Electroacoustic transducer comprising a closing member for closi

Details Electroacoustic transducer comprising a closing member for closi Electroacoustic transducer comprising a closing member for closi

1998-03-02

2000-03-14

Le, Huyen

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Having acoustic wave modifying structure

381386, 381345, 379433, H04M 100

Patent

active

060383275

ABSTRACT:
In an electroacoustic transducer (1) having a diaphragm (17) and a voice coil (16) connected to the diaphragm (17) in the area of the rear volume (HV) and cooperating with a magnet system (9), and including a substantially annular closing member (30) for closing the rear volume (HV), the closing member (30) has an annular body (38) and a ring projection (39), which projects obliquely from the annular body (38) along its entire circumference and is movable against spring action, at least one passage (34, 35, 36, 37) of the closing member (30), this passage having been provided in order to realize an acoustic friction between the rear volume (HV) and the acoustic free space surrounding the transducer (1), terminating in the annular contact surface (32) of the annular body (38), this annular contact surface extending transversely to the transducer axis (2).

REFERENCES:
patent: 5231659 (1993-07-01), Abraham et al.

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