Optical scanning device and image forming apparatus including the same

An optical scanning device comprising:

• a casing;
• a light source;
• a deflector provided in the casing to deflect light beams emitted from the light source;
• a synchronization detection mirror that reflects the light beams reflected from the deflector;
• a synchronization detection sensor that outputs a synchronization signal when the light beams reflected by the synchronization detection mirror are incident;
• a writing control unit that starts writing of image data by the light source when a predetermined time passes after the signal from the synchronization detection sensor is received;
• and
• a correction mechanism that rotates the synchronization detection mirror by a predetermined angle around a sub-scanning axis in accordance with a change in temperature inside the casing, thereby correcting position shift of a written image,
• wherein the correction mechanism comprises:
• a fixing support part provided to the casing and fixing the synchronization detection mirror thereto;
• and
• a first adhesive part and a second adhesive part respectively provided at one end side and the other end side of the synchronization detection mirror in a width direction perpendicular to a sub-scanning direction and serving as adhesives for allowing the synchronization detection mirror to adhere to the fixing support part,
• wherein the correction mechanism is configured to rotate the synchronization detection mirror around the sub-scanning axis due to a difference between of thermal deformation amounts of the first adhesive part and the second adhesive part in a thickness direction when the temperature inside the casing has changed.