JPH1116541A - Electrodeless discharge lamp and discharge lamp-lighting device and liquid treatment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently lengthen a life of a lamp retainer material as well as to efficiently light an electrodeless discharge lamp held and closed within a protector tube, etc. SOLUTION: An electrodeless discharge lamp is vertically held and closed within a protector tube 4. When an induction coil 2 is supplied with a high-frequency current from a source 10 through leads 7, a light emitting tube 1 is lighted, ultraviolet rays are emitted, which penetrate the protector tube 4 and are irradiated to the surrounding water, then pasteurize the water. A mercury- pool 3 in which mercury 20 is held protrudes from the light emitting tube 1. For example, when a load of the tube wall of the lamp is 0.38 W/cm<2> the temperature of the mercury 20 can be controlled at 40 deg.C and the electrodeless discharge lamp can be efficiently lighted if the projecting length L of the mercury-pool 3 is set for 40 mm. Also because gaseous nitrogen 30 is filled within the protector tube 4, ozone does not generate, for that, a lamp retainer material does not deteriorate and its life can be lengthened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to water,
The present invention relates to an electrodeless discharge lamp for performing a treatment such as sterilization on fluids such as sewage and air, a liquid treatment device and a discharge lamp lighting device using the electrodeless discharge lamp, and a discharge lamp lighting device for lighting an electroded discharge lamp. .

[0002]

2. Description of the Related Art Conventionally, a liquid processing apparatus (ultraviolet irradiation apparatus) for arranging an arc tube such as a low-pressure discharge lamp that emits ultraviolet light in a fluid to be treated such as water, air, or sewage to perform sterilization or the like. Is being developed. As the arc tube,
For example, an electrodeless discharge lamp (electrodeless ultraviolet low-pressure discharge lamp) having an external induction coil and a low-pressure (mercury) discharge lamp with electrodes as shown in JP-A-64-2248 and JP-A-2-37660 are used. ing. Electrodeless discharge lamps use quartz glass for the bulb material and supply electric power through electromagnetic coupling by an induction coil located outside the bulb without electrodes inside the bulb to excite the enclosed mercury and emit light. Let me. Such a system is described in Japanese Patent Application Laid-Open No. 64-2248.

In such a low-pressure discharge lamp, the mercury vapor pressure during operation must be regulated to about 0.8 Pa, and the mercury vapor pressure at that time is about 40.degree. However, when the low-pressure discharge lamp is held in a protective tube made of quartz or the like and lit with a tube wall load of 0.1 W / cm ² or more, as in the case of using the above-described liquid processing apparatus, the coldest part of the arc tube Has a temperature of 40 ° C. or higher, and the mercury vapor pressure cannot be optimally controlled, resulting in a problem that the luminous efficiency is significantly reduced.

[0004] In order to avoid this, some conventional liquid processing apparatuses include a U which is lit at a current density of 1 A / cm ² or more.
A low-pressure discharge lamp having a V-shape, a power supply device for lighting the low-pressure discharge lamp with a rectangular wave current, and a cooling device for cooling the mercury temperature in the lamp to 40 ° C. when the discharge lamp is used in an airtight container. For example, Japanese Patent Laid-Open No. 4-3
There is one described in JP-A-01354.

[0005] In the above cooling device, a metal cooling block in which a radiation fin is connected by a heat pipe is brought into contact with an end of a bulb constituting an arc tube of a U-shaped low-pressure discharge lamp, and the radiation fin is connected to the end. The coolest part is formed at the end of the arc tube bulb by air cooling with a fan or the like. However, since the cooling device has a configuration in which a metal cooling block and a glass U-shaped arc tube are in linear contact with each other, the arc tube is made of metal due to variations in the shape of the U-shaped low-pressure discharge lamp. In some cases, a portion that does not come into contact with the cooling block is produced, so that the U-shaped low-pressure discharge lamp cannot be sufficiently cooled, and the characteristics of the lamp cannot be sufficiently brought out.

