WO2005029013A1 - 振動センサ - Google Patents
振動センサ Download PDFInfo
- Publication number
- WO2005029013A1 WO2005029013A1 PCT/JP2004/013046 JP2004013046W WO2005029013A1 WO 2005029013 A1 WO2005029013 A1 WO 2005029013A1 JP 2004013046 W JP2004013046 W JP 2004013046W WO 2005029013 A1 WO2005029013 A1 WO 2005029013A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- vibration sensor
- vibration
- electrode
- vibrating
- vibrating membrane
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
Definitions
- the present invention relates to a capacitive vibration sensor, and more particularly to a vibration sensor capable of outputting, as a vibration signal, a change in capacitance between a fixed electrode and a vibrating electrode disposed opposite to the fixed electrode.
- a vibration sensor has been proposed in which a slit is provided in a plate member to form a vibrating membrane portion that is subjected to vibration displacement, and a weight is attached to the vibrating membrane portion (example For example, refer to Patent Document 2).
- the slit of this vibration sensor is composed of a slit formed in an annular shape and a radial slit which also forces the center point force outward.
- Patent Document 1 Japanese Patent Application Laid-Open No. 59-79700
- Patent Document 2 Japanese Patent Application Laid-Open No. 9 49856
- the present invention has been made in view of the above problems, and its object is to provide an electrostatic capacitance type vibration sensor for detecting minute vibration, which is thinner and has excellent impact resistance. vibration The point is to realize a sensor.
- a characterizing feature of the vibration sensor according to the present invention is that a change in electrostatic capacitance between a fixed electrode and a vibrating electrode disposed opposite to the fixed electrode is a vibration signal.
- the vibration electrode is provided with a slit in the same plate member, and a vibrating film portion on the central side which is vibrated and displaced only by its own weight, and a fixed portion positioned on the peripheral side, An elastic support portion connecting the vibrating membrane portion and the fixing portion is formed.
- the elastic supporting portion formed by providing the slit in the vibrating electrode is provided with a function as a panel, and the vibrating membrane portion on the center side is vibrated and displaced only by its own weight.
- the desired amplitude can be obtained without providing a weight.
- the impact resistance can also be improved.
- the slit of the vibrating electrode serves as a shock absorbing material, and the shock can be mitigated. As a result, it is possible to obtain a vibration sensor which is thinner and has excellent impact resistance without requiring a space for providing a weight.
- the plate member is made of any of stainless steel, tandasten, Ti-Cu alloy, and Be-Cu alloy.
- a material having a high specific gravity and a high bending strength is used instead of the conventional PET and PPS, such as stainless steel (SUS 304) having a specific gravity of 7.8 and tungsten having a specific gravity of 16 Desired amplitude can be obtained only by the weight of the vibrating membrane portion, and impact resistance can be improved. Therefore, by configuring as in the present characteristic configuration, a practical embodiment of a vibration sensor excellent in impact resistance can be obtained while obtaining a good output signal.
- the plate member has a plate thickness of 30 ⁇ m to 50 ⁇ m.
- the plate thickness is set to be thicker than the film thickness (for example, about 4 m from the conventional vibrating electrode) (for example, about 4 m), the bending strength and impact resistance of the plate member are improved. Can do it.
- the weight of the vibrating membrane can be set to a weight that can obtain a good output signal.
- the vibrating membrane is formed in a circular shape, and the elastic supporting portion has an arc shape in which one end is connected to the vibrating membrane and the other end is connected to the fixed portion. A plurality of narrow bodies are arranged at equal intervals along the outer periphery of the vibrating membrane, and are wound around.
- the elastic support portion can be formed with a simple structure, and vibration is caused.
- the electrode can be easily manufactured.
- the arc-shaped narrow bodies are arranged at equal intervals on the outer periphery of the vibrating membrane, the load is uniformly applied to the elastic support, and the vibrating membrane is displaced in parallel. , Stable output is obtained.
- the displacement of the vibrating membrane portion can be increased, and the sensor output can be increased.
- the elastic support portion is formed in a beam-like body that connects one portion on the outer peripheral side of the vibrating membrane portion and the fixing portion adjacent to the portion.
- the vibrating membrane since the vibrating membrane has a one-point support (cantilever) structure, the fixed electrode and the vibrating membrane do not come in surface contact with each other when the vibrating membrane is displaced.
