Patent ID: 7659888

Claim:
An electronic apparatus comprising: a first unit; and a second unit coupled to the first unit through a coupling section which allows the second unit to be opened and closed relative to the first unit, the second unit having a display screen with a pen input function for detecting the contact of a pen or the close position of a pen, wherein: the first unit includes a circuit substrate on which is disposed a voltage converter circuit provided with one or more components that generate power for operating the electronic apparatus, and the circuit substrate has a first surface facing the second unit and a second surface on the reverse; at least one of the components of the voltage converter circuit is disposed on the second surface of the circuit substrate; and the second unit to detect the contact of the pen or the close position of the pen by using a predetermined frequency, and the component disposed on the second surface is used for voltage conversion which causes interference with the predetermined frequency and is carried out by the voltage converter circuit.