JP3087566B2 - Dielectric barrier discharge fluorescent lamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp,
In particular, the present invention relates to a fluorescent lamp for information equipment such as a facsimile or a backlight of a liquid crystal display, and particularly to a so-called dielectric barrier discharge that forms excimer molecules by dielectric barrier discharge and uses light emitted from the excimer molecules. The present invention relates to an improvement in a dielectric barrier discharge fluorescent lamp used as an ultraviolet light source.

[0002]

2. Description of the Related Art As a technique related to the present invention, there is, for example, Japanese Patent Laid-Open Publication No. 2-7353, in which a discharge vessel is filled with a discharge gas for forming excimer molecules, and a dielectric material is filled. Excimer molecules are formed by barrier discharge (also known as ozonizer discharge or silent discharge; see the revised edition of “Discharge Handbook” published by the Institute of Electrical Engineers of Japan, reprinted on June 7, 2001, page 263), and the light emitted from the excimer molecules causes fluorescence. A lamp that excites a body, i.e., a dielectric barrier discharge fluorescent lamp, is described wherein the discharge vessel is cylindrical, at least a portion of the discharge vessel also serves as the dielectric for the dielectric barrier discharge, A dielectric barrier discharge fluorescent lamp is described in which the dielectric is light transmissive and at least a part of the dielectric is provided with a conductive mesh electrode. Further, a dielectric barrier discharge lamp having a configuration in which an electrode for dielectric barrier discharge is made of metal and the metal electrode is in contact with a discharge gas is disclosed in US Pat.
No. 638. The dielectric barrier discharge fluorescent lamp as described above is useful because it has various features not available in the conventional fluorescent lamp. However, the dielectric barrier discharge fluorescent lamp as described above is not necessarily compact in shape, and if the shape is compact, the power output to the lamp becomes insufficient due to insufficient power injected into the lamp, or discharge occurs. And the light output becomes unstable.

[0003]

It is an object of the present invention to provide a dielectric barrier discharge fluorescent lamp which is compact, has a sufficiently high light output and is stable.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to provide at least a light-transmitting material having a dielectric constant of E1 and a thickness of D1.
A discharge vessel also serving as a dielectric of a dielectric barrier discharge, a phosphor film provided on at least a part of an inner surface of the discharge vessel, and a dielectric film provided on at least a part of an outer surface of the discharge vessel. An outer electrode for performing a body barrier discharge, an inner electrode disposed inside the discharge vessel and formed of an elongated metal rod or an elongated metal tube, and a dielectric provided on the surface of the inner electrode or with a gap therebetween. A substantially tubular fluorescent lamp utilizing a second dielectric having a ratio of E2 and a dielectric barrier discharge comprising a discharge gas which forms excimer molecules by the dielectric barrier discharge filled in the discharge vessel.
The thickness of the second dielectric is 0.1 μm or more.
0.1 × E2 × D1 / E1 .

[0005] A first end of the inner electrode is hermetically attached to the first end of the discharge vessel and is drawn out of the discharge vessel. A second end of the inner electrode is connected to the discharge vessel. Wherein the second end of the inner electrode is fixed to the second end of the discharge vessel, and the second end of the inner electrode is fixed to the discharge vessel. The second end of the inner electrode is loosely held at the second end of the discharge vessel by a member that is loosely held at a second end of the discharge tube of the dielectric barrier discharge fluorescent lamp; The above-described object of the present invention can be further achieved by adopting a configuration that also serves as

Further, the dielectric barrier discharge fluorescent lamp is
Along the longitudinal direction on a part of the outer peripheral surface of the discharge vessel,
An aperture-type fluorescent lamp having a slit-shaped light-extracting portion, and a light-transmissive member electrically connected to the outer electrode and provided on an outer surface of the light-extracting portion. Placing the outer electrode on a portion of the outer peripheral surface of the discharge vessel, setting the light extraction portion at a position on the opposite side of the outer electrode, and placing the inner electrode more than the central axis of the discharge vessel. The outer electrode is provided on a part of the outer peripheral surface of the discharge vessel, the light extracting portion is located at a position opposite to the outer electrode, and the inner electrode is provided. The above-mentioned object of the present invention can be further achieved by providing a configuration in which the distance is set farther from the light extraction portion than the central axis of the discharge vessel.

