DYNAMIC PRESSURE BEARING STRUCTURE, ROTARY DEVICE, DYNAMIC PRESSURE BEARING DEVICE AND MANUFACTURE THEREOF, AND DEFLECTION SCANNING DEVICE AND IMAGE FORMING DEVICE

摘要

PROBLEM TO BE SOLVED: To prevent the abrasion at the time of low-speed rotation. SOLUTION: A shaft 3 integrated with a rotary polygon mirror 1 is fitted in a sleeve 2 having a dynamic pressure generating groove 2a so as to form a dynamic pressure bearing. An electrodeposition film 22 obtained by dispersing the lubricating filler such as silicon group resin and inorganic particulate is formed on a bearing surface 2b of the sleeve 2 after conducting processing with a chemical conversion coating 21. The bearing surface 2b is formed by electrodeposition easier than the plating, and abrasion resistance and lubricating performance of the bearing surface 2b can be remarkably improved.