Line head driving apparatus

Details Line head driving apparatus Line head driving apparatus

1990-07-05

1992-02-04

Fuller, Benjamin R.

Recorders

Thermal recording

400120, 358298, G01D 1510, B41J 236

Patent

active

050863061

ABSTRACT:
A line head driving apparatus includes a correcting circuit which sets an electrical energy level to be applied to thermal elements to be greater than that indicated by multilevel image data supplied from a preprocessing circuit when a series of multilevel image data indicates an increase in an image density in a sub scan direction perpendicular to the main scan direction. On the other hand, the correcting circuit sets the electrical energy level to be applied to the thermal elements to be less than that indicated by the image data supplied from the preprocessing circuit when the series of multilevel image data indicates a decrease in the image density in the sub scan direction. The line head driving apparatus also includes a head driving circuit which drives the thermal elements in accordance with the electrical energy level set by the correcting circuit.

REFERENCES:
patent: 4679055 (1987-07-01), Inui et al.
patent: 4688051 (1987-08-01), Kawakami et al.
patent: 5006866 (1991-04-01), Someya

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