TW201303957A - Cold cathode fluorescent lamp for illumination - Google Patents

Abstract

Provided is a cold cathode fluorescent lamp (CCFL) that can be used as an illumination light source. The CCFL includes cold cathode electrodes disposed at both ends of a glass tube, a fluorescent layer being formed on an inner surface of the glass tube. Each of the cold cathode electrodes includes: a base metal connected to front ends of lead wires for connection with a power source; a helical wire coil formed by helically winding a tungsten or tungsten-alloy wire around a cup shape, the helical wire coil being connected to the base metal in a manner such that the helical wire coil is erected in a length direction of the glass tube; and an emitter--coated coil inserted in the helical wire coil and coated with an emitter for inducing emission of electrons.

Description

Cold cathode fluorescent lamp for lighting

The present invention relates to a cold cathode fluorescent lamp that can be used for illumination, and more particularly to a high efficiency long life cold cathode fluorescent lamp (HCL) for illumination, which is improved only by LCD in the prior art. The tube current, light efficiency, brightness, and lifetime of a cold cathode fluorescent lamp such as a display backlight, a facsimile machine, or the like, and an eraser of a copying machine, are used for illumination.

The prior art cold cathode fluorescent lamp (CCFL: Cold Cathode Fluorescent Lamp) can obtain the required brightness with only 4 to 5 mA of tube current, and is used as a backlight for LCD displays, a reading source for a facsimile machine, etc. Light source such as a divider. The cold cathode fluorescent lamp used for the above purpose has a cup-shaped electrode at both ends of the glass tube, and a phosphor layer is formed inside the glass tube by using a fluorescent substance. Further, a rare gas such as helium gas, argon gas or helium gas and a trace amount of mercury are sealed in the glass tube. If a high voltage is applied to the cup electrodes at both ends of the glass tube, a small amount of electrons present in the glass tube ionize the rare gas enclosed, and the ionized rare gas strikes the cup electrode, which will emit radiation at the cup electrode. a secondary electron (which is called a glow discharge), and the emitted secondary electrons collide with mercury to emit ultraviolet light from the mercury. Then, the ultraviolet light emitted from the mercury irradiates the fluorescent layer provided on the inner wall of the glass tube. Fluorescent substances emit visible light. As described above, the tube current inside the glass tube is about 4 to 5 mA. However, if the illuminance for illumination is to be obtained from a cold cathode fluorescent lamp, the tube current needs to be 10 mA or more.

In the prior art, the electrodes of the cold cathode fluorescent lamp focus on the shape of a cup formed to increase the internal area. In addition, the electrode material mainly uses nickel (Ni). Since nickel has a relatively low melting point and good formability, it is easily formed into a cup shape. However, nickel or nickel alloys have disadvantages such as high escape function and high sputtering coefficient. In order to improve the sputtering resistance, although a nickel alloy cup electrode formed by using a niobium (Nb) or niobium (Y) alloy is used, in the case of a nickel alloy material electrode, if the tube current is increased to 10 mA, too much sputtering is caused. And shorten the life. Sputtering can generate excessive heat at the electrode, significantly lowering the speed of light, and forming a sputtered film on the inner wall of the glass tube, making it difficult to obtain the illuminance required for illumination. Therefore, the nickel or nickel alloy material electrode is not suitable for a cold cathode fluorescent lamp having a tube current higher than 5 mA, and it is difficult to realize a cold cathode fluorescent lamp for illumination by using a cup-shaped nickel electrode or a cup-shaped nickel alloy electrode.

Moreover, in the prior art, since the increase in area is the focus, the size of the electrode is too large. If the size of the electrode is too large, the area occupied by the electrode in the glass tube is too large, thereby shortening the anode portion, reducing the speed of light and increasing the energy consumption, which is one of the reasons why the cold cathode fluorescent lamp is not suitable for illumination. .

A first object of the present invention is to provide a cold cathode fluorescent lamp for illumination which overcomes the above problems in the use of a cold cathode fluorescent lamp as a general illumination, which can utilize tungsten or tungsten having a low sputtering coefficient and a function of escaping The alloy forms a cold cathode electrode and is easily formed into a cup shape.

A second object of the present invention is to provide a cold cathode fluorescent lamp for illumination which can increase the brightness as much as possible while minimizing the length of the electrode.

A third object of the present invention is to provide a cold cathode fluorescent lamp for illumination which can easily mount a two-wire wire inserted or withdrawn from a general hot cathode fluorescent lamp socket.

A fourth object of the present invention is to provide a cold cathode fluorescent lamp for illumination which can extend the life of an electrode by reducing a discharge sustaining voltage.

A fifth object of the present invention is to provide a cold cathode fluorescent lamp for illumination which is easy to perform emitter coating and maintenance.

