Abstract: A headset of the invention can achieve high-quality sound reproduction over a wide band while allowing sound from the outside to be sufficiently heard. The headset includes at least one vibrator configured to vibrate in accordance with an electric signal. The headset also includes at least one diaphragm each being associated with the respective vibrator. The headset also includes a holding unit that, when worn on a head of a user, holds the diaphragm such that at least part of the diaphragm is spaced from a side surface of the head by a predetermined distance. When the headset has two diaphragms, the holding unit may also function as a linking member that links the two diaphragms.

Abstract: A communication system including a first transceiver adapted to communicate with a first network; a second transceiver adapted to communicate with a second network; and an interface to a third network a switching network is included for routing signals between the first transceiver and the interface in a first mode of operation and for routing signals between the first transceiver and the second transceiver in a second mode of operation. A central processing unit is included for switching the controller between the first mode and the second mode in response to an input signal. In the illustrative embodiment, the first network is a cordless telephone network, the second network is a wireless cellular network and the third network is a public switched telephone network.

Abstract: Capacitors are connected in parallel to a primary side induction coil in a charger 1 and a secondary side induction coil in a cordless equipment (handset unit) respectively, and LC parallel resonance circuits are formed in the charger and the cordless equipment respectively with this parallel connection. Each of the primary side induction coil and secondary side induction coil is formed with a sheet coil, and the sheet coils are arranged and fixed in the charger and the cordless equipment respectively so that the sheet coils face to each other with a prespecified gap in the charging state where the cordless equipment has been set in the charger.

Abstract: When a reference potential is loaded to a pair of lead wires connected via a resistor having a resistance value corresponding to a specified battery capacity, a partial potential is obtained through a serial circuit comprising the resistor above, a diode, and another resistor, and a collector current for transistors is adjusted according to a relation between the partial potential and the resistor. As a result, a current value of the charging current supplied from a charger to a battery pack is controlled, and a charging operation for a charging time allocated by a microcomputer to standard charging or fast charging is insured.