WO2001099205A1 - Piezoelektrischer biegewandler - Google Patents
Piezoelektrischer biegewandler Download PDFInfo
- Publication number
- WO2001099205A1 WO2001099205A1 PCT/DE2001/002250 DE0102250W WO0199205A1 WO 2001099205 A1 WO2001099205 A1 WO 2001099205A1 DE 0102250 W DE0102250 W DE 0102250W WO 0199205 A1 WO0199205 A1 WO 0199205A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- carrier
- bending transducer
- glass
- piezoceramic
- fibers
- Prior art date
Links
- 238000005452 bending Methods 0.000 title claims abstract description 27
- 239000011521 glass Substances 0.000 claims abstract description 22
- 239000000835 fiber Substances 0.000 claims abstract description 17
- 229920003235 aromatic polyamide Polymers 0.000 claims abstract description 9
- 239000003822 epoxy resin Substances 0.000 claims abstract description 8
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 8
- 229920001187 thermosetting polymer Polymers 0.000 claims description 9
- 239000004760 aramid Substances 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 241000531908 Aramides Species 0.000 abstract description 7
- 239000003365 glass fiber Substances 0.000 abstract description 2
- 238000005524 ceramic coating Methods 0.000 abstract 1
- 239000002131 composite material Substances 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229920006231 aramid fiber Polymers 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229920000271 Kevlar® Polymers 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 229920000561 Twaron Polymers 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000004761 kevlar Substances 0.000 description 1
- 239000011224 oxide ceramic Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 239000004762 twaron Substances 0.000 description 1
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
- H10N30/20—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators
-
- 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
- H10N30/20—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators
- H10N30/204—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators using bending displacement, e.g. unimorph, bimorph or multimorph cantilever or membrane benders
- H10N30/2041—Beam type
- H10N30/2042—Cantilevers, i.e. having one fixed end
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
Definitions
- the invention relates to a piezoelectric bending transducer with a piezoceramic applied on at least one side to a carrier.
- a piezoelectric bending transducer of the type mentioned at the outset primarily serves to exploit the indirect or reciprocal piezoelectric effect, i.e. for converting electrical into mechanical energy.
- a bending transducer There are a large number of technical applications for a bending transducer. Such applications are e.g. as a piezoelectric printhead for an inkjet printer, as a sound pick-up or generator for microphones or loudspeakers, as a sensor for acceleration or pressure measurement, as a control element in Braille lines in reading devices for the blind, in textile machines, in pneumatic valves, in writing measuring devices or in contactless devices surface measuring instruments.
- a bending transducer is built up in a layer structure.
- the piezoceramic is applied to a carrier in order to improve the mechanical stability or for the purpose of better conversion of electrical into mechanical energy.
- the piezoceramic is optionally provided on both sides with electrodes in the form of a flat covering made of a conductive material.
- the support can be provided on one or two sides with the layer sequence described.
- several layers of piezoceramics including the electrodes can also be stacked one above the other.
- the object of the invention is to provide a piezoelectric bending transducer which has a good mechanical deflection capacity, ie a high deflection with a comparatively low operating voltage.
- the carrier comprises a glass with a coefficient of thermal expansion of less than 2 ⁇ 10 6 / K and in that the coating made of the piezo ceramic is thermally bonded to the carrier.
- the carrier can either consist of the glass itself or of a thermoset reinforced by fibers from the glass.
- the wearer Since the thermal expansion coefficient of a thermoset reinforced with fibers is essentially dependent on the fibers used, the wearer has a smaller thermal expansion coefficient than the piezoceramic when using the above-mentioned glass Has thermal expansion coefficient between 4 and 6 x 10 ⁇ 6 / K. Due to the heat treatment during the thermal bonding of the coating made of the piezoceramic to the carrier, the piezoceramic remains to a certain extent pre-stressed after cooling. The distortion of the lattice structure of the piezoceramic caused by the bias acts to support polarization. The piezoceramic thermally bonded to the carrier, comprising the glass mentioned shows at the same operating voltage a higher length expansion or contraction than the piezoceramic not glued to such a carrier.
- a glass with a coefficient of thermal expansion of less than 2 x 10 _6 / K is, for example, the glass sold under the trade name "S2-Glass” by Owens Corning Advanced Materials. "S2-Glass” is a registered trademark of Owens Corning. This S2 glass shows a coefficient of thermal expansion of 1.6 x 10 -6 / K.
- any other glass, for example a quartz glass, with a coefficient of thermal expansion within the specified range is also suitable for use with the piezoelectric bending transducer.
- the carrier advantageously comprises a thermoset reinforced by fibers from the glass.
- a so-called prepreg (not yet hardened, soft, pre-impregnated blank and containing fibers) is used for the carrier.
- the prepreg is laid loosely in a suitable shape together with the piezoceramic intended for the coating.
- the prepreg wets the surfaces of the piezoceramics or the electrodes applied to them by lightly pressing and thereby glues to them. Through a final heat treatment, the prepreg finally cures irreversibly to the thermoset.