- the electret member is formed on the surface of the fixed electrode facing the vibrating electrode, the diaphragm portion is easily attracted to the electret member due to the electric charge of the electret member.
- the adsorption of the vibrating membrane to the electret member can be effectively prevented.
- the vibration sensor 1 outputs, as a vibration signal, a change in capacitance between the fixed electrode 2 and the vibrating electrode 3 disposed to face the fixed electrode 2.
- the vibration electrode 3 has a slit 3a in the same plate member, and a vibrating film portion 3b on the center side that is vibrated and displaced only by its own weight, and a fixed portion 3c located on the peripheral side.
- An elastic support portion 3d is formed to connect the vibrating membrane portion 3b and the fixed portion 3c.
- an operational amplifier is provided as the amplifier circuit 11 on the output side. Also, The light can be applied to both the front type and the back type.
- the fixed electrode 2 is constituted by the bottom portion of a case member 7 having a U-shaped cross section in which the electret member 4 is formed on the inner surface. It is done. Then, a ring-shaped spacer 6, a vibrating electrode 3 and a vibrating electrode ring 5 are sequentially stacked on the bottom of the case member 7, then the circuit board 8 is covered and fixed to the case member 7 to shake it. It becomes a structure that assembles a sensor.
- the fixed electrode 2 is connected to the circuit board 8 through the case member 7, and the vibrating electrode 3 is connected to the circuit board 8 through the vibrating electrode ring 5.
- the back type vibration sensor 1 is a fixed electrode 2 with a vibrating electrode ring 5, a vibrating electrode 3, a spacer 6 and an electret member 4 at the bottom of the case member 7.
- the circuit board 8 is closed and fixed to the case member 7 to assemble a vibration sensor.
- the fixed electrode 2 is fixedly supported by sandwiching the surrounding portion by a back electrode holder 10 made of an insulator.
- the fixed electrode 2 is connected to the circuit board 8 through the gate ring 9.
- the vibrating electrode 3 is connected to the circuit board 8 through the vibrating electrode ring 5 and the case member 7.
- the thickness of the vibrating electrode ring 5 is set thin in both the front type and the back type in order to improve the impact resistance, which contributes to the thinning of the vibration sensor 1. Further, the amplifier circuit 11 may be built in the circuit board 8 or may not be built in.
- the vibrating electrode 3 is made of, for example, SUS304 (stainless steel), and its plate thickness is set to 30 ⁇ m to 50 m.
- the vibrating electrode 3 is provided with slits in the same plate member to form the vibrating film portion 3b, the fixing portion 3c, and the elastic support portion 3d, it can be easily formed by press processing, etching, or the like.
- the vibrating film portion 3 b is formed in a circular shape, and its area is set so as to have a weight that can detect a vibration well and obtain a desired amplitude.
- the elastic supporting portion 3d is formed in an arc-shaped narrow body in which one end side is connected to the vibrating membrane portion 3b and the other end side is connected to the fixing portion 3c, and plural elastic supporting portions 3d are equally spaced along the outer periphery of the vibrating membrane portion 3b. It is arranged.
- the number of elastic support portions 3 d is three in consideration of the stability of the vibration sensor 1 and the like, but the number may be arbitrarily configured.
- the vibration sensor 1 of the present embodiment is subjected to one drop test for each of six areas in a state of being fixed to the housing from a height of 1.5 m, and the vibration sensor 1, in particular, the vibration electrode 3 is I have confirmed that it is not broken.
- the film thickness of the vibrating electrode 3 set to about ⁇ 4 is preferably 30 ⁇ m, and the film thickness of the vibrating electrode 3 set to about ⁇ 6 is preferably 50 / z m.
- the film thickness of the vibrating electrode 3 with a diameter of about ⁇ 4 may be set to 50 ⁇ m, but the output signal strength is lower.
- a vibrating electrode 3 set to a thickness of 30 ⁇ m and a diameter of about ⁇ 4, and a thickness of 50 ⁇ m, a diameter of about
- the output voltage under the conditions of resonance frequency (Hz) and low frequency vibration (2.5 Hz and 1. 75 Hz) Is shown.
- the amplification stage gain of the amplification circuit 11 is set to 16, and the power supply voltage is set to 3V.
- the vibrating membrane portion 3b is formed in a circular shape, and an elastic supporting portion 3d of a beam-like body connecting one portion on the outer peripheral side of the vibrating membrane portion 3b and the fixed portion 3c adjacent to the portion is formed.
