EP0910848B1 - Piezo-electric actuator-transducer for sound reproduction systems - Google Patents

Piezo-electric actuator-transducer for sound reproduction systems Download PDF

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Publication number
EP0910848B1
EP0910848B1 EP97930512A EP97930512A EP0910848B1 EP 0910848 B1 EP0910848 B1 EP 0910848B1 EP 97930512 A EP97930512 A EP 97930512A EP 97930512 A EP97930512 A EP 97930512A EP 0910848 B1 EP0910848 B1 EP 0910848B1
Authority
EP
European Patent Office
Prior art keywords
piezo
electric actuator
transducer
container
ceramic plate
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 - Lifetime
Application number
EP97930512A
Other languages
German (de)
French (fr)
Other versions
EP0910848A1 (en
Inventor
Franco Steccazzini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Centro Ricerche Fiat SCpA
Original Assignee
Centro Ricerche Fiat SCpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Centro Ricerche Fiat SCpA filed Critical Centro Ricerche Fiat SCpA
Publication of EP0910848A1 publication Critical patent/EP0910848A1/en
Application granted granted Critical
Publication of EP0910848B1 publication Critical patent/EP0910848B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings
    • G10K9/22—Mountings; Casings

Definitions

  • the present invention is related to piezo-electric actuator-transducers for sound reproduction systems.
  • the invention is directed to sound reproduction system applications wherein the piezoelectric actuator-transducer defines a vibration means to be secured to a panel forming part of a structure and whose vibrations would normally constitute an undesired effect.
  • Examples of these applications are disclosed and illustrated in WO 97/16048 in the name of the same Applicant (unpublished at the priority date of the present application), wherein the panel to which the piezo-electric actuator-transducer is applied consists of a vehicle body element.
  • the piezo-electric actuator-transducer comprises in a known way a thin ceramic plate having a securing face thereof to said panel and a pair of electrodes connected to the plate.
  • the present invention is directed to a novel and unique expedient enabling to enhance securing of the piezo-electric actuator-transducer both in connection to a safer and more reliable anchoring thereof, and as far as easier and more convenient fixing operation thereof are concerned.
  • this object is achieved primarily by virtue of the fact that the ceramic plate of the piezo-electric actuator-transducer is fitted within a substantially tray-like container made of a relatively flexible material, having a peripheral flange provided with an adhesive layer; a seat, surrounded by said peripheral flange and having a shape complementary to that of the ceramic plate, in which said ceramic plate is housed and fixed with the securing face thereof facing to the outside of the container and arranged in a lowered plane with respect to the adhesive layer of said peripheral flange; and a receptacle interposed between said peripheral flange and said seat for the ceramic plate.
  • the provision of the above container enables on one hand to effectively protect the piezo-electric actuator-transducer in its installed condition and on the other hand, due to its relatively flexible construction, to make securing operation of the ceramic plate (which is instead relatively rigid and fragile) easier even onto non perfectly planar, and even curved or crowned surfaces.
  • the receptacle provided between the peripheral flange of the container and the seat for the ceramic plate is able to further facilitate application of the piezo-electric actuator-transducer onto the related panel, since, upon adhesion of the adhesive layer of the peripheral flange of the container against the panel onto which the piezo-electric actuator-transducer is to be applied, any excess or squeezed amount of the structural adhesive layered over the securing face of the ceramic plate is allowed to pour into the receptacle, thus being received and captured thereby. Accordingly the adhesive surfaces of the peripheral flange and of the securing face of the ceramic plate are ensured to be arranged substantially at the same level, i.e. under perfect adhesive contact with the panel to which the piezo-electric actuator-transducer is secured.
  • the container may be conveniently closed by a covering sheet peelably adhering to the adhesive layer of said peripheral flange and to be removed prior to securing the piezo-electric actuator-transducer onto said panel.
  • the receptacle interposed between the peripheral flange and the seat for the ceramic plate of the container is advantageously designed as an annular channel, and according to a preferred embodiment of the invention this annular channel is communicating with said seat for the ceramic plate through passages arranged substantially at the same level of the securing face of the ceramic plate.
  • the housing may be circular, quadrangular or even polygonal.
  • the flange of the container which is normally made of moulded thermoplastic material, may be formed with a passage for outer wires connected to the electrodes of the piezo-electric actuator-transducer.
