Production method of rotating device having thrust dynamic pressure generating site on which a thrust pressure pattern is formed and rotating device produced by said production method

A production method of a rotating device having:

• a fixed body;
• a rotating body supported rotatably around a rotating axis;
• a fixed member fixed to the fixed body;
• a rotating member fixed to the rotating body so as to surround the rotating axis, facing the fixed member in the axial direction;
• and
• a thrust dynamic pressure generating site provided with a thrust dynamic pressure pattern formed on at least either a part of the end surface of the rotating member or a part of the end surface of the fixed member, which face the axial direction, wherein the production method comprises:
• setting either the rotating member or the fixed member in the manufacturing apparatus as a member to be marked by using a manufacturing apparatus provided with,
• a rest table,
• a movable table supported such that the movable table can move up and down relative to the rest table,
• a driving device arranged on the rest table side of the movable table and configured to generate a pressing force,
• a drive circuit configured to output a output signal to the driving device,
• a supplemental-force providing means arranged on the side opposite from the rest table side of the movable table and configured to provide a supplemental force, separate from the pressing force, to the movable table, and
• a first die arranged in between the driving device and the rest table;
• bringing the member to be marked and the first die into contact with each other;
• forming the thrust dynamic pressure pattern gradually by consecutively repeating a cycle for a plurality of times, which includes a pressuring operation of marking a step portion on the member to be marked by applying the pressing force on the member to be marked through the first die and a releasing operation of releasing the pressing force thereafter;
• and
• incorporating the member to be marked in the rotating device, wherein
• the thrust dynamic pressure pattern is formed while applying the supplemental force, separate from the pressing force, which is small enough to prevent the shape of the member to be marked from being changed but large enough to maintain the state of contact of the first die with the member to be marked.