CN201115280Y - Electromagnetic shielding structure for bar printer - Google Patents
Electromagnetic shielding structure for bar printer Download PDFInfo
- Publication number
- CN201115280Y CN201115280Y CNU2007201701273U CN200720170127U CN201115280Y CN 201115280 Y CN201115280 Y CN 201115280Y CN U2007201701273 U CNU2007201701273 U CN U2007201701273U CN 200720170127 U CN200720170127 U CN 200720170127U CN 201115280 Y CN201115280 Y CN 201115280Y
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- bar code
- electromagnetic
- code printer
- casing
- conductive tape
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Abstract
The utility model relates to an electromagnetic shielding structure of an electric device, in particular to an anti-electromagnetic-radiation and anti-electromagnetic-interference structure of a bar code printer. The utility model adopts an electromagnetic shielding structure of a bar code printer; the anti-electromagnetic-interference structure is provided with a lowpass filter at a power inlet of the bar code printer, a magnetic ring on a data line and an aluminum honeycomb ventilation board which is then grounded at the internal side of a radiating hole. All gaps of the bar code printer are bonded by conductive adhesive tapes; a device shell and the conductive adhesive tapes are grounded. The design of the electromagnetic shielding and static shielding can accord with the standard of electromagnetic interference of an information technological device in special industries and plays an important role in preventing leakage of secret information caused by electromagnetic radiation; the shielding passes the test organized by the national confidential information office and accords with the industrial standard.
Description
Technical field
The utility model relates to a kind of electromagnetic armouring structure of electronic equipment, especially the structure that prevents electromagnetic radiation and electromagnetic interference of bar code printer.
Background technology
The radio frequency interference that it has often been said (Radio Frequency Interference-RFI) is meant the interference of first line electricity broadcasting area.The CISPR that held in Paris in 1934 (CISPR) begins the worldwide organized research to electromagnetic interference and control technology thereof exactly for the first time.Enter today of informationized society the mankind, the electromagnetic wave conduct; A kind of resource in OHz～400GHz wide frequency range, is widely used for information technology; In the product, as automobile, communication, computer, household electrical appliances etc.; Product are gathered around people society and family in large quantities.The companion's and the electromagnetic interference of coming also just from the very low frequency to the microwave band, all-pervasive eradiation or conduct to operating subset or system and environment on every side.The equipment of giving or system and ecology are brought various harm.
Bar code is most economical, practical up to now a kind of automatic identification technology.Barcode technology is created in the '20s in last century the earliest, is born in the laboratory of Westinghouse.The record of the comprehensive bar code symbol of Norm Woodland and Bernard Silver invention has just been arranged for the first time in the patent documentation in 1949, do not had the record of barcode technology in the patent documentation before this all the time, also do not dropped into the precedent of practical application.Develop " two-dimension code " afterwards up to IterfaceMechanisms company in 1970, the equipment of the technology of bar code and the recognition of bar code and printing just is able to use on market.Yet until phase at end of the nineties in last century bar code is just used rapidly on the market of China and is developed.
Bar code is bar, the null symbol of arranging by certain coding rule by a group, in order to the information of representing that certain character, numeral and symbol are formed.Bar code system is read the automatic recognition system of forming by bar code symbol design, making and scanning.Barcode technology has following characteristics:
1, high input speed: compare with the keyboard input, the speed of bar code input is 5 times of the keyboard input, and can realize " instant data input ".
2, reliability height: the key in data error rate is one of three percentages, utilize the OCR error rate be ten thousand/, and adopt the barcode technology error rate be lower than 1,000,000/.
3, Information Monitoring amount is big: utilize traditional bar code once can gather the information of tens characters, two-dimensional bar code more can carry the information of thousands of characters, and certain automatic error correcting capability is arranged.
4, flexible practical: bar code mark both can be used as a kind of means of identification and had used separately, also can form a system with relevant identification equipment and realize automation identification, can also link up the realization automatic management with other control appliances.
5, bar-code label is easy to make, and equipment and material are not had specific (special) requirements, and the identification equipment processing ease does not need Special Training, and equipment also relatively just.
