Laser drawing apparatus

Details Laser drawing apparatus Laser drawing apparatus

1997-08-27

2000-08-08

Le, N.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347235, 347250, 347252, H04N 1047

Patent

active

061009156

ABSTRACT:
In a laser drawing apparatus, a pattern is drawn on a workpiece by scanning the workpiece with at least one laser beam. The laser beam is modulated on the basis of raster-graphic data, in accordance with a series of clock pulses. A calculator calulates clock-pulse-phase-shift location data, indicative of where a phase of the clock pulses should be shifted, with a unit of less than 2.PI.. The calculation is made on the basis of pixel-dot-pitch discrepancy data measured along a scanning line defined by the scanning laser beam. A clock-pulse-outputting controller controls outputting the clock pulses so that the phase of the clock pulses is shifted, with the unit of less than 2.PI.. The shift occurs whenever the laser beam reaches each of the clock-pulse-phase-shift locations, represented by the clock-pulse-phase shift location data, during scanning of the workpiece with the laser beam. Consequently, a pixel-dot-pitch discrepance in the scanning line can be corrected with a unit of less than a one-pixel-dot size.

REFERENCES:
patent: 4920430 (1990-04-01), Isono et al.
patent: 5046796 (1991-09-01), Andoh et al.
patent: 5117106 (1992-05-01), Andon et al.
patent: 5664251 (1997-09-01), Tachihara et al.

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