WO2012065989A1 - Piezoelektrisches bauelement - Google Patents
Piezoelektrisches bauelement Download PDFInfo
- Publication number
- WO2012065989A1 WO2012065989A1 PCT/EP2011/070141 EP2011070141W WO2012065989A1 WO 2012065989 A1 WO2012065989 A1 WO 2012065989A1 EP 2011070141 W EP2011070141 W EP 2011070141W WO 2012065989 A1 WO2012065989 A1 WO 2012065989A1
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- WO
- WIPO (PCT)
- Prior art keywords
- electrodes
- primary
- region
- piezoelectric
- base body
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/87—Electrodes or interconnections, e.g. leads or terminals
- H10N30/871—Single-layered electrodes of multilayer piezoelectric or electrostrictive devices, e.g. internal electrodes
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/40—Piezoelectric or electrostrictive devices with electrical input and electrical output, e.g. functioning as transformers
Definitions
- the invention relates to a piezoelectric component, in particular ⁇ a transformer.
- the efficiency of a piezoelectric device depends on the values of the mechanical quality factor Q m and the coupling coefficient Ku.
- the coupling coefficient ⁇ ⁇ is a measure of the effectiveness of the conversion of electrical energy into mechanical energy and vice versa.
- the coupling coefficient K33 has the highest value. This corresponds to an arrangement in which the mechanical vibrations in the piezoelectric device along the length of the piezoelectric body are excited.
- the electrodes are arranged perpendicular to the longitudinal direction of the piezoelectric body.
- the piezoelectric material is polarized in the longitudinal direction of the base body.
- piezoelectric Transformer Using Inter-Digital Internal Electrodes Masafu- mi Katsuno, Yoshiaki Fuda, IEEE Ultrasonics Symposium 1998, pages 897 to 900.
- the manufacturing process is especially page 899
- the piezoelectric component comprises a plurality of ceramic layers which are arranged in the longitudinal direction of the piezoelectric main body and which are stacked one above the other perpendicular to the longitudinal direction of the main body structure of a piezoelectric transformer corresponds to and is therefore produced by the conventional methods the structure of a Dahlkeramikkonden- crystallizer. in particular, this manufacturing process has Before ⁇ parts with respect to the separation of the layers during the thermal treatment u nd compliance with the correct dimensions.
- the electrodes arranged on the surfaces of the layers together form a plurality of vertical electrodes, which are arranged at a right angle to the longitudinal direction of the piezoelectric main body.
- a problem with this construction is per ⁇ but the relatively high probability of a voltage between electrodes ⁇ rollover at the entrance and exit area of the transformer, which are arranged on the same surface of a layer. This problem occurs in particular This is due to the polarization and generally high voltages between the electrodes in the input and output regions. However, if the insulating areas are increased accordingly, the efficiency of the piezoelectric transformer decreases.
- a piezoelectric component which comprises a cuboid main body of piezoelectric material, first and second primary electrodes and first and second secondary electrodes.
- first and second primary electrodes At entge ⁇ gennewen longitudinal ends of the body an input area and an output area are arranged, which are mechanically coupled together.
- the cuboid base body has a multilayer structure.
- the arranged in the interior of the input area primary electrodes have according to the invention in a side facing the exit area portion at a greater distance to longitudinal side surfaces of the base body than in the bossbe ⁇ remote rich portion.
- the secondary electrodes arranged in the interior of the output region have a greater distance from the longitudinal side faces of the partial region facing the input region
- Base body as in a portion facing away from the entrance area.
- the breakdown voltage can be significantly reduced. borrowed, since there are larger insulating regions between the input region and the output region of the piezoelectric component.
- the Ef ⁇ ficiency of the piezoelectric element can be increased also, since the primary and secondary electrodes in partial areas that are located at the respective longitudinal ends of the base body, extend over the entire width of the piezoelectric body.
- the piezoelectric device can be easily and inexpensively manufactured, since conventional multilayer technologies are used.
- the piezoelectric device uses the direct as well as the inverse piezoelectric effect.
- the base body of piezoelectric material When an alternating voltage is applied to the first and second primary electrodes in the input region, the base body of piezoelectric material is set into mechanical oscillations. Since the input area is mechanically coupled to the output area, these mechanical vibrations are transmitted to the output area. Due to the direct piezoelectric effect, an output voltage can now be tapped in the output region at the first and second secondary electrodes.
- the piezoelectric Bauele ⁇ ment includes primary insulating regions, which, Zvi ⁇ rule the primary electrodes and the longitudinal side surfaces of the base body are arranged in the portion of the A ⁇ transition region which faces the exit region.
