WO2003106088A1 - ワイヤ放電加工機の加工電源装置 - Google Patents
ワイヤ放電加工機の加工電源装置 Download PDFInfo
- Publication number
- WO2003106088A1 WO2003106088A1 PCT/JP2002/005848 JP0205848W WO03106088A1 WO 2003106088 A1 WO2003106088 A1 WO 2003106088A1 JP 0205848 W JP0205848 W JP 0205848W WO 03106088 A1 WO03106088 A1 WO 03106088A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- discharge
- voltage
- machining
- pulse voltage
- power supply
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
- B23H1/022—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges for shaping the discharge pulse train
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
- B23H7/04—Apparatus for supplying current to working gap; Electric circuits specially adapted therefor
Definitions
- the present invention relates to an improvement in a machining power supply device used for a wire electric discharge machine for machining a workpiece by electric discharge between a wire electrode and the workpiece.
- an insulating working fluid is interposed between a pole between a wire electrode and a workpiece, and a machining power is applied to the pole from a heating power supply device while relatively moving the wire electrode and the workpiece.
- the workpiece is supplied and processed by the discharge energy.
- machining power supply device of a conventional wire electric discharge machine used for such wire electric discharge machining for example, Japanese Patent Application Laid-Open Nos. H08-14438, H08-302022, and There is a processing power supply device disclosed in Japanese Patent Application Laid-Open Nos. 9-183019 and 7-290317.
- These machining power supply devices apply an electric discharge induced voltage of both polarities to the gap to generate a discharge, and then superimpose a main discharge current for machining. Focusing only on the purpose of prevention, the polarity is switched to improve the bias of the polarity of the discharge induced voltage.
- the polarity switching of the bipolar voltage is carried out for the purpose of improving the bias of the polarity. If an abnormality occurs, it is necessary to decelerate, stop or retreat the machining feed, or increase the pause time of the applied voltage pulse, etc., resulting in a problem that machining efficiency is reduced. You. In addition, since there is no means for continuing discharge when the discharge state between the electrodes is normal, there is a problem that efficient machining cannot be performed.
- Japanese Patent Publication No. 3-119190 discloses that when an abnormality in the discharge state between the electrodes is detected, a reverse polarity discharge in which the workpiece is the negative electrode and the wire electrode is the positive electrode.
- a machining power supply device which performs machining and performs positive polarity electrical discharge machining using the workpiece as a positive electrode and the wire electrode as a negative electrode when the discharge state between the electrodes returns to normal. The purpose is to always increase the machining speed by using the electrolysis of the machining fluid by always performing reverse polarity electric discharge machining during abnormal electric discharge.
- the present invention has been made to solve the above-described problems, and has as its object to obtain a machining power supply device for a wire electric discharge machine capable of improving machining efficiency.
- a pulse voltage for inducing discharge is applied between a wire electrode and a workpiece, and the insulation between the poles is broken by the pulse voltage to cause a discharge.
- a discharge state discriminating means for discriminating a discharge state between the poles in a heating power supply device of a wire electric discharge machine for processing the workpiece by applying a machining pulse voltage between the poles after induction of
- the discharge state determining means determines that the discharge state between the electrodes is abnormal or open, the polarity of the discharge inducing pulse voltage is inverted with respect to the previous discharge inducing pulse voltage, and the discharge state determining means
- the applied voltage selecting means for setting the polarity of the discharge inducing pulse voltage to be the same as the previous discharge inducing pulse voltage when the discharge state between the electrodes is determined to be normal.
- the machining power supply device of the wire electric discharge machine according to the present invention, the machining pulse voltage is applied to the gap when the discharge state between the gaps is determined to be normal or abnormal by the discharge state determination unit. And a machining power supply control means for stopping application of the discharge inducing pulse voltage.
- the machining power supply device for a wire electric discharge machine supplies the machining pulse voltage between the poles when the discharge state discrimination means determines that the discharge state between the poles is normal.
- a machining power supply control means for stopping the application of the pulse voltage for inducing discharge is provided.
- the machining power supply device of the wire electric discharge machine includes an average voltage detecting means for detecting an average voltage between the electrodes, and suppresses a bias of the average voltage between the electrodes detected by the average voltage detecting means.
- a machining power supply control means for controlling the maximum application time of the discharge inducing pulse voltage is provided.
- machining efficiency can be improved and machining speed can be improved. It has the effect of Also, there is an effect that the contact of the workpiece can be prevented.
