Image drawing apparatus and image drawing method

Details Image drawing apparatus and image drawing method Image drawing apparatus and image drawing method

2007-02-13

2007-02-13

Mathews, Alan (Department: 2851)

Photocopying

Projection printing and copying cameras

Illumination systems or details

C347S233000, C347S241000

Reexamination Certificate

active

11154711

ABSTRACT:
In an image drawing apparatus and an image drawing method for forming a desired two-dimensional pattern on an image drawing surface by using a plurality of image drawing heads, uneven density and resolution caused by errors in relative positions of the heads and installation angles thereof and by an effect of pattern distortion can be reduced. A rectangular two-dimensional pixel array is installed in each of exposure heads in an exposure apparatus (image drawing apparatus) so as to make a predetermined angle with the direction of scanning, facing an exposure surface of a photosensitive material. Combinations of slits and photo detectors detect positions of light spots in the exposure surface comprising inter-head relay areas. Pixels in the pixel arrays are selected so as to realize N-overlay exposure ideally by causing overexposure and underexposure to be minimal in the inter-head relay areas.

REFERENCES:
patent: 6244702 (2001-06-01), Sakino et al.
patent: 9-277571 (1997-10-01), None
patent: 2003-195512 (2003-07-01), None
patent: 2004-9595 (2004-01-01), None

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