Driving apparatus for thermal head

Details Driving apparatus for thermal head Driving apparatus for thermal head

1989-06-16

1991-08-06

Fuller, Benjamin R.

Recorders

Thermal recording

G01D 1510

Patent

active

050381547

ABSTRACT:
An apparatus for driving a thermal recording head having a plurality of heat-generating elements in alignment wherein energy applied to any one heat-generating element is determined on the basis of a recording energy E.sub.p determined on an assumption that both the heat-generating element and adjacent heat-generating elements are energized and also in accordance with a compensation energy E.sub.r for compensating for an energy shortage at the time of non-energization of adjacent elements in actual recording. The recording energy E.sub.p is determined from a target energy EO required for forming a recording dot, heat storage energy E.sub.s already possessed by the element before a current energization thereof and a correction quantity given by a function of the heat substrate temperature T.sub.h, and E.sub.s is stored and updated for each line recording operation in accordance with a function of E.sub.p. The compensation energy E.sub.r is given by a function of the value T.sub.h selected in accordance with the energization
on-energization of the current element and adjacent elements. The amount of energy applied to each heat-generating element is finely and precisely controlled by energization pattern data D1 to D8 of n (e.g., 8) bits for selecting different combinations of durations and positions of energization pulses. There are 4096 heat-generating elements are divided into 16 blocks, and such an energization pattern data serially transferred is rearranged and transferred in parallel to the blocks.

REFERENCES:
patent: 4563691 (1986-01-01), Noguchi et al.
patent: 4590487 (1986-05-01), Noguchi et al.

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