ROHM KF2004

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 800Ω ± 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)
5.1±0.4
4±0.2
(7)
DOT #1
Ma
x.φ
20
.0
2.6±0.1
Max. 20
DOT #832
No.15
No.1
No.15
No.1
CONNECTOR A
4±0.2
110±0.2
5.1±0.1
(10.2)
CONNECTOR B
2-M3 (EFFECTIVE DEPTH 3)
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KF2004-GD45A
Printheads
!Equivalent circuit
DOT #832
12,13,14,15
VH
DOT #1
1,2,3,4
VH
12,13,14,15
GND
GND
1,2,3,4,5
STB6
10
9
STB1
STB5
9
10
STB2
STB4
8
11
STB3
7
6
5
4
3
LATCH REGISTER
11
DI
SHIFT REGISTER
TM
6
TM
7
2
1
6
LAT
5
7
DO
CLK
8
VDD
THERMISTOR
30kΩ B3950
CONNECTOR B
CONNECTOR A
Fig.1
!Pin assignments
CONNECTOR B
No.
Circuit
CONNECTOR A
No.
Circuit
1
GND
1
VH
2
GND
2
VH
3
GND
3
VH
4
GND
4
VH
5
GND
5
DO
6
TM
6
LAT
7
TM
7
CLK
8
STB4
8
VDD
9
STB5
9
STB1
10
STB6
10
STB2
11
DI
11
STB3
12
VH
12
GND
13
VH
13
GND
14
VH
14
GND
15
VH
15
GND
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KF2004-GD45A
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 setup LAT
t hold LAT
LATCH (LAT)
“High”:HOLD
“Low” :THROUGH
tw LAT
t setup STB
STROBE (STB)
tdo
tdo
DRIVER OUT
Fig.2
!Characteristics
Parameter
Symbol
Typical
Unit
Effective printing width
−
104
mm
Dot pitch
−
0.125
mm
−
832
dots
Rave
800
Ω
Total dot number
Average resistance value
Applied voltage
VH
24
V
Applied power
PO
0.61
W/dot
Print cycle
SLT
1.25
ms
Pulse width
TON
0.275
ms
Maximum number of dots energized simultaneously
−
448
dots
Maximum clock frequency
−
8
MHz
Maximum roller diameter
−
φ20.0
Running life / pulse life
−
50/5×10
km/pulses
Operating temperature
−
5~45
°C
mm
7
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KF2004-GD45A
Printheads
!Electrical characteristic curves
0.8
0.6
1.4
0.5
0.4
0.3
0.2
SLT : 1.25ms/line
0.7
0.6
ENERGY (mJ/dot)
1.6
OPTICAL DENSITY
ENERGY (mJ/dot)
0.8
1.8
Paper : KF50-HDA (OJI)
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