The field of bar code application now is more, and bar code printer also is applied to every field thereupon, comprises that the confidential letters place of government bodies has also used bar code printer.Though but bar code printer has originally passed through the 3C authentication, in electromagnetic compatibility inspection (EMC), passed through authentication, but it does not eliminate the danger of electromagnetic interference and electromagnetic radiation leakage completely, the utility model patent is exactly to have transformed the product TSC TTP-243E PLUS of a market mainstream, make it become a low radiation item code printer, to adapt to the specific demand of special industry, stability, reliability and the fail safe of electromagnetic interference to influence miscellaneous equipment can not take place in Information Technology Equipment in the normal process of using.
Bar code printer of the same trade at present is varied, has not done electromagnetic radiation shielding leakage and the product of electromagnetic interference to ensure information security but see on the market.
The utility model content
The purpose of this utility model has provided a kind of low radiation item code printer, be that the bar code printer TSC TTP-243E PLUS on this general market has been done further improvement, the electromagnetic interference and the electromagnetic radiation leakage (EMI) that are primarily aimed at the electronics and IT products electromagnetic problem have been done the effective precautionary measures, meet special industry to guarantee this bar code printer at aspects such as electromagnetic interference and electromagnetic radiation leakages---and the confidential information processing of government is in the relevant criterion that processor is wanted letters.The bar code printer that uses the utility model to provide can shield and reduce electromagnetic interference and electromagnetic radiation, with stability, reliability and the fail safe of guarantee information technical equipment work, to prevent the electromagnetic radiation leakage of Information Technology Equipment to security information.
The electromagnetic interference of mentioning in the utility model that bar code printer produced and the main source of electromagnetic radiation are that printer can produce intermittently when work or the continuity electric current and voltage changes, especially the rate of change of the transient voltage electric current that begins at print job is quite fast, cause between different frequency, producing electromagnetic energy, in the environment around corresponding circuit then is transmitted into this energy.And the electromagnetic energy that produces is left or is entered another circuit, radiation and conduction by dual mode.Signal radiation is that seam, groove, perforate or other breach by shell lets out; The signal conduction is then left shell by being coupled on power supply, signal and the control line, and free radiation in open space is disturbed or electromagnetic leakage thereby produce.
Secondly, power line is that electromagnetic interference is imported equipment into and spread out of the equipment main path.By power line, the interference on the electrical network can be imported equipment into, the operate as normal of jamming equipment.Equally, the interference of equipment also can be passed on the electrical network by power line, and online miscellaneous equipment is caused interference.
Once more, the data wire that bar code printer connects with PC, be also referred to as the parallel port line, it is the main path of electromagnetic radiation leakage, variation meeting free radiation in free space of the electromagnetic energy that when printer standby or work, produces, thereby the port of parallel port line can make energy be transferred to bar code printer by this parallel port line with this strand energy generation coupling, and electromagnetic interference takes place outward, and be by parallel port line transmission data in the time of PC and bar code printer generation information interaction, the instantaneous variation of electromagnetic energy also can take place in the transmission of these data and the process of acceptance, and the electromagnetic radiation phenomenon takes place.
Design by the utility model electromagnetic shielding and electrostatic screen, can meet special industry for the electromagnetic interference of Information Technology Equipment, especially for the stronger effect that prevents of electromagnetic radiation leakage security information, the effect of this shielding has been passed through the test of national confidential Information Processing Division, has met the use standard of the sector.
Originally be novel technical scheme to be to adopt a kind of electromagnetic armouring structure of bar code printer for achieving the above object, described electromagnetic armouring structure is:
1), low pass filter is installed at the power import place of bar code printer;
2), on data wire, install magnet ring additional;
3), in louvre, survey and install aluminum honeycomb ventilating board additional, and with honeycomb ventilating board ground connection;
4), use all slits of conductive tape adhesive strip code printer;
5), with casing and conductive tape ground connection.
Casing described in the utility model adopts lower casing and upper casing closely to fasten, and described tight fastening is that lower casing contacts the good continuous conduction body that forms with upper casing.
The utility model lower casing and upper casing are to be made by the thick galvanized steel plain sheet of 1mm.
The utility model is installed at described magnet ring in the exit of data wire.
