Abstract: An earphone 1, which adopts the drum air power system the invention, includes at least a drum 5 composed of a drum-shaped casing 2, a front head 3 located on the front part of the casing 2, a rear head 4 located on the rear part of the casing 2, an inner-drum space 5a defined by the casing 2, the front head 3, and the rear head 4. Earphone 1 also comprises a driver unit 6 installed inside the drum 5 and equipped with an external sound conducting part 6a and an internal sound conducting hole 6b. The front head 3 and the rear head 4 resonate in response to driving by the driver unit 6 so that the low pitch sounds B and C are output in addition to the full range sound formed from the external sound conducting part 6a. This structure lowers the minimum resonance frequency and increases the sound pressure.

Abstract: An earphone is disclosed. The earphone comprises an external auditory meatus insertion member, a casing and a driver unit. At least a part of the external auditory meatus insertion member is insertable into an external auditory meatus. The external auditory meatus insertion member is attached to the casing. The driver unit is disposed within the casing to generate sounds. The casing includes a front space formed in front of the driver unit, a sound guide hole in communication with the front end of the front space to cause sounds to impinge on the external auditory meatus, and a rear space formed in the rear of the driver unit.

Abstract: An ear pad is made of a deformable material and mounted on an earphone, at least a tip of which is insertable into an ear. The ear pad comprises a cylindrical body portion and an elastically deformable portion. The cylindrical body portion has a sound guide hole formed therein, being adapted to cause a sound to impinge on the ear. The deformable portion is connected to a tip of the body portion and spreads from the tip toward a rear end of the body portion, and includes a plurality of slit-shaped openings radially extending therefrom. The body portion includes grooves axially extending therefrom, corresponding to the openings in the outer peripheral surface of the body portion. Each opening overlaps with a corresponding groove in cases where the elastically deformable portion is deformed and pressed against the outer peripheral surface of the body portion.

Abstract: An earphone 1, which adopts the drum air power system the invention, includes at least a drum 5 composed of a drum-shaped casing 2, a front head 3 located on the front part of the casing 2, a rear head 4 located on the rear part of the casing 2, an inner-drum space 5a defined by the casing 2, the front head 3, and the rear head 4. Earphone 1 also comprises a driver unit 6 installed inside the drum 5 and equipped with an external sound conducting part 6a and an internal sound conducting hole 6b. The front head 3 and the rear head 4 resonate in response to driving by the driver unit 6 so that the low pitch sounds B and C are output in addition to the full range sound formed from the external sound conducting part 6a. This structure lowers the minimum resonance frequency and increases the sound pressure.