Loudspeakers comprising panel-form acoustic radiating elements

Details Loudspeakers comprising panel-form acoustic radiating elements Loudspeakers comprising panel-form acoustic radiating elements

1998-05-13

2001-12-04

Le, Huyen (Department: 2643)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Driven diverse static structure

C381S431000, C381S425000

Reexamination Certificate

active

06327369

ABSTRACT:

TECHNICAL FIELD
The invention relates to loudspeakers and more particularly to loudspeakers comprising panel-form acoustic radiating elements.
BACKGROUND ART
It is known from GB-A-2262861 to suggest a panel-form loudspeaker comprising:
a resonant multi-mode radiator element being a unitary sandwich panel 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 (&mgr;) of at least 10;
a mounting means which supports the panel or attaches to it a supporting body, in a free undamped manner;
and an electro-mechanical drive means coupled to the panel which serves to 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. 3,247,925 of WARNAKA discloses what purports to be a low frequency resonant panel loudspeaker mounted in a chassis and excited by an electromechanical transducer mounted on the chassis.
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 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 panel-form loudspeaker characterised by a member having capability to sustain and propagate input vibrational energy by bending waves in at least one operative area extending transversely of thickness to have resonant mode vibration components distributed over said at least one area and have predetermined preferential locations or sites within said area for vibration exciter means and having a vibration exciter mounted on said member at one of said locations or sites to vibrate the member to cause it to resonate forming an acoustic radiator which provides an acoustic output when resonating, and a baffle surrounding and supporting the radiator. A resilient suspension may be provided between the radiator and the baffle to support the radiator in the baffle. The resilient suspension may be of an elastomeric material. The vibration exciter may be mounted wholly and exclusively on the radiator. The baffle may be formed as an enclosure having an open backed front box portion adapted to be mounted on a wall or the like. The front box portion may be adapted to be mounted to align with a cavity in the wall. The radiator may comprise a lightweight core separating a pair of high modulus lightweight skins. A subwoofer may be mounted to the baffle. A tweeter may be mounted to the baffle.


REFERENCES:
patent: 1773910 (1930-08-01), Lane
patent: 3347335 (1967-10-01), Watters et al.
patent: 5025474 (1991-06-01), Tanaka et al.
patent: 5400407 (1995-03-01), Cassity et al.
patent: 37 30 305 C 1 (1989-03-01), None
patent: 2010637 (1979-06-01), None
patent: 2 219 712 A (1989-12-01), None
patent: WO 92/03024 (1992-02-01), None

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