Patent ID: 7117564

Claim:
A hinge device for a mobile phone having a rotation type display including a body housing, a folder having a display unit, and a connection member for rotatably connecting the folder to the body housing such that the folder is movable into an open position and a closed position with respect to the body housing, the hinge device comprising: a hinge module having a plate shape, the hinge module being accommodated in the folder and rotatably coupled to the connection member while facing the connection member so as to rotate the folder relative to the connection member about a hinge axis thereof, the hinge module including a first hinge plate screw-coupled to the connection member; a second hinge plate accommodated in the folder and coupled to the first hinge plate allowing rotation of the folder about the hinge axis; a rotary washer aligned between the first and second hinge plates while facing the first hinge plate allowing rotation of the second hinge, said rotary washer including at least one washer protrusion formed along an outer circumferential portion of the rotary washer with a uniform interval in such a manner that the washer protrusion is inserted into a washer groove of the first hinge plate and a pair of fixing protrusions formed at an inner portion of the rotary washer and fixedly inserted into fixing slots of a hinge housing of the second hinge plate; a wave washer provided between the second hinge plate and the rotary washer applying a biasing force to the folder in order to rotate the folder; and a snap ring coupled to the second hinge plate.