Patent ID: 7880760

Claim:
An optical writing device including at least two optical elements for scanning at least two scan objectives, said optical writing device comprising: at least two light sources each configured to emit a light beam having a different wavelength from the other; a light deflection device configured to deflect the light beams from the at least two light sources after being combined on the same axis in a sub scanning direction; a first beam separation device arranged to receive the light beams and configured either to allow the light beams to enter and pass or to reflect the light beams in accordance with a direction of entrance of the light beams; a second beam separation device configured either to allow or to reflect the light beams having passed through the first beam separation device in accordance a wavelength thereof, said light beam passing through the second beam separation device scanning one of the at least two scan objectives, said light beam reflected by the second beam separation device being reflected by the first beam separation device and then scanning the other one of the at least two scan objectives; and a first imaging device configured to correct a f-theta (fθ) performance and a curvature of an imaging plane to enable the light beams to scan the at least two scan objectives at a constant speed, said first imaging device being integral with the first beam separation device.