CN2457735Y

CN2457735Y - No metal electrode cold cathode gas discharge device

Info

Publication number: CN2457735Y
Application number: CN 00235546
Authority: CN
Inventors: 葛世潮
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-05-29
Filing date: 2000-05-29
Publication date: 2001-10-31
Anticipated expiration: 2010-05-29

Abstract

The utility model relates to a no metal electrode cold cathode gas discharge device, which comprises a lamp tube, wherein, luminous powder is coated on the inner wall of the lamp tube; both ends of the lamp tube are sealed; discharge gas is filled in the lamp tube; a conductive layer and a metal cap or an electric connecting wire are arranged on outer wall of both ends of the lamp tube; a MgO layer is coated on the inner wall. After both ends are increased with proper AC voltage, the discharge gas generates discharge. The utility model has the characteristics of simple structure, high efficiency, long service life, etc. The no metal electrode cold cathode gas discharge device can be used for illumination, display, back illumination of liquid crystal display, ultraviolet lamps, etc.

Description

Cold-cathode gas discharge device without metallic electrode

The utility model relates to a kind of cold-cathode gas discharge device, particularly do not have the cold-cathode fluorescence lamp and the uviol lamp of metal electrode; Can be used for throwing light on, information shows and the back illumination of liquid crystal display etc.

The cold-cathode fluorescence lamp of prior art includes fluorescent tube at present, and inside pipe wall has luminescent powder, is filled with discharge gass such as mercury in the pipe, and two ends respectively have a metal electrode and lead-in wire thereof; When adding the ac high-voltage of 10～100KHz between electrode, promptly produce discharge and luminous between electrode.Now be widely used in the back illumination of liquid crystal display etc.

The principle that the cold-cathode fluorescence lamp of prior art utilizes cation bump negative electrode under near the high electric field the negative electrode quickens to produce secondary electron produces electronics, and electronics anode motion then makes gas discharge and produces luminous.This traditional structure, exist following deficiency: at first, cation bump negative electrode can make the cathodic metal sputter, and the metal meeting and the discharge gas that sputter out, mercury for example, be combined to mercury alloy, on lamp tube wall, mercury reduced gradually, promptly " eat up " mercury, can die of old age because of mercury exhausts at last; Second, cold-cathode discharge has higher voltage to fall near negative electrode, for example 130～150 volts, sizable electrical power consumed loss is promptly arranged on negative electrode, it causes cathode temperature to raise, because cathode area is little, the heat of negative electrode dissipates through radiation with after the low-pressure gas around the negative electrode is transmitted on the tube wall again, so the cathodic region temperature is very high, for example can reach more than 110 degrees centigrade, this causes negative electrode and fluorescent tube venting and whole light temperature is raise, and reduces working life; The 3rd metal electrode cost height, electrode will go between, and lead-in wire easily leaks slowly with glass sealing place and causes waste product, and operation is many, the cost height.

The purpose of this utility model is to overcome the deficiency of above-mentioned existence, and a kind of no metal electrode and lead-in wire thereof are provided, and does not have lead-in wire ... glass-sealed cold-cathode gas discharge device.

The purpose of this utility model is finished by following technical solution.A kind of cold-cathode gas discharge device without metallic electrode, it mainly includes a tubes, two ends of fluorescent tube are the vacuum seal end, in be filled with discharge gas, described fluorescent tube two end outer walls are provided with outer conducting layer, after adding the High Level AC Voltage of appropriate frequency between two conductive layers, discharge gas promptly produces gas discharge, to produce visible light or ultraviolet light.

Described fluorescent tube is made by Bohemian glass, soft glass or quartz glass, and the inwall of fluorescent tube is provided with luminous bisque, and the ultraviolet excited light-emitting powder that gas discharge produces is with the visible light of generation required color or the ultraviolet ray of required wavelength.

Described outer conducting layer is that electric conducting materials such as silver-colored slurry, tin oxide, tin indium oxide are made, and is provided with metal cap or lead-in wire outside it, is used for being connected with actuator electrical.

The inwall of described outer conducting layer place fluorescent tube is provided with the MgO protective layer, to increase time electron emissivity, reduces cathode drop and guard lamp tube wall.

The utility model also described outer conducting layer and fluorescent tube two sealed ends can be provided with one section dead end that does not discharge between at least one end, it is as the cold junction of electric discharge device.

Description of drawings is as follows:

Fig. 1 is the cross-sectional view of the cold-cathode fluorescence lamp of prior art;

Fig. 2 is the cross-sectional view of the cold-cathode gas discharge device of no metal electrode of the present utility model;

Fig. 3 is the cross-sectional view that the cold-cathode gas discharge device of no metal electrode of the present utility model has fluorescent tube one end of transparency conducting layer;

Fig. 4 is the cross-sectional view that the cold-cathode gas discharge device of no metal electrode of the present utility model has fluorescent tube one end of cold junction;

Below in conjunction with accompanying drawing the utility model is described in detail:

Fig. 1 is the cross-sectional view of the cold-cathode gas discharge lamp of prior art.Fluorescent tube 1 among the figure, luminous bisque 2 is arranged on its inwall, in be filled with discharge gass such as mercury, xenon, argon, neon, fluorescent tube two ends respectively have a metal electrode 3 and lead-out wire 4a and 4b, adding upper frequency when between 4a and 4b is 10～100KHz, and during the voltage of several hectovolts to 1 more than thousand volts, fluorescent tube promptly produces gas discharge, luminescent powder 2 on the ultraviolet ray excited lamp tube wall that gas discharge produces is to produce the visible light of required color.