- the piezoelectric component also has secondary insulating regions, which are arranged in the Sectionbe ⁇ rich of the output region, which faces the input area, between the secondary electrodes and the longitudinal side surfaces of the base body. The primary and secondary insulating regions lead to an additional insulation on the side surfaces of the piezoelectric body and thus increase the breakdown voltage of the piezo ⁇ electrical component.
- the primary electrodes closest to the exit region are spaced from both longitudinal side surfaces of the main body.
- two separate primary insulating regions, which are each arranged between the primary electrodes and the longitudinal side surfaces of the base body arise.
- the nearest to the entrance of secondary electrodes are spaced from both longitudinal side surfaces of the base body, whereby two separate secondary isolation regions, which are respectively arranged between the secondary electrodes, and the length-side side surfaces of the base body are formed Kgs ⁇ NEN.
- an additional isolation region is disposed between the input region and the output region.
- the primary electrodes closest to the exit region are at a greater distance from the longitudinal side faces of the main body than the primary electrodes furthest from the exit region. Furthermore, they can be the entrance area nearest secondary electrodes have a greater distance from the longitudinal side faces of the main body than the farthest from the input area secondary electrodes.
- the piezoelectric device may be such as those sectors ⁇ taltet that the length of the primary electrodes decreases continuously in the direction of the output area from the entrance area.
- the primary electrodes depending ⁇ wells have a length which is the length of all those primary electrodes is less than or equal to, which are arranged closer to the entrance area.
- the secondary electrodes may each have a length that is less than or equal to the length of all those secondary electrodes that are located closer to the exit region.
- the Dahl Anlagenk- comprises structure of the piezoelectric element several parallel to ei ⁇ ner top of the body stacked qua ⁇ derförmige layers.
- the primary and secondary electrodes may be disposed between the layers substantially perpendicular to the longitudinal side surfaces of the base body.
- the second primary electrodes and the second secondary electrodes are the smallest spatial distance between the primary and the second have secondary electrodes, each arranged on different layers.
- the term "spatial distance" here preferably denotes the spatial distance parallel to the layers of the base body
- the first primary electrodes and the second primary electrodes it is possible for the first primary electrodes and the second primary electrodes to have the smallest spatial distance between the primary and the secondary electrodes , the spacing between electrodes are arranged on the same layer are respectively arranged on different layers., is thereby increased. This measure ⁇ acquisition leads to an improved isolation between the input and output areas of the piezoelectric element and thus increased to a breakdown voltage.
- electrodes of the first primary electrodes and of the second secondary electrodes are on a first layer and electrodes of the second primary electrodes and of the first secondary electrodes are on a second one
- the piezoelectric device comprising a first electrode and a second additional primary additional primary electrode which are located in attachments ⁇ ren the input range.
- the first to ⁇ additional primary electrode with the first primary electric ⁇ and the second additional primary electrode with the second primary electrodes are electrically coupled.
- the first and second primary electrodes may mesh in a comb-like manner.
- the piezoelectric component has a first and a second additional secondary electrode in the interior of the output region.
- the first additional Secondary electrode is electrically coupled to the first secondary electrode and the second additional secondary electrode with the two ⁇ th secondary electrodes.
- the first and second secondary electrodes may mesh in a comb-like manner.
- the piezoelectric Bauele ⁇ ment comprises a first and a second outer primary electrode, which are electrically coupled respectively to the first and second additional primary electrodes and which are disposed on opposite longitudinal side surfaces of the base body.
- the piezoelectric device having a first and a second outer secondary electrode which are each ⁇ wells electrically coupled to the first and second additional secondary electrode and the longitudinal side on ge ⁇ opposite side surfaces of the body are arranged.
- the special shape of the addi ⁇ tional primary and secondary electrodes, the outer primary and secondary electrodes can be positioned at a greater spatial distance from each other. This increases to ⁇ additionally the value of the withstand voltage of the piezoelectric element.
- the piezoelectric component of the base body to ⁇ additional insulating layers are deposited on the top and a bottom.
- the insulation is improved to the top and the bottom ⁇ side of the body and thus increases the flashover ⁇ voltage of the piezoelectric device.
- the piezoelectric material of the main body is polarized in the longitudinal direction of the main body. Adjacent portions of the piezoelectric ⁇ Ma terials between the first and the second primary and / or secondary electrodes are polarized in the opposite direction.
- Another aspect of the invention relates to a method of operating a piezoelectric device according to at least one of the embodiments described above.
- the piezoelectric device is excited to vibrate along the longitudinal direction of the main body.
- the frequency of this oscillation corresponds to a harmonic of the fundamental vibration of the body.
