JP2006294277A - Electrodeless discharge lamp and electrodeless discharge lamp device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing structure and a fixing structure of a discharge lamp that are effective for improving efficiency in an electrodeless discharge lamp and a lighting device using it. <P>SOLUTION: The electrodeless discharge lamp 8 has a sealing section 10 at least at one edge, and a discharge lamp 3A for emitting light without any electrodes. The electrodeless discharge lamp 8 has an electromagnetic wave irradiation section 4A having an excitor for introducing electromagnetic waves to the discharge lamp 3A, and a waveguide 5 including a conductor for transmitting electromagnetic waves to the electromagnetic wave irradiation section 4A. The sealing section 10 is arranged in the waveguide 5A, and the influence to emitted light by the sealing section is eliminated, thus fixing the discharge lamp easily and reliably. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technique for sealing and fixing a discharge tube in an electrodeless discharge lamp having no electrode in the discharge tube (arc tube).

  There are known electrodeless discharge lamps that do not have electrodes in the discharge space, and are not subject to lamp life limitations due to exhaustion of filaments or electrodes, there is no heat loss from the electrodes, and there are no enclosures in the discharge tube. It is not necessary to consider the reaction with the electrode material, and a luminescent substance suitable for improving efficiency can be used.

  By the way, there is a difficult problem to be solved for practical use in order to realize a small light source that requires light distribution control, such as lighting for automobiles. For example, in a method using a cavity resonator, when a microwave is oscillated by a magnetron and an electrodeless discharge tube in the cavity resonator is caused to emit light via a waveguide, the minimum dimension of the cavity resonator is an electromagnetic wave. It is determined in principle by the frequency.

  In addition, it is necessary to solve the problem of electromagnetic noise generated accompanying the use of high-frequency current, and the method of installing an electromagnetic shielding means (for example, a wire mesh etc.) reduces efficiency and deteriorates light distribution performance. There are concerns about the impact. That is, it is desirable not to arrange a shield, a coil or the like that blocks light around the discharge tube.

  In order to excite the luminescent material in the discharge tube, a small, high-efficiency electrodeless discharge lamp that meets such demands has a locally strong high-frequency electric field from a slit formed at the end of the coaxial tube. There has been known a lamp that generates a shielding effect of electromagnetic waves using surface wave plasma that is generated and excited thereby (see, for example, Patent Document 1). Since the coaxial tube is not limited in size by frequency (also referred to as having no cut-off frequency), a discharge tube having the same size as the diameter of the coaxial tube can be used.

JP 2003-197156 A

  By the way, in the electrodeless discharge lamp, there is a problem in the sealing structure of the discharge tube and the structure for fixing or supporting the discharge lamp in the electromagnetic wave irradiation portion that irradiates the discharge tube with electromagnetic waves. That is, if the structure at this part becomes complicated, it may cause a reduction in light utilization efficiency. For example, when the discharge tube is formed of a glass material such as quartz glass, first, a hole is formed in a part of the discharge tube or a glass thin tube is connected, and then an enclosed gas such as argon or xenon and iodine are added. The chemical pellets are put, and finally the step of sealing the above holes and glass capillaries with a burner is performed using a shrink seal or pinch seal method. Regarding the formation of the sealing portion, it is necessary to seal the gas and pellets with a burner so as not to affect the gas and pellets, which is essential for a discharge lamp, and the structure becomes complicated. . Therefore, the sealing portion inhibits light emitted from the inside of the discharge tube to the outside, and as a result, efficiency is reduced.

  This also applies to the case where the discharge tube is manufactured from a ceramic material. That is, in the case of using a ceramic material, an introduction tube for containing the sealed gas and iodide pellets is formed in a part of the discharge tube by integral molding, and after inserting them from the introduction tube, the tip of the introduction tube is A step of sealing with low melting point glass or the like is performed. Also in this case, the sealing portion is essential in the discharge tube and the structure becomes complicated, and it becomes a problem that the sealing portion obstructs light emitted from the discharge tube to the outside.

  Further, in the form having a slit (slot antenna portion) between the outer conductor and the inner conductor constituting the waveguide, when the creeping distance at the part is short, the occurrence of abnormal discharge becomes a problem.

