WO2012161310A1 - 加速度センサ - Google Patents
加速度センサ Download PDFInfo
- Publication number
- WO2012161310A1 WO2012161310A1 PCT/JP2012/063470 JP2012063470W WO2012161310A1 WO 2012161310 A1 WO2012161310 A1 WO 2012161310A1 JP 2012063470 W JP2012063470 W JP 2012063470W WO 2012161310 A1 WO2012161310 A1 WO 2012161310A1
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- WIPO (PCT)
- Prior art keywords
- vibrator
- circuit board
- acceleration sensor
- sensor housing
- region
- Prior art date
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- 230000001133 acceleration Effects 0.000 title claims abstract description 56
- 239000000853 adhesive Substances 0.000 claims abstract description 24
- 230000001070 adhesive effect Effects 0.000 claims abstract description 24
- 238000005452 bending Methods 0.000 claims abstract description 7
- 239000004020 conductor Substances 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims description 12
- 238000009413 insulation Methods 0.000 description 4
- 239000012790 adhesive layer Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 230000000644 propagated effect Effects 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/09—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by piezoelectric pick-up
- G01P15/0922—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by piezoelectric pick-up of the bending or flexing mode type
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
- G01P1/02—Housings
- G01P1/023—Housings for acceleration measuring devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/097—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by vibratory elements
Definitions
- the present invention is based on the priority claim of Japanese patent application: Japanese Patent Application No. 2011-117567 (filed on May 26, 2011), the entire contents of which are incorporated herein by reference. Shall.
- the present invention relates to an acceleration sensor for measuring or detecting vibration of an electronic device having a mechanical drive source.
- an HDD having a high capacity cost performance is used as an information storage device.
- HDD is composed of mechanical operating parts
- loss of information due to mechanical failure becomes a problem. Therefore, the vibration generated during the operation of the mechanically operating component is measured, and the vibration stored in the HDD before the failure of the HDD is protected by detecting the vibration characteristic of the failure sign.
- an acceleration sensor is generally used to detect vibration.
- the acceleration sensor used in such a system for information protection can withstand use in an environment with a lot of electrical noise, such as inside an electronic device, and has an impact resistance that exceeds the specifications of the device to be measured. A long-life and highly reliable acceleration sensor is required.
- a piezoelectric acceleration sensor converts a distortion of a piezoelectric body caused by external mechanical vibration into a voltage by the piezoelectric effect and outputs the voltage.
- a piezoelectric acceleration sensor there is a method in which electric charges are generated by bending vibration of a vibrator having a laminated structure of a piezoelectric ceramic plate and a metal support plate.
- This bending type piezoelectric acceleration sensor is divided into a cantilever type and a doubly supported beam type depending on the method of supporting the vibrator. Both ends of the vibrator are attached to the sensor housing serving as a support base with an adhesive or the like. Realized by fixing.
- Patent Document 1 a metal material is widely used in order to improve the electrical shielding effect of the electronic circuit housed in the sensor casing and the vibration propagation efficiency to the vibrator.
- the structure in which the vibrator is formed on the circuit board can electrically insulate the sensor housing from the vibrator (Patent Document 3). Furthermore, there is a structure in which the vibrator has a hollow circular diaphragm structure and is insulated from the metal casing by supporting the hollow portion with an insulating annular protrusion (Patent Document 4).
- the entire disclosures of Patent Documents 1 to 4 are incorporated herein by reference.
- the following analysis is given by the present invention.
- the conventional acceleration sensor has the following problems. First, if the thickness of the formed adhesive layer is thin, the surface of the support portion formed on the sensor casing and the unevenness of the adhesive surface of the vibrator are in partial contact with each other and have conductivity, making it impossible to ensure insulation. There's a problem. Furthermore, there is a problem that the vibration characteristics of the vibrator vary due to variations in the thickness of the adhesive layer.
- a conductive adhesive is generally used for bonding the substrate and the vibrator, but the joint part peels off due to the stress repeatedly generated in the support part due to the bending vibration of the vibrator and the impact acceleration applied from the outside, resulting in a long service life. There is a problem that it is difficult.
- the sensor output electrode is provided on the outer peripheral portion having a large vibration amplitude, and therefore the vibrator is caused by the variation of the solder amount or the solder position.
