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. 2013 Dec;134(6):4372.
doi: 10.1121/1.4824815.

Magnetostrictive microelectromechanical loudspeaker

Thorsten S Albach  1 , Reinhard Lerch  1
Affiliations

Magnetostrictive microelectromechanical loudspeaker

Thorsten S Albach et al. J Acoust Soc Am. 2013 Dec.

Abstract

A microelectromechnical-loudspeaker based on the magnetostrictive effect is presented. The membrane consists of a comb structure of monomorph bending cantilevers with an area of about 16 mm(2). Prototypes generate a sound pressure level (SPL) of up to 102 dB at 450 Hz with a total harmonic distortion of 2% inside a 2 cm(3) measurement volume. The fabrication process of the device as well as a coupled simulation model to calculate its sound pressure is introduced. The model reproduces the measurements and is employed to further optimize the loudspeaker membrane. As a result, a computed maximum SPL of 106 dB has been achieved with a -6 dB frequency range extending from 100 Hz to 2.6 kHz.

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