| 摘要 |
<p>A hinge mechanism includes a fixed cam with first and second sector shaped protruding portions at a fixed cam surface and a rotating cam with first and second sector shaped concave portions at a rotating cam surface, wherein the first and second sector shaped protruding portions engage the first and second sector shaped concave portions and inner and outer periphery protruding portions at the first and second sector shaped protruding portions of the fixed cam surface engage inner and outer periphery concave portions at the first and second sector shaped concave portions of the rotating cam surface at an engaging position. Further, rotation side protruding portions formed at positions other than the concave portions of the rotating cam surface engages at least two positions of the protruding portions formed at the fixed cam surface, respectively, at a position other than the engaging position.</p> |