- the frequency is selected such that bone ⁇ ten in the harmonic result at positions where the first and second outer primary
- FIG. 1 shows a layer of a first embodiment of the piezoelectric component
- FIG. 2A shows a first layer of a second embodiment of the piezoelectric component
- FIG. 2B shows a second layer of the second embodiment of the piezoelectric component
- FIG. 3A shows a cross section of the first embodiment of the piezoelectric component
- FIG. 3B shows a cross section of the second embodiment of the piezoelectric component.
- the cuboid base body 1 has a Multi-layer structure, which comprises a plurality of parallelepiped parallel to the Obersei ⁇ te of the main body 1 stacked layers 11. The upper side of the main body 1 is defined over one of the largest surface sections of the cuboid base body 1.
- the piezoelectric device comprises first and second primary electrodes 4, 5 in the interior of decisionssbe ⁇ Reich 2 and first and second secondary electrodes 6, 7 inside the outlet portion 3, which are arranged in the multilayer structure.
- the primary and secondary electrodes 4, 5, 6, 7 are arranged between the layers 11 substantially perpendicular to the longitudinal side faces of the main body 1.
- the vertically superposed primary and secondary electrodes 4, 5, 6, 7 form vertical electrodes, which are aligned substantially perpendicular to the longitudinal direction of the piezoelectric body 1.
- the primary electrodes 4, 5 in a partial region facing the output region 3 have a greater distance from longitudinal side surfaces of the main body 1 than in a partial region facing away from the output region 3.
- the primary electrodes 4, 5 closest to the output region 3 are at a greater distance from the longitudinal side faces of the main body 1 than the primary electrodes 4, 5 farthest from the output region 3.
- the secondary electrodes 6, 7 also have an entrance region 2 facing portion a greater distance from the longitudinal side surfaces of the base body 1 as in a the input region 2 remote portion.
- the secondary electrodes 6, 7 closest to the input area 2 have a greater distance from the longitudinal sides. term side surfaces of the base body 1 than by the A ⁇ transition region 2 farthest secondary electrodes 6, 7.
- primary insulating regions 8 are formed, which in the partial region of the input area 2, which is the off ⁇ transition region faces 3, between the primary electrodes 4, 5 and the longitudinal side surfaces of the base body 1 are arranged.
- secondary insulating regions 9 are located between the secondary electrodes 6, 7 and the longitudinal side surfaces of the main body 1 in the partial region of the output region 3, which faces the input region 2.
- an additional insulating region 10 is formed between the input region 2 and the output region 3.
- the piezoelectric component comprises a first additional primary electrode 12 which is electrically coupled to the first primary electrodes 4 and a second additional primary electrode 13 which is electrically coupled to the second primary electrodes 5.
- the first and second additional primary electrodes are partially disposed inside the input area 2.
- the piezoelectric device comprising a first additional secondary electrode 14 which is electrically coupled to the first seconding ⁇ dary electrode 6 and a second additional secondary electrode 15 which is electrically coupled to the second se ⁇ ondary electrodes. 7
- the first additional secondary electrode 14 and the second additional secondary electrode 15 are located partially inside the output region 3.
- the first and second primary electrodes 4, 5 and the first and second secondary electrodes 6, 7 engage in a comb-like manner.
- the piezoelectric device comprises a first outer primary electrode 16 electrically coupled to the first additional primary electrode 12, a second outer primary electrode 17 electrically coupled to the second additional primary electrode 13, a first outer secondary electrode 18, which is electrically connected to the first zuslegili ⁇ chen secondary electrode 14 and a second outer secondary electrode 19 which is electrically connected to the second additional secondary electrode 15th
- the first and second outer primary electrodes 16, 17 and the first and second outer secondary electrodes 18, 19 are disposed on the longitudinal side surfaces of the main body 1.
- the piezoelectric material of the component is polarized in the longitudinal direction of the base body ⁇ 1, wherein the Polarized ⁇ tion of adjacent sections between the first and the second primary and / or secondary electrodes 4, 5, 6, 7 directed opposite.
- additional insulating layers may be applied on the upper side and an underside of the main body 1.
- the generated longitudinal vibration of the piezoelectric body 1 is transmitted to the output region 3 due to the mechanical coupling. Due to the direct piezoelectric effect, an output voltage is generated between the first and second outer secondary electrodes 18, 19. Also in the output region 3, the efficiency of the piezoelectric component is increased by the parallel-connected first and second secondary electrodes and by the utilization of the entire available width of the piezoelectric body 1.
- the value of the breakdown voltage is determined by the distance of the outer primary and secondary electrodes 16, 17, 18, 19 and the insulating regions 8, 9, 10 formed therebetween.
