CN110148551B - Low-cost microwave plasma light source resonator - Google Patents
Low-cost microwave plasma light source resonator Download PDFInfo
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- CN110148551B CN110148551B CN201910347683.0A CN201910347683A CN110148551B CN 110148551 B CN110148551 B CN 110148551B CN 201910347683 A CN201910347683 A CN 201910347683A CN 110148551 B CN110148551 B CN 110148551B
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- ceramic
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- ceramic resonator
- metal belt
- metallization
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- 239000000919 ceramic Substances 0.000 claims abstract description 83
- 229910052751 metal Inorganic materials 0.000 claims abstract description 50
- 239000002184 metal Substances 0.000 claims abstract description 50
- 230000008878 coupling Effects 0.000 claims abstract description 36
- 238000010168 coupling process Methods 0.000 claims abstract description 36
- 238000005859 coupling reaction Methods 0.000 claims abstract description 36
- 238000001465 metallisation Methods 0.000 claims abstract description 27
- 239000000523 sample Substances 0.000 claims abstract description 17
- 239000004020 conductor Substances 0.000 claims abstract description 6
- 229910052573 porcelain Inorganic materials 0.000 claims description 4
- 238000005245 sintering Methods 0.000 abstract description 10
- 238000004880 explosion Methods 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 239000011797 cavity material Substances 0.000 description 17
- 230000005684 electric field Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 9
- 239000011324 bead Substances 0.000 description 8
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 7
- 229910052709 silver Inorganic materials 0.000 description 7
- 239000004332 silver Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- PCEXQRKSUSSDFT-UHFFFAOYSA-N [Mn].[Mo] Chemical compound [Mn].[Mo] PCEXQRKSUSSDFT-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- -1 polytetrafluoroethylene ring Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
- H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
Abstract
The invention discloses a low-cost microwave plasma light source resonator, wherein a coupling probe is connected with an inner conductor of an input coaxial line and is inserted into an air coupling cavity, the top surface, the bottom surface, the front side surface and the rear side surface of the ceramic resonator are all subjected to metallization and are grounded, an upper metal belt and a lower metal belt are arranged on the right side surface of the ceramic resonator, the upper end of the upper metal belt is connected with the metal surface of the top surface of the ceramic resonator and is grounded, the lower end of the lower metal belt is connected with the metal surface of the bottom surface of the ceramic resonator and is grounded, a semi-cylindrical groove is formed in the left side surface of the ceramic resonator, an upper section of metallization part and a lower section of metallization part which are not connected are arranged in the groove, and deep through holes are respectively formed between the upper metal belt and the upper metallization part and the lower metal belt and the lower metallization part. The invention reduces the explosion phenomenon of ceramic blocks during sintering, has the advantages of difficult deformation of the size after sintering, high precision, improvement of the yield of products and substantial reduction of the cost.
Description
Technical Field
The invention relates to the technical field of crossing of a high-efficiency plasma light source and a microwave technology, in particular to a low-cost microwave plasma light source resonator.
Background
Compared with the existing high-intensity gas discharge light source, the microwave plasma light source has no metal electrode in the arc tube, avoids the risk of easy air leakage caused by sealing the metal electrode and glass, and avoids the pollution of luminous elements caused by the evaporation of the electrode in the vacuum arc tube when the bulb works at high temperature, thereby reducing the luminous flux reduction caused by light attenuation and prolonging the service life of the light source. In addition, the plasma light source allows the lamp beads to work in a high-temperature state, is favorable for the discharge spectrum broadening of the luminous element, can emit full-spectrum point light sources from ultraviolet rays to infrared rays, and is an excellent light source really similar to solar spectrum. The plasma light source has the advantages of no electrode, long service life, high light efficiency, energy conservation, environmental protection and the like, and has wide application prospect.
