Thermal print head driving system

Details Thermal print head driving system Thermal print head driving system

1985-05-08

1987-08-18

Evans, Arthur G.

Recorders

Thermal recording

364519, G01D 1510

Patent

active

046880518

ABSTRACT:
A thermal print head driving system supplies a predetermined number of driving pulses to each of a plurality of heat-producing elements arranged in a line to record a single dot of desired tone. The pulse width of driving pulse is controlled in accordance with the temperature at or in the vicinity of the heat-producing elements thereby allowing to maintain the density level of desired tone at constant. In another aspect of the present invention, it is so structured that driving pulses may be applied to the heat-producing elements in a continuous manner without producing a cooling period during switching between tone levels. In a further aspect of the present invention, it is so structured that a predetermined number of driving pulses for each of predetermined number of tone levels is altered in consideration of the data in at least one of preceding recording lines, thereby allowing to carry out a high speed recording operation without causing fluctuations in predetermined tone density level.

REFERENCES:
patent: 4071849 (1978-01-01), Koyano et al.
patent: 4443121 (1984-04-01), Akai
patent: 4464669 (1984-08-01), Sekiya et al.

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