Opening/closing apparatus and hinge device thereof

An opening/closing apparatus, comprising:

• a first component;
• a second component;
• and
• at least one hinge device, wherein the first component is connected with the second component by the at least one hinge device, the hinge device comprising:
• a first main body, including a first shaft hole and a first surface, the first surface surrounding the first shaft hole to form a first inner ring and a first outer ring, and the first surface including a raised structure, wherein the raised structure includes a first raised portion on the first outer ring and a second raised portion on the first inner ring, and the second raised portion is disposed relative to the first raised portion;
• and
• a second main body, including a second shaft hole and a second surface, the second surface surrounding the second shaft hole to form a second inner ring and a second outer ring;
• the second surface including a first position structure, a first torsion control structure, a second position structure, and a second torsion control structure;
• wherein the first torsion control structure is adjacent to the first position structure and the second position structure, the second torsion control structure is disposed relative to the first torsion control structure based on the second shaft hole, and the second torsion control structure is adjacent to the first position structure and the second position structure, wherein the first position structure and the second position structure correspond to the raised structure respectively;
• the first torsion control structure including a first outer control portion on the second outer ring and a first inner control portion on the second inner ring, the second torsion control structure includes a second outer control portion on the second outer ring and a second inner control portion on the second inner ring, wherein a height of the first inner control portion is different from a height of the second inner control portion, and a height of the first outer control portion is different from a height of the second outer control portion.