Further, the discharge vessel is cylindrical, the inner electrode and a second dielectric covering the inner electrode are cylindrical, and the inner diameter of the discharge vessel is three times the outer diameter of the second dielectric. From 40
The outer electrode is provided over the entire outer peripheral surface of the discharge vessel, and the distance between the central axis of the inner electrode and the central axis of the discharge vessel is set to be larger than the outer diameter of the inner electrode. The object of the present invention can be further achieved by adopting an installed configuration and by forming the outer electrode with a seamless cylindrical metal mesh.

[0008]

As an important performance of a fluorescent lamp for information equipment such as a facsimile and a backlight of a liquid crystal display, compactness is required to make the whole equipment compact.
That is, it is required that the outer diameter is small and the ratio of the total length to the effective emission length is small. However, it is difficult to make the shape of the conventional dielectric barrier discharge fluorescent lamp compact, and even if the compact shape is achieved, the power injected into the lamp is insufficient and the light output is insufficient. Or the discharge becomes unstable and the light output becomes unstable.

FIG. 12 is a schematic view of a conventional dielectric barrier discharge fluorescent lamp, and the above-mentioned problems will be described. The discharge vessel 1 is made of glass and has an inner tube 22 and an outer tube 23.
Are coaxially arranged to form a hollow cylindrical shape. The phosphor 100 is coated on the inner surfaces of the outer tube 23 and the inner tube 22. On the outer surface of the outer tube 23, an electrode 24 for light-transmitting dielectric barrier discharge is provided. On the outer surface of the inner tube 22, an electrode 25 for dielectric barrier discharge serving also as a light reflection film formed by vapor deposition of aluminum is provided. Are provided respectively. At one end of the discharge vessel, a getter chamber 26 for accommodating a getter 27 is provided. In order to mechanically and chemically protect the electrode 25 formed by the deposition of aluminum,
A protective film 28 made of boron nitride is provided on the electrode 25. As described in the “Discharge Handbook”, a dielectric barrier discharge is a very small discharge plasma having a very small plasma diameter and a very short discharge duration (hereinafter referred to as a microplasma). There are numerous gatherings. When the discharge space 29 is filled with a discharge gas for forming excimer molecules by a dielectric barrier discharge, and a voltage is applied to the electrodes 24 and 25 by the AC power supply 21, a large number of microplasmas are stably generated in the discharge space. Light is emitted and the phosphor is excited by excimer light to emit visible light.

However, as is apparent from FIG. 12, first, two dielectrics 22, 23 exist between the electrodes,
In addition, since the protective film 28 for the electrode 25 is provided, it is extremely difficult to reduce the diameter of the fluorescent lamp. Second, even if the diameter can be reduced, the surface area of the inner tube 22 facing the discharge space 29 is reduced, so that the power injection amount into the discharge space 29 is reduced, and as a result, the light output is reduced. . Third, since the getter cannot be fixed because there is no metal in the discharge vessel 1, a getter storage chamber for storing the getter needs to be provided separately from the discharge space, and the overall length of the lamp becomes longer. And the like.

Before explaining the principle of the present invention, first, an outline of a general dielectric barrier discharge will be described. In a normal arc discharge such as a medium pressure arc discharge lamp or a high pressure arc discharge lamp of several tens of torr or more, only one discharge plasma exists in a discharge space, and one small electrode luminescent spot is generated on an electrode surface. That is, even if the area of the electrode is increased, a portion that substantially functions as an electrode is a very small portion. On the other hand, as described in the discharge handbook, in the dielectric barrier discharge,
Since a dielectric is inserted into the discharge path, the dielectric prevents the discharge plasma from converging into a single line, so that there are multiple discharge plasmas in the discharge space, and a large number of electrodes are formed over a wide area of the electrode. Bright spots will be uniformly present. One of the reasons why excimer light is emitted with high efficiency in a dielectric barrier discharge lamp is the existence of the above-mentioned multiple discharge plasmas. The injection of power into the discharge space when a dielectric is inserted in the discharge path is roughly based on a voltage applied to the discharge space, that is, a discharge maintaining voltage,
It is approximately proportional to the ratio of the voltage drop in the dielectric, that is, the ratio of the impedance of the discharge plasma to the impedance of the dielectric. In a dielectric barrier discharge lamp having a configuration in which two dielectrics are present across the discharge space, the effect of preventing the discharge plasma from converging into a single line is large,
Although multiple discharge plasmas are stably present, a stable light output can be obtained.On the other hand, since there are two dielectrics, power is hardly injected into the discharge space, and as a result, the light output is sufficient. Disadvantageously cannot be obtained. In contrast, in a dielectric barrier discharge lamp having only one dielectric, that is, a dielectric barrier discharge lamp having a structure in which one electrode is in contact with a discharge gas, power can be easily injected into a discharge space. On the other hand, since the effect of preventing the discharge plasma from converging into a single line is small, the discharge is temporarily concentrated at one point on the metal electrode in contact with the discharge gas, and the As a result, disadvantages such as unstable discharge, unstable light output, and reduced radiation efficiency of excimer light occur.

