EP1665879B1 - Transducteur de force electromecanique - Google Patents
Transducteur de force electromecanique Download PDFInfo
- Publication number
- EP1665879B1 EP1665879B1 EP04768390A EP04768390A EP1665879B1 EP 1665879 B1 EP1665879 B1 EP 1665879B1 EP 04768390 A EP04768390 A EP 04768390A EP 04768390 A EP04768390 A EP 04768390A EP 1665879 B1 EP1665879 B1 EP 1665879B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- transducer
- transducer according
- resonant elements
- stub
- damping layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000013016 damping Methods 0.000 claims description 25
- 238000005452 bending Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000001419 dependent effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 12
- 239000006260 foam Substances 0.000 description 6
- 230000009467 reduction Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 230000014616 translation Effects 0.000 description 1
Images
Classifications
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
- H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion
Definitions
- the invention relates to electromechanical force transducers, actuators, exciters and the like devices and more particularly but not exclusively, to such devices for use in acoustic apparatus, e.g. loudspeakers and microphones.
- the invention relates particularly, but not exclusively, to electromechanical force transducers of the kind described in International patent application WO01/54450 to the present applicants, and comprising one or more resonant elements or beams having a frequency distribution of modes in the operative frequency range of the transducer.
- Such transducers are known as "distributed mode actuators" or DMA for short.
- Another object of the invention is to reduce the first resonant mode frequency of an actuator or transducer, e.g. a DMA transducer.
- the invention is a transducer of the kind described wherein a low stiffness layer is inserted between, and bonded to the adjacent faces of a plurality of resonant elements.
- a damping layer to one face of a resonant element or beam gives poor damping performance as the layer stretches with the element as the element face changes dimensions.
- a flexible reference layer with a high resistance to dimensional change, such as a foil on the other side of the damping layer results in an improvement in damping as the damping layer now shears between the changing element face dimension and the non-stretching foil. If the reference layer can be made to change dimension in opposition to the damped face, the damping effect will be doubled. This is the effect gained by adhering the damping layer between adjacent element faces.
- FIG. 1 shows a double beam transducer of the kind generally described in WO01/54450.
- the transducer (1) comprises a first piezoelectric beam (2) on the back of which is mounted a second piezoelectric beam (3) by connecting means in the form of a rigid stub (4) located near to the centre of both beams.
- Each beam is a bimorph.
- the measured resistance, R is approx 8 x 10 5 Ns/m3. These figures are the measured 'real' part of the mechanical resistance when in compression, not shear. Shear figures are not available.
- the density (in isolation from E and R) is expected to be irrelevant, and could vary by a factor of 100 and have little effect.
- E is important but the shearing that is occurring makes the importance of E difficult to identify.
- a reduction of E would have little effect as it appears the system stiffness is not being affected too much by the addition of the foam.
- the R figure is important. Reducing R is expected to effect damping in a linear fashion. We suggest that it is not reduced by more than a factor of say 4. Increasing R is good but cannot be achieved without affecting the other parameters.
- Figure 2 shows the effect of bonding to one face or to both faces of multibeam transducer.
- Figure 2a shows the case where the damping layer (7) is only bonded to one beam (2).
- the damping layer is bonded to both beams, and so is forced into shear by the relative movement of beam (3) in relation to beam (2). It is this shearing which applies damping.
- Figure 4 shows the simulated effect on acoustic pressure of adding a damping between the faces of a 36mm/34mm beam length DMA transducer. Output at the transducer fundamental is slightly reduced, but a broad increase in output occurs in 3-4kHz region. This is the region of internal cancellation in the transducer. The acoustic pressure response is also smoother.
- Drop test failure rates are expected to be reduced. At impact most of the energy will be present in the exciter at its fundamental resonance. Since the damping reduces the Q of this resonance, the instantaneous maximum displacement will be reduced, resulting in reduced stress in the beam. This stress reduction is expected to improve drop test reliability. In addition, the build height of the transducer can be reduced by the present invention.
- the stub used to couple a transducer of the kind described above to its load is stiff in all 3 cartesian axes and rotational stiffness is usually ignored, and is assumed to be high.
- 0 rotation occurs at the stub for the beam fundamental resonance. If this 0 rotation boundary condition is replicated at the end of a half length beam the fundamental will occur at the same frequency as the full length beam, with half the force.
- This is the cantilever condition, see Figure 5.
- Figure 5 is a diagram showing fundamental mode shape of a cantilever beam (that is an extreme offset stub). The displaced shape shows pure bending motion.
- FIG. 6 is a diagram of a modeshape of a beam coupled to a panel with a soft stub allowing rotation of the beam, the modeshape showing some bending in the beam and some rotational translations.
- the mode drops to 0 Hz and is a rigid body mode.
- Reference (9) represents a trapped air layer behind the panel (5), which in the simulation couples to the panel and affects the modal set of resonances in the panel
- reference (10) represents the body of a cell phone containing a loudspeaker formed by the panel (5) and transducer (1). It will be noted that the deflection of the beam (2) is greatly exaggerated so that it is visible.
