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1. WO2012076517 - ELECTROACOUSTIC TRANSDUCER WITH REDUCED LOSSES DUE TO TRANSVERSAL EMISSION AND IMPROVED PERFORMANCE DUE TO SUPPRESSION OF TRANSVERSAL MODES

Publication Number WO/2012/076517
Publication Date 14.06.2012
International Application No. PCT/EP2011/071900
International Filing Date 06.12.2011
IPC
H03H 9/02 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
9Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
02Details
H03H 9/145 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
9Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
02Details
125Driving means, e.g. electrodes, coils
145for networks using surface acoustic waves
CPC
H01L 41/047
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
41Piezo-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
02Details
04of piezo-electric or electrostrictive devices
047Electrodes ; or electrical connection arrangements
H03H 9/0222
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
9Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
02Details
0222of interface-acoustic, boundary, pseudo-acoustic or Stonely wave devices
H03H 9/02858
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
9Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
02Details
02535of surface acoustic wave devices
02818Means for compensation or elimination of undesirable effects
02858of wave front distortion
H03H 9/02881
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
9Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
02Details
02535of surface acoustic wave devices
02818Means for compensation or elimination of undesirable effects
02881of diffraction of wave beam
H03H 9/02992
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
9Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
02Details
02535of surface acoustic wave devices
02992Details of bus bars, contact pads or other electrical connections for finger electrodes
H03H 9/14532
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
9Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
02Details
125Driving means, e.g. electrodes, coils
145for networks using surface acoustic waves
14517Means for weighting
14529Distributed tap
14532Series weighting; Transverse weighting
Applicants
  • EPCOS AG [DE]/[DE] (AllExceptUS)
  • RUILE, Werner [DE]/[DE] (UsOnly)
  • MAYER, Markus [DE]/[DE] (UsOnly)
  • RÖSLER, Ulrike [DE]/[DE] (UsOnly)
  • HAUSER, Markus [DE]/[DE] (UsOnly)
  • BLEYL, Ingo [DE]/[DE] (UsOnly)
  • RIHA, Gerd [AT]/[DE] (UsOnly)
  • EGGS, Christoph [DE]/[DE] (UsOnly)
Inventors
  • RUILE, Werner
  • MAYER, Markus
  • RÖSLER, Ulrike
  • HAUSER, Markus
  • BLEYL, Ingo
  • RIHA, Gerd
  • EGGS, Christoph
Agents
  • EPPING HERMANN FISCHER PATENTANWALTSGESELLSCHAFT MBH
Priority Data
10 2010 053 674.107.12.2010DE
Publication Language German (DE)
Filing Language German (DE)
Designated States
Title
(DE) ELEKTROAKUSTISCHER WANDLER MIT VERRINGERTEN VERLUSTEN DURCH TRANSVERSALE EMISSION UND VERBESSERTER PERFORMANCE DURCH UNTERDRÜCKUNG TRANSVERSALER MODEN
(EN) ELECTROACOUSTIC TRANSDUCER WITH REDUCED LOSSES DUE TO TRANSVERSAL EMISSION AND IMPROVED PERFORMANCE DUE TO SUPPRESSION OF TRANSVERSAL MODES
(FR) CONVERTISSEUR ELECTRO-ACOUSTIQUE A PERTES REDUITES GRACE A UNE EMISSION TRANSVERSALE, ET DE MEILLEURE PERFOMANCE DUE A LA SUPPRESSION DE MODES TRANSVERSAUX
Abstract
(DE)
Die vorliegende Erfindung betrifft einen elektroakustischen Wandler, der in einer akustischen Spur (AS) und auf einem piezoelektrischen Substrat (11) angeordnet ist und der zwei auf dem Substrat (11) angeordnete Elektroden (1, 2) aufweist, die ineinander greifende Elektrodenfinger (3, 4) zur Anregung von akustischen Wellen aufweisen. Die Elektrodenfinger (3, 4) einer Elektrode (1, 2) sind miteinander verschaltet. Der Wandler weist ferner Mittel zur Erhöhung der Massenbelegung in einem zentralen Anregungsbereich (ZAB), der parallel zur akustischen Spur (AS) verläuft, auf, und die Massenbelegung in dem zentralen Anregungsbereich (ZAB) ist höher als in einem Randbereich (RB), der sich von beiden Seiten an den zentralen Anregungsbereich (ZAB) anschließt.
(EN)
The present invention relates to an electroacoustic transducer which is arranged in an acoustic track (AS) and on a piezoelectric substrate (11) and which has two electrodes (1, 2) which are arranged on the substrate (11) and which have interengaging electrode fingers (3, 4) for exciting acoustic waves. The electrode fingers (3, 4) of an electrode (1, 2) are interconnected. The transducer also has means for increasing the mass occupation in a central excitation region (ZAB) which runs parallel to the acoustic track (AS), and the mass occupation in the central excitation region (ZAB) is higher than in an edge region (RB) which adjoins the central excitation region (ZAB) from both sides.
(FR)
L'invention concerne un convertisseur électro-acoustique disposé dans une voie acoustique et sur un substrat piézoélectrique (11), qui présente deux électrodes (1, 2) agencées sur le substrat (11), présentant deux électrodes allongées (3, 4) permettant l'excitation d'ondes acoustiques. Les électrodes allongées (3, 4) d'une électrode (1, 2) sont interconnectées. Le convertisseur présente, en outre, des moyens pour augmenter la masse surfacique dans une zone d'excitation centrale (ZAB), orientée parallèlement à la voie acoustique (AS), la masse surfacique dans la zone d'excitation centrale (ZAB) située dans le prolongement de la zone d'excitation centrale (ZAB) étant supérieure à celle dans une zone périphérique (RB).
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