[0012] The present inventors have at least considered that they are light-transmitting,
An elongated tubular discharge container having a dielectric constant of E ₁ and a thickness of D ₁ serving also as a dielectric for dielectric barrier discharge, a phosphor film provided on at least a part of an inner surface of the discharge container, An outer electrode for performing a dielectric barrier discharge provided on at least a part of the outer surface of the discharge vessel, and disposed inside the discharge vessel,
An inner electrode formed of an elongated metal rod or an elongated metal tube, a _second dielectric having a dielectric constant of E2 provided on the surface of the inner electrode or with a gap, and filled in the discharge vessel; In a substantially tubular dielectric barrier discharge fluorescent lamp utilizing a dielectric barrier discharge composed of a discharge gas forming excimer molecules by the dielectric barrier discharge, krypton, xenon, a rare gas and a halogen, which are discharge gases, , And the effect of preventing discharge plasma from converging into a single line was examined in detail by varying the thickness D ₂ of the second dielectric. As a result, it has been found that when the thickness D2 of the _second dielectric material is set to 0.1 μm or more, the probability that the discharge plasma converges in one row is significantly reduced. In particular, the pressure of xenon or a mixed gas of rare gas and chlorine gas is 10 kPa or more and 20 kPa or more.
In the range of 0 kPa or less, the effect of preventing discharge plasma from converging in a single row is great, and is 20 kPa or more and 100 kPa
In the range of Pa or less, the effect of preventing the discharge plasma from converging into a single line was further significantly increased.

The capacitance of a capacitor having a structure in which a dielectric having a relatively small thickness, a dielectric constant of E and a thickness of D is sandwiched between electrodes is roughly proportional to E / D. When a plurality of capacitors are connected in series, the voltage applied to one capacitor is proportional to the capacitance of the capacitor. At least, a light-transmissive, elongated tubular discharge vessel having a dielectric constant of E1 and a thickness of D1 serving also as a dielectric for dielectric barrier discharge, and a fluorescent light provided on at least a part of the inner surface of the discharge vessel Body film, an outer electrode for performing a dielectric barrier discharge provided on at least a part of an outer surface of the discharge vessel, and an inner electrode disposed inside the discharge vessel and formed of an elongated metal rod or an elongated metal tube, The dielectric constant is E2 provided on the surface of the inner electrode or with a gap.
And a substantially tubular shape utilizing a dielectric barrier discharge composed of a discharge gas for forming excimer molecules by the dielectric barrier discharge filled in the discharge vessel.
In a dielectric barrier discharge fluorescent lamp, the second dielectric
Make the thickness D2 0.1 × E2 × D1 / E1 or less
And the voltage applied to the second dielectric is reduced to about 10% or less of the voltage applied to the first dielectric, so that the power injected into the discharge space increases, and The increase in the outer diameter including the inner electrode due to the coating of the dielectric is about 10%, that is, a compact dielectric barrier discharge fluorescent lamp having a large light output can be obtained.

That is, it is light-transmitting, has a dielectric constant of E ₁ ,
Of the elongate tubular wall thickness of D _1, a dielectric barrier and the discharge vessel which also serves as a dielectric of the discharge, and a phosphor film provided on at least a portion of the inner surface of the discharge vessel, at least one outer surface of the discharge vessel An outer electrode for performing a dielectric barrier discharge provided in the portion, an inner electrode disposed inside the discharge vessel and formed of an elongated metal rod or an elongated metal tube, and having a surface or a gap of the inner electrode. A substantially tubular structure utilizing a _second dielectric having a dielectric constant of E2 and a dielectric barrier discharge comprising a discharge gas that forms excimer molecules by the dielectric barrier discharge filled in the discharge vessel. In the dielectric barrier discharge fluorescent lamp, the thickness D ₂ of the second dielectric is set to 0.1 × E ₂ × D ₁ / E ₁ from 0.1 μm or more.
When configured in the following range, firstly, the phenomenon that the discharge plasma converges in a single line is less likely to occur, and therefore, the fluctuation of the light output is small, and secondly, the second dielectric material inserted in the discharge path Since the thickness is small and the protective film 28 is unnecessary, the diameter of the lamp can be easily reduced. Third, since the second dielectric covering the inner electrode having a small surface area is thin, sufficient power can be supplied to the discharge space. Therefore, a compact dielectric barrier discharge fluorescent lamp having a sufficiently high light output and a stable light output can be obtained.

