Circuit for controlling thermal heads of printing apparatus

Details Circuit for controlling thermal heads of printing apparatus Circuit for controlling thermal heads of printing apparatus

B - Operations, Transporting

41

J

314/41

B41J 2/35 (2006.01) G06K 3/00 (2006.01) G06K 15/10 (2006.01) H04N 1/405 (2006.01)

Patent

CA 1281765

ABSTRACT OF THE DISCLOSURE A PWM (Pulse Width Modulation) control circuit for printing apparatus comprises a memory for storing digitalized image data, a main converter connected to the memory for converting upper bits of the digitalized image data onto a main pulse-width modulated signal based on a first unit time duration, a sub-converter connected to the memory for converting the rest of the bits of the digitalized image information into a sub pulse-width modulated signal based on a second unit time duration, and a drive circuit connected to the main converter and sub-converter for generating the driving signal in accordance with the main pulse-width modulated signal and sub pulse-width modulated signal. The amount of transferred digital tone data per horizontal line of a whole printing screen becomes reduced and the color concentration characteristics of the thermal head are appropriately maintained within an acceptable range.

546899

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