When a conventional electrodeed low-pressure discharge lamp is used in a liquid processing apparatus, it is usually mounted on a glass protective tube, and the protective tube is used in contact with treated water. In the electrodeed low-pressure discharge lamp, since there is no particular restriction on the holding material of the lamp, the lamp is usually held in a protective tube by a lamp holder made of a stainless dielectric or the like.
Therefore, there was no problem even if the atmosphere in the protective tube was air. However, since the above-mentioned electrodeless discharge lamp supplies electric power to the lamp by electromagnetic field coupling, a dielectric cannot be used around the lamp. Therefore, Teflon or peak material is used as a lamp holding material. These Teflon and peak materials are excellent in ultraviolet resistance, ozone resistance, and the like. However, in particular, ozone generated in the air in the protective tube can provide only a life of about one year, and the life is short.

[0007]

As described above, when the conventional low-pressure discharge lamp is used in a protective tube when the lamp is lit at a tube wall load of 0.1 W / cm ² or more, the coldest part of the arc tube is used. When the temperature exceeds 40 ° C., the vapor pressure of mercury cannot be optimally controlled, and there has been a problem that the luminous efficiency is significantly reduced. Therefore, some low-pressure discharge lamps having electrodes have a cooling device that keeps the mercury temperature at about 40 ° C. by cooling the arc tube by contacting it with a metal cooling block. Due to variations in the shape and support of the lamp, there is a portion where the arc tube cannot contact the metal cooling block, and the U-shaped low-pressure discharge lamp cannot be cooled sufficiently, and the characteristics of the lamp cannot be sufficiently brought out. there were. In addition, Teflon and peak materials are used as a lamp holding material for the electrodeless discharge lamp housed in a sealed protective tube, but there is a problem that the life is short due to deterioration due to ozone generated in the protective tube. Was.

Accordingly, the present invention has been made to solve the above-mentioned problems, and has a good lighting efficiency when lighted in a sealed state in a protective tube, and sufficiently extends the life of a lamp holding material. Electrodeless discharge lamp, which can
A liquid processing device having good maintenance properties using the electrodeless discharge lamp, a discharge lamp lighting device using the electrodeless discharge lamp with improved durability, and a discharge lamp lighting device capable of reliably cooling the lamp. It is intended to provide.

[0009]

According to a first aspect of the present invention, there is provided an arc tube made of a translucent material in which a discharge medium containing mercury is sealed, an induction coil wound around the outer periphery of the arc tube, and the light emitting tube. A mercury reservoir that projects from the arc tube so as to be connected to the internal space of the tube and stores the mercury;

[0010] With this configuration, the mercury in the arc tube is held in the mercury reservoir, and the vapor of the mercury fills the arc tube. When the mercury reservoir is turned on in a sealed protective tube accommodating such an arc tube and an induction coil, the mercury reservoir has a high cooling rate because it protrudes outside from the arc tube.
Thereby, the temperature of the mercury inside can be 40 ° C. if the length of the protrusion of the mercury reservoir and the distance from the inner wall of the protection tube are appropriately adjusted.
By controlling the temperature within a predetermined range before and after, the mercury vapor pressure in the arc tube becomes about 0.8 Pa and the lamp is lit with good efficiency.

According to a second aspect of the present invention, when the arc tube and the induction coil are housed in a sealed protective tube and the arc tube is turned on, the mercury reservoir is separated from the inner wall of the protective tube by 10 mm or more. When the protruding length of the mercury reservoir is L (mm) and the tube wall load of the arc tube is PW / cm ² , 0.1 ≦ P <
When 0.3, 10 ≦ L ≦ 30, or 0.3 ≦ P ≦
When 0.5, 30 ≦ L ≦ 50.

With this configuration, the mercury in the mercury reservoir can be increased from 30 ° C. to 50 ° C. by increasing the length L of the mercury reservoir protruding from the arc tube as the tube wall load of the arc tube increases.
, The arc tube is lit with good efficiency.

