Abstract: The casing device provides at least a fastening element arranged on the outer surface of the main member of a wired single-ear headset. At least one of the fastening elements should be located above the cable opening on the main member. As such, by fixing the signal cable in one or more of the fastening elements, the signal cable is redirected upward and extended along the main member to stride over a user's ear and then hang down to connect to a mobile phone or PDA.

Abstract: A headset includes a body and an earphone securely connected to the body. An auxiliary positioning device is provided on the body so that, after the earphone is inserted into an ear channel and the auxiliary positioning device is urged against a concha cartilage, the headset is positioned.

Abstract: A number of improved structures and methods to a condenser microphone device are provided so that the condenser microphone device can be used in a skin-contact manner satisfactorily. According to the proposed methods, the sensitivity of the condenser microphone device is lowered appropriately by reducing the aperture of the through hole on the enclosure of the condenser microphone device's sensing member, or by reducing the amount of electrical charge carried by the thin film inside the sensing member. According to the proposed structures, the sensing member is wrapped inside a plastic jacket or film, covering up the through hole on the sensing member's enclosure, or providing another through hole of very small aperture. The plastic jacket could also form a buffer space between the jacket and the sensing member.

Abstract: A skin-contact microphone device is provided herein, which at least contains a linear body having appropriate plasticity and flexibility, and a voice collection element configured at an end of the linear body. The linear body is structured into a three-dimensional shape which, when viewed from the top, has a curved shape like the letter ‘C’ and, when viewed from a side, has a shape like the symbol ‘<’ as the two ends of the linear body are bended upward and downward for an appropriate angle respectively. With this three-dimensional structure, the microphone device is able to have its voice collection element stably and reliably positioned at its best location, which is close to the jaw around the top of a user's throat by having its the other end supported by the muscle around the user's clavicle.

Abstract: A piezoelectric contact-type microphone structure is provided. With this structure, the piezoelectric element directly touches the speaker's skin without the intervening sponge or spring to fully pick up the skin vibration and to avoid high-frequency attenuation. The structure also provides an ample room for the piezoelectric element to undergo full structural change. The structure avoids the low-frequency distortion resulted from a resonance structure formed by the piezoelectric element, the sponge or spring, and the casing of the microphone. A microphone using this structure has a flat frequency response and a superior performance both for high- and low-frequency voice signals.

Abstract: An adjustable earplug-type headset is provided. The headset mainly contains a body member whose inner side is configured with an earphone and a positioning track. A positioning device is configured on an adjusting member, which in turn is slidably installed inside the positioning track. The positioning device helps to position the headset steadily and reliably on a user's outer ear when it is stuck in an appropriate location within the user's outer ear. The distance between the positioning device and the earphone could be adjusted by each individual user to fit his or her ear's specific characteristic. The adjusting member contains spring elements to lock the adjusting member and the positioning device to the positioning track by configuring corresponding and matching geometrical shapes along the surfaces where the spring elements and positioning track interface with each other.

Abstract: A headset includes a body and an earphone securely connected to the body. An auxiliary positioning device is provided on the body so that, after the earphone is inserted into an ear channel and the auxiliary is urged against a cochlear cartilage, the headset is positioned.