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 1042543
BROAD-BAND ACCOUSTIC SPEAKER Abstract of the Disclosure The present invention relates to an acoustic driver. The driver is comprised of a magnetic unit forming an annular flux gap having an axis. A tubular coil form having a voice coil located thereon is disposed in the flux gap for reciprocation coaxially with the flux gap. A thin acoustic radiating membrane is fastened to the coil form and has an axis which is coaxial with the axis of the flux gap and the coil form. Finally, a plurality of rib members are provided, coupled to the coil form and radiating outwardly from the coil form. Each rib member is coupled along its length to the membrane so as to transmit acoustic energy at frequencies above about 8,000 cycles per second to the adjacent portion of the membrane. Each rib is fabricated from a material of high rigidity and has its major cross sectional dimension disposed substantially at a right angle to the membrane surface. Each rib has a longitudinal transmission velocity at least near the coil form for acoustic vibrations parallel to the axis of reciprocation between 8,000 cycles per second and 16,000 cycles per second that is equal to the velocity of acoustic energy in standard air. - 1 -
301686
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