The microwave source driven plasma light-emitting device mainly comprises four parts, including a direct-current power supply, a radio frequency/microwave driving power source, a microwave resonator and a bulb. The energy forms stronger electric field intensity at the bulb on the surface of the microwave resonator to excite the gas in the bulb to discharge, thus forming a high-brightness light source. Currently, existing plasma light source technology generally adopts ceramic resonators and metal coaxial cavity resonators. The ceramic resonator has mature technology and the most widely applied technology, can emit luminous flux of over 20000 lumens under the microwave power of 200W, and has the highest full spectrum luminous efficiency of 150lm/W. But the higher cost limits the further popularization of the plasma light source in the market, and especially the ceramic resonator adopted in the prior art has the problems of difficult sintering process, easy ceramic block cracking, size deformation and the like in the sintering process due to larger thickness and volume, low yield and influence on production efficiency and productivity. In addition, the prior art needs to implement large-area metallization on the ceramic surface by adopting a silver burning process, thereby forming the microwave resonator. Silver is a noble metal, and the silver paste and silver firing process used in large quantities also cause cost increase. In conclusion, due to the technical problems of ceramic sintering, metallization and the like, the cost of the ceramic resonator is high, the price is high, and the market popularization is seriously influenced.
To reduce costs, various techniques are employed from the manufacturing process to increase the yield of ceramic sintering, such as the punch-on-ceramic technique disclosed in the CN 204792692U patent, or to change the shape of the ceramic block. However, the technical difficulties caused by the excessive volume and thickness of the resonator are not solved, and the use of silver paste is not reduced, so that the problems of high cost and price cannot be fundamentally solved. In addition, in design, once the structure of the resonator is changed, no matter the size, the material and the like are slightly changed, the resonant frequency of the plasma light source resonator is changed, and the light cannot be emitted or the light efficiency is reduced. Therefore, there is no change in resonator structure in LEP light sources in the industry market in the prior art due to possible risks.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a low-cost microwave plasma light source resonator.
The invention is realized by the following technical scheme:
the utility model provides a low-cost microwave plasma light source resonator, includes input coaxial line, coupling probe, air coupling chamber and ceramic resonator, the coupling probe be long and thin metal stick, coupling probe and input coaxial line's inner conductor be connected and insert in the air coupling chamber, ceramic resonator be rectangular cuboid porcelain piece, ceramic resonator's top surface, bottom surface, leading flank and trailing flank all adopt metallization and ground connection, be provided with upper and lower side strap on ceramic resonator's right flank, upper end and the metal face of ceramic resonator top surface are connected and ground connection of upper side strap, the lower extreme and the metal face of ceramic resonator bottom surface are connected and ground connection of downside strap, open half-cylindrical slot in ceramic resonator's left surface, be equipped with upper and lower two sections non-connected metallization between upper side strap and upper side metallization portion, open respectively between downside metallization portion and the downside metallization portion, all do conductive metallization at the inner wall of two deep vias, ceramic resonator's right side and air resonator's left side face and fixed connection of coupling.
The widths of the upper metal belt and the lower metal belt are smaller than 60% of the width of the right side surface of the ceramic resonator.
An insulating medium ring is sleeved at an input port of the inner wall of the air coupling cavity, into which the coupling probe is inserted, so as to improve the withstand voltage of an electric field.
The working principle is as follows: microwave energy is input through a coaxial line, an inner conductor of the coaxial line is connected with a coupling probe, a metal probe is inserted into an air coupling cavity, electric field distribution is formed in the coupling cavity, two metal strips on the right side face of a ceramic resonator are coupled with the electric field in the air cavity to generate current, then radio frequency energy in the ceramic resonator generates resonance, the resonance is transmitted between two metalized areas in a groove on the left side face of a ceramic block through two deep through holes, a strong electric field is generated between the two metalized areas, gas in a lamp bead is broken down, and the energy is sent into the lamp bead to excite to generate glow and arc discharge, so that a high-brightness light source is generated.