  Accordingly, an object of the present invention is to provide a discharge tube sealing structure and a fixing structure that are effective in improving efficiency in an electrodeless discharge lamp and a lighting device using the same.

  The present invention has an exciton for introducing an electromagnetic wave into a discharge tube in an electrodeless discharge lamp and an electrodeless discharge lamp apparatus using a discharge tube that has a sealing portion at least at one end and emits light without an electrode. An electromagnetic wave irradiation part and a waveguide including first and second conductors for transmitting electromagnetic waves to the electromagnetic wave irradiation part, and a sealing extension or a sealing extension for forming the sealing part are guided. It has the structure arrange | positioned inside the wave tube.

  Accordingly, in the present invention, the sealing portion or the sealing extension portion is disposed inside the waveguide that does not have a possibility of affecting the emitted light, for example, inside the first conductor or the second conductor. By adopting, the effective light emission area of the discharge tube can be increased and the emission efficiency can be increased. Then, by introducing a sealing portion or a sealing extension into the waveguide and integrating the electromagnetic wave irradiation portion at the end of the waveguide, the discharge tube can be fixed easily and reliably. It can be carried out.

  According to the present invention, the light utilization efficiency is improved by eliminating the influence on the emitted light by the sealing portion of the discharge tube, and it is effective for simplifying and facilitating the structure for fixing the discharge tube to the waveguide. And the concealment effect that the sealing part or the extension part for sealing is not exposed to the external appearance of a discharge lamp is acquired.

  In the configuration in which the excitons are formed by the slit between the first conductor and the second conductor, the protrusion formed integrally with the discharge tube is positioned in the slit to thereby form the first conductor. And a sufficient creeping distance between the second conductor and the second conductor can be secured. In other words, discharge is likely to occur when the conductors are close to each other in the exciton, but the projection formed integrally with the discharge tube is interposed in the slit, and the discharge between the conductors is cut off to prevent abnormal discharge. Thus, the original light emission of the discharge tube can be reliably performed.

  Further, in the form using the ceramic tubular member for the waveguide, the outer peripheral surface of the tubular member is covered with the first conductor, and the inner peripheral surface of the tubular member is covered with the second conductor, or It is preferable that the conductor covered on the outer peripheral surface of the sealing extension portion is configured to form a part of the second conductor. That is, a configuration in which a ceramic tubular member having a low thermal conductivity is interposed between the coated conductors is effective in improving the efficiency of the discharge tube as compared with the case where a metal material is used. Further, by using a ceramic material, it is possible to increase the degree of freedom in designing the shape of the discharge lamp.

  When considering the ease of mounting and energization of the discharge lamp, a conductive coating is formed on the outer peripheral surface of the sealing extension inserted into the waveguide, and the conductive coating is applied through the connecting member. The structure electrically connected to the two conductors (inner conductors) is preferable.

  In an electrodeless discharge lamp in which the discharge tube is made of quartz glass, a sealing extension extending in a cylindrical shape from the sealing portion includes a cylindrical first conductor and a central axis of the first conductor. The structure arrange | positioned between the 2nd conductors located along is preferable. That is, by interposing the sealing extension between the first conductor and the second conductor, discharge between the conductors can be reliably prevented. Also, the use of quartz glass is effective in improving the efficiency when using microwaves because of its low dielectric constant.

  The present invention can be applied to various light sources that require light distribution control. For example, in light sources for vehicle headlights and beacon lights, light sources for road lighting, traffic lights, etc., store display lighting, light sources for projector devices, etc. Can be provided, and it is a small light source such as a cylindrical shape or a spherical shape, and a configuration in which a member that shields or diffuses light is not disposed around the light source can be provided.

  FIG. 1 is an explanatory view showing a basic configuration example of an electrodeless discharge lamp device according to the present invention.

  The electrodeless discharge lamp device 1 includes a power supply unit 2 for generating electromagnetic waves, a discharge tube 3 that emits light without electrodes by discharge, and an electromagnetic wave irradiation unit 4 that includes excitons for introducing electromagnetic waves into the discharge tube 3. .

