CN109546458B - Impedance matched back board connector - Google Patents
Impedance matched back board connector Download PDFInfo
- Publication number
- CN109546458B CN109546458B CN201910049562.8A CN201910049562A CN109546458B CN 109546458 B CN109546458 B CN 109546458B CN 201910049562 A CN201910049562 A CN 201910049562A CN 109546458 B CN109546458 B CN 109546458B
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- module
- differential wiring
- odd
- cavity
- wiring cavity
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- 238000010586 diagram Methods 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 238000009434 installation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000012212 insulator Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/646—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00 specially adapted for high-frequency, e.g. structures providing an impedance match or phase match
- H01R13/6473—Impedance matching
- H01R13/6477—Impedance matching by variation of dielectric properties
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/46—Bases; Cases
- H01R13/502—Bases; Cases composed of different pieces
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/46—Bases; Cases
- H01R13/516—Means for holding or embracing insulating body, e.g. casing, hoods
- H01R13/518—Means for holding or embracing insulating body, e.g. casing, hoods for holding or embracing several coupling parts, e.g. frames
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/646—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00 specially adapted for high-frequency, e.g. structures providing an impedance match or phase match
- H01R13/6461—Means for preventing cross-talk
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R2201/00—Connectors or connections adapted for particular applications
- H01R2201/06—Connectors or connections adapted for particular applications for computer periphery
Abstract
The application discloses an impedance matching backboard connector, which comprises a male end base, a female end base and an odd-even module, wherein the female end base is inserted on the male end base, the odd-even module is installed in the female end base, a plurality of odd-even module differential wiring cavities for arranging a second wiring group are formed on the odd-even module, a plurality of even-even module differential wiring cavities for arranging a first wiring group are formed on the even-even module, the odd-even module differential wiring cavities and the even-even module differential wiring cavities are distributed in a staggered manner, a first bump is arranged on the even-even module opposite to the odd-even module differential wiring cavities, the first bump is positioned in the odd-even module differential wiring cavities, a second bump is arranged on the odd-even module opposite to the even-even module differential wiring cavities, and the second bump is positioned in the even-even module differential wiring cavities. The application can be used for adjusting impedance by changing the dielectric constant so as to realize impedance matching.
Description
Technical Field
The present application relates to electrical connectors, and in particular to impedance-matched backplane connectors.
Background
Besides meeting the general performance requirements, the electric connector is required to meet the requirements of good contact, reliable work and convenient maintenance.
The high-speed backboard connector is used for large-scale communication equipment, ultra-high performance servers, supercomputers, industrial computers, high-end storage equipment and the like, and the market scale of the high-speed connector is rapidly grown along with the rapid development of the communication, electronic and internet industries.
In the high-speed backplane connector, impedance needs to be matched to achieve the purpose that signals are transmitted to a load point as much as possible, so that signal crosstalk is reduced, and signal integrity is improved.
Disclosure of Invention
The application aims to overcome the defects of the prior art and provide an impedance matching backboard connector.
The aim of the application is achieved by the following technical scheme: the back board connector comprises a male end base, a female end base and an odd-even module, wherein the female end base is inserted on the male end base, the odd-even module is installed in the female end base and comprises an odd module and an even module which are mutually clung, the odd module is provided with a plurality of odd module differential wiring cavities for arranging a second wiring group, the even module is provided with a plurality of even module differential wiring cavities for arranging a first wiring group, the odd module differential wiring cavities and the even module differential wiring cavities are distributed in a staggered manner, a first bump is arranged on the even module opposite to the odd module differential wiring cavities, the first bump is matched in the odd module differential wiring cavities, the odd module opposite to the even module differential wiring cavities is provided with a second bump, and the second bump is matched in the even module differential wiring cavities.
Preferably, the odd module differential wiring cavities are three, and are sequentially divided into a fourth differential wiring cavity, a fifth differential wiring cavity and a sixth differential wiring cavity from short to long, and second bumps are arranged on odd modules positioned on two sides of the fourth differential wiring cavity, the fifth differential wiring cavity and the sixth differential wiring cavity.
