WO2012067178A1 - 電磁アクチュエータ - Google Patents
電磁アクチュエータ Download PDFInfo
- Publication number
- WO2012067178A1 WO2012067178A1 PCT/JP2011/076493 JP2011076493W WO2012067178A1 WO 2012067178 A1 WO2012067178 A1 WO 2012067178A1 JP 2011076493 W JP2011076493 W JP 2011076493W WO 2012067178 A1 WO2012067178 A1 WO 2012067178A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- iron core
- fixed iron
- magnetic flux
- electromagnetic actuator
- gap
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/16—Rectilinearly-movable armatures
- H01F7/1607—Armatures entering the winding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/081—Magnetic constructions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/081—Magnetic constructions
- H01F2007/086—Structural details of the armature
Definitions
- the present invention relates to an electromagnetic actuator used for driving various members by reciprocating a shaft with a solenoid.
- Such an electromagnetic actuator uses an electromagnetic force acting between a fixed iron core and a movable iron core arranged along a magnetic path formed by a solenoid coil as an attractive force.
- the end of the fixed iron core is cylindrical, the movable iron core is placed inside it, and the movable iron core is sucked into the fixed iron core by the magnetic force acting between the ends. Structure is adopted.
- Patent Document 1 a truncated cone surface (inclined surface) having a shape corresponding to each other is formed at opposing ends of the suction-side fixed iron core and the movable iron core.
- suction force works when the movable iron core is approaching from the outside, but once sucked, the cylindrical surfaces face each other, so the axial component force is It has been made in view of the fact that it is greatly reduced.
- a predetermined axial component force acts between the inclined surfaces even after the suction, it is said that a flat characteristic can be obtained by suppressing a decrease in the suction force with respect to the stroke movement distance.
- Patent Document 2 is a further improvement of the technique of Patent Document 1 and forms an inclined surface as an auxiliary suction surface while leaving a cylindrical surface in a portion where the fixed iron core and the movable iron core face each other.
- a suction force between the cylindrical surfaces acts in the first half of the stroke movement, and a suction force acts between the inclined surfaces in the second half. Therefore, it is said that a flat attraction force characteristic can be obtained while avoiding the disadvantage that the attraction efficiency with respect to the energization amount of the coil in the technique of Patent Document 1 is avoided.
- the suction efficiency is increased by compensating for the lowering of the suction force in the latter half of the stroke with the suction force between the inclined surfaces, and a flat suction force characteristic is ensured.
- these inclined surfaces are formed in a narrow space inside the cylindrical fixed iron core and the projected sectional area in the axial direction is small, it is not possible to sufficiently compensate for the reduction in suction force. Therefore, it has been difficult to obtain a large suction force and a flat suction force characteristic.
- an improvement in the suction force at the initial stroke is achieved, it is not sufficient.
- the present invention has been made in view of the above circumstances, and an object thereof is to provide an electromagnetic actuator having high performance that has a large suction force and linear suction force characteristics even if it is small.
- the electromagnetic actuator according to claim 1 includes a first and a second fixed iron cores arranged opposite to each other with a predetermined gap in the axial direction, and the vicinity of the gap along the axis.
- a movable iron core that is movably disposed, and a coil that applies a magnetic field to the two fixed iron cores and the movable iron core to form a magnetic path therein and drives the movable iron core toward the first fixed iron core.
- the movable iron core includes a magnetic flux guiding portion extending in an axial direction along a surface of the second fixed iron core, and a magnetic flux acting portion crossing the gap.
- the magnetic flux acting part of the movable iron core crosses the gap between the first and second fixed iron cores, the magnetic flux passing through the gap does not leak to the other.
- the electromagnetic force is generated through the magnetic flux acting part, so that the efficiency of generating the attractive force is improved and a large attractive force can be obtained.
- the first and second fixed iron cores face the magnetic flux acting part from the opposite sides, so that it is possible to secure a wide delivery surface by eliminating mutual interference, and the attraction force generation efficiency is also improved in this respect. .
- it is easy to change the shape of the magnetic flux line transfer surface and it is easy to achieve the purpose such as adjusting the balance of magnetic flux and force.
- a tapered concave portion or a convex portion is formed on an end surface facing the gap of the first fixed iron core, and the magnetic flux action is performed.
- the part has a shape along the end face.
- the tapered concave portion and the convex portion are opposed to each other in the fixed iron core and the movable iron core, and the suction force is distributed to the axial component and the radial component according to the taper angle. Since a certain amount of axial suction force is maintained even when the relative movement is performed, a change in the suction force with respect to the stroke can be suppressed, and a flat suction force characteristic can be obtained.