Fig. 2 is the cross-sectional view of the cold-cathode gas discharge device of no metal electrode of the present utility model.5 is fluorescent tube among the figure, and two ends are vacuum seal end 6, are filled with discharge gass 7 such as mercury, xenon, neon, argon in the fluorescent tube, and luminous bisque 8 is arranged on the tube inner wall, and the outer wall of fluorescent tube two ends has conductive layer 9, and metal cap 10 or metal lead wire are arranged outside the conductive layer 9; Matcoveredn 11 on the tube inner wall at fluorescent tube two end conductive layers 9 places is made by materials such as MgO, is used to improve time electron emissivity, reduces cathode drop and guard lamp inside pipe wall.Between two end conductive layers 9, add 10～100KHz, during the alternating voltage of hundreds of to 1 more than thousand volt, this alternating current is capacitively coupled in the fluorescent tube through two end conductive layers 9 and tube inner wall formation, make gas generation discharge in the fluorescent tube, the size of described electric capacity is decided by the area of conductive layer 9, the wall thickness and the fluorescent tube material of this place's fluorescent tube, select these parameters, obtain required capacitance easily.Luminescent powder 8 on the ultraviolet ray excited lamp tube wall that gas discharge produces is with the visible light of generation required color or the ultraviolet ray of required wavelength.Luminescent powder 8 also can, i.e. visible light or ultraviolet ray directly produced by gas discharge, as uviol lamp.

Described fluorescent tube 5 can be straight or be curved definite shape, is made by Bohemian glass, soft glass or quartz glass, owing to connect airtight the no metal lead wire in place, technology is simple, the rate of finished products height during particularly with Bohemian glass or quartz glass, has been avoided metal ... glass-sealed difficulty.

Cold-cathode gas discharge device of the present utility model also can be an end for vacuum seal end 6, one ends of no metal electrode be the vacuum seal end that metal electrode 3 is arranged.

Described outer conducting layer 9 can be made by silver slurry or electric conducting materials such as other metal or carbon.Described outer conducting layer 9 also can be made up of transparency conducting layers such as tin oxide or tin indium oxide 12, as shown in Figure 3.And behind electric conducting materials 13 such as silver slurry, be electrically connected with metal cap or metal lead wire, being used to connect driving voltage, described transparency conducting layer can allow luminous 14 also outgoing of discharge generation in the electrode district 12, and at this moment luminous bisque 8 also can be arranged on the inwall of electrode district 12.

Can have in described two sealed ends 6 one section dead end 15 that does not produce gas discharge is arranged between at least one end and the outer conducting layer 9, as shown in Figure 4, be used to do the cold junction of electric discharge device, to improve its hot properties.

The utility model compared with prior art, have simple in structure, cost is low, the life-span is long, luminous The efficient high.

Claims

1, a kind of cold-cathode gas discharge device without metallic electrode, it includes a tubes (5), its two end is vacuum seal end (6), in be filled with discharge gas (7), it is characterized in that on described fluorescent tube (5) the two end outer walls outer conducting layer (9) being arranged.

2, cold-cathode gas discharge device without metallic electrode as claimed in claim 1 is characterized in that described fluorescent tube (5) made by Bohemian glass, soft glass or quartz glass, is shaped on luminous bisque (8) on the inwall of fluorescent tube.

3, cold-cathode gas discharge device without metallic electrode as claimed in claim 2, it is characterized in that the outer conducting layer (9) on described fluorescent tube (5) the two end outer walls is that electric conducting materials such as silver-colored slurry, tin oxide, tin indium oxide are made, it is outside equipped with metal cap (10) or lead-in wire.

4, cold-cathode gas discharge device without metallic electrode as claimed in claim 3 is characterized in that described outer conducting layer (9) locates the inwall of fluorescent tube and be provided with MgO protective layer (17).

5, cold-cathode gas discharge device without metallic electrode as claimed in claim 4 is characterized in that being provided with one section dead end that does not discharge (16) between at least one end in described outer conducting layer (9) and two sealed ends (6).

6, one sharp cold-cathode gas discharge device, it includes a tubes (5), one end is the vacuum seal end (6) of no metal electrode, one end is for there being the vacuum seal end of metal electrode (3), in be filled with discharge gas (7), it is characterized in that described fluorescent tube (5), outer conducting layer (9) is arranged on the one end outer wall, and an end has metal electrode (3).