JPH08102305A - Electroless discharge lamp, electrodelss discharge lamp lighting device and lighting system - Google Patents

Abstract

PURPOSE: To provide an electrodeless discharge lamp with easy start. CONSTITUTION: An electrodeless discharge lamp 5 is constituted by arranging four rolls of spiral high frequency exciting coils 21 withe high conductivity and circular cross section in the surroundings of a bulb 11. One end of the high frequency exciting coil 21 is connected to a high frequency oscillating circuit and the other end is connected to an earth. The center of the bulb 11 is slipped from the central axis of the high frequency exciting coil 21, displaced to one side of the high frequency exciting coil 21, and the distance L1 from the center of the bulb 11 to one end of the high frequency exciting coil 21 is shorter than the distance L2 to the other end. Since the bulb 11 is displaced to one side of the high frequency exciting coil 21, magnetic field is strengthened in a part where the bulb 11 and the high frequency exciting coil 21 are approached to increase the electric field. Thereby, discharge breakage is made easy to make starting easy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrodeless discharge lamp provided with a high frequency excitation coil around a bulb, an electrodeless discharge lamp lighting device, and a lighting device.

[0002]

2. Description of the Related Art In a general high pressure metal vapor discharge lamp, electrodes made of a high melting point metal are sealed at both ends of an arc tube in which a gas is filled, and arc discharge is generated between these electrodes to cause an arc discharge in the bulb. The encapsulated luminescent metal is ionized and excited to emit light.

However, a lamp having such electrodes requires electrode parts because the electrodes must be arranged in the bulb, and the sealing structure of these electrodes becomes complicated, and the bulb from the electrode sealing portion is required. A structure for preventing leakage of gas inside is also required, and the electrodes are eroded because they are exposed to the discharge space.

Therefore, in recent years, an electrodeless discharge lamp has received attention.

As this electrodeless discharge lamp, for example, the structure described in Japanese Patent Laid-Open No. 5-190156 is known. In the electrodeless discharge lamp described in Japanese Patent Laid-Open No. 5-190156, the center of this bulb and the central axis of the high-frequency excitation coil are made to coincide with each other around a translucent bulb in which a discharge substance is enclosed, with a gap provided therebetween. It is arranged to excite the high-frequency excitation coil to cause the bulb to emit light.

[0006]

However, in the electrodeless discharge lamp described in JP-A-5-190156, the center of the bulb is located on the central axis of the high frequency excitation coil, and the high frequency excitation coil and the bulb are Since the distance is almost the same in most parts, the magnetic field around the bulb is constant, and a large current must be passed to destroy the discharge when starting discharge, and it is not always easy to start. I have a problem.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an electrodeless discharge lamp, an electrodeless discharge lamp lighting device, and an illuminating device that facilitate starting.

[0008]

An electrodeless discharge lamp according to claim 1 is provided with a high-frequency excitation coil for generating a magnetic field, the high-frequency excitation coil being located in the high-frequency excitation coil, and the center of the high-frequency excitation coil being closer to the high-frequency coil. And a translucent bulb in which the discharge substance is enclosed and which is eccentrically arranged.

An electrodeless discharge lamp according to a second aspect is the electrodeless discharge lamp according to the first aspect, wherein the bulb is in contact with the inner circumference of the high frequency excitation coil.

An electrodeless discharge lamp according to a third aspect of the present invention is the electrodeless discharge lamp according to the first or second aspect, wherein the bulb has a starting auxiliary conductor provided in the bulb and to which a high voltage is applied at the time of starting. is there.

An electrodeless discharge lamp according to a fourth aspect is the electrodeless discharge lamp according to the first to third aspects, in which the bulb is made of ceramics.

An electrodeless discharge lamp according to a fifth aspect of the present invention is the electrodeless discharge lamp according to any of the first to fourth aspects, wherein the high frequency excitation coil is formed of four or more turns.

An electrodeless discharge lamp lighting device according to a sixth aspect comprises the electrodeless discharge lamp according to any one of the first to fifth aspects, and a lighting circuit connected to a high frequency excitation coil of the electrodeless discharge lamp. It is a thing.

An electrodeless discharge lamp lighting device according to a seventh aspect of the present invention is an electrodeless discharge lamp according to any one of the third to fifth aspects, and a starting circuit connected to a starting aid of a bulb of the electrodeless discharge lamp. And a main lighting circuit connected to the high frequency excitation coil of the electrodeless discharge lamp.

