Patent ID: 6707575
Filing Date: 2004-03-16
Classification: G06K

Abstract:
A resolution heightening circuit connected between a printing unit, which has a first resolution, and a host printer control circuit, which produces printing data for a second resolution greater than the first resolution, for producing modulated driving pulses on the basis of the printing data and for supplying the modulated driving pulses on the basis of the printing data and for supplying the modulated driving pulses to said printing unit to apparently heighten the resolution of said printing unit, said resolution heightening circuit comprising:a modulation information generating circuit connected to said host printer control circuit for generating a pulse width modulation information signal on the basis of the printing data to increase the number of dots for a line at the printing unit, wherein said modulation information generating circuit uses a template pattern of four lines by three dots; and a modulation circuit connected to said modulation information generating circuit and said printing unit for producing the modulated driving pulses in response to the pulse width modulation information signal to supply the modulated driving pulses to the printing unit.