Hinge mechanism of foldable device, and foldable device provided with hinge mechanism

A hinge mechanism of a foldable device for foldably connecting one-end parts of a pair of device cases to each other;

• said hinge mechanism of a foldable device characterized in that
• said hinge mechanism comprises:
• a first frame provided with a joining piece composed of a plate-shaped body having a prescribed length that is attached to one of said device cases, and first and second arm pieces that stand in the same direction from both end parts of said joining piece, and in which joining parts are formed at distal end parts of the first and second arm pieces;
• a second frame provided with a joining piece composed of a plate-shaped body having a prescribed length that is attached to another of said device cases, and third and fourth arm pieces that stand in the same direction from both end parts of said joining piece, and in which joining parts are formed at distal end parts of the third and fourth arm pieces;
• and
• a third frame provided with a joining piece composed of a plate-shaped body having a prescribed length, and first and second connecting pieces that stand in the same direction from both end parts of said joining piece, and are branched to the left and right, and that have first through fourth joining parts connected to said first through fourth arm pieces at said branched distal end parts;
• wherein
• the joining parts formed in said first through fourth arm pieces, and said first through fourth joining parts are pivotally connected;
• first through fourth connecting parts are formed, and a drive mechanism for rotating/retaining said first and second frames in a prescribed position is provided to at least one of said first through fourth connecting parts;
• and
• a connection is formed by a linking mechanism between at least one combination of connecting parts of said first or second connecting part and said third or fourth connecting part, and when said first frame is rotated a prescribed angle in one direction in relation to said third frame about said first and second connecting parts as an axis, said linking mechanism links the rotation so that said second frame rotates the same angle as said first frame in the opposite direction with respect to said third frame about said third and fourth connecting parts as an axis.