Apparatus for and method of drawing

A method of directing light onto a substrate with a photosensitive material formed thereon to draw a pattern on the substrate, the method comprising the steps of:

• a) moving an optical unit relative to the substrate in a first direction while emitting a beam of drawing light of a strip-shaped cross-sectional configuration from the optical unit, the first direction being orthogonal to a second direction which is the direction of the longer dimension of the strip-shaped cross section of the drawing light beam;
• and
• b) adjusting a distribution of the amount of drawing light as seen in the second direction, the step a) including the substeps of
• a1) emitting a beam of light of a strip-shaped cross-sectional configuration from a light source part, and
• a2) causing the light beam emitted from the light source part to enter a plurality of modulation units arranged in a line in such a manner that the longer dimension of the strip-shaped cross section of the light beam is along the arrangement of the modulation units, and causing the modulation units to modulate the incident light beam, thereby forming the drawing light beam,
• the step b) including the substeps of
• b1) accepting a selection manipulation for selecting the type of shape of a light outgoing ratio function from among a plurality of shape type candidates, the light outgoing ratio function being a function defining a relationship between the position of the modulation units as seen in the direction of the arrangement of the modulation units and a light outgoing ratio, the light outgoing ratio being a ratio of the amount of outgoing light to the amount of light incident on the modulation units, and
• b2) adjusting the light outgoing ratio of each of the modulation units in accordance with the shape type accepted in the substep b1);
• wherein
• the plurality of shape type candidates include at least a trapezoidal type;
• and
• the trapezoidal type includes a mid-portion where the light outgoing ratio is constant, and a changed portion where the light outgoing ratio is changed in inclined form, the changed portion being continuous with the mid-portion.