According to a third aspect of the present invention, there is provided an arc tube made of a translucent material in which a discharge medium containing mercury is sealed, an induction coil wound around the outer periphery of the arc tube, and the arc tube and the induction coil sealed. At least a part of which is housed is provided with a protective tube made of a translucent material and filled with an inert gas, and a high-frequency power supply for supplying a high-frequency current to the induction coil.

With such a configuration, when a high-frequency current is supplied to the induction coil from the high-frequency power supply, the arc tube is turned on, and ultraviolet rays are emitted. The ultraviolet rays are emitted to the outside of the protection tube, but ozone is not generated because the inside of the protection tube is filled with an inert gas such as argon.
Therefore, although the mount member such as the holding member for holding the induction coil is irradiated with ultraviolet rays, it is not exposed to ozone, and deterioration due to ozone can be prevented. For this reason, even if Teflon or a peak material is used as the mounting member, the life of these members becomes one year or more.

According to a fourth aspect of the present invention, a mercury reservoir for storing the mercury is protruded from the arc tube so as to be connected to the internal space of the arc tube.

With this configuration, the temperature of the mercury inside can be controlled to a temperature in a predetermined range of about 40 ° C. by appropriately adjusting the protruding length of the mercury reservoir and the distance from the inner wall of the protective tube. The tubes are lit with good efficiency.

According to a fifth aspect of the present invention, there is provided an electrodeless discharge lamp as defined in the first aspect, a protective tube which at least partially accommodates the electrodeless discharge lamp in a sealed manner and which is made of a translucent material; The apparatus includes a high-frequency power supply for supplying a high-frequency current to an induction coil of a lamp, and a treatment tank containing the protective tube, into which water to be treated flows in, and from which treated water flows out.

With this configuration, when a high-frequency current is supplied from the high-frequency power supply to the induction coil of the electrodeless discharge lamp, the electrodeless discharge lamp is turned on, and ultraviolet light passes through the protective tube and passes through the protection tube. Radiated into water. The water to be treated flows into the treatment tank, and the inflow water is sterilized by the ultraviolet light, becomes treated water, and flows out of the treatment tank. At this time, a mercury reservoir protrudes from the arc tube of the electrodeless discharge lamp, and the temperature of mercury in the mercury reservoir is controlled to a predetermined range. As a result, the electrodeless discharge lamp is turned on with good efficiency and emits ultraviolet light efficiently, so that the water to be treated is efficiently sterilized.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing one embodiment of the electrodeless discharge lamp of the present invention. 1 is an arc tube made of quartz glass which emits ultraviolet rays, 2 is an induction coil wound around the outer periphery of the arc tube 1, 3 is a mercury reservoir protruding from the arc tube 1, 4 is a protection tube made of quartz, 5 is a vessel for closing the opening of the protection tube 4, 6 is a rubber packing for sealing between the protection tube 4 and the vessel 5, 10 is a power supply for supplying high-frequency power to the induction coil 2, and 20 is inside the mercury reservoir 3. The stored mercury 30 is a nitrogen gas filled in the protection tube 4.

FIG. 2 is a sectional view showing a detailed configuration example of the arc tube 1 shown in FIG. The arc tube 1 has an outer tube 111 having an opening at the center, and a middle tube 1 penetrating the opening of the outer tube 111.
12. Aluminum oxide (Al ₂ O ₃ ) is applied to the inner wall surface of a space portion having a donut-shaped cross section formed by the inner wall surface of the outer tube 111 and the outer wall surface of the middle tube 112. In the arc tube 1 of this example, both ends of a quartz bulb having an outer diameter of 60 mm, an inner diameter of 40 mm, and a total length of 600 mm are hermetically sealed, and its space is filled with 10 mg of mercury and 133 Pa of argon gas.

FIG. 3 is an enlarged sectional view of the mercury reservoir 3 shown in FIG. The mercury reservoir 3 is formed integrally with the outer tube 111 so as to protrude from the outer tube 111 of the arc tube 1, and stores mercury 20.

