Block-divided driving apparatus of gradation thermal printhead

Details Block-divided driving apparatus of gradation thermal printhead Block-divided driving apparatus of gradation thermal printhead

1990-05-25

1992-02-18

Fuller, Benjamin R.

Recorders

Thermal recording

358298, 400120, G01D 1510, G01D 1516

Patent

active

050898310

ABSTRACT:
A thermal recording apparatus having a thermal head including a plurality of heating element groups each of which consists of a plurality of heating elements driven simultaneously and arranged in a row is so improved that it can record images without forming printing gaps. The apparatus has a driving unit for producing driving signals indicative of tones of the image data of pixels to drive the heating elements. The pixels correspond to the heating elements, respectively. The period of time of driving the heating elements is varied in accordance with the tones. The driving unit comprises a modification circuit for modifying the period of time of driving at least one of the heating elements which is disposed at each of both ends of each of the heating element groups.

REFERENCES:
patent: 4586054 (1986-04-01), Kurita
patent: 4639741 (1987-01-01), Inoue
patent: 4712930 (1987-12-01), Maruno et al.

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