- a permanent and stable connection of the components of the bending transducer is obtained in a simple manner.
- thermoset is additionally reinforced with aramid fibers.
- the mechanical properties of the piezoelectric bending transducer are further improved by introducing the aramid fibers.
- Aramid shows a negative coefficient of thermal expansion of less than -0.5 x 10 ⁇ 6 / K. In this manner and way the bias of the piezoceramic is further increased after the manufacturing process.
- Suitable aramids are, for example, the aramid sold by DuPont under the brand name Kevlar or the aramid available from Akzo Nobel under the brand name Twaron.
- the fibers are arranged unidirectionally and extend parallel to a predetermined longitudinal direction of the carrier. This results in the thermal bonding of the
- Prepregs with the coating made of piezoceramic direct the piezoceramic in the longitudinal direction.
- the piezoceramic is therefore biased in the direction of its expansion or contraction when an electrical field is applied to the electrodes.
- the unidirectional alignment also achieves the largest elastic modulus of the wearer in the longitudinal direction. Cross effects can essentially be neglected.
- An epoxy resin is advantageously suitable as the material for the thermoset.
- An epoxy resin reinforced with fibers in the form of a prepreg can be easily and inexpensively processed into the piezoelectric bending transducer.
- the mass fraction of the epoxy resin in the carrier is between 25 and 45% by weight. This ensures that the hardness and flexibility are high enough.
- 1 shows in three dimensions the structure of a piezoelectric bending transducer
- 2 shows an enlarged view of a section through a piezoelectric bending transducer.
- FIG. 1 shows a bimorph bending transducer 1 with a carrier 2 and with a first and second coating 4, 5 made of a piezoceramic applied thereon.
- the piezoceramic is a lead zirconate titanium oxide ceramic.
- the carrier 2 is an epoxy resin reinforced with glass fibers.
- the glass of the fibers is an S2 glass from Owens Corning Advanced Materials and has a coefficient of thermal expansion of 1.6 x 10 ⁇ ⁇ / K.
- fibers made of aramid are introduced, the weight ratio being between 40:60 and 60:40 in the fiber fraction.
- An epoxy prepreg was used as the starting material for the carrier. The prepreg was thermally bonded and cured by means of heat treatment with the layers 4, 5 made of the piezoceramic.
- the bending transducer 1 also has electrical connections 6, which are each electrically connected via a solder contact to electrodes 7 and 8 arranged on the carrier 2.
- the layers 4, 5 made of the piezoceramic are provided on both sides with electrodes 9, 11 and 10, 12, respectively.
- the electrodes 7 and 8 of the carrier 2, not shown here, are not flat at the locations of the carrier 2 at which the layers 4, 5 of the piezoceramic are placed, but rather as a fabric or in the form of parallel webs.
- the not yet cured epoxy resin flows through the electrodes 7 and 8 onto the electrodes 11 and 12 and thus bonds the carrier 2 to the layers 4, 5 made of the piezoceramic via the electrodes during curing.
- the electrodes 9, 10, 11 and 12 of the layers 4, 5 of the piezoceramic are each formed as a flat covering made of a carbon polymer. Due to the lower coefficient of thermal expansion of the carrier 2 compared to the thermal expansion coefficient of the piezoceramic, the latter is prestressed during thermal bonding.
- FIG. 2 shows an enlarged representation of a section through the bending transducer 1 shown in FIG. 1.
- the layers 4, 5 made of the piezoceramic and the electrodes 9, 11 and 10, 12 applied thereon can again be seen.
- the electrodes 7, 8 applied to the carrier 2 are designed as parallel webs 13 extending in the longitudinal direction of the carrier 2.
- the fibers 14 made of glass and the fibers 15 made of aramid are unidirectional and aligned in the longitudinal direction of the carrier 2. In this way, when the prepreg is thermally bonded to the layers 4, 5 of the piezoceramic, the piezoceramic is pretensioned in the longitudinal direction of the carrier 2.
- the unidirectional orientation of the fibers 14, 15 also achieves the greatest modulus of elasticity of the carrier 2 in the longitudinal direction. Cross effects can be neglected.
