| 摘要 |
The object of the present invention is to reduce the angle of automatic opening of a liquid crystal portion to a value less than a central angle of 70° to 90° of conventional portable phones, etc. This object can be achieved by a single-shaft semi-automatic hinge, wherein a first cam and a second cam fitted on the single shaft of the hinge passing therethrough are abutted on each other with pressure application by an elastic member, thereby generating a rotational friction torque; a region of the first cam and the second cam in which the liquid crystal portion can rotate from a state in which the main body portion and the liquid crystal portion are folded to a fully open state is set narrower than-a region in which the hinge can rotate; a protruding body is formed on an abutment surface of the first cam; in a central angle range of 0° to 180° of an abutment surface of the second cam, a notched portion is formed at 0° and then a convex top portion, a slanted descending surface, and a deep valley portion are formed successively in the rotation direction in the order of description from the rotation start site and the convex top portion is provided at a central angle of less than 50°; and a rotational angle restricting function, which prevents the protruding body of the first cam from sliding down into the notched portion of the second cam when the main body portion and the liquid crystal portion are folded, is formed between a central angle of 0° and the convex top portion. |