- the vibration characteristics of the slab changes and individual differences increase.
- the thickness of the insulating layer provided between the vibrator and the support base can be easily controlled, and the bonding strength between the circuit board and the joint between the vibrator and the support base for taking out an electric signal can be reduced.
- a highly reliable acceleration sensor having an increased support structure and realizing stable sensor characteristics and high durability against electrical noise and mechanical shock from outside is expected.
- an acceleration sensor includes a vibrator including a piezoelectric body, a circuit board that amplifies output charges of the piezoelectric body generated by bending vibration of the vibrator, and the vibrator.
- a piezoelectric acceleration sensor including a sensor housing made of a highly conductive material and containing the circuit board.
- the circuit board includes one or two extending regions formed so as to protrude from one side of the circuit board, which mechanically and electrically connects the circuit board and the vibrator.
- the sensor casing includes a support base that supports the vibrator, and the support base is formed with a recess. The recess is covered with the extension region of the circuit board, and the vibrator is fixedly supported by an insulating adhesive filled in a space formed by the recess and the extension region.
- FIG. 1 It is the top view and sectional view of an acceleration sensor concerning Example 1 of the present invention. It is a top view of the sensor housing
- the sensor housing further includes a step-shaped guide portion for positioning the circuit board.
- one or two or more through holes are provided in a contact portion between the extending region and the insulating adhesive filled in the space and the extending region.
- one or two or more depressions are formed in a contact portion between the extending region and the insulating adhesive filled in the space and the extending region.
- the vibrator has a laminated structure of the piezoelectric body and a metal support plate.
- the depth of the concave portion is three times or more of the larger value of the average central roughness of the surface of the metal support plate of the vibrator and the average central roughness of the bottom surface of the concave portion.
- the height of the guide portion from the bottom surface of the sensor housing is the same as the height of the support base from the bottom surface of the sensor housing.
- the insulating adhesive layer interposed between the vibrator and the support base can ensure insulation from the sensor housing, and insulation is provided by the gap (interval) between the support base surface on which the circuit board is installed and the bottom surface of the recess. Since the layer can be controlled to have a constant thickness, it is possible to realize an acceleration sensor having highly stable sensor characteristics that are highly resistant to external electric noise and have small variations in sensor characteristics.
- the insulating adhesive can integrally join the end of the vibrator and the circuit board through the gap between the opening of the concave portion formed in the support base and the vibrator, and the concave adhesive is filled with the insulating adhesive. Since the adhesion surface area formed by the two surfaces of the bottom surface and the wall surface of the recess is wider than that of the flat surface having no recess, the adhesive strength between the vibrator and the support base is also increased. Therefore, it is possible to prevent the vibrator, the circuit board, and the support base from being separated from each other due to impact acceleration applied from the outside, and it is possible to realize a long-life acceleration sensor by realizing high mechanical shock resistance.
- the first embodiment is a sensor housing 11 using a highly conductive material, a vibrator 100 having a laminated structure of a piezoelectric body 101 and a metal support plate 102, and a piezoelectric body generated by bending vibration of the vibrator 100.
- 101 is an acceleration sensor including a circuit board 10 that amplifies the output charge of 101.
- 1A is an overall plan view
- FIG. 1B is a cross-sectional view along BB ′ in FIG. 1A
- FIG. 1C is a cross-sectional view along CC ′ in FIG. Same in each figure).
- FIG. 2 is a plan view of the sensor housing excluding the circuit board 10 and the vibrator 100.
- the circuit board 10 has one side of the circuit board 10 that mechanically and electrically connects the circuit board 10 and the support portion of the vibrator 100 (FIG. 1A). Then, there are two extending regions 12 formed so as to protrude from both ends of the right side). In this embodiment, there are two, but one on one side may be used.
- the extension region 12 is configured to cover a later-described recess 15.
- An electronic component 17 is disposed on the circuit board 10.
- the sensor housing 11 includes a guide portion 13 for positioning and mounting the circuit board 10 and a support base 14 for supporting and fixing the vibrator 100.
- the guide portion 13 is a stepped portion provided inside the sensor housing 11. Positioning is possible by arranging the circuit board 10 at the stepped portion.
