CN100502171C - Production technique of cylinder type contact pin for electric connection - Google Patents
Production technique of cylinder type contact pin for electric connection Download PDFInfo
- Publication number
- CN100502171C CN100502171C CNB2007100711304A CN200710071130A CN100502171C CN 100502171 C CN100502171 C CN 100502171C CN B2007100711304 A CNB2007100711304 A CN B2007100711304A CN 200710071130 A CN200710071130 A CN 200710071130A CN 100502171 C CN100502171 C CN 100502171C
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- Prior art keywords
- pull
- stretch
- highly
- contact pin
- diameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 238000000034 method Methods 0.000 title description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052802 copper Inorganic materials 0.000 claims abstract description 21
- 239000010949 copper Substances 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000011265 semifinished product Substances 0.000 claims description 15
- 239000000047 product Substances 0.000 claims description 9
- 238000001125 extrusion Methods 0.000 claims description 4
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000000465 moulding Methods 0.000 abstract 1
- 230000000750 progressive effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 1
Images
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
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/16—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for manufacturing contact members, e.g. by punching and by bending
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/14—Spinning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
-
- 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
- H01R13/02—Contact members
- H01R13/04—Pins or blades for co-operation with sockets
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacturing Of Electrical Connectors (AREA)
- Forging (AREA)
Abstract
This invention relates to a processing technology for cannon pins including the following steps: a, selecting a ribbon copper of 21-25mm wide and 0.4-0.6mm thick and putting it to a feeder, b, sending the ribbon cupper to a stretching concave die from the feeder for stretching several times to form a cylindrical pin blank material meeting the specification, c, cutting the tail of the blank material to a plane with a cutting machine, d, clamping the blank material horizontally onto a clamping chuck of an automatic lathe in the rotation speed of 5000-6000turns/min to be squeezed to molding.
Description
Technical field
The present invention relates to a kind of manufacture craft of the cylinder type contact pin that is used for being electrically connected on the plug.
Background technology
The circular contact pin of existing European plugs is to be formed by automatic lathe car system with copper rod, and this production technology has that to consume copper material many, production cost height, and the daily output problem of hanging down etc.In resource scarcity at present, advocate under the energy-saving and cost-reducing situation energetically, this traditional handicraft need be improved.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of performance that neither influences contact pin at above-mentioned prior art present situation, can reduce the manufacture craft of the cylinder type contact pin that is used to be electrically connected of manufacturing cost again greatly.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: the manufacture craft of the cylinder type contact pin that this is used to be electrically connected is characterized in that comprising the steps:
The first step: select materials, select wide 21～25mm, the copper strips of thick 0.4～0.6mm, and place on the feed appliance;
Second step: the punching press pull and stretch, copper strips is delivered to continuous for several times continuously level pull and stretch on the pull and stretch progressive die by feed appliance, to cylindrical shape semi-finished product contact pin up to specification;
The 3rd step: afterbody is cut flat, cuts the afterbody of cylindrical shape semi-finished product contact pin up to specification flat;
The 4th step: extrusion molding on the lathe, afterbody is cut flat cylindrical shape semi-finished product contact pin, and laterally to be folded in rotating speed be on 5000～6000 rev/mins the chuck of automatic lathe, vertically push the contact pin position of the shape of need contracting by the extruding cutter head then, it is squeezed contracts shape and reach the contact pin of finished product.
Above-mentioned number of drawing is advisable with six pull and stretch, but contact pin to different size, different when each pull and stretch, be diameter 4.8mm, highly be the contact pin of 31.5mm as specification, it is to be 21.5mm cylindrical shape blank at the next diameter of strip upper punch for the first time, and pull and stretch becomes diameter to be 14.5mm, highly to be to be shaped the cylindrical work pieces of 7.4mm and then by manipulator workpiece to be sent into next station; For the second time pull and stretch becomes diameter to be 11.6mm, highly to be the cylindrical workpiece of 11.4mm; Pull and stretch becomes diameter 9.2mm, highly is the cylindrical workpiece of 15.5mm for the third time; The 4th pull and stretch becomes diameter 7.3mm, highly is the cylindrical workpiece of 21.5mm; The 5th pull and stretch becomes diameter 5.8mm, highly is the cylindrical workpiece of 28mm; The 6th pull and stretch becomes diameter 4.8mm, highly is the cylindrical shape semi-finished product contact pin of 35mm.
