| 摘要 |
PROBLEM TO BE SOLVED: To make the sectional shape of a region remaining defined in a projecting form approximate such a shape that a projecting part which is sectionally almost rectangular is formed on the upper part of a base shaped like an almost trapezoid in the section. SOLUTION: A light power of a laser beam LA is stepped down linearly or almost linearly from P1, starting off with a first point Q1 or its nearby spot, all along a segment connecting a first point Q1 in a first depth L1 which is distant by "m" pixels upstream in the scan direction from an upstream side reference position (PA), with a second point Q2 which is distant by "n" pixels downstream in the scan direction from an upstream side reference position on the surface FA of a recording plate F. Then, the light power of the laser beam LA is set below a sculpture threshold value energy in the upstream side reference position or its nearby spot. Next, the light power of the laser beam LB is stepped down linearly or almost linearly from P2, starting off with a third point Q3 or its nearby spot, all along a segment connecting the third point Q3 with the first point Q1 in a second depth L2 which is distant by (2m+n)×(P2/P1) pixels, upstream in the scan direction from the upstream side reference position (PA), to be followed by the procedure to set the light power of the laser beam LB below the sculpture threshold energy at the first point Q1 or its nearby spot. COPYRIGHT: (C)2009,JPO&INPIT
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