Drawing device and drawing method
A drawing device draws a pattern on a substrate by radiating light from an optical head part on a target object (for example, substrate) which relatively moves with respect to the optical head part. Here, the optical head part has a spatial modulating unit which spatially modulates light from a light source, based on pattern data, and an optical path corrector which shifts the route of light spatially modulated in the spatial modulating unit at precision subdivided more than units of spatial modulation in the spatial modulating unit (more specifically, for example, units of pixels of spatial light modulator).
1. A drawing device including an optical head and a drawing apparatus, which draws a pattern on a target object by repeatedly drawing one stripe on said target object by radiating light from said optical head on said target object while relatively moving said optical head and said target object along a main scan direction and repeatedly relatively moving said optical head and said target object along a sub scan direction orthogonal to said main scan direction, wherein
said optical head comprises:
a spatial light modulating part which spatially modulates light from a light source based on pattern data in which a pattern to be drawn on said target object is described; and
an optical path corrector which corrects a drawing position by shifting a path of light spatially modulated in said spatial light modulating part at a precision subdivided more finely than resolution units of said spatial modulation in said spatial light modulating part, and
said drawing apparatus comprises:
an image capturer which is provided a specified distance toward an upstream Side along said main scan direction from said optical head and which captures said image of drawing scheduled area on said target object; and
a shift amount calculator which detects said position of an existing pattern previously formed on said target object, from captured image data obtained by said image capturer capturing an image of said drawing scheduled area, and calculates an amount of shift for shifting said path of light spatially modulated based on said defected position, wherein
said image capturer captures said image of said drawing scheduled area on an upstream side in said main scan direction, said shift amount calculator calculates said shift amount based on the result of the image capturing, and thereafter, said optical head irradiates light on the said target object in a path of light shifted by the amount of said shift amount in a downstream side of said main scan direction, in each of said operation of performing drawing said one stripe on said target object.
2. The drawing device according to claim 1 , further comprising a data corrector which corrects said pattern data based on a position of an existing pattern previously formed on said target object, wherein said spatial light modulating part spatially modulates light from said light source based on said corrected pattern data.
3. The drawing device according to claim 2 , wherein said data corrector predicts the position of the existing pattern previously formed on said target object based on captured image data obtained by capturing an image of a representative position of said target object, and corrects said pattern data based on said predicted position of said existing pattern previously formed on said target object.
4. The drawing device according to claim 1 , wherein said spatial light modulating part comprises a plurality of light modulators which are aligned in a certain direction, and spatially modulates light from said light source in units of pixels of each of said plurality of light modulators.
5. The drawing device according to claim 4 , wherein said light modulator is a light modulator of a diffraction grating type.
6. The drawing device according to claim 1 , wherein said optical path corrector comprises: an optical system in which two prisms including optical surfaces which are not parallel, are arranged on said path of spatially modulated light; and a prism mover which changes a separated distance between said two prisms to shift said path of spatially modulated light.
7. A drawing method of drawing a pattern on a target object by repeatedly drawing one stripe on said target object by radiating light from an optical head on said target object while relatively moving said optical head and said target object along a main scan direction and repeatedly relatively moving said optical head and the said target object along a sub scan direction orthogonal to said main scan direction, each said drawing said one stripe, comprising the steps of:
a) capturing an image of a drawing scheduled area on said target object at a specified distance toward an upstream side along said main scan direction from said optical head;
b) detecting said position of an existing pattern previously formed on said target object, from captured image data obtained by said image capturer capturing an image of said drawing scheduled area, and calculating an amount of shift for shifting a path of light spatially modulated based on said detected position;
c) spatially modulating light from a light source based on a pattern data in which a pattern to be drawn on said target object is described; and
d) correcting a drawing position by shifting a path of spatially modulated light at a precision subdivided more finely than resolution units of said spatial modulation according to said shift amount; and
e) irradiating light on said target object by said optical head in a path of light shifted by the amount of said shift amount in a downstream side of said main scan direction.