- a solid stub will have the same stiffness in the 3 translational and rotational axes.
- different stiffnesses in the 6 different axes can be generated. The result is that modes in the different axes occur at different frequencies. If the load impedance is asymmetric, modes involving movement in directions other than normal to the beam surface can couple into the panel, providing increased modal density, see Figure 8.
- Figure 8a is a graph of simulated effect on acoustic pressure generated by changing stub stiffness.
- Figure 8b is a perspective view of a panel-form loudspeaker having a panel(5) with an attached transducer mounted on a soft stub (6) of I-beam section and showing the DMA moving in-plane.
- this mode is not present if the rotational stiffness around the axis (8) normal to the plane of the panel is ignored.
- the first mode is partly due to rotational stiffness around the axis along the short edge of the beam
- the second mode is due to the stiffness around the axis normal to the beam.
- the last rotational axis, around the axis moving along the length of the beam will also generate a mode.
- the fundamental resonance By changing the fundamental resonance from a purely bending motion in the beam to a partly translatory motion, the stress in the beam is reduced at the fundamental. Since the fundamental resonance will receive the most energy during impact, the beam is more likely to survive without damage as most of the deformation will occur in the stub.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Claims (12)
- Transducteur à force électromécanique comprenant une pluralité d'éléments résonants, une couche d'amortissement couplée entre les faces contiguës d'au moins deux éléments résonants contigus, et un élément de tronçon sur lequel les éléments résonants sont supportés et pour coupler le transducteur à un site sur lequel est appliquée une force, caractérisé en ce que la couche d'amortissement est choisie de telle sorte que la sortie est augmentée dans la région de fréquence d'annulation interne du transducteur.
- Transducteur selon la revendication 1, dans lequel la couche d'amortissement est en plastique alvéolaire.
- Transducteur selon la revendication 2, dans lequel le plastique alvéolaire présente des caractéristiques de faible rebond.
- Transducteur selon l'une quelconque des revendications 1 à 3, dans lequel la couche d'amortissement se présente sous la forme d'une couche collée sur l'ensemble ou sur une partie substantielle des faces contiguës des éléments résonants.
- Transducteur selon l'une quelconque des revendications précédentes, dans lequel les éléments résonants sont en forme de poutre.
- Transducteur selon l'une quelconque des revendications précédentes, dans lequel le tronçon présente une rigidité de rotation faible, de telle sorte que la résonance fondamentale du transducteur devient moins dépendante du mouvement de flexion du transducteur et plus rigide dans l'ensemble.
- Transducteur selon la revendication 6, dans lequel le tronçon présente des rigidités différentes dans les axes de translation et de rotation, de telle sorte que les modes dans les différents axes se produisent à des fréquences différentes.
- Transducteur selon l'une quelconque des revendications précédentes, dans lequel les paramètres de l'élément résonant sont choisis pour accroître la répartition des modes dans l'élément, dans la plage de fréquences opérantes, avec les paramètres qui sont choisis à partir du groupe consistant en rapport d'aspect, isotropie de rigidité de flexion, isotropie d'épaisseur et géométrie.
- Transducteur selon l'une quelconque des revendications précédentes, dans lequel au moins l'un des éléments résonants est actif, par exemple en piézomatière.
- Transducteur selon l'une quelconque des revendications précédentes, dans lequel l'élément à faible rigidité est couplé entre sensiblement l'ensemble des faces contiguës.
- Transducteur de force électromécanique selon l'une quelconque des revendications précédentes, dans lequel les éléments résonants ont une répartition de fréquence des modes dans la plage de fréquences opérantes du transducteur.
