Patent ID: 6995832
Filing Date: 2006-02-07
Classification: G03F

Abstract:
1. 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 beam position detector that measures a position of the beam on a scanning-line; a fine-section scale corrector that changes the scale of a series of fine-sections to a series of corrected fine-sections in accordance with a scale-change rate to change a scale of a pattern, the series of fine sections being defined by dividing a scanning-line at constant-intervals; a pulse data selector that selects a set of pulse data, corresponding to a length of the corrected fine section that the beam passes, from a series of sets of pulse data, the series of sets of pulse data having a different data-array in accordance with the length of the corrected fine section; 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.