Loudspeaker using wall as diaphragm

Claim 1

An electroacoustic transducer comprising: enclosure means including: a unitary case member having a planar surface, each edge of the planar surface flared to form a side surface extending transverse and substantially at right angles with the planar surface and having a first edge opposite the junction of the side surface and the planar surface and lying in a plane substantially parallel with the plane of the planar surface and having second and third edges transverse the planar surface, each side surface extending in the same direction from the planar surface, the second edge of each side surface smoothly joined to the third edge of an adjacent side surface, the first edge of each side surface flared to form a flange surface, all flange surfaces lying in the same plane substantially parallel with the plane of the planar surface and adapted for attachment to a supporting surface; a planar base member lying in a plane substantially parallel with the plane of the planar surface and joined to the side surfaces to define an enclosed area; the enclosed area having therewithin: a. magnet means connected to said base member and including an airgap; b. coil means; c. connecting means for connecting said coil means to an electronic amplifier; and d. coil support means having a first end with said coil means attached thereto and having a second end; said coil support means movably supporting said coil means within the airgap of said magnet means; said coil support means second end connected to the planar surface at substantially the center thereof to enable the planar surface, said coil support means and said coil means to move together with respect to said base member and said magnet means; whereby when the flange surfaces are attached to a supporting surface and said connecting means is connected to an electronic amplifier to cause audio frequency electrical signals to flow through said coil means within the airgap, corresponding audio frequency vibration signals are caused in the planar surface, said flange surfaces and the supporting surface, with the planar surface providing audio reproduction of higher audio frequency signals and the supporting surface providing audio reproduction of lower audio frequency signals.