Portable electronic device

A portable electronic device, comprising a first machine body, having a first upper surface and a first lower surface opposite to each other;

• a second machine body, having a second upper surface and a second lower surface opposite to each other;
• and a hinge structure, comprising a passive module, the passive module having a lens, the first machine body and the second machine body is pivoted to each other through the hinge structure, wherein the first upper surface and the second upper surface are opposite to each other in a first state, and the lens is in the first state and exposed on the first upper surface and the second upper surface when an angle included between the first upper surface and the second upper surface falls between 90 degrees and 150 degrees, wherein the first lower surface and the second lower surface are opposite to each other in a second state, and the lens is in the second state and exposed on the first lower surface and the second lower surface when an angle included between the first lower surface and the second lower surface falls between 50 degrees and 90 degrees;
• wherein when a user rotates the first machine body or the second machine body from the first state to the second state, the rotation cause the passive module to rotate inside the hinge structure and turn the lens from the first state to the second state.