The utility model is bonded with conductive tape at the interface of upper casing and lower casing, and with conductive tape ground connection.
The mains switch of bar code printer described in the utility model is enclosed with conductive tape, and with conductive tape ground connection.
The utility model is bonded with conductive tape in the interface sealing of power line and data wire and casing, and with conductive tape ground connection.
Conductive tape described in the utility model is copper material adhesive tape or aluminium adhesive tape.
Advantage of the present utility model and technique effect are, the electromagnetic interference and the electromagnetic radiation leakage (EMI) that are primarily aimed at the electronics and IT products electromagnetic problem have been done the effective precautionary measures, meet special industry to guarantee this bar code printer at aspects such as electromagnetic interference and electromagnetic radiation leakages---and the confidential information processing of government is in the relevant criterion that processor is wanted letters.The bar code printer that uses the utility model to provide can shield and reduce electromagnetic interference and electromagnetic radiation, with stability, reliability and the fail safe of guarantee information technical equipment work, to prevent the electromagnetic radiation leakage of Information Technology Equipment to security information.
Design by the utility model electromagnetic shielding and electrostatic screen, can meet special industry for the electromagnetic interference of Information Technology Equipment, especially for the stronger effect that prevents of electromagnetic radiation leakage security information, the effect of this shielding has been passed through the test of national confidential Information Processing Division, has met the use standard of the sector.
Description of drawings
Fig. 1 is the electromagnetic armouring structure figure of the utility model bar code printer.
Among the figure: 1, upper casing; 2, lower casing; 3, low pass filter; 4, aluminum honeycomb ventilating board; 5, conductive tape; 6, mains switch.
Embodiment
Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
As shown in Figure 1, the utility model mainly comprises two aspects about electromagnetic problem: electromagnetic interference, electromagnetic radiation (EMI) and electromagnetic compatibility (EMC).EMI be meant any high-frequency apparatus or system intrinsic may cause that performance own reduces, perhaps the user is produced a kind of electromagnet phenomenon of injury, comprised that equipment or system suffer the interference and self electromagnetic effect two aspect to external environment condition of external electromagnetic environment; And EMC mainly is the shielding problem that solves above-mentioned electromagnetic interference/radiation.
What the utility model was related is improved bar code printer to be a universal printer of TSC manufacturer production, it has passed through the 3C authentication, the 3C authentication comprises electromagnetic compatibility (EMC), that is to say that it is to have met civilian standard on the electromagnetic problem of circuit main board, but also do not reach this machine-operated application standard for this standard of national confidential Information Processing Division that requirements at the higher level are arranged, just higher requirement has been arranged yet for the shielding of bar code printer.The problem that the utility model solves electromagnetic interference and electromagnetic radiation need can not leak its information the electromagnetic interference that variation took place of the relevant electromagnetic energy of printer and ELECTROMAGNETIC RADIATION SHIELDING in a relative less zone.
According to the notion that shields in the electronics, shielding is exactly to carrying out the isolation of metal between two area of space, to control electric field, magnetic field and electromagnetic wave by induction and the radiation of a zone to another zone.Specifically, be surrounded with the interference source of shield exactly, prevent that interfere with electromagnetic field is to outdiffusion component, circuit, sub-assembly, cable or whole system; With shield receiving circuit, equipment or system are surrounded, prevent that they are subjected to the influence of external electromagnetic field.
Influence the shield screening effectiveness and mainly contain two factors: one is that whole shield surface must be that conduction is continuous, and another is that the conductor that directly penetrates shield can not be arranged.Popular in fact says, electromagnetic shielding is exactly that the shell that need make with soft magnetic metallic material is with the equipment sealing or be close to and be closed, with the measure that prevents that external electromagnetic field from disturbing to external world to the electromagnetic field of the influence of equipment or equipment.
Bar code printer contains microprocessor impulse circuit, coil paper and is used to roll up the motor of carbon ribbon, they can both produce stronger electromagnetic interference and electromagnetic radiation leakage, screening effectiveness the utility model has designed metal shell for bar code printer in order to reach preferably, as the foundation of the continuous obturator of its conduction.
