KF2002-GK42A printheads 1/4 compact medium speed thick film thermal printhead (8dots / mm) KF2002-GK42A KF2002-GK42A is suitable for devices, such as high-speed pos and label printer applications, that require thermal printheads capable of higher printing rates. improved power circuit design means that with heavier current it is possible to print at speeds as high as 150 mm/s. the gk series is the thus ideal for label printers that need high printing rates. ! ! ! ! applications pos terminals, label printers, cat terminals, multi-purpose small-sized printers ! ! ! ! features 1) using a special compact partial glaze and new heating element structure, achieves high-speed printing at 150 mm/s. 2) the use of the newly developed highly-durable conductive protective film has improved countermeasures against static electricity. 3) the vh and gnd sections of the power circuitry have been strengthened so that heavier current can be applied. 4) ultra small connectors, designed to conform with ffcs, and miniature driver chips have been used. although the resulting printheads are surprisingly compact and lightweight, they can be used with large platens of up to 20 mm in diameter. 5) one rank resistance value of 800 ? 3% eliminates the inconvenience of rank selection. 6) 2-inch, 3-inch and 4-inch series are available. ! ! ! ! external dimensions (units : mm) connector 65 insert direction exposed conductor side 10.2 55 0.2 (5.1) 2-m3 (effective depth 3) 5.1 0.1 5 0.2 max.1.7 54 (effective print width) max. 20.0 no.1 dot #432 dot #1 max.17.5 2.6 0.1 no.28
KF2002-GK42A printheads 2/4 ! ! ! ! equivalent circuit vh gnd v dd stb2 stb1 lat di do clk tm tm dot #432 dot #1 fig.1 n.c. 1 2 3 stb3 latch register shift register thermistor 30k ? b:3950k connector 1, 2, 3, 4, 25, 26, 27, 28 11, 12, 13, 14, 15, 16, 17, 18, 19 8 22 23 9 7 24 6 5 21 10 20 144 outputs each ! ! ! ! pin assignments no. 15 gnd gnd gnd tm tm v dd di do vh 16 17 18 19 20 21 22 23 24 vh vh vh 25 26 27 28 circuit lat no. 1vh vh vh vh n.c. clk stb2 gnd 2 3 4 5 6 7 8 9 10 11 12 13 14 circuit gnd gnd gnd gnd gnd stb1 stb3
KF2002-GK42A printheads 3/4 ! ! ! ! timing chart clock (clk) data in (di) latch (lat) "high":hold "low" :through "high":black "low" :white strobe (stb) driver out tw clk t setup di t hold di data out (do) "high":black "low" :white td do t setup lat tw lat t setup stb tdo tdo t hold lat fig.2 ! ! ! ! characteristics effective printing width dot pitch total dot number average resistance value applied voltage applied power print cycle pulse width maximum number of dots energized simultaneously maximum clock frequency maximum roller diameter running life / pulse life operating temperature parameter ? rave v h p o slt t on 54 0.125 432 800 24.0 0.59 1.0 0.43 432 4 20.0 50/5 10 7 5~45 mm mm dots ? v w/dot ms ms dots mhz mm km/pulses c symbol typical unit ? ? ? ? ? ? ?
KF2002-GK42A 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 : 1.00ms/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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