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US 4,377,219 AGranted
Loudspeaker having apertured acoustic impedance frontal loading element
AssigneeHarman International Industries, Incorporated
InventorJohn A. King
Life of this patent
Estimating the term…
Abstract
A direct radiating dynamic loudspeaker has an apertured impedance frontal loading element for improving its acoustic impedance. A planar sheet of nonrigid, fibrous air-permeable material has an apertured area and is positioned in front of the diaphragm of the loudspeaker. The sheet of air-permeable material is supported only at its periphery. A sheet of acoustically transparent material is bonded to the sheet of air-permeable material to cover the apertured area.
Claims13
A direct radiating dynamic loudspeaker of the type having low mass diaphragm and magnet means, the improvement comprising:
- a substantially planar acoustic impedance means positioned in front of and covering the projected frontal area of said diaphragm, said impedance means being a nonrigid, fibrous air-permeable material supported only at the periphery thereof;
- said impedance means having an opening therein providing an acoustic mass;
- and
- a second sheet of acoustically transparent material covering said opening and being bonded to said impedance means.
1 more element
Dependencies are inferred from the claim text.