Electrostatic audio loudspeakers

Details Electrostatic audio loudspeakers Electrostatic audio loudspeakers

2006-08-22

2006-08-22

Kuntz, Curt (Department: 2614)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Having electrostatic element

C381S190000, C381S431000, C381S152000

Reexamination Certificate

active

07095864

ABSTRACT:
An electrostatic transducer, such as a loudspeaker or microphone, comprises a multi-layer panel (1) incorporating an electrically insulating middle layer (2) sandwiched between first and second electrically conducting outer layers (3, 4). At least one of the layers has a profiled surface (6) where it contacts the surface of another of the layers. Furthermore a signal generator is provided for applying an alternating electrical voltage across the first and second layers (3, 4) to initiate vibration due to variation of the electrostatic forces acting between the layers, thereby serving as a loudspeaker (or for detecting variation of such electrostatic forces due to received vibration in the case of a microphone). Such a transducer can serve as a low cost audio loudspeaker which can be made lightweight and flexible so as to render it suitable for a wide range of applications, for example to provide sound reproduction in a home environment without requiring any bulky enclosure, or in a notebook computer or mobile telephone.

REFERENCES:
patent: 5400414 (1995-03-01), Thiele
patent: 0 361 249 (1989-09-01), None
patent: 60-46196 (1985-03-01), None
patent: 98/35529 (1998-08-01), None

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