  • reference numeral 1 generally designates a piezo-electric actuator-transducer according to the invention, to be employed with a sound reproduction system comprising a sound pick-up or sound receiver apparatus, an amplifier apparatus and at least one vibrating-element sound emitter, formed by a panel or the like to which the piezo-electric actuator-transducer 1 is secured in the way which will be clarified herebelow.
  • the vibrating panel to which the piezo-electric actuator-transducer is to be secured may be constituted by a structural member of motor-vehicle body or by the shall of a helmet, or by the body of an illuminating apparatus or by any other element adapted to vibrate so has to produce sounds.
  • the piezo-electric actuator-transducer 1 is formed, according to the invention, by a thin ceramic plate 2 of a conventional type, provided also in a way known per se with a pair of electrodes (not shown) connected to outer wires 3, and by a container 4 within which the ceramic plate 2 is fitted and permanently fixed.
  • the ceramic plate 2 and the container 4 have a circular design: it is however to be pointed out that the shape of either one or both may be different, for instance quadrangular or polygonal.
  • the ceramic plate 2 may be for instance of the type produced and marketed by Hoechst AG under the trade name Sonox® P 51 and the like.
  • the container 4 has a generally cup or tray-like configuration and is made of a relatively flexible material, for instance a moulded thermoplastic material.
  • the container 4 is formed with a peripheral annular flange 5 whose face intended to be placed into contact with the panel P is covered by an adhesive layer 6 which can be constituted, for instance, by a bi-adhesive annular film.
  • the container 4 is formed with a lowered seat 7 having a shape complementary of that of the ceramic plate 2, within which this ceramic plate 2 is housed and fixed, in correspondence of its inner face, by means of an adhesive layer 8.
  • the depth of the seat 7 is greater than the thickness of the ceramic plate 2 added to the thickness of the inner adhesive layer 8, whereby the outer face of this ceramic plate 2, designated as 2a, is arranged in a lowered plane with respect to the outer surface of the adhesive layer 6 of the peripheral flange 5.
  • the difference in height therebetween may be normally comprised between 0.05 and 0.03 mm, and is preferably about 0.1 mm.
  • the container 4 is formed with a receptacle designed as an annular channel 9, which is also lowered with respect to the peripheral flange 5.
  • This intermediate annular channel 9 is in communication with the seat 7 through passages arranged substantially at the same level as the outer face 2a of the ceramic plate 2. In the case of the shown example, these passages are formed by a number of radial grooves 10 provided on top of the wall delimiting the seat 7.
  • the container 4 may be formed with outer stiffening ribs 11. Moreover the back of the annular flange 5 is conveniently provided with an integral tunnel 12 passed through by the outer wires 3.
  • the piezo-electric actuator-transducer 1 is provided with a cover sheet 13 adhering in a peelable way to the adhesive layer 6 of the peripheral flange 5, so as to overlay the outer face 2a of the ceramic plate 2.
  • the cover sheet 13 is removed (such as shown in figure 2), so as to expose the adhesive layer 6 and the outer face 2a of the ceramic plate 2.
  • a layer of structural adhesive 14, normally comprising a high elasticity modulus resin is deposited onto the outer face 2a, such as shown in figure 4.
  • the piezo-electric actuator-transducer 1 is brought into contact against the panel P, adhering thereonto the adhesive layer 6 of the peripheral flange 5, as well as the structural adhesive layer 14 applied on the outer face 2a of the ceramic plate 2.
  • any excess or squeezed amount of the structural adhesive 14 pours through the passages 10 into the receptacle 9, thus being captured therein.
  • This ensures the thickness of the structural adhesive 14 to be that necessary and sufficient to fill the gap between the outer face 2a of the ceramic plate 2 and the outer surface of the adhesive layer 6 of the peripheral flange 5. Accordingly, in the fixed condition shown in figure 3, both the adhesive surfaces defined by the adhesive layer 6 and by the structural adhesive 14 are perfectly contacting the surface of the panel P.
  • the flexibility of the container 4, namely of its flange 5, enables accommodation, and thus a most efficient anchoring, of the piezo-electric actuator-transducer 1 even to panels P having a non perfectly planar configuration, i.e. with a curved and even crowned design.
  • the container 4 enables both to make application of the piezo-electric actuator-transducer 1 easier, and to achieve a particularly safe and reliable anchoring thereof in the applied condition. Additionally the container 4 provides efficient protection of the ceramic plate 2 in the fixed condition of the piezo-electric actuator-transducer 1 to the panel P.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Electrically Driven Valve-Operating Means (AREA)

