KF2004-GF84A

KF2004-GF84A Printheads Compact low voltage thick film thermal printhead (8dots / mm) KF2004-GF84A KF2004-GF84A 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) KF2004-GF84A has a resistance value of 176Ω 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. 4) 2-inch, 3-inch and 4-inch series are available. !External dimensions (Units : mm) 117 Max.16.5 2.1±0.3 Dot #832 Dot #1 (1.1) (11.35) 104 (Effective Print Width) Max.1.7 Exposed Conductor Side φ1 4.0 No.28 No.1 Connector Ma Insert Direction x. 1/4 KF2004-GF84A Printheads !Equivalent circuit VH L-GND P-GND 1,2,3,26,27,28 18 13,14,15,16,17 13 24 23 12 11 3 2 1 DOT #832 DOT #1 STB7 STB6 STB2 STB1 AEO2 AEO1 LAT 9 8 20 19 5 LATCH REGISTER DI CLK DO VDD TM TM 25 6 4 7 11 12 THERMISTOR 30kΩ B:3950 SHIFT REGISTER Fig.1 !Pin assignments No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Circuit VH VH VH DO LAT CLK VDD STB1 STB2 STB3 TM TM P-GND P-GND No. 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Circuit P-GND P-GND P-GND L-GND AEO1 AEO2 STB4 STB5 STB6 STB7 DI VH VH VH L-GND : LOGIC GROUND P-GND : POWER GROUND 2/4 KF2004-GF84A Printheads !Timing chart tw CLK CLOCK (CLK) t setup DI DATA IN (DI) "High":BLACK "Low" :WHITE DATA OUT (DO) "High":BLACK "Low" :WHITE t hold DI td DO t setup LAT LATCH (LAT) "High":HOLD "Low" :THROUGH tw LAT STROBE (STB) t hold LAT t setup STB AEO tdo DRIVER OUT tdo Fig.2 !Characteristics Parameter 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 Symbol − − − Rave VH PO SLT TON − − − − − Typical 72 0.125 832 176 7.2 0.24 1.25 0.55 64 8 φ14.0 100/2×10 0~50 8 Unit mm mm dots Ω V W/dot ms ms dots MHz mm km/pulses °C 3/4 KF2004-GF84A Printheads !Electrical characteristic curves 0.8 Paper : KF50-HDA (OJI) 0.7 OPTICAL DENSITY 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 ENERGY (mJ/dot) 0.8 SLT : 1.25ms/line 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.05 0.10 0.15 0.20 0.25 0.30 0.6 ENERGY (mJ/dot) 0.5 0.4 0.3 0.2 0.1 0 0 1 2 3 4 5 0.0 0.00 0 0 1 2 3 4 5 SCANNING LINE TIME (ms/line) ENERGY (mJ/dot) SCANNING LINE TIME (ms/line) Fig.3 Adaptive speed chart Fig.4 Representative density curve Fig.5 Maximum energy curve 180 160 140 RESISTANCE : (kΩ) 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