- An electromagnetic actuator according to a third aspect is the invention according to the first or second aspect, wherein the magnetic flux guiding portion is disposed along an outer peripheral surface of the second fixed iron core. .
- the invention according to claim 3 it is not necessary to provide a space for accommodating the magnetic flux guiding portion inside the second fixed iron core, and the manufacturing cost is reduced by omitting complicated processing, and the movable iron core is made thin.
- the cup shape reduces weight, opens the way to production by press molding from plate-like members, and reduces the load by reducing the spring load to return to the initial position, and the load itself by reducing friction This is also effective in improving vibration resistance (preventing chattering).
- the movable iron core is inserted through the first fixed iron core and the first fixed iron core. It is attached to the front-end
- the structure for supporting the shaft is simplified, and the clearance on the suction side, that is, the radial clearance between the first fixed iron core and the movable iron core can be reduced,
- the suction force can be improved in a wide range from the initial stroke to the middle stroke.
- an electromagnetic actuator that generates a large attractive force while being small and low in cost by forming a magnetic path with little magnetic flux leakage in the fixed iron core and the movable iron core.
- FIG. 1A The electromagnetic actuator according to the first embodiment of the present invention shown in FIG. 1A is, for example, for operating a fuel lever of a diesel internal combustion engine in a stop direction to automatically stop the engine, or for a four-wheel manual operation. It is used for automatically performing reverse select lock in a transmission vehicle.
- FIG. 1A (b) is a simplified model used when performing a magnetic path analysis by a computer as will be described later.
- the electromagnetic actuator includes a first fixed iron core 12 and a second fixed iron core 14 that are arranged to face each other via a predetermined gap 10 in the direction of the axis O, and is movable along the axis O in the vicinity of the gap 10.
- the movable iron core 16 disposed, the two fixed iron cores 12 and 14, and a coil 18 that applies a magnetic field to the movable iron core 16 to form a magnetic path therethrough and moves the movable iron core 16 along the axis O are provided. Yes.
- Each of these members is basically rotationally symmetric, that is, has a circular cross section and is accommodated in a cylindrical housing 20.
- the two fixed iron cores 12 and 14 have hook-like portions 22 and 24 on the upper and lower end surfaces, respectively, and the magnetic field generated by the coil 18 is guided through the hook-like portions 22 and 24 to enter the gap 10. Forms a high-density magnetic flux.
- the coil 18 When the coil 18 is energized, an attractive force is generated from the two fixed iron cores 12 and 14 to the movable iron core 16, but as will be described later, the first fixed iron core 12 has a larger attractive force so that it is movable when energized.
- the iron core 16 moves toward the first fixed iron core 12. That is, the first fixed iron core 12 mainly performs a suction action, and the second fixed iron core 14 performs a magnetic flux induction action.
- a through hole 26 is formed in the first fixed core 12 along the axis O, and a shaft 30 is movably installed through two bearings 28, 28. It is fixed to.
- the outer diameter of the second fixed iron core 14 is smaller than that of the first fixed iron core 12, so that a space for arranging a magnetic flux guiding portion 32 of the movable iron core 16 described later is provided between the inner surface of the coil 18. Is formed.
- the movable iron core 16 has a cup shape (bottomed cylindrical shape) from a cylindrical magnetic flux guiding portion 32 extending along the axis O direction and a magnetic flux acting portion 34 extending in a direction intersecting the axis O so as to cross the gap 10.
- the tip of the shaft 30 is inserted and fixed in a through hole 36 formed in the center of the magnetic flux acting part 34.
- the inner surface of the magnetic flux guiding portion 32 faces the outer surface of the second fixed iron core 14 with a small gap, and the direction in which most of the magnetic flux between the second fixed iron core 14 and the movable iron core 16 is substantially perpendicular to these surfaces. That is, it passes here along a direction perpendicular to the axis O.
- the first fixed iron core 12 faces only the magnetic flux acting portion 34 of the movable iron core 16, and the magnetic flux generated here has a component in the direction of the axis O, so that an attractive force in the direction of the axis O is generated. Therefore, a suction force toward the first fixed iron core 12 acts on the movable iron core 16.
- the end surface of the first fixed iron core 12 on the gap 10 side is formed with a concave portion 40 that is a tapered surface 38 whose side surface is widened toward the opening, and is a portion of the movable iron core 16 facing this.
- a certain magnetic flux acting part 34 is also formed in a shape corresponding to the concave part 40. That is, the magnetic flux acting part 34 in this example includes a first acting part 44 having a tapered surface 42 corresponding to the tapered surface 38 of the recessed part 40 and a second acting part having a flat surface 48 corresponding to the bottom surface 46 of the recessed part 40. 50.