Description

Field of the invention
The present invention is related to piezo-electric actuator-transducers for sound reproduction systems.
State of the prior art
More particularly, the invention is directed to sound reproduction system applications wherein the piezoelectric actuator-transducer defines a vibration means to be secured to a panel forming part of a structure and whose vibrations would normally constitute an undesired effect. Examples of these applications are disclosed and illustrated in WO 97/16048 in the name of the same Applicant (unpublished at the priority date of the present application), wherein the panel to which the piezo-electric actuator-transducer is applied consists of a vehicle body element. In these and similar applications the piezo-electric actuator-transducer comprises in a known way a thin ceramic plate having a securing face thereof to said panel and a pair of electrodes connected to the plate. In the above-mentioned prior document examples of how the piezo-electric actuator-transducer is secured to the vibrating panel are also provided, including the aid of a structural adhesive, normally a high elasticity modulus resin, layered onto the securing face of the piezo-electric actuator-transducer to the panel.
Statement of the invention
The present invention is directed to a novel and unique expedient enabling to enhance securing of the piezo-electric actuator-transducer both in connection to a safer and more reliable anchoring thereof, and as far as easier and more convenient fixing operation thereof are concerned.
According to the invention, this object is achieved primarily by virtue of the fact that the ceramic plate of the piezo-electric actuator-transducer is fitted within a substantially tray-like container made of a relatively flexible material, having a peripheral flange provided with an adhesive layer; a seat, surrounded by said peripheral flange and having a shape complementary to that of the ceramic plate, in which said ceramic plate is housed and fixed with the securing face thereof facing to the outside of the container and arranged in a lowered plane with respect to the adhesive layer of said peripheral flange; and a receptacle interposed between said peripheral flange and said seat for the ceramic plate.
The provision of the above container enables on one hand to effectively protect the piezo-electric actuator-transducer in its installed condition and on the other hand, due to its relatively flexible construction, to make securing operation of the ceramic plate (which is instead relatively rigid and fragile) easier even onto non perfectly planar, and even curved or crowned surfaces.
Moreover the receptacle provided between the peripheral flange of the container and the seat for the ceramic plate is able to further facilitate application of the piezo-electric actuator-transducer onto the related panel, since, upon adhesion of the adhesive layer of the peripheral flange of the container against the panel onto which the piezo-electric actuator-transducer is to be applied, any excess or squeezed amount of the structural adhesive layered over the securing face of the ceramic plate is allowed to pour into the receptacle, thus being received and captured thereby. Accordingly the adhesive surfaces of the peripheral flange and of the securing face of the ceramic plate are ensured to be arranged substantially at the same level, i.e. under perfect adhesive contact with the panel to which the piezo-electric actuator-transducer is secured.
The container may be conveniently closed by a covering sheet peelably adhering to the adhesive layer of said peripheral flange and to be removed prior to securing the piezo-electric actuator-transducer onto said panel.
The receptacle interposed between the peripheral flange and the seat for the ceramic plate of the container is advantageously designed as an annular channel, and according to a preferred embodiment of the invention this annular channel is communicating with said seat for the ceramic plate through passages arranged substantially at the same level of the securing face of the ceramic plate.
Depending upon the shape of the ceramic plate, the housing may be circular, quadrangular or even polygonal.
Moreover the flange of the container, which is normally made of moulded thermoplastic material, may be formed with a passage for outer wires connected to the electrodes of the piezo-electric actuator-transducer.
Brief descrprition of the drawings
The invention will now be disclosed in detail with reference to the accompanying drawings, purely provided by way of non limiting example, in which:
  • figure 1 is a rear perspective view of a piezo-electric actuator-transducer according to a preferred embodiment of the invention,
  • figure 2 is a front perspective view of the piezo-electric actuator-transducer,
  • figure 3 is a cross sectioned and enlarged view showing the piezo-electric actuator-transducer of figures 1 and 2 in its fixed condition to a vibrating panel, and
  • figure 4 is a perspective view showing the piezo-electric actuator-transducer immediately prior to fixing thereof to the panel such as shown in figure 3.
Detailed description of a preferred embodiment of the invention
Referring initially to figures 1 and 2, reference numeral 1 generally designates a piezo-electric actuator-transducer according to the invention, to be employed with a sound reproduction system comprising a sound pick-up or sound receiver apparatus, an amplifier apparatus and at least one vibrating-element sound emitter, formed by a panel or the like to which the piezo-electric actuator-transducer 1 is secured in the way which will be clarified herebelow.
