Controlling method for heat of thermal head

Details Controlling method for heat of thermal head Controlling method for heat of thermal head

1995-12-27

1997-05-20

Tran, Huan H.

Incremental printing of symbolic information

Thermal marking apparatus or processes

Having driving circuitry for recording means

347180, B61J 2355

Patent

active

056316895

ABSTRACT:
A method for controlling heat generated by the heat-generating elements of a thermal head, the elements being successively actuated to heat the thermal head in response to an electrical current which is applied to each of the plurality elements from a control circuit for a power-on time which is n times a minimum time period. The method includes determining a calculated power-on time for a selected element and assigning the power-on time for the selected element one of: a value equal to the calculated power-on time if the calculated power-on time is equal to n times the minimum time period; a value equal to the calculated power-on time, rounded up to a nearest multiple of the minimum time period, if the calculated power-on time is not equal to n times the minimum time period, and if the selected element is an even-numbered one of said plurality of elements; and an actual power-on time equal to the calculated power-on time, rounded down to a nearest multiple of the minimum time period, if the calculated power-on time is not equal to n times the minimum time period, and if the selected element is an odd-numbered one of said plurality of elements.

REFERENCES:
patent: 4816843 (1989-03-01), Sasaki

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