Patent ID: 7356880

Claim:
A hinge structure, comprising: a rotatable plate member; a frame member; a spring member that connects the rotatable plate member with the frame member at each of two opposite positions along a rotation axis so that the rotatable plate member rotates about the rotation axis with respect to the frame member, wherein the spring member includes: a first axial section; a second axial section, an end of the first axial section being connected to the frame member, an end of the second axial section being connected to the rotatable plate member, a predetermined gap being formed between another end of the first axial section and another end of the second axial section; a first zigzag section and a second zigzag section formed on opposite sides with respect to the rotation axis, each of the first and second zigzag sections including parallel portions which are parallel with each other and with the rotation axis and bent portions each connecting adjacent parallel portions, the bent portions being arranged in a direction perpendicular to the rotation axis, an end of the first zigzag section being connected to the other end of the first axial section, an end of the second zigzag section being connected to the other end of the second axial section, and the other end of the first zigzag section being connected to the other end of the second zigzag section.