In order to achieve the above first and second objects of the present invention, a cold cathode electrode for a cold cathode fluorescent lamp for illumination includes: a base metal bonded to a front end of a lead wire for introducing a power source; a wire spiral straight stereo, a tungsten or a tungsten alloy a wire is wound in a cup-shaped body in a helical structure and connected upright on the base metal in the direction of the glass tube; and an emitter coating coil is inserted into the spiral straight body inside the wire to be on the surface thereof The emitter is coated to cause the output of the electrons to correspond to the feng shui information of each menu.

In order to achieve the above third object of the present invention, the above-mentioned wires are connected to each other and the two wires are electrically short-circuited on the base metal.

In order to achieve the above fourth object of the present invention, after the above-mentioned emitter coating coil is formed by a thin tungsten or tungsten alloy thin wire which is thinner than the above-mentioned wire, the surface of the fine wire is coated with cerium oxide, cerium oxide, cerium oxide, cerium oxide or One or more emitters selected from magnesium oxide.

In order to achieve the fifth object of the present invention, the emitter coating coil is formed by forming a thin wire coil with a tungsten or tungsten alloy thin wire thinner than the wire, and then winding the thin wire coil into a spiral shape to form a spiral structure of the thin wire coil. And coating one or two or more emitters selected from the group consisting of cerium oxide, cerium oxide, cerium oxide, cerium oxide or magnesium oxide on the surface of the fine wire coil.

According to the present invention having the above-described configuration, since the double coil structure of tungsten or tungsten alloy is provided, even when the tube current is 10 mA or more, the sputtering resistance can be maintained while the low-emission function is high-luminance. Fully radiate electrons while minimizing electrode length; by providing a base metal between the wire and the wire spiral straight, it is easy to form a two-wire wire that can be inserted or pulled out of a general hot cathode fluorescent lamp socket; The emitter coating coil is used as an internal coil, and the secondary electron emission can be completed at a reduced voltage, thereby reducing the discharge sustaining voltage and prolonging the life of the electrode; the internal coil is formed by winding a thin wire coil with a tungsten thin wire, and then winding the thin wire coil into a spiral shape. The spiral structure is coated with an emitter on its surface so that the emitter can be easily coated and maintained.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, as shown in FIGS. 4 and 5, in the present invention, a cold cathode electrode having a low sputtering coefficient, a low starting voltage, and a low discharge sustaining voltage is used at both ends of a glass tube formed inside the phosphor layer. Thus, a cold cathode fluorescent lamp can be used for illumination. A cold cathode fluorescent lamp for illumination according to the present invention includes a glass tube 17 having a phosphor layer formed of a fluorescent material on an inner wall thereof, and a pair of cold cathode electrodes 1 opposed to each other at both ends of the glass tube. A high voltage is alternately applied to the cold cathode electrodes 1 at both ends to emit electrons from the electrodes. The present invention is characterized in that the cold cathode electrode 1 is improved to improve sputtering resistance, and a large amount of electrons (Table mA or more) required for illumination are formed by a low discharge starting voltage and a discharge sustaining voltage, so that a cold cathode can be used. Fluorescent lights are used for lighting.

The emitter coating coil which is the most characteristic feature of the present invention will be described with reference to Fig. 1. As shown in Fig. 1, the emitter coating coil 21 of the present invention not only has a structure of an emitter 5 which is easy to apply a powder state, but also has a retained emission. The pole 5 has a structure that does not make it detached for a long time. That is, a preferred embodiment of the emitter coating coil 21 of the present invention, as shown in FIG. 1, is made of a thin tungsten or tungsten alloy thin wire which is thinner than the wire provided outside the emitter coating coil (mark 3 of FIG. 2). After the fine wire coil 19 is formed (the optimum diameter is 0.02 mm to 0.05 mm), the thin wire coil 19 is wound into a spiral shape to form a helical structure of the thin wire coil 19. The emitter is selected from one or more selected from the group consisting of cerium oxide, cerium oxide, calcium cerium oxide, cerium oxide or magnesium oxide in a powder state. In order to facilitate electron emission, the present invention selects the material with the lowest escape function as the emitter. The lower the escape function, the easier the electron emission is, which means that the discharge is easy. To successfully complete the coating of the emitter, carbon nanotubes can be used. At this time, carbon nanotubes were dispersed in an appropriate amount of water and isopropyl alcohol and dispersed with sodium dodecylbenzenesulfonate as a surfactant to be used as a coating agent. When the emitter coating coil 21 is configured as described above, the length of the entire wire of the emitter coating coil is increased, and electrons of 10 mA or more are emitted at a low voltage in a narrow space, and the thin wire coils 19 are closely laminated when the emitter is applied. The gap between the thin coils is coated with an emitter to facilitate coating of the emitter 5, and further, after the emitter is applied, the coated emitter 5 is not detached for a long time, prolonging the life of the electrode.

