Nxp B.v.

Knowles Electronics Asia Pte. Ltd.

Sound Solutions International Company, Ltd.

Knowles Ipc (M) Sdn. Bhd.

Susanne Windischberger

Josef Lutz

Ewald Frasl

Helmut Wasinger

Erich Klein

Maria Papakyriacou

Josefc/o Nxp Semiconductors Austria Gmbh Lutz

A speaker comprises a permanent magnet () and a coil () positioned around the permanent magnet () and attached to a membrane (), wherein the membrane comprises an elastomer of thickness less than 0.3 mm and with a Young's modulus below 100 MPa.

Micro speaker

A moving system () for a piezoelectric speaker () may include a membrane () and a piezoelectric layer () attached thereto, wherein a movement of the moving system () in a main direction (MD) is substantially caused by dilatation/contraction of the piezoelectric layer () transverse to the main direction (MD). To provide an advantageous frequency response of the moving system (), it is built up asymmetrically with respect to the moving characteristics. Accordingly, the modes are frequency shifted on the one hand and of less influence on the other. Hence, the frequency response of an inventive speaker () has less elevations and depressions in the frequency response. In a preferred embodiment the local compliance and/or the shape of the moving system () is asymmetric with respect to any point in the plane of the moving system ().

Asymmetrical moving systems for a piezoelectric speaker and asymmetrical speaker

A compound membrane () for an acoustic device (), the compound membrane () comprising a first layer () and a second layer (), wherein a value of Young's modulus of the second layer () does not vary more than essentially 30% in a temperature range between essentially &#x2212;20&#xb0; C. and essentially +85&#xb0; C.

Compound membrane, method of manufacturing the same, and acoustic device

An acoustic device (), comprising an oscillatory membrane () which comprises a transducing element () and a frame () adapted for accommodating the membrane () in an accommodation plane, wherein the membrane () is accommodated in the frame () in such a manner that a translational motion of the membrane () in at least one direction of the accommodation plane is made possible.

Acoustic device and method of manufacturing same

A membrane for an electroacoustic transducer is disclosed having a first area, a second area, which is arranged for translatory movement in relation to said first area, and a third area, which connects said first area and said second area, wherein local, planar spring constants along a closed line within said third area encompassing said second area, are determined in such a way that local, translatory spring constants along said line in a direction of said translatory movement are substantially constant or exclusively have substantially flat, mutual changes.

Membrane for an electroacoustic transducer

A membrane () for an electroacoustic transducer () is disclosed having a first area (A), a second area (A), which is arranged for translatory movement in relation to said first area (A), and a third area (A), which connects said first (A) and said second area (A), wherein local, planar spring constants (psc) along a closed line (L) within said third area (A) encompassing said second area (A), are determined in such a way that local, translatory spring constants (tsc) along said line (L) in a direction (DM) of said translatory movement are substantially constant or exclusively have substantially flat, mutual changes.

A membrane () for an electroacoustic transducer () is disclosed, wherein a thickness (d) of said membrane () and an average Young's modulus (Eavg) of said membrane () are chosen in such a way that the critical load (Fbc), which causes the membrane () to buckle and/or crinkle, is increased compared to a reference membrane. The reference membrane made of Polycarbonate has the same shape, dimension, and stiffness in its direction of movement (MOV) as said membrane (). According to the result of investigations on buckling and/or crinkling, said effect occurs with different critical buckling/crinkling loads for membranes of the same shape and dimension, but made of different materials, even when the stiffness of the membranes in their direction of movement&#x2014;and hence their resonant frequency&#x2014;is identical.

Growing community of inventors

Vienna, Austria

Susanne Windischberger