JP4987642B2 - Coaxial waveguide with plug - Google Patents

Description

  The present invention relates to a coaxial waveguide that guides electromagnetic waves generated from a microwave oscillator, and more particularly to a coaxial waveguide with an insertion portion.

  A conventional discharge lamp is shown in FIG. In FIG. 8, reference numeral 1 denotes a discharge lamp, in which a luminescent material composed of a xenon gas and a small amount of an additive is enclosed in an ellipsoidal discharge vessel 2, and the major axis of the discharge vessel 2 is placed in the discharge vessel 2. A pair of rod-shaped members 3 and 4 are provided at predetermined intervals so as to extend in the major axis direction. Each rod-shaped member 3, 4 is formed of an insulator such as quartz or alumina, and the tip is projected into the discharge vessel 2 and the other end is projected outside the discharge vessel 2.

  Each rod-shaped member 3, 4 is embedded with a metal rod-shaped antenna member 5, 6 having a sharp tip, and the base end portion of the rod-shaped antenna member 5, 6 protrudes from the rod-shaped member 3, 4 to the outside. Has been. Each of the rod-shaped antenna members 5 and 6 holds a predetermined gap G3 in the discharge vessel 2 and forms a high impedance of the antenna.

  A launcher 7 is connected to one rod-like member 3. The launcher 7 includes a conductive metal inner cylindrical member 8 and an outer cylindrical member 9 that are coaxially fitted with a predetermined gap therebetween. The launcher 7 is connected to the inner cylindrical member 8 on one end (tip) side of the launcher 7. One rod-like member 3 is fitted, and the other end of the launcher 7 is connected to the solid state oscillator 11 via the coaxial cable 10.

  Thereby, the electromagnetic wave oscillated by the solid state oscillator 11 is guided to the launcher 7 through the coaxial cable 10, and is guided to the rod-shaped antenna members 5 and 6 through the coaxial waveguide of the launcher 7. And strong electromagnetic waves are radiated | emitted from the front-end | tip part of this rod-shaped antenna member 5 and 6, and the luminescent substance in the discharge vessel 2 will light-emit.

In the prior art, the launcher (coaxial waveguide) 7 is formed by integrally assembling the outer conductor and the inner conductor. Therefore, it takes time and skill to attach to and remove from the solid state oscillator 11 and the discharge lamp 1. Was necessary.
JP 2007-115534 A

An object of the present invention is to obtain a coaxial waveguide with an insertion portion that can be easily attached to and detached from a solid-state microwave oscillator, a discharge lamp, or the like.

The invention according to claim 1 includes an outer conductor 26 formed in a cylindrical shape having an outer insertion portion 26a at one end , an annular engagement groove at an intermediate portion, and a holding portion at the other end . An internal insertion portion is provided at one end, an inner conductor 30 having a cylindrical fitting portion at the other end and formed in a pin shape is provided, and an output connector provided at the tip of the coaxial cable of the microwave oscillator 15 is provided. An outer insertion portion 26a of the outer conductor is connected to the outer cylinder 17a, and the inner insertion portion 30a of the inner conductor is detachably fitted to the core body 18a of the output connector so that the inner conductor becomes an outer conductor. together they are arranged with a predetermined gap in the axial portion of the one in which the characteristic impedance when both are disposed with a configuration to correspond to the characteristic impedance of said microwave oscillator.
In the invention according to claim 2, the connector 27 is loosely fitted to the outer peripheral portion of the outer conductor, and the other end portion of the connector is rotatably engaged with the engaging groove 26b of the outer conductor .
The invention according to claim 3 is such that the discharge lamp 35 is connected to a cylindrical fitting portion 30 b formed at the other end of the internal conductor 30 .