Preferably, the number of the even module differential wiring cavities is three, and the even module differential wiring cavities are sequentially divided into a first differential wiring cavity, a second differential wiring cavity and a third differential wiring cavity from short to long, and first bumps are arranged on the even modules positioned on two sides of the first differential wiring cavity, the second differential wiring cavity and the third differential wiring cavity.
Preferably, at least one connecting part is arranged in the first differential wiring cavity, the second differential wiring cavity, the third differential wiring cavity, the fourth differential wiring cavity, the fifth differential wiring cavity and the sixth differential wiring cavity.
Preferably, a plurality of mounting grooves are formed in the female end base side by side, the odd-even modules are mounted in the mounting grooves, and the groove walls of the mounting grooves extend upwards to form the rib separating walls.
Preferably, the back of the first bump is provided with a first groove, the thickness of the groove wall of the first groove is uniform, the back of the second bump is provided with a second groove, and the thickness of the groove wall of the second groove is uniform.
Preferably, the even module is provided with a first positioning column and a second positioning column which are staggered, the odd module is provided with a first positioning hole corresponding to the first positioning column, and the odd module is provided with a second positioning hole corresponding to the second positioning column.
The application has the following advantages:
1. according to the backboard connector disclosed by the application, the odd-even modules of the backboard connector change transmission media in the area around the wires of the first wire group and the second wire group from air into an insulator with a cavity formed by the odd modules, the first bumps and the even modules and the second bumps through the first bumps and the second bumps, and the dielectric constant of the air is lower than that of plastic, so that the dielectric constant of the transmission media in the wire area is changed, the adjustable impedance is in a required range, and the impedance matching is realized;
2. according to the odd-even module, the first groove is formed in the back face of the first lug, the second groove is formed in the back face of the second lug, the cavity formed by the first groove and the second groove is an air cavity, the dielectric constant of air in the air cavity is lower than that of plastic, and therefore the dielectric constant of a transmission medium is changed, and therefore the air cavity formed by the first groove and the second groove can be used for adjusting impedance, and impedance of the odd-even module is matched;
3. the odd-even module is stably installed, and the vertical direction is not deviated, so that the positive position of the terminal of the product, which is crimped at the PCB end, meets the requirements;
4. the first lug and the second lug are matched in the corresponding wiring cavity, so that the odd module and the even module are convenient to install, the installation stability of the odd module and the even module and the structural strength of the odd module are improved, the odd module is not easy to deform, the material for manufacturing the odd module and the even module is also saved, and the production cost is reduced.
Drawings
FIG. 1 is a schematic diagram of a parity module;
FIG. 2 is a schematic diagram of an exploded view of a parity module;
FIG. 3 is a schematic diagram of the structure of an odd module;
FIG. 4 is a schematic diagram of the structure of an even module;
FIG. 5 is a schematic diagram of a configuration in which a first trace group is mounted to an even module;
FIG. 6 is a schematic diagram of a structure in which the odd module is mounted with a second trace group;
FIG. 7 is a schematic diagram showing the distribution of the first grooves;
FIG. 8 is a schematic diagram showing the distribution of the second grooves;
fig. 9 is a schematic structural view of an electrical connector
Fig. 10 is a schematic diagram of a second structure of the electrical connector
FIG. 11 is a schematic view of a female end base
In the figure: the device comprises a 1-even module, a 2-odd module, a 3-first wiring group, a 4-second wiring group, a 5-first bump, a 6-second bump, a 7-connecting part, an 8-odd module differential wiring cavity, a 9-even module differential wiring cavity, an 11-first differential wiring cavity, a 12-second differential wiring cavity, a 13-third differential wiring cavity, a 21-fourth differential wiring cavity, a 22-fifth differential wiring cavity, a 23-sixth differential wiring cavity, a 31-male end base, a 32-female end base, a 33-odd module, a 35-rib wall, a 36-mounting groove, a 41-first positioning column, a 42-first positioning hole, a 43-second positioning column, a 44-second positioning hole, a 51-first groove and a 61-second groove.