EP 0473191 A1 19920304 - Driving apparatus for a thermal print head, and driving method for the same.
Title (en)
Driving apparatus for a thermal print head, and driving method for the same.
Title (de)
Steueranordnung und -verfahren für Thermodruckkopf.
Title (fr)
Dispositif et méthode de commande pour tête d'imprimante thermique.
Publication
Application
Priority
JP 22866890 A 19900830
Abstract (en)
A driving apparatus for a thermal print head comprises a data supplying circuit (11, 12) for supplying a line of dot data to the thermal print head (13) in each drive cycle, which data specifies which one of heating elements (14) of the thermal print head is (13) used to print a dot, and enabling the thermal print head (13) to energize the heating elements (14) specified by the dot data line for a first energizing time from the time when the dot data line is supplied. In the driving apparatus, a replacing circuit (21, 22) is provided to replace the dot data line supplied to the thermal print head (13) by inverted data of the dot data line supplied in the drive cycle preceded by one cycle when a second energizing time has elapsed from the time at which the line of dot data is supplied from the data supplying circuit (11, 12) to the thermal print head (13), wherein the second energizing time is set to a length suitable for printing a dot by the heating element (14) in a preheated state, and the first energizing time is set longer than the second energizing time by a length suitable for preheating the heating element (14). <IMAGE>
IPC 1-7
IPC 8 full level
B41J 2/36 (2006.01); B41J 2/355 (2006.01); B41J 2/38 (2006.01)
CPC (source: EP)
B41J 2/355 (2013.01)
Citation (search report)
- [XP] JP H01160657 A 19890623 - TOSHIBA CORP
- [X] US 4560993 A 19851224 - HAKOYAMA AKIYOSHI [JP]
- [X] EP 0367833 A1 19900516 - SONY CORP [JP]
- [X] US 4634063 A 19870106 - WATANABE HIDEJI [JP], et al
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
DOCDB simple family (application)
EP 91114657 A 19910830; JP 22866890 A 19900830