The first end of the inner electrode is hermetically attached to the first end of the discharge vessel and is drawn out of the discharge vessel, and the second end of the inner electrode is inside the discharge vessel. First, the electrode lead wire exists only at one end, so that conversion can be achieved.Secondly, a high voltage is required to light the dielectric barrier discharge lamp,
It is necessary to take safety measures such as electrode leads to which high voltage is applied.However, by increasing the voltage of the inner electrode above, insulation measures can be completed at one end, and a more compact dielectric barrier discharge fluorescent lamp can be obtained. can get.

When the second end of the inner electrode is fixed to the second end of the discharge vessel, both ends of the inner electrode are supported, and the inner electrode is covered with a second dielectric material. The electrodes can be placed in a long and narrow discharge vessel while maintaining a precise positional relationship, and a dielectric barrier discharge fluorescent lamp with little variation can be obtained. The configuration in which the second end of the elongated inner electrode is loosely held at the second end of the discharge vessel simplifies firstly the manufacture, and secondly, as the elongated inner electrode, heats the discharge vessel. It is possible to use a metal having a coefficient of thermal expansion different from the coefficient of expansion, which has the advantage of increasing the degree of freedom in selecting constituent materials for the lamp. When the member for loosely holding the second end of the elongated inner electrode at one end of the discharge vessel is also used as the rest of the exhaust pipe of the dielectric barrier discharge fluorescent lamp, the manufacture is further facilitated and the cost is reduced. The advantage that arises.

An aperture-type fluorescent lamp of a type in which light is extracted from a slit-like light extraction portion provided on a part of the outer surface of the discharge vessel is a general type in which visible light is emitted almost uniformly from the entire outer circumference of the discharge vessel. Compared to a fluorescent lamp, the visible light emitted from the phosphor is reflected from the phosphor film and then emitted from the light extraction portion, so that it is more compact and has a higher output. Therefore, it is more important to make the electrode provided in the discharge vessel thinner, and it is necessary to inject a large electric power. The dielectric barrier discharge fluorescent lamp, characterized in that the inner electrode is composed of an elongated metal rod or an elongated metal tube coated with a relatively thin second dielectric, the aperture-shaped fluorescent lamp has a small absorption of light by the inner electrode. The above-mentioned features can be further exhibited by configuring the fluorescent lamp of the present invention.

When a member which is electrically connected to the outer electrode and which is transparent to light is provided on an outer surface of the light extraction portion, an electromagnetic noise radio wave generated by dielectric barrier discharge is generated by the light extraction portion. There is an advantage that leakage can be prevented. In the dielectric barrier discharge fluorescent lamp, the outer electrode is provided on a part of the outer peripheral surface of the discharge vessel, the light extraction part is located on a side opposite to the outer electrode, and the inner electrode is provided on the discharge vessel. When the configuration is provided farther from the light extraction portion than the central axis, the light extraction efficiency is increased because the inner electrode is separated from the light extraction portion, and the distance between the outer electrode and the inner electrode is shorter. Therefore, there is an advantage that the discharge starting voltage is reduced. In the dielectric barrier discharge fluorescent lamp, the outer electrode is provided on a part of the outer peripheral surface of the discharge vessel, the light extraction part is located on a side opposite to the outer electrode, and the inner electrode is provided on the discharge vessel. If the configuration is provided closer to the light extraction portion than the central axis, the distance between the outer electrode and the inner electrode is increased, and thus the discharge space can be increased, so that a large light output can be obtained with a thinner discharge vessel. The advantage that arises.

