Electronic apparatus including immobilizing mechanism for swivel mechanism

An immobilizing mechanism for an electronic apparatus, said electronic apparatus including a first enclosure and a second enclosure designed to take first and second attitudes based on rotation around a first rotation axis, said second enclosure of the first attitude opposing its front surface to a front surface of the first enclosure, said second enclosure of the second attitude opposing its back surface to the front surface of the first enclosure, said second enclosure designed to rotate relative to the first enclosure around a second rotation axis defined within a plane perpendicular to the first rotation axis, said immobilizing mechanism comprising:

• a protrusion member guided on the second enclosure along a straight line, said protrusion member designed to move between firs and second positions, said protrusion member allowing one end to protrude out of the front surface of the second enclosure, said protrusion member allowing other end to protrude out of the back surface of the second enclosure;
• and
• a receiving hole defined on the front surface of the first enclosure, said receiving hole designed to receive insertion of the one end of the protrusion member when the second enclosure of the first attitude is positioned at a predetermined position based on rotation around the second rotation axis.