Patent ID: 8354839
Filing Date: 2013-01-15
Classification: G01B,H04M

Abstract:
1. A portable terminal device, comprising: a movable part having a display part; an arm part provided on a base part, the arm part being configured to support the movable part so that the movable part is rotatable without overlapping the base part in a rotation range of at least ±90° with reference to a rotation center position around a rotation center, the arm part being configured to be foldable relative to the base part through a hinge part; and a position detection part configured to detect a rotational position of the movable part relative to the arm part, wherein the position detection part includes a pair of magnets, a pair of one-output magnetic sensors configured to detect magnetic fields of the magnets, and a calculation part configured to determine the rotational position of the movable part based on outputs of the one-output magnetic sensors, the magnets are provided in a first one of the arm part and the movable part so as to be 90° apart from each other around the rotation center, the one-output magnetic sensors are provided in a second one of the arm part and the movable part so as to oppose the corresponding magnets when the movable part is positioned at the rotation center position, and a first one of the magnets and a first one of the one-output magnetic sensors are positioned on a longitudinal center line passing through the rotation center and extending parallel to a long axis of the portable terminal device, and a second one of the magnets and a second one of the one-output magnetic sensors are positioned on a line perpendicular to the longitudinal center line and passing through the rotation center with the movable part being positioned at the rotation center position.