Portable data processing device

Claim 1

A portable data processing device comprising: a casing body housing a contact head, data processing means and an electric source therein; a lid hingedly attached to said casing body so as to be angularly movable between an open position and a closed position, said lid being provided, on an inner side thereof, with a pocket for loading an integrated circuit (IC) card of the type having contact points exposed on one side thereof to be flush with the surface, the integrated circuit (IC) card being loaded in said pocket when said lid is moved to the open position, and the loaded (IC) card being electrically connected with the contact head for data processing when the lid is turned to the closed position; a keyboard mounted on the outer surface of the lid; locking means for securing the lid in the closed position, the locking means being manually operated for unlocking; a detector for detecting when the lid is in the closed position to generate a signal to the data processing means; and a solenoid for holding the lid in the closed position when receiving a signal from the data processing means during at least one of a reading and writing operation, the solenoid being deenergized in reply to a signal from the data processing means after the completion of the at least one of a reading and writing operation to allow the lid to be turned to the open position when the locking means is manually operated.