According to the first aspect of the present invention, the outer insertion portion 26a and the inner insertion portion 30a are inserted into and removed from the insertion port of each device such as a microwave oscillator, a discharge tube, a coaxial cable, etc. Can be easily attached and removed. Further, by fitting and welding a device such as the antenna member 37 of the discharge tube 35 to the fitting portion of the inner conductor 30, the device can be attached to the coaxial waveguide 25 with the insertion portion with high accuracy. In addition, a device such as the discharge lamp reflector 40 can be attached to the holding portion of the outer conductor 26 with high accuracy. Further, since the characteristic impedance of the coaxial waveguide is made to correspond to the characteristic impedance of the microwave oscillator, a special auxiliary device for matching the characteristic impedance of the coaxial waveguide is required, the device is small and Be simple.
According to the second aspect of the present invention, the coaxial waveguide 25 with an insertion portion can be firmly connected to a device such as a microwave oscillator by the connector 27.
In the invention according to claim 3, when the inner conductor 30 is arranged with a predetermined gap in the axial center portion of the outer conductor 26, the discharge lamp 35 is easily and accurately positioned with respect to the coaxial waveguide 25. Will be.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, FIG. 1 is an exploded cross-sectional view showing the manner in which a coaxial waveguide with an insertion portion according to the present invention is attached to a microwave oscillator, and FIG. 2 is an attachment of the coaxial waveguide with an insertion portion to the microwave oscillator. 3 is a partial cross-sectional view of the state where the internal conductor is attached to the discharge lamp, FIG. 4 is a cross-sectional view of the state where the discharge lamp is attached to the microwave oscillator, and FIG. 5 is a state where the concave reflector is attached. FIG. 6 is a sectional view showing a state in which an ellipsoidal reflector is attached, and FIG. 7 is an exploded sectional view showing a manner of attaching a coaxial waveguide with an insertion portion to a coaxial cable.

  1 to 4, 15 is a solid-state microwave oscillator, and in this example, a microwave of 2.45 GHz is oscillated. An output connector 16 is attached to one side of the case 15a of the solid-state microwave oscillator. The output connector 16 includes a conductive outer cylinder 17 and a linear core body 18 which are coaxially fitted via an insulator 19, and the outer cylinder 17 and the cylindrical body 18 are cylindrical at each outer end. Female insertion ports 17a and 18a are formed coaxially while maintaining a gap.

  The connecting tube 20 is fixed to the outer peripheral portion of the outer end of the outer cylinder 17, screws 20 a and 20 b are formed at both ends of the connecting tube 20, and a connecting nut 21 is screwed to the base-side male screw 20 a. The connecting nut 21 is engaged with a boss 15b formed on the case 15a of the solid-state microwave oscillator to fix the output connector 16 to the case 15a.

  The output connector 16 is detachably connected to a coaxial waveguide with an insertion portion (hereinafter simply referred to as a coaxial waveguide) 25 which is a feature of the present invention. The coaxial waveguide 25 is fitted to the axial center portion of the cylindrical outer conductor 26 so that the inner conductor 30 can be inserted and removed with a predetermined gap in the radial direction. The characteristic impedance of the wave tube 25 is set to be equal to the characteristic impedance of the solid-state microwave oscillator 15, and is set to 50Ω in this example. The outer conductor 26 and the inner conductor 30 are formed of a conductive material such as copper.

As shown in FIG. 1, the outer conductor 26 is formed in a stepped cylindrical shape having a large diameter stepwise from the left portion toward the right portion (tip portion), and a small-diameter insertion tube ( external difference) at the left end portion. ) 26a, an annular engaging groove 26b at the right and left intermediate portion, a large-diameter holding portion 26c at the right end, and a connecting tool 27 loosely fitted on the outer periphery on the left side. The right end of the tool 27 is rotatably engaged with the engagement groove 26b. The connector 27 forms a female screw 27a on the inner periphery of the left portion, and the female screw 27a is detachably screwed into the male screw 20b of the right end portion of the connecting pipe 20 described above.

  As shown in FIG. 1, the inner conductor 30 is formed in a pin shape, a small-diameter insertion pin (inner insertion portion) 30a is formed at the left end portion, and a cylindrical shape divided in the circumferential direction at the right end portion. A fitting portion (socket) 30b is formed. The insertion pin 30a is removably inserted into the female insertion port 18a of the core 18 of the output connector 16 described above. In addition, the fitting portion (socket) 30b is formed in a cylindrical shape divided in the circumferential direction, and a first antenna member 37 of a discharge lamp 35 described later is inserted into the fitting portion 30b in a detachable manner.

  In FIG. 3, reference numeral 35 denotes a discharge lamp connected to the coaxial waveguide 25. The discharge lamp 35 is formed at both ends of the long axis side of a discharge vessel 36 formed into a hollow sphere with a translucent material, in this example, quartz glass. A first antenna member 37 and a second antenna member 38 are attached, and a light emitting material is enclosed in the discharge vessel 36. The luminescent material is made of xenon, mercury, sulfur and argon, or these and a small amount of additives.