Landscapes
- Laminated Bodies (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
- Glass Compositions (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002503955A JP2003536278A (ja) | 2000-06-21 | 2001-06-18 | 圧電湾曲変換器 |
US10/311,934 US20040012308A1 (en) | 2000-06-21 | 2001-06-18 | Piezo-electric bending transducer |
EP01951401A EP1292995A1 (de) | 2000-06-21 | 2001-06-18 | Piezoelektrischer biegewandler |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10030.397.8 | 2000-06-21 | ||
DE10030397 | 2000-06-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001099205A1 true WO2001099205A1 (de) | 2001-12-27 |
Family
ID=7646411
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2001/002250 WO2001099205A1 (de) | 2000-06-21 | 2001-06-18 | Piezoelektrischer biegewandler |
Country Status (8)
Country | Link |
---|---|
US (1) | US20040012308A1 (de) |
EP (1) | EP1292995A1 (de) |
JP (1) | JP2003536278A (de) |
KR (1) | KR20030010664A (de) |
CN (1) | CN1437771A (de) |
DE (1) | DE20122677U1 (de) |
TW (1) | TW512550B (de) |
WO (1) | WO2001099205A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1791192A1 (de) * | 2005-11-25 | 2007-05-30 | Festo Ag & Co. | Piezo-Biegewandler |
DE102017118220A1 (de) * | 2017-08-10 | 2019-02-14 | Dr. Schneider Kunststoffwerke Gmbh | Vibrationseinheit |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4583188B2 (ja) * | 2004-03-29 | 2010-11-17 | 京セラ株式会社 | 加速度センサ |
US7394610B2 (en) * | 2005-06-28 | 2008-07-01 | Kyocera Corporation | Acceleration sensor and magnetic disk device using the same |
JP5391395B2 (ja) * | 2007-10-15 | 2014-01-15 | 日立金属株式会社 | 圧電薄膜付き基板及び圧電素子 |
JP2012178466A (ja) * | 2011-02-25 | 2012-09-13 | Wac Data Service Kk | アクチュエータおよび繊維機械用ユニット |
TWI679559B (zh) | 2018-02-01 | 2019-12-11 | 矽統科技股份有限公司 | 使用者與觸控筆的互動方法以及觸控筆產品 |
JP7445574B2 (ja) | 2020-09-25 | 2024-03-07 | 株式会社Ihiエアロスペース | 発電機能性プリプレグシート及び発電機能性複合材と発電機能性プリプレグシートの製造方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19520796A1 (de) * | 1995-06-07 | 1996-12-12 | Siemens Ag | Piezoelektrischer Biegewandler |
DE19620826A1 (de) * | 1996-05-23 | 1997-11-27 | Siemens Ag | Piezoelektrisches Element sowie Verfahren zu dessen Herstellung |
DE19920576C1 (de) * | 1999-05-04 | 2000-06-21 | Siemens Ag | Piezoelektrischer Biegewandler |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US84720A (en) * | 1868-12-08 | Improved metal last | ||
JPS6048112B2 (ja) * | 1979-05-02 | 1985-10-25 | ソニー株式会社 | 電気・機械変換素子 |
CA1165860A (en) * | 1979-12-12 | 1984-04-17 | Susumu Nishigaki | Piezoelectric electro-mechanical bimorph transducer |
JPS6066882A (ja) * | 1983-09-22 | 1985-04-17 | Murata Mfg Co Ltd | 圧電変位素子およびその分極方法 |
FR2567705B1 (fr) * | 1984-07-13 | 1986-11-14 | Thomson Csf | Transducteur piezoelectrique et capteur de pression utilisant un tel transducteur |
-
2001
- 2001-06-18 TW TW090114704A patent/TW512550B/zh not_active IP Right Cessation
- 2001-06-18 DE DE20122677U patent/DE20122677U1/de not_active Expired - Lifetime
- 2001-06-18 US US10/311,934 patent/US20040012308A1/en not_active Abandoned
- 2001-06-18 JP JP2002503955A patent/JP2003536278A/ja not_active Withdrawn
- 2001-06-18 KR KR1020027016583A patent/KR20030010664A/ko not_active Application Discontinuation
- 2001-06-18 CN CN01811557A patent/CN1437771A/zh active Pending
- 2001-06-18 WO PCT/DE2001/002250 patent/WO2001099205A1/de not_active Application Discontinuation
- 2001-06-18 EP EP01951401A patent/EP1292995A1/de not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19520796A1 (de) * | 1995-06-07 | 1996-12-12 | Siemens Ag | Piezoelektrischer Biegewandler |
DE19620826A1 (de) * | 1996-05-23 | 1997-11-27 | Siemens Ag | Piezoelektrisches Element sowie Verfahren zu dessen Herstellung |
DE19920576C1 (de) * | 1999-05-04 | 2000-06-21 | Siemens Ag | Piezoelektrischer Biegewandler |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1791192A1 (de) * | 2005-11-25 | 2007-05-30 | Festo Ag & Co. | Piezo-Biegewandler |
DE102017118220A1 (de) * | 2017-08-10 | 2019-02-14 | Dr. Schneider Kunststoffwerke Gmbh | Vibrationseinheit |
DE102017118220B4 (de) * | 2017-08-10 | 2020-02-06 | Dr. Schneider Kunststoffwerke Gmbh | Vibrationseinheit |
Also Published As
Publication number | Publication date |
---|---|
JP2003536278A (ja) | 2003-12-02 |
EP1292995A1 (de) | 2003-03-19 |
TW512550B (en) | 2002-12-01 |
KR20030010664A (ko) | 2003-02-05 |
US20040012308A1 (en) | 2004-01-22 |
DE20122677U1 (de) | 2007-04-05 |
CN1437771A (zh) | 2003-08-20 |
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