In the dielectric barrier discharge fluorescent lamp, wherein the discharge vessel is a cylinder and the inner electrode is a round bar or a tubular metal, the inner diameter of the cylindrical discharge vessel covers the inner electrode. When the outer diameter of the second dielectric is less than three times, the absorption of visible light by the inner electrode cannot be ignored,
Further, in a region exceeding 40 times the outer diameter of the second dielectric, there is a disadvantage that the discharge becomes unstable due to the imbalance of the electrode area between the inner electrode and the outer electrode. That is, the discharge vessel is a cylinder, the inner electrode and the second dielectric covering it are cylindrical, and the inner diameter of the discharge vessel is
By configuring the second dielectric in a range of 3 to 40 times the outer diameter, a dielectric barrier discharge fluorescent lamp having sufficient luminous efficiency and stable light output can be obtained.

[0020] In the dielectric barrier discharge fluorescent lamp, wherein the discharge vessel is cylindrical and the inner electrode and a second dielectric covering the same are cylindrical, the outer electrode extends over the entire outer peripheral surface of the discharge vessel. If the distance between the central axis of the inner electrode and the central axis of the discharge vessel is set to be greater than the outer diameter of the inner electrode, the distance between the inner electrode and the outer electrode becomes shorter. Therefore, there is an advantage that the discharge starting voltage is reduced, and the power supply for lighting is simplified. The effect of lowering the discharge starting voltage is significant when the distance between the central axis of the inner electrode and the central axis of the discharge vessel is greater than the outer diameter of the inner electrode.

When the outer electrode is formed of a seamless cylindrical wire mesh, there is no overlap between the edges of the wire mesh which occurs when a flat wire mesh is wound to form a cylindrical shape. The advantage is that the diameter is smaller.

[0022]

FIG. 1 shows a dielectric barrier discharge fluorescent lamp according to a first embodiment of the present invention. The discharge vessel 1 has a thickness of 1 mm,
It consists of a soda-lime glass tube with an outer diameter of 6 mm and a total length of 200 mm. The inner electrode 5 is hermetically attached to the first end 11 and the second end 12 of the discharge vessel 1 is hermetically closed. The inner electrode 5 is an empty rod of 0.8 mm in diameter made of an alloy of iron and nickel having a coefficient of thermal expansion close to that of soda-lime glass, coaxial with the discharge vessel 1, and having a second end 6 of the inner electrode. Present in the discharge vessel. The second dielectric body 101 is a quartz glass tube having a thickness of 0.08 mm and an outer diameter of 1 mm. That is, the inner electrode 5 is covered with a thin quartz glass tube which is the second dielectric material 101. E ₂ is the same as E ₁ and is about 3.8, and D ₂ is 0.08 mm.
₂ × D ₁ / E ₁ becomes 0.1 mm. That is, a thickness of 0.08 mm of the second dielectric 101 is within the scope of the present invention. A seamless stainless steel wire mesh is provided on the outer surface of the discharge vessel 1 as the outer electrode 4, and a phosphor 10 is provided on the inner surface.
LaPO ₄ : CeTb which emits green light as 0 was applied. The phosphor 100 is also applied inside the second end 12 of the discharge vessel 1. The first end of the inner electrode is the discharge vessel 1
And is connected to the power supply 21. Xenon was filled in the discharge vessel 1 as discharge gas at 30 kPa from an exhaust pipe provided near the first end 11. 3 is the rest of the exhaust pipe.

When a high frequency voltage of 20 kHz and 3 kV is applied between the outer electrode 4 and the inner electrode 5 by the power supply 21, stable dielectric barrier discharge is generated. As a result, vacuum ultraviolet light having a maximum value at a wavelength of 172 nm is generated. Emission was efficient and the phosphor 100 emitted light. The characteristics of the dielectric barrier discharge fluorescent lamp of this embodiment can be summarized as follows. First, the phenomenon in which the discharge plasma converges in a single line is less likely to occur, so that the light output fluctuates little. Third, since the diameter of the lamp is as thin as about 0.8 mm, the diameter of the lamp can be easily reduced. Third, since the elongated inner electrode having a small surface area is only covered with the thin second dielectric, it is sufficient for the discharge space. Power can be injected, and thus the light output is sufficiently large. Fourthly, since the light is emitted to the second end 12 of the discharge vessel 1, the ratio of the effective emission length of the lamp is increased, and thus the light output is large and stable. Thus, a compact dielectric barrier discharge fluorescent lamp was obtained.