- the magnetic flux guiding portion 32 is arranged on the outer peripheral side of the second fixed iron core 14, it is not necessary to process the second fixed iron core 14 into a cylindrical shape as compared with the case where it is arranged inside, Manufacturing cost can be reduced. Since the shaft 30 is supported in a cantilevered manner by a pair of bearings 28, 28 provided in the through hole 26 of the first fixed iron core 12, the bearing space is saved. Further, since both the pair of bearings 28 and 28 are installed in the through hole 26 of the first fixed iron core 12, that is, both the two bearings 28 and 28 are installed in the single through hole 26.
- FIG. 1B shows a case where a pair of bearings 28 and 28 are installed on both fixed iron cores 12 and 14. Further, as in the conventional example shown in FIG. 6, the magnetic flux guiding portion 32 may be arranged on the inner peripheral side of the second fixed iron core 14. In that case, the magnetic flux acting part 34 crosses the gap 10 by projecting outside the magnetic flux guiding part 32.
- FIGS. 2A to 2C are magnetic path analysis results by CAE (Computer Aided Engineering).
- the conventional electromagnetic actuator shown in FIG. 6 (a) is modeled as shown in FIG. 6 (b), with the electromagnetic actuator of the present embodiment being aligned with conditions such as iron core weight, applied current, and coil 18 specifications.
- the analysis results are shown in FIGS. 7A to 7B as comparative examples.
- FIGS. 2C and 7C show magnetic flux diagrams in the initial state, and the distance (air gap) between the flat surfaces of the movable iron core 16 and the first fixed iron core 12 is 2.8 mm.
- 2B and 7B show a state where the air gap is 1.4 mm in the middle of the stroke
- FIGS. 2C and 7C show a state where the air gap is 0.4 mm at the end of the stroke.
- the magnetic flux density between the tip of the peripheral wall of the first fixed iron core 12 and the tip of the movable iron core 16 is large, and the force acting on this part is mainly responsible for the attraction action.
- the magnetic flux between the flat surfaces increases, and the attractive force acting at this portion occupies a predetermined ratio, and in the final state, the attractive force acting between the flat surfaces is the main.
- the movable iron core 16 is disposed so as to cross the gap 10, and almost all of the magnetic flux generated between the first and second stationary iron cores 14 passes through the movable iron core 16. Therefore, the magnetic flux utilization efficiency is very high.
- the configuration of the prior art there is a region where the fixed iron cores directly face each other in the gap 10, and a magnetic flux that does not contribute to attraction is generated here, resulting in a decrease in efficiency. Therefore, in this embodiment, even if it is the same magnitude
- FIG. 3A shows the relationship between the air gap (stroke) and the attractive force obtained by the magnetic path analysis, and it can be seen that the present embodiment obtains a larger attractive force particularly in the initial range of the stroke.
- FIG. 3B is a graph showing the comparison between the first embodiment of FIG. 1A and the modification of FIG. 1B, and shows the relationship between the air gap (stroke) obtained by magnetic path analysis and the attractive force. .
- the pair of bearings 28 and 28 are both installed in the through hole 26 of the first fixed core 12, the pair of bearings 28 and 28 are connected to the first and second fixed cores 12. It can be seen that a large suction force of about 10% is obtained in a wide range from the initial stroke (air gap 2.8 mm) to the middle period (near air gap 1.4 mm), compared with the case where it is installed at 14.
- the first fixed iron core 12 and the second fixed iron core 14 face the opposite surfaces of the movable iron core 16. It will be. Therefore, the first fixed iron core 12 and the second fixed iron core 14 can use a wide area for transferring magnetic flux lines without having the same surface, and the attraction force is also improved in this respect. In addition, since there is no interference between the magnetic flux line transfer surfaces in this way, it is easy to change the shape of these surfaces, and in this embodiment, the first action part having a tapered surface is formed in the magnetic flux action part 34. Thus, the balance between the radial and axial magnetic fluxes and forces is adjusted, and as a result, as shown in FIG.
- the movable iron core 16 of the said embodiment is a comparatively thin cup shape, it can manufacture by press-molding a plate-shaped member besides the usual cutting process. Moreover, in this embodiment, the movable iron core 16 is cup-shaped, and when this moves, it is thought that an inner pressure increases and becomes resistance. In that case, an air vent hole may be provided at an appropriate location.
- FIG. 4A shows an electromagnetic actuator according to the second embodiment of the present invention
- FIG. 4B shows a simplified model thereof.