- an elastic supporting portion 3d of a beam-like body connecting one portion on the outer peripheral side of the vibrating membrane portion 3b and the fixed portion 3c adjacent to the portion is formed.
- a circular slit 3a is formed, and furthermore, a linear slit 3a is formed inwardly at each of both ends thereof.
- the elastic support portion 3d is formed in one place to form a cantilever structure, the vibrating membrane portion 3b is not displaced in parallel, and the adsorption of the vibrating electrode 3 to the electret member 4 is prevented.
- FIG. 1 A third embodiment of the present invention will be described based on FIG.
- the vibrating film portion 3b is formed in a circular shape, and a beam-like body connecting one position on the outer peripheral side of the vibrating film portion 3b and the fixed portion 3c adjacent to the position Form the elastic support 3d.
- a circular slit 3a is formed except for one part. Therefore, the shape of the slit 3a can be simplified, and the vibration sensor 1 according to the present invention can be realized with a simpler structure.
- the plate member is made of SUS304 (stainless steel), such as tungsten, Ti Cu alloy, Be Cu alloy, etc., which has a large specific gravity such as bending strength. It may be made of a strong material.
- FIG. 1 is a cross-sectional view showing an embodiment of a vibration sensor according to the present invention.
- FIG. 2 A schematic view showing an example of a vibrating electrode of a vibration sensor according to the present invention
- FIG. 3 A wiring diagram showing a vibration sensor and peripheral circuits according to the present invention
- FIG. 4 A diagram showing an example of the resonant frequency and the output voltage of the vibration sensor according to the present invention
- FIG. 5 A schematic view showing a modified example of the vibrating electrode of the vibration sensor according to the present invention
- FIG. 6 A schematic view showing a modified example of the vibrating electrode of the vibration sensor according to the present invention
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/572,424 US20070107521A1 (en) | 2003-09-22 | 2004-09-08 | Vibration sensor |
EP04787729A EP1666855A1 (en) | 2003-09-22 | 2004-09-08 | Vibration sensor |
CA002529136A CA2529136A1 (en) | 2003-09-22 | 2004-09-08 | Vibration sensor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003329877A JP2005098726A (ja) | 2003-09-22 | 2003-09-22 | 振動センサ |
JP2003-329877 | 2003-09-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005029013A1 true WO2005029013A1 (ja) | 2005-03-31 |
Family
ID=34372979
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/013046 WO2005029013A1 (ja) | 2003-09-22 | 2004-09-08 | 振動センサ |
Country Status (8)
Country | Link |
---|---|
US (1) | US20070107521A1 (ja) |
EP (1) | EP1666855A1 (ja) |
JP (1) | JP2005098726A (ja) |
KR (1) | KR20050029686A (ja) |
CN (1) | CN1853090A (ja) |
CA (1) | CA2529136A1 (ja) |
TW (1) | TWI238245B (ja) |
WO (1) | WO2005029013A1 (ja) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005098727A (ja) * | 2003-09-22 | 2005-04-14 | Hosiden Corp | 振動センサ |
CN101294844B (zh) * | 2007-04-23 | 2015-07-22 | 成都锐华光电技术有限责任公司 | 弯曲压电式氧化锌纳米棒微电机(mems)振动传感器 |
US7841234B2 (en) * | 2007-07-30 | 2010-11-30 | Chevron U.S.A. Inc. | System and method for sensing pressure using an inductive element |
JP5852390B2 (ja) * | 2011-01-25 | 2016-02-03 | 日本電波工業株式会社 | 振動検出装置 |
CN103547895B (zh) | 2011-02-07 | 2016-08-24 | 离子地球物理学公司 | 用于感测水下信号的方法和设备 |
CN102538949B (zh) * | 2011-12-13 | 2013-08-21 | 江苏大学 | 一种基于石墨烯片层的纳机电谐振式传感器及其制作方法 |
