Patent ID: 6915557

Claim:
A method of assembling a rotor structure for use in an information and playback apparatus comprising a disc section having an information recording layer on a main surface and a cylindrical projecting member, said method comprising the steps of: a) placing said projecting member and said disc section at predetermined positions on a centering jig; b) integrating said disc section and said projecting member into one piece by pressing said disc section and said projecting member; and c) exhausting gases emitted during step b) wherein the direction of flow of the exhausted gases is from the main surface of said disc section toward said projecting member; wherein the assembling/centering jig or the centering jig has an exhaust inlet provided on a surface opposite to a bottom surface of the disc section, an exhaust outlet provided on a surface not provided with said exhaust inlet, and a communicating hole bored between said exhaust inlet and said exhaust outlet thus enabling exhaustion of emitted gases by connecting an exhausting apparatus to said exhaust outlet via an exhaust pipe.