WO2010020129A1

WO2010020129A1 - Gas discharge lamp with guiding electrodes

Info

Publication number: WO2010020129A1
Application number: PCT/CN2009/071819
Authority: WO
Inventors: 周立理; 周立行
Original assignee: Chow Lap Lee; Chow Lap Hang
Priority date: 2008-08-18
Filing date: 2009-05-15
Publication date: 2010-02-25
Also published as: CN101656189A

Abstract

A gas discharge lamp includes a lamp tube that has discharge electrodes at the ends of the lamp tube. Ballast is connected to the discharge electrodes and a power supply. The lamp also includes guiding electrodes that are set in the inner wall of the lamp tube. The ends of the guiding electrodes are set nearby the discharge electrodes. The discharge current path between two ends of the discharge electrodes can be greatly shortened and the need for instantaneous high-voltage discharge is avoided by using the guiding electrodes during the start process of the discharge lamp. A hot cathode start can be changed to a cold cathode start, and working life of the lamp can be effectively improved. In addition, a traditional starter of the lamp can be avoided, and the frequent replacement problem due to start damage can be eliminated. The daily maintenance of the discharge lamp becomes more convenient.

Description

Gas discharge lamp with built-in guiding pole

The present invention relates to a gas discharge lamp, and more particularly to a gas discharge lamp in which a guide electrode is disposed inside a lamp tube. Background technique

A conventional gas discharge lamp using an inductive ballast such as a fluorescent lamp, as shown in Fig. 1, is mainly composed of a lamp tube starter S, a ballast L, and the like. When the switch K is closed, the power supply voltage is applied between the two poles of the starter to discharge the helium gas in the starter and emit a glow. The heat generated by the glow causes the u-shaped moving contact piece in the starter to expand and expand into contact with the static contact piece, so that the current is passed through the ballast coil and the cathode of the lamp tube. After the current flows, the helium in the starter stops discharging, and the u-shaped moving contact is cooled and contracted, and then separated from the static contact, and the starter circuit is automatically disconnected. At the moment when the starter circuit is suddenly disconnected, due to the sharp decrease in the current of the ballast, a high self-induced electromotive force is generated, and an instantaneous high voltage is applied to both ends of the lamp. The mercury vapor in the lamp starts to discharge after the high voltage is excited, so that the passage of the inside of the lamp as a current starts to emit light. After the fluorescent lamp starts to emit light, the self-induced electromotive force in the coil of the self-inductance phenomenon hinders the change of the current and acts as a step-down, so that the voltage across the lamp tube is maintained at a low voltage to meet the normal working requirements.

However, since the starting process of the above gas discharge lamp is a high voltage starting, it is a hot cathode starting, so that the frequent heating of the cathode is liable to be damaged, and the service life of the discharge lamp is shortened. Moreover, the starter is also a component that is easily damaged and needs to be replaced frequently. Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to overcome the deficiencies of the prior art and to provide a long-life gas discharge lamp with a built-in guiding pole.

According to an aspect of the invention, a gas discharge lamp is provided, comprising:

a lamp tube, a discharge electrode disposed at both ends of the lamp tube, and a ballast connected between the discharge electrode and the power source, the gas discharge lamp further comprising a built-in guide electrode disposed near the inner wall of the lamp tube, the built-in guide The end of the lead is adjacent to the discharge electrode.

In the gas discharge lamp as described above, the built-in guiding electrode includes an auxiliary electrode provided at the built-in guiding tip portion and opposed to the discharge electrode.

In the gas discharge lamp as described above, the end of the built-in guiding pole is connected to the ballast circuit via an impedance element.

In the gas discharge lamp as described above, the built-in guiding electrode includes a first built-in guiding electrode and a second built-in guiding electrode, and the impedance element includes a first impedance element and a second impedance element, and the first built-in guiding electrode a discharge electrode having an end portion adjacent to the first end of the lamp tube, a second end portion of the first built-in guide electrode being connected to the ballast circuit via a first impedance element; a first end of the second built-in guide electrode A discharge electrode adjacent to the second end of the lamp, and a second end of the second internal guide is connected to the ballast circuit via a second impedance element.

In the gas discharge lamp as described above, the impedance element is at least one of a capacitor, an inductor, and a resistor. In the gas discharge lamp as described above, the distance between the end portion of the built-in guiding electrode and the discharge electrode is 2 to 10 mm.

