Closed earphone construction

Details Closed earphone construction Closed earphone construction

1978-04-10

1979-07-03

Cooper, William C.

179181R, H04R 128

Patent

active

041601351

ABSTRACT:
An earphone comprises a housing including a partition plate with an opening containing a diaphragm. An annular cushion is secured to the periphery of the partition and engages around the wearer's ear to form a coupling space between the diaphragm and the ear. A back covering is connected to the partition defining a soundproof cavity between the partition and the back covering. A partial wall is spaced from the partition on a side opposite the diaphragm to define a first high restoring force cavity. A duct is connected from the restoring force cavity to the outside, and it encloses an air mass which acts as an acoustic mass.

REFERENCES:
patent: 4005278 (1977-01-01), Gorike
patent: 4071717 (1978-01-01), Fidi et al.

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