Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having electrostatic element
Patent
1988-10-17
1990-05-22
Ng, Jin F.
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Having electrostatic element
381202, 381205, 181174, H04R 706, G10K 1300
Patent
active
049283120
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.
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patent: 4330691 (1982-05-01), Gordon
Chan Wing F.
Hobby III William M.
Ng Jin F.
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