Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electrostrictive – magnetostrictive – or piezoelectric
Reexamination Certificate
2003-12-22
2009-11-17
Ensey, Brian (Department: 2614)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electrostrictive, magnetostrictive, or piezoelectric
C381S152000
Reexamination Certificate
active
07620193
ABSTRACT:
An acoustic transducer comprises an active element which changes in length along a first axis in response to an audiofrequency input signal, the element being mounted between an inertial mass and a foot which in use engages a surface whereby audiofrequency vibrations produced by the active element are transmitted to the surface, characterised in that the foot is hingedly connected to the inertial mass and the active element is located between the foot and the mass such that the angle between the first axis and the surface is less than 90°, in use.
REFERENCES:
patent: 2031789 (1936-02-01), Pierce
patent: 2621260 (1952-12-01), Sykes
patent: 3366748 (1968-01-01), Ashworth
patent: 3697790 (1972-10-01), Flint et al.
patent: 2001/0005417 (2001-06-01), Djahansouzi
patent: WO 02/076141 (2002-09-01), None
Aston Martin Geoffrey
Johnson David Anthony
Metheringham William John
Munns Neil
Smith Brian Douglas
Ensey Brian
Jackson & Walker, LLP
Newlands Technology Limited
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