Large-excursion electroacoustic transducer

Details Large-excursion electroacoustic transducer Large-excursion electroacoustic transducer

H - Electricity

04

R

349/70

H04R 7/00 (2006.01) H04R 1/00 (2006.01) H04R 7/20 (2006.01) H04R 9/06 (2006.01)

Patent

CA 1211833

PHN 10378 22 7.10.82 ABSTRACT: Large-excursion electroacoustic transducer. An electroacoustic transducer comprises a dia- phragm (1), a magnet system (4) and a voice coil (3) ar- ranged on a voice-coil former (2) in an air gap (5) of the magnet system (4). The movement is transmitted be- tween the voice-coil former (2) and the diaphragm (1) via a lever mechanism. The lever mechanism comprises n lever devices (such as 6) which are arranged at an angle relative to each other (n ? 2). A lever device (6) com- prises a lever arm (9) which is coupled to a fulcrum (11) at the location of a first position (10) on the lever arm, to the voice-coil former (2) at the location of a se- cond position (13), and to the diaphragm (1) at the loca- tion of a third position (14). The lever mechanism mul- tiplies the excursion of the voice-coil former by a fac- tor, which factor is suitably greater than unity. This results in an electroacoustic transducer with a long stroke (in which large excursions of the diaphragm are possible). The lever mechanism by means of which a larger excursion is obtained may also be employed in other types of transducer, such as piezo-ceramic transducers. Suit- ably, the compliant element (25) formed by a zigzag bel- lows secured both to the outer circumference of the dia- phragm (1) and to the chassis (26) of the transducer and permitting the large excursion of the diaphragm, is con- structed so as to reduce the acoustic contribution of the compliant element to the output signal of the transducer, which contribution forms a distortion component in the output signal. (Figure 1b).

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