Electrostatic loudspeakers

A technology of electrostatic speakers and speakers, applied in the direction of electrostatic transducer speakers, electrical components, etc., can solve the problems of not providing sound reproduction, not providing a given driving voltage, etc.

Active Publication Date: 2009-03-25
WARWICK AUDIO TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such speakers perform satisfactorily in many applications, however, do not provide the highest quality sound reproduction, or the loudest output for a given drive voltage

Method used

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  • Electrostatic loudspeakers
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  • Electrostatic loudspeakers

Examples

Experimental program
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Embodiment Construction

[0016] Refer below figure 1 and 2 A preferred embodiment of the loudspeaker 1 according to the invention is described. Loudspeaker 1 comprises a multilayer board consisting essentially of three or more layers of thin, flexible material, and more specifically an electrically insulating middle layer 2 sandwiched between top and bottom conductive outer layers 3 and 4 . The middle layer 2 is a polymer film optionally having a shaped surface with circular depressions (not shown) in contact with the top outer layer 3 . The top outer layer 3 comprises a thin polymer film provided with a metallization layer applied to its outer surface by known metallization processes such as vapor deposition. Although in figure 1 The top middle outer layer 3 is shown as a separate layer, this outer layer 3 may be replaced by a metallization layer applied to the rear surface of the middle layer 2 by a conventional metallization process.

[0017] The top outer layer 3 may be formed, for example, o...

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PUM

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Abstract

An electrostatic loudspeaker comprises a multi-layer panel (1) incorporating an electrically insulating middle layer (2) sandwiched between first and second electrically conducting outer layers (3, 4). A signal generator is provided for applying an alternating electrical voltage across the outer layers (3, 4) to initiate vibration due to variation of the electrostatic forces acting between the layers, thereby serving as a loudspeaker. Furthermore at least one of the outer layers (3, 4) is permeable to air displaced by such vibration. Such a loudspeaker can serve as a low cost audio loudspeaker which can be made lightweight and flexible or large-area 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, public-address systems, or in a notebook computer or mobile telephone.

Description

technical field [0001] This invention relates to electrostatic loudspeakers. Background technique [0002] Loudspeakers can generally be classified into three categories, namely electrostatic (coil and magnet), piezoelectric and capacitive. Electromagnetic speakers are used in many devices such as hi-fi systems, radios, televisions and computers. They produce high quality sound, are cheap to produce and are easy to place, however they have the disadvantage of being relatively bulky and they have limited control over the directivity of the sound produced. Although electromagnetic speakers can cover the range from sub-audio (10HZ) to the highest point of the hearing range (20HZ), if high-fidelity reproduction is required, usually two or three separate speakers are used together to span the entire audio frequency range. [0003] Loudspeakers based on the piezoelectric principle are currently having a considerable impact, since they can be used to produce relatively thin (a fe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R19/02
CPCH04R19/02H04R29/00
Inventor 安德鲁·彼特·麦德勒雷邓肯·罗伯特·比尔山
Owner WARWICK AUDIO TECH LTD
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