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that, the terms "upper," "inner," "outer," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship conventionally put in use of the inventive product, only for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 9 and 10, the impedance-matched back board connector comprises a male end base 31, a female end base 32 and an odd-even module 33, wherein the female end base 32 is inserted into the male end base 31, the odd-even module 33 is arranged in the female end base 32, as shown in fig. 1, 9 and 10, the odd-even module 33 comprises an odd module 2 and an even module 1 which are mutually clung, in this embodiment, as shown in fig. 2, 3 and 4, a first positioning column 41 and a second positioning column 43 which are staggered are arranged on the even module 1, a first positioning hole 42 corresponding to the first positioning column 41 is arranged on the odd module 2, and a second positioning hole 44 corresponding to the second positioning column 43 is arranged on the odd module 2, preferably, the first positioning column 41 is arranged at the upper right corner of the even module 1, the second positioning column 43 is a plurality, and is arranged at the bottom of the even module 1, further, the second positioning hole 44 is a blind hole, the connection between the first positioning column 41 and the first positioning column 42 is in interference fit, and the second positioning column 43 is in good interference fit with the second positioning column 44 and the first positioning column 44 and the second positioning column 44 is in flush fit with the first positioning column 44 and the second positioning column 43.
In this embodiment, as shown in fig. 5 and 6, the odd module 2 is provided with a plurality of odd module differential routing cavities 8 for arranging the second routing group 4, the even module 1 is provided with a plurality of even module differential routing cavities 9 for arranging the first routing group 3, in this embodiment, as shown in fig. 3, the odd module differential routing cavities 8 are three and are sequentially divided into a fourth differential routing cavity 21, a fifth differential routing cavity 22 and a sixth differential routing cavity 23 from short to long, further, the fourth differential routing cavity 21 is located at the inner side of the odd module 2, the sixth differential routing cavity 23 is located at the outer side of the odd module 2, as shown in fig. 4, the even module differential routing cavities 9 are also three, and are sequentially divided into a first differential routing cavity 11, a second differential routing cavity 12 and a third differential routing cavity 13 from short to long, further, the first routing cavity 11 is located at the inner side of the even module 1, and the third differential routing cavity 13 is located at the outer side of the even module 1.
In this embodiment, the odd-module differential routing cavities 8 and the even-module differential routing cavities 9 are staggered, further, the fourth differential routing cavity 21 is located between the first differential routing cavity 11 and the second differential routing cavity 12, the fifth differential routing cavity 22 is located between the second differential routing cavity 12 and the third differential routing cavity 13, and the sixth differential routing cavity 23 is located outside the third differential routing cavity 13.
In the embodiment, the first bump 5 is arranged on the even module 1 facing the odd module differential wiring cavity 8, the first bump 5 is matched in the odd module differential wiring cavity 8, the second bump 6 is arranged on the odd module 2 facing the even module differential wiring cavity 9, and the second bump 6 is matched in the even module differential wiring cavity 9, so that the odd module 2 and the even module 1 are convenient to install through the first bump 5 and the second bump 6, the installation stability of the odd module 2 and the even module 1 and the structural strength of the odd module are improved, the odd module and the even module are not easy to deform, materials for manufacturing the odd module and the even module are saved, the production cost is reduced, and particularly, the second bumps 6 are arranged on the odd module 2 positioned on two sides of the fourth differential wiring cavity 21, the fifth differential wiring cavity 22 and the sixth differential wiring cavity 23, the even modules 1 positioned at two sides of the first differential wiring cavity 11, the second differential wiring cavity 12 and the third differential wiring cavity 13 are respectively provided with a first bump 5, the even module differential wiring cavity 9 of the first wiring group 3 and the odd module differential wiring cavity 8 of the second wiring group 4 are formed into a cavity through the first bumps 5 and the second bumps 6, so that transmission media in the peripheral area of the wirings of the first wiring group 3 and the second wiring group 4 are changed from air into insulators with cavities, the first bumps 5 and the even modules 1 and the second bumps 6 are made of plastics made of high polymer materials, the dielectric constants of the air are lower than those of the plastics, the dielectric constants of the transmission media in the wiring areas are changed, and the adjustable impedance is in a required range, so that impedance matching is realized.