- the circuit board 10 is disposed on the guide portion 13 and the support base 14. Therefore, it is preferable that the guide portion 13 and the support base 14 have the same height from the bottom surface of the sensor housing 11.
- the support base 14 has a recess 15 that forms a predetermined space for filling the insulating adhesive around the vibrator 100 and the support base 14.
- the insulating adhesive 16 is filled in a space surrounded by the extended region 12 formed on the circuit board 10 and the recess 15 (and the vibrator 100) of the support base 14.
- the space is filled with the insulating adhesive 16, but other fixing materials may be used as long as they are insulating and fixable.
- the outer shape of the sensor casing 11 was 8.5 mm in length, 8.5 mm in width, and 3 mm in height.
- the guide portion 13 provided at the illustrated position has a width of 0.5 mm and a height of 1 mm.
- the support base 14 provided at the position shown in the figure has a width of 2 mm, a length of 1 mm, and a height of 1 mm, and a recess 15 having a width of 1.8 mm, a length of 0.8 mm, and a depth of 105 ⁇ m is formed on the support base.
- the external shape of the circuit board 10 is 7.5 mm long and 7.5 mm wide.
- two extending regions 12 having a length of 2 mm and a width of 1 mm are provided at two positions on the side of the circuit board.
- the external shape of the metal support plate 102 of the vibrator was 1.5 mm in width, 6.5 mm in length, and 100 ⁇ m in thickness.
- Table 1 shows the electrical noise resistance in a normalized charge amount obtained by normalizing the charge amount applied to the sensor housing from the outside with the charge amount that does not superimpose the electric noise due to the externally applied charge on the signal output of the acceleration sensor.
- Example 1 of the invention A comparison between Example 1 of the invention and a conventional acceleration sensor in which a vibrator and a sensor housing are electrically connected is shown.
- Example 1 of the present invention and the conventional sensor machine in the standardized impact acceleration in which the impact acceleration applied from the outside is standardized by the acceleration that caused the separation between the vibrator and the sensor housing in the conventional sensor Impact resistance.
- ⁇ Destruction occurrence rate 0% to less than 5%, ⁇ : 5% to less than 30%, ⁇ : 30% or more
- the acceleration sensor of Example 1 showed high electrical noise resistance and mechanical shock resistance.
- the extending region 12 formed on the circuit board 10 has a diameter of 0.1 mm in the illustrated position. Hole 20 was formed. In this embodiment, two are formed in each extended region, but the number is not limited to this. As a result, the insulating adhesive 16 is also filled into the through-holes 20, and the adhesive surface area of the circuit board 10 is increased to increase the adhesive strength.
- Table 3 shows the mechanical acceleration of the second embodiment of the present invention in the standardized impact acceleration in which the impact acceleration applied from the outside is normalized by the acceleration at which the transducer and the sensor housing are separated in the sensor of the first embodiment. Shows impact resistance.
- ⁇ Destruction occurrence rate 0% to less than 5%, ⁇ : 5% to less than 30%, ⁇ : 30% or more
- the acceleration sensor of Example 2 showed high mechanical impact resistance.
- a notch 30 is formed at the illustrated position of the extension region 12 formed in the circuit board 10. did. Since the rigidity of the base of the extended region 12 in which the notch 30 is formed is locally reduced, the circuit board 10 is deformed due to vibrations propagated from the signal cable and stress generated due to the deflection of the signal cable. Can be absorbed. This improves the resistance to mechanical noise such as vibration mixed from the outside.
- Example 4 the vibration acceleration propagated from the signal cable is normalized by the vibration acceleration propagated from the sensor cable when mechanical noise is superimposed on the sensor output in the acceleration sensor of the first embodiment.
- the mechanical noise tolerance of Example 3 is shown.
- the acceleration sensor of Example 4 exhibited high mechanical noise resistance.
- FIGS. 5A, 5B, and 5C the average center roughness X of the surface of the metal support plate 102 of the vibrator 100 in the structure of the first embodiment is used. Then, the larger value of the average center roughness Y of the bottom surface of the recess 15 is adopted, and the depth of the recess 15 is set such that the thickness of the insulating adhesive 16 is three times or more of the adopted value.
- FIG. 5C is a detailed schematic diagram of the enlarged portion indicated by a dotted line in FIG.
