Open-air type earphone

Details Open-air type earphone Open-air type earphone

1987-02-12

1988-05-10

Fuller, B. R.

Acoustics

Anatomic or prosthetic relation

Ear and mouth

181160, 381 68, 381 69, 381154, 381158, 381159, 381187, H04R 2500

Patent

active

047428872

ABSTRACT:
An earphone has a housing divided by a driver unit into front and back cavities with a sound generation opening at the front thereof, a duct extending from the back cavity of the housing and having a length substantially larger than its diameter, and a casing attached to the housing and communicating with the back cavity through a pipe having a length longer than its diameter, with the resonant frequency determined by the casing and pipe being made near to the resonant frequency determined by the equivalent mass of the vibration system, that is, the diaphragm and voice coil of the driver unit, and by the compliance of the back cavity, so that the lowest resonant frequency of the earphone can be lowered while the peak that would otherwise be formed in the frequency characteristic of the earphone by the resonance between the back cavity and mass of the vibration system can be supressed for improving the high frequency characteristic.

REFERENCES:
patent: 3246721 (1966-04-01), Martin
patent: 4239945 (1980-12-01), Atoji et al.
patent: 4637489 (1987-01-01), Iwanaka et al.

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