The utility model should be the above galvanized steel plain sheet of 1mm as the machine casing that shielding frequency electromagnetic waves ability is arranged at least, what we selected for use is exactly the thick galvanized steel plain sheet of 1mm, and sheet material is the SECC cold galvanizing steel plate that has passed through special processing, characteristics such as the casing that such steel plate is made has high shielding, high conductivity, good rigidly, be difficult for getting rusty, corrosion-resistant.Because the conductance of cold galvanizing steel plate so the electromagnetic radiation inside and outside the casing is had certain shielding action, can effectively prevent electromagnetic radiation and interference than higher.
Shield produces reciprocal eddy current magnetism and former magnetic field cancellation and weakens high frequency magnetic field and disturb under the effect of high frequency magnetic field.If shield is imperfect, the effect of eddy current reduces, and promptly Ping Bi effect is had a greatly reduced quality.Yet because this bar code printer is to need to follow extraneous interactive information, so the shell of this bar code printer obviously can not be made the metallic object of complete closed to reach best shield effectiveness.It should comprise exit slot, power supply access port, switch mouth, data wire access port, louvre.It need be divided into the structure of upper casing 1, lower casing 2, in order to open casing easily, does operations such as changing paper or maintenance.Opening on these casings, the place that device is connected is direct radiation externally, and these parts will be done other processing to reach shield effectiveness preferably.
At first casing is divided into upper casing 1,2 two parts of lower casing, select for use hinge (hinge) can make the good backward folding of upper casing 1 easy to use, the place of upper and lower enclosure contact is exposed conduction, the utility model has been done outstanding processing around lower casing 2, utilize such treatment effect, can be so that upper and lower enclosure can excellent contact in closure.
Secondly the mainboard of printer is mounted in the lower casing bottom, the double-screw bolt that the utility model is installed the printer mainboard conducts electricity, link together by double-screw bolt and the lower casing 2 that mainboard is installed by producing a ground wire on the mainboard, the electromotive force that makes the upper and lower enclosure closure form sealing afterwards is zero housing, can reach shield effectiveness preferably.
For the processing of casing opening, the utility model has been done the following aspects:
1, for the switch mouth
2, for the data wire access port
The data wire that the utility model adopts is general parallel port line, the size of casing upper shed is 70 * 17mm, the parallel port is the plastic device that metal shell is arranged, profile is irregular rectangle, two ends have the shape of fillet, after installing the parallel port, this opening still is one of source mouth of an electromagnetic interference and electromagnetic radiation leakage, and it makes the surface of shield that the discontinuous conduction zone arranged.Processing usefulness conductive tape 5 too for this mouthful, at first conductive tape 5 is lived the parallel port opening from the inner card of casing, then this adhesive plaster is being left a seam from the centre, parallel port device on the printer is stretched from this slit, conducting adhesive cloth can contact with the metal shell of device, and making does not have the slit between parallel port device and the shell aperture.Allow this opening prevent that the effect of electromagnetic interference and electromagnetic leakage from reaching best like this.
3, louvre
So because electronic message unit is that heat-producing device will have rational radiator structure, the aperture size of theoretical ideal is r/30 (r is a wavelength), such perforate can be looked after the radiating requirements of cabinet, can effectively prevent irradiation of electromagnetic waves again.The utility model is provided with size, and to be respectively 30 * 30mm, 170 * 30mm, 150 * 30mm three be that the spacing that the circular hole of diameter forms is the array louvre of 5mm with 1mm at the both sides of casing and three places, front.The louvre of this form has not influenced the electromagnetic radiation of some frequencies, but still needs to do certain processing at the high frequency electromagnetic radiation from the printer mainboard.The utility model in the installed inside of louvre aluminum honeycomb ventilating board 4, and make its card and casing surface, with the casing excellent contact,,, allow the EMI conductively-closed so it can form good ground connection outlet because casing has connect ground wire.
Aluminum honeycomb ventilating board 4 is cellular boards that aluminium foil is made, and its surface becomes cellular, and the cut-off waveguide that it can be good, this product are the requirements that takes into account shielding and ventilation quantity.Its surface can excellent contact with iron-clad, and its structure can guarantee the printer ventilation and heat, and electromagnetic radiation as waves can not be passed.
