Brevet : EP2816821 - DISPOSITIF DE CONVERSION ÉLECTROACOUSTIQUE DE TYPE PIÉZO-ÉLECTRIQUE
Titre
DISPOSITIF DE CONVERSION ÉLECTROACOUSTIQUE DE TYPE PIÉZO-ÉLECTRIQUE
N° et date de publication de la demande
EP2816821 - 24/12/2014
Type de la demande
A1
N° et date de dépôt
EP12868532.8 - 04/10/2012
N° et date de priorité
JP2012032890 - 17/02/2012
Classification CIB
Classification CPC
Famille de brevets
US2015008794A1 ; WO2013121477A1 ; JPWO2013121477A1 ; EP2816821A1
Abrégé
[PROBLEM TO BE SOLVED] Even when a shock due to a fall or the like is received, a piezoelectric element can be made resistant to damage, and the flatness of a frequency sound pressure characteristic can be improved. [SOLUTION] An outer periphery portion of a lower surface of a circular support plate 2, made of resin, is fixed to an upper surface of a ring-shaped frame 1. A circular through hole 3 is provided in the center portion of the support plate 2. An outer periphery portion of a lower surface of a circular metal plate 4 is fixed to a portion of an upper surface of the support plate 2 positioned at the circumference of the through hole 3. A groove 6 is provided in a ring shape and positioned inward from an outer periphery portion of an upper surface of the metal plate 4. A shock absorbing member 7, made of elastic materials such as a carbon-based material and poly urethane, is provided in the groove 6 of the metal plate 4. A piezoelectric element 8 is provided on a portion of the upper surface of the metal plate 4 positioned inward from the shock absorbing member 7, and a portion of an upper surface of the shock absorbing member 7 positioned on an inner periphery portion of the shock absorbing member 7 and at a circumference of the portion of the upper surface of the metal plate 4. Then, as a result of the presence of the shock absorbing member 7, even when a shock due to a fall or the like is received, the piezoelectric element 8 can be made resistant to damage, and the flatness of a frequency sound pressure characteristic can be improved.
INTERVENANTS
Déposant
NEC CASIO MOBILE COMMUNICATIONS, LTD. - 1753 SHIMONUMABE NAKAHARA-KU KAWASAKI-SHI KANAGAWA 211-8666 - JP
Titulaire
NEC CORPORATION - 7-1, SHIBA 5-CHOME MINATO-KU TOKYO 108-8001 - JP
Inventeur
ONISHI, YASUHARU KAWASAKI-SHI, KANAGAWA 2118666 - JP
MURATA, YUKIO KAWASAKI-SHI, KANAGAWA 2118666 - JP
KISHINAMI, YUICHIRO KAWASAKI-SHI, KANAGAWA 2118666 - JP
KOMODA, MOTOYOSHI KAWASAKI-SHI, KANAGAWA 2118666 - JP
Mandataire
BREVALEX - 95 RUE D'AMSTERDAM - 75378 PARIS CEDEX 8 - FR - N° Siren : 582120671
STATUT EN FRANCE : Déchu
Délivrance
22/02/2017
Date de constatation de déchéance
-
14/09/2020 (BOPI 2020-43)
Dernière annuité payée
13/09/2018
Quantième- N° de l'annuité payée
7
Date de paiement de la prochaine annuité
31/10/2019