  The power supply unit 2 includes, for example, an oscillation unit that generates electromagnetic waves in the microwave band (1 to 100 GHz) and uses a magnetron. However, the present invention is not limited to this, and a semiconductor switching element (such as an FET or a bipolar transistor) is used. It is possible to use a high-frequency amplifier device or the like that is used.

The discharge tube 3, for example, formed in a hollow cylindrical shape with a ceramic or quartz glass or the like, a gas such as given encapsulating material (xenon or argon into the tube, NaI and ScI metal iodide such as _3, metal bromide Etc.) are filled. Moreover, the form which apply | coats a fluorescent substance to the inner surface or outer surface of a discharge tube as needed is possible. In addition, although a torus shape having a center hole, a double tube structure, or a structure in which a concave portion is formed in the center of a cylindrical shape may be used, when a discharge tube is attached to the tip of a coaxial tube or a coaxial cable, A shape that can be reduced in size by reducing the outer diameter of the discharge tube, such as a cylindrical tube, is preferable.

  The electromagnetic wave irradiation unit 4 has a function as a launcher for introducing electromagnetic waves into the discharge tube 3, and the discharge tube 3 is attached to the end of the electromagnetic wave irradiation unit 4. For the waveguide 5 that connects the electromagnetic wave irradiation unit 4 and the power supply unit 2, for example, a coaxial tube or a coaxial cable is used. In consideration of the degree of freedom in arrangement, it is preferable to use a material having high flexibility.

  Reflected wave detection means 6 is provided on the waveguide 5 to detect a reflected wave propagating from the discharge tube 3 to the power supply unit 2 side. Then, the measurement result is sent to the output control means 7.

  The output control means 7 controls the output of the power supply unit 2 to minimize the reflection loss by adjusting the impedance matching based on the measurement information from the reflected wave detection means 6. In other words, in a configuration in which the power supply unit 2 and the electromagnetic wave irradiation unit 4 are connected using a coaxial tube or a coaxial cable, the level of the reflected wave becomes large as it is in the case of a high frequency, and power cannot be efficiently supplied to the discharge tube 3. An increase in power loss becomes a problem. Therefore, power is supplied to the discharge tube 3 by suppressing reflected waves using a device for impedance matching between the power supply unit 2 and the discharge tube 3 (for example, a matching device using a sleeving tuner or the like). Can be performed efficiently. Specifically, the LC component of the waveguide circuit (L: inductive component, C: capacitive component) is adjusted based on the detection information of the reflected wave so that the reflection loss is minimized (the reflected wave is sufficiently reduced). Matching is performed between the output impedance of the power supply unit 2 and the impedance of the discharge tube 3.

  For example, in a configuration in which an exciter is connected to a discharge tube through a magnetron, an isolator, an attenuator, a directional coupler, a slew tab tuner, a coaxial waveguide converter, and a coaxial tube in this order, a slot antenna is provided at the end of the coaxial tube. Is located (this part is called “exciton”), and the discharge tube is fixed to this. The isolator serves to prevent the reflected wave from returning to the magnetron, and the directional coupler is a device for allowing the electromagnetic wave to travel only in one direction.

  A strong high-frequency electric field generates high-density plasma in the discharge tube and shifts to a lighting state, and the high-frequency electric field from the coaxial tube becomes a traveling wave and is introduced into the discharge tube to continue lighting.

  Since a high-frequency electric field is not allowed to enter the high-density plasma (the density at this time is referred to as “blocking density”), the high-frequency electric field becomes a surface wave mode between the dielectric discharge tube and the plasma. It propagates while generating plasma (this is called "surface wave plasma").

  Even when a high frequency electric field is applied only to a part of the discharge tube, the plasma is uniformly generated in the discharge tube by the surface wave plasma. Therefore, if the discharge tube is defined in a shape required for light distribution control, Light emission in the entire shape is possible (that is, a light source suitable for light distribution control can be realized).

  Moreover, in a normal discharge tube having an electrode, the vapor pressure of the luminescent material, and hence the amount of luminescence, is determined by the low-temperature part (the base part of the electrode, the lower part of the discharge tube, etc.), so that the efficiency limit is limited. Naturally, in the form using surface wave plasma, plasma is uniformly generated in the discharge tube, and the temperature distribution in the discharge tube becomes uniform, contributing to the improvement of efficiency.