And specification is diameter 4.0mm, highly is the contact pin of 28.5mm, it is to be 20.0mm cylindrical shape blank at the next diameter of strip upper punch for the first time, and pull and stretch becomes diameter to be 12.5mm, highly to be to be shaped the cylindrical work pieces of 7.5mm and then by manipulator workpiece to be sent into next station; For the second time pull and stretch becomes diameter to be 10.0mm, highly to be the cylindrical workpiece of 11.5mm; Pull and stretch becomes diameter 8.0mm, highly is the cylindrical workpiece of 16.5mm for the third time; The 4th pull and stretch becomes diameter 6.5mm, highly is the cylindrical workpiece of 21.5mm; The 5th pull and stretch becomes diameter 5.2mm, highly is the cylindrical workpiece of 27.5mm; The 6th pull and stretch becomes diameter 4.0mm, highly is the cylindrical shape semi-finished product contact pin of 31.5mm.
It is the alloy steel ball of 1.0mm～6.0mm that described extruding cutter head is selected diameter for use.
Compared with prior art, the present invention adopts continuous progressive die pull and stretch and automatic lathe to push the shape of contracting and processes process combined, meet the finished product contact pin structure that overall dimension requires and make, can reduce production costs significantly like this, save material, and have excellent mechanical intensity and electric conductivity, after tested, parameters such as its mechanical strength, ampacity meet and exceed the performance of copper rod car product.
Description of drawings
Fig. 1 is the structural representation of the punching press deep-drawing technique of the reflection embodiment of the invention;
Fig. 2 is the contract structural representation of shape technology of the extruding of the reflection embodiment of the invention;
Fig. 3 is the profile schematic diagram of finished product contact pin.
Fig. 4 is the cutaway view of Fig. 3 along the A-A line.
Fig. 5 is the structural representation of the another kind of specification product embodiments of explained hereafter of the present invention.
Fig. 6 is the cutaway view of Fig. 5 along the B-B line.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Embodiment one: existing be 4.8mm, highly be that the European plugs circle contact pin 9 of 31.5mm is an example that to make diameter it specifically includes following steps:
The first step: select materials: choose wide 24.5mm, the copper strips 1 of thick 0.5mm, and place on the feed appliance 2.
Second step: the progressive die continuous drawing draws copper pipe
With reference to shown in Figure 1, this contact pin 9 is to form through continuous six road pull and stretch.By auto-feeder 2 with wide 24.5mm, the copper strips 1 of thick 0.5mm step pitch is in accordance with regulations sent constantly into mould 3,5, first road is a 21.5mm cylindrical shape blank at the next diameter of strip upper punch, and pull and stretch becomes diameter to be 14.5mm, highly to be to be shaped the cylindrical work pieces of 7.4mm and then by manipulator 4 workpiece to be sent into next station; The second road pull and stretch becomes diameter to be 11.6mm, highly to be the cylindrical workpiece of 11.4mm; The 3rd road pull and stretch becomes diameter 9.2mm, highly is the cylindrical workpiece of 15.5mm; The 4th road pull and stretch becomes diameter 7.3mm, highly is the cylindrical workpiece of 21.5mm; The 5th road pull and stretch becomes diameter 5.8mm, highly is the cylindrical workpiece of 28mm; The 6th road pull and stretch becomes diameter 4.8mm, highly is the cylindrical workpiece of 35mm.
The 3rd step: afterbody is cut flat
With the above-mentioned cylindrical shape semi-finished product contact pin 9 that makes ' afterbody cut flatly, make diameter and be 4.8mm, highly be the cylindrical shape copper pipe of 31.5mm;
The 4th step: automatic lathe 7 extrusion processes
Contact pin 9 is typically provided with the annular groove of undergauge thereon owing to the needs that the basic shell that insulate with socket connects, and the contact pin 9 of different size, and its groove position is all different.This operation be exactly for Manufactured diameter 4.8mm, height for the cylindrical shape copper pipe of 31.5mm in the middle part 91 and rear portion 92 shape of contracting make the product that profile reaches dimensional requirement.
