Headphone apparatus

Details Headphone apparatus Headphone apparatus

1991-04-04

1994-07-05

Kuntz, Curtis

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Plural or compound reproducers

381158, 381159, H04R 2500

Patent

active

053275071

ABSTRACT:
An inner-ear type headphone apparatus includes a diaphragm, a driving portion, a backside wall, and a sealed wall plane. A diaphragm backside space is formed between the diaphragm and the driving portion. The driving portion drives the diaphragm. A back cavity communicates with a diaphragm backside space. The back cavity is formed between the driving portion and the backside wall. There is a sound-absorbing space between the backside wall and the sealed wall plane. The backside wall is provided with through-holes communicating the back cavity with the sound-absorbing space. The sound absorbing space is separated from external space by the sealed wall plane. Sound output of low frequency range is enhanced for the user of the headphone apparatus, with satisfactory frequency characteristics maintained where there is no drop in sound output of middle frequency range. Also, the amount of leakage of unpleasant sound wave of high frequency range to external space is reduced.

REFERENCES:
patent: 4239945 (1980-12-01), Atoji et al.
patent: 4637489 (1987-01-01), Iwanaka et al.
patent: 4742889 (1988-05-01), Yamagishi

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