The emitter coating coil is wound without forming the thin wire coil 19 in advance, and is wound by a straight thin wire (optimum diameter of 0.02 mm to 0.05 mm) of a tungsten or tungsten alloy thinner than the above-mentioned wire. At this time, one or two or more emitters selected from the group consisting of cerium oxide, cerium oxide, cerium oxide lanthanum oxide, cerium oxide or magnesium oxide are also applied to the surface of the fine line. However, when the emitter is coated in such a manner, it is more difficult to use the thin wire coil 19, and the emitter coating holding time is also shorter.

As shown in FIGS. 2 and 3, another feature of the present invention is to provide a wire spiral straight body 3. The wire spiral straight stereo 3 is wound with a tungsten or tungsten alloy wire (preferably having a diameter of 0.2 mm to 0.5 mm) in a cup-shaped main body shape as a helical structure, and along the length of the glass tube on the base metal. The direction is erect. The cold cathode electrode 1 of the present invention is bonded to the base metal 7 at the leading end of the wires 9a, 9b to which the power source is introduced. The above-mentioned wires 9a, 9b are selected from the Dumei line or the Koval line. The wires 9a, 9b are arranged perpendicular to the base metal 7. The wire spiral straight body 3 is erected on the base metal 7 in the opposite direction to the wires 9a, 9b. The present invention can utilize two wires for a general fluorescent lamp socket, and therefore, the above-mentioned base metal 7 has a special meaning. The base metal 7 firmly fixes the wire spirally straight at both ends so as to stand upright in the direction of the glass tube, and it is easy to connect two wires (Dumet wire or Kovar wire) to the above. Wire spiral straight stereo 3. Therefore, the above-mentioned base metal is required to be a material which can be welded to the above-mentioned wire spiral straight 3 and the wire (Dumei wire or Kovar line). The base metal 7 described above may be formed in a rod shape or a bead shape. When the material of the base metal 7 is made of tungsten or a tungsten alloy, since it has a high melting point, it can be welded to a wire formed by a tungsten or a tungsten alloy. Therefore, the material of the base metal 7 is preferably nickel or a nickel alloy. The wire spiral straight 3 can be electrically connected to each other by spot welding or the like to be bonded to one surface of the base metal 7. The wires 9a, 9b are connected to each other and electrically shorted to each other on the base metal. The wires 9a, 9b are provided in the opposite direction to the wire spiral straight 3 to be connected to an external power source.

As shown in FIG. 2, both ends of the wire constituting the wire spiral straight body 3 are drawn out to the base metal 7, wherein the wire drawn from the upper end of the wire spiral straight 3 passes through the wire spiral straight 3, and the above-mentioned emission The pole coating coil 21 is inserted therein. Thus, the emitter coating coil 21 is not detached from the wire spiral straight body 3. The terminal of the emitter coating coil 21 may be soldered to the base metal 7, but may not be soldered. In FIG. 2 or FIG. 3, the case where one emitter coating coil 21 is built in the inside of the wire spiral straight stereo 3 is shown, but other emitter coating coils may be built in the emitter coating coil, and two The above-described emitter coating coils 21 are disposed adjacent to each other without overlapping. In this way, the amount of electron emission can be increased at a low voltage without increasing the length of the electrode, thereby obtaining high luminance suitable for illumination without sacrificing the anode region.

As shown in FIGS. 3 and 4, the wires 9a and 9b are welded to the glass rod 11 and joined to the glass tube 17 through the glass rod 11. The glass fusing is a method of fusing the wires 9a and 9b of the cold cathode electrode 1 and the gas injection pipe 15 inside the glass rod 11, and then welding the glass at the upper end of the glass rod 11, and forming glass beads at the joint portion. Thus, the sealing between the glass tubes 17 and the wires 9a, 9b of the cold cathode electrode 1 is easily completed.

One of the points of the present invention is that although tungsten or tungsten alloy is difficult to plastically process, it has low formability and is difficult to form into a cup electrode, but it is easily formed into a coil shape after being drawn into a wire, and is formed by laminating a plurality of layers. When coils of different diameters are formed, a cup electrode having a low sputtering coefficient and a low escape function can be formed.

As described above, the present invention molds the above-mentioned wire spiral straight stereo 3 with a tungsten or tungsten alloy having a small sputtering coefficient and a small escape function, thereby increasing the life of the fluorescent lamp and starting the initial discharge with a low starting voltage. Further, by providing an emitter coating coil inside the wire spiral straight stereo 3, discharge (electron emission) of an amount (10 mA or more) required for illumination is maintained at a low voltage in a normal state.

