H - Electricity – 04 – R
Patent
H - Electricity
04
R
349/72
H04R 9/06 (2006.01) H04R 7/14 (2006.01) H04R 9/04 (2006.01)
Patent
CA 1042544
BROAD-BAND ACOUSTIC SPEAKER Abstract of the Disclosure The present invention relates to an acoustic transducer. The transducer is comprised of a magnetic unit for producing an annularly shaped magnetic field including a cylindrical center pole member and a circular outer pole member disposed around an spaced from the center pole to form the annularly shaped magnetic field therebetween. A coil unit is provided forming an annularly shaped alternating current field disposed in the annularly spaced magnetic field for reciprocation axially of the center pole. One of the fields is continuous and the other field is divided into axially spaced rigidly interconnected subfields of substantially equal frequency response. The subfields are spaced such that as the current field moves in one direction relative to the magnetic field, one of the subfields is coupled to the one field to an increasing degree and the other of the subfields is coupled to the one field to a decreasing degree. As the current field moves in the other direction relative to the magnetic field, the one of the subfields is coupled to the one field to a decreasing degree and the other subfield is coupled to the one field to an increasing degree to thereby maintain a substantially constant degree of coupling between the two fields over a substantial distance of relative movement. An acoustic radiating surface is attached to and reciprocates axially with the coil unit and has an outer periphery. A rigid support member is attached to the magnetic unit and includes an annular flange disposed adjacent the outer periphery of the acoustic radiating surface. Finally, an axially flexible unit is provided having an annular air seal between the periphery of the radiating surface and the annular flange while providing radial alignment for the radiating surface. - 1 -
301687
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