Patent ID: 7468737

Claim:
A method for controlling a light source to generate a light beam on a photosensitive surface, the method comprising: oscillating a mirror; reflecting a light beam with the mirror so that the reflected light beam travels across a photosensitive surface; detecting a first reflected beam at a first moment; detecting a second reflected beam at a second moment, at least one of the first reflected beam or the second reflected beam is detected by a beam detector outside of the photosensitive surface; determining a maximum mechanical deflection angle for the mirror based on the detected first reflected beam and the detected second reflected beam; determining a frequency of the mirror based on the detected first reflected beam and the detected second reflected beam; and controlling the light source, responsive to both the determined maximum mechanical deflection angle and the determined frequency, in order to adjust intensity of the light beam on the photosensitive surface so that the light source is controlled when the mirror is being operated at any one of a plurality of frequencies.