Driving method of heat generating resistor in heat recording dev

Incremental printing of symbolic information – Ink jet – Ejector mechanism

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346 76PH, B41J 235

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053593529

ABSTRACT:
A method of driving heating resistors in a thermal recording apparatus comprising dividing a plurality of heating resistors into a plurality of separate blocks. The heating resistors in the blocks are driven by sequentially applying a pulse to each block to generate heat sequentially, whereby a current which is generated in the heating resistors by means of application of a constant voltage pulse changes from a first state with a large current to a second state with a small current in a stepwise-like manner within a pulse application time, and the plurality of blocks are sequentially driven so that the first state with a large current within the pulse application time of one block does not coincide with the first state within the pulse application time of another block. Also, the plurality of blocks may be sequentially driven so that the second state with a small current within the pulse application time of one block coincides with the first state with a large current within the pulse application time of a block which is next applied with a pulse.

REFERENCES:
patent: 4149171 (1979-04-01), Sato et al.
Patent Abstracts of Japan, vol. 14, No. 186 (M-962) (4129), Apr. 16, 1990.
Patent Abstracts of Japan, vol. 12, No. 27 (M-662) (2874), Jan. 27, 1988.
Patent Abstracts of Japan, vol. 10, No. 191 (M-495) (2247), Jul. 4, 1986.
Patent Abstracts of Japan, vol. 14, No. 172 (M-958) (4115), Apr. 4, 1990.

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