Media playback apparatus and shutter mechanism

A media playback apparatus comprising:

• a panel having an insertion slot through which a medium is to be inserted;
• a base fixed to a rear face of the panel and having a pair of base slots, a pivot-axle projection, a guide projection, and a cam projection;
• a shutter comprising a pair of shafts engaging with the pair of base slots, and configured to slide between a closed position and an open position in response to slide of the pair of shafts through the pair of base slots to cause the shutter to cover the insertion slot at the closed position and expose the insertion slot at the open position on a front face of the panel;
• a pair of arms, each arm having one end engaging with one of the pair of shafts and another end engaging with each other so as to be moveable in a transverse direction in which the arms move toward or away from each other;
• and
• a spring attracting the arms toward each other, wherein
• one arm of the pair of arms has a pivot-axle hole rotatably engaging with the pivot-axle projection and is configured to rotate around the pivot-axle projection in response to slide of the shutter, and
• the other arm of the pair of arms has a long engage hole rotatably and slidably engaging with the guide projection of the base and a curving cam slot slidably engaging with the cam projection, and is configured to move in the transverse direction while rotating around the guide projection in response to slide of the shutter to cause the other arm to get close to the one arm when the shutter is in the closed position or the open position and get away from the one arm when the shutter slides between the open position and the closed position by slide of the cam projection in the cam slot in response to slide of the shutter.