Vibration transducers

Details Vibration transducers Vibration transducers

1998-05-13

2000-11-21

Kuntz, Curtis A.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

381152, 181142, H04R 2500

Patent

active

061514020

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. Technical Field
The invention relates to transducers and more particularly to vibration transducers for loudspeakers comprising panel-form acoustic radiating elements.
2. Background Art
It is known from GB-A-2262861 to suggest a panel-form loudspeaker comprising: formed of two skins of material with a spacing core of transverse cellular construction, wherein the panel is such as to have ratio of bending stiffness (B), in all orientations, to the cube power of panel mass per unit surface area (.mu.) of at least 10; body, in a free undamped manner; excite a multi-modal resonance in the radiator panel in response to an electrical input within a working frequency band for the loudspeaker.
U.S. Pat No. 4,506,117 of MULTIPHONIE discloses an electroacoustic transducer comprising an inertial mass adapted to be attached rigidly by its base plate to a panel to be vibrated.


DISCLOSURE OF INVENTION

Embodiments of the present invention use members of nature, structure and configuration achievable generally and/or specifically by implementing teachings of our co-pending parent application Ser. No. 08/707,012. Such members thus have capability to sustain and propagate input vibrational energy by bending waves in operative area(s) extending transversely of thickness often but not necessarily to edges of the member(s); are configured with or without anisotropy of bending stiffness to have resonant mode vibration components distributed over said area(s) beneficially for acoustic coupling with ambient air; and have predetermined preferential locations or sites within said area for transducer means, particularly operationally active or moving part(s) thereof effective in relation to acoustic vibrational activity in said area(s) and signals, usually electrical, corresponding to acoustic content of such vibrational activity. Uses are envisaged in co-pending, application Ser. No. 08/707,012 for such members as or in "passive" acoustic devices without transducer means, such as for reverberation or for acoustic filtering or for acoustically "voicing" a space or room; and as or in "active" acoustic devices with transducer means, such as in a remarkably wide range of sources of sound or loudspeakers when supplied with input signals to be converted to said sound, or in such as microphones when exposed to sound to be converted into other signals.
This invention is particularly concerned with active acoustic devices in the form of loudspeakers. Members as above are herein called distributed mode acoustic radiators and are intended to be characterised as in the above copending parent application and/or otherwise as specifically provided herein.
The invention is a vibration transducer for exciting a member having opposed faces and having capability to sustain and propagate input vibrational energy by bending waves in at least one operative area extending transversely of thickness comprising a motor coil assembly having a coil rigidly fixed to a tubular member, the motor coil assembly being adapted to be fixed to one face of the member at a surrounding attachment portion, and a magnet assembly having opposed pole pieces, the periphery of one of which pole pieces is arranged to be disposed within and adjacent to the motor coil assembly, and the periphery of the other of which pole pieces is disposed outside of adjacent to the motor coil assembly, and wherein the magnet assembly has a central attachment portion adapted to be rigidly attached to the said member to be vibrated, and the motor coil assembly surrounds and is spaced from the central attachment portion of the magnet assembly. A fastener may be provided for rigidly securing the magnet assembly to the member. The fastener is adapted to engage in a cavity in the member. The fastener may comprise a spacer for spacing the peripheries of the pole pieces from the said member. The vibration transducer may comprise complementary motor coil assemblies and magnet assemblies adapted for mounting on opposed faces of the said member, the fastener tying the centres of the magn

REFERENCES:
patent: 1778084 (1930-10-01), Nevin
patent: 3111187 (1963-11-01), Barlow
patent: 3430007 (1969-02-01), Thielen
patent: 3553392 (1971-01-01), Liebscher
patent: 3651283 (1972-03-01), Doschek
patent: 3728497 (1973-04-01), Komatsu
patent: 4392027 (1983-07-01), Bock
patent: 4720868 (1988-01-01), Hirano
patent: 5894263 (1999-04-01), Shimakawa et al.

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