EP 0432024 B1 19940720 - System and method of contrast control for a thermal printhead.
Title (en)
System and method of contrast control for a thermal printhead.
Title (de)
Vorrichtung und Verfahren zur Kontrastregelung für einen Thermodruckkopf.
Title (fr)
Système et procédé de contrÔle du contraste pour une tête thermique d'écriture.
Publication
Application
Priority
FR 8916181 A 19891207
Abstract (en)
[origin: EP0432024A1] The subject of the invention is a method of contrast control for a print medium produced by a thermal print head (1) of a printer of a data transmission system comprising a series of resistive elements arranged to be activated by the passage of a current provided by a card (3) linked to a source of power (4) and in order thus to heat. The activation times of the elements are adjusted at the start of printing for a print cycle of minimal duration. For longer cycles, the elements are reactivated (14) as soon as their temperature while falling reaches the initial temperature, by a series of holding microcycles with very short durations of activation. If the printer of a fax machine is concerned, to which the invention applies particularly well, contrast can thus be adjusted as a function of the nature of the quality of the thermosensitive paper and of the rendering which it is desired to obtain with respect to an original document. <IMAGE>
IPC 1-7
IPC 8 full level
B41J 2/36 (2006.01)
CPC (source: EP)
B41J 2/36 (2013.01)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0432024 A1 19910612; EP 0432024 B1 19940720; AT E108728 T1 19940815; DE 69010859 D1 19940825; DE 69010859 T2 19950309; DK 0432024 T3 19941121; ES 2060113 T3 19941116; FR 2655592 A1 19910614; FR 2655592 B1 19950407
DOCDB simple family (application)
EP 90403412 A 19901130; AT 90403412 T 19901130; DE 69010859 T 19901130; DK 90403412 T 19901130; ES 90403412 T 19901130; FR 8916181 A 19891207