| 摘要 |
PCT No. PCT/DE88/00484 Sec. 371 Date Mar. 8, 1990 Sec. 102(e) Date Mar. 8, 1990 PCT Filed Aug. 5, 1988 PCT Pub. No. WO89/02367 PCT Pub. Date Mar. 23, 1989.A printing apparatus having an electrothermically operated printing head (10) in the form of a bubble jet ink printing head or of a thermotransfer printing head comprises a plurality of individual heating elements (11) drivable in pulsed fashion, whereby an inking agent is locally heated in character-dependent fashion via the heating elements (11) during the writing mode and is transferred onto a recording medium (12) on the basis of the triggering of an aggregate change of state. A sensor (S) that acquires the change of state of the inking agent medium at each and every heating element (11) and that can be printer-independent generates a sensor signal allocated to the point in time of the change of state. The operating frequency of the printer is controlled dependent on the sensor signal. The identification of the change of state of the inking agent corresponds to a temperature measurement of the heating measurements.
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