| 摘要 |
PROBLEM TO BE SOLVED: To prevent a bearing part from being damaged by force applied from the upper side of a motor at the time of assembling a polygon mirror in a deflection scanner using a fluid dynamic pressure bearing. SOLUTION: The fluid dynamic pressure bearing in which a hole or a notch to guide a supporting member supporting a rotary driving part from the lower side of a circuit board at the time of assembling a polygon mirror into the rotary driving part is provided at the circuit board is used in this deflection scanner. |