An electrodeless discharge lamp lighting device according to claim 8 is connected to the electrodeless discharge lamp according to any one of claims 3 to 5 and a starting auxiliary member for the bulb of the electrodeless discharge lamp, and a high voltage is applied at the time of starting. A starting circuit for applying the voltage and a main lighting circuit connected to the high-frequency excitation coil of the electrodeless discharge lamp for applying a voltage lower than the high voltage at the time of starting after starting.

An illumination device according to a ninth aspect comprises the electrodeless discharge lamp according to any one of the first to fifth aspects, and an illumination device main body provided with the electrodeless discharge lamp.

A lighting device according to a tenth aspect of the present invention includes an electrodeless discharge lamp according to the fifth aspect, a lighting circuit for lighting the electrodeless discharge lamp, and a lighting device main body provided with the electrodeless discharge lamp and the lighting circuit. It is equipped with.

[0018]

In the electrodeless discharge lamp according to the present invention, the center of the translucent bulb is deviated from the center of the high frequency excitation coil, so that there is a portion where the distance between the high frequency excitation coil and the bulb is short. At a portion where this distance is short, the magnetic field becomes strong, and the electric field concentrates and discharges easily, so starting is facilitated.

The electrodeless discharge lamp according to a second aspect of the present invention is the electrodeless discharge lamp according to the first aspect, wherein the bulb is in contact with the inner circumference of the high frequency excitation coil, so that the distance between the high frequency excitation coil and the bulb is short. Therefore, in this portion, the magnetic field becomes strong, and the electric field concentrates and easily discharges, so that the starting becomes easy.

An electrodeless discharge lamp according to a third aspect is the electrodeless discharge lamp according to the first or second aspect, in which the bulb has a starting auxiliary conductor to which a high voltage is applied at the time of starting, so that it is easier to discharge. It will be easier to start.

The electrodeless discharge lamp according to claim 4 is the electrodeless discharge lamp according to any one of claims 1 to 3, wherein the bulb is made of ceramics, so that the magnetic permeability is high, the magnetic field is strong, and the electric field is concentrated, which is easy. Since it discharges to the left, it becomes easier to start.

An electrodeless discharge lamp according to a fifth aspect is the electrodeless discharge lamp according to any one of the first to fourth aspects, in which the high frequency excitation coil is formed by a coil having four or more turns, the magnetic field becomes strong and the electric field becomes strong. Since it is concentrated and easily discharged, starting becomes easy.

An electrodeless discharge lamp lighting device according to a sixth aspect comprises the electrodeless discharge lamp according to any one of the first to fifth aspects and a lighting circuit connected to a high frequency excitation coil of the electrodeless discharge lamp. , Easier to start.

An electrodeless discharge lamp lighting device according to a seventh aspect of the invention is such that the starting circuit is connected to the auxiliary starting body of the bulb of the electrodeless discharge lamp according to any of the third to fifth aspects, and the main lighting circuit is connected to the high frequency excitation coil. Since it is connected, starting is easy.

The electrodeless discharge lamp lighting device according to claim 8 is connected to the starting auxiliary member of the bulb of the electrodeless discharge lamp according to any one of claims 3 to 5, and a high voltage is applied in the starting circuit at the time of starting, so that a high frequency Since a voltage lower than the high voltage at the time of starting is applied to the excitation coil by the main lighting circuit after starting, starting becomes easy.

Since the illuminating device according to the ninth aspect comprises the illuminating device main body provided with the electrodeless discharge lamp according to any one of the first to fifth aspects, it can be easily started.

Since the illuminating device according to the tenth aspect comprises the electrodeless discharge lamp according to the fifth aspect and the illuminating device main body provided with the lighting circuit, the starting is facilitated.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the illumination device of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, a lighting device 1 is attached to a pole (not shown) that illuminates a road such as a highway. In this lighting device 1, a lower surface opening of a lighting device main body 2 is closed by a prism cover 3, and a reflecting mirror 4 is installed in the lighting device main body 2. An electrodeless discharge lamp 5 is arranged so as to face the reflecting mirror 4, and the light emitted from the electrodeless discharge lamp 5 is
It is reflected by the reflecting mirror 4 and the irradiation direction is controlled by the prism cover 3 to irradiate the road.