Next, the operation of this embodiment will be described. When a high-frequency current of 13.56 MHz is supplied from the power supply device 10 to the induction coil 2 through the lead wire 7, electromagnetic energy is supplied into the arc tube 1, and the arc tube 1 is turned on. Radiated to the outside.
The ultraviolet rays are radiated into the external water through the protective tube 4. The protective tube 4 is hermetically sealed by a vessel 5 and a packing 6, and has a nitrogen gas 30 at atmospheric pressure when it is hermetically sealed. Therefore, when the arc tube 1 is turned on as described above without the flow of air, the temperature increases. However, since the mercury reservoir 3 protrudes below the arc tube 1, the portion of the mercury reservoir 3 is cooled, and the temperature is lower than that of the main body of the arc tube 1.

Therefore, the temperature of the mercury 20 is controlled by the protrusion length L of the mercury reservoir 3. When the mercury 20 is at least 10 mm away from the inner wall surface of the protection tube 4 and the mercury reservoir 3
Assuming that the protrusion length L is appropriate, the relationship between the tube wall load P (W / cm ² ), the protrusion length L (mm) and the mercury temperature 20 of the arc tube 1 is as shown in FIG. From FIG. 4, the lamp of the above specification has a tube wall load of 0.38 W / cm ^2. Therefore, if the protrusion length L is set to 40 mm, the temperature of the mercury 20 is controlled to 40 ° C., and the mercury vapor pressure during lighting is reduced to about It is set to about 0.8 Pa. The relationship between the temperature of the mercury 20 and the luminous efficiency of the arc tube 1 is as shown in FIG.
It can be seen that the luminous efficiency is highest.

Here, in a structure in which mercury is held in the mercury reservoir 3 protruding from the arc tube 1 and is separated from the inner wall of the protective tube 4 by 10 mm or more, the projecting length of the mercury reservoir 3 is set to L (m
m), when the pipe wall load is P (W / cm ² ), 0.1 ≦ P <0.3, 10 ≦ L ≦ 30, 0.3 ≦ P ≦ 0.5, 30 ≦ L If ≦ 50, the temperature of the mercury 20 in the mercury reservoir 3 is 30 as shown in FIG.
It can be seen that the luminous efficiency of the arc tube 1 can be maintained at a high temperature in the range of 50 ° C to 50 ° C.

According to the present embodiment, a mercury reservoir 3 having a protruding length L (mm) is provided on the arc tube 1 of the electrodeless discharge lamp housed in the protective tube 4 and turned on. When the tube wall load of the arc tube 1 is P (W / cm ² ), 0.1
When ≦ P <0.3, 10 ≦ L ≦ 30 or 0.3 ≦ P ≦
At 0.5, by setting 30 ≦ L ≦ 50, the temperature of the mercury 20 in the mercury reservoir 3 can be in the range of 30 ° C. to 50 ° C., so that even if the temperature of the arc tube 1 rises, 3 can be kept low, and the arc tube 1 can be turned on with high luminous efficiency.

Incidentally, the mercury reservoir 3 can be used as an exhaust pipe when air in the photoelectric tube 1 is evacuated.

FIG. 6 shows a first embodiment of a discharge lamp lighting device according to the present invention.
FIG. 2 is a side view showing the embodiment. 1 is an arc tube made of quartz glass which emits ultraviolet light, 2 is an induction coil wound around the outer periphery of the arc tube 1, 3 is a mercury reservoir protruding from the arc tube,
4 is a quartz protective tube, 5 is a vessel for closing the opening of the protective tube, 7 is a lead wire for introducing high-frequency current to the induction coil 2, 9 is an O-ring for sealing between the protective tube 4 and the vessel 5,
Reference numeral 10 denotes a power supply for supplying a high-frequency current to the induction coil 2 through the lead wire 7, reference numeral 20 denotes mercury stored in the mercury reservoir 3, reference numeral 50 denotes argon gas filled in the protective tube 4, and reference numeral 51 denotes an arc tube 1. A pair of holders 52 made of Teflon or peak material, which are inserted at both ends of the arc tube, are supported by these holders 51 and provided with a coil made of Teflon or peak material provided along the outer peripheral longitudinal direction of the arc tube 1. The pressing is mechanically holding the induction coil 2.