In this embodiment, at least one connecting portion 7 is disposed in the first differential routing cavity 11, the second differential routing cavity 12, the third differential routing cavity 13, the fourth differential routing cavity 21, the fifth differential routing cavity 22, and the sixth differential routing cavity 23, and the connecting portion 7 can increase structural stability of the odd module 2 and the even module 1, so that stability of installation of the first routing group 3 and the second routing group 4 is ensured.
In this embodiment, as shown in fig. 11, a plurality of mounting slots 36 are arranged side by side on the female end base 32, the parity modules 33 are mounted in the mounting slots 36, and the slot walls of the mounting slots 36 extend upward to form the rib separating walls 35, and the rib separating walls 35 can block the parity modules 33, so that the parity modules 33 are ensured not to deviate in the vertical direction, and the positive position of the terminals of the products pressed at the PCB board ends meets the requirements.
In this embodiment, as shown in fig. 7 and 8, the back of the first bump 5 is provided with the first groove 51, the groove wall thickness of the first groove 51 is uniform, the back of the second bump 6 is provided with the second groove 61, the groove wall thickness of the second groove 61 is uniform, the cavity formed by the first groove 51 and the second groove 61 is an air cavity, the dielectric constant of air in the air cavity is lower than that of plastic, so that the dielectric constant of a transmission medium is changed, therefore, the air cavity formed by the first groove 51 and the second groove 61 can be used for adjusting impedance, so that the odd-even module is matched with the impedance, and the arrangement of the first groove 51 and the second groove 61 also reduces the weight of the odd-even module, reduces the consumption material and saves the production cost.
Although the application has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope and spirit of the principles of this disclosure. More specifically, various variations and modifications may be made to the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, drawings and claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will be apparent to those skilled in the art.
Claims (5)
1. The back board connector for impedance matching comprises a male end base (31), a female end base (32) and an odd-even module (33), wherein the female end base (32) is inserted on the male end base (31), and the odd-even module (33) is installed in the female end base (32), and is characterized in that: the odd-even module (33) comprises an odd module (2) and an even module (1) which are mutually clung, a plurality of odd module differential wiring cavities (8) for arranging a second wiring group (4) are arranged on the odd module (2), a plurality of even module differential wiring cavities (9) for arranging a first wiring group (3) are arranged on the even module (1), the odd module differential wiring cavities (8) and the even module differential wiring cavities (9) are distributed in a staggered manner, a first bump (5) is arranged on the even module (1) which is opposite to the odd module differential wiring cavities (8), the first protruding block (5) is matched in the odd module differential wiring cavity (8), a second protruding block (6) is arranged on the odd module (2) which faces the even module differential wiring cavity (9), the second protruding block (6) is matched in the even module differential wiring cavity (9), a plurality of mounting grooves (36) are arranged on the female end base (32) side by side, the odd-even module (33) is arranged in the mounting grooves (36), the groove walls of the mounting grooves (36) extend upwards to form a rib wall (35), the back surfaces of the first protruding blocks (5) are provided with first grooves (51), the groove wall thicknesses of the first grooves (51) are uniform, the back of the second lug (6) is provided with a second groove (61), and the groove wall thickness of the second groove (61) is uniform.
2. The impedance matched backplane connector of claim 1, wherein: the three odd module differential wiring cavities (8) are sequentially divided into a fourth differential wiring cavity (21), a fifth differential wiring cavity (22) and a sixth differential wiring cavity (23) from short to long, and second bumps (6) are arranged on odd modules (2) positioned on two sides of the fourth differential wiring cavity (21), the fifth differential wiring cavity (22) and the sixth differential wiring cavity (23).