4, exit slot opening
The exit slot of printer is the slit of a 116mm, width is that the width of paper gets final product in principle, but such width can not make the normal paper delivery of printer, because printhead has the distance of 14mm to exit slot, paper varies, certain toughness is also arranged, so too little often paper delivery normally of A/F, and opening has reduced screening effectiveness too greatly, so the utility model has been done in the 14mm between the printhead distance at exit slot and has been led the paper passage, can solve the paper delivery problem under the enough little situation of exit slot width.Exit slot can be accomplished the 2mm width.
5, power supply access port
Power line is that electromagnetic interference is imported equipment into and spread out of the equipment main path.By power line, the interference on the electrical network can be imported equipment into, the operate as normal of jamming equipment.Equally, the interference of equipment also can be passed on the electrical network by power line, and online miscellaneous equipment is caused interference.Interfered circuit on the power line occurs with two kinds of forms.A kind of is in the Live line Zero line loop, and its interference is called as differential mode interference.Another kind be with the loop of live wire, zero line and ground wire and the earth in, be called common mode disturbances.When 200Hz was following usually, the differential mode interference composition accounted for major part.When 1MHz was above, the common mode disturbances composition accounted for main component.Power-supply filter all has inhibitory action to differential mode interference and common mode disturbances, but because the circuit structure difference is different to the inhibition effect of differential mode interference and common mode disturbances.In order to prevent the generation of both of these case, must a low pass filter 3 be installed at the power import place of equipment, be also referred to as power line filter.
The microprocessor of containing impulse circuit is arranged in the bar code printer, the motor that coil paper and volume carbon ribbon are arranged, all be to produce the equipment that is also disturbed by extraneous electronics and IT products easily than strong jamming by power line easily, the effect of power line filter is to prevent that the electromagnetic interference that equipment itself produces from entering power line, prevents the interference access arrangement on the power line simultaneously.
Power line filter is a kind of low pass filter 3, and it allows the operating current of direct current or 50Hz to pass through, and the higher electromagnetic interference electric current of tolerance frequency does not pass through.Power line filter is two-way, and it can prevent the interference access arrangement on the electrical network, makes equipment can satisfy in the electromagnetic compatibility standard requirement to conduction emission and conducted susceptibility, again can the stronger radiated interference of suppression equipment generation.
In addition, under the state of printer work or standby, especially in working order the moment that begins, being connected the data wire on the printer---the parallel port line is the main path of electromagnetic radiation leakage, it is next from internally extending of printer to be equivalent to a conductor, it is the equal of the conductor that passes shield, has destroyed the screening effectiveness of shield.Variation meeting free radiation in free space of the electromagnetic energy that when printer standby or work, produces, thereby the port of parallel port line can make energy be transferred to bar code printer by this parallel port line with this strand energy generation coupling, and electromagnetic interference takes place outward, and be by parallel port line transmission data in the time of PC and bar code printer generation information interaction, the instantaneous variation of electromagnetic energy also can take place in the transmission of these data and the process of acceptance, and the electromagnetic radiation phenomenon takes place.
The electromagnetic radiation phenomenon is accompanied by the danger of electromagnetic radiation leakage security information, for the electromagnetic radiation leakage that makes be reduced to minimum, we have installed magnet ring to data wire.
The effect of magnet ring mainly is the signal radiation inhibition to certain frequency, and the cover magnet ring prevents the electromagnetic interference in space mainly in order to reduce the interference of high-frequency noise and spike on the holding wire, makes transmission more stable.The single turn reactor that is equivalent to two wire-wounds behind the holding wire adding magnet ring; if when the electric current that equals to flow out that flows into induction reactance be the zero defeated electric current that flows in outflow not simultaneously (when existing interference signal is infiltrated) conductively-closed is fallen; operation principle and earth leakage protective device are about the same; just on magnet ring, added a winding; be equivalent to all go here and there on the every holding wire inductance; reduce the interference of high-frequency noise and spike, play the effect of High frequency filter.