  A semiconductor element such as a diode is used to detect electromagnetic waves, and incident waves and reflected waves can be measured by the detected current. For example, in the transition period from the start of lighting of the discharge tube to the steady lighting by attaching each detecting element for incident and reflection to the directional coupler and adjusting the impedance matching based on the detection result Electric power can be supplied to the discharge tube without loss. In addition, it is possible to realize efficient and stable lighting by suppressing reflection loss with respect to characteristic changes caused by aging and life.

  In the example of FIG. 1, the power supply unit 2 and the output control unit 7 are shown separately. However, the present invention is not limited to this, and the configuration in which the output control unit 7 is included in the power supply unit (that is, the power supply unit itself is It has an output control function).

  Next, the following configuration of the electrodeless discharge lamp will be described with reference to FIGS.

(I) Configuration in which discharge tube sealing portion and sealing extension are arranged in the waveguide (II) Configuration in which discharge tube sealing extension is arranged in the waveguide

  For example, ceramic or quartz glass is used as the material of the electrodeless discharge tube. In the case of ceramic, the above (I) is adopted, and in the case of quartz glass, the above (II) is adopted. However, in any configuration, the influence on the emitted light by the sealing portion of the discharge tube can be eliminated. .

  2 to 4 show configuration examples using a transparent ceramic material for the discharge tube.

  The electrodeless discharge lamp 8 shown in FIG. 2 has a structure in which the discharge tube 3A is fixed to the waveguide 5A, and the waveguide 5A is connected to a power source (not shown) via a coaxial cable or the like.

  The discharge tube 3A has a cylindrical tube 9 whose outer diameter is approximately the same as the outer diameter of the waveguide 5A, and a sealing portion 10 at one end thereof. The sealing portion 10 is an end portion of the sealing extension portion 11 in a state where the rod-like member 12 is inserted into the sealing extension portion (or sealing leg portion) 11 having a smaller diameter than the cylindrical tube 9 (see FIG. Is formed by sealing the lower end portion of the substrate with a low melting point glass 11a. The discharge space in the cylindrical tube 9 is filled with a predetermined substance. Of the rod-shaped member 12 made of ceramic, the end opposite to the end sealed with the low melting point glass 11a is formed. It is defined at a position where it does not enter the discharge space, and by narrowing the gap (clearance) formed between the rod-like member 12 and the sealing extension 11, the substance is refused from entering when the light is extinguished. It has a function to prevent the water from accumulating.

  In this example, the conductor 11b (conductive film) coated on the outer peripheral surface of the cylindrical sealing extension 11 is coated, and other positions are provided near the end of the sealing extension 11. A small-diameter portion 11c having a smaller outer diameter than that of the portion is formed. Further, in the cylindrical tube 9, an annular protrusion 9 a (or rib) is integrally formed in the vicinity of the base portion of the sealing extension 11.

  For the electromagnetic wave irradiation unit 4A having excitons, a waveguide 5A including first and second conductors is used to transmit electromagnetic waves, and the sealing unit 10 and the sealing extension 11 are guided. Arranged inside the wave tube 5A.

  The waveguide 5A is configured using a dielectric and a pair of conductors. In this example, a ceramic tubular member 13 is used as an outer tube, and an outer peripheral surface thereof is covered with a first conductor (outer conductor) 14, and the inner conductor is formed in the cavity of the tubular member 13. Two conductors 15 are provided. Examples of the second conductor 15 include a form in which a conductive film is formed on the outer peripheral surface of the dielectric, a form using a hollow pipe made of a conductive material, and the like.

  The end 15a of the second conductor 15 is electrically connected to the conductor 11b via a connecting member 16 formed of a conductive material such as metal, and thereby the outer periphery of the sealing extension 11 The conductor 11b coated on the surface constitutes a part of the inner conductor. The second conductor 15 is extended to the root of the sealing extension 11 through a connection member 16 such as a connector.

