KF2002-GF71A printheads 1/4 compact low voltage thick film thermal printhead (8dots / mm) KF2002-GF71A these compact, lightweight printheads have low power requirements and are intended for ecr and mobile applications. drawing 7.2v, a maximum print speed of 2 inches per second is possible. ! ! ! ! applications ecr printers hand-held printers ! ! ! ! features 1) a wide range of power supply voltage, from 4.2v-8.5v, can be used to drive the printhead. this gives the flexibility for use with printers designed to operate with power from various battery configurations. 2) to allow the design of compact printers for use in calculators and other mobile applications, the basic specifications of the unit have been standardized. this gives engineers greater freedom to develop mechanical designs. 3) one rank resistance value of 210 ? 4% eliminates the inconvenience of rank selection. ! ! ! ! external dimensions (units : mm) (7.35) exposed coductor side insert direction (10) (1.1) max. 8.0 1.4 0.3 max.12.5 no.21 no.1 connector max.1.7 54 48 (effective print width) dot #1 dot #384
KF2002-GF71A printheads 2/4 ! ! ! ! equivalent circuit vh gnd vdd stb2 stb1 lat di clk tm dot #384 dot #1 shift register fig.1 n.c. 1 2 3 stb3 latch register ! ! ! ! pin assignments no. 12 gnd gnd gnd tm v dd di vh vh vh 13 14 15 16 17 18 19 20 21 circuit lat no. 1vh vh vh n.c. clk stb2 gnd gnd 2 3 4 5 6 7 8 9 10 11 circuit gnd stb1 stb3
KF2002-GF71A 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 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 48 0.125 384 210 7.2 0.14 2.5 1.64 144 4 8.0 50/1 10 8 5~45 mm mm dots ? v w/dot ms ms dots mhz mm km/pulses c symbol typical unit ? ? ? ? ? ? ?
KF2002-GF71A 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 : 2.50ms/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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