The vibrating panel to which the piezo-electric actuator-transducer is to be secured, diagrammatically depicted as P in figure 3, may be constituted by a structural member of motor-vehicle body or by the shall of a helmet, or by the body of an illuminating apparatus or by any other element adapted to vibrate so has to produce sounds.
The piezo-electric actuator-transducer 1 is formed, according to the invention, by a thin ceramic plate 2 of a conventional type, provided also in a way known per se with a pair of electrodes (not shown) connected to outer wires 3, and by a container 4 within which the ceramic plate 2 is fitted and permanently fixed.
In the case of the shown example the ceramic plate 2 and the container 4 have a circular design: it is however to be pointed out that the shape of either one or both may be different, for instance quadrangular or polygonal.
The ceramic plate 2 may be for instance of the type produced and marketed by Hoechst AG under the trade name Sonox® P 51 and the like.
The container 4 has a generally cup or tray-like configuration and is made of a relatively flexible material, for instance a moulded thermoplastic material. The container 4 is formed with a peripheral annular flange 5 whose face intended to be placed into contact with the panel P is covered by an adhesive layer 6 which can be constituted, for instance, by a bi-adhesive annular film.
Innerly of the peripheral flange 5, the container 4 is formed with a lowered seat 7 having a shape complementary of that of the ceramic plate 2, within which this ceramic plate 2 is housed and fixed, in correspondence of its inner face, by means of an adhesive layer 8.
As better shown in figure 3, the depth of the seat 7 is greater than the thickness of the ceramic plate 2 added to the thickness of the inner adhesive layer 8, whereby the outer face of this ceramic plate 2, designated as 2a, is arranged in a lowered plane with respect to the outer surface of the adhesive layer 6 of the peripheral flange 5. The difference in height therebetween may be normally comprised between 0.05 and 0.03 mm, and is preferably about 0.1 mm.
Between the seat 7 and the annular flange 5, the container 4 is formed with a receptacle designed as an annular channel 9, which is also lowered with respect to the peripheral flange 5. This intermediate annular channel 9 is in communication with the seat 7 through passages arranged substantially at the same level as the outer face 2a of the ceramic plate 2. In the case of the shown example, these passages are formed by a number of radial grooves 10 provided on top of the wall delimiting the seat 7.
In correspondence of the seat 7, the container 4 may be formed with outer stiffening ribs 11. Moreover the back of the annular flange 5 is conveniently provided with an integral tunnel 12 passed through by the outer wires 3.
In the condition preceding its application, depicted in figures 1 and 2, the piezo-electric actuator-transducer 1 is provided with a cover sheet 13 adhering in a peelable way to the adhesive layer 6 of the peripheral flange 5, so as to overlay the outer face 2a of the ceramic plate 2.
Upon application of the piezo-electric actuator-transducer 1 onto the panel 2, the cover sheet 13 is removed (such as shown in figure 2), so as to expose the adhesive layer 6 and the outer face 2a of the ceramic plate 2.
Then a layer of structural adhesive 14, normally comprising a high elasticity modulus resin (for instance an epoxy resin) is deposited onto the outer face 2a, such as shown in figure 4.
Thereafter the piezo-electric actuator-transducer 1 is brought into contact against the panel P, adhering thereonto the adhesive layer 6 of the peripheral flange 5, as well as the structural adhesive layer 14 applied on the outer face 2a of the ceramic plate 2. At this stage, any excess or squeezed amount of the structural adhesive 14 pours through the passages 10 into the receptacle 9, thus being captured therein. This ensures the thickness of the structural adhesive 14 to be that necessary and sufficient to fill the gap between the outer face 2a of the ceramic plate 2 and the outer surface of the adhesive layer 6 of the peripheral flange 5. Accordingly, in the fixed condition shown in figure 3, both the adhesive surfaces defined by the adhesive layer 6 and by the structural adhesive 14 are perfectly contacting the surface of the panel P.
The flexibility of the container 4, namely of its flange 5, enables accommodation, and thus a most efficient anchoring, of the piezo-electric actuator-transducer 1 even to panels P having a non perfectly planar configuration, i.e. with a curved and even crowned design.
It will be apparent from the above that the container 4 enables both to make application of the piezo-electric actuator-transducer 1 easier, and to achieve a particularly safe and reliable anchoring thereof in the applied condition. Additionally the container 4 provides efficient protection of the ceramic plate 2 in the fixed condition of the piezo-electric actuator-transducer 1 to the panel P.
Naturally the details of construction and the embodiments may be widely varied with respect to what has been disclosed and illustrated, without thereby departing from the scope of the present invention such as defined in the appended claims.

