(19)
(11) EP 1 133 212 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.01.2006 Bulletin 2006/02

(43) Date of publication A2:
12.09.2001 Bulletin 2001/37

(21) Application number: 01202058.2

(22) Date of filing: 27.02.1998
(51) International Patent Classification (IPC): 
H04R 7/10(2006.01)
(84) Designated Contracting States:
AT BE CH DE DK ES FI FR GB IE IT LI NL PT SE
Designated Extension States:
LT LV RO SI

(30) Priority: 04.03.1997 GB 9704486

(62) Application number of the earlier application in accordance with Art. 76 EPC:
98907080.0 / 0965245

(71) Applicant: New Transducers Limited
Huntingdon, Cambs PE29 6FW (GB)

(72) Inventors:
  • Azima, Henry
    Cambridge CB2 2TT (GB)
  • Harris, Nell
    Whitlestord, Cambridge CB2 4 NL (GB)
  • Colloms, Martin
    London NW2 2DA (GB)

(74) Representative: Evens, Paul Jonathan et al
Maguire Boss, 5 Crown Street
St. Ives, Cambridgeshire PE27 5EB
St. Ives, Cambridgeshire PE27 5EB (GB)

   


(54) Acoustic device


(57) A loudspeaker drive unit actuator (105) for driving a diaphragm (100) comprising

a compliant coupling part (107) adapted to drive the diaphragm (100) pistonically at lower frequencies at a pistonic drive point which is predominantly at the centre of the actuator and

a rigid coupling part (109) which is at a location offset from the compliant coupling part and which is adapted to drive the diaphragm to excite resonance in the diaphragm (100) at higher frequencies at a bending wave excitation point which is offset from the centre of the actuator.









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