US 4,928,312 AGranted

Acoustic transducer

OwnerAmel Hillinventor

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Abstract

An acoustic transducer loudspeaker for converting variations of electrical energy into corresponding variations of acoustic energy is formed of one piece of foamed polymer material having different densities in different portions thereof. The one piece of foamed polymer material has a periphery portion of one density and a diaphragm portion formed in the center thereof and a resilient diaphragm suspension portion separating the periphery porition from the diaphragm portion and having a flexible polymer insert attached in a recess over the diaphragm suspension portion. A voice coil is fixedly attached to the diaphragm portion and a frame is mounted to the foamed polymer sheet periphery portion and extends over the diaphragm portion to support a permanent magnet thereon for alignment with the voice coil. A laminated cover panel can be laminated to the front of the foamed polymer sheet to provide a speaker and a ceiling tile or wall panel without a visible grill.

Claims15

Dependent claims

An acoustic transducer comprising:

a one piece sheet of foamed polymer material having different densities in different portions thereof, said different portions comprising a periphery portion of a first density, a diaphragm portion of a second density formed in the center of said one piece sheet of foamed polymer material, and a resilient diaphragm suspension portion separating said periphery portion and said diaphragm portion and said resilient diaphragm suspension portion having a third density lower than said periphery portion density;
wherein said diaphragm portion has a plurality of reinforcing ribs formed thereon and has a foamed polymer surround ridge immediately adjacent said diaphragm suspension portion and intersecting said reinforcing ribs;
a groove immediately adjacent said ridge and formed by said periphery portion, said resilient diaphragm suspension portion and said ridge;
a resilient insert attached in said groove in said one piece sheet of foamed polymer material;
a voice coil former fixedly attached to said diaphragm portion;
at least one frame support portion formed on said periphery portion;
and
a frame attached to said frame support portion and extending over a portion of said diaphragm portion, said frame having a magnet attached thereto in a position to be aligned with said voice coil former whereby a panel speaker is formed.

5 more elements

Dependencies are inferred from the claim text.