Further, a high-frequency oscillation circuit as a main lighting circuit for maintaining the lighting of the electrodeless discharge lamp 5 is provided in the lighting device main body 2 by wiring to the printed circuit board 6, and is also used for starting. A starting circuit component 7 is housed.

As shown in FIG. 1, the electrodeless discharge lamp 5 is made of a high melting point glass such as synthetic quartz or a transparent ceramic material such as alumina and has an outer diameter of about 29.
It has a spherical bulb 11 of mm, and the bulb 11 is filled with a luminescent substance that emits light by arc discharge induced by plasma, for example, a metal halide, NaI-CeI ₃ . In addition to these luminescent substances, the bulb 11 is filled with at least one starting rare gas such as argon, xenon, krypton or neon.

A starting thin tube 12 is connected to one end of the valve 11 on the center line. This starting thin tube
12 is made of the same material as the valve, and is isolated from the inside of the valve 11 via a partition wall 13. At least one kind of argon or krypton is enclosed in the starting thin tube 12 as a starting rare gas.

Further, a starting electrode 14 as a starting auxiliary conductor shown in FIG. 3 is coaxially fitted and attached to the starting thin tube 12, and the starting electrode 14 includes capacitors 15 and 16 and an impedance 17, which are high in height. It is connected to a starting circuit 18 for voltage generation, and this starting circuit 18 is connected to a high frequency oscillation circuit of the printed circuit board 6.

Further, around the valve 11, an inner diameter of about 34 m
m is a high-purity aluminum, silver, copper, etc. conductive high-frequency excitation coil 21 of four turns having a circular or elliptical cross-section with excellent conductivity.
21 has one end connected to the high-frequency oscillation circuit and the other end connected to a ground (not shown). In addition,
The center of the valve 11 is deviated from the central axis of the high-frequency excitation coil 21, and is arranged offset to one side of the high-frequency excitation coil 21, and the distance L1 between the center of the valve 11 and one end of the high-frequency excitation coil 21 is the other. It is shorter than the distance L2 to the edge.

For the light emission of the electrodeless discharge lamp 5, a high voltage is applied to the starting electrode 14 by the starting circuit 18, and a voltage lower than the voltage of the starting circuit 18 supplied from the high frequency oscillation circuit is about 13.56 MHz. A high-frequency current is applied to the high-frequency excitation coil 21, and the high-frequency current causes a high-frequency magnetic field to be generated in the high-frequency excitation coil 21 along the axial direction. The high-frequency magnetic field causes the high-frequency magnetic field to be housed in the central space of the high-frequency excitation coil 21. In the bulb 11, a donut-shaped arc discharge due to plasma is generated so as to surround the shaft.
The arc discharge causes the luminescent metal to be ionized and excited to emit light, which passes through the bulb 11 and is emitted to the outside.

In the electrodeless discharge lamp 5, since the bulb 11 is arranged so as to be offset to one side of the high frequency excitation coil 21, a magnetic field is generated in the portion where the bulb 11 and the high frequency excitation coil 21 are close to each other. Since it becomes stronger and the electric field becomes higher, it is more likely to be destroyed by discharge, and can be easily started.

As another embodiment, for example, as shown in FIG. 4, the valve 11 is housed in an outer tube 31 whose interior is made of quartz, and the outer tube 31 is placed in a high frequency excitation coil 21. It may be located.

As described above, even if the valve 11 is housed in the outer tube 31 and positioned on the high-frequency excitation coil 21, the operation is the same as in the case without the outer tube 31.

Further, as another embodiment, for example, FIG.
As shown in, the outer circumference of the valve 11 may be brought into contact with the inner circumference of the high frequency excitation coil 21.

As described above, by bringing the outer periphery of the valve 11 into contact with the high-frequency excitation coil 21, the magnetic field becomes strong near the portion where the high-frequency excitation coil 21 contacts the valve 11,
Since the electric field is concentrated, starting is easy.

According to the experiment, when the valve 11 is located at the center of the high frequency excitation coil 21, the starting voltage 16
The starting voltage is 80 V and the starting current is 60 A, whereas the starting voltage is 80 V when the valve 11 is brought into contact with the high frequency excitation coil 21.
The starting voltage and the starting current are reduced to about 1/2 by displacing the valve 11, and the stable voltage is 533V and the stable current is 20A.

