WO2007055164A1 - 電動モータのカーボンブラシおよびカーボンブラシの製造方法 - Google Patents
電動モータのカーボンブラシおよびカーボンブラシの製造方法 Download PDFInfo
- Publication number
- WO2007055164A1 WO2007055164A1 PCT/JP2006/322082 JP2006322082W WO2007055164A1 WO 2007055164 A1 WO2007055164 A1 WO 2007055164A1 JP 2006322082 W JP2006322082 W JP 2006322082W WO 2007055164 A1 WO2007055164 A1 WO 2007055164A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- brush
- graphite
- electric motor
- commutator
- mixed
- Prior art date
Links
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
- H01R39/00—Rotary current collectors, distributors or interrupters
- H01R39/02—Details for dynamo electric machines
- H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
- H01R39/20—Contacts for co-operation with commutator or slip-ring, e.g. contact brush characterised by the material thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R39/00—Rotary current collectors, distributors or interrupters
- H01R39/02—Details for dynamo electric machines
- H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
- H01R39/26—Solid sliding contacts, e.g. carbon brush
-
- 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
- H01R43/12—Manufacture of brushes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49009—Dynamoelectric machine
Definitions
- the present invention belongs to the technical field of a carbon brush of an electric motor for supplying power to a coil mounted on an armature of the electric motor and a method of manufacturing the carbon brush.
- an armature shaft of an armature having a coil mounted thereon is rotatably supported by a yoke provided with a permanent magnet, and a coil mounted on the armature shaft is mounted on the armature shaft.
- An electrically connected commutator is provided, and a brush connected to an external power source is brought into sliding contact with the commutator to supply power to the coil to excite the coil, thereby rotating the armature.
- the brush is made of carbon (graphite brush).
- a carbon film is formed on the sliding surface by air in the vicinity of the sliding contact portion with the commutator, air in pores contained in the brush, etc. It is known that the state of formation of the carbon film is strongly influenced by the use environment at the sliding contact between the brush and the commutator, that is, temperature, humidity, etc. If the ambient temperature in the contact area becomes high, the formation of an adequate carbon film will be lost! /, The sliding contact between the brush and the commutator will be deteriorated, and spark generation will increase. And the problem of poor durability arises.
- Patent Document 1 Japanese Patent Application Publication No. 2004-173486
- the brush is formed by pressing and sintering natural graphite and forming the brush, and then impregnating a liquid having a boiling point higher than the boiling point of water. And for this reason, if there is a problem that the number of processes increases and becomes complicated, it becomes difficult to carry out the impregnation process.
- an actuator may be configured using a plurality of electric motors, and in this case, the electric motor may be compacted and the voltage may be increased.
- the present invention was created with the object of solving the problems in view of the above situation, and the invention of claim 1 relates to a coil mounted on a rotor of an electric motor.
- the brush is a carbon brush of an electric motor which is formed using a raw material obtained by mixing man-made graphite with natural graphite.
- the invention of claim 2 is the carbon brush of the electric motor according to claim 1, wherein the artificial graphite is mixed at least 20 to 80 weight points.
- 50% by weight of the artificial graphite in claim 1 or 2 is It is a carbon brush of an electric motor that is mixed.
- the invention according to claim 4 is a method of manufacturing a brush for supplying power to a coil mounted on a rotor of an electric motor, wherein the brush mixes natural graphite with artificial graphite, and thereafter, the brush is pressed.
- This is a method of manufacturing a carbon brush of an electric motor characterized by being formed and sintered.
- FIG. 1 is a partial sectional side view of an electric motor.
- Figures 2 (A) and 2 (B) are graphs showing the change in the wear rate of the brush and the commutator, respectively, against the temperature change of the natural brush, and the wear rate of the brush and the commutator against the temperature change of the artificial brush. It is a graph which shows the change of.
- Figures 3 (A) and 3 (B) are graphs showing the change in brush wear rate based on the mixing ratio of the mixing brush measured with temperature, and the wear of the commutator based on the mixing ratio of the mixing brush It is a graph which measured change of speed to temperature change.
- FIG. 4 It is a flowchart figure explaining the formation procedure of a mixing brush.
- 1 is an electric motor (rotating electric machine) that functions as a fan motor configured in a high voltage compatible type, and a motor shaft (armature shaft) la of the electric motor 1 has a cylindrical shape with one end closed. It is supported by a bottom 2a of the yoke 2 via a bearing 2b, and a load is provided at a protruding tip end protruding outward from the yoke bottom 2a.