  The excitons are formed as a slot antenna portion by a slit 17 formed between the end portion of the first conductor 14 and the end portion of the conductor 11b, and the protrusion 9a of the discharge tube 3A is formed in the slit 17. Be positioned. A step 13a is formed at the end of the tubular member 13, and the discharge tube 3A is supported in a state where the end of the protrusion 9a (lower end in the figure) is in contact with the step 13a. As described above, the protrusions 9a made of the same material (dielectric material) as the discharge tube are interposed between the conductor 14 and the conductor 11b, so that a sufficient creeping distance is ensured, thereby obtaining an effect of preventing abnormal discharge between the conductors. be able to.

  As described above, the conductor 11b covered with the sealing extension 11 of the discharge tube 3A is integrated as a part of the inner conductor to fix the discharge tube and to seal the sealing portion in the waveguide 5A. 10 and the sealing extension 11 can be arranged so that they do not adversely affect the light utilization efficiency.

  In this example, a conductive coating is formed on the outer peripheral surface of the sealing extension 11, the conductive coating is electrically connected to the second conductor 15 through the connection member 16, and the sealing extension 11 is configured to be held by the connecting member 16 so that the discharge tube 3A can be easily attached, replaced, and energized. However, in the application of the present invention, the sealing extension 11 is used as the internal conductor. In various forms, such as attaching to the base material (dielectric material) with glass or an adhesive, or forming a fastening portion such as a screw on the sealing extension 11 and attaching it to the internal conductor or the base material. Implementation is possible.

  Further, as in the configuration example shown in FIG. 3, a screw portion 18 is formed on the outer peripheral surface of the protrusion 9 a of the discharge tube 3 A, and a screw groove corresponding to the screw portion 18 is formed on the inner peripheral surface of the end portion of the tubular member 13. When the discharge tube 3 </ b> A is attached to the tubular member 13 by forming 19, the screw portion 18 may be screwed into the screw groove 19 in a state where the protrusion 9 a is positioned in the slit 17.

  Alternatively, the protrusion 9a is bonded to the end of the waveguide, or fixed by press-fitting or fitting, or fixed using an intermediate member such as a connector or a base or an engaging member. A configuration may be mentioned, but in consideration of replacement of the discharge tube, maintainability, and the like, a mounting form by screwing or engagement is preferable.

  In the example shown in FIGS. 2 and 3, the sealing extension 11 of the discharge tube 3 </ b> A is covered with a conductor. However, the configuration is not limited to this, and a tubular shape like the electrodeless discharge lamp 20 shown in FIG. 4 is used. A configuration in which an inner conductor is formed on the inner peripheral surface of the member 13 is also possible. That is, the difference from the above-described configuration is as follows.

The second conductor 15 is coated on the inner peripheral surface of the tubular member 13.
-The outer peripheral surface of the sealing extension 11 constituting the discharge tube 3B is not covered with a conductor, has no small diameter portion 11c, and does not require the connecting member 16.
An annular recess 13b corresponding to the protrusion 9a of the discharge tube 3B is formed at the end of the tubular member 13 constituting the waveguide 5B.

  In this example, in the tubular member 13, a waveguide 5 </ b> B whose outer peripheral surface is covered with a conductor 14 and whose inner peripheral surface is covered with a conductor 15 is used. One end of the conductor 14 extends to the outer peripheral edge of the end surface of the tubular member 13, and one end of the conductor 15 extends to the inner peripheral edge of the end surface of the tubular member 13, both of which are conductive. It is formed as a film.

  And the slit 17 which comprises the electromagnetic wave irradiation part 4B is formed between the conductor 14 and the conductor 15 in the edge part of the tubular member 13, and this is used for a slot antenna part. The protrusion 9a of the discharge tube 3B is press-fitted into or fitted into the annular recess 13b or fixed by bonding or the like, and a sufficient creepage distance between the conductors 14 and 15 is secured, so that there is an abnormality between the conductors. The effect of preventing discharge is obtained. Further, the discharge tube is positioned by aligning the protrusion 9a with the annular recess 13b.

  The tubular member 13 is provided with a member 21 formed of a dielectric material along its central axis. For example, a sealing portion is fastened to the member with a screw or the like, or is fixed by bonding or the like. The structure form to do is mentioned.

