SHAFT PROCESSING METHOD FOR FLUID DYNAMIC PRESSURE BEARING, AND FLUID DYNAMIC PRESSURE BEARING DEVICE AND ROTARY POLYHEDRAL MIRROR DRIVING DEVICE USING THE SHAFT PROCESSING METHOD

摘要

PROBLEM TO BE SOLVED: To attain a longer life of a dynamic pressure bearing in an oil dynamic pressure bearing of a brushless motor used for a polygon motor by reducing sliding of a rotating shaft with a sleeve by run-out of the rotating shaft at the time of starting and stopping it.;SOLUTION: In the fluid dynamic pressure bearing device including a rotating shaft having a tip part worked into a spherical protruding part, the tip of the rotating shaft is worked using a processing method for performing removing work to the tip by use of a tool so that slippage between the centerline of the rotating shaft and a maximum protruding position of the spherical protruding part is smaller than a minimum value of radial difference between the shaft and the sleeve.;COPYRIGHT: (C)2008,JPO&INPIT