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1. (WO1998049866) LOW VOLTAGE PIEZOELECTRIC TRANSDUCER AND METHOD
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1998/049866 International Application No.: PCT/US1998/008560
Publication Date: 05.11.1998 International Filing Date: 28.04.1998
IPC:
B06B 1/06 (2006.01) ,H01L 27/20 (2006.01) ,H01L 41/09 (2006.01) ,H01L 41/22 (2013.01) ,H04R 17/00 (2006.01) ,H04R 17/08 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
06
GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
B
GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
1
Processes or apparatus for generating mechanical vibrations of infrasonic, sonic or ultrasonic frequency
02
making use of electrical energy
06
operating with piezo-electric effect or with electrostriction
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
L
SEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
27
Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
20
including piezo-electric components; including electrostrictive components; including magnetostrictive components
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
L
SEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
41
Piezo-electric devices in general; Electrostrictive devices in general; Magnetostrictive devices in general; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
08
Piezo-electric or electrostrictive elements
09
with electrical input and mechanical output
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
L
SEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
41
Piezo-electric devices in general; Electrostrictive devices in general; Magnetostrictive devices in general; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
22
Processes or apparatus specially adapted for the assembly, manufacture or treatment of piezo-electric or electrostrictive devices or of parts thereof
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
R
LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
17
Piezo-electric transducers; Electrostrictive transducers
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
R
LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
17
Piezo-electric transducers; Electrostrictive transducers
04
Gramophone pick-ups using a stylus; Recorders using a stylus
08
signals being recorded or played-back by vibration of a stylus in two orthogonal directions simultaneously
Applicants:
MATERIALS SYSTEMS INCORPORATED [US/US]; 53 Hillcrest Road Concord, MA 01742, US
Inventors:
BOWEN, Leslie, J.; US
NEAR, Craig, D.; US
Agent:
CRAIG, Frances, P. ; Owen J. Meegan & Associates 24 North Street Salem, MA 01970, US
Priority Data:
08/847,43528.04.1997US
Title (EN) LOW VOLTAGE PIEZOELECTRIC TRANSDUCER AND METHOD
(FR) TRANSDUCTEUR PIEZOELECTRIQUE A FAIBLE IMPEDANCE ET PROCEDE CORRESPONDANT
Abstract:
(EN) A transducer (10) including a ceramic body (11) having a base (13) and an array of tube-shaped piezoelectric or electrostrictive ceramic elements (12) integral with the base (13). A first electrode (16) contacts the tube wall (17) inner surface, while a second electrode (15) contacts the tube wall (17) outer surface and is electrically isolated from the first electrode (16) and from the lower surface of the transducer (10). The first electrode (16) extends onto the transducer lower surface (26) for electrical connection to a power source for driving the transducer (10) across the tube walls (12) for d31 mode vibration of the tube walls (17). A stiff cover plate (27) may be used to transmit the tube wall vibration to a desired medium. The ceramic base (13) may be removed if an electrically insulating layer (29) is provided between the elements at the lower surface of the transducer. The insulating layer (29) and tube wall (17) upper edges then electrically isolate the second electrode from the first electrode (16) and the transducer lower surface. In this alternative, the first (16) and second (15) electrodes are provided by a stiff conductive polymer matrix (42) filling the tube-shaped elements (12) and spaces between the elements.
(FR) L'invention concerne un transducteur (10) qui comprend un corps céramique (11) comportant une base (13) et un groupement d'éléments céramiques (12) piézoélectriques ou électrostrictifs en forme de tubes formant une seule pièce avec la base. Une première électrode (16) est en contact avec la surface intérieure de la paroi des tubes (17), et une seconde électrode (15) est en contact avec la surface extérieure de la paroi des tubes (17) tout en étant isolée électriquement de la première électrode (16) et de la surface inférieure du transducteur (10). La première électrode (16) s'étebd sur la surface inférieure (26) du transducteur en vue d'une connexion électrique à une source d'alimentation qui permet d'activer le transducteur (10) d'un bout à l'autre des parois de tubes (17) et d'imprimer à celles-ci un mode de vibration d31. Une plaque protectrice (27) rigide peut être utilisée pour transmettre la vibration des parois de tubes à un support voulu. La base céramique (13) peut être enlevée si on prévoit une couche d'isolation (29) électrique entre les éléments, sur la surface inférieure du transducteur. La couche d'isolation (29) et les bords supérieurs des parois de tubes (17) isolent ainsi électriquement la seconde électrode (15) de la première électrode (16) et de la surface inférieure du transducteur. Dans ce mode de réalisation, la première (16) et la seconde électrode (15) sont fournies par une matrice (42) polymère conductrice rigide remplissant les éléments en forme de tubes (12) et les espaces situés entre ces éléments.
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Designated States: JP
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: English (EN)
Filing Language: English (EN)