- FIG. 6 shows a case where the normalized thickness when the thickness of the insulating adhesive is normalized with the larger value of the average center roughness of the surface of the metal support plate and the bottom surface of the recess of the vibrator is changed.
- the change in impedance is shown.
- the normalized thickness is 3 or more, the impedance increases rapidly, indicating that good insulation can be secured.
- Such a configuration improves electrical noise resistance.
- the average center roughness is defined by JIS B 0601-1982.
- the acceleration sensor 1 according to the first embodiment for detecting a HDD failure sign is mounted on the target HDD 60, and the HDD 60 reaches a mechanical failure in an actual use environment.
- the vibration response was measured with the signal processing board 61.
- Table 5 shows the rate of occurrence of acceleration sensors that had electrical and mechanical problems before the measurement target HDD failed. 100 samples were prepared as the number of tests. For comparison, the same number of conventional acceleration sensors were evaluated.
- the failure occurrence rate of the acceleration sensor of this example is 1%, which is lower than the failure occurrence rate of 10% of the conventional acceleration sensor, and it can be seen that high reliability can be secured.
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Abstract
Description
本発明は、日本国特許出願:特願2011-117567号(2011年5月26日出願)の優先権主張に基づくものであり、同出願の全記載内容は引用をもって本書に組み込み記載されているものとする。
本発明は機械的駆動源を有する電子機器の振動を計測または検知するための加速度センサに関する。
従来の加速度センサにおいて以下に示す問題がある。第1に、形成された接着層の厚みが薄いとセンサ筐体に形成された支持部表面および振動子の接着面の凹凸が部分的に接触し導電性を有し、絶縁性を確保できなくなる問題がある。さらに、接着層の厚みばらつきにより振動子の振動特性がばらつく問題がある。
第1の実施例は、良導性材料を用いたセンサ筐体11と、圧電体101と金属支持板102との積層構造を有する振動子100と、振動子100の屈曲振動により発生する圧電体101の出力電荷を増幅する回路基板10と、を含む加速度センサである。図1(A)はその全体平面図、図1(B)は図1(A)のB-B’断面図、図(C)は図1(A)のC-C’断面図である(各図において同様)。図2は、回路基板10と振動子100を除いたセンサ筐体の平面図である。
第2の実施例は、図3(A)、(B)に示すように第1の実施例の構造に加え回路基板10に形成された延在領域12の図示位置に直径0.1mmの貫通孔20を形成した。本実施例では各延在領域に2つずつ形成したが、この個数に限定するわけではない。これにより、絶縁性接着剤16が該貫通孔20にも充填され、該回路基板10の接着表面積が増加することで接着強度が増加する。
尚、延在領域に形成した貫通穴の代わりに窪みを形成してもよい(図示せず)。該延在領域の接着表面積の増加による同様の効果を実現できる。
第3の実施例は、図4(A)、(B)に示すように第1の実施例の構造に加え回路基板10に形成された延在領域12の図示位置に切り欠き部30を形成した。該切り欠き部30が形成された該延在領域12の根元の剛性が局所的に低下することで、信号ケーブルから伝播した振動や信号ケーブルの撓みに伴い発生する応力による回路基板10の変形を吸収することができる。これにより外部から混入する振動などの機械的ノイズ耐性が向上する。
第4の実施例は、図5(A)、(B)、(C)に示すように、第1の実施例の構造において、振動子100の金属支持板102の表面の平均中心粗さXと、凹部15の底面の平均中心粗さYのうちの大きい方の値を採用し、その採用値の3倍以上の厚みを絶縁性接着剤16の厚みとするような凹部15の深さを有する。図5(C)は、図5(B)に点線で示した拡大部の詳細模式図である。
第5の実施例は、図7に示すようにHDDの故障予兆を検知する第1の実施例の加速度センサ1を対象HDD60に搭載し、実使用環境下で該HDD60が機械的故障に至るまで振動応答を信号処理基板61により計測した。
10 回路基板
11 センサ筐体
12 延在領域
13 ガイド部
14 支持台
15 凹部
16 絶縁性接着剤
17 電子部品
20 貫通孔
30 切り欠き部
60 HDD
61 信号処理基板
100 振動子
101 圧電体
102 金属支持板
Claims (8)