Next, the operation of this embodiment will be described. When a high-frequency current is supplied from a high-frequency power supply (not shown) to the induction coil 2 through the lead wire 7, the arc tube 1 is turned on. As a result, ultraviolet rays are emitted from the arc tube 1, but the inside of the protective tube 4 is filled with argon 50, which is an inert gas. Therefore, no ozone is generated in the protection tube 4.
In addition, the mercury reservoir 3 of the arc tube 1 of this example is also separated from the protective tube 4 by an appropriate distance, and the protruding length L is also an appropriate value, so that the temperature of mercury in the arc tube 1 is about 40 ° C. And is lit with good efficiency.

According to the present embodiment, since the protective tube 4 is filled with the argon gas 50, no ozone is generated in the protective tube 4, so that the holder 51 and the coil holder 52 made of Teflon or peak material are used. Is not degraded by ozone and can extend the life of these components to more than one year.
Thereby, the durability of the device can be improved.

FIG. 7 shows a second embodiment of the discharge lamp lighting device according to the present invention.
FIG. 2 is a side view showing the embodiment. In this example, the electrodeless discharge lamp is installed horizontally in the horizontal direction. The configuration is the same as that of the second embodiment shown in FIG. 6 except that the mercury reservoir 3 is not provided, except for the difference between the vertical installation and the horizontal installation.

Also in this embodiment, since the protective tube 4 is filled with argon gas, no ozone is generated in the protective tube 4 and the holder 51 and the coil presser 52 made of Teflon or peak material are made of ozone. The life of these members, which is caused by deterioration, can be extended to one year or more, thereby improving the durability of the device.

FIG. 8 is a side view showing an embodiment of the liquid processing apparatus of the present invention. Numeral 4 denotes a quartz protective tube housing the electrodeless discharge lamp shown in FIG. 1 in a watertight manner, numeral 40 denotes a sterilization tank, and sewage such as sewage flows from a water channel 401.
The structure is such that it flows out from the drain 402. 41
Reference numeral denotes a support member for supporting and fixing the plurality of protection tubes 4 in the vertical direction, and reference numeral 42 denotes a high-frequency power supply that supplies a high-frequency current to the electrodeless discharge lamp in the protection tube 4 through the lead wire 43.

Next, the operation of this embodiment will be described. When a high-frequency current is supplied from the high-frequency power supply 42 to the electrodeless discharge lamp in each protection tube 4 through the lead wire 43,
These electrodeless discharge lamps are turned on, and ultraviolet rays are emitted into the sewage through each protective tube 4. Thereby, the waterway 401
The sewage flowing from the water is sterilized by the ultraviolet light in the sterilization tank 40, and the sterilized water flows out from the drainage channel 402 to the outside.

According to the present embodiment, the electrodeless discharge lamp in the protective tube 4 has a mercury reservoir protruding from its arc tube portion, and the mercury reservoir is placed at an appropriate distance from the inner wall in the protective tube 4. Since it is arranged at a distance and the protruding length of the mercury reservoir is appropriate, the mercury in the mercury reservoir can be maintained at about 40 ° C. Thus, the electrodeless discharge lamp can emit light with good efficiency, and wastewater treatment can be performed efficiently. In addition, since the protective tube 4 is filled with an inert gas such as a nitrogen gas or an argon gas,
Ozone is not generated in the protective tube 4, and the life of members such as a holder and a coil holder attached to the electrodeless discharge lamp can be extended to one year or more, thereby reducing the number of replacements of the electrodeless discharge lamp. And maintainability can be improved.