  When the discharge tube is formed of a ceramic material, a method of sealing the end of the sealing extension with low-melting glass is employed. However, when the discharge tube is formed of quartz glass, FIG. As shown in FIG. 6, it has a structure sealed by a shrink seal, a pinch seal method or the like.

  FIG. 5 shows a configuration example of the electrodeless discharge lamp 22.

  The discharge tube 3C has a cylindrical tube 23 whose outer diameter is approximately the same as the outer diameter of the waveguide 5C, and a sealing portion 24 is formed at one end thereof by a shrink seal or the like.

  A sealing extension 25 extending in a cylindrical shape from the sealing portion 24 is provided with a slit 28 (an electromagnetic wave irradiation portion 4C formed between the first conductor 26 and the second conductor 27 constituting the waveguide 5C. To the inside of the waveguide 5C. In this example, the cylindrical first conductor 26 is used as an external conductor, and for example, a hollow pipe using a conductive material is used, and its end section is formed in an L shape. The second conductor 27 positioned along the central axis of the conductor 26 is used as an inner conductor, and a conductive film is formed on the conductor, for example, on a metal rod, a metal pipe, or a quartz glass substrate. The member etc. which were done are used. The waveguide 5C is connected to a power supply unit (not shown) via a coaxial cable or the like.

  The sealing portion 24 of the discharge tube 3C is located in the vicinity of the end face of the waveguide 5C, and the sealing extension 25 extending from the sealing portion 24 is guided from the slit 28 between the conductor 26 and the conductor 27. By being introduced into the wave tube 5C and interposed between the two conductors, a sufficient creepage distance between the conductors can be secured, and abnormal discharge can be prevented.

  As the fixing and supporting structure of the discharge tube 3C, for example, as in an electrodeless discharge lamp 29 shown in FIG. 6, a support member 30 is attached to the end of the waveguide 5C, and a sealing extension of the discharge tube 3C is provided. An example in which 25 is held is given (the same reference numerals are used for the same functional parts as the respective parts of the electrodeless discharge lamp 22).

  In this example, a metal base is used as the support member 30, and a portion 30 a that is externally fitted to the first conductor 26 and a portion 30 b that is internally fitted to the conductor 26 are integrally formed. An insertion hole 30c is formed inside 30b.

  An engagement protrusion 25a is formed on the outer peripheral surface of the sealing extension 25, and an engagement hole 31 corresponding to the engagement protrusion 25a is formed in the portion 30b.

  After attaching the support member 30 to the end of the waveguide 5C, the sealing extension 25 of the discharge tube 3C is inserted into the waveguide 5C from the insertion hole 30c, so that the gap between the conductor 26 and the conductor 27 is increased. The sealing extension 25 is disposed on the surface.

  The fixing and supporting of the sealing extension 25 is not limited to this example, and a configuration in which a supporting protrusion is formed on the portion 30b of the support member 30 and is brought into contact with the sealing extension 25. Alternatively, the present invention can be implemented in various forms such as bonding the sealing extension to the conductor or the fixing member with an adhesive or glass without using a support member.

  Moreover, regarding the structure of the electromagnetic wave irradiation unit suitable for heat insulation of the discharge tube, for example, the following forms can be given.

・ Internal conductor with heat resistance and low thermal conductivity insulator (glass, ceramic, etc.), metal foil plate or metal film formed on the outer peripheral surface ・ Heat resistance on external conductor A structure in which an insulator (such as glass or ceramic) having low thermal conductivity is used and a metal foil plate or a metal film is formed on the outer peripheral surface or inner peripheral surface thereof.

  The electrodeless discharge lamp described above is effective in improving the emission efficiency, fixing the discharge tube, preventing abnormal discharge, and improving the efficiency by insulating the discharge tube. For example, the following advantages are obtained.

