Miniature multi-loudspeaker module

Abstract

The present invention provides a miniature multi-loudspeaker module with a housing, comprising a magnetic circuit comprising magnetic means and a magnetically conducting body arranged to define a magnetic field, first and second diaphragm and coil assemblies that are separately movable, and wherein the first and second diaphragms extend in substantially the same plane. The module further comprises a front cover attached to the housing, the front cover comprising first and second sound outlet openings each being in acoustical connection with at least respective ones of the first and second diaphragms. In preferred embodiments at least parts of the magnetic circuit can be shared by the first and second diaphragm and coil assemblies, however separate magnetic circuits may be preferred that are fixed together by insert molding. Preferred embodiments have two diaphragm and coil assemblies that can be separately electrically terminated so as to enable stereo sound reproduction and can be operated out of phase to serve as a vibration source. Such loudspeaker modules may be utilized for providing stereo sound in, e.g. mo-bile phones. The front cover may in addition comprise a receiver sound outlet opening. Thus, the loudspeaker module may further serve as a receiver in a mobile phone. The receiver signal can either be generated by the two diaphragms or by a separately movable third diaphragm and coil assembly.

Description

field of invention [0001] The invention relates to the field of microspeaker module devices. In particular, the present invention relates to miniature multi-speaker modules suitable for integration into mobile terminals such as mobile phones and other portable communication and audio devices. The miniature multi-speaker according to the invention provides at least two independently operated loudspeakers which can be adapted for stereophonic reproduction. Background of the invention [0002] Mobile terminals such as mobile phones, PDAs, handheld gaming devices or portable audio devices etc. are usually equipped with audio sound reproduction systems capable of providing stereo sound at least in part of the audible frequency range. Generally, the sound reproducing system includes at least two independent speakers provided in a peripheral portion of a mobile terminal or device to reproduce stereo images. Therefore, the manufacturing process of such a mobile device comprising a...

AI Technical Summary

Problems solved by technology

However, the configurations indicated in US4,764,961 and JP62071399 all suffer from sound leakage in a direction substantially perpendicular to the plane defined by the plurality of vibrating plates

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