Abstract: To provide a mobile terminal capable of achieving the optimal volume according to a style without causing discomfort to the user. A mobile terminal in accordance with the present invention includes a main body including a microphone 219, a screen display unit including speaker-and-receiver units 226 and 227 at both ends thereof, the screen display unit being disposed in the main body in such a manner that the screen display unit can slide and rotate with respect to the main body, and switches 224 and 225 that select the speaker or the receiver to be used in respective speaker-and-receiver units according to a style formed by the screen display unit and the main body.

Abstract: A multilayer printed circuit board, including: a signal interconnection which transmits and receives an electrical signal between electronic components; a ground interconnection connected to a ground of a circuit; a power interconnection connected to a power layer to supply power to electronic components; at least one ground layer installed in an inner layer; at least one clearance which passes through the ground layer; and a ground via which connects the ground interconnection with the ground layer. The signal interconnection and the ground interconnection or the signal interconnection and the power interconnection are installed in a pair, and a pair of interconnection vias for interlayer connection are inserted through the clearance installed in the ground layer so that one of the pair of interconnection vias is connected to the ground layer by the ground interconnection.

Abstract: To provide a mobile terminal capable of achieving the optimal volume according to a style without causing discomfort to the user. A mobile terminal in accordance with the present invention includes a main body including a microphone 219, a screen display unit including speaker-and-receiver units 226 and 227 at both ends thereof, the screen display unit being disposed in the main body in such a manner that the screen display unit can slide and rotate with respect to the main body, and switches 224 and 225 that select the speaker or the receiver to be used in respective speaker-and-receiver units according to a style formed by the screen display unit and the main body.

Abstract: A multilayer printed circuit board, including: a signal interconnection which transmits and receives an electrical signal between electronic components; a ground interconnection connected to a ground of a circuit; a power interconnection connected to a power layer to supply power to electronic components; at least one ground layer installed in an inner layer; at least one clearance which passes through the ground layer; and a ground via which connects the ground interconnection with the ground layer. The signal interconnection and the ground interconnection or the signal interconnection and the power interconnection are installed in a pair, and a pair of interconnection vias for interlayer connection are inserted through the clearance installed in the ground layer so that one of the pair of interconnection vias is connected to the ground layer by the ground interconnection.

Abstract: There is provided a charge control apparatus and a charge control method for a portable telephone terminal in which an operation to charge a battery is controlled according to a voltage of the battery and a use state of the user to prevent generation of heat in the portable telephone terminal due to the operation with consumption of a large current. The use state judge circuit 111 determines whether a sufficient voltage is being applied from an AC adapter 102 to the battery 109, temporarily stops the battery charge to supply the current only to the load circuit 107 if the consumption current consumed by the load circuit 107 is large and a sufficient current is not supplied to the battery 109, thereby suppressing the heat generated when a sufficient current cannot be supplied to the battery 109. Also, it is possible to prevent the restriction of the use of the load circuit 107 due to the heat generation or the insufficient current.