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US 4,058,688 AGranted
Headphone
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYasutake Nishimura, Mitsuhiro Hasegawa
Life of this patent
Estimating the term…
Abstract
A headphone capable of attaining binaural hearing giving substantially the same sound quality as one would expect from ordinary loudspeakers, said headphone having such sound pressure versus frequency characteristics that there are two peaks between 1.5 and 5 KHz and the level differences between the low level area and the peaks are limited within the range of 6 to 17 dB. The headphone leads the sound from a transducer through the outside as well as inside of the headphone to the ears.
Claims5
Headphone apparatus comprising:
- a head band;
- a pair of headphones, one of said headphones being attached to one end of said head band and the other attached to the opposite end of said head band, each of said headphones including
- a headphone case having a plurality of perforations provided through the rear surface thereof;
- a baffle plate coupled to said headphone case;
- a transducer unit attached to said baffle plate, said transducer unit comprising a vibrator element, a magnetic field producing element including a through hole extending through the center thereof and a first damper material provided between one end of said magnetic field producing element adjacent said through hole and said vibrator element;
- a second damper material located within said headphone case;
- and
- a cover positioned in the front of said transducer unit, said cover having an air-permeable ear pad including a plurality of through holes therein, the acoustic resistances and inertances of said headphone being so established that the sound pressure versus frequency characteristics of said headphones are such that there are two peaks between 1.5 and 5 KHz and the level differences between the low level area and the peaks are limited within the range of 6 to 17 dB.
5 more elements
Dependencies are inferred from the claim text.