CN108362371A (zh) * | 2018-04-08 | 2018-08-03 | 东莞泉声电子有限公司 | 振动膜结构及振动检测传感器 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5979700A (ja) * | 1982-10-28 | 1984-05-08 | Katsuo Motoi | 振動検知装置 |
JPS61102828U (ja) * | 1984-12-10 | 1986-06-30 | ||
JPH0432774A (ja) * | 1990-05-30 | 1992-02-04 | Copal Co Ltd | 加速度センサ |
JPH06230023A (ja) * | 1992-03-04 | 1994-08-19 | Omron Corp | 変位検出センサ |
WO1995035485A1 (fr) * | 1994-06-20 | 1995-12-28 | Sony Corporation | Capteur de vibrations et instrument de navigation |
JPH1026554A (ja) * | 1996-07-12 | 1998-01-27 | Omron Corp | 感震器およびガスメータ |
JP2000346867A (ja) * | 1999-06-02 | 2000-12-15 | Topre Corp | 加速度センサ |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH642461A5 (fr) * | 1981-07-02 | 1984-04-13 | Centre Electron Horloger | Accelerometre. |
US4516428A (en) * | 1982-10-28 | 1985-05-14 | Pan Communications, Inc. | Acceleration vibration detector |
US4694687A (en) * | 1986-04-17 | 1987-09-22 | Vericom Corporation | Vehicle performance analyzer |
US4932258A (en) * | 1988-06-29 | 1990-06-12 | Sundstrand Data Control, Inc. | Stress compensated transducer |
US5253526A (en) * | 1990-05-30 | 1993-10-19 | Copal Company Limited | Capacitive acceleration sensor with free diaphragm |
US5347867A (en) * | 1993-02-03 | 1994-09-20 | Minnetonka Warehouse Supply, Inc | Accelerometer incorporating a driven shield |
US5827965A (en) * | 1994-06-20 | 1998-10-27 | Sony Corporation | Navigation device employing an electret vibration sensor |
WO2004092745A1 (de) * | 2003-04-15 | 2004-10-28 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V. | Mikromechanisches bauelement mit einstellbarer resonanzfrequenz |
JP4073382B2 (ja) * | 2003-09-02 | 2008-04-09 | ホシデン株式会社 | 振動センサ |
JP2005098727A (ja) * | 2003-09-22 | 2005-04-14 | Hosiden Corp | 振動センサ |
JP2006078444A (ja) * | 2004-09-13 | 2006-03-23 | Hosiden Corp | 加速度センサ |
JP2006084219A (ja) * | 2004-09-14 | 2006-03-30 | Hosiden Corp | 加速度センサ |
-
2003
- 2003-09-22 JP JP2003329877A patent/JP2005098726A/ja active Pending
-
2004
- 2004-07-29 TW TW093122750A patent/TWI238245B/zh not_active IP Right Cessation
- 2004-09-08 US US10/572,424 patent/US20070107521A1/en not_active Abandoned
- 2004-09-08 EP EP04787729A patent/EP1666855A1/en not_active Withdrawn
- 2004-09-08 CN CNA200480027160XA patent/CN1853090A/zh active Pending
- 2004-09-08 WO PCT/JP2004/013046 patent/WO2005029013A1/ja not_active Application Discontinuation
- 2004-09-08 CA CA002529136A patent/CA2529136A1/en not_active Abandoned
- 2004-09-16 KR KR1020040074106A patent/KR20050029686A/ko not_active Application Discontinuation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5979700A (ja) * | 1982-10-28 | 1984-05-08 | Katsuo Motoi | 振動検知装置 |
JPS61102828U (ja) * | 1984-12-10 | 1986-06-30 | ||
JPH0432774A (ja) * | 1990-05-30 | 1992-02-04 | Copal Co Ltd | 加速度センサ |
JPH06230023A (ja) * | 1992-03-04 | 1994-08-19 | Omron Corp | 変位検出センサ |
WO1995035485A1 (fr) * | 1994-06-20 | 1995-12-28 | Sony Corporation | Capteur de vibrations et instrument de navigation |
JPH1026554A (ja) * | 1996-07-12 | 1998-01-27 | Omron Corp | 感震器およびガスメータ |
JP2000346867A (ja) * | 1999-06-02 | 2000-12-15 | Topre Corp | 加速度センサ |
Also Published As
Publication number | Publication date |
---|---|
CA2529136A1 (en) | 2005-03-31 |
JP2005098726A (ja) | 2005-04-14 |
CN1853090A (zh) | 2006-10-25 |
KR20050029686A (ko) | 2005-03-28 |
US20070107521A1 (en) | 2007-05-17 |
TWI238245B (en) | 2005-08-21 |
TW200512436A (en) | 2005-04-01 |
EP1666855A1 (en) | 2006-06-07 |
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