As another embodiment, for example, as shown in FIG. 6, the valve 11 is housed in an outer tube 31 whose interior is made of quartz, and the valve 11 is brought into contact with the outer tube 31. The valve 11 may be brought into contact with the high frequency excitation coil 21.

As described above, by bringing the outer periphery of the valve 11 into contact with the inner periphery of the outer pipe 31 and the outer periphery of the outer pipe 31 into contact with the inner periphery of the high frequency excitation coil 21,
The magnetic field becomes strong and the electric field concentrates in the vicinity of the portion where the high frequency excitation coil 21 comes into contact via 31 and therefore the starting is facilitated.

Further, as shown in FIG. 7, a spherical valve
If a cylindrical valve 32 is used instead of 11, and the cylindrical axis OB of this valve 32 and the central axis OL of the high-frequency excitation coil 21 are displaced in parallel or inclined, the spherical valve 11 is also used in this case. The same effect can be obtained, and the same applies when the valve 32 is housed in the outer pipe 31, as shown in FIG. Further, by using the cylindrical valve 32, the ratio of the lines of electric force passing through the valve 32 is improved, the glow is easily generated, and the starting characteristic can be improved.

Further, as shown in FIG. 9, the valve 11 may be supported and accommodated in the outer tube 31 by a support 33 such as glass or ceramics provided radially from the center of the valve 11. In this way, by supporting the outer tube 31 with the support body 33, the support body 33 has a magnetic permeability of 5 compared to the vacuum inside the outer tube 31.
Since it is about 10 times higher, the same effect as when the distance is shortened can be obtained, the passing rate of the lines of electric force in this portion is improved, and the glow is easily generated, so that the starting characteristics can be improved. Further, since the support 33 is formed radially from the bulb 11, it is unlikely to be shaded when the bulb 11 emits light.

Further, in any case, the outer tube 31 may be filled with a low-pressure discharge gas of about 100 Torr or less, such as argon, neon-argon, krypton, or xenon. In this way, by enclosing the low-pressure discharge gas, glow occurs in the outer tube 31, so that the same effect as when the distance is shortened is obtained, and the starting characteristic is improved.

Further, the high frequency excitation coil 21 is such that the conductor corresponding to the coil wire is composed of a ring-shaped metal disc having a high conductivity such as high-purity aluminum and forms a spiral energization path as a whole. May be

In any of the embodiments, the same effect can be obtained even if the starting electrode 14 is not provided and only the high-frequency exciting coil 21 is used for starting.

Further, since the valve 11 or the valve 32 is made of ceramics, the magnetic permeability becomes twice as high as that of the conventional quartz, so that the starting voltage and the starting current can be reduced.
It can be started easily.

[0050]

According to the electrodeless discharge lamp of the first aspect, the center of the translucent bulb is deviated from the center of the high frequency excitation coil, so that the distance between the high frequency excitation coil and the bulb is short. Since a portion is generated, the magnetic field becomes strong in the portion where the distance is short, and the electric field is concentrated and easily discharged, so that the starting can be facilitated.

According to the electrodeless discharge lamp of the second aspect, in addition to the electrodeless discharge lamp of the first aspect, since the bulb is in contact with the inner circumference of the high frequency excitation coil, the high frequency excitation coil and the bulb are connected. Since the distance is short, the magnetic field becomes strong in this portion, and the electric field is concentrated and easily discharged, so that starting can be facilitated.

According to the electrodeless discharge lamp of claim 3, in addition to the electrodeless discharge lamp of claim 1 or 2,
Since the valve has a starting auxiliary conductor to which a high voltage is applied at the time of starting, it is easier to discharge and thus easier to start.

According to the electrodeless discharge lamp of claim 4, in addition to the electrodeless discharge lamp of claims 1 to 3,
Since the bulb is made of ceramics, it has a high magnetic permeability and a strong magnetic field, and the electric field concentrates and discharges easily, so starting can be facilitated.

According to the electrodeless discharge lamp of the fifth aspect, in addition to the electrodeless discharge lamp according to any one of the first to fourth aspects, since the high frequency excitation coil is formed by a coil having four or more turns, the magnetic field becomes strong. Since the electric field is concentrated and easily discharged, the starting can be facilitated.