With reference to shown in Figure 2, be on 5000 rev/mins the chuck of automatic lathe 7 with semi-finished product contact pin 9 ' laterally be folded in rotating speed, extruding cutter head 82 is fixed on the knife rest 8 that can vertically move forward and backward, knife rest 8 is installed on the planker of horizontal move left and right, and the alloy steel ball 81 that in this extruding cutter head 82 diameter to be arranged be 4.0mm.During work, when planker moves to workpiece (the be semi-finished product contact pin 9 ') shaped position that contracts, knife rest 8 feed forward makes vertically extruding workpiece of extruding cutter head 82, extruding cutter head 82 contacts generation high temperature with the copper pipe of high speed rotating, copper pipe is squeezed contract shape and meets the requirements of size.Equally, with another be fixed on the frame cutter head 71 vertically extruding and semi-finished product contact pin 9 ' middle part 91 produce the shape of contracting together.
Embodiment two: shown in Fig. 5 and Fig. 6 is contact pin 9 structures that adopt another specification that the present invention makes, because it has any different with embodiment one described contact pin 9 on size, profile, therefore different on each processing step.Contact pin 9 its specifications shown in the present embodiment are diameter 4.0mm, highly are 28.5mm that there is a undergauge section outside middle part 93.
The first step: select materials
Choose wide 22mm, the copper strips 1 of thick 0.5mm, and place on the feed appliance 2.
Second step: the progressive die continuous drawing draws copper pipe
Also can be with reference to shown in Figure 1, this contact pin 9 also is to form through continuous six road pull and stretch.By auto-feeder 5 with wide 22mm, the copper strips 1 of thick 0.5mm step pitch is in accordance with regulations sent constantly into mould 3, first road is a 20.0mm cylindrical shape blank at the next diameter of strip upper punch, and pull and stretch becomes diameter to be 12.5mm, highly to be to be shaped the cylindrical work pieces of 7.5mm and then by manipulator 4 workpiece to be sent into next station; The second road pull and stretch becomes diameter to be 10.0mm, highly to be the cylindrical workpiece of 11.5mm; The 3rd road pull and stretch becomes diameter 8.0mm, highly is the cylindrical workpiece of 16.5mm; The 4th road pull and stretch becomes diameter 6.5mm, highly is the cylindrical workpiece of 21.5mm; The 5th road pull and stretch becomes diameter 5.2mm, highly is the cylindrical workpiece of 27.6mm; The 6th road pull and stretch becomes diameter 4.0mm, highly is the cylindrical workpiece of 31.5mm.
The 3rd step: afterbody is cut flat
With the above-mentioned cylindrical shape semi-finished product contact pin 9 that makes ' afterbody cut flatly, make diameter and be 4.0mm, highly be the cylindrical shape copper pipe of 28.5mm;
The 4th step: automatic lathe 7 extrusion processes
This operation and embodiment one roughly the same are fixed on the cylindrical shape copper pipe on the chuck of lathe, contract shape and make the product that profile reaches dimensional requirement with extruding position, 82 pairs of intermediate portions of cutter head 93.
Can obtain finished product contact pin 9 structures (as Fig. 3-shown in Figure 6) of hollow one by above-mentioned processing technology, this structure is not only economized material but also can guarantee contact pin 9 original electric conductivity and mechanical strengths, and after tested, its mechanical strength, ampacity and other parameter all meet and exceed the contact pin performance that real core copper rod forms through automatic lathe car system.
Claims (4)
1, a kind of manufacture craft of the cylinder type contact pin that is used to be electrically connected is characterized in that comprising the steps:
A, select materials, select wide 21～25mm, the copper strips of thick 0.4～0.6mm (1), and place on the feed appliance (2);
B, punching press pull and stretch are delivered to into a continuous for several times continuously level pull and stretch on the pull and stretch level mould with copper strips (1) by feed appliance (2), to cylindrical shape semi-finished product contact pin (9 ') up to specification;
C, afterbody are cut flat, cut the afterbody of cylindrical shape semi-finished product contact pin (9 ') up to specification flat;
Extrusion molding on d, the lathe, afterbody is cut flat cylindrical shape semi-finished product contact pin (9 '), and laterally to be folded in rotating speed be on 5000～6000 rev/mins the chuck of automatic lathe (7), then by the vertical extruding contact pin position that need contract shape of extruding cutter head (82,71), it is squeezed contracts shape and reach the contact pin (9) of finished product.