- a convex portion 52 is provided on the surface of the first fixed iron core 12 on the gap 10 side instead of the concave portion.
- a concave portion 54 having a shape corresponding to the convex portion 52 is formed on the facing surface of the movable iron core 16. Similar to the previous embodiment, the side surfaces of the convex portion 52 and the concave portion 54 are tapered surfaces 56 and 58 of a predetermined angle. Magnetic flux diagrams showing the operation of this embodiment are shown in FIGS. 5A to 5C. The relationship between the air gap (stroke) and the suction force is shown in FIG. 3A.
- the electromagnetic actuator of this embodiment also showed high magnetic flux utilization efficiency similar to that of the first embodiment, and showed a larger suction force and flat stroke-attraction force characteristics than the conventional example.
- the attraction force at the initial stage of movement with the weakest attraction force was improved by about 20% in the first embodiment and about 10% in the second embodiment compared to the conventional example. . Therefore, if it is desired to obtain a suction force equivalent to that of the conventional example, the weight of the movable iron core can be reduced by about 40%. Such weight reduction of the movable iron core leads to advantages such as improved vibration resistance and reduced load on the return spring.
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnets (AREA)
Abstract
Description
図1Aの(a)に示す、この発明の第1の実施形態の電磁アクチュエータは、例えば、ディーゼル内燃機関の燃料レバーを停止方向に作動させ、機関を自動停止させるために、または4輪のマニュアルトランスミッション車においてリバースセレクトロックを自動的に行なわせるために用いられるものである。なお、図1Aの(b)は後述するようにコンピュータによる磁路解析を行う際に用いた簡略化モデルである。
なお、シャフト30は、使用される状況に応じて第2の固定鉄心14に挿入するようにしてもよいし、場合によっては従来の場合のように両方の固定鉄心12、14に設置した軸受により支持するようにしてもよい。図1Aに示す第1の実施の形態の変形例として、両方の固定鉄心12、14に一対の軸受28、28を設置した場合を、図1Bに示す。
また、図6に示す従来例のように、磁束誘導部32を第2の固定鉄心14の内周側に配置してもよい。その場合は、磁束作用部34は磁束誘導部32の外側に張り出すことによりギャップ10を横切ることになる。
また、図3Bは、図1Aの第1の実施形態と図1Bの変形例とを比較して示すグラフであって、磁路解析によって得られたエアギャップ(ストローク)と吸引力の関係を示す。同図から分かるように、一対の軸受28、28を両方とも第1の固定鉄心12の貫通孔26に設置した場合の方が、一対の軸受28、28を第1および第2の固定鉄心12、14に設置した場合よりも、ストロークの初期(エアギャップ2.8mm)から中期(エアギャップ1.4mm付近)までの広い範囲において、約10%の大きな吸引力を得ていることが分かる。
10 ギャップ
12 第1の固定鉄心
14 第2の固定鉄心
16 可動鉄心
18 コイル
32 磁束誘導部
34 磁束作用部
Claims (4)
- 軸線方向に所定のギャップを介して対向配置された第1および第2の固定鉄心と、前記ギャップ近傍を前記軸線に沿って移動自在に配置された可動鉄心と、前記2つの固定鉄心および前記可動鉄心に磁界を及ぼしてこれらに磁路を形成し、前記可動鉄心を前記第1の固定鉄心に向けて駆動させるコイルとを備えた電磁アクチュエータにおいて、
前記可動鉄心は、前記第2の固定鉄心の表面に沿って軸方向に延びる磁束誘導部と、前記ギャップを横切る磁束作用部とを有することを特徴とする電磁アクチュエータ。 - 前記第1の固定鉄心の前記ギャップに臨む端部面には、テーパ状の凹部または凸部が形成され、前記磁束作用部は、前記端部面に沿った形状を有することを特徴とする請求項1に記載の電磁アクチュエータ。
- 前記磁束誘導部は、前記第2の固定鉄心の外周面に沿って配置されていることを特徴とする請求項1または請求項2に記載の電磁アクチュエータ。
- 前記可動鉄心は、前記第1の固定鉄心を挿通するとともに該第1の固定鉄心内部の少なくとも2点で軸受支持されたシャフトの先端に取り付けられていることを特徴とする請求項1から請求項3のいずれか1項に記載の電磁アクチュエータ。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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BR112013012121A BR112013012121A2 (pt) | 2010-11-17 | 2011-11-17 | atuador eletromagnético |
JP2012544293A JP6220127B2 (ja) | 2010-11-17 | 2011-11-17 | 電磁アクチュエータ |
Applications Claiming Priority (2)
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JP2010-257228 | 2010-11-17 | ||
JP2010257228 | 2010-11-17 |
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WO2012067178A1 true WO2012067178A1 (ja) | 2012-05-24 |