FIG. 2 shows a dielectric barrier discharge fluorescent lamp according to a second embodiment of the present invention. The dimensions of the discharge vessel are the same as in the first embodiment. The inner electrode 5 has a hollow tubular shape, and has an advantage that the weight is reduced. Second dielectric material 101
Is aluminum oxide formed by a sol-gel method and has a thickness of 0.5 μm. Since the dielectric constant of aluminum oxide is as large as about 10, the elongated inner electrode 5 having a small surface area is
Since the second dielectric material 101 is thin and covered with the second dielectric material 101 having a high dielectric constant, there is an advantage that the electric power can be sufficiently injected into the discharge space and the light output can be sufficiently increased.

FIG. 3 shows a dielectric barrier discharge fluorescent lamp according to a third embodiment of the present invention. The structure of the lamp of this embodiment is different from that of the first embodiment in that the inner electrode 5
Is fixed by embedding the second end 6 in the second end 12 of the discharge vessel 1. Advantages such as easy alignment of the central axis of the discharge vessel 1 and the inner electrode 5 to obtain a lamp with less variation, and higher mechanical strength because both ends of the inner electrode 5 are fixed are obtained.

FIG. 4 shows a dielectric barrier discharge fluorescent lamp according to a fourth embodiment of the present invention. The structure of the lamp of the present embodiment is such that, in addition to the lamp structure of the first embodiment, the total length of the lamp is as long as 300 mm, and the second end 6 of the inner electrode 5 is provided.
Is inserted into the recess 7 provided in the second end 12 of the discharge vessel 1 and loosely held. In this embodiment, the manufacture of the lamp is facilitated, and even if the coefficient of thermal expansion between the inner electrode 5 and the discharge vessel 1 is slightly different, the difference is absorbed by the recess 7, so that the total length of the lamp is 300 mm.
Despite this, a highly reliable dielectric barrier discharge fluorescent lamp was obtained.

FIG. 5 shows a dielectric barrier discharge fluorescent lamp according to a fifth embodiment of the present invention. The structure of the lamp of the present embodiment is such that the recess 7 in the lamp structure of the fourth embodiment is also used as the remaining portion 3 of the exhaust pipe of the dielectric barrier discharge fluorescent lamp, and the manufacture is further facilitated. This has the advantage of being inexpensive. Further, a getter 2 made of a metal member is attached to the inner metal 5 near the first end by welding. Since no special getter chamber was required, a compact dielectric barrier discharge fluorescent lamp having a large emission length ratio was obtained.

FIG. 6 is a sectional view of a dielectric barrier discharge fluorescent lamp according to a sixth embodiment of the present invention. The lamp of the present embodiment has a configuration in which the discharge vessel 1 of the dielectric barrier discharge fluorescent lamp of the fifth embodiment is formed as a hollow elliptical cylinder. In addition to the advantages of the fifth embodiment, a thin dielectric barrier is provided. This has the advantage that a discharge fluorescent lamp is obtained.

FIG. 7 is a sectional view of an aperture type dielectric barrier discharge fluorescent lamp according to a seventh embodiment of the present invention. In the lamp of the present embodiment, an outer electrode 8 also serving as a light reflection plate made of aluminum is provided on a part of the outer peripheral surface of the discharge vessel 1, and the outer electrode 8 is provided on a part of the inner peripheral face of the discharge vessel 1. 8
In this configuration, the fluorescent material 100 is provided in contact with the outer electrode 8, and the tube wall portion where the outer electrode 8 and the fluorescent material 100 are not provided is the light extraction portion 9. This part 9
It extends like a slit along the longitudinal direction of the lamp. Since the inner electrode 5 provided in the discharge vessel 1 is thin and large power can be injected, it is possible to obtain an aperture-type dielectric barrier discharge fluorescent lamp which is compact and has a large light output.

FIG. 8 is a sectional view of an aperture type dielectric barrier discharge fluorescent lamp according to an eighth embodiment of the present invention. The lamp structure of the present embodiment has a configuration in which the discharge vessel 1 of the aperture type dielectric barrier discharge fluorescent lamp of the seventh embodiment is a hollow elliptical cylinder, and the light extraction portion 9 is provided at a position in the long axis direction. Since the discharge space can be made larger than the light extraction portion 9, an aperture type dielectric barrier discharge fluorescent lamp with higher luminance can be obtained.

