Electrodynamic loudspeaker for low and medium sound frequencies

Details Electrodynamic loudspeaker for low and medium sound frequencies Electrodynamic loudspeaker for low and medium sound frequencies

1982-03-03

1984-09-18

Pellinen, A. D.

Acoustics

Anatomic or prosthetic relation

Ear and mouth

1791155R, 1791155DV, 179180, 179181R, 181144, 181153, 181173, 381 88, 381 89, H04R 906, H04R 128, H04R 712, H04R 720

Patent

active

044726058

ABSTRACT:
An electrodynamic loudspeaker radiates sound in all directions and with a high output for a low and medium sound frequencies. It comprises two hemispherical movable diaphragms which are arranged on either side of a disc-shaped carrier part. The diaphragms are connected with the carrier part by flanges and constitute a pulsating sphere. In this sphere and connected in each case with one of the diaphragms are actuating units with permanent magnets and in each case, an oscillatory coil. Each oscillatory coil is connected to its respective diaphragm through stiff transition parts, preferably in the form of spherical shells. Openings are provided for an atmospheric pressure equalization between the interior and exterior of the breathing sphere.

REFERENCES:
patent: 3456755 (1969-07-01), Walker
patent: 4176249 (1979-11-01), Inanaga et al.

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