As shown in FIGS. 4 and 5, the cold cathode fluorescent lamp alternately applies a voltage across the electrode 1, thereby emitting electrons through the electric field at the electrode, and the electron emission occurs not by heat but by an electric field, and therefore, heat is not required. . At the beginning, a small amount of electrons remaining inside the glass tube 17 collide with the electrodes to start emitting electrons at the electrodes, and once the electrons start to emit, the emitted electrons again collide with the electrodes and continue to discharge. By the above discharge, the electrons attracted by the anode collide with the mercury present in the glass tube to emit ultraviolet rays, and the ultraviolet rays excite the fluorescent layer of the glass tube 17, so that the fluorescent layer of the glass tube 17 emits visible light. Therefore, in order to simultaneously satisfy the requirements of high brightness and long life, it is necessary to easily complete electron emission as in the present invention. In the present invention, the electrode material is selected from tungsten (W) having the highest melting point than the escape function, and in consideration of the difficulty in plastic working of tungsten, it is made into a wire and wound into a spiral shape. The wound coils emit electrons on all surfaces. Therefore, when the tungsten (W) is formed into a spiral shape, as shown in the figure, the coil diameter is sufficiently large and the winding wires are tightly coupled, when the emitter coating coil is built in the inside thereof, The electron emission area is larger than the cup electrode. When the electrons in the lamp tube for illumination collide with the electrode, the energy is 10 eV or more, and the energy is very large. Therefore, in order to realize the cold cathode fluorescent lamp for illumination, tungsten (W) is used as the material of the electrode, and The shape is shaped into a spiral to increase the electron emission area. However, only tungsten is wound into a spiral shape, and since the discharge sustaining voltage is high and the amount of discharge is not large, it is difficult to use for illumination. However, as in the present invention, the emitter-coated lower ring in which the emitter is coated is inserted into the spiral straight body of the tungsten or tungsten alloy material wire, and the discharge maintaining voltage is lowered, and the tube of 10 mA or more required for illumination is easily obtained. Current.

1. . . Cold cathode electrode

3. . . Wire spiral straight

5. . . Emitter

7. . . Base metal

9a, 9b. . . wire

11. . . Glass rod

12. . . Wire glass assembly table

13. . . Glass welding

15. . . Gas injection pipe

17. . . Glass tube

19. . . Thin wire coil

twenty one. . . Emitter coated coil

twenty three. . . cover

25. . . Insulator

1 is a schematic view of an emitter coating coil of the present invention;

2 is a schematic view showing the separation of the cold cathode electrode of the present invention;

3 is a schematic view showing the combination of the cold cathode electrodes of the present invention;

Figure 4 is a schematic view showing a state in which the cold cathode electrode of the present invention is inserted into a glass tube;

Fig. 5 is a partially cutaway sectional view showing a cold cathode fluorescent lamp for illumination according to the present invention.

5. . . Emitter

19. . . Thin wire coil

twenty one. . . Emitter coated coil

Claims (4)

A cold cathode electrode for a cold cathode fluorescent lamp for illumination, in which a cold cathode fluorescent lamp for emitting a cold cathode electrode for emitting electrons is provided at both ends of a glass tube having a fluorescent layer formed on an inner wall thereof, comprising: a base metal, combined a wire leading to the front end of the lead wire; the wire is spirally straight, and the tungsten or tungsten alloy wire is wound in a spiral structure along a body of the cup shape and is erected on the base metal in the direction of the glass tube; And an emitter coating coil, which is inserted into the spiral straight inside of the above-mentioned wire and coated with an emitter on the surface thereof to cause the output of the electron to correspond to the feng shui information of each menu. A cold cathode electrode for a cold cathode fluorescent lamp for illumination according to claim 1, wherein the two wires are connected to each other and the two wires are electrically short-circuited on the base metal. The cold cathode electrode of the cold cathode fluorescent lamp for illumination according to the first aspect of the invention, characterized in that both ends of the wire constituting the wire spiral straight 3 are drawn out to the base metal 7, wherein the wire is drawn. The wire drawn from the upper end of the spiral straight 3 is passed through the inside of the wire straight stereo 3, and the above-mentioned emitter coating coil 21 is inserted therein. The cold cathode electrode of the cold cathode fluorescent lamp for illumination according to claim 1, wherein the emitter coating coil is formed by forming a thin wire coil with a thin tungsten or tungsten alloy thin wire which is thinner than the wire. The thin wire coil is wound into a spiral shape to form a spiral structure of the thin wire coil, and one or more types of emission selected from the group consisting of cerium oxide, cerium oxide, strontium oxide, cerium oxide or magnesium oxide are coated on the surface of the thin wire coil. pole.