The aperture type dielectric barrier discharge fluorescent lamp according to the ninth embodiment of the present invention is different from the aperture type dielectric barrier discharge fluorescent lamp according to the eighth embodiment in that the light extraction portion 9 is arranged in the short axis direction of the discharge vessel 1. This is a configuration provided at the position. There is an advantage that the light extraction portion 9 can be made larger than the thickness of the discharge vessel 1. That is, a thinner aperture type dielectric barrier discharge fluorescent lamp can be obtained.

FIG. 9 is a sectional view of an aperture type dielectric barrier discharge fluorescent lamp according to a tenth embodiment of the present invention. In the lamp of the present embodiment, a light reflecting film 10 made of calcium pyrophosphate is provided on a part of the inner peripheral surface of the discharge vessel 1 and a phosphor 100 is provided on the light reflecting film 10. The tube wall portion where the film 10 is not provided is a light extraction portion 9, and the outer electrode 4 made of a seamless cylindrical metal net is provided all around the outer surface of the discharge vessel 1. That is, the portion of the outer electrode 4 existing on the outer surface of the light extraction portion 9 is electrically connected to the outer electrode,
In addition, since it is a net, it corresponds to a light-transmitting member, and therefore, there is an advantage that electromagnetic noise radio waves generated by dielectric barrier discharge can be prevented from leaking from the light extraction portion.

FIG. 10 is a sectional view of an aperture type dielectric barrier discharge fluorescent lamp according to an eleventh embodiment of the present invention.
In the structure of the lamp of the present embodiment, the inner electrode 5 is connected to the discharge vessel 1.
The structure is the same as that of the seventh embodiment except that it is provided closer to the light extraction portion 9 than the central axis X of the first embodiment. Such a structure has the advantage of increasing the distance between the outer and inner electrodes, thus increasing the input to the lamp and therefore the light output.

FIG. 11 is a sectional view of an aperture type dielectric barrier discharge fluorescent lamp according to a twelfth embodiment of the present invention.
In the structure of the lamp of the present embodiment, the inner electrode 5 is connected to the discharge vessel 1.
The structure is the same as that of the seventh embodiment except that it is provided farther from the light extraction portion 9 than the central axis X of the second embodiment. With such a structure, the distance between the outer electrode and the inner electrode is shortened, so that the discharge starting voltage is lowered, and the inner electrode 5 is separated from the light extraction portion 9, so that the light Has an advantage that the take-out efficiency is increased and the efficiency is high.

In the dielectric barrier discharge fluorescent lamp according to the thirteenth embodiment of the present invention, the inner electrode 5 in the dielectric barrier discharge fluorescent lamp according to the first embodiment is shifted from the central axis of the discharge vessel 1 by 1.5 mm. This is the installed configuration. In this embodiment, there is an advantage that the discharge starting voltage is reduced.

[0036]

As described above, according to the present invention, it is possible to provide a dielectric barrier discharge fluorescent lamp which is compact, has a sufficiently large light output, and is stable.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of a dielectric barrier discharge fluorescent lamp of the present invention.

FIG. 2 is an explanatory view of another embodiment of the dielectric barrier discharge fluorescent lamp of the present invention.

FIG. 3 is an explanatory view of another embodiment of the dielectric barrier discharge fluorescent lamp of the present invention.

FIG. 4 is an explanatory view of another embodiment of the dielectric barrier discharge fluorescent lamp of the present invention.

FIG. 5 is an explanatory view of another embodiment of the dielectric barrier discharge fluorescent lamp of the present invention.

FIG. 6 is an explanatory view of another embodiment of the dielectric barrier discharge fluorescent lamp of the present invention, showing a cross section perpendicular to the longitudinal direction of the lamp.

FIG. 7 is an explanatory view of another embodiment of the dielectric barrier discharge fluorescent lamp of the present invention, showing a cross section perpendicular to the longitudinal direction of the lamp.

FIG. 8 is an explanatory view of another embodiment of the dielectric barrier discharge fluorescent lamp of the present invention, showing a cross section perpendicular to the longitudinal direction of the lamp.

FIG. 9 is an explanatory view of another embodiment of the dielectric barrier discharge fluorescent lamp of the present invention, showing a cross section perpendicular to the longitudinal direction of the lamp.

FIG. 10 is an explanatory view of another embodiment of the dielectric barrier discharge fluorescent lamp of the present invention, showing a cross section perpendicular to the longitudinal direction of the lamp.

