Piezoelectric full-range loudspeaker

Details Piezoelectric full-range loudspeaker Piezoelectric full-range loudspeaker

1995-08-11

1998-09-08

Chan, Wing F.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electrostrictive, magnetostrictive, or piezoelectric

381173, 381191, 310322, 310324, H04R 2500

Patent

active

058057269

ABSTRACT:
A thin, high-fidelity piezoelectric loudspeaker is disclosed which comprises: (a) first and second metal discs that are spaced apart; (b) at least one damping disc sandwiched between the first and second metal discs; (c) first piezoelectric disc affixed to the first metal disc on the opposite side of the damping disc; and (d) second piezoelectric disc affixed to the second metal disc on the opposite of the damping disc. The metal discs and the piezoelectric discs are electrically connected, respectively, via varnished wires. These improved piezoelectric loudspeakers can be most advantageously used in portable electronic devices such as notebook personal computers, electronic dictionaries, personal digital assistants, electronic Rolodexes.RTM., etc, where space, especially thickness, is often at a premium and high-fidelity, miniature-sized speakers are highly desired.

REFERENCES:
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patent: 4692942 (1987-09-01), Morgand
patent: 4807294 (1989-02-01), Iwata et al.
patent: 5031222 (1991-07-01), Takaya
patent: 5196755 (1993-03-01), Shields

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