A method of assembling a rotor structure for a spindle motor for use in an information
recording and playback apparatus is provided in which pollution of the recording
medium due to gases emitted from adhesives and the like used in the manufacturing
process can be prevented. To be more specific, in an assembling process of securing
a rotor yoke and a rotating magnet on a disc section, the rotor yoke, the rotating
magnet, and the disc section is disposed one after another at predetermined positions
of a centering jig used for centering the center of rotation of the rotating magnet
and the center of rotation of the disc section. A pressing mechanism is then placed
on the disc section to press the disc section, the rotor yoke, and the rotating
disc so as to integrate them into one piece. At the same time, emitted gases are
exhausted with an exhausting apparatus in a manner such that the direction of flow
of the emitted gases is from the main surface of the disc section toward the rotor
yoke. With this method, gases and particulates emitted from adhesives are prevented
from reaching and adhering on or reacting with the surface of the recording medium,
and malfunctioning such as head crash due to degradation and deterioration caused
by pollution can be suppressed.
