Electro-acoustic transducer with high air permeable diaphragm

Details Electro-acoustic transducer with high air permeable diaphragm Electro-acoustic transducer with high air permeable diaphragm

1984-05-04

1986-04-15

Fuller, Benjamin R.

Acoustics

Diaphragm

Critically defined material or coating

181157, 181172, 1791155R, H04R 700

Patent

active

045821631

ABSTRACT:
An electro-acoustic transducer comprising a diaphragm (1) and means for shifting the high-frequency roll-off of the frequency-response characteristic of the transducer towards lower frequencies. This is accomplished by making the diaphragm (1) permeable to air, the permeability to air over the entire surface area of the diaphragm being such that at least a passage of 50 liters of air per second per square meter is obtained for a pressure difference of 200 Pa (=200 N/m.sup.2) between opposite sides of the diaphragm.

REFERENCES:
patent: 1917309 (1933-07-01), Leopold
patent: 2007750 (1935-07-01), Carlisle
patent: 2866515 (1958-12-01), Hunter
patent: 3930130 (1975-12-01), Boszor
patent: 4190746 (1980-02-01), Harwood et al.
patent: 4359132 (1982-11-01), Parker et al.

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