Method of and device for driving thermal head in printer

Details Method of and device for driving thermal head in printer Method of and device for driving thermal head in printer

1990-08-30

1992-11-10

Fuller, Benjamin R.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346 76PH, B41J 232

Patent

active

051628139

ABSTRACT:
A thermal head in a printer, which has an array of heating elements along a main scanning direction, the heating elements being drivable by a pulse signal is driven for two-dimensionally scanning a heat-sensitive medium which is moved in an auxiliary scanning direction normal to the main scanning direction, thereby recording image information on the heat-sensitive medium. The temperature of the thermal head is detected, and a change in the detected temperature is calculated per predetermined time. Thereafter, the pulse duration of a pulse supplied to the heating elements is gradually increased or reduced. Depending on the calculated change in the temperature, per each of main scanning lines within a predetermined length in the auxiliary scanning direction.

REFERENCES:
patent: 4710783 (1987-12-01), Caine et al.

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