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Piezoelectric film sonic emitter

A technology of piezoelectric film and emitter, which is applied in the direction of sound-generating devices, piezoelectric/electrostrictive transducers, piezoelectric/electrostrictive transducers, resonant transducers, etc., and can solve problems such as ineffectiveness of reinforcement

Inactive Publication Date: 2003-07-30
AMERICAN TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This abrupt shift from the transducer / air interface to the proposed use of gel media reinforces the understanding of the ineffectiveness of the prior disclosed techniques, at least for practical loudspeaker applications

Method used

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  • Piezoelectric film sonic emitter
  • Piezoelectric film sonic emitter
  • Piezoelectric film sonic emitter

Examples

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Embodiment Construction

[0047]Traditionally, the use of piezoelectric transducers in parametric arrays as loudspeaker elements has many limitations that have prevented many practical applications of the transducers in the acoustic and ultrasonic generation industries. These limitations include phase and frequency response inhomogeneities within larger transducer arrays. Distortion, output power reduction, and inadvertent beam steering often occur due to small changes in the transducer's resonant frequency and variable response to different frequencies within a broad frequency spectrum. Many of these limitations arise from the fact that typical loudspeaker arrays consist of multiple individual non-uniform transducers each wired to a common signal source. Each transducer is slightly different and operates autonomously in parallel or in series with respect to the other transducers.

[0048] The present invention creates consistency and uniformity within the array by providing a single film piezoelectri...

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Abstract

A speaker device for emitting subsonic, sonic or ultrasonic compression waves comprising a generally hollow drum, a rigid emitter plate attached to the drum, and a plurality of apertures formed within the plate which are covered by a thin piezoelectric film disposed across the emitter plate. A pressure source is coupled to drum for developing a biasing pressure with respect to the thin film at the apertures to distend the film into an arcuate emitter configuration capable of constricting and extending in response to variations in the applied electrical input at the piezoelectric film to therapy create a compression wave in a surronding environment. Parametric ultrasonic frequency input is supplied to the piezoelectric film to propagate multiple ultrasonic frequencies having a difference component corresponding to the desired subsonic, sonic or ultrasonic frequency range.

Description

technical field [0001] The present invention relates to compression wave generation. More specifically, the present invention relates to an apparatus and method for directly generating compression sound waves and compression ultrasound waves, and indirectly generating a new compression sound wave or compression ultrasound waves through the interaction of two compression ultrasound waves, the frequency difference of which is The frequency corresponding to the desired new compressed sound wave or compressed ultrasonic wave Background technique [0002] There are many attempts to reproduce sound without noise. The background art of loudspeaker technology using conventional loudspeakers with radiating elements is reviewed in detail in related patent application serial number 08 / 684311, which is hereby incorporated by reference. A disadvantage of such conventional loudspeakers is distortion due to the mass of the moving diaphragm or other radiating element. A related problem a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R17/00B06B1/06G10K15/02H04R3/00H04R17/10H04R23/00
CPCG10K15/02B06B1/0688H04R23/00H04R17/00H04R17/10H04R2217/03
Inventor 约瑟夫·O·诺里斯詹姆斯·J·克罗夫特三世艾伦·R·塞尔夫里奇皮埃尔·基里-亚库柏
Owner AMERICAN TECH
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