KR20030045540A - A platelike electrodeless fluorescent lamp having linear micro hollow cathodes - Google Patents

Abstract

PURPOSE: A planar fluorescent lamp is provided to improve a luminosity by forming a plurality of micro hollows for generating electron oscillation by a linear manner to prepare a micro hollow cathode plate and increasing a plasma density in a fluorescent lamp via radiation from the micro hollow cathode. CONSTITUTION: A micro hollow cathode plate(10) comprises a micro hollow cathode(101) where a plurality of micro hollows(103) for generating electron oscillation are formed in a linear shape so as to increase the density of radiated ultraviolet rays. An anode plate(20) is placed with an opposite state at a spaced distance from the micro hollow cathode plate. A plasma gas is filled between the micro hollow cathode plate and the anode plate which are made airtightly. The micro hollow cathode plate further comprises glass and attachment metal(102) for forming a dielectric barrier by coating an outer part of the micro hollow cathode.

Description

A platelike electrodeless fluorescent lamp having linear micro hollow cathodes

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp. In detail, a plurality of micropores causing electron oscillation are formed in a linear form to prepare a microporous plate, and the plasma density in the fluorescent lamp is increased through radiation from the formed micropore. By providing a linear microporous cathode electrodeless plate fluorescent lamp with improved brightness.

Commonly used fluorescent lamps operate by putting two electrodes inside a glass tube and brightening them by encapsulating and discharging a plasma-generated mercury (Hg) or argon (Ar) gas.

These fluorescent tubes paint fluorescent material on the inner wall of the straight tube, form electrodes on both sides, charge emitters that emit hot electrons therein, and then vacuum the inside of the glass tube, followed by a small amount of mercury and argon gas. It is manufactured to be automatically turned on by enclosing and connecting a glow lamp to it.

However, a general fluorescent lamp has a problem in that a heating part is consumed by heat because it discharges hot electrons by heating the filament during discharge. In other words, if you use the fluorescent lamp for a long time, the thermal degradation phenomenon is blackened at both ends, and eventually there is a problem that can not be used because it is not discharged.

In addition, such a conventional fluorescent tube is not bright because the operating pressure is low because the amount of ionization is low and thus the intensity of ultraviolet rays discharged. In addition, fluorescent lamps commonly used are generally filled with mercury (Hg), which causes harmful pollution to the human body or nature and is not beneficial to the environment.

Conventional general straight fluorescent lamps also have a problem in that the utilization is limited due to the intuitive structure. That is, the fluorescent lamp is not only an intuitive form but also a flat plate (planar) form, but the current discharge structure is not only difficult to produce a fluorescent lamp of the planar form, there is a problem in operation even if produced in a planar form.

However, with the development of technology, a fluorescent lamp having a structure that can increase the efficiency of discharge is required, and also in terms of its own operation, it is necessary to increase the efficiency of plasma radiation to improve the brightness.

Accordingly, an object of the present invention for solving the above problems is to form a microporous plate by forming a plurality of micropores that cause electron oscillation (linear oscillation) in a linear form and plasma in the fluorescent lamp through the radiation from the formed micropore cathode The present invention provides an electrodeless flat plate fluorescent lamp that adopts the principle of linear microporous cathode, which has improved brightness by increasing density.

1 is a structural diagram of a linear microporous cathode fluorescent lamp according to an embodiment of the present invention.

2 is a partial cross-sectional view of FIG. 1.

FIG. 3 is a view for explaining a process acting on one micropore of FIGS. 1 and 2;

-Explanation of symbols for the main parts of the drawing-

10: microporous cathode plate

101: fine pore cathode 102: glass

103: micro hollow

20: positive plate

201: transparent dielectric 202: positive electrode (ITO electrode)

203: glass plate 204: fluorescent material

In order to achieve the above object, the electrodeless plate fluorescent lamp using the principle of the linear microcavity cathode of the present invention has a plurality of microcavities that cause electron vibration to increase the density of emitted ultraviolet rays. A microporous negative electrode plate including a microporous cathode, and a positive electrode plate disposed in a facing state at a predetermined distance from the microporous negative electrode plate and fluorescing by a fluorescent material applied to a surface thereof, wherein a plasma gas is filled between the microporous negative electrode plate and the positive electrode plate. It is characterized by being sealed in a state.

