment in which the inner lead portion is crushed into a flat plate shape.

In this embodiment, an example is shown in which Ni is used as the electrode member, but Ni-plated Fe, Al, Mo, W, Ta
It was confirmed that there was no significant difference in performance regardless of what made of a heat-resistant metal such as (tantalum).

The electrode may have any shape as long as it can be easily processed as a metal.

According to the present invention, since the inner lead portion is used as an electrode as an electrode for an ultra-fine fluorescent lamp, an electrode having a simple structure and high efficiency can be easily supplied. Is an effective invention.

[0016]

According to the embodiment of the present invention, it is possible to supply an electrode having a simple structure for an extremely small diameter, so that the diameter can be easily reduced and the shape of the electrode portion can be easily processed. Because it can be, for example, when performing degassing from the electrode by high-frequency heating during lamp making, a flat plate is advantageous,
It is easy to work on the flat plate.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing the structure of a cold cathode lamp according to an embodiment of the present invention.

FIG. 2 is a perspective view of an electrode of the cold cathode lamp according to the embodiment of the present invention.

FIG. 3 is a front view and a side view of an electrode of a cold cathode lamp according to another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Glass tube, 2 ... Phosphor, 3 ... Mercury, 4 ... Electrode, 5 ...
Dumet wire, 6 ... outer lead wire.

Claims (2)

[Claims] 1. A cold-cathode fluorescent lamp having electrodes at both ends and in which mercury and a rare gas are sealed as an enclosure, an insert lead or an equivalent member connected to an outer lead passing current through the lamp is used as the electrode. A cold cathode fluorescent lamp formed by: 2. An information device having a fluorescent lamp in which an insert lead wire or an equivalent member connected to an outer lead wire for passing an electric current through the lamp directly forms an electrode.