ROHM KF2002

KF2002-GF71A
Printheads
Compact low voltage thick film
thermal printhead (8dots / mm)
KF2002-GF71A
These compact, lightweight printheads have low power requirements and are intended for ECR and mobile applications.
Drawing 7.2V, a maximum print speed of 2 inches per second is possible.
!Applications
ECR printers
Hand-held printers
!Features
1) A wide range of power supply voltage, from 4.2V-8.5V, can be used to drive the printhead. This gives the flexibility for
use with printers designed to operate with power from various battery configurations.
2) To allow the design of compact printers for use in calculators and other mobile applications, the basic specifications of
the unit have been standardized. This gives engineers greater freedom to develop mechanical designs.
3) One rank resistance value of 210Ω ± 4% eliminates the inconvenience of rank selection.
!External dimensions (Units : mm)
54
Max.1.7
Dot #1
(7.35)
Dot #384
(1.1)
(10)
No.1
ax
No.21
.φ
8.
0
Exposed Coductor Side
M
MAX.12.5
1.4±0.3
48 (Effective Print Width)
Insert Direction
Connector
1/4
KF2002-GF71A
Printheads
!Equivalent circuit
DOT #384
VH
DOT #1
GND
3
VDD
2
1
STB3
STB2
STB1
LAT
LATCH REGISTER
DI
SHIFT REGISTER
CLK
N.C.
TM
Fig.1
!Pin assignments
No.
Circuit
No.
Circuit
1
VH
12
GND
2
VH
13
GND
3
VH
14
GND
4
N.C.
15
TM
5
CLK
16
VDD
6
LAT
17
STB3
7
STB2
18
DI
8
STB1
19
VH
9
GND
20
VH
10
GND
21
VH
11
GND
2/4
KF2002-GF71A
Printheads
!Timing chart
tw CLK
CLOCK (CLK)
t setup DI
t hold DI
DATA IN (DI)
"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
Symbol
Typical
Unit
Effective printing width
−
48
mm
Dot pitch
−
0.125
mm
−
384
dots
Rave
210
Ω
Parameter
Total dot number
Average resistance value
Applied voltage
VH
7.2
V
Applied power
PO
0.14
W/dot
Print cycle
SLT
2.5
ms
Pulse width
TON
1.64
ms
Maximum number of dots energized simultaneously
−
144
dots
Maximum clock frequency
−
4
MHz
Maximum roller diameter
−
φ8.0
mm
Running life / pulse life
−
50/1×108
km/pulses
Operating temperature
−
5~45
°C
3/4
KF2002-GF71A
Printheads
!Electrical characteristic curves
0.8
0.8
1.8
Paper : KF50-HDA (OJI)
0.7
1.4
0.5
0.4
0.3
0.6
ENERGY (mJ/dot)
OPTICAL DENSITY
0.6
ENERGY (mJ/dot)
SLT : 2.50ms/line
1.6
0.7
1.2
1.0
0.8
0.6
0.5
0.4
0.3
0.2
0.4
0.2
0.1
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
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
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
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document use silicon as a basic material.
Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level of
reliability and the malfunction of with would directly endanger human life (such as medical instruments,
transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other
safety devices), please be sure to consult with our sales representative in advance.
About Export Control Order in Japan
Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control
Order in Japan.
In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause)
on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
Appendix1-Rev1.0