KF3002-GD31A printheads 1/4 compact high speed thick film thermal printhead (12 dots / mm) KF3002-GD31A using its expertise in lsi technology, rohm has developed new high density driver chips for use in the KF3002-GD31A . 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. the high-speed and high-density printing answers the needs of atm, kiosk and ticket printing devices, which are increasingly being called upon to produce graphical output. ! ! ! ! applications label printers ticket printers terminal 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) one rank resistance value of 1250 ? 3% eliminates the inconvenience of rank selection. 3) 2-inch, 3-inch and 4-inch series are available. ! ! ! ! external dimensions (units : mm) 65 54.208 (effective print width) 55 0.2 2-m3 (effective depth 3) 5 0.2 5.1 0.1 (10.2) dot #640 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 18.0
KF3002-GD31A printheads 2/4 ! ! ! ! equivalent circuit vh gnd vdd stb4 stb3 di2 tm tm vh dot #640 dot #1 latch register shift register shift register thermistor 30k ? b:3950 connector b connector a gnd stb1 stb2 lat do1 di1 clk fig.1 do2 1 2 3 4 5 stb no. 1 1 256 257 384 385 512 513 640 2 3 4 dots / stb 256 128 128 128 dot no. di no. 1 1 384 385 640 2 dots / stb 384 256 dot no.
KF3002-GD31A printheads 3/4 ! ! ! ! pin assignments no. 1vh vh vh vh di1 do1 clk stb1 stb2 gnd gnd gnd gnd gnd 2 3 4 5 6 7 8 9 10 11 12 13 14 15 circuit lat no. 1 gnd connector b connector a gnd gnd gnd stb3 stb4 v dd tm di2 vh vh vh vh 2 3 4 5 6 7 8 9 10 11 12 13 14 15 circuit do2 tm ! ! ! ! timing chart clock (clk) data in (di) data out (do) latch (lat) "high":hold "low" :through "high":black "low" :white "high":black "low" :white strobe (stb) driver out tw clk t setup di t hold di td do t setup lat tw lat t setup stb tdo tdo t hold lat fig.2
KF3002-GD31A printheads 4/4 ! ! ! ! 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 54.208 0.0847 640 1250 24 0.42 0.82 0.308 640 8 18.0 50/5 10 7 5~45 mm mm dots ? v w/dot ms ms dots mhz mm km/pulses c symbol typical unit ? ? ? ? ? ? ? ! ! ! ! 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 : 0.82ms/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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