- the breakdown voltage is determined by technical standards which also limit the distance between the outer electrodes to, for example, 6 mm.
- Transforma ⁇ tors who work on a small power levels the same as isolating transformers which operate at a high performance level.
- larger isolation ranges result in decreasing efficiency of the piezoelectric transformer.
- the specially shaped primary insulating regions 8 and seconding ⁇ dary insulating regions 9 are formed in the embodiment of FIG. 1 These provide good insulation between the primary electrodes 4, 5 in the input area 2 and the secondary electrodes 6, 7 in the output area 3 safe. Since the outer primary electrodes 16, 17 and the outer secondary electrodes 18, 19 now have a greater spatial distance, the value of the breakdown voltage also increases. Despite the primary and secondary insulating regions 8, 9, a high efficiency of the piezoelectric element can be ensured, since the primary and seconding ⁇ dary electrodes 4, 5, 6, 7 from a position of the outer primary and secondary electrodes 16, 17, 18, 19 exploit the full width of the piezoelectric body 1 to the respective longitudinal ends of the piezoelectric body 1. The dimensions of the primary and secondary insulating regions 8, 9 are determined by the value of the breakdown voltage required by the piezoelectric transformer.
- FIG. 2A and 2B show a second embodiment of the piezoelectric component and illustrate an arrangement of electrodes in two adjacent layers 11.
- FIG. 2A shows that electrodes of the first primary electrodes 4 and the second secondary electrodes 7 are arranged on a first layer 11.
- Figure 2B illustrates that on a second layer 11, which is arranged directly adjacent to the first layer 11, the electrodes of the second Primae ⁇ ren electrodes 5 and the first secondary electrodes are arranged. 6 Due to this special arrangement, those electrodes which have the smallest spatial distance between the primary and secondary electrodes 4, 5, 6, 7, namely the second primary electrodes 5 and the second secondary electrodes 7, are each on different layers 11 the second primary electrodes 5 and the second secondary electrodes 7 are additionally separated from each other by the thickness of a layer 11. With By means of this measure, the value of the breakdown voltage of the piezoelectric component can be further increased.
- the thickness of a layer usually moves in a range of 10 to 50 ⁇ and is dependent on the distance of the primary and secondary electrodes 4, 5, 6, 7th
- FIG. 3A shows a cross section of the first embodiment of the piezoelectric component parallel to a side surface of the piezoelectric main body.
- Figure 3B shows the same view of the piezoelectric component for the second embodiment.
- the thickness of a layer 11 is located between the second primary electrodes 5 and the second secondary electrodes 7.
- the piezoelectric component when an alternating voltage is applied to the outer primary electrodes 16, 17, the piezoelectric component is excited to oscillate along the longitudinal direction of the main body 1.
- the frequency of the ⁇ ser oscillation corresponds to a harmonic of the fundamental oscillation of the base body 1.
- the frequency is selected so that there are nodes of the harmonic at positions at which the first and second outer primary and / or secondary electrodes 16, 17, 18 , 19 are arranged.
- the frequency beeinflus ⁇ sen the outer primary and / or secondary electrodes 16, 17, 18, 19 do not negatively the propagation of the mechanical vibration.
- the electrical energy can be very efficiently converted into a mechanical energy (and vice versa) the.
