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 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 650 3% eliminates the inconvenience of rank selection. 3) 2-inch, 3-inch and 4-inch series are available. !External dimensions (Units : mm)
118 104 (Effective Print Width)
Max.1.7 (5.1) Dot #1
2.60.1
Dot #832
Max.18
No.28
Connector
No.1
M
AX
.
20
.0
Insert Direction
Exposed Conductor Side
1100.2
40.2
5.10.1
2-M3 (Effective Depth 3)
10.2
1/4
KF2004-GF41A
Printheads
!Equivalent circuit
VH GND 1,2,3,4 25,26,27,28 7-11,19-22 DOT #832 DOT #1
VDD
7
15
6
5
4
3
2
1
STB2
18
STB1
12
LAT CLK DI2 DO2 DI1 DO1 TM TM
14 13 24 23 6 5 16 17
LATCH REGISTER
SHIFT REGISTER 2
SHIFT REGISTER 1
THERMISTOR
Fig.1
!Pin assignments
No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Circuit VH VH VH VH DI1 DO1 GND GND GND GND GND STB1 CLK LAT No. 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Circuit VDD TM TM STB2 GND GND GND GND DO2 DI2 VH VH VH VH
2/4
KF2004-GF41A
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
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 0.125 832 650 24 0.657 0.625 0.234 448 8 20.0 50/5x10 5~45
7
Unit mm mm dots V W/dot ms ms dots MHz mm km/pulses C
3/4
KF2004-GF41A
Printheads
!Electrical characteristic curves
0.8 Paper : KF50-HDA (OJI) 0.7 0.6
ENERGY (mJ/dot)
OPTICAL DENSITY
1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 1.8 SLT : 0.620ms/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 0.00
0.05
0.10
0.15
0.20
0.25
0.30
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 : (k)
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


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