- the other end of the motor shaft la is supported by an end bracket 3 that covers the open end of the yoke 2 via a bearing 3a.
- the motor shaft la is positioned on the end bracket 3 side and the commutator 4 is integrally fitted outside, and a plurality of iron cores 5 are externally fitted to the yoke bottom 2 a side portion from the commutator 4.
- a plurality of coils 5a are mounted on the outer periphery.
- the plurality of conductive commutator pieces 4b in the circumferential direction are physically provided on the outer peripheral surface of the cylindrical fitting portion 4a which also has a resin material force.
- riser pieces 4c folded back to the outer diameter side are respectively formed, and by electrically connecting predetermined coils 5a to these riser pieces 4c, respectively, the rotor (armature) 6 It is formed.
- each brush holder 7 is provided with a bullet machine 8 for pressing the brush B in the inner diameter direction (axial direction of the motor shaft la), whereby each brush B is The tip end face is in sliding contact with the commutator piece 4b of the commutator 4 in a pressing manner.
- the coil 5a is energized through the commutator 4, and based on the energization, the coil! Based on 5a being excited!
- the armature 6 is set to rotate with respect to the magnetic field formed by the permanent magnet 2 c fixed to the inner peripheral surface of the yoke 2!
- a mixed brush B formed using a raw material in which natural graphite and artificial graphite are mixed is used for the electric motor 1, whereby an electric motor 1 is used.
- the atmosphere temperature at the sliding part between the mixing brush B and the commutator 4 (commutator piece 4b) is under normal temperature atmosphere, high temperature atmosphere! In order to achieve a stable commutation state, it is possible to improve the durability.
- both a natural brush NB whose raw material is natural graphite and a artificial brush AB whose raw material is artificial graphite are widely used.
- the present inventors focused on the shape, size, and electrical resistance of crystallites as the characteristics of natural graphite and artificial graphite, and made the brushes NB and AB formed of each graphite into the high-voltage compatible type described above. The commutation state when incorporated into the electric motor 1 was considered.
- a natural type or artificial type brush NB, AB is incorporated in the electric motor 1 to check the commutation state.
- a sliding portion between the natural type brush NB and the computer 4 and the artificial type brush AB and the commutator 4 The wear rate (mZh) of each of brushes NB, AB, and commutator 4 was measured at the sliding contact portion with each other.
- the wear rate is such that the electric motor 1 is driven under various conditions of a normal temperature atmosphere (the ambient air temperature at the sliding portion is around 20 ° C.) and a high temperature atmosphere (the ambient temperature at the sliding portion is around 80 ° C.) And the wear rate under each temperature condition was measured.
- the results are shown in the graphs of Fig. 2 (A) and (B) respectively.
- both brush NB and commutator 4 had wear under normal temperature atmosphere, and the wear rate of commutator 4 increased under high temperature atmosphere.
- the force with wear is both brush AB and commutator 4
- wear of brush AB is particularly fast, and the wear rate of brush AB is high temperature atmosphere It was confirmed to reduce.
- the sliding surface is carbo-
- the wear rate of the commutator 4 can be suppressed by the fact that the shape of the crystallite is scaly or scaly and the slipperiness is improved.
- the natural brush NB has a low specific resistance and thus has poor rectification and is considered to promote the wear of the brush NB.
- the carbon film is insufficient and the wear of the commutator 4 is promoted because the crystallites of natural graphite are large under high temperature atmosphere.
- the brush AB when considering the artificial brush AB, since the artificial graphite has smaller crystallites, it is more difficult to form a carbon film more than the natural brush NB under normal temperature atmosphere, and therefore, the brush AB It is believed to promote wear. On the other hand, in a high temperature atmosphere, a carbon film is easily formed, and it is considered that both the brush AB and the commutator 4 can be in a state in which the wear rate is suppressed.
- a carbon film is considered to be formed (adhered) to a commutator when the adsorption film such as water vapor on the surface of a fine single crystal of carbon reaches a critical temperature. Therefore, natural graphite having large crystallites has a small specific surface area of crystallites, and therefore, it is difficult to form a carbon film in a high temperature atmosphere. On the other hand, it is considered that in the case of man-made graphite, the specific surface area of crystallites with smaller crystallites becomes large, and the carbon film is easily formed.