According to the electrodeless discharge lamp lighting device of the sixth aspect, the electrodeless discharge lamp according to any one of the first to fifth aspects and the lighting circuit connected to the high frequency excitation coil of the electrodeless discharge lamp. Since it is equipped, it can be started easily.

According to the electrodeless discharge lamp lighting device of the seventh aspect, the starting circuit is connected to the starting auxiliary member of the bulb of the electrodeless discharge lamp according to any of the third to fifth aspects, and the high-frequency excitation coil is mainly turned on. Since the circuit is connected, starting can be facilitated.

According to the electrodeless discharge lamp lighting device of the eighth aspect, a high voltage is applied in the starting circuit at the time of starting, which is connected to the starting aid of the bulb of the electrodeless discharge lamp according to any of the third to fifth aspects. , Since a voltage lower than the high voltage at the time of starting is applied to the high-frequency excitation coil in the main lighting circuit after starting,
It can be started easily.

According to the illumination device of the ninth aspect, since the illumination device main body provided with the electrodeless discharge lamp according to any one of the first to fifth aspects is provided, the starting can be facilitated.

According to the lighting device of the tenth aspect, since it comprises the electrodeless discharge lamp of the fifth aspect and the lighting device main body provided with the lighting circuit, the starting can be facilitated.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an electrodeless discharge lamp of the present invention.

FIG. 2 is a cross-sectional view showing the same lighting device.

FIG. 3 is a circuit diagram showing a starting circuit of the same.

FIG. 4 is a sectional view showing a high frequency excitation coil of another embodiment of the same.

FIG. 5 is a sectional view showing a high frequency excitation coil according to another embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a high frequency excitation coil of still another embodiment of the same.

FIG. 7 is a sectional view showing a high frequency excitation coil according to still another embodiment of the present invention.

FIG. 8 is a cross-sectional view showing a high frequency excitation coil of the above and yet another embodiment.

FIG. 9 is a cross-sectional view showing a high frequency excitation coil of another embodiment of the above.

[Explanation of symbols]

 1 Lighting device 2 Lighting device main body 11 Bulb 14 Starting electrode as a starting auxiliary conductor 18 Starting circuit 21 High frequency excitation coil

Claims (10)

[Claims] 1. A high-frequency excitation coil for generating a magnetic field, and a translucent member located in the high-frequency excitation coil, the center of which is deviated from the center of the high-frequency excitation coil toward the high-frequency coil side, in which a discharge substance is enclosed. An electrodeless discharge lamp, which is characterized by comprising a bulb having a characteristic. 2. The electrodeless discharge lamp according to claim 1, wherein the bulb is in contact with the inner circumference of the high frequency excitation coil. 3. The electrodeless discharge lamp according to claim 1, wherein the bulb has a starting auxiliary conductor which is provided in the bulb and to which a high voltage is applied at the time of starting. 4. The electrodeless discharge lamp according to claim 1, wherein the bulb is made of ceramics. 5. The electrodeless discharge lamp according to claim 1, wherein the high frequency excitation coil is formed by a coil having four or more turns. 6. An electrodeless discharge lamp lighting device, comprising: the electrodeless discharge lamp according to claim 1; and a lighting circuit connected to a high-frequency excitation coil of the electrodeless discharge lamp. . 7. The electrodeless discharge lamp according to claim 3, a starting circuit connected to a starting aid of a bulb of the electrodeless discharge lamp, and a high frequency excitation coil of the electrodeless discharge lamp. An electrodeless discharge lamp lighting device, comprising: 8. The electrodeless discharge lamp according to any one of claims 3 to 5, a starting circuit connected to a starting aid of a bulb of the electrodeless discharge lamp to apply a high voltage at the starting, and the electrodeless discharge lamp. And a main lighting circuit that is connected to the high frequency excitation coil and applies a voltage lower than the high voltage at the time of starting after starting. 9. An illumination device comprising the electrodeless discharge lamp according to claim 1 and an illumination device main body provided with the electrodeless discharge lamp. 10. The electrodeless discharge lamp according to claim 5, a lighting circuit for lighting the electrodeless discharge lamp, and a lighting device main body provided with the electrodeless discharge lamp and the lighting circuit. Lighting equipment.