Electroacoustic transducer apparatus

Details Electroacoustic transducer apparatus Electroacoustic transducer apparatus

1989-12-04

1991-09-10

Isen, Forester W.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Plural or compound reproducers

381 686, 381 69, 181135, H04R 2500

Patent

active

050480928

ABSTRACT:
An electroacoustic transducer apparatus of a type that it is inserted into a cavum concha upon use. The electroacoustic transducer apparatus of the invention is applied to a headphone of a so-called in-the-eart type or so-called inner-ear type. This headphone is provided with an air passage portion formed through an elastic ring member attached to the outer peripheral portion of the housing so as to communicate the inside and outside portions of a concave portion of the cavum concha upon use. Accordingly, a certain amount of sound escapes to the outside, thereby obtaining the acoustic characteristics of substantially the same level from a low band to a high band regardless of the size of the user's ears.

REFERENCES:
patent: 3470328 (1969-09-01), Daniels
patent: 3702123 (1972-11-01), Macken et al.
patent: 4442917 (1984-04-01), Johnson
patent: 4532649 (1985-07-01), Bellafiore
patent: 4617429 (1986-10-01), Bellafiore
patent: 4646872 (1987-05-01), Kamon et al.
patent: 4729451 (1988-03-01), Brander et al.
patent: 4742887 (1988-05-01), Yamagishi

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