Drnc Holdings, Inc.

Alcatel

Tcl Communication Technology Holdings Limited

Imerj, Ltd.

Stephane Dufosse

Gerard Douhet

Alain Guillotin

Jean-Christophe Villain

Eric Menu

Denis Abraham

Yves Lebaudour

The invention concerns a mobile terminal with at least two transducers (LSm, LSs, LSS) used simultaneously as loudspeakers for stereophonic effect. According to the invention, one of said transducers is a main transducer (LSm) with a main working frequency band (Bm) corresponding to at least the phone frequency band, while the other transducer is a secondary transducer (LSs; LSs) with a secondary working frequency band (Bs; Bs) band different from said main frequency band, the lowest frequencies of said secondary working frequency band (Bs; Bs) being greater than the lowest frequencies of said main working frequency band.

Mobile terminal with at least two transducers

In a structural arrangement for radio communication terminals comprising a casing in which are disposed at least a first sound transducer having an earpiece function and a second sound transducer having a loudspeaker function, the two transducers being respectively connected to two opposite faces of a printed circuit card, and each transducer comprising at least one resonating membrane vibrating in a front acoustical cavity and a rear acoustical cavity. The rear acoustical cavities of the transducers communicate with each other via orifices formed in the printed circuit card to form a twin rear acoustical cavity.

Structural arrangement for a radio communication terminal incorporating a loudspeaker and an earpiece

A telephone handset includes a housing containing an earpiece part including a piezo-electric disk joined to an electrically conductive support disk, the edge of the support disk being clamped between two holding parts and separating a rear volume from a front volume. The rear volume is delimited by the combination of the piezo-electric disk and its support disk and by a rear wall facing this combination and a circular lateral wall, the rear wall and the lateral wall constituting a rear part with micro-leaks to constitute with the rear volume an acoustic damper device. The front volume, on the other side of the aforementioned combination constitutes, with holes in a wall of the front volume facing the latter combination, a Helmoltz resonator. The housing further contains a board supporting electronic components in direct contact with the rear wall of the rear volume.

Piezo-electric speaker capsule for telephone handset

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Cormeilles en Parisis, France

Stephane Dufosse