KF2002-GR40A Printheads Compact medium speed thick film thermal printhead (8dots / mm) KF2002-GR40A The KF2002-GR40A is ideal for applications that require compact, lightweight thermal printheads, such as POS and label printer applications. The 2-, 3-, and 4-inch sizes have a resolution of 203dpi. This series is suitable for a wide range of applications. !Applications POS printers Label printers Receipt printers General purpose compact printers !Features 1) Both ROHM’s advanced LSI technology and proprietary partial glaze are used to realize higher printing efficiency. With a high print speed of 100mm/s, this series is also suitable for thermal transfer printing. 2) Besides the fact that harness-type direct connectors at either end allow wring to be fitted as convenient, the thermal printheads can be applied directly to the substrate without a heat sink. Both these features give engineers greater freedom when designing the printer mechanism. 3) One rank resistance value of 800Ω ± 3% eliminates the inconvenience of rank selection. !External dimensions (Units : mm) 60 (HEATSINK WIDTH) DOT #432 5.85 DOT #1 4.0 . φ1 2.6 Max No.7 No.7 No.1 CONNECTOR B 5 4.6 16 15.1 Max. 1.7 54 (EFFECTIVE PRINT WIDTH) No.1 CONNECTOR A 50 2-M3 1/4 KF2002-GR40A Printheads !Equivalent circuit VH GND DOT #432 7 STB2 1,2 7 1,2 3 STB3 DOT #1 2 VH GND 1 5 4 STB1 5 4 LATCH REGISTER DI V DD LAT 3 6 SHIFT REGISTER CLK 3 6 TM THERMISTOR 30kΩ B3950 CONNECTOR B CONNECTOR A Fig.1 !Pin assignments CONNECTOR B CONNECTOR A No. Circuit No. Circuit 1 GND 1 VH 2 GND 2 VH 3 VDD 3 CLK 4 STB3 4 LAT 5 STB2 5 STB1 6 DI 6 TM 7 VH 7 GND 2/4 KF2002-GR40A 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 Typical Unit Effective printing width − 54 mm Dot pitch − 0.125 mm Parameter Symbol − 432 dots Rave 800 Ω Applied voltage VH 24.0 V Applied power PO 0.64 W/dot Print cycle SLT 1.25 ms Pulse width TON 0.28 ms − 144 dots MHz Total dot number Average resistance value Maximum number of dots energized simultaneously Maximum clock frequency − 4 Maximum roller diameter − φ14.0 Running life / pulse life − 50/5×10 km/pulses Operating temperature − 0~50 °C mm 7 3/4 KF2002-GR40A Printheads !Electrical characteristic curves 0.8 0.8 1.8 Paper : KF50-HDA (OJI) 0.7 1.4 0.5 0.4 0.3 0.2 0.6 ENERGY (mJ/dot) OPTICAL DENSITY 0.6 ENERGY (mJ/dot) SLT : 1.25ms/line 1.6 0.7 1.2 1.0 0.8 0.6 1 2 3 4 5 SCANNING LINE TIME (ms/line) 0.0 0.00 0.05 0.10 0.15 0.20 0.25 0.30 ENERGY (mJ/dot) Fig.3 Adaptive speed chart 0.3 0.1 0.2 0 0 0.4 0.2 0.4 0.1 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