Piezoelectric film sonic emitter
First Claim
1. A speaker device for emitting subsonic, sonic or ultrasonic compression waves, said device being comprised of:
- a generally hollow drum having a sidewall and first and second opposing ends;
a rigid emitter plate attached to the first end of the drum, said plate having an outer face oriented away from the drum and an inner face disposed toward an interior cavity of the drum, said emitter plate having a plurality of apertures extending between the outer and inner faces;
a thin piezoelectric film disposed across the apertures of the emitter plate;
electrical contact means coupled to the piezoelectric film for providing an applied electrical input;
pressure means coupled to the 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 thereby create a compression wave in a surrounding environment.
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Accused Products
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 the 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 thereby create a compression wave in a surrounding 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.
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Citations
25 Claims
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1. A speaker device for emitting subsonic, sonic or ultrasonic compression waves, said device being comprised of:
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a generally hollow drum having a sidewall and first and second opposing ends; a rigid emitter plate attached to the first end of the drum, said plate having an outer face oriented away from the drum and an inner face disposed toward an interior cavity of the drum, said emitter plate having a plurality of apertures extending between the outer and inner faces; a thin piezoelectric film disposed across the apertures of the emitter plate; electrical contact means coupled to the piezoelectric film for providing an applied electrical input; pressure means coupled to the 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 thereby create a compression wave in a surrounding environment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24)
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23. A system for indirectly generating at least one new sonic or subsonic frequency from at least two ultrasonic frequencies of different value, said system comprising:
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a generally hollow drum having a first end, a second end, and an intermediate sidewall; an emitter plate coupled to the first end of the drum and having an outer face and an inner face, said plate including a plurality of apertures extending from the inner face to the outer face; a back cover coupled to the second end of the drum and being disposed so as to seal the second end of the hollow drum; a electrically responsive membrane disposed on the emitter plate over the plurality of apertures; pressure means applied to the emitter plate and the membrane for distending the membrane at the apertures into an arcuate emitter configuration capable of generating a compression wave within an ultrasonic frequency range in response to an applied electrical input; and electrical input means coupled to the membrane for developing a vibration response at the plurality of apertures and associated arcuate emitter configurations, wherein the vibrations operate as an ultrasonic frequency emitter for concurrently propagating (i) a first ultrasonic frequency and (ii) a second ultrasonic frequency which interacts with the first ultrasonic frequency within a compressible transmission medium to propagate a difference frequency within a sonic bandwidth.
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25. A method for emitting compression waves, said method comprising the steps of:
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a) positioning a piezoelectric film over apertures within a rigid emitter plate supported at one end of a hollow drum, said plate having an outer face oriented away from the drum and an inner face disposed toward an interior cavity of the drum; b) applying isotropic tension across the piezoelectric film disposed across the apertures of the emitter plate; c) developing a biasing pressure with respect to the piezoelectric film at the apertures to distend the film into an arcuate emitter configuration capable of constricting and extending in response to variations in an applied electrical input at the piezoelectric film to thereby create a compression wave in a surrounding environment; and d) applying electrical input to the piezoelectric film to propagate a desired compression wave.
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Specification