- 圧電体を含む振動子と、該振動子の屈曲振動により発生する該圧電体の出力電荷を増幅する回路基板と、該振動子及び該回路基板を収納する、良導性材料からなるセンサ筐体とを含む圧電型加速度センサであって、
該回路基板は、該回路基板と該振動子とを機械的且つ電気的に接続する、該回路基板の一辺から突出するように形成された1つ又は2つの延在領域を含み、
該センサ筐体は、該振動子を支持する支持台を含み、
該支持台は凹部を含み、該凹部を該回路基板の該延在領域が覆うように構成され、
該凹部と該延在領域とから形成される空間に充填した絶縁性接着剤により該振動子を固定支持したことを特徴とする、加速度センサ。 - 前記センサ筐体は、前記回路基板を位置決めする段差状のガイド部をさらに含む、請求項1に記載の加速度センサ。
- 前記延在領域の、前記空間に充填した前記絶縁性接着剤と該延在領域との接触部に1つ又は2つ以上の貫通孔を有する、請求項1又は2に記載の加速度センサ。
- 前記延在領域の、前記空間に充填した前記絶縁性接着剤と該延在領域との接触部に1つ又は2つ以上の窪みを有する、請求項1又は2に記載の加速度センサ。
- 前記延在領域の根元部分に切り欠き部を形成した、請求項1~4のいずれか一に記載の加速度センサ。
- 前記振動子は、前記圧電体と金属支持板との積層構造であることを特徴とする、請求項1~5のいずれか一に記載の加速度センサ。
- 前記振動子の前記金属支持板の表面の平均中心粗さと、前記凹部の底面の平均中心粗さのいずれか大きい方の値の3倍以上の前記凹部の深さを有する、請求項6に記載の加速度センサ。
- 前記ガイド部の前記センサ筐体の底面からの高さは前記支持台の前記センサ筐体の底面からの高さと同じである、請求項2~7のいずれか一に記載の加速度センサ。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2013516455A JP5967086B2 (ja) | 2011-05-26 | 2012-05-25 | 加速度センサ |
EP12789085.3A EP2717059B1 (en) | 2011-05-26 | 2012-05-25 | Acceleration sensor |
CN201280025887.9A CN103562731B (zh) | 2011-05-26 | 2012-05-25 | 加速度传感器 |
US14/119,283 US20140116137A1 (en) | 2011-05-26 | 2012-05-25 | Acceleration sensor |
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JP2011-117567 | 2011-05-26 | ||
JP2011117567 | 2011-05-26 |
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WO2012161310A1 true WO2012161310A1 (ja) | 2012-11-29 |
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PCT/JP2012/063470 WO2012161310A1 (ja) | 2011-05-26 | 2012-05-25 | 加速度センサ |
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US (1) | US20140116137A1 (ja) |
EP (1) | EP2717059B1 (ja) |
JP (1) | JP5967086B2 (ja) |
CN (1) | CN103562731B (ja) |
WO (1) | WO2012161310A1 (ja) |
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JP6793107B2 (ja) * | 2017-11-27 | 2020-12-02 | 日立オートモティブシステムズ株式会社 | 流量計 |
US10732195B2 (en) | 2018-01-26 | 2020-08-04 | Honeywell International Inc. | Vibrating beam accelerometer |
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2012
- 2012-05-25 CN CN201280025887.9A patent/CN103562731B/zh not_active Expired - Fee Related
- 2012-05-25 US US14/119,283 patent/US20140116137A1/en not_active Abandoned
- 2012-05-25 WO PCT/JP2012/063470 patent/WO2012161310A1/ja active Application Filing
- 2012-05-25 JP JP2013516455A patent/JP5967086B2/ja not_active Expired - Fee Related
- 2012-05-25 EP EP12789085.3A patent/EP2717059B1/en not_active Not-in-force
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Also Published As
Publication number | Publication date |
---|---|
EP2717059B1 (en) | 2015-11-18 |
JPWO2012161310A1 (ja) | 2014-07-31 |
EP2717059A1 (en) | 2014-04-09 |
US20140116137A1 (en) | 2014-05-01 |
CN103562731A (zh) | 2014-02-05 |
CN103562731B (zh) | 2016-01-06 |
JP5967086B2 (ja) | 2016-08-10 |
EP2717059A4 (en) | 2014-10-29 |
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