An electro-acoustic transducer

Details An electro-acoustic transducer An electro-acoustic transducer

H - Electricity

04

R

H04R 9/10 (2006.01) H04M 1/03 (2006.01) H04R 11/06 (2006.01)

Patent

CA 2128010

2128010 9414292 PCTABS00032 This invention relates to electro-acoustic transducers such as is generally indicated at (10) and which comprise a body (11) defining a chamber (12), a plate (13) bearing a microphone or speaker (14) to which is attached a stalk (15), a diaphragm (16), connectable to the stalk (15), which extends substantially across the chamber (12), an end piece (17) and an end cap (18). The end piece (17) has a kidney-shaped recess (21) which provides the main communication path between subsidiary inlets/outlets (19) and a main inlet/outlet (20). When the channel (22) is closed off by the end cap (18) it is effectively in the form of a tube and constitutes a Thuras tube. The length of this path effectively creates a long discharge path between the wearer's ear and any earthable metal part within the transducer and hence protects against electric shock.

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