28-11-2013 дата публикации
Номер: US20130314473A1
Принадлежит:
A thick-film thermal printhead (FIG. ) and a variety of implementation approaches for controlling such a printhead. The conductive lead at each end of the heater element is switched to either the power supply (V) or ground, depending on the corresponding nib data bit with the advantage of eliminating leakage current completely. 1. A thick film thermal head structure comprising ,a heater nib line of resistive material,{'b': 1', '1101', '2', '1101', '1202', '1203, 'i': a', 'b, 'a plurality of contact points spaced along said nib line with spaces between said contact points defining nibs R (), R () . . . , each contact point electrically connected to a separate conductive lead (, ) which extends outwardly in the same direction away from one side of said nib line,'}{'sub': 'hd', 'a ground lead (Gnd) and a voltage lead (V), and,'}{'b': 1204', '1205', '1202', '1203, 'sub': 'hd', 'Single-Pole-Double-Throw (SPDT) switches (, ) each having a single pole connected to one of said conductive leads (, ) and having a switch arm which can be controlled to connect to either said ground lead (Gnd) or said voltage lead (V).'}2. The thermal head structure of further comprising claim 1 ,{'b': 1204', '1205', '1301', '1202', '1203', '1', '2, 'sub': 'hd', 'a control circuit which controls said Single-Pole-Double-Throw (SPDT) switches (, ), according to an exclusive-OR (XOR) logic function (), to connect each conductive lead (, ) to said ground lead (Gnd) or said voltage lead (V) so that current or no current is produced through said nibs (R, R . . . ) according to a desired data pattern.'}3. The thermal head structure of wherein claim 2 ,{'b': 1401', '1403', '1404', '1405', '1402', '1406', '1407', '1408, 'said control circuit is a driver Integrated Circuit (IC, ) including XOR gates (, , ), said Single-Pole-Double-Throw (SPDT) switches (), latch and strobe gates (, ), and a data shift register (), wherein,'}{'b': 1202', '1203, 'sub': 'hd', 'the control circuit is arranged and designed to ...
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