Claims (10)

  1. Piezo-electric actuator-transducer (1) for sound reproduction systems in which said piezo-electric actuator-transducer (1) defines a vibration means to be secured to a panel (P) forming part of a structure such as a vehicle body or the like, and wherein said piezo-electric actuator-transducer (1) comprises a thin ceramic plate (2) having a securing face (2a) thereof to said panel (P) and a pair of electrodes (3) connected to said plate (2), characterized in that said ceramic plate (2) is fitted within a substantially tray-like container (4) made of a relatively flexible material, having a peripheral flange (5) provided with an adhesive layer (6); a seat, surrounded by said peripheral flange (5) and having a shape complementary to that of said ceramic plate (2), in which said ceramic plate (2) is housed and fixed with said securing face (2a) thereof facing to the outside of the container (4) and arranged in a lowered plane with respect to the adhesive layer (6) of said peripheral flange (5); and a receptacle (9) interposed between said peripheral flange and said seat (7) for the ceramic plate (2).
  2. Piezo-electric actuator-transducer according to claim 1, characterized in that said container (4) is closed by a covering sheet (13) peelably adhering to the adhesive layer (6) of said peripheral flange (5) and to be removed prior to securing the piezo-electric actuator-transducer (1) onto said panel (P).
  3. Piezo-electric actuator-transducer according to claim 1, characterized in that the container (4) is formed, in correspondence of said seat (7) for the ceramic plate (2), with outer stiffening ribs (11).
  4. Piezo-electric actuator-transducer according to claim 1, characterized in that said receptacle (9) has an annular channel design.
  5. Piezo-electric actuator-transducer according to claim 4, characterized in that said annular channel (9) is in communication with said seat (7) for the ceramic plate (2) through passages (10) arranged substantially at the same level of said securing face (2a) of the ceramic plate (2).
  6. Piezo-electric actuator-transducer according to claim 1, characterized in that said peripheral flange (5) of the container (4) is formed with a passage (12) for outer wires (3) connected to said electrodes.
  7. Piezo-electric actuator-transducer according to any of the preceding claims, characterized in that said container (4) has a circular shape.
  8. Piezo-electric actuator-transducer according to any of claims 1 through 6, characterized in that said container (4) has a quadrangular shape.