In the gas discharge lamp as described above, the distance between the auxiliary electrode having the built-in guiding electrode and the discharge electrode is 2 to 10 mm.

A gas discharge lamp as described above, wherein the gas discharge lamp is a daylight lamp in which a phosphor powder is coated on an inner wall of the tube.

The gas discharge lamp as described above, wherein the gas discharge lamp is an ultraviolet lamp, an infrared lamp, a high-pressure gas discharge lamp or an arc lamp in which the inner wall of the lamp tube is not coated with phosphor.

The gas discharge lamp as described above further includes a capacitor disposed in parallel with the discharge electrode at both ends of the tube.

In the gas discharge lamp as described above, at least a portion of the connecting line connecting the capacitor to the discharge electrode is disposed inside the bulb.

The gas discharge lamp as described above, the connecting wire disposed inside the bulb encloses the glass.

According to the gas discharge lamp of the present invention, since the built-in guiding electrode is used, the discharge current path between the discharge electrodes at both ends of the lamp tube is greatly shortened during the starting of the discharge lamp, eliminating the need for instantaneous high-voltage discharge, and the hot cathode starting For cold cathode starting, the working life of the discharge lamp is effectively improved. And put The lamp eliminates the need for a conventional starter, eliminating the need for frequent replacement due to damage to the starter, making routine maintenance of the discharge lamp more convenient. DRAWINGS

The built-in guide electrode gas discharge lamp of the present invention will be described in detail below with reference to the accompanying drawings and embodiments. The same reference numbers in the drawings denote the same or similar elements or components. The above and other objects, features and advantages of the present invention will become more apparent from

Fig. 1 is a schematic view showing a starting process of a conventional gas discharge lamp.

2 is a schematic view showing a gas discharge lamp in accordance with an embodiment of the present invention.

3A and 3B are schematic views respectively showing a gas discharge lamp according to another embodiment of the present invention. Figure 4 is a schematic view showing a gas discharge lamp in accordance with another embodiment of the present invention.

Figure 5 is a schematic view showing a gas discharge lamp in accordance with another embodiment of the present invention.

6A and 6B are respectively schematic views showing a gas discharge lamp according to another embodiment of the present invention. detailed description

2 is a schematic view showing a gas discharge lamp in accordance with an embodiment of the present invention. Referring to FIG. 2, the two lead wires of the discharge electrode e at the end of the lamp tube are connected in a short circuit in the cap of the lamp tube end, and the built-in guide pole P is disposed near the inner wall of the lamp tube M, and the ends of the two ends are respectively close to each other. Discharge electrode e at both ends of the tube. The guiding pole is composed, for example, of a nickel piece, a magnesium wire, a molybdenum, a tungsten or other metal material, and the two ends are disposed toward the discharge electrode, for example, with an extension section disposed adjacent to the latter, and the spacing between the two is, for example, when the power supply voltage is 220. The volts, the power frequency is 50 Hz or 60 Hz, the inner diameter of the discharge lamp is about 17 mm, and the length is about 2. 2 m, which may be 2 to 10 mm, preferably 3 to 5 mm. The body of the guiding pole is fixed to the inner wall of the tube, for example, with glass beads g. When the switch K is closed, a power supply voltage is applied to the discharge electrodes at both ends of the lamp. The discharge electrodes at both ends instantaneously shorten the discharge distance by means of the guide poles, so that a part of the current flows along the guide pole (having a shunting action) inside the bulb. The continuous discharge between the discharge electrode and the extension of the guide pole excites the discharge of mercury vapor in the tube, thereby causing the gas discharge lamp to enter a normal working state. According to the gas discharge lamp of this embodiment, it is not necessary to apply a high voltage to the discharge electrode at the time of starting, so that the discharge lamp can be turned on in the state where the cold cathode is started. Figure 3A is a schematic view showing a gas discharge lamp in accordance with another embodiment of the present invention. Referring to FIG. 3, the two lead wires of the discharge electrode e at the end of the lamp tube are connected in a short circuit in the cap of the lamp tube end, and the built-in guide pole P is disposed along the inner wall of the lamp tube M, and the end ends thereof are close to the lamp. The positions of the tube discharge electrodes e are respectively provided with the auxiliary poles a1 and a2. The auxiliary pole is made, for example, of a tungsten wire, and preferably has a spiral shape. The spacing between the auxiliary pole and the discharge electrode is, for example, when the power supply voltage is 220 volts or 110 volts, the power supply frequency is 50 Hz or 60 Hz, and the inner diameter of the discharge lamp is about 17 and the length is about 1. 2 m. The best is 3 to 5mm. The body of the guiding pole is fixed, for example, by the ends of the ends of the tube. In contrast to the embodiment shown in Fig. 2, the end of the guiding pole, for example, also passes through the end of the lamp and an external impedance element is connected to the ballast circuit. The impedance elements shown in the figures are capacitors C1 and C2, but the impedance elements are not limited to capacitors, but inductors or resistors or a combination thereof may also be used. In the production, for example, the impedance element can be enclosed in the cap of the lamp tube or encapsulated in the tube tube. When considering the package in the tube tube, for example, the discharge gas can also be regarded as the impedance element. Thus, the lamp with the built-in guiding pole of the present invention can be directly mounted to the lamp socket using a conventional circuit configuration without any change in the circuit configuration.

