Patent ID: 6100915
Filing Date: 2000-08-08
Classification: H04N,H05K

Abstract:
A laser drawing apparatus for drawing a pattern on a workpiece by scanning the workpiece with at least one laser beam and by modulating the laser beam on the basis of raster-graphic data, in accordance with a series of clock pulses, said apparatus comprising:a calculator for calculating respective clock-pulse-phase-shift location data, to which a phase of said clock pulses should be shifted, with a unit of less than 2.pi., on the basis of pixel-dot-pitch discrepancy data previously measured along equally-divided sections of a scanning line defined by the scanning laser beam; anda clock-pulse-outputting controller for controlling outputting of said clock pulses so that the phase of said clock pulses is shifted, with the unit of less than 2.pi., whenever said laser beam reaches each clock-pulse-phase-shift location, represented by said clock-pulse-phase-shift location data, during the scanning of said workpiece with said laser beam, whereby a pixel-dot-pitch discrepancy in each of said equally-divided sections of said scanning line can be corrected with a unit of less than a one-pixel-dot size.