Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF1 Cites 5 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Electrostatic loudspeakers
  • Electrostatic loudspeakers
  • Electrostatic loudspeakers

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com