-The discharge tube can be easily fixed to the electromagnetic wave irradiation portion at the end of the waveguide, and positioning to the electromagnetic wave irradiation portion can be performed by the protrusion (9a) formed on the discharge tube.
-It is possible to prevent discharge at the slit by positioning the protrusion formed on the discharge tube within the slit of the electromagnetic wave irradiation unit.
-By arranging the sealing part or sealing extension in the waveguide, it is possible to have a structure in which no sealing part is provided on the end face of the discharge tube opposite to the electromagnetic wave irradiation part, and the light extraction efficiency is good. .
-The efficiency of the discharge tube should be improved by providing a material (dielectric) having a low thermal conductivity such as a ceramic pipe between the conductors constituting the waveguide.
-In a configuration using a quartz tube having a low dielectric constant, a sealing extension is interposed between the outer conductor and the inner conductor to sufficiently insulate and prevent discharge between the two conductors.

It is explanatory drawing which shows the basic structural example of the electrodeless discharge lamp apparatus which concerns on this invention. It is a figure which shows the cross-sectional structural example of the electrodeless discharge lamp which concerns on this invention. It is a figure which shows an example in the case of attaching a discharge tube to the waveguide edge part. It is a figure which shows another example of the electrodeless discharge lamp which concerns on this invention. It is a figure which shows another example of the electrodeless discharge lamp which concerns on this invention. It is a figure which shows the example of attachment to the waveguide edge part of a discharge tube.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electrodeless discharge lamp apparatus, 2 ... Power supply part 3, 3A, 3B, 3C ... Discharge tube 4, 4A, 4B, 4C ... Electromagnetic wave irradiation part 5, 5A, 5B, 5C ... Waveguide, 8 ... Electrodeless discharge lamp, 9a ... projection, 10 ... sealing portion, 11 ... sealing extension, 11b ... conductor covered on outer peripheral surface of sealing extension, 13 ... tubular member, 14 ... first Conductor, 15 ... second conductor, 16 ... connecting member, 17 ... slit, 20 ... electrodeless discharge lamp, 22 ... electrodeless discharge lamp, 24 ... sealing part, 25 ... extension part for sealing, 26 ... first 27 ... second conductor 28 ... slit 29 ... electrodeless discharge lamp

Claims (6)

In an electrodeless discharge lamp having a sealing part at least at one end and using a discharge tube that emits light without an electrode,
An electromagnetic wave irradiation unit having excitons for introducing electromagnetic waves into the discharge tube;
A waveguide including first and second conductors for transmitting electromagnetic waves to the electromagnetic wave irradiation unit,
The electrodeless discharge lamp, wherein the sealing portion or a sealing extension for forming the sealing portion is disposed inside the waveguide. In the electrodeless discharge lamp according to claim 1,
The excitons are formed by a slit between the first conductor and the second conductor;
An electrodeless discharge lamp, wherein a protrusion formed integrally with the discharge tube is positioned in the slit. In the electrodeless discharge lamp according to claim 1 or 2,
A ceramic tubular member is used for the waveguide, and an outer peripheral surface of the tubular member is covered with the first conductor, and an inner peripheral surface of the tubular member is covered with the second conductor. An electrodeless discharge lamp, wherein a conductor covered on an outer peripheral surface of a sealing extension portion constitutes a part of the second conductor. In the electrodeless discharge lamp according to claim 1 or 2,
A conductive coating is formed on the outer peripheral surface of the sealing extension inserted into the waveguide, and the conductive coating is electrically connected to the second conductor via a connecting member. An electrodeless discharge lamp characterized by In the electrodeless discharge lamp according to claim 1,
The discharge tube is made of quartz glass, and a sealing extension extending in a cylindrical shape from the sealing portion is positioned along the cylindrical first conductor and the central axis of the first conductor An electrodeless discharge lamp, wherein the electrodeless discharge lamp is disposed between the second conductor and the second conductor. A power source for generating electromagnetic waves, a discharge tube having a sealing portion at least at one end and emitting light without electrodes, an electromagnetic wave irradiation unit including excitons for introducing electromagnetic waves into the discharge tube, and the electromagnetic wave irradiation unit In an electrodeless discharge lamp device comprising a waveguide for transmitting electromagnetic waves to
An electrodeless discharge lamp device, wherein the sealing portion or a sealing extension for forming the sealing portion is disposed inside the waveguide.

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