- FIG. 1 is a configuration diagram showing a machining power supply device of a wire electric discharge machine according to Embodiment 1 of the present invention.
- FIG. 2 is a configuration diagram of a machining power supply control circuit 1 of the machining power supply device of the wire electric discharge machine according to Embodiment 1 of the present invention.
- FIG. 3 is a diagram showing an example of an inter-electrode voltage waveform by the machining power supply device of the wire electric discharge machine according to Embodiment 1 of the present invention.
- FIG. 4 is a configuration diagram of the discharge state determination circuit 1a of FIG.
- FIG. 5 is an explanatory diagram showing a cycle of electric discharge machining.
- FIG. 6 is an explanatory diagram showing an example of a gap voltage and a gap current in the machining power supply device of the wire electric discharge machine according to Embodiment 1 of the present invention.
- FIG. 7 is a diagram showing an example of an experimental result comparing a machining power supply device of a wire electric discharge machine according to Embodiment 1 of the present invention with a machining power supply device of a conventional wire electric discharge machine.
- FIG. 8 is a diagram showing an example of an experimental result comparing a machining power supply device of a wire electric discharge machine according to Embodiment 1 of the present invention with a machining power supply device of a conventional wire electric discharge machine.
- FIG. 9 is a configuration diagram of a machining power supply control circuit 1 of the machining power supply device of the wire electric discharge machine according to Embodiment 2 of the present invention.
- FIG. 1 shows a machining electric power of a wire electric discharge machine according to Embodiment 1 of the present invention.
- FIG. 1 is a configuration diagram showing a power supply device, in which 1 is a machining power supply control circuit, 2 is a machining power supply circuit, 2a is a main discharge circuit, 2b is a discharge induction circuit, and Tr l and Tr l 'are machining power supply control circuits.
- the switching element that is turned on and off by the drive signal 0UT1 output from 1, Tr2, ⁇ , 2, is the switching element that turns on and off by the drive signal 0UT2 output from the processing power supply control circuit 1
- Tr3 is the processing power supply
- Tr4 is a switching element that is turned on and off by a drive signal 0UT4 output from the machining power supply control circuit 1
- VI and V2 are DC power supplies
- R0 R1 to R6 are resistors
- D1 to D12 are diodes
- S1 and S2 are detection input terminals
- ⁇ is a wire electrode
- W is a workpiece.
- the discharge inducing circuit 2b is a circuit for inducing a discharge between the electrodes
- the main discharging circuit 2a is a circuit for supplying a main discharging current for performing electric discharge machining.
- FIG. 1 is a configuration diagram of a machining power supply control circuit 1 of a machining power supply device of a wire electric discharge machine according to a first embodiment, and the same reference numerals as in FIG. 1 indicate the same or corresponding parts.
- la is a discharge state determination circuit
- 1 b is an applied voltage selection circuit.
- the machining power supply control circuit 1 detects a discharge by inputting a gap voltage between the workpiece W and the wire electrode E through the detection input terminals S1 and S2.
- the discharge state determination circuit 1a outputs the drive signals 0UT3 and 0UT4 to the main discharge circuit 2a based on the discharge detection signal, and selects the applied voltage.
- the circuit 1b outputs a drive signal of either ⁇ or 0UT2 to the discharge inducing circuit 2b.
- FIG. 3 is a diagram showing an example of a voltage waveform between contacts by the machining power supply device of the wire electric discharge machine according to Embodiment 1 of the present invention, wherein the same reference numerals as those in FIGS. The corresponding part is shown. In FIG.
- the ring is the gap voltage
- ⁇ is the reference voltage
- T 1 is the predetermined time during which the gap voltage VEW has risen higher than the reference voltage Vr since the start of voltage application during normal discharge
- PK is The pulse signal
- t is time.
- FIG. 4 is a configuration diagram of the discharge state determination circuit 1a of FIG. 2, and the same reference numerals as those in FIGS. 1 to 3 indicate the same or corresponding parts.
- 3 is a counter
- 4 is an amplifier that receives signals from the detection input terminals S1 and S2
- 5 is a comparator that compares the output of the amplifier 4 with the reference voltage Vr
- 6 is a D flip-flop.
- the flop, 7 is a logic operation circuit
- 0SC is an oscillator
- CLK is a reference clock
- EN is a pulse end signal.