2, the manufacture craft of the cylinder type contact pin that is used to be electrically connected according to claim 1, it is characterized in that: the number of times of described several pull and stretch is six pull and stretch, be 21.5mm cylindrical shape blank at the next diameter of strip upper punch for the first time, and pull and stretch becomes diameter to be 14.5mm, highly to be to be shaped the cylindrical work pieces of 7.4mm and then by manipulator (4) workpiece to be sent into next station; For the second time pull and stretch becomes diameter to be 11.6mm, highly to be the cylindrical workpiece of 11.4mm; Pull and stretch becomes diameter 9.2mm, highly is the cylindrical workpiece of 15.5mm for the third time; The 4th pull and stretch becomes diameter 7.3mm, highly is the cylindrical workpiece of 21.5mm; The 5th pull and stretch becomes diameter 5.8mm, highly is the cylindrical workpiece of 28mm; The 6th pull and stretch becomes diameter 4.8mm, highly is the cylindrical shape semi-finished product contact pin (9 ') of 35mm.
3, the manufacture craft of the cylinder type contact pin that is used to be electrically connected according to claim 1, it is characterized in that: the number of times of described several pull and stretch is six pull and stretch, be 20.0mm cylindrical shape blank at the next diameter of strip upper punch for the first time, and pull and stretch becomes diameter to be 12.5mm, highly to be to be shaped the cylindrical work pieces of 7.5mm and then by manipulator (4) workpiece to be sent into next station; For the second time pull and stretch becomes diameter to be 10.0mm, highly to be the cylindrical workpiece of 11.5mm; Pull and stretch becomes diameter 8.0mm, highly is the cylindrical workpiece of 16.5mm for the third time; The 4th pull and stretch becomes diameter 6.5mm, highly is the cylindrical workpiece of 21.5mm; The 5th pull and stretch becomes diameter 5.2mm, highly is the cylindrical workpiece of 27.5mm; The 6th pull and stretch becomes diameter 4.0mm, highly is the cylindrical shape semi-finished product contact pin (9 ') of 31.5mm.
4, as the manufacture craft of claim 1 or the 2 or 3 described cylinder type contact pins that are used to be electrically connected, it is characterized in that: described extruding cutter head (82) is the alloy steel ball (81) that a diameter is 1.0mm～6.0mm.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100711304A CN100502171C (en) | 2007-09-11 | 2007-09-11 | Production technique of cylinder type contact pin for electric connection |
| ES08014031T ES2373609T3 (en) | 2007-09-11 | 2008-08-05 | PROCESS OF ELABORATION OF CYLINDRICAL CONNECTOR PLUGS FOR ELECTRICAL CONNECTION AND CONNECTOR PLUGS ELABORATED THROUGH THIS PROCESS. |
| EP20080014031 EP2037547B1 (en) | 2007-09-11 | 2008-08-05 | Manufacturing process of cylinder plug pins for electric connection and plug pins manufactured in this process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100711304A CN100502171C (en) | 2007-09-11 | 2007-09-11 | Production technique of cylinder type contact pin for electric connection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101136532A CN101136532A (en) | 2008-03-05 |
| CN100502171C true CN100502171C (en) | 2009-06-17 |
Family
ID=39160448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100711304A Active CN100502171C (en) | 2007-09-11 | 2007-09-11 | Production technique of cylinder type contact pin for electric connection |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2037547B1 (en) |
| CN (1) | CN100502171C (en) |
| ES (1) | ES2373609T3 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101330188B (en) * | 2008-07-01 | 2010-06-02 | 虞寅达 | Method for preparing cylindrical pin for electric connection |
