KF2004-GF41A Printheads Compact high speed thick film thermal printhead (8dots / mm) KF2004-GF41A Using its expertise in LSI technology, ROHM has developed new high density driver chips for use in the KF2004-GF41A . Capable of being employed for both thermal and thermal transfer printing, with a print speed of 200mm/s, the resulting printheads 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 POS printers ATM printers KIOSK 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, the fastest in its class. 2) One rank resistance value of 650Ω ± 3% eliminates the inconvenience of rank selection. 3) 2-inch, 3-inch and 4-inch series are available. !External dimensions (Units : mm) Max.1.7 118 (5.1) Dot #832 Dot #1 4±0.2 Exposed Conductor Side 10.2 5.1±0.1 110±0.2 No.1 Insert Direction Connector M No.28 AX .φ 20 .0 Max.18 2.6±0.1 104 (Effective Print Width) 2-M3 (Effective Depth 3) 1/4 KF2004-GF41A Printheads !Equivalent circuit VH GND VDD STB2 STB1 LAT CLK DI2 DO2 DI1 DO1 TM TM 1,2,3,4 25,26,27,28 DOT #832 DOT #1 7-11,19-22 7 6 5 4 3 2 1 15 18 12 14 LATCH REGISTER 13 24 23 SHIFT REGISTER 2 SHIFT REGISTER 1 6 5 16 THERMISTOR 17 Fig.1 !Pin assignments No. Circuit No. Circuit 1 VH 15 VDD 2 VH 16 TM 3 VH 17 TM 4 VH 18 STB2 5 DI1 19 GND 6 DO1 20 GND 7 GND 21 GND 8 GND 22 GND 9 GND 23 DO2 10 GND 24 DI2 11 GND 25 VH 12 STB1 26 VH 13 CLK 27 VH 14 LAT 28 VH 2/4 KF2004-GF41A Printheads !Timing chart tw CLK CLOCK (CLK) t setup DI t hold DI DATA IN (DI) "High":BLACK "Low" :WHITE td DO DATA OUT (DO) "High":BLACK "Low" :WHITE t hold LAT t setup LAT LATCH (LAT) "High":HOLD "Low" :THROUGH tw LAT t setup STB STROBE (STB) tdo tdo DRIVER OUT Fig.2 !Characteristics Parameter Effective printing width Dot pitch Total dot number Average resistance value Symbol Typical Unit − 104 mm − 0.125 mm − 832 dots Rave 650 Ω Applied voltage VH 24 V Applied power PO 0.657 W/dot Print cycle SLT 0.625 ms Pulse width TON 0.234 ms Maximum number of dots energized simultaneously − 448 dots Maximum clock frequency − 8 MHz Maximum roller diameter − φ20.0 Running life / pulse life − 50/5×10 km/pulses Operating temperature − 5~45 °C mm 7 3/4 KF2004-GF41A Printheads !Electrical characteristic curves 0.8 0.8 1.8 0.6 1.4 0.5 0.4 0.3 0.2 0.1 0 0 1 2 3 4 5 SCANNING LINE TIME (ms/line) SLT : 0.620ms/line 0.7 0.6 ENERGY (mJ/dot) 1.6 OPTICAL DENSITY ENERGY (mJ/dot) Paper : KF50-HDA (OJI) 0.7 1.2 1.0 0.8 0.6 0.4 0.3 0.4 0.2 0.2 0.1 0.0 0.00 0.05 0.10 0.15 0.20 0.25 0.30 ENERGY (mJ/dot) Fig.3 Adaptive speed chart 0.5 Fig.4 Representative density curve 0 0 1 2 3 4 5 SCANNING LINE TIME (ms/line) Fig.5 Maximum energy curve 180 160 RESISTANCE : (kΩ) 140 120 100 80 60 40 20 0 −20 −10 0 10 20 30 40 50 60 70 TEMPERATURE : (°C) Fig.6 Thermistor curve 4/4