Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having protective or sheilding feature
Patent
1987-03-20
1989-03-28
Caldwell, Sr., John W.
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Having protective or sheilding feature
381169, 379420, 379437, 379440, 307400, H04R 128, H04R 718
Patent
active
048171646
ABSTRACT:
A holder for an electret microphone of the type having a front acoustic aperture and peripheral acoustic apertures is made of insulating material and includes a first sleeve portion of a diameter to receive the microphone snugly and a second sleeve portion of larger diameter. An internal stop limits the extent to which the microphone can be inserted such that the rear portion of the microphone projects into the second sleeve portion. Through holes in the second sleeve portion provide an acoustic passage to the peripheral acoustic apertures. The internal stop is in one embodiment formed by an apertured web. In another embodiment an internal shoulder forms the stop but in that embodiment too an apertured web is provided. A concentric small cylinder extends from the web in that case and terminates short of the shoulder. In either embodiment, a rectangular plate is molded with the sleeves and this forms the cover of a microphone enclosure. The invention retains or enhances the acoustic response of conventional mounting system while providing protection against electrostatic discharge.
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Fujita et al., Model S-1P Loudspeaker Telephone Set Design and Construction, Review of Electrical Communications Laboratories, vol. 27, Nos. 5-6 May, Jun. 1979.
Bertignoll Friedrich
Pocock Mark W.
Bell-Northern Research Limited
Caldwell Sr. John W.
Northern Telecom Limited
Queen Tyrone
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