System for driving a thermal print head for constant dot density

Details System for driving a thermal print head for constant dot density System for driving a thermal print head for constant dot density

1987-10-13

1989-07-04

Hartary, Joseph W.

Recorders

Thermal recording

346110R, 340728, 340722, G01D 1510

Patent

active

048455202

ABSTRACT:
A system for driving a thermal print head including a plurality of heat-producing elements which are activated selectively in accordance with digital image data obtained from an analog image signal is provided. In one aspect, the driving system is so structured to insert additional data between any two adjacent image data whenever the space between the two exceeds a predetermined level thereby allowing to maintain the dot density at constant when printed. In another aspect, the driving system controls the time period of activation of each of the heat-producing elements in accordance with preheat control data obtained by carrying out AND processing between each of the digital image data of one print line and the corresponding each of the digital image data of the next following print line. In a further aspect, the present driving system has a structure such that a reference point in a print line may be set at a desired location along the print line.

REFERENCES:
patent: 4038668 (1977-07-01), Quarton
patent: 4263593 (1981-04-01), Dagostino et al.

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