The headphone preferably comprises a toroidal seal ring which rests against or surrounds the user's ear and is constituted of a soft, yielding, and preferably elastic material. The seal ring, with the headphone positioned on the head of a user, forms a coupling space between an active diaphragm, actuated by an electroacoustic transducer, and the auditory canal of the user's ear. This coupling space is substantially sealed from the exterior of the headphone, and is formed with at least one opening and preferably several openings each receiving a respective passive oscillatory diaphragm having a definite self-resonance. Each passive diaphragm is associated with a sound path leading therefrom to the open air, to the back side of the active transducer diaphragm, or to acoustically effective cavities. Respective acoustic frictional resistances are associated with each passive diaphragm. The arrangement of the passive diaphragms relative to the active transducer diaphragm may take various forms. The headphone principle is usable with so-called quadrophonic headphones, as well as under the chin headphones and headphones provided with artificial reverberation means such as coil springs.
An earphone without impulse noise and conductive hearing includes a loudspeaker having a first sound output end for producing a high intensive sound wave and a second sound output end for producing a low intensive sound wave, and an earphone housing which includes a housing body, a sound output hood and a sound collecting hood. The housing body has a first open-end, a second open-end and a receiving chamber therein for mounting the loudspeaker. A sound output hood, which has a plurality of meshes thereon, is positioned in front of the first sound output end of the loudspeaker. The sound collecting hood, which has a plurality of meshes thereon, is positioned in front of the second sound output end of the loudspeaker. In which, the high intensive sound wave produced at the first sound output end emits outside the housing body through the meshes of the sound output hood and returns between the second sound output end of the loudspeaker and the sound collecting hood inside the housing body through a sound inlet provided around the housing body. Thereby the high intensive sound wave and the low intensive sound wave are constructively and destructively interfered between the sound collecting hood and the second sound output end of the loudspeaker to form a combined sound wave with high-clarity sound interval to emit through the meshes of the sound collecting hood.
An earphone having a housing, a speaker unit accommodated in the housing and a duct formed in the housing to pass sound emanated from the rear surface of the speaker unit and in which a mesh subjected to water repellent treatment is provided within the duct.
A structure for earphones with multiple sound tracks, includes an earphone casing, at least one first speaker, a second speaker and an adjusting member. The earphone casing has a plurality of outer-sound holes on the outside portion thereof. The speakers are disposed in the earphone casing. The speakers face outwards. The adjusting member is disposed on the earphone casing. The adjusting member has a plurality of adjusting holes corresponding to the outer sound holes of the earphone casing so that the adjusting holes of the adjusting member and the outer sound holes of the earphone casing can be aligned or staggered to reduce the sound pressure and reduce the discomfort for a user, thereby reducing hearing damage and loss. Furthermore the device has the functions of earphones, a loud speaker, a sound box and an earphone device with multiple sound tracks.
Headphone earpieces which comprise each at least one electroacoustic transducer operating on the orthodynamic principle and including a small-mass diaphragm of an extension corresponding at least to that of an average auricle, with the coupling space of each of the earpieces being designed for a minimum reflection, are equipped with an ear cushion which, with the headphone in position of use, tightly encloses the coupling space toward the outside. The disadvantages of headphone with an orthodynamically driven diaphragm which have hitherto been used only with the coupling space tightly enclosed, may be eliminated by omitting the tight enclosure of the coupling space and effecting the coupling to the ear by means of an ear cushion (1) of reticulate foam material by which the coupling space is enclosed at least laterally and which, while resting against the ear (2) or the user's head, has an acoustic frictional resistance approximately of the order of magnitude of the transformed wave impedance of air, so that the diaphragm (3) oscillation is impeded predominantly by friction and the critical damping of the low-frequency resonance (70 to 300 Hz) of the diaphragm is insured.
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.
