Circuit for controlling energization of thermal print head

Details Circuit for controlling energization of thermal print head Circuit for controlling energization of thermal print head

1985-05-28

1986-05-20

Evans, A.

Recorders

Thermal recording

400120, B41J 320

Patent

active

045904880

ABSTRACT:
An electrical circuit for controlling the energization of thermal print head elements on a thermal print head. The circuit is responsive to the overall temperature of a thermal print head for varying the amounts of energy supplied the print head elements thereof so that markings of substantially uniform darkness can be produced on thermally sensitive sheets regardless of the overall head temperature. The circuit is operative in response to a start signal for producing a predetermined number of sequential pulses of substantially uniform duration during a printing cycle to sequentially energize different groups of print head elements at different times during the cycle. The voltage level of the pulses in the cycles is maintained substantially constant, whereas the duration of the pulses in different cycles is varied to vary the amounts of energy supplied to the print head elements.

REFERENCES:
patent: 4113391 (1978-09-01), Minowa

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