Abstract
Microspeaker modules within mobile phones need to be smaller to offer competitive acoustic performance. Generally, a microspeaker module consists of a speaker unit and an enclosure. Typically, microspeaker module design focuses on miniaturization of either the speaker unit or the enclosure individually, using the other part of the module as a design constraint. However, it is difficult to maintain suitable acoustic performance when the total volume (sum of the back volume and the speaker unit) is significantly reduced. We adopted an integrated design method to overcome this issue. The electromagnetic characteristics of microspeaker were analyzed using the finite element method (FEM). According to the FEM, the average axial electromagnetic force per current increased 29%, and the total volume decreased 31% for the integrated design, as compared to the conventional design while maintaining the same perfect acoustic characteristics. The simulation results indicated that the module resonance frequency and sound pressure level are maintained in the integrated design. Prototypes were constructed to experimentally verify the simulation results.
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