| CN101719617B (en) * | 2008-10-09 | 2013-12-04 | 陈志锋 | Making process of power electrode product and special equipment thereof |
| KR101081022B1 (en) | 2011-06-14 | 2011-11-09 | 이완규 | Device and mathod for a manufacturing cold forging of hollow power plug pin |
| DE102012002350A1 (en) | 2011-07-20 | 2013-01-24 | Bals Elektrotechnik Gmbh & Co. Kg | Contact element for an electrical connector device |
| CN102801080B (en) * | 2012-08-02 | 2016-08-10 | 慈溪市绿绿电子有限公司 | A kind of processing technology transferring connection terminal cylinder type contact pin part for numeral |
| CN102832526B (en) * | 2012-09-17 | 2015-07-22 | 遵义市飞宇电子有限公司 | Processing method of assembly of contact pin |
| CN106532311B (en) * | 2016-12-22 | 2018-09-25 | 虞东升 | Cylindrical pin and its plug |
| CN107834243A (en) * | 2017-11-02 | 2018-03-23 | 江苏和飞航天电子有限公司 | A kind of Novel end face contacts socket terminal |
| CN109205244A (en) * | 2018-10-09 | 2019-01-15 | 凯尔信汽车零部件（京山）有限公司 | A kind of pre-inserted shear of material of band assembly |
| CN112490820B (en) * | 2020-10-20 | 2022-05-06 | 常州市史美尔精密机械科技有限公司 | Machine tool machining process of connector metal piece |
| CN112864762A (en) * | 2020-12-22 | 2021-05-28 | 深圳市巴科光电科技股份有限公司 | Double-station bending mechanism for LED display screen connector |
| CN112756913B (en) * | 2020-12-28 | 2023-01-06 | 成都爱美科科技材料有限公司 | Method for preparing discharge spout of noble metal bushing for glass fiber production |
| CN116191163B (en) * | 2023-05-04 | 2023-07-07 | 江西海桦电子有限公司 | Pin forming machine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4434552A (en) * | 1982-03-01 | 1984-03-06 | The Bendix Corporation | Method of making a pin type electrical connector contact |
| DE128990T1 (en) | 1983-06-21 | 1985-05-09 | Cemrep, La Bresse | ELECTRICALLY CONDUCTIVE PIN FOR AN ELECTRICAL PLUG. |
| US4820207A (en) * | 1985-12-31 | 1989-04-11 | Labinal Components And Systems, Inc. | Electrical contact |
| JP4745481B2 (en) | 2000-02-15 | 2011-08-10 | 株式会社放電精密加工研究所 | Progressive processing machine |
| KR100475838B1 (en) * | 2002-05-01 | 2005-03-10 | 유태승 | manufacture method and apparatus mold of electrode for power plug |
-
2007
- 2007-09-11 CN CNB2007100711304A patent/CN100502171C/en active Active
-
2008
- 2008-08-05 ES ES08014031T patent/ES2373609T3/en active Active
- 2008-08-05 EP EP20080014031 patent/EP2037547B1/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| 带料连续拉深的形式及工艺切口的选择. 张正修，马新梅，李欠娃.机械工人（热加工），第2期. 2003 |
| 带料连续拉深的形式及工艺切口的选择. 张正修，马新梅，李欠娃.机械工人（热加工），第2期. 2003 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101136532A (en) | 2008-03-05 |
| EP2037547A1 (en) | 2009-03-18 |
| EP2037547B1 (en) | 2011-10-26 |
| ES2373609T3 (en) | 2012-02-07 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: NINGBO KAIFANG ELECTRIC APPLIANCE CO., LTD. Assignor: Yu Yinda Contract fulfillment period: 2009.7.1 to 2015.7.1 Contract record no.: 2009330002068 Denomination of invention: Production technique of cylinder type contact pin for electric connection Granted publication date: 20090617 License type: Exclusive license Record date: 20090819 |
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| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.7.1 TO 2015.7.1; CHANGE OF CONTRACT Name of requester: NINGBO KAIFENG ELECTRIC APPLIANCE CO., LTD. Effective date: 20090819 |
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| TR01 | Transfer of patent right |
Effective date of registration: 20200805 Address after: 315314 shenshiqiao village, Guanhaiwei town, Cixi City, Zhejiang Province Patentee after: Cixi Yinsheng Electric Appliance Co., Ltd Address before: 315300 Zhejiang city of Cixi province Zhangqi town Ba Li Cun, Cixi Yinsheng electronic components factory Patentee before: Yu Yinda |
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| TR01 | Transfer of patent right |