KF2003-GD45A printheads 1/4 compact medium speed thick film thermal printhead (8 dots / mm) KF2003-GD45A using its expertise in lsi technology, rohm has developed new high density driver chips for use in the KF2003-GD45A . capable of being employed for both thermal and thermal transfer printing, with a print speed of 200mm/s, the resulting print heads are the fastest in their class. this high-speed and high-density printing answers the needs of pos, atm, kiosk and ticket printing devices, which are increasingly being called upon to produce graphical output. ! ! ! ! applications pos printers atm printers kiosk printers ticket printers ! ! ! ! features 1) the use of a special partial glaze and the latest heating element structure, along with new high-density driver chips that can accept big current, has allowed rohm to achieve print speeds of 200mm/s with using thermal history control, the fastest in its class. 2) standard printheads in the line up are capable of 203 or 300 dpi. they achieve the high resolution needed for graphics and other complex print patterns. 3) one rank resistance value of 800 ? 3% eliminates the inconvenience of rank selection. 4) 2-inch, 3-inch and 4-inch series are available. ! ! ! ! external dimensions (units : mm) 65 56 (effective print width) 55 0.2 2 ? m3 (effective depth 3) 5 0.2 5.1 0.1 (10.2) dot #448 2.6 0.1 max.20 dot #1 connector b connector a no.15 no.1 no.1 no.15 5.1 0.4 4 0.2 max. 20.0
KF2003-GD45A printheads 2/4 ! ! ! ! equivalent circuit vh gnd stb5 stb4 di nc tm tm vh gnd stb2 stb1 stb3 lat do clk v dd 12,13,14,15 1,2,3,4, 5 9 8 11 10 6 7 thermistor 30k ? b3950 connector b connector a dot #640 dot #1 1,2,3,4 12,13,14,15 9 10 11 6 5 7 8 latch register shift register fig.1 54 321 ! ! ! ! pin assignments no. 1vh vh vh vh do lat clk v dd stb1 stb2 stb3 gnd gnd gnd gnd 2 3 4 5 6 7 8 9 10 11 12 13 14 15 circuit no. 1 gnd connector b connector a gnd gnd gnd gnd tm tm stb5 di vh vh vh vh 2 3 4 5 6 7 8 9 10 11 12 13 14 15 circuit n.c. stb4
KF2003-GD45A printheads 3/4 ! ! ! ! timing chart clock (clk) data in (di) ?high?:black ?low? :white data out (do) ?high?:black ?low? :white latch (lat) strobe (stb) driver out ?high?:hold ?low? :through tw clk t hold di t setup di td do t setup lat t hold lat tw lat t setup stb tdo tdo fig.2 ! ! ! ! characteristics parameter ? ? ? rave v h p o slt t on ? ? ? ? ? 80 0.125 640 800 24 0.63 1.25 0.275 384 8 20 50/5 10 7 5~45 mm mm dots ? v w/dot ms ms dots mhz mm km/pulses c symbol typical unit operating temperature running life / pulse life maximum roller diameter maximum clock frequency maximum number of dots energized simultaneously pulse width print cycle applied power applied voltage average resistance value total dot number effective printing width dot pitch
KF2003-GD45A printheads 4/4 ! ! ! ! electrical characteristic curves paper : kf50-hda (oji) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 012345 scanning line time ( ms/line) energy ( mj/dot) fig.3 adaptive speed chart 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 0.00 0.05 0.10 0.15 0.20 0.25 0.30 energy ( mj/dot) optical density slt : 1.25ms/line fig.4 representative density curve 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 012345 scanning line time ( ms/line) energy ( mj/dot) fig.5 maximum energy curve 0 20 40 60 80 100 120 140 160 180 ? 20 ? 10 10 30 50 70 0204060 temperature : ( c) resistance : (k ? ) fig.6 thermistor curve
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