  9. Piezo-electric actuator-transducer according to any of claims 1 through 6, characterized in that said container (4) has a polygonal shape.
  10. Piezo-electric actuator-transducer according to any of the preceding claims, characterized in that said container (4) is made of moulded plastic material.
EP97930512A 1996-07-11 1997-07-08 Piezo-electric actuator-transducer for sound reproduction systems Expired - Lifetime EP0910848B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT96TO000589A IT1286162B1 (en) 1996-07-11 1996-07-11 PIEZOELECTRIC ACTUATOR-TRANSDUCER FOR SOUNDPROOFING SYSTEMS.
ITTO960589 1996-07-11
PCT/EP1997/003599 WO1998002871A1 (en) 1996-07-11 1997-07-08 Piezo-electric actuator-transducer for sound reproduction systems

Publications (2)

Publication Number Publication Date
EP0910848A1 EP0910848A1 (en) 1999-04-28
EP0910848B1 true EP0910848B1 (en) 2000-02-09

Family

ID=11414769

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97930512A Expired - Lifetime EP0910848B1 (en) 1996-07-11 1997-07-08 Piezo-electric actuator-transducer for sound reproduction systems

Country Status (5)

Country Link
EP (1) EP0910848B1 (en)
DE (1) DE69701291T2 (en)
ES (1) ES2142170T3 (en)
IT (1) IT1286162B1 (en)
WO (1) WO1998002871A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8963104B2 (en) 2011-08-05 2015-02-24 Nitto Denko Corporation Optical element for correcting color blindness
US8931930B2 (en) 2013-01-29 2015-01-13 Nitto Denko Corporation Optical element for correcting color blindness
US10191305B2 (en) 2015-12-30 2019-01-29 Signet Armorlite, Inc. Ophthalmic lens

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4393688A (en) * 1981-11-19 1983-07-19 General Motors Corporation Piezoelectric knock sensor
JPS59201511A (en) * 1983-04-28 1984-11-15 Toyo Commun Equip Co Ltd Structure of holder for piezoelectric device
JPS6429099A (en) * 1987-07-24 1989-01-31 Nitsuko Ltd Piezoelectric sounding body
US5185550A (en) * 1990-02-09 1993-02-09 Toyo Communication Equipment Co., Ltd. Structure for supporting a resonator using an ultrathin piezoelectric plate in a package
JPH06216692A (en) * 1993-01-14 1994-08-05 Murata Mfg Co Ltd Piezoelectric resonance component
EP0856238B1 (en) * 1995-10-20 1999-05-26 C.R.F. Società Consortile per Azioni Sound reproduction system for vehicles

Also Published As

Publication number Publication date
DE69701291D1 (en) 2000-03-16
DE69701291T2 (en) 2000-10-19
EP0910848A1 (en) 1999-04-28
ITTO960589A1 (en) 1998-01-11
ES2142170T3 (en) 2000-04-01
IT1286162B1 (en) 1998-07-07
ITTO960589A0 (en) 1996-07-11
WO1998002871A1 (en) 1998-01-22

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