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1. WO1996019796 - DIRECTIONAL ACOUSTIC TRANSDUCER

Publication Number WO/1996/019796
Publication Date 27.06.1996
International Application No. PCT/GB1995/002894
International Filing Date 12.12.1995
Chapter 2 Demand Filed 17.07.1996
IPC
B06B 1/06 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
06GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
BGENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
1Processes or apparatus for generating mechanical vibrations of infrasonic, sonic or ultrasonic frequency
02making use of electrical energy
06operating with piezo-electric effect or with electrostriction
G10K 11/18 2006.01
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES;  METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
18Methods or devices for transmitting, conducting or directing sound
G10K 11/26 2006.01
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES;  METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
18Methods or devices for transmitting, conducting or directing sound
26Sound-focusing or directing, e.g. scanning
CPC
B06B 1/0685
BPERFORMING OPERATIONS; TRANSPORTING
06GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
BMETHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, ; e.g.; FOR PERFORMING MECHANICAL WORK IN GENERAL
1Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
02making use of electrical energy
06operating with piezo-electric effect or with electrostriction
0644using a single piezo-electric element
0662with an electrode on the sensitive surface
0681and a damping structure
0685on the back only of piezo-electric elements
G10K 11/18
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
18Methods or devices for transmitting, conducting, or directing sound
G10K 11/26
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
18Methods or devices for transmitting, conducting, or directing sound
26Sound-focusing or directing, e.g. scanning
Applicants
  • POWER, Jeffrey [GB]/[GB]
Inventors
  • POWER, Jeffrey
Agents
  • HOOPER, John, Peter, Lindesay
Priority Data
9425577.519.12.1994GB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) DIRECTIONAL ACOUSTIC TRANSDUCER
(FR) TRANSDUCTEUR ACOUSTIQUE DIRECTIONNEL
Abstract
(EN)
Many transducers suffer from the problem that the way they behave in response to actuating signals of different frequencies, and particularly their directional properties, or beamwidth, depends on their physical size and shape. What is required is a transducer which changes its effective size as a function of frequency, and the present invention proposes such a transducer in which the transducer element (11, 12, 13) - the active part of the transducer, such as the diaphragm in a loudspeaker - permits automatic frequency-sensitive control of the beamwidth by providing frequency-dependent 'shading' of the local response to the signal across the face of the element, using a resistive coating (11) in association with a capacitive layer (12, through which the currents representing that signal travel) such that the CR value of the combination varies over the surface of the element.
(FR)
L'inconvénient de nombreux transducteurs est que la manière dont ils se comportent en réponse à des signaux d'actionnement de fréquences différentes, et en particulier leurs propriétés directionnelles, ou largeur de faisceau, dépend de leur taille et de leur forme physiques. Il est donc nécessaire de mettre au point un transducteur dont la taille effective varie en fonction de la fréquence. La présente invention concerne un transducteur de ce type dans lequel l'élément transducteur (11, 12, 13) - la partie active du transducteur, telle que le diaphragme dans un haut-parleur - permet une commande automatique sensible à la fréquence de la largeur de faisceau en fournissant un 'estompage' dépendant de la fréquence de la réponse locale au signal, au niveau de la face de l'élément, à l'aide d'un revêtement résistant (11) en combinaison avec une couche capacitive (12) à travers laquelle le courant représentant ce signal circule, de telle manière que la valeur CR (constante de temps) de la combinaison varie sur la surface de l'élément.
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