The built-in guiding pole P shown in Fig. 3A has its both end portions taken out from both end portions of the bulb. As a variant, the built-in guiding pole P can also take only one of the ends out of one end of the tube, so that only one of the impedance elements C1 and C2 is required. As another variation, the auxiliary poles al or a2 provided on the leading poles may also be omitted (see Fig. 3B).

Figure 4 is a schematic view showing a gas discharge lamp in accordance with another embodiment of the present invention. Referring to Fig. 4, unlike the one shown in Fig. 3, two built-in guiding poles are disposed in the discharge lamp tube. A first auxiliary pole a1 adjacent to the first discharge electrode el is disposed on the first end of the first built-in guiding pole P1, and a first end portion of the second built-in guiding pole P2 is disposed adjacent to the second discharging electrode e2. Second auxiliary pole a2. The spacing between the auxiliary poles a1 and a2 and the discharge electrodes el and e2 is, for example, when the power supply voltage is 220 volts, the power supply frequency is 50 Hz or 60 Hz, the inner diameter of the discharge lamp is about 17 mm, and the length is about 1. 2 m, respectively, 2 to 10 Preferably, it is 3 to 5 let. The second end of the first built-in guiding pole P1 is connected to the ballast circuit via a first impedance element, and the second end of the second built-in guiding pole P2 is connected to the ballast circuit via a second impedance element. The impedance elements shown in the figures are capacitors C1 and C2, but the impedance elements are not limited to capacitors, but inductors or resistors or a combination thereof may also be used. The embodiment shown in Figure 4 allows for faster start-up of the lamp due to the use of two built-in guide poles. Figure 5 is a schematic view showing a gas discharge lamp in accordance with another embodiment of the present invention. Referring to FIG. 5, different from FIG. 4, the first auxiliary pole a1 disposed on the first end portion of the first built-in guiding pole P1 is disposed adjacent to the second discharge electrode e2, and the second built-in guiding pole P2 is disposed. The second auxiliary pole a2 provided at one end portion is disposed close to the first discharge electrode el. Thus, the two built-in guides do not need to be as long as in Figure 4.

The gas discharge lamp shown in Fig. 5 employs a U-shaped lamp tube, and it will be understood by those skilled in the art that the lamp of the present invention is not limited to a straight tube and a U-shaped tube, but is applicable to a tube of any shape.

Figure 6A is a schematic view showing a gas discharge lamp in accordance with another embodiment of the present invention. Wherein, an impedance element (for example, a capacitor) Ca is connected in parallel between the two discharge electrodes e at the end of the lamp tube, and the function thereof is to absorb the back EMF pulse or other interference signal when the discharge lamp is opened or closed or encounters external interference. The pulse current prevents the pulse current from damaging the discharge electrode, for example, preventing the sputtering current from damaging the discharge electrode. In Fig. 6A, the connecting line B between the impedance element Ca and the discharge electrode e is disposed outside the bulb.

Figure 6B is a schematic view showing a gas discharge lamp in accordance with another embodiment of the present invention. Different from Fig. 6A, a section of the connecting line B connecting the impedance element Ca to the discharge electrode e is disposed inside the bulb. As a variant, the connecting line B disposed inside the tube, for example, is wrapped with glass G to reduce the influence of the inside of the tube such as gas, impurities or temperature, discharge current, and the like.