An insulating medium ring is sleeved at the input end of the inner wall of the coupling probe inserted into the air cavity so as to improve the withstand voltage of an electric field. Compared with the ceramic block coupling in the prior art, the air coupling cavity adopted by the invention has the advantages that the air dielectric loss is far lower than that of the ceramic, so that the dielectric loss is reduced, the use of ceramic materials is reduced, and the cost is reduced. However, the air coupling is problematic in that the withstand voltage is lowered and the transmission of microwaves is affected at the time of high power transmission. To solve this problem, an insulating dielectric ring is placed at the input port where the probe is inserted into the coupling cavity and is sleeved on the inner conductor, because the electric field concentration is easily formed at this input port to generate breakdown. The medium ring can be directly made of polytetrafluoroethylene ring integrated with the input coaxial line, or ceramic ring can be added separately.
The invention is characterized in that the thickness and the volume of the ceramic are greatly reduced by adopting the strip-shaped cuboid ceramic blocks, and compared with the prior art, the thickness is reduced by about two thirds. However, the problem with the reduced thickness is that, since the ceramic resonator operates in the microwave frequency range, any minor changes in structure and dimensions, whether the ceramic block thickness, length, coupling cavity material, or shape and dimensions of the metallization in the trench, will result in a change in the resonant frequency of the resonator, which will directly result in the plasma light source not being lit or degrading the light efficiency, the parameters of the resonator must be redesigned to meet the LEP operating frequency requirements, which is accomplished with knowledge in the microwave field, and conventional knowledge in the light source field is generally not involved. The invention optimizes and adjusts the length and thickness of the rectangular ceramic resonator porcelain block, the shape and area of the metallized area in the top plane groove, and particularly needs to calculate the width and pitch of the bottom metal belt to meet the consistency of the frequency and the common frequency band of the resonator, and simultaneously, the invention not only needs to avoid the electric field breakdown of the metal belt and the probe in the air cavity, but also meets the enough current bearing capacity and the good coupling capacity with the plasma.
In the cuboid ceramic block, two partial areas in the semi-cylindrical groove, two inner walls of the through holes, four side surfaces around the ceramic block and two rectangular metal strips on the right side surface are subjected to metallization treatment, and the two deep inner wall metal strips of the through holes are respectively connected with the two metal strips on the right side surface so as to form the resonant cavity. The metallization method can be realized by adopting the technologies of sintering molybdenum manganese, silver firing, or copper electroplating. Because of the reduced thickness of the ceramic block, the width of the metal strip is required to be smaller than the width of the bottom surface of the ceramic resonator in order to avoid sparking between the metal strip and the side ground layers, and the width is required to be reduced compared with the prior art, and the width of the metal strip is generally between 25% and 60% of the width of the right side surface of the ceramic in order to meet the current bearing capability. Meanwhile, in order to avoid breakdown of two parts of metalized areas in the groove between the left side surface and the ground, the plane of the left side surface of the ceramic is not metalized, and a sufficient gap is kept between the two metalized areas in the groove.
The frequency band in which the ceramic resonator operates stably is required to be within the range of radio transmission permission, wherein it is preferable to be between 430MHz and 440 MHz.
In actual use, the fully-closed quartz glass lamp beads or ceramic bulb lamp beads are placed in the semi-cylindrical grooves of the cuboid ceramic blocks and are positioned between two parts of metalized areas in the grooves.
The invention has the advantages that: the thickness and the volume of the ceramic resonator for the plasma light source LEP are reduced, only one ceramic block is adopted at the same time, and air medium is utilized to replace part of ceramic, so that the consumption of ceramic powder raw materials is reduced by 83% when the resonator is sintered, and the consumption of silver paste on the peripheral surface is reduced by about 70% when the resonator is sintered; moreover, on the premise of not influencing the performance of the plasma light source, the explosion phenomenon during sintering of the ceramic block is reduced due to the reduction of the volume and the thickness, the size after sintering is not easy to deform, the precision is high, and the yield of products is improved, so that the cost of the ceramic resonator can be greatly reduced.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention.
