Laser scanning unit and image forming apparatus including the same

A laser scanning unit comprising:

• a light source configured to emit a light beam;
• a deflection member configured to deflect the light beam emitted from the light source, and cause the light beam to scan a surface-to-be-scanned in a main scanning direction;
• a scanning lens configured to cause the deflected light beam to form an image on the surface-to-be-scanned;
• a control portion configured to control a light amount of the light beam emitted from the light source;
• and
• a storage portion configured to store therein aberration characteristics representing a relationship between image heights of the scanning lens and a wavefront aberration amount thereof, which have been obtained in advance, wherein
• the control portion, when the scanning is performed, controls the light amount of the light beam in accordance with the aberration characteristics, and the control portion performs the control such that the light amount is set to a predetermined first light amount, at a point of a first image height where the wavefront aberration amount has a first value, and the light amount is set to a second light amount larger than the first light amount, at a point of a second image height where the wavefront aberration amount has a second value larger than the first value.