Hereinafter, a linear microporous cathode fluorescent lamp according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a structural diagram of a linear microporous cathode fluorescent lamp according to an embodiment of the present invention, Figure 2 is a partial cross-sectional view of FIG. 3 is a view for explaining a process that operates in the microporous cathode of FIGS. 1 and 2.

The electrodeless flat panel fluorescent lamp adopting the principle of the linear microporous cathode proposed by the present invention is an electrodeless structure in which an electrode used to generate plasma in the fluorescent lamp does not exist in the fluorescent lamp. At the same time, in order to generate high frequency discharges in the range of tens of KHz to several tens of MHz, the capacitive coupled discharge, in which two pole plates face each other, causes the vibration of electrons between the two pole plates and causes the fluorescence process. Will be used. In other words, the present invention adopts a microporous structure while taking a kind of dielectric barrier discharge as a basic concept.

Therefore, the present embodiment adopts the concept of a microporous structure using a metal while applying a glass serving as a dielectric to the outside of the micropores to lower the cathode voltage, and avoid high current density and at the same time by using a high frequency (high frequency) It has a structure that can increase efficiency. In addition, the electrode is present in the outside of the sealed space in which the discharge occurs, thereby exhibiting the effect that the electrode is degraded by the discharge due to long-term use.

As shown in Figures 1 to 3, the linear microporous flat plate fluorescent lamp of this embodiment can be largely divided into a microporous cathode plate 10 and a positive electrode plate 20.

The microporous cathode plate 10 is formed of a metallic microporous electrode 101 to which power is applied. The glass 102 is molded into a linear micropore shape in the microporous cathode 101. In the microporous electrode 101, a plurality of microcavities 103 are formed. The microporous cathode plate 10 is formed by drilling a small hole in the glass of the plate so that a part of the thickness of the microporous cathode plate 10 is pi and applying a metal 102 thereto.

Such a number of micropores 103 can be formed in various shapes of an array that can enhance the efficiency of plasma discharge as well as the arrangement of FIG. 1.

On the positive electrode plate 20, a dielectric 201, a positive electrode 202, and a glass plate 203 are formed, respectively, and a fluorescent substance 204 is coated on the glass plate 203.

Here, the dielectric 201 insulates the outside of the flat fluorescent lamp, and the positive electrode 202 in contact with the dielectric 201 is applied with a power source corresponding to the microcavity plate 10. The glass plate 203 formed on the rear surface of the positive electrode 202 forms a frame of the plate-shaped body of the flat fluorescent lamp, and the fluorescent material 204 is coated.

It is sealed between the microporous negative electrode plate 10 and the positive electrode plate 20 with the plasma gas filled therein.

When power is applied to the linear microporous cathode fluorescent lamp of the present embodiment, electrons vibrate within the microcavity 103 due to a penal effect. Therefore, collision with the plasma gas molecules in the microcavity 103 increases, and thus ionization is increased. In addition, due to the structural shape of the micro voids 103, the loss of charged particles is reduced, thereby lowering the breakdown voltage to have high efficiency.

As described above, the present embodiment has a structure of a dielectric barrier discharge in which the dielectric material 102 is applied to the surface of the microcavity 101 which is the electrode which causes the discharge. This structure is also related to an electrodeless structure in which no electrode is present in a sealed tube.

In addition, in the present embodiment, while taking this concept, the plasma density in the fluorescent lamp is increased by drilling a linear micro-pore 103 having a volume capable of causing electron oscillation to a general plate cathode. It is a structure that can increase and thus increase the amount of ultraviolet light.

At this time, the size of the linear micro-pores 103 is formed to an appropriate size that can cause electromagnetic vibration. That is, in order to effectively generate electromagnetic vibration, the conditions of "pressure x diameter (p-D)" are determined according to the Pachen curve representing the minimum discharge start voltage, thereby forming the structure of the microcavity.