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PCT/JP2011/076493 WO2012067178A1 (ja) | 2010-11-17 | 2011-11-17 | 電磁アクチュエータ |
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JP (1) | JP6220127B2 (ja) |
BR (1) | BR112013012121A2 (ja) |
WO (1) | WO2012067178A1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014007230A1 (ja) * | 2012-07-05 | 2014-01-09 | 株式会社ミクニ | 電磁アクチュエータ |
CN105864488A (zh) * | 2016-04-22 | 2016-08-17 | 广东骏驰科技股份有限公司 | 油路开关电磁阀 |
US10126819B2 (en) | 2015-07-24 | 2018-11-13 | Alps Electric Co., Ltd. | Vibration generating device and manipulation feeling imparting input device using the vibration generating device |
US10496173B2 (en) | 2015-07-16 | 2019-12-03 | Alps Alpine Co., Ltd. | Manipulation feeling imparting input device |
WO2022181319A1 (ja) * | 2021-02-23 | 2022-09-01 | 日立Astemo株式会社 | ソレノイド、減衰力調整機構および減衰力調整式緩衝器 |
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JPH10321433A (ja) * | 1997-05-20 | 1998-12-04 | Sanmei Denki Kk | 自己保持型ソレノイド |
JP2005317939A (ja) * | 2004-03-31 | 2005-11-10 | Keihin Corp | リニアソレノイドバルブ |
JP2008098404A (ja) * | 2006-10-12 | 2008-04-24 | Hamanako Denso Co Ltd | ソレノイド装置 |
JP2009044924A (ja) * | 2007-08-10 | 2009-02-26 | Keihin Corp | 扁平型電磁アクチュエータ |
JP2011222799A (ja) * | 2010-04-12 | 2011-11-04 | Denso Corp | リニアソレノイド |
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JPS6111266A (ja) * | 1984-06-27 | 1986-01-18 | Matsushita Electric Works Ltd | 印字ヘツドの電磁石装置 |
JP2000277327A (ja) * | 1999-03-24 | 2000-10-06 | Denso Corp | リニアソレノイド及びそれを用いた電磁弁 |
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2011
- 2011-11-17 JP JP2012544293A patent/JP6220127B2/ja active Active
- 2011-11-17 BR BR112013012121A patent/BR112013012121A2/pt not_active IP Right Cessation
- 2011-11-17 WO PCT/JP2011/076493 patent/WO2012067178A1/ja active Application Filing
Patent Citations (5)
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JPH10321433A (ja) * | 1997-05-20 | 1998-12-04 | Sanmei Denki Kk | 自己保持型ソレノイド |
JP2005317939A (ja) * | 2004-03-31 | 2005-11-10 | Keihin Corp | リニアソレノイドバルブ |
JP2008098404A (ja) * | 2006-10-12 | 2008-04-24 | Hamanako Denso Co Ltd | ソレノイド装置 |
JP2009044924A (ja) * | 2007-08-10 | 2009-02-26 | Keihin Corp | 扁平型電磁アクチュエータ |
JP2011222799A (ja) * | 2010-04-12 | 2011-11-04 | Denso Corp | リニアソレノイド |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014007230A1 (ja) * | 2012-07-05 | 2014-01-09 | 株式会社ミクニ | 電磁アクチュエータ |
JP2014017282A (ja) * | 2012-07-05 | 2014-01-30 | Mikuni Corp | 電磁アクチュエータ |
CN104471655A (zh) * | 2012-07-05 | 2015-03-25 | 株式会社三国 | 电磁驱动器 |
US10496173B2 (en) | 2015-07-16 | 2019-12-03 | Alps Alpine Co., Ltd. | Manipulation feeling imparting input device |
US10126819B2 (en) | 2015-07-24 | 2018-11-13 | Alps Electric Co., Ltd. | Vibration generating device and manipulation feeling imparting input device using the vibration generating device |
CN105864488A (zh) * | 2016-04-22 | 2016-08-17 | 广东骏驰科技股份有限公司 | 油路开关电磁阀 |
WO2022181319A1 (ja) * | 2021-02-23 | 2022-09-01 | 日立Astemo株式会社 | ソレノイド、減衰力調整機構および減衰力調整式緩衝器 |
Also Published As
Publication number | Publication date |
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BR112013012121A2 (pt) | 2016-09-27 |
JPWO2012067178A1 (ja) | 2014-05-12 |
JP6220127B2 (ja) | 2017-10-25 |
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