| 摘要 |
PROBLEM TO BE SOLVED: To highly efficiently inhibit the consistency unevenness by the reciprocity failure generated in a multibeam contiguity exposure method taking also the influence of the reciprocity failure of a main scan direction into consideration and to aim at the improvement in the image quality. SOLUTION: In the four multibeam contiguity exposure of LD 0-3, in every scan period of two line shifts, the pixel alternately carrying out the lighting control of the pixels of the even number data and odd number data into a main scan and sub-scanning direction is changed, and one line is written by two scans. According to this lighting control, even in the presence of data in the vicinity pixels which adjoin in the main and sub scanning direction, since these pixels do not light by the same scan, the consistency change does not localize by equally giving the influence of the reciprocity failure into the main and sub scanning direction, and thereby it becomes possible to inhibit the consistency unevenness highly efficiently. In addition, the number of pixels having data in the vicinity for every pixel is investigated, the exposure quantity is compensated according to this result, and thereby the consistency unevenness in the case where the image influenced by the reciprocity failure and the image not influenced are intermingled is reduced further. COPYRIGHT: (C)2007,JPO&INPIT
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