Optical scanner

An optical scanner comprising:

• a light source device for emitting a light beam for performing an optical scanning operation;
• a linear image forming optical system for forming the light beam from the light source device as a linear image extending in a main scan-corresponding direction;
• an optical deflector for reflecting the light beam from this linear image forming optical system on a deflecting reflecting face and deflecting the reflected light beam at an equal angular velocity;
• a light spot image forming optical system for guiding the deflecting light beam onto a scanned face and converging the deflecting light beam as a light spot on the scanned face;
• and
• adjusting means for adjusting said linear image forming optical system in a cross scan-corresponding direction to correct a curvature in a scanning line formed on the scanned face;
• wherein said light spot image forming optical system includes an image forming reflecting mirror for converging the deflecting light beam onto the scanned face by said light spot image forming optical system in at least the main scan-corresponding direction and having a function for performing the optical scanning operation at an equal speed.