FIG. 11 is an explanatory view of another embodiment of the dielectric barrier discharge fluorescent lamp of the present invention, showing a cross section perpendicular to the longitudinal direction of the lamp.

FIG. 12 is an explanatory view of a conventional dielectric barrier discharge fluorescent lamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Discharge container 2 Getter 3 Remaining part of exhaust pipe 4 Outer electrode 5 Inner electrode 6 Second end of inner electrode 7 Depression 8 Outer electrode 9 Light extraction portion 10 Light reflecting film 100 Phosphor 101 Second dielectric

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-223039 (JP, A) JP-A-3-201358 (JP, A) JP-A-5-190150 (JP, A) JP-A-5-190150 190152 (JP, A) JP-A-2-309552 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 65/00 H01J 65/04

Claims (12)

(57) [Claims] 1. An elongated tubular discharge vessel which is light-transmissive, has a dielectric constant of E1, and has a thickness of D1, and also serves as a dielectric for a dielectric barrier discharge, and at least a part of an inner surface of the discharge vessel. A phosphor film provided, an outer electrode provided on at least a part of an outer surface of the discharge vessel for performing a dielectric barrier discharge, and an inner side disposed inside the discharge vessel and comprising an elongated metal rod or an elongated metal tube. An excimer molecule is formed by the electrode, a second dielectric having a dielectric constant of E2 provided on the surface of the inner electrode or with a gap, and the dielectric barrier discharge filled in the discharge vessel. Induction of a substantially tubular shape using a dielectric barrier discharge composed of a discharge gas
In the electrical barrier discharge fluorescent lamp, the second dielectric
Thickness from 0.1 μm or more to 0.1 × E2 × D1 / E
1. A dielectric barrier discharge fluorescent lamp characterized by having the following range . 2. A first end of the inner electrode is hermetically attached to the first end of the discharge vessel and is drawn out of the discharge vessel, and a second end of the inner electrode is connected to the discharge end. 2. The dielectric barrier discharge fluorescent lamp according to claim 1, wherein the fluorescent lamp is arranged in a container. 3. The dielectric barrier discharge fluorescent lamp according to claim 2, wherein a second end of said inner electrode is fixed to a second end of said discharge vessel. 4. The dielectric barrier discharge fluorescent lamp according to claim 2, wherein a second end of said inner electrode is loosely held by a second end of said discharge vessel. 5. The dielectric of claim 4, wherein a second end of the discharge vessel has a remainder of an exhaust pipe, and wherein the second end of the inner electrode is loosely held by the remainder. Body barrier discharge fluorescent lamp. 6. The dielectric barrier discharge fluorescent lamp according to claim 1, wherein the fluorescent lamp is an aperture type fluorescent lamp having a portion for extracting light in a slit shape along the longitudinal direction of the discharge vessel. . 7. The dielectric according to claim 6, wherein a member that is electrically connected to the outer electrode and that is transparent to light is provided on an outer surface of the light extraction portion. Barrier discharge fluorescent lamp. 8. The method according to claim 1, wherein the outer electrode is provided on an outer surface of a portion of the discharge vessel opposite to the slit-like light extraction section, and the inner electrode is closer to the light extraction section than the central axis of the discharge vessel. 7. The dielectric barrier discharge fluorescent lamp according to claim 6, wherein the fluorescent lamp is provided. 9. An outer electrode is provided on an outer surface of a portion of the discharge vessel opposite to a slit-like light extraction section, and the inner electrode is provided farther from the light extraction section than a center axis of the discharge vessel. 7. The dielectric barrier discharge fluorescent lamp according to claim 6, wherein the fluorescent lamp is configured as described above. 10. The discharge vessel is a cylinder, the inner electrode is a round bar or a circular tube, and the inner diameter of the discharge vessel is in the range of 3 to 40 times the outer diameter of the second dielectric. 2. The fluorescent lamp as claimed in claim 1, wherein the fluorescent lamp is a fluorescent lamp. 11. The outer electrode is provided around the entire outer surface of the discharge vessel, and the distance between the central axis of the inner electrode and the central axis of the discharge vessel is set to be larger than the outer diameter of the inner electrode. 11. The dielectric barrier discharge fluorescent lamp according to claim 10, wherein the fluorescent lamp is configured. 12. The dielectric barrier discharge fluorescent lamp according to claim 1, wherein said outer electrode is made of a seamless cylindrical wire mesh.