Device and method for the excitation and/or damping and/or detection or structural oscillations of a plate-shaped device using a piezoelectric strip device
An apparatus and a method for the excitation and/or damping and/or detection of structural oscillations of a plate-shaped device by means of a piezoelectric strip device are described. The apparatus comprises a carrier device ( 1 ), at a distance from which the plate-shaped device ( 10; 10 a ) is disposed by way of a space ( 11 ), wherein the piezoelectric strip device ( 2; 2 a, 2 b; 2 a′, 2 b′, 2 c; 2 d, 2 e, 2 f; 2′; 2 g, 2 h; 2 i, 2 j; 2 k, 2 l, 2 m; 2 n ) includes a plurality of piezoelectric strip elements ( 2; 2 a, 2 b; 2 a′, 2 b′, 2 c; 2 d, 2 e, 2 f; 2′; 2 g, 2 h; 2 i, 2 j; 2 k, 2 l, 2 m; 2 n ), which each are connected to the carrier device ( 1 ) and to the plate-shaped device ( 10; 10 a ), wherein the strips ( 2; 2 a, 2 b; 2 a′, 2 b′, 2 c; 2 d, 2 e, 2 f; 2′; 2 g, 2 h; 2 i, 2 j; 2 k, 2 l, 2 m; 2 n ) can be excited into longitudinal changes, thereby causing the excitation and/or damping and/or detection of structural oscillations of the plate-shaped device ( 10; 10 a ), and wherein the piezoelectric strips ( 2; 2 a, 2 b; 2 a′, 2 b′, 2 c; 2 d, 2 e, 2 f; 2′; 2 g, 2 h; 2 i, 2 j; 2 k, 2 l, 2 m; 2 n ) are configured and connected to the plate-shaped device ( 10; 10 a ) such that the transmission of oscillations takes place in a substantially punctiform manner.
1. A device for at least one of exciting, damping and detecting structural vibrations of a plate-shaped device ( 10 ; 10 a ) using a piezoelectric strip device, ( 2 g , 2 h ), comprising:
a carrier device ( 1 ), from which the plate-shaped device ( 10 ; 10 a ) is separated via an intermediate space ( 11 );
in which the piezoelectric strip device ( 2 g , 2 h ) includes a plurality of piezoelectric strip elements ( 2 g , 2 h ), each of which is connected to the carrier device ( 1 ) and the plate-shaped device ( 10 ; 10 a );
in which the strip elements ( 2 g , 2 h ) are piezoelectrically excitable to undergo changes in length, thereby inducing the any of the exciting, the damping and the detecting of the structural vibrations of the plate-shaped device ( 10 ; 10 a );
in which the piezoelectric strip elements ( 2 g , 2 h ) are configured and connected to the plate-shaped device ( 10 ; 10 a ) in such a manner that the vibrations are transmitted in a substantially punctiform manner;
wherein the piezoelectric strip elements include a group of one or more piezoelectric strip elements ( 2 g , 2 h ) that includes a plurality of series-connected strip elements ( 2 g , 2 h ), in which a first end (E 1 ) of a first strip element ( 2 g ) and a first end (E 1 ) of a second strip element ( 2 h ) are connected to the carrier device ( 1 ), and in which a second end (E 2 ) of the first strip element ( 2 g ) and a second end (E 2 ) of the second strip element ( 2 h ) are connected to one another and to the plate-shaped device ( 10 ; 10 a ), thereby spanning a cavity ( 6 ) in a manner of a bridge; and
wherein the first strip element ( 2 g ) arches one part of the cavity ( 6 ) and the second strip element ( 2 h ) arches the other part of the cavity ( 6 ).
2. The device as recited in claim 1 , in which the device is designed to excite structural vibrations of the plate-shaped device ( 10 ; 10 a ), and it includes a loudspeaker function.
3. The device as recited in claim 2 , in which the plate-shaped device ( 10 ; 10 a ) is a cover of a mobile electronic device, in particular a portable computer.
4. The device as recited in claim 1 , in which a damping device (DE) is located in the intermediate space ( 11 ) for damping vibrations of the plate-shaped device ( 10 ; 10 a ).
5. A method for any of exciting, damping and detecting structural vibrations of a plate-shaped device ( 10 ; 10 a ) using a piezoelectric strip device ( 2 g , 2 h ) that connects the plate-shaped device ( 10 ; 10 a ) to a carrier device ( 1 ), from which the plate-shaped device ( 10 ; 10 a ) is separated via an intermediate space ( 11 ); in which the piezoelectric strip device ( 2 g , 2 h ) includes a plurality of piezoelectric strip elements ( 2 g , 2 h ), each of which is connected to the carrier device ( 1 ) and the plate-shaped device ( 10 ; 10 a );
wherein the piezoelectric strip elements include a group of one or more piezoelectric strip elements ( 2 g , 2 h ) that includes a plurality of series-connected strip elements ( 2 g , 2 h ), in which a first end (E 1 ) of a first strip element ( 2 g ) and a first end (E 1 ) of a second strip element ( 2 h ) are connected to the carrier device ( 1 ), and in which a second end (E 2 ) of the first strip element ( 2 g ) and a second end (E 2 ) of the second strip element ( 2 h ) are connected to one another and to the plate-shaped device ( 10 ; 10 a ), thereby spanning a cavity ( 6 ) in a manner of a bridge;
wherein the first strip element ( 2 g ) arches one part of the cavity ( 6 ) and the second strip element ( 2 h ) arches the other part of the cavity ( 6 );
wherein the piezoelectric strip elements ( 2 ; 2 a , 2 b ; 2 a ′, 2 b ′, 2 c ; 2 d , 2 e , 2 f ; 2 ′; 2 g , 2 h ; 2 i , 2 j ; 2 k , 2 l , 2 m ; 2 n ) are configured and connected to the plate-shaped device ( 10 ; 10 a ) in such a manner that the vibrations are transmitted in a substantially punctiform manner; and
wherein the piezoelectric strip elements ( 2 ; 2 a , 2 b ; 2 a ′, 2 b ′, 2 c ; 2 d , 2 e , 2 f ; 2 ′; 2 g , 2 h ; 2 i , 2 j ; 2 k , 2 l , 2 m ; 2 n ) are piezoelectrically excited to undergo changes in length, thereby inducing the any of the exciting, the damping and the detecting of the structural vibrations of the plate-shaped device ( 10 ; 10 a ).