KF2008-GH40A printheads 1/4 thick film thermal printhead (8dots / mm) KF2008-GH40A the KF2008-GH40A is a standard type a4-size thick-film thermal printhead, developed mainly for facsimiles. ! ! ! ! applications facsimiles electric whiteboard measuring terminal printers ! ! ! ! features 1) a new pin connector structure greatly reduces the size and weight. 2) a newly developed 144-bit ic levels the strobe partition and reduces the noise level. 3) one rank resistance value of 3000 ? 3% eliminates the inconvenience of rank selection. ! ! ! ! external dimensions (units : mm) 15.1 0.1 16 0.2 connector b no.1 no.9 label resin coating for protection of ic. resin coating for protection of pin. dot #1728 216 (effective print width) 230 (substrate width) 230.50.3 (heatsink width) connector a no.1 no.9 max 8.5 5.85 0.3 4.85 0.2 4.6 0.2 2.6 0.1 max. 14.0 4-m3 center of heat elements 11.5 0.1 11.5 0.1 220.5 0.2 5 0.2 dot #1
KF2008-GH40A printheads 2/4 ! ! ! ! equivalent circuit vh gnd stb4 stb3 di v dd tm vh 8,9 1,2 6 8,9 5 4 3 7 dot #1728 dot #1 1,2 5 6 4 7 latch register shift register 30k ? b:3950 thermistor connector b connector a 3 gnd stb1 stb2 lat clk tm fig.1 1 9 4 12 the stb terminals are pulled up inside the ic. ! ! ! ! pin assignments connector b no. 1 2 3 4 5 6 7 8 9 circuit connector a no. 1 2 3 4 5 6 7 8 9 circuit gnd gnd tm v dd stb4 stb3 di vh vh vh vh tm clk lat stb2 stb1 gnd gnd
KF2008-GH40A printheads 3/4 ! ! ! ! timing chart clock (clk) tw clk t setup di t hold di t setup lat tw lat t setup stb tdo tdo t hold lat data in (di) "high":black "low":white latch (lat) "high":hold "low":through strobe (stb) driver out fig.2 ! ! ! ! characteristics parameter ? ? ? ? ? ? ? ? rave v h p o slt t on 216.0 0.125 1728 3000 24.0 0.17 10 1.95 432 4 14.0 30/3 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 total dot number effective printing width dot pitch average resistance value
KF2008-GH40A printheads 4/4 ! ! ! ! electrical characteristic curves scanning line time (ms / line) fig.3 adaptive speed chart 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 4 6 8 10 16 14 12 18 20 22 energy (mj / dot) slt : 10ms/line energy (mj / dot) fig.4 representative density curve 0 0.2 0.4 0.6 0.8 1 1.2 1.4 0 0.1 0.2 0.3 0.4 0.5 optical density fig.5 maximum energy curve 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0 5 10 15 20 scanning line time (ms / line) energy (mj / dot) 0 20 40 60 80 100 120 140 160 180 ? 20 ? 10 10 30 50 70 0204060 temperature : ( c) fig.6 thermistor curve resistance : (k ? )
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