EP 0320435 B1 19911121 - THERMAL PRINTER
Title (en)
THERMAL PRINTER
Publication
Application
Priority
DE 3741799 A 19871207
Abstract (en)
[origin: US4887092A] In a prior art thermal printing method, the heating elements of a thermal printing head are driven in such fashion that the temperature of each and every individual heating element is first measured individually and successively before this heating element is charged with a current pulse whose intensity of current is dimensioned dependent on the measured temperature. In order to increase the printing speed, the temperatures of all heating elements (R1 . . . Rn) are first successively measured in the novel method fo the present invention in every drive cycle and are extrapolated to isochronic cooling temperature values dependent on the cooling characteristic of the heating elements (R1 . . . Rn). The heating elements (R1 . . . Rn) are then charged with current pulses whose pulse durations are individually dimensioned for every heating element (R1 . . . Rn) dependent on the cooling temperature value calculated for this heating element (R1 . . . Rn).
IPC 1-7
IPC 8 full level
B41J 2/355 (2006.01); B41J 2/365 (2006.01)
CPC (source: EP US)
B41J 2/365 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0320435 A1 19890614; EP 0320435 B1 19911121; DE 3741799 A1 19890615; DE 3866338 D1 19920102; US 4887092 A 19891212
DOCDB simple family (application)
EP 88730271 A 19881205; DE 3741799 A 19871207; DE 3866338 T 19881205; US 28081688 A 19881207