KF2004-GK42A

KF2004-GK42A Printheads Compact medium speed thick film thermal printhead (8dots / mm) KF2004-GK42A KF2004-GK42A is suitable for devices, such as high-speed POS and label printer applications, that require thermal printheads capable of higher printing rates. Improved power circuit design means that with heavier current it is possible to print at speeds as high as 150 mm/s. The GK Series is the thus ideal for label printers that need high printing rates. !Applications POS terminals, Label printers, CAT terminals, Multi-purpose small-sized printers !Features 1) Using a special compact partial glaze and new heating element structure, achieves high-speed printing at 150 mm/s. 2) The use of the newly developed highly-durable conductive protective film has improved countermeasures against static electricity. 3) The VH and GND sections of the power circuitry have been strengthened so that heavier current can be applied. 4) Ultra small connectors, designed to conform with FFCs, and miniature driver chips have been used. Although the resulting printheads are surprisingly compact and lightweight, they can be used with large platens of up to 20 mm in diameter. 5) One rank resistance value of 800Ω ± 3% eliminates the inconvenience of rank selection. 6) 2-inch, 3-inch and 4-inch series are available. !External dimensions (Units : mm) 118 Max.1.7 2.6±0.1 108 (Effective Print Width) Dot #864 Dot #1 (5.1) Max.17.5 No.28 Connector No.1 M ax .φ 20 .0 Insert Direction Exposed Conductor Side 110±0.2 4±0.2 5.1±0.1 2-M3 (Effective Depth 3) 10.2 1/4 KF2004-GK42A Printheads !Equivalent circuit VH GND 1, 2, 3, 4, 25, 26, 27, 28 11, 12, 13, 14, 15, 16, 17, 18, 19 DOT #864 DOT #1 4 STB4 STB3 STB2 STB1 22 23 8 9 3 2 1 144 OUTPUTS EACH LAT 7 LATCH REGISTER DI CLK DO V DD TM TM 24 6 5 21 10 20 SHIFT REGISTER THERMISTOR 30k Ω B :3950k CONNECTOR Fig.1 !Pin assignments No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Circuit VH VH VH VH DO CLK LAT STB2 STB1 TM GND GND GND GND No. 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Circuit GND GND GND GND GND TM VDD STB4 STB3 DI VH VH VH VH 2/4 KF2004-GK42A Printheads !Timing chart tw CLK CLOCK (CLK) t setup DI DATA IN (DI) "High":BLACK "Low" :WHITE t hold DI DATA OUT (DO) "High":BLACK "Low" :WHITE td DO t setup LAT LATCH (LAT) "High":HOLD "Low" :THROUGH tw LAT STROBE (STB) t setup STB t hold LAT 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 108 0.125 864 800 24.0 0.59 1.0 0.34 432 4 φ20.0 50/5×107 5~45 Unit mm mm dots Ω V W/dot ms ms dots MHz mm km/pulses °C 3/4 KF2004-GK42A 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 : 1.00ms/line 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 1 2 3 4 5 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 0.05 0.10 0.15 0.20 0.25 0.30 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