- the pulse end signal EN is output at the end of the pulse, that is, at the time when the maximum time for applying the discharge induced voltage has elapsed.
- FIG. 1 when the switching elements Tr l and Tr l ′ or Tr 2 and ⁇ 2 ′ are turned on by the drive signal 0UT 1 or 0UT2 of the machining power supply control circuit 1, the voltage of the DC power supply V2 is connected to the wire via the resistor R0. Appears between the electrode ⁇ and the workpiece W. For example, an inter-electrode voltage waveform as shown in FIG. 3 is output.
- the amplifier 4 detects the gap voltage VEW by the detection input terminals S1 and S2, and the comparator 5 compares the result with the reference voltage Vr. Since the pulse signal PK is output, the pulse signal PK has a signal waveform as shown in FIG.
- the counter 3 performs a counting operation at a clock frequency of, for example, 1 MHZ, and the oscillator 0SC is connected to the switching element Tr 1 and the switching element Tr 1 in FIG.
- a trigger signal is output after a lapse of a predetermined time T1 from the output of the ON signal to the transistor Tr1 'or Tr2' or Tr2 and Tr2 '.
- the D flip-flop 6 outputs the state of the pulse signal ⁇ , which is the output of the comparator 5 at the point of the predetermined time T 1, as a signal Q 1.
- the logical operation circuit 7 determines whether or not the electrode voltage VEW has risen to the reference voltage Vr at the time of the predetermined time T1, and determines the discharge state between the electrode between the wire electrode E and the workpiece W.
- the gap voltage VEW has not risen to the reference voltage Vr at the time of the predetermined time T1, it is determined that the discharge state between the gaps is abnormal (Y1). If the gap voltage VEW has risen to the reference voltage Vr at the time of the predetermined time T1, and then falls to the reference voltage Vr or less, it is assumed that the electrode has been discharged stably for a sufficient time and the gap It is determined that the discharge state of is normal (Y2).
- drive signals 0UT3 and 0UT4 are set high to turn on switching elements Tr3 and Tr4 of main discharge circuit 2a, and drive signals 0UT1 and 0UT2 are set low. Turn off the switching elements Trl, Tr Tr2 and ⁇ ⁇ 2 '.
- the machining power supply control circuit 1 turns on the switching elements Trl and ⁇ ⁇ or Tr2 and ⁇ ⁇ ⁇ 2 'for the maximum time of the discharge induced voltage application, and pulses after the maximum time of the discharge induced voltage application.
- the end signal ⁇ is output. In this case, it is determined that the gap is open ( ⁇ 3).
- the discharge state determination circuit 1a can determine the abnormal discharge (Y1), the normal discharge (Y2), and the open (Y3) between the electrodes, and based on the determination result, the applied voltage selection circuit 1b. Use to select the polarity of the next applied voltage.
- FIG. 5 is an explanatory view showing a cycle of electric discharge machining.
- FIG. 5 (a) shows the case of abnormal electric discharge
- FIG. 5 (b) shows the case of normal electric discharge.
- FIG. 6 is an explanatory diagram showing an example of a gap voltage and a gap current in the machining power supply device of the wire electric discharge machine according to Embodiment 1 of the present invention, and is the same as FIGS. 1 to 4. Reference numerals indicate the same or corresponding parts.
- IEW is the inter-electrode current
- Tmax is the maximum time for applying the discharge induced voltage.
- Fig. 5 (a) when the discharge induced voltage is applied when the electric field strength between the poles is non-uniform as in state 1, the electric field strength is the lowest as in state 2 Discharge is induced at the place, and the insulation between the poles is gradually restored during the downtime as in state 3.
- FIGS. 5 and 8 are disclosed in the publication of Japanese Patent Publication No. 3-1-191012, which is a machining power supply device for a wire electric discharge machine according to Embodiment 1 of the present invention and a conventional technique.
- Fig. 7 shows an example of the experimental results comparing the machining power supply unit of a wire electric discharge machine with that of Fig. 7.
- the graph shows the change in machining speed with voltage.
- the state between the gaps is reset once by the reversed voltage, so that the time until the discharge is generated by the discharge induced voltage becomes too long, and the discharge The cycle becomes longer and the processing efficiency decreases. Therefore, by avoiding switching the output polarity of the voltage pulse (B, C, D of the gap voltage VEW in Fig. 6), the discharge induced state can be maintained in the optimum state, and the efficiency of the workpiece can be maintained. Removal processing becomes possible.