- the inventors of the present invention have found that the commutated state may be deteriorated by using the mixed brush B in which both natural graphite and synthetic graphite are mixed. It was also judged that an excellent brush with good commutating condition could be formed as a brush of the assumed high voltage compatible electric motor.
- mixing brushes Bl, B2, B3 and B4 in which the mixing ratio is changed variously are prepared, and the mixing brushes Bl, B2, B3 and B4 are respectively applied to the electric motor 1 which is high voltage compatible type.
- the wear rates of the mixing brushes Bl, B2, B3, B4 and the commutator 4 were measured at the sliding contact between the mixing brushes Bl, B2, B3, B4 and the commutator 4, respectively.
- the wear rate is the electric motor 1 under each condition of a normal temperature atmosphere (the ambient temperature at the sliding portion is around 20 ° C) and a high temperature atmosphere (the ambient temperature at the sliding portion is around 80 ° C).
- the results are shown in the graph of Fig. 3 (A) and (B) respectively.
- the horizontal axis indicates the compounding ratio (weight percent, wt%) of the artificial graphite to the natural graphite
- the mixing brush B 1 contains 75 weight percent of the natural graphite and the artificial graphite.
- Mixed brush B 2 is formed by mixing 25 weight percent
- mixed brush B 2 is formed by mixing 60 weight percent of natural graphite and 40 weight percent of artificial graphite
- mixed brush B 3 is formed by mixing natural brush It is formed by mixing 50% by weight of graphite with 50% by weight of artificial graphite
- the mixed brush B4 is formed by mixing 25% by weight of natural graphite and 75% by weight of artificial graphite. It is
- the brush with an artificial graphite blending ratio of 0% by weight is a natural brush NB
- the brush with an artificial graphite blending ratio of 100% by weight is a artificial brush AB
- these brushes NB, AB The same measurements are shown respectively
- the worn state of the brush is high temperature under a normal temperature atmosphere by setting mixed brushes Bl, B2, B3 and B4 in which natural graphite and artificial graphite are mixed. It was confirmed that the wear rate was suppressed in both atmospheres. In particular, it was judged that the inhibition ratio of the brush B3 in which the compounding ratio of the artificial graphite to the natural graphite was 50% by weight was the best.
- the wear condition of the commutator 4 can be determined by using brushes Bl, B2, B3 and B4 in which natural graphite and artificial graphite are mixed.
- the wear of the force commutator 4 whose wear rate was confirmed to be suppressed in both of the lower cases was observed to show a marked decrease in the suppression rate particularly in a high temperature atmosphere.
- Brushes Bl, B2, B3 and B4, particularly preferably a mixture brush 50 mixed with 50% by weight leads to a high voltage-compatible electric motor 1 / /, from a normal temperature atmosphere to a high temperature atmosphere Wider, it is thought that it can be a well-rectified electric motor 1 in which the wear rate of the mixing brushes Bl, B2, B3, B4 and the commutator 4 is suppressed in the temperature range, and this makes the motor more durable. Judging that improvement is expected.
- natural graphite having a flake-like or scaly shape of crystallite and an average particle diameter of 20 to 200 ⁇ m, preferably 100 m, and a flake-like shape of crystallite
- a binder thermosetting resin such as phenolic resin or epoxy resin
- the above-mentioned kneaded product is dried, pulverized, and subjected to particle size separation to obtain graphite particles having a particle diameter of 10 to 400 m, preferably 200 m, and an additive is added thereto for film adjustment.
- the additive is a compound such as molybdenum (Mo), tungsten (W), silicon (Si), aluminum (A1) and the like, and the average particle diameter is 2 to 50 111, preferably about 10 m. Add 0.1 to 5 weight percent, preferably 2 weight percent, to the total weight of the sized graphite.
- electrolytic copper powder having an average particle diameter of 10 to 50 / ⁇ , preferably 30 / zm is added, but the electrolytic copper powder is used based on the total weight of the particle size-sorted graphite. , 1 to 50 percent by weight, and thoroughly mix these graphite particles, additives, and electrolytic copper powder.
- the mixture is transferred to a predetermined molding form, and 10 per square millimeter.
- the molded product is press-molded by applying a molding pressure of 0 to 300-euton, preferably 200-euton (NZ mm 2 ), and the molded product is subjected to temperature conditions of 200 to 800 ° C., preferably 500 ° C.
- a sintered body is obtained by firing for a time, and the mixed brush (B3) is formed by appropriately processing the sintered body into a shape.