  The first and second antenna members 37 and 38 are made of a conductive material, for example, a heat-resistant material such as tungsten or molybdenum, or a pin or band plate made of platinum, gold or the like having corrosion resistance against discharge gas. The tip portions 37a and 38a are projected from both ends of the long axis side of the discharge vessel 36 into the discharge vessel 36, and the outer ends are embedded in the holding bodies 39a and 39b. The holding bodies 39a and 39b are made of a part of the material forming the discharge vessel 36. The tip portions 37a and 38a are opposed to each other at the central portion in the discharge vessel 36, and the gap between them, that is, the gap G1, is set to a value suitable for discharge, in this example, 2 mm to 3 mm. The tip portions 37a, 38a of the first and second antenna members 37, 38 may be surrounded by the same material as the holding bodies 39a, 39b.

Then, the inner conductor 30 is attached to the discharge lamp 35. That is, as shown in FIG. 3, the fitting portion (socket) 30b of the inner conductor 30 is fitted to one holding body, in this example, the end of the holding body 39a in which the first antenna member 37 is embedded, It is fixed integrally with an adhesive. On the other hand, the outer conductor 26 is fixed to the outer cylinder 17 of the output connector 16. That is, the outer insertion portion 26a of the outer conductor 26 is inserted into the insertion port 17a for forming the outer cylinder 17 of the output connector 16, and the connector 27 is screwed into the male screw 20b of the connecting tube 20 to connect the outer conductor 26 to the output connector. It is fixed to 16 outer cylinders 17.

  Next, as shown in FIG. 4, the insertion pin 30a of the inner conductor 30 is inserted into the insertion port 18a for forming the core 18 of the output connector 16, and the discharge lamp 35 is connected to the output connector 16 and the inner conductor. 30 is coaxially fitted in the outer conductor 26, and the inner conductor 30 and the outer conductor 26 constitute a coaxial waveguide 25.

In FIG. 5, reference numeral 40 denotes a concave reflector surrounding the discharge lamp 35. The concave reflector 40 is formed in a semi-elliptical shape divided by a central portion in the major axis direction by an aluminum material, and the inner surface is finished to a mirror surface to smoothly reflect electromagnetic waves. It is a reflective surface 40a. A boss 41 is formed at the center of the long-axis side wall of the concave reflector 40, and the boss 41 is fitted into the holding portion 26 c of the coaxial waveguide 25 described above and fixed by a bolt 42. The first antenna member 37 of the discharge lamp 35 accommodated in the concave reflector 40 is inserted into the central portion of the boss 41, and the internal conductor 30 connected to the first antenna member 37 is connected to the core body 18 . Then, the radiated light portions (light sources) of the first and second antenna members 37 and 38 of the discharge lamp 35 are positioned at the focal point F1 of the concave reflector 40.

According to the embodiment, the electromagnetic wave oscillated from the solid-state microwave oscillator 15 is guided to the first and second antenna members 37 and 38 through the coaxial waveguide (launcher). Two strong electromagnetic waves are radiated from the tip portions 37a and 38a of the two antenna members 37 and 38 to generate plasma, and the luminescent material in the discharge vessel 36 emits light.

  The light from the discharge lamp 35 is reflected from the focal point F1 by the reflecting surface 40a of the concave reflector 40 and is efficiently emitted toward the outside.

In FIG. 6, reference numeral 45 denotes an ellipsoidal reflector. The ellipsoidal reflector 45 has aluminum ellipsoidal reflectors 46a and 46b facing each other in the major axis direction (left and right) center portion, and an ellipsoidal reflecting surface inside. 46c is formed, and bosses 47 and 48 are formed at the center of each wall on the long axis side.

  The discharge lamp 35 is accommodated in the ellipsoidal reflector 45 from the center of one (left) boss 47 and fixed to the boss 47 via the left holding body 39a. A light emitter 50 made of an optical cable material is fitted and fixed to the center of the other (right) boss 48, and one end (left end) of the light emitter 50 protrudes into the elliptical reflector 45.

  The light source of the discharge lamp 35, that is, the radiated light of the first and second antenna members 37 and 38 is located at one focal point F1 of the elliptical reflector 45, and the protruding end of the light emitter 50 is an elliptical surface. It is located at the other focal point F2 portion of the reflector 45. The ellipsoidal reflector 45 is supported by the output connector 16 of the solid-state micro-oscillator 15 through the holding portion 26c by fitting the boss 47 to the holding portion 26c of the coaxial waveguide 25 and fixing it with the bolt 51.