- the polarity is selected so as to increase the efficiency of machining based on the result of the determination of the discharge state between the electrodes as described above. This time depends on the state of discharge between the electrodes, and when compared with each other, there is a difference in the application time of the discharge induced voltage. However, the absolute value of the discharge induced voltage is the same, and the variation in the application time is almost negligible on average.Therefore, the average voltage between contacts can be regarded as almost 0 V. There is no problem with the resulting contact.
- FIG. 9 is a configuration diagram of a machining power supply control circuit 1 of a machining power supply device of a wire electric discharge machine according to a second embodiment of the present invention, and the same reference numerals as those in FIG. 2 of the first embodiment denote the same or corresponding components. The part is shown.
- lc is an inter-electrode average voltage detection circuit.
- the machining power supply control circuit 1 is provided with an inter-electrode average voltage detection circuit 1c, and controls the maximum time of application of the discharge induced voltage of one polarity based on an output signal from the inter-electrode average voltage detection device 1c. For example, the average gap voltage detector 1c outputs high when the average gap voltage is biased to the positive side, and outputs low when the average gap voltage is biased to the negative side.
- the output of the inter-electrode average voltage detector 1c is eighty, either reduce the maximum time for applying the positive side discharge induction voltage or increase the maximum time for applying the negative side discharge induction voltage, and then If the output of 1c is low, either increase the maximum time for applying the positive-side discharge induced voltage or decrease the maximum time for applying the negative-side discharge induced voltage.
- the average of the gap It is possible to suppress the voltage from being biased to one of the polarities, and thus to suppress the contact.
- Which polarity the maximum time of the discharge induced voltage application is controlled may be determined arbitrarily, or the polarity with the larger number of open state detections is detected, and the polarity side with the larger number of detections is automatically determined. It is also possible to control the maximum time of the application of the discharge-induced voltage on the polarity side by recognizing this.
- the machining power supply device of the wire electric discharge machine according to the present invention is particularly suitable for being used for highly productive wire electric discharge machining.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003523883A JP3835452B2 (ja) | 2002-06-12 | 2002-06-12 | ワイヤ放電加工機の加工電源装置 |
US10/415,749 US7109432B2 (en) | 2002-06-12 | 2002-06-12 | Electric power unit for machining of wire electric discharge machine |
PCT/JP2002/005848 WO2003106088A1 (ja) | 2002-06-12 | 2002-06-12 | ワイヤ放電加工機の加工電源装置 |
DE10297065T DE10297065T5 (de) | 2002-06-12 | 2002-06-12 | Elektrisches Netzteil für das Bearbeiten mit einer elektrischen Drahtentladungsmaschine |
CNB028027779A CN1272132C (zh) | 2002-06-12 | 2002-06-12 | 金属线放电加工机的加工电源装置 |
KR10-2003-7005974A KR100496399B1 (ko) | 2002-06-12 | 2002-06-12 | 와이어 방전가공기의 가공전원장치 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2002/005848 WO2003106088A1 (ja) | 2002-06-12 | 2002-06-12 | ワイヤ放電加工機の加工電源装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003106088A1 true WO2003106088A1 (ja) | 2003-12-24 |
Family
ID=29727346