- the procedure for forming the mixed brush is based on the procedure for forming a general-purpose graphite brush except for mixing natural graphite and artificial graphite as raw materials, and Therefore, it is possible to form a mixing brush that can be used for high-voltage electric motors that do not require special processes, but that can be maintained in a wide range of temperatures and in a rectified state. It has become.
- the external power supply is supplied to the coil 5a of the rotor 6 of the electric motor 1 via the commutator 4 as well as the brush B force.
- the sliding contact is made with the commutator.
- the brush B there is provided a mixed brush B using as a raw material a graphite obtained by mixing natural graphite and artificial graphite.
- the wear speed of the brush B or commutator 4 can be reduced under both normal temperature and high temperature conditions, and the commutation state can be improved even when adopted for the high voltage compatible electric motor 1. It is possible to improve the durability.
- the mixed brush B when forming the mixed brush B, the mixed brush B is formed based on the conventional general-purpose forming procedure only by mixing the natural graphite with the artificial graphite as a raw material. It is possible to provide the brush B that can cope with the high voltage electric motor 1 while avoiding the cost increase that can be performed without requiring any complicated processes.
- the present invention is, of course, not limited to the above embodiment, and even in the case where the mixing brush is applied to a general-purpose electric motor, it can be applied over a wide temperature range from normal temperature to high temperature. It is possible to improve the commutation state.
- the present invention is useful for a carbon brush of an electric motor for supplying power to a coil mounted on an armature of an electric motor and a method of manufacturing the carbon brush, and a raw material in which natural graphite is mixed with artificial graphite.
- the carbon brush using Even in the case of a high-voltage-compatible electric motor that can be formed in a molding process and carbon brushes made only of natural graphite, wear and deterioration of the rectifying property become remarkable, Since wear can be suppressed under a wide range of temperature conditions and the rectification state can be improved, durability can be improved.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Motor Or Generator Current Collectors (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200680039887.9A CN101297462B (zh) | 2005-11-10 | 2006-11-06 | 电动机的碳刷及碳刷的制造方法 |
US12/083,965 US8004143B2 (en) | 2005-11-10 | 2006-11-06 | Carbon brush of motor and method for producing the same |
JP2007544121A JP4925466B2 (ja) | 2005-11-10 | 2006-11-06 | カーボンブラシ、カーボンブラシの製造方法および電動モータ |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-326095 | 2005-11-10 | ||
JP2005326095 | 2005-11-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007055164A1 true WO2007055164A1 (ja) | 2007-05-18 |
Family
ID=38023167
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/322082 WO2007055164A1 (ja) | 2005-11-10 | 2006-11-06 | 電動モータのカーボンブラシおよびカーボンブラシの製造方法 |
Country Status (4)
Country | Link |
---|---|
US (1) | US8004143B2 (ja) |
JP (1) | JP4925466B2 (ja) |
CN (1) | CN101297462B (ja) |
WO (1) | WO2007055164A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009139263A (ja) * | 2007-12-07 | 2009-06-25 | Mitsuba Corp | ブラシのカーボン特定方法及びブラシ |
KR20160065834A (ko) | 2013-10-02 | 2016-06-09 | 도요탄소 가부시키가이샤 | 금속 탄소질 브러쉬 및 그 제조 방법 |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010002536A1 (de) * | 2010-03-03 | 2011-09-08 | Robert Bosch Gmbh | Verfahren zur Herstellung einer Kohlebürste in einem Kommutator |
