Image forming apparatus

An image forming apparatus configured to display an image, comprising:

• a scanning section configured to scan light from a light source in a main scanning direction and a sub-scanning direction orthogonal to the main scanning direction as drawing sine waves at predetermined resonance frequencies, respectively;
• a drive control part configured to track a change in the resonance frequencies to perform drive control of the scanning part according to changed resonance frequencies;
• a detecting part configured to detect a change in a position of the scanning part in the main scanning direction and a change in a position of the scanning part in the sub-scanning direction;
• a phase difference comparator configured to detect a phase difference and a frequency ratio between the main scanning direction and the sub-scanning direction, based on the change in the position of the main scanning direction and the change in the position of the sub-scanning direction, which are detected by the detecting part;
• and
• an image data generation part configured to estimate a scanning trajectory of the scanning part based on the phase difference and the frequency ratio detected by the phase comparator, and generate pixel data corresponding to the scanning trajectory,
• wherein the scanning part scans one frame within a period of time for which scanning in the sub-scanning direction is performed in one direction.