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/005848 WO2003106088A1 (ja) | 2002-06-12 | 2002-06-12 | ワイヤ放電加工機の加工電源装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US7109432B2 (ja) |
JP (1) | JP3835452B2 (ja) |
KR (1) | KR100496399B1 (ja) |
CN (1) | CN1272132C (ja) |
DE (1) | DE10297065T5 (ja) |
WO (1) | WO2003106088A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012045662A (ja) * | 2010-08-26 | 2012-03-08 | Fanuc Ltd | 加工状態を検出するワイヤ放電加工機 |
US9744608B2 (en) | 2014-01-15 | 2017-08-29 | Fanuc Corporation | Wire electric discharge machine |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100393467C (zh) * | 2006-02-28 | 2008-06-11 | 苏州普光机电有限公司 | 多头数控电火花线切割机 |
DE112008003658B4 (de) * | 2008-01-31 | 2015-12-10 | Mitsubishi Electric Corp. | Elektrische Entladungsbearbeitungsvorrichtung |
CN101932404B (zh) * | 2008-01-31 | 2013-02-13 | 三菱电机株式会社 | 放电加工装置及放电加工方法 |
JP4648468B2 (ja) * | 2009-06-05 | 2011-03-09 | ファナック株式会社 | 加工状態判定機能を備えたワイヤカット放電加工機 |
DE112009005053B4 (de) * | 2009-07-07 | 2021-11-18 | Mitsubishi Electric Corporation | Drahterodierbearbeitungs-Vorrichtung |
WO2013080347A1 (ja) * | 2011-11-30 | 2013-06-06 | 三菱電機株式会社 | 放電加工機用電源装置 |
CN104039491B (zh) * | 2012-01-11 | 2015-11-25 | 三菱电机株式会社 | 线电极放电加工装置 |
TWI500466B (zh) | 2012-09-25 | 2015-09-21 | Ind Tech Res Inst | 調變式放電加工控制裝置與方法 |
JP6514163B2 (ja) * | 2016-09-01 | 2019-05-15 | ファナック株式会社 | ワイヤ放電加工機 |
CN106825797B (zh) * | 2017-04-01 | 2019-02-12 | 广东商鼎智能设备有限公司 | 电火花机床及其控制系统 |
CN110270724B (zh) * | 2018-03-15 | 2021-01-08 | 上海交通大学 | 一种基于场致射流表面感应放电的火花加工方法 |
Citations (2)
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JPS51108397A (ja) * | 1975-03-20 | 1976-09-25 | Inoue Japax Res | Hodenkakosochi |
JPH08300222A (ja) * | 1995-05-10 | 1996-11-19 | Fanuc Ltd | 放電加工方法及びその装置 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0219012A (ja) | 1988-07-07 | 1990-01-23 | Matsushita Electric Ind Co Ltd | 水晶振動子の製造方法 |
US5416290A (en) * | 1992-10-08 | 1995-05-16 | Mitsubishi Denki Kabushiki Kaisha | Electric discharge machine power supply circuit |
JP2914102B2 (ja) * | 1993-06-30 | 1999-06-28 | 三菱電機株式会社 | 放電加工機 |
JPH081438A (ja) | 1994-06-27 | 1996-01-09 | Fanuc Ltd | 放電加工方法及びその装置 |
JP3645957B2 (ja) * | 1995-12-28 | 2005-05-11 | 株式会社ソディック | 放電加工方法及び装置 |
JP3390652B2 (ja) * | 1998-02-10 | 2003-03-24 | 株式会社ソディック | 放電加工装置 |
JP3938044B2 (ja) * | 2000-06-06 | 2007-06-27 | 三菱電機株式会社 | 放電加工用電源装置 |
-
2002
- 2002-06-12 WO PCT/JP2002/005848 patent/WO2003106088A1/ja active IP Right Grant
- 2002-06-12 CN CNB028027779A patent/CN1272132C/zh not_active Expired - Fee Related
- 2002-06-12 JP JP2003523883A patent/JP3835452B2/ja not_active Expired - Fee Related
- 2002-06-12 KR KR10-2003-7005974A patent/KR100496399B1/ko not_active IP Right Cessation
- 2002-06-12 US US10/415,749 patent/US7109432B2/en not_active Expired - Fee Related
- 2002-06-12 DE DE10297065T patent/DE10297065T5/de not_active Ceased
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51108397A (ja) * | 1975-03-20 | 1976-09-25 | Inoue Japax Res | Hodenkakosochi |
JPH08300222A (ja) * | 1995-05-10 | 1996-11-19 | Fanuc Ltd | 放電加工方法及びその装置 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012045662A (ja) * | 2010-08-26 | 2012-03-08 | Fanuc Ltd | 加工状態を検出するワイヤ放電加工機 |
US8975554B2 (en) | 2010-08-26 | 2015-03-10 | Fanuc Corporation | Wire electric discharge machine capable of detecting machining state |
US9744608B2 (en) | 2014-01-15 | 2017-08-29 | Fanuc Corporation | Wire electric discharge machine |
Also Published As
Publication number | Publication date |
---|---|
KR20040028673A (ko) | 2004-04-03 |
JP3835452B2 (ja) | 2006-10-18 |
US20050127041A1 (en) | 2005-06-16 |
CN1524024A (zh) | 2004-08-25 |
DE10297065T5 (de) | 2004-11-18 |
JPWO2003106088A1 (ja) | 2005-10-27 |
US7109432B2 (en) | 2006-09-19 |
KR100496399B1 (ko) | 2005-06-17 |
CN1272132C (zh) | 2006-08-30 |
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