Patent ID: 6999158

Claim:
An apparatus for forming a pattern comprising: a light source that emits a beam; a scanning unit that scans the beam on a photosensitive material; a time-interval detector that successively detects a time-interval that is a pass-time of the beam in each section of a series of fine sections, said series of fine sections being defined by dividing a scanning-line at constant-intervals larger than a dot-pitch; a memory that is capable of storing a series of sets of pulse data that have a different data-array in accordance with the time-interval; a pulse data selector that selects a set of pulse data, corresponding to the detected time-interval, from the series of sets of pulse data; a control pulse signal generator that successively generates a sequence of control pulse signals in accordance with the selected set of pulse data; a writing pulse signal generator that successively generates a sequence of writing pulse signals in accordance with the sequence of control pulse signals, the sequence of control pulse signals controlling the output-timing of the sequence of writing pulse signals; and an optical modulator that modulates the beam in accordance with the sequence of writing pulse signals.