FIG. 9 shows a third embodiment of the discharge lamp lighting device according to the present invention.
It is a figure showing an embodiment. 91 is a quartz arc tube of a U-shaped electrodeed low-pressure discharge lamp, 92 is an arc tube 91
Power supply transformer for supplying an alternating current to the
This is a cooling device for cooling the cooling device. The cooling device 93 includes a cooling block 931 made of stainless steel and the cooling block 931.
Cooling fin 932 and fan 9 attached to one end of
Consists of 33. The cooling block 931 and the cooling fins 932 are connected by the heat pipe 98 shown in FIG.

Next, the operation of this embodiment will be described. The arc tube 91 is of a type in which electric power supplied from a power transformer 92 is emitted from a cathode 921 and received by an anode 923 to maintain discharge. The cathode 921 is supplied with a filament preheating voltage from the power transformer 92.
The lower part of the arc tube near the electrode is in contact with the cooling block 931 of the cooling device 93 as shown in FIG. The cooling block 931 sends the heat of the arc tube to the cooling fins 932 through the heat pipe 98. This cooling fin 932 is
Since the vicinity of the electrode of the arc tube is cooled by the cooling device 93, the mercury 20 in the arc tube 91 is controlled between 30 ° C and 50 ° C.

Here, the vicinity of the electrode of the arc tube 91 is pressed by the pressing member 94 as shown in FIG. 10 to the lower side of the cooling block 931 as shown in FIG. still,
In FIG. 11, reference numeral 96 denotes a reflector, reference numeral 97 denotes a terminal plate for soldering a lead wire 95 coming out of the arc tube 91, and reference numeral 98 denotes a heat pipe for connecting a cooling block 931 and cooling fins 932 to transmit heat.

By the way, as shown in FIG. 12, the arc tube 91 may not completely contact the cooling block 931 and may be partially lifted due to manufacturing variations and variations in the supporting members. Assuming that the maximum distance of this floating (gap) is M mm, as shown in FIG.
From 0.6 mm to 0.6 mm, even if there is a float, the heat of the arc tube 91 is transmitted to the cooling block 931 side through the float and there is no hindrance to cooling, so that the mercury 20 is controlled between 30 ° C. and 50 ° C. It can be seen that the lamp characteristics maintain almost 100%.

According to the present embodiment, the mercury 20 in the arc tube 91 comes into contact with the arc tube 91 of the electrodeed low-pressure discharge lamp.
If the gap between the cooling block 931 for controlling the temperature and the arc tube 91 is 0.5 mm to 0.6 mm or less, the arc tube 91 can be sufficiently cooled, and the lamp characteristics can be maintained well.

It should be noted that even if the electrodeed low-pressure discharge lamp is a straight tube, the gap between the arc tube 91 and the cooling block 931 is 0.5 mm.
If it is from 0.6 mm to 0.6 mm, the arc tube 91 can be cooled sufficiently, and similarly, the lamp characteristics can be maintained well.

[0041]

As described above, according to the first aspect of the present invention, since the mercury reservoir is protruded from the arc tube, even if the electrodeless discharge lamp is hermetically housed in the protective tube, the mercury in the lamp can be reliably obtained. In this case, the electrodeless discharge lamp in the protection tube can be efficiently turned on.

According to the second aspect of the present invention, the distance between the mercury reservoir and the inner wall of the protective tube is set to a predetermined distance or more, and the mercury reservoir protrusion length L is set to an appropriate length according to the tube wall load of the arc tube. This ensures that the mercury in the mercury reservoir is cooled to the optimal temperature,
The electrodeless discharge lamp in the protection tube can be efficiently turned on.

According to the third aspect of the present invention, the protection tube accommodating the electrodeless discharge lamp is filled with a non-volatile gas such as argon, so that the mounting member such as the holding material of the electrodeless discharge lamp is deteriorated by ozone. Can be prevented, the life of the mount member can be extended to one year or more, and the durability of the device can be improved.

According to the fourth aspect of the present invention, since the mercury reservoir is protruded from the arc tube, the life of the mount member of the electrodeless discharge lamp can be extended to one year or more, and the electrodeless lamp in the protective tube can be extended. The discharge lamp can be efficiently turned on.

