Hinge structure and electronic apparatus including same

An electronic device comprising:

• a first housing;
• a second housing;
• and
• a hinge structure connected to the first housing and the second housing such that the first housing rotates about a first rotational axis parallel to an axial direction and the second housing rotates about a second rotational axis parallel to the axial direction,
• wherein the hinge structure comprises:
• a first arm shaft configured to operate with a rotation of the first housing, the first arm shaft being parallel to the axial direction;
• a second arm shaft configured to operate with a rotation of the second housing, the second arm shaft being parallel to the axial direction;
• a first arm cam and a second arm cam, both configured to rotate together with the first arm shaft;
• a third arm cam and a fourth arm cam, both configured to rotate together with the second arm shaft;
• a first cam member comprising a first moving cam and a second moving cam, the first moving cam being engaged with the first arm cam and the second moving cam being engaged with the third arm cam, and the first cam member being configured to move in the axial direction along the first arm shaft and the second arm shaft;
• a second cam member comprising a third moving cam and a fourth moving cam, the third moving cam being engaged with the second arm cam and the fourth moving cam being engaged with the fourth arm cam, and the second cam member being configured to move in the axial direction along the first arm shaft and the second arm shaft;
• a first elastic member coupled to the first arm shaft and disposed between the first cam member and the second cam member;
• and
• a second elastic member coupled to the second arm shaft and disposed between the first cam member and the second cam member,
• wherein the electronic device is operable to be in a free-stop section between a fully folded state and a flat state, a first state between the free-stop section and the fully folded state, and a second state in which the electronic device is further unfolded than in the first state, the second state being between the free-stop section and the fully folded state, and
• wherein the hinge structure is configured such that when the electronic device changes from the fully folded state to the second state, the first cam member is fixed in a specified position in the axial direction and the second cam member moves in the axial direction.