Electroacoustic transducer

Details Electroacoustic transducer Electroacoustic transducer

1996-07-22

2000-10-03

Pihulic, Daniel T.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4104

Patent

active

H00018759

ABSTRACT:
An electroacoustic transducer comprises a pair of active piezo electric membranes and a sleeve closed at its ends by the membranes to a form an enclosed rear volume of air. A case accomodates the assembly of sleeve and membranes and provides an enclosed front volume of air between its inner wall and the assembly. An opening in the case to the outside forms a sound pressure output. Each membrane comprises a sandwich of two active piezo layers on a substrate material. Very small thicknesses of the substrate and active piezo layers provides for a correct impedance match to the acoustic load in the ear when used in hearing aids.

REFERENCES:
patent: 3828143 (1974-08-01), Tims et al.
patent: 3882285 (1975-05-01), Nunley et al.
patent: 4156800 (1979-05-01), Sear et al.
patent: 4490640 (1984-12-01), Honda
patent: 4811816 (1989-03-01), Lin

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