CN102324681A (zh) * | 2011-06-02 | 2012-01-18 | 朱伟 | 电刷的导电减磨材料的生产方法 |
CN102263349A (zh) * | 2011-06-10 | 2011-11-30 | 陕西科技大学 | 一种电机用铜石墨复合材料电刷 |
CN103259150B (zh) * | 2012-02-16 | 2015-10-28 | 苏州东南碳制品有限公司 | 一种电动工具电机用电刷及其制备方法 |
CN102904137A (zh) * | 2012-10-26 | 2013-01-30 | 海门市通达碳业有限公司 | 一种用于制作新型电刷的组合物 |
CN105322410B (zh) * | 2014-07-10 | 2018-08-17 | 苏州东南碳制品有限公司 | 吸尘器电机用电刷的制备方法及由该方法制备的电刷 |
DE102015205735A1 (de) * | 2015-03-30 | 2016-10-06 | Schunk Hoffmann Carbon Technology Ag | Verwendung eines Kohlenstoffverbundmaterials zur Herstellung von elektrischen Kontaktkörpern für eine Kraftstoffpumpe sowie Kontaktkörper |
CN106299945B (zh) * | 2015-05-19 | 2018-12-18 | 苏州东南碳制品有限公司 | 一种座椅电机用碳刷 |
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JPH03103054A (ja) * | 1989-09-13 | 1991-04-30 | Nippon Steel Chem Co Ltd | 回転電動機用カーボンブラシ |
JP2004014294A (ja) * | 2002-06-06 | 2004-01-15 | Totan Kako Kk | カーボンブラシ |
JP2005102491A (ja) * | 2003-09-04 | 2005-04-14 | Totan Kako Kk | 電気機械用カーボンブラシ |
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JPH0783164B2 (ja) * | 1987-07-14 | 1995-09-06 | 大塚化学株式会社 | 印刷抵抗被膜 |
FR2706089B1 (fr) * | 1993-06-04 | 1995-07-28 | Lorraine Carbone | Procédé simplifié de fabrication de balais. |
DE4343736A1 (de) * | 1993-12-21 | 1995-06-22 | Mando Machine Co Ltd | Verfahren zur Herstellung einer Metallgraphitbürste |
JPH087648A (ja) * | 1994-06-22 | 1996-01-12 | Shin Etsu Polymer Co Ltd | 導電性樹脂組成物 |
WO2002001700A1 (fr) * | 2000-06-28 | 2002-01-03 | Totankako Co., Ltd. | Balai au carbone pour machine electrique |
EP1324438B1 (en) * | 2001-12-26 | 2007-08-01 | Tris, Inc. | Metal-graphite brush |
GB2389358B (en) * | 2002-06-06 | 2007-01-17 | Totankako Co Ltd | Carbon brush |
JP3719517B2 (ja) | 2002-10-28 | 2005-11-24 | アイシン精機株式会社 | 黒鉛質ブラシおよび黒鉛質ブラシを備えたモータ |
JP4647948B2 (ja) * | 2003-07-16 | 2011-03-09 | 三井化学株式会社 | 電気化学素子およびその製造方法 |
DE102004052026B4 (de) * | 2003-11-07 | 2015-08-27 | Totankako Co., Ltd. | Kollektor |
JP2005261153A (ja) * | 2004-03-15 | 2005-09-22 | Denso Corp | 車両用交流発電機 |
JP5064195B2 (ja) | 2007-12-07 | 2012-10-31 | 株式会社ミツバ | ブラシのカーボン特定方法 |
US20090255660A1 (en) * | 2008-04-10 | 2009-10-15 | Metal Matrix Cast Composites, Llc | High Thermal Conductivity Heat Sinks With Z-Axis Inserts |
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2006
- 2006-11-06 JP JP2007544121A patent/JP4925466B2/ja not_active Expired - Fee Related
- 2006-11-06 WO PCT/JP2006/322082 patent/WO2007055164A1/ja active Application Filing
- 2006-11-06 US US12/083,965 patent/US8004143B2/en not_active Expired - Fee Related
- 2006-11-06 CN CN200680039887.9A patent/CN101297462B/zh not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH03103054A (ja) * | 1989-09-13 | 1991-04-30 | Nippon Steel Chem Co Ltd | 回転電動機用カーボンブラシ |
JP2004014294A (ja) * | 2002-06-06 | 2004-01-15 | Totan Kako Kk | カーボンブラシ |
JP2005102491A (ja) * | 2003-09-04 | 2005-04-14 | Totan Kako Kk | 電気機械用カーボンブラシ |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009139263A (ja) * | 2007-12-07 | 2009-06-25 | Mitsuba Corp | ブラシのカーボン特定方法及びブラシ |
KR20160065834A (ko) | 2013-10-02 | 2016-06-09 | 도요탄소 가부시키가이샤 | 금속 탄소질 브러쉬 및 그 제조 방법 |
US10199789B2 (en) | 2013-10-02 | 2019-02-05 | Totan Kako Co. Ltd. | Metal-carbonaceous brush and method of manufacturing the same |
Also Published As
Publication number | Publication date |
---|---|
CN101297462B (zh) | 2012-07-25 |
CN101297462A (zh) | 2008-10-29 |
JP4925466B2 (ja) | 2012-04-25 |
JPWO2007055164A1 (ja) | 2009-04-30 |
US20090230814A1 (en) | 2009-09-17 |
US8004143B2 (en) | 2011-08-23 |
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