3. The impedance matched backplane connector of claim 1, wherein: the number of the even module differential wiring cavities (9) is three, and the even module differential wiring cavities are sequentially divided into a first differential wiring cavity (11), a second differential wiring cavity (12) and a third differential wiring cavity (13) from short to long, and first bumps (5) are arranged on the even modules (1) positioned on two sides of the first differential wiring cavity (11), the second differential wiring cavity (12) and the third differential wiring cavity (13).
4. The impedance matched backplane connector of claim 3, wherein: at least one connecting part (7) is arranged in the first differential wiring cavity (11), the second differential wiring cavity (12), the third differential wiring cavity (13), the fourth differential wiring cavity (21), the fifth differential wiring cavity (22) and the sixth differential wiring cavity (23).
5. The impedance matched backplane connector of claim 1, wherein: the novel positioning device is characterized in that a first positioning column (41) and a second positioning column (43) which are staggered are arranged on the even module (1), a first positioning hole (42) corresponding to the first positioning column (41) is formed in the odd module (2), and a second positioning hole (44) corresponding to the second positioning column (43) is formed in the odd module (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910049562.8A CN109546458B (en) | 2019-01-18 | 2019-01-18 | Impedance matched back board connector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910049562.8A CN109546458B (en) | 2019-01-18 | 2019-01-18 | Impedance matched back board connector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109546458A CN109546458A (en) | 2019-03-29 |
| CN109546458B true CN109546458B (en) | 2023-11-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910049562.8A Active CN109546458B (en) | 2019-01-18 | 2019-01-18 | Impedance matched back board connector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109546458B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113131265B (en) | 2019-12-31 | 2023-05-19 | 富鼎精密工业（郑州）有限公司 | Electric connector |
| CN113131236B (en) * | 2019-12-31 | 2023-05-16 | 富鼎精密工业（郑州）有限公司 | Electric connector |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003043138A1 (en) * | 2001-11-14 | 2003-05-22 | Fci Americas Technology, Inc. | Cross talk reduction for electrical connectors |
| CN103151649A (en) * | 2013-03-22 | 2013-06-12 | 四川华丰企业集团有限公司 | High-speed signal connector adopting special-shaped shield plate |
| CN104300315A (en) * | 2013-12-05 | 2015-01-21 | 中航光电科技股份有限公司 | Difference module and full-shielding-type difference connector using the module |
| WO2017201170A1 (en) * | 2016-05-18 | 2017-11-23 | Amphenol Corporation | Controlled impedance edged coupled connectors |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8363997B2 (en) * | 2008-12-19 | 2013-01-29 | Commscope, Inc. Of North Carolina | System for intelligent patching of telecommunication cables with a communication network |
-
2019
- 2019-01-18 CN CN201910049562.8A patent/CN109546458B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003043138A1 (en) * | 2001-11-14 | 2003-05-22 | Fci Americas Technology, Inc. | Cross talk reduction for electrical connectors |
| CN103151649A (en) * | 2013-03-22 | 2013-06-12 | 四川华丰企业集团有限公司 | High-speed signal connector adopting special-shaped shield plate |
| CN104300315A (en) * | 2013-12-05 | 2015-01-21 | 中航光电科技股份有限公司 | Difference module and full-shielding-type difference connector using the module |
| WO2017201170A1 (en) * | 2016-05-18 | 2017-11-23 | Amphenol Corporation | Controlled impedance edged coupled connectors |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109546458A (en) | 2019-03-29 |
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Address after: 621000 No. 36 Yuejin Road, Fucheng District, Sichuan, Mianyang Applicant after: Sichuan Huafeng Technology Co.,Ltd. Address before: 621000 No. 36 Yuejin Road, Fucheng District, Sichuan, Mianyang Applicant before: SICHUAN HUAFENG ENTERPRISE GROUP Co.,Ltd. |
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