According to the fifth aspect of the present invention, since the electrodeless discharge lamp having the arc tube provided with the mercury reservoir is housed in the protective tube and used, ultraviolet rays are efficiently emitted from the electrodeless discharge lamp. In addition, the water to be treated can be efficiently sterilized.

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing a detailed configuration example of the arc tube shown in FIG.

FIG. 3 is an enlarged sectional view of the mercury reservoir shown in FIG. 2;

FIG. 4 is a view showing the relationship between the protrusion length of the mercury reservoir shown in FIG. 1 and the mercury temperature.

FIG. 5 is a characteristic diagram showing a relationship between mercury temperature and discharge lamp efficiency.

FIG. 6 is a side view showing the first embodiment of the discharge lamp lighting device of the present invention.

FIG. 7 is a side view showing a discharge lamp lighting device according to a second embodiment of the present invention.

FIG. 8 is a side view showing an embodiment of the liquid processing apparatus of the present invention.

FIG. 9 is a plan view showing a discharge lamp lighting device according to a third embodiment of the present invention.

10 is an enlarged top view of the vicinity of an electrode portion of the arc tube shown in FIG. 9;

11 is a partial side view of the discharge lamp lighting device shown in FIG.

FIG. 12 is an enlarged view showing a contact relationship between the arc tube and the cooling block shown in FIG. 9;

FIG. 13 is a characteristic diagram showing a relationship between a gap M shown in FIG. 12 and lamp characteristics.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 91 Arc tube 2 Induction coil 3 Mercury reservoir 4 Protection tube 5 Vessel 6 Packing 7, 43, 95 Lead wire 9 O-ring 10 Power supply device 20 Mercury 30 Nitrogen gas 40 Sterilization tank 41 Support member 42 High frequency power supply 50 Argon gas 51 Holder 52 Coil Holder 92 Power Transformer 93 Cooling Device 94 Holder 96 Reflector 97 Terminal Plate 98 Heat Pipe 111 Outer Tube 112 Medium Tube 113 Aluminum Oxide 401 Water Channel 402 Drainage Channel 921 Cathode 923 Anode 931 Cooling Block 932 Cooling Fin 933 Fan

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Akihiro Inoue Toshiba Lighting & Technology Corporation 4-3-1 Higashishinagawa Shinagawa-ku Tokyo

Claims (5)

[Claims] 1. An arc tube made of a translucent material in which a discharge medium containing mercury is sealed; an induction coil wound around the outer periphery of the arc tube; and the arc tube connected to an internal space of the arc tube. And a mercury reservoir protruding from the main body and storing the mercury. 2. When the arc tube and the induction coil are housed in a sealed protective tube and the mercury reservoir is separated from the inner wall of the protective tube by 10 mm or more when the arc tube is turned on, the mercury reservoir is closed. The protrusion length is L (mm), and the tube wall load of the arc tube is PW
/ Cm ² , when 0.1 ≦ P <0.3, 10 ≦
L ≦ 30, and when 0.3 ≦ P ≦ 0.5, 30 ≦ L ≦ 5
2. The electrodeless discharge lamp according to claim 1, wherein the value is set to zero. 3. An arc tube made of a translucent material enclosing a discharge medium containing mercury; an induction coil wound around the outer periphery of the arc tube; and at least an airtight housing for accommodating the arc tube and the induction coil. A discharge lamp lighting device comprising: a protective tube partially made of a translucent material and filled with an inert gas; and a high-frequency power supply for supplying a high-frequency current to the induction coil. 4. The discharge lamp lighting device according to claim 3, wherein a mercury reservoir for storing the mercury is protruded from the arc tube so as to be connected to an internal space of the arc tube. 5. An electrodeless discharge lamp according to claim 1, wherein said electrodeless discharge lamp is hermetically sealed and at least partly made of a light-transmitting material and a protective tube; and an induction coil of said electrodeless discharge lamp. 1. A liquid processing apparatus, comprising: a high-frequency power supply for supplying a high-frequency current; and a treatment tank containing the protective tube, into which water to be treated flows in, and from which treated water flows out.