Patent ID: 8675362

Claim:
An electronic device comprising: a case; a leg that has a hollow stem portion; and a leg fixing part that is formed in one face of the case and that has a hole into which the leg is inserted and that includes a case thread ridge portion formed on an inside face of the hole; wherein the leg has a first screw structure portion and a second screw structure portion formed on a circumferential face of the stem portion thereof, the first screw structure portion being formed of a plurality of turns of continuous thread ridge that can be screwed into the case thread ridge portion, the second screw structure portion being formed of one or more turns of a thread ridge at a same screw pitch as the first screw structure portion and being screwed into the case thread ridge portion before the first screw structure portion is screwed when the leg is inserted into the hole, and wherein the second screw structure portion has: a coupling portion that is arranged so as to couple a start point and an end point of said one or more turns of a thread ridge and that can be displaced toward a central axis of the leg; a guide portion that is formed in the coupling portion and that guides a thread ridge of the case thread ridge portion between the thread ridges of the second screw structure portion in such a way that when the leg is inserted into the hole while it is turned in a direction in which the leg is inserted into the case, the second screw structure portion is screwed into the case thread ridge portion; and an idle turn inducing portion that is formed in the coupling portion and that idly turns the second screw structure portion with respect to the case thread ridge portion in such a way that when the leg is turned in a direction in which the leg is pulled out of the case, the second screw structure portion is not screwed into the case thread ridge portion.