Fig. 2 is a graph of calculated return loss for one embodiment of the present invention.
FIG. 3 is a graph showing the calculated electric field distribution according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, a low-cost microwave plasma light source resonator comprises an input coaxial line 1, a coupling probe 2, an air coupling cavity 3 and a ceramic resonator 4, wherein the coupling probe 2 is an elongated metal rod, the coupling probe 2 is connected with an inner conductor of the input coaxial line 1 and is inserted into the air coupling cavity 3, the ceramic resonator 4 is a rectangular cuboid porcelain block, the top surface, the bottom surface, the front side surface and the rear side surface of the ceramic resonator 4 are all subjected to metallization and grounding, an upper metal strap 5 and a lower metal strap 5 are arranged on the right side surface of the ceramic resonator 4, the upper end of the upper metal strap is connected with the metal surface of the top surface of the ceramic resonator 4 and is grounded, the lower end of the lower metal strap is connected with the metal surface of the bottom surface of the ceramic resonator 4, a semi-cylindrical groove 6 is arranged on the left side surface of the ceramic resonator 4, two sections of non-connected metallization processing parts 7 are arranged in the groove 6, deep through holes 8 are respectively formed between the upper metal strap and the upper metallization processing part and the lower metallization processing part, and the lower metallization processing part are respectively provided with deep through holes 8, and the inner walls of the two metal straps are connected with the left side surface of the ceramic resonator 4 in a deep contact mode, and the left side surface of the ceramic resonator is fixedly connected with the left side surface.
The widths of the upper metal belt 5 and the lower metal belt 5 are smaller than 60% of the width of the right side surface of the ceramic resonator 4.
An insulating medium ring 9 is sleeved at the input port of the inner wall of the air coupling cavity inserted into the coupling probe 2 so as to improve the withstand voltage of an electric field.
The above-mentioned is the internal main body structure of the invention, in actual use, the air coupling cavity 3 and the ceramic resonator 4 are surrounded by metal shells on the upper, lower, front and rear sides and the right side, and aluminum or aluminum alloy materials are commonly used in actual use, and the air cavity is directly formed in the aluminum shell by using the mounting position of the ceramic resonator, so that the ceramic block coupling in the prior art is avoided, and the material cost and ceramic parts are reduced.
In actual use, the fully-closed quartz glass lamp beads or ceramic bulb lamp beads are placed in the semi-cylindrical grooves of the cuboid ceramic blocks and are positioned between the two parts of metalized areas 7 in the grooves.
The rectangular ceramic block 4 is perforated, so that an exhaust channel of the ceramic block can be further increased, the phenomenon of paraffin explosion during ceramic sintering is avoided, and the yield is further improved.
Due to the existence of the bottom air cavity, in order to fix the position of the ceramic resonator in the metal shell, a plurality of blind holes 10 can be designed on the side surface of the ceramic block, and the ceramic resonator can be firmly fixed by fixing the ceramic block through screws and penetrating the metal shell to insert the blind holes.
Fig. 2 shows the result of calculating the return loss of one embodiment of the low-cost microwave plasma light source resonator according to the present invention, and shows that the resonant frequency is 453MHz, which is consistent with the frequency band of the prior art, and the feasibility of the present invention is proved. After the lamp beads are excited by the resonator to work in a complete rated state, the frequency is in a normal range, and the electric field distribution diagram calculated by the resonator is shown in fig. 3.
The method has the advantages that the processing is finished in one embodiment, and the microwave test and the plasma light source experiment prove that the test result is consistent with the theoretical calculation, so that the feasibility and the effect of the method are proved.
