KF2002-GF94A printheads 1/4 compact low voltage thick film thermal printhead (8dots / mm) KF2002-GF94A KF2002-GF94A of low voltage thermal printheads have a 1.25-mm pitch connectors and reduced power supply circuit voltage requirements. this makes them useful for a wide range of applications, including cat, fet-pos and naturally, handheld devices that demand printer heads which can operate with low supplied voltage. ! ! ! ! applications mobile printers fet-pos printers hand-held printers debit printers ! ! ! ! features 1) both the circuit voltage and the voltage required during printing are 3.3v ; this allows the design of complete printer assemblies with energy-saving low power consumption. 2) KF2002-GF94A has a resistance value of 176 ? and can take a maximum current of 8.5v for printing. this is useful in applications where the peak voltage is restricted. 3) because the connectors accept 1.25-mm pitch ffc (full flat cables) it is possible to reduce the size of printer mechanism control boards. ! ! ! ! external dimensions (units : mm) (7.35) (1.1) max.1.7 exposed conductor side insert direction (10) max. 8.0 1.4 0.3 max.12.5 no.21 no.1 connector 54 48 (effective print width) dot #1 dot #384
KF2002-GF94A printheads 2/4 ! ! ! ! equivalent circuit vh gnd v dd stb6 stb5 stb4 stb3 stb2 stb1 clk di lat do tm tm dot #384 dot #1 thermistor 30k ? b:3950 fig.1 6 5 4 2 3 1 latch register shift register
KF2002-GF94A printheads 3/4 ! ! ! ! pin assignments no. 12 v dd stb4 stb5 stb6 gnd gnd clk di vh vh 13 14 15 16 17 18 19 20 21 circuit lat no. 1vh vh do gnd gnd stb1 stb3 tm 2 3 4 5 6 7 8 9 10 11 circuit tm stb2 note) the gnd terminal 5 and 6 are not connected with the gnd terminal 16 and 17. these terminals shall be connected each other at the closest point to the printhead. ! ! ! ! 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
KF2002-GF94A 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 48 0.125 384 176 7.2 0.23 1.25 0.56 64 8 8.0 50/1 10 8 0~50 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 : 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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