To provide an optical scanning apparatus that highly accurately positions and holds an optical element on a holder, and that suppresses deterioration in optical characteristics as much as possible in the time of thermal deformation.
This is an optical scanning apparatus that deflects and scans light radiated from a light source in a main scanning direction Y by a scanning lens 13 or the like. The scanning lens 13 is elongated in the main scanning direction Y and has a flat mounting reference face 13a on one side. A lens holder 30 has: a positioning bearing surface 33 that supports the mounting reference face 13a of the scanning lens 13 at least at three points on the X-Y plane and an adhesive bearing surface 36 that is for forming a filling space 40 between it and the mounting reference face 13a for the purpose of filling an adhesive 50. The scanning lens 13 is positioned and adjusted on the positioning bearing surface 33 in accordance with advance or retreat of a screw member 45, in the state where the mounting reference face 13a is elastically held with pressure on the positioning bearing surface 33 with a leaf spring 43. After this positional adjustment, the adhesive 50 is charged in the filling space 40 and hardened.
NAGASAKA YASUSHI
KUSANO HIDEAKI
MATSUO TAKAHIRO
Tani Kazuhiro