Pen qualification and verification in a graphics plotter

Details Pen qualification and verification in a graphics plotter Pen qualification and verification in a graphics plotter

1991-09-20

1993-11-09

Evans, Arthur G.

395109, G06K 1500

Patent

active

052610381

ABSTRACT:
A method of comparing a test line of a plotter pen with a subsequent plot line in order to compare selected points on the plot line with a benchmark for that particular pen. Each pen in a plotter carousel is qualified by monitoring the print contrast ratio of multiple points taken from vertical and horizontal portions of a sample line drawn by the pen. A record is maintained to indicate the good or bad qualification status of each pen in the carousel, and the appropriate benchmark for each pen is stored for future reference. By comparing the print contrast ratio of a selected sequence of points on an actual plot line with the benchmark for the pen making the plot, the satisfactory function of the pen can be periodically verified.

REFERENCES:
patent: 4335398 (1982-06-01), Yamada
patent: 4789872 (1988-12-01), Hosoi

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