It should be noted that FIGS. 6A and 6B are only two schematic views, and the concept of connecting the impedance element Ca in parallel between the two discharge electrodes e at the end of the lamp tube is also applicable to the above-mentioned FIG. 2, FIG. 3A, FIG. 4 and FIG. The scheme shown and its corresponding transformation. Moreover, for example, in the arrangement shown in Fig. 6B, the capacitor Ca may be disposed, for example, in the base of the lamp tube, for example, the base of the outer casing. Moreover, the connecting wire B does not extend to the outside of the lamp, for example, but can be directly connected to the end of the discharge electrode in the lamp cap.

The principle of the built-in guiding pole gas discharge lamp of the present invention can be applied to a discharge lamp such as a fluorescent lamp coated with a fluorescent powder in a tube, and can also be applied to a discharge of a fluorescent powder such as an ultraviolet lamp, an infrared lamp, or a high-pressure gas discharge in a tube. A discharge lamp such as a lamp or an arc lamp.

The above is a preferred embodiment of the present invention, and various changes and modifications can be made by those skilled in the art in light of the concept of the present invention, but such changes and modifications are within the scope of the present invention.

Claims

Rights request

A gas discharge lamp comprising:

a lamp tube, a discharge electrode disposed at both ends of the lamp tube, and a ballast connected between the discharge electrode and the power source, wherein the gas discharge lamp further includes a built-in guide electrode disposed near an inner wall of the lamp tube, An end of the built-in guiding pole is adjacent to the discharge electrode.

The gas discharge lamp according to claim 1, wherein the built-in guiding electrode includes an auxiliary electrode provided in the built-in guiding tip portion and opposed to the discharge electrode.

3. A gas discharge lamp as claimed in claim 1 or 2, characterized in that the end of the built-in guiding pole is connected to the ballast circuit via an impedance element.

4. The gas discharge lamp of claim 3, wherein the built-in guiding pole comprises a first built-in guiding pole and a second built-in guiding pole, the impedance element comprising a first impedance element and a second impedance element, a first end of the first built-in guiding pole is adjacent to a discharge electrode of the first end of the lamp tube, and a second end of the first built-in guiding pole is connected to a ballast circuit via a first impedance element; A first end of the second built-in guiding pole is adjacent to the discharge electrode of the second end of the lamp tube, and a second end of the second built-in guiding pole is connected to the ballast circuit via the second impedance element.

The gas discharge lamp according to claim 3, wherein the impedance element is at least one of a capacitor, an inductor, and a resistor.

The gas discharge lamp according to claim 1, wherein a distance between the end portion of the built-in guiding electrode and the discharge electrode is 2 to 10 mm.

The gas discharge lamp according to claim 2, wherein a distance between the auxiliary electrode having the built-in guiding electrode and the discharge electrode is 2 to 10 mm.

The gas discharge lamp according to claim 1 or 2, wherein the gas discharge lamp is a fluorescent lamp coated with a phosphor powder on an inner wall of the lamp tube.

The gas discharge lamp according to claim 1 or 2, wherein the gas discharge lamp is an ultraviolet lamp, an infrared lamp, a high-pressure gas discharge lamp or an arc lamp in which the inner wall of the lamp tube is not coated with phosphor.

10. The gas discharge lamp of claim 1 or 2, further comprising a lamp and a lamp A capacitor in parallel with the discharge electrodes at both ends of the tube.

11. A gas discharge lamp as claimed in claim 3, further comprising a capacitor arranged in parallel with the discharge electrode at both ends of the tube.

12. A gas discharge lamp as claimed in claim 4, further comprising a capacitor arranged in parallel with the discharge electrode at both ends of the tube.

13. The gas discharge lamp of claim 10, wherein at least a portion of the connecting line connecting the capacitor to the discharge electrode is disposed inside the bulb.

The gas discharge lamp according to claim 11 or 12, characterized in that at least a part of the connection line connecting the capacitors to the discharge electrodes is provided inside the bulb.

15. A gas discharge lamp as claimed in claim 13 or 14, characterized in that the connecting line arranged inside the tube encloses the glass.