According to FIG. 6, the light L1 emitted from the light source of the discharge lamp 35 is reflected by the ellipsoidal reflecting surface 46c, gathers at the other focal point F2, and is emitted to the outside through the light emitter 50. The electromagnetic wave M1 that has not been converted to light is returned from the other focal point (F2) side to the one focal point F1 and converted into light by the first and second antenna members 37 and 38. For this reason, the light conversion efficiency of electromagnetic waves is increased, and the light generated in the ellipsoidal reflector 45 is efficiently emitted to the outside by the light emitter 50.

  7, the base end portion (left end portion) of the coaxial waveguide 25 is connected to the female side connection portion 55 a of the coaxial cable 55, and the male side connection portion of the coaxial cable 55 is connected to the output connector 16 of the solid-state micro-oscillator 15. It is a thing.

Thus, the coaxial waveguide 25 through the coaxial cable 55 can be easily connected to the solid-state microwave oscillator 15, facilitates the coaxial waveguide 25 at a position distant from the solid microwave oscillator 15 Can be attached to.

FIG. 1 is an exploded cross-sectional view showing a mode of attaching a coaxial waveguide with an insertion portion to a microwave oscillator according to the present invention. FIG. 2 is a cross-sectional view of a state where the coaxial waveguide with an insertion portion is attached to a microwave oscillator. It is a fragmentary sectional view in the state where the inner conductor was attached to the discharge lamp. It is sectional drawing of the state which attached the discharge lamp to the microwave oscillator. It is sectional drawing of the state which attached the concave reflector. It is sectional drawing of the state which attached the ellipsoidal reflector. It is sectional drawing which decomposed | disassembled which shows the attachment aspect to the coaxial cable of the coaxial waveguide with an insertion part. It is sectional drawing which shows the coaxial waveguide with an insertion part of the conventional discharge lamp.

15 Solid Microwave Oscillator 16 Output Connector 17 Outer Tube 17a Female Insertion Port 18 Core 18a Female Insertion Port 19 Insulator 20 Connection Tube 20a, 20b Male Thread 21 Connector 25 Coaxial Waveguide with Insert Port (Luncher)
26 Outer conductor 26a Insertion tube ( outer insertion part)
26b Engaging groove 26c Holding part 27 Connecting tool 27a Female thread 30 Internal conductor 30a Inner insertion part 30b Fitting part 35 Discharge lamp 36 Discharge vessel 37 First antenna member 38 Second antenna member 37a, 38a Tip part 39a, 39b Holding Body 40 Concave reflector 40a Reflective surface 41 Boss 42 Bolt 45 Ellipsoidal reflector 46a, 46b Concave reflector 46c Elliptical reflector 47, 48 Boss 50 Light emitter 51 Bolt 55 Coaxial cable 55a Female side connection 55b Male side connection

Claims (3)

An outer conductor (26) formed integrally with an outer insertion portion (26a) at one end , an annular engagement groove (26b) at the middle, and a holding portion (26c) at the other end. An internal insertion portion (30a) at one end, and an internal conductor (30) formed in a pin shape having a cylindrical fitting portion (30b) at the other end , and a microwave oscillator (15 The outer insertion portion (26a) of the outer conductor (26) is connected to the outer tube (17) of the output connector provided at the end of the coaxial cable of the outer connector), and the inner conductor (18) is connected to the core (18) of the output connector. 30) the inner insertion portion (30a) is detachably fitted so that the inner conductor (30) is arranged with a predetermined gap in the axial center portion of the outer conductor (26). characteristic impedance of but having said characteristic impedance when placed microwave oscillator (15) Insertion portion with the coaxial waveguide of the discharge lamp, characterized in that to correspond to. The coupling tool (27) is loosely fitted to the outer periphery of the outer conductor (26), and the other end of the coupling tool (27) is rotatably engaged with the engagement groove (26b) of the outer conductor (26). The coaxial waveguide with an insertion portion according to claim 1. The coaxial waveguide with an insertion portion according to claim 1 or 2 , wherein a discharge lamp (35) is connected to a cylindrical fitting portion (30b) formed at the other end of the inner conductor (30). .

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