Claims (8)
1, a kind of electromagnetic armouring structure of bar code printer is characterized in that described electromagnetic armouring structure is:
1), low pass filter is installed at the power import place of bar code printer;
2), on data wire, install magnet ring additional;
3), in louvre, survey and install aluminum honeycomb ventilating board additional, and with honeycomb ventilating board ground connection;
4), use all slits of conductive tape adhesive strip code printer;
5), with casing and conductive tape ground connection.
2, the electromagnetic shielding method of bar code printer as claimed in claim 1 is characterized in that described casing adopts lower casing and upper casing closely to fasten, and described tight fastening is that lower casing contacts the good continuous conduction body that forms with upper casing.
3, the electromagnetic armouring structure of bar code printer as claimed in claim 2 is characterized in that lower casing and upper casing are to be made by the thick galvanized steel plain sheet of 1mm.
4, the electromagnetic armouring structure of bar code printer as claimed in claim 3 is characterized in that described magnet ring is installed at the exit of data wire.
5, the electromagnetic armouring structure of bar code printer as claimed in claim 4 is characterized in that being bonded with conductive tape at the interface of upper casing and lower casing, and with conductive tape ground connection.
6, the electromagnetic armouring structure of bar code printer as claimed in claim 5 is characterized in that the mains switch of described bar code printer is enclosed with conductive tape, and with conductive tape ground connection.
7, the electromagnetic armouring structure of bar code printer as claimed in claim 6 is characterized in that being bonded with conductive tape in the interface sealing of power line and data wire and casing, and with conductive tape ground connection.
8,, it is characterized in that described conductive tape is copper material adhesive tape or aluminium adhesive tape as the electromagnetic armouring structure of the described bar code printer of arbitrary claim in the claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201701273U CN201115280Y (en) | 2007-08-09 | 2007-08-09 | Electromagnetic shielding structure for bar printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201701273U CN201115280Y (en) | 2007-08-09 | 2007-08-09 | Electromagnetic shielding structure for bar printer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201115280Y true CN201115280Y (en) | 2008-09-10 |
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ID=39967033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201701273U Expired - Fee Related CN201115280Y (en) | 2007-08-09 | 2007-08-09 | Electromagnetic shielding structure for bar printer |
Country Status (1)
| Country | Link |
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| CN (1) | CN201115280Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103456373A (en) * | 2013-09-09 | 2013-12-18 | 太仓斯普宁精密机械有限公司 | Printer shield |
| CN107797432A (en) * | 2017-11-20 | 2018-03-13 | 贵州云侠科技有限公司 | A kind of radiation proof laser printer box and laser printer suit |
| CN107901614A (en) * | 2017-11-20 | 2018-04-13 | 贵州云侠科技有限公司 | A kind of laser printer barrier box and laser printer suit |
| CN110843363A (en) * | 2019-12-23 | 2020-02-28 | 安方高科电磁安全技术(北京)有限公司 | Low-leakage printer |
| CN114709675A (en) * | 2021-12-13 | 2022-07-05 | 陕西航空电气有限责任公司 | Electromagnetic compatibility shielding bush of power socket |
-
2007
- 2007-08-09 CN CNU2007201701273U patent/CN201115280Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103456373A (en) * | 2013-09-09 | 2013-12-18 | 太仓斯普宁精密机械有限公司 | Printer shield |
| CN107797432A (en) * | 2017-11-20 | 2018-03-13 | 贵州云侠科技有限公司 | A kind of radiation proof laser printer box and laser printer suit |
| CN107901614A (en) * | 2017-11-20 | 2018-04-13 | 贵州云侠科技有限公司 | A kind of laser printer barrier box and laser printer suit |
| CN110843363A (en) * | 2019-12-23 | 2020-02-28 | 安方高科电磁安全技术(北京)有限公司 | Low-leakage printer |
| CN114709675A (en) * | 2021-12-13 | 2022-07-05 | 陕西航空电气有限责任公司 | Electromagnetic compatibility shielding bush of power socket |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Ji Lei Inventor after: Deng Puyu Inventor before: Cai Jiangtao Inventor before: Zhao Xiang Inventor before: Wang Houjian |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: CAI JIANGTAO; ZHAO XIANG; WANG HOUJIAN TO: JI LEI; DENG POYU |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080910 Termination date: 20150809 |
|
| EXPY | Termination of patent right or utility model |