Claims (1)
1. A microwave plasma light source resonator, characterized by: the device comprises an input coaxial line, a coupling probe, an air coupling cavity and a ceramic resonator, wherein the coupling probe is connected with an inner conductor of the input coaxial line and is inserted into the air coupling cavity, the ceramic resonator is a strip-shaped cuboid porcelain block, the top surface, the bottom surface, the front side and the rear side of the ceramic resonator are all subjected to metallization and grounding, an upper metal belt and a lower metal belt are arranged on the right side surface of the ceramic resonator, the upper end of the upper metal belt is connected with the metal surface of the top surface of the ceramic resonator and grounded, the lower end of the lower metal belt is connected with the metal surface of the bottom surface of the ceramic resonator and grounded, a semi-cylindrical groove is formed in the left side surface of the ceramic resonator, an upper metallization part and a lower metallization part which are not connected are arranged in the groove, deep through holes are respectively formed between the upper metal belt and the upper metallization part, and between the lower metal belt and the lower metallization part, conductive metallization is carried out on the inner walls of the two deep through holes, and the right side surface of the ceramic resonator is in contact with and fixedly connected with the left side surface of the air coupling cavity;
the widths of the upper metal belt and the lower metal belt are smaller than 60% of the width of the right side surface of the ceramic resonator;
an insulating medium ring is sleeved at an input port of the inner wall of the coupling probe inserted into the air coupling cavity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910347683.0A CN110148551B (en) | 2019-04-28 | 2019-04-28 | Low-cost microwave plasma light source resonator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910347683.0A CN110148551B (en) | 2019-04-28 | 2019-04-28 | Low-cost microwave plasma light source resonator |
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| CN110148551A CN110148551A (en) | 2019-08-20 |
| CN110148551B true CN110148551B (en) | 2024-02-02 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002280191A (en) * | 2001-03-19 | 2002-09-27 | Victor Co Of Japan Ltd | Resonator device for electrodeless discharge lamp |
| CN102439690A (en) * | 2009-05-08 | 2012-05-02 | 塞拉维申有限公司 | Light source powered by microwaves |
| CN204067303U (en) * | 2014-06-12 | 2014-12-31 | 单家芳 | For the microwave cavity of plasma source |
| CN204792692U (en) * | 2015-05-05 | 2015-11-18 | 单家芳 | But microwave plasma light source syntonizer of volume production |
| CN204927239U (en) * | 2015-06-17 | 2015-12-30 | 单家芳 | Microwave plasma light source |
| US9761433B1 (en) * | 2016-09-20 | 2017-09-12 | Spl Industries Usa, Inc. | Compact air-cavity electrodeless high intensity discharge lamp with coupling sleeve |
| CN209859912U (en) * | 2019-04-28 | 2019-12-27 | 中国科学院合肥物质科学研究院 | Low-cost microwave plasma light source resonator |
-
2019
- 2019-04-28 CN CN201910347683.0A patent/CN110148551B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002280191A (en) * | 2001-03-19 | 2002-09-27 | Victor Co Of Japan Ltd | Resonator device for electrodeless discharge lamp |
| CN102439690A (en) * | 2009-05-08 | 2012-05-02 | 塞拉维申有限公司 | Light source powered by microwaves |
| CN204067303U (en) * | 2014-06-12 | 2014-12-31 | 单家芳 | For the microwave cavity of plasma source |
| CN204792692U (en) * | 2015-05-05 | 2015-11-18 | 单家芳 | But microwave plasma light source syntonizer of volume production |
| CN204927239U (en) * | 2015-06-17 | 2015-12-30 | 单家芳 | Microwave plasma light source |
| US9761433B1 (en) * | 2016-09-20 | 2017-09-12 | Spl Industries Usa, Inc. | Compact air-cavity electrodeless high intensity discharge lamp with coupling sleeve |
| CN209859912U (en) * | 2019-04-28 | 2019-12-27 | 中国科学院合肥物质科学研究院 | Low-cost microwave plasma light source resonator |
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