Dynamic-pressure gas bearing structure and optical deflection scanning apparatus

摘要

A dynamic-pressure gas bearing structure includes a sleeve (3), a column-like shaft (2) fitted to the sleeve (3), and a plurality of shallow grooves (21) formed on the outer peripheral surface of the shaft (2) and extending in the axial direction of the shaft (2). The shallow grooves (21) are formed by grinding in which grains are aligned to the aforementioned axial direction. An optical deflection scanning apparatus is provided with such dynamic-pressure gas bearing structure.