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KF2004-GD45A
Printheads
Compact medium speed thick film thermal printhead (8 dots / mm)
KF2004-GD45A
Using its expertise in LSI technology, ROHM has developed new high density driver chips for use in the KF2004-GD45A . Capable of being employed for both thermal and thermal transfer printing, with a print speed of 200mm/s, the resulting print heads are the fastest in their class. This high-speed and high-density printing answers the needs of POS, ATM, KIOSK and ticket printing devices, which are increasingly being called upon to produce graphical output. !Applications POS printers ATM printers KIOSK printers Ticket 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 with using thermal history control, the fastest in its class. 2) Standard printheads in the line up are capable of 203 or 300 dpi. They achieve the high resolution needed for graphics and other complex print patterns. 3) One rank resistance value of 800 3% eliminates the inconvenience of rank selection. 4) 2-inch, 3-inch and 4-inch series are available. !External dimensions (Units : mm)
118 104 (EFFECTIVE PRINT WIDTH) (7) DOT #832
Max. 20 2.60.1
5.10.4 40.2
DOT #1
No.15 CONNECTOR B
No.1
No.15 CONNECTOR A
Ma
(10.2)
40.2
1100.2
2-M3 (EFFECTIVE DEPTH 3)
5.10.1
x. 20 .0
No.1
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KF2004-GD45A
Printheads
!Equivalent circuit
VH GND 12,13,14,15 1,2,3,4,5 DOT #832 DOT #1 1,2,3,4 12,13,14,15 VH GND
7
STB6 10
6
5
4
3
2
1
9 STB1
STB5
9
10
STB2
STB4
8
11
STB3
LATCH REGISTER DI 11 SHIFT REGISTER
6 5 7 8
LAT DO CLK VDD
TM TM
6 7 THERMISTOR 30k B3950 CONNECTOR A
CONNECTOR B
Fig.1
!Pin assignments
CONNECTOR B No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Circuit GND GND GND GND GND TM TM STB4 STB5 STB6 DI VH VH VH VH CONNECTOR A No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Circuit VH VH VH VH DO LAT CLK VDD STB1 STB2 STB3 GND GND GND GND
2/4
KF2004-GD45A
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 setup LAT LATCH (LAT) "High":HOLD "Low" :THROUGH tw LAT STROBE (STB) t setup STB t hold LAT t hold DI
td DO
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 104 0.125 832 800 24 0.61 1.25 0.275 448 8 20.0 50/5x10 5~45
7
Unit mm mm dots V W/dot ms ms dots MHz mm km/pulses C
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KF2004-GD45A
Printheads
!Electrical characteristic curves
0.8 Paper : KF50-HDA (OJI) 0.7 0.6
ENERGY (mJ/dot) OPTICAL DENSITY
1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 SLT : 1.25ms/line
0.8 0.7 0.6
ENERGY (mJ/dot)
0.5 0.4 0.3 0.2 0.1 0 0 1 2 3 4 5
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 : (k)
120 100 80 60 40 20 0 -20 -10 0 10 20 30 40 50 60 70
TEMPERATURE : (C)
Fig.6 Thermistor curve
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