- Haut-parleur comprenant un transducteur selon l'une quelconque des revendications précédentes, et un élément de radiation acoustique en forme de panneau à ondes fléchissantes sur lequel est couplé le transducteur.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB0321292.5A GB0321292D0 (en) | 2003-09-11 | 2003-09-11 | Transducer |
PCT/GB2004/003843 WO2005027571A1 (fr) | 2003-09-11 | 2004-09-09 | Trasnducteur de force electromecanique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1665879A1 EP1665879A1 (fr) | 2006-06-07 |
EP1665879B1 true EP1665879B1 (fr) | 2007-02-28 |
Family
ID=29226902
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04768390A Expired - Fee Related EP1665879B1 (fr) | 2003-09-11 | 2004-09-09 | Transducteur de force electromecanique |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP1665879B1 (fr) |
JP (1) | JP5128127B2 (fr) |
KR (1) | KR101176671B1 (fr) |
CN (1) | CN1839659B (fr) |
DE (1) | DE602004005060T2 (fr) |
GB (1) | GB0321292D0 (fr) |
HK (1) | HK1094748A1 (fr) |
TW (1) | TWI343755B (fr) |
WO (1) | WO2005027571A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11297416B2 (en) | 2020-01-17 | 2022-04-05 | Shenzhen Shokz Co., Ltd. | Microphone and electronic device having the same |
US11843923B2 (en) | 2020-01-17 | 2023-12-12 | Shenzhen Shokz Co., Ltd. | Microphone and electronic device having the same |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0414652D0 (en) * | 2004-06-30 | 2004-08-04 | New Transducers Ltd | Transducer or actuator |
JP6304168B2 (ja) * | 2015-08-06 | 2018-04-04 | Tdk株式会社 | 圧電モジュール |
US10356523B2 (en) * | 2017-12-13 | 2019-07-16 | Nvf Tech Ltd | Distributed mode loudspeaker actuator including patterned electrodes |
US10681471B2 (en) | 2017-12-22 | 2020-06-09 | Google Llc | Two-dimensional distributed mode actuator |
US10631072B2 (en) | 2018-06-25 | 2020-04-21 | Google Llc | Actuator for distributed mode loudspeaker with extended damper and systems including the same |
JP7148481B2 (ja) | 2019-12-04 | 2022-10-05 | エルジー ディスプレイ カンパニー リミテッド | 表示装置 |
WO2021142913A1 (fr) * | 2020-01-17 | 2021-07-22 | Shenzhen Voxtech Co., Ltd. | Microphone et dispositif électronique le comprenant |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3440363A (en) * | 1965-11-26 | 1969-04-22 | Bell Telephone Labor Inc | Shock-resistant microphone |
JPS63110900A (ja) * | 1986-10-28 | 1988-05-16 | Murata Mfg Co Ltd | 振動アラ−ム装置 |
US4969197A (en) * | 1988-06-10 | 1990-11-06 | Murata Manufacturing | Piezoelectric speaker |
US5805726A (en) * | 1995-08-11 | 1998-09-08 | Industrial Technology Research Institute | Piezoelectric full-range loudspeaker |
JP2000201398A (ja) | 1998-06-30 | 2000-07-18 | Shinsei Kk | スピ―カ |
IL140038A0 (en) * | 1998-07-03 | 2002-02-10 | New Tranducers Ltd | Resonant panel-form loudspeaker |
TW511391B (en) * | 2000-01-24 | 2002-11-21 | New Transducers Ltd | Transducer |
US7151837B2 (en) * | 2000-01-27 | 2006-12-19 | New Transducers Limited | Loudspeaker |
JP2004087662A (ja) * | 2002-08-26 | 2004-03-18 | Fdk Corp | 圧電素子 |
-
2003
- 2003-09-11 GB GBGB0321292.5A patent/GB0321292D0/en not_active Ceased
-
2004
- 2004-09-09 JP JP2006525885A patent/JP5128127B2/ja not_active Expired - Fee Related
- 2004-09-09 CN CN2004800241303A patent/CN1839659B/zh not_active Expired - Fee Related
- 2004-09-09 DE DE602004005060T patent/DE602004005060T2/de active Active
- 2004-09-09 WO PCT/GB2004/003843 patent/WO2005027571A1/fr active IP Right Grant
- 2004-09-09 EP EP04768390A patent/EP1665879B1/fr not_active Expired - Fee Related
- 2004-09-09 KR KR1020067005034A patent/KR101176671B1/ko not_active IP Right Cessation
- 2004-09-10 TW TW093127527A patent/TWI343755B/zh not_active IP Right Cessation
-
2006
- 2006-12-06 HK HK06113403A patent/HK1094748A1/xx not_active IP Right Cessation
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11297416B2 (en) | 2020-01-17 | 2022-04-05 | Shenzhen Shokz Co., Ltd. | Microphone and electronic device having the same |
US11671746B2 (en) | 2020-01-17 | 2023-06-06 | Shenzhen Shokz Co., Ltd. | Microphone and electronic device having the same |
US11843923B2 (en) | 2020-01-17 | 2023-12-12 | Shenzhen Shokz Co., Ltd. | Microphone and electronic device having the same |
Also Published As
Publication number | Publication date |
---|---|
EP1665879A1 (fr) | 2006-06-07 |
HK1094748A1 (en) | 2007-04-04 |
KR101176671B1 (ko) | 2012-08-23 |
TWI343755B (en) | 2011-06-11 |
WO2005027571A1 (fr) | 2005-03-24 |
JP2007505539A (ja) | 2007-03-08 |
CN1839659B (zh) | 2011-05-04 |
DE602004005060D1 (de) | 2007-04-12 |
KR20060119972A (ko) | 2006-11-24 |
GB0321292D0 (en) | 2003-10-15 |
DE602004005060T2 (de) | 2007-11-22 |
TW200522760A (en) | 2005-07-01 |
JP5128127B2 (ja) | 2013-01-23 |
CN1839659A (zh) | 2006-09-27 |
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Inventor name: HOYLE, STEVEN, MARKCYGNET HOUSE, KINGFISHER WAY Inventor name: EAST, JAMES, JOHNCYGNET HOUSE, KINGFISHER WAY Inventor name: OWEN, NEIL, SIMONCYGNET HOUSE, KINGFISHER WAY Inventor name: STARNES, MARK, WILLIAMCYGNET HOUSE,KINGFISHER WAY |
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