- the efficiency of the piezoelectric component is thereby additionally increased.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
- Dc-Dc Converters (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/878,509 US9379308B2 (en) | 2010-11-15 | 2011-11-15 | Piezoelectric component |
JP2013538233A JP5692765B2 (ja) | 2010-11-15 | 2011-11-15 | 圧電素子 |
DE112011103776.7T DE112011103776B4 (de) | 2010-11-15 | 2011-11-15 | Piezoelektrisches Bauelement und Verfahren zu seinem Betrieb |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102010051444.6 | 2010-11-15 | ||
DE102010051444 | 2010-11-15 |
Publications (1)
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WO2012065989A1 true WO2012065989A1 (de) | 2012-05-24 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/EP2011/070141 WO2012065989A1 (de) | 2010-11-15 | 2011-11-15 | Piezoelektrisches bauelement |
Country Status (4)
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US (1) | US9379308B2 (de) |
JP (1) | JP5692765B2 (de) |
DE (1) | DE112011103776B4 (de) |
WO (1) | WO2012065989A1 (de) |
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JP6806354B2 (ja) * | 2015-04-20 | 2021-01-06 | サムソン エレクトロ−メカニックス カンパニーリミテッド. | キャパシタ部品及びこれを備えた実装基板 |
KR102283082B1 (ko) * | 2015-11-09 | 2021-07-30 | 삼성전기주식회사 | 전원 공급 장치 |
Citations (1)
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DE102006049873A1 (de) * | 2006-10-23 | 2008-04-24 | Epcos Ag | Piezotransformator |
Family Cites Families (18)
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JPH06312505A (ja) | 1992-12-17 | 1994-11-08 | Seiko Epson Corp | 積層型圧電変位素子及びそれを用いたインクジェット記録ヘッド |
JPH07212177A (ja) * | 1994-01-14 | 1995-08-11 | Murata Mfg Co Ltd | 表面波フィルタ |
JPH10223939A (ja) * | 1997-02-07 | 1998-08-21 | Tokin Corp | 圧電トランス |
JPH11266040A (ja) | 1998-03-16 | 1999-09-28 | Tokin Corp | 圧電トランス |
JP2000150978A (ja) | 1998-11-06 | 2000-05-30 | Tokin Corp | 積層型圧電トランス |
CA2363659A1 (en) | 1999-02-16 | 2000-08-24 | Mitsui Chemicals, Inc. | Piezoelectric transformer |
JP2000294851A (ja) | 1999-04-06 | 2000-10-20 | Taiyo Yuden Co Ltd | 積層型圧電体電子デバイス |
JP2002324923A (ja) | 2001-04-25 | 2002-11-08 | Smk Corp | 圧電トランス |
US6972643B2 (en) * | 2001-06-29 | 2005-12-06 | Matsushita Electric Industrial Co., Ltd. | Surface acoustic wave filter |
JP3982267B2 (ja) * | 2002-01-16 | 2007-09-26 | 株式会社村田製作所 | 積層型圧電セラミック素子の製造方法 |
DE502005009831D1 (de) | 2004-08-13 | 2010-08-12 | Epcos Ag | Piezoelektrischer transformator |
DE102004058743A1 (de) * | 2004-12-06 | 2006-06-14 | Epcos Ag | Piezoelektrischer Transformator und Verfahren zu dessen Herstellung |
DE102005015600A1 (de) * | 2005-04-05 | 2006-10-12 | Epcos Ag | Piezoelektrischer Transformator |
DE102005047368A1 (de) * | 2005-10-04 | 2007-04-05 | Epcos Ag | Piezoelektrischer Transformator und Verfahren zu dessen Herstellung |
JP2007312164A (ja) * | 2006-05-19 | 2007-11-29 | Hitachi Ltd | 圧電薄膜共振器並びにそれを用いた高周波フィルタ及び高周波モジュール |
JP5189983B2 (ja) | 2006-08-23 | 2013-04-24 | 日本碍子株式会社 | 超音波モーター用圧電アクチュエータ素子 |
DE102006050064A1 (de) | 2006-10-24 | 2008-04-30 | Epcos Ag | Piezoelektrischer Transformator |
JP5409772B2 (ja) | 2009-03-25 | 2014-02-05 | 京セラ株式会社 | 積層型圧電素子およびそれを用いた噴射装置ならびに燃料噴射システム |
-
2011
- 2011-11-15 WO PCT/EP2011/070141 patent/WO2012065989A1/de active Application Filing
- 2011-11-15 US US13/878,509 patent/US9379308B2/en active Active
- 2011-11-15 DE DE112011103776.7T patent/DE112011103776B4/de active Active
- 2011-11-15 JP JP2013538233A patent/JP5692765B2/ja active Active
Patent Citations (1)
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DE102006049873A1 (de) * | 2006-10-23 | 2008-04-24 | Epcos Ag | Piezotransformator |
Non-Patent Citations (2)
Title |
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KATSUNO M ET AL: "Piezoelectric transformer using inter-digital internal electrodes", PROCEEDINGS OF THE 1998 IEEE ULTRASONICS SYMPOSIUM, PISCATAWAY, NJ, USA, vol. 1, 5 October 1998 (1998-10-05), pages 897 - 900, XP010330859, ISBN: 978-0-7803-4095-4, DOI: 10.1109/ULTSYM.1998.762288 * |
MASAFUMI KATSUNO, YOSHIAKI FUDA: "Piezoelectric Transformer Using Inter-Digital Internal Electrodes", IEEE ULTRASONICS SYMPOSIUM, 1998, pages 897 - 900 |
Also Published As
Publication number | Publication date |
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DE112011103776B4 (de) | 2019-07-04 |
JP5692765B2 (ja) | 2015-04-01 |
US9379308B2 (en) | 2016-06-28 |
US20130257227A1 (en) | 2013-10-03 |
JP2014501038A (ja) | 2014-01-16 |
DE112011103776A5 (de) | 2013-08-22 |
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