CIRCUIT FOR GENERATING CENTER PULSE-WIDTH MODULATED WAVEFORMS AND NON-IMPACT PRINTER USING SAME

摘要

A circuit for generating a set of center pulse-width modulated waveforms comprises a counter (34, 70) having a time changing count, and comparators (42, 44, 46, 66a, 66b, 66c) which compare the count with respective preset counts. The preset counts to the comparators being set so that the set of waveforms created is center pulse-width modulated. The waveforms are used to control the enablement times of dot printing elements (20, 60a, 60b, 60c), such as light emitting diodes or the like, which form a part of a non-impact print head.