Patent ID: 8369909

Claim:
A portable terminal having a sliding opening and closing device, comprising: a main body; a main plate which is coupled to said main body; a slide plate which is coupled to be slidable to said main plate; a rotating plate which is coupled to be rotatable to said slide plate; a sub body which is fixed to said slide plate; and a display device which is fixed to said rotating plate and rotatable relative to said sub body, wherein one of the slide plate and the rotating plate defines a trajectory groove; and wherein the other of the slide plate and the rotating plate includes a rotation limiting boss for engaging the trajectory groove to limit rotation of the slide plate relative to the rotating plate; at least one elastic part having one end supported by the main plate and another end supported by the rotating plate, so that the at least one elastic part can supply an elasticity power to said rotating plate to maintain the initial condition when said rotating plate is not rotating, while the at least one elastic part can supply an elasticity power to said rotating plate to continue to rotate when said rotating plate is rotating; wherein the point of inflection of the at least one elastic part in a direction of the elasticity power is positioned within ½ of the total movement distance of the main plate from the closed spot thereof, whereby the shorter distance from the open position of the sub body to the inflection point allows the sub body to be rapidly opened.