In the present embodiment, the electrons present in each of the micropores 103 are accelerated by the cathode drops existing symmetrically to ionize and excite the neutral state gas therein. In this process, the electrons inside the microcavity 103 generate a strong vibration and are accelerated by the voltage drop applied to the microporous negative electrode plate 10 and the positive electrode plate 20 and then formed on the surface of the positive electrode plate 20. 204 and the efficiency of fluorescence and light emission are increased. In addition, the amount of ultraviolet rays generated by being excited and ionized in the micropores also increases.

As a result, in the present embodiment, the electrons emitted from the microcavity 103 of the microcavity 101 cause electron oscillation, thereby greatly increasing the plasma density in the fluorescent lamp and eventually increasing the amount of ultraviolet rays. The plasma density in the void 103 is higher than the conventional plasma density using the filament.

In the present embodiment, a phosphor is used as the phosphor 204. The fluorescent material (B) is a portion that is fluorescent by ultraviolet light generated by being excited and ionized in the flat fluorescent lamp.

The positive electrode 202 outside the glass plate 203 is a portion to which a positive potential having a higher potential difference than the negative potential is applied to correspond to the negative potential of the microcavity 101. Since the present invention is related to a fluorescent lamp, a material capable of shining internally fluorescence well to the outside is preferable, and in this embodiment, ITO (Indium Thin Oxide), which is a transparent electrode material, is used. The dielectric 201 is formed outside the positive electrode 202. The dielectric 201 is applied to the outermost part for insulation from the outside of the flat fluorescent lamp of this embodiment. Therefore, the flat fluorescent lamp of the present invention is a fluorescent lamp having an electrodeless structure having no electrode inside the lamp.

In this embodiment, regardless of the type of power supply such as direct current or alternating current, high efficiency fluorescence is performed. When an alternating current is applied to an embodiment of the present invention, the potential of the microcavity 101 may be higher than the potential of the positive electrode 202. Even at this time, the electrons do not stop oscillating in the microcavity. Fluorescence persists. In addition, in the present invention, it is also preferable to use a high frequency power source in the form of RF (Radio Frequency) as well as general alternating current. In this case, since the electromagnetic vibration is increased, very strong fluorescent light can be generated.

As described above, in the present invention, since the electrode for generating plasma becomes an electrodeless structure that does not exist in the fluorescent lamp to prevent thermal degradation of the electrode, the lifetime of the fluorescent lamp is increased and high frequency is avoided while avoiding high current density. It is a highly efficient structure that can be used.

Arranges a variety of microporous cathode structures with various types of arrangements, and the applied power source can also be used for RF power in the tens of KHz to several tens of MHz in addition to direct current or alternating current. It can change and implement.

The present invention, unlike the conventional fluorescent tube of the straight tube type, adopts an electrode having a micro-porous structure therein and increases the density and efficiency of the plasma generated therein to provide improved brightness while being used in LCD backlights, homes and offices. To provide a high-efficiency flat fluorescent lamp that can be applied to a variety of lights, billboards, special lighting.

The microporous cathode flat plate fluorescent lamp of the present invention is expected to be used in various fields of the industry to raise the technology of fluorescence and light emission to the next level.

Claims (3)

A microporous negative electrode plate including a microporous cathode in which a plurality of microcavities causing electron vibrations are formed in a linear form so as to increase the density of the emitted ultraviolet rays; And It includes a positive electrode plate which is located in a facing state at a predetermined distance from the microporous negative electrode plate and fluorescing by the fluorescent material applied to the surface, Between the microporous cathode plate and the anode plate is sealed with a plasma gas filled, linear microporous cathode fluorescent lamp. The method of claim 1, wherein the microporous negative electrode plate A plurality of micropores formed in a linear shape with a plurality of micropores and configured to apply power; And And a glass and an adhesion metal which coats the outside of the microporous cathode to form a dielectric barrier. The method of claim 1, wherein the positive electrode plate Dielectric for isolation from the outside; A positive electrode formed on a rear surface of the dielectric and configured to apply power; And And a glass plate formed on the rear surface of the positive electrode to form a frame of the tubular body of the flat fluorescent lamp and to which a fluorescent material is applied.