KF2008-GH40A Printheads Thick film thermal printhead (8dots / mm) KF2008-GH40A The KF2008-GH40A is a standard type A4-size thick-film thermal printhead, developed mainly for facsimiles. !Applications Facsimiles Electric whiteboard Measuring terminal printers !Features 1) A new pin connector structure greatly reduces the size and weight. 2) A newly developed 144-bit IC levels the strobe partition and reduces the noise level. 3) One rank resistance value of 3000Ω ± 3% eliminates the inconvenience of rank selection. !External dimensions (Units : mm) 230.5±0.3 (HEATSINK WIDTH) MAX 8.5 5.85±0.3 4.85±0.2 Dot #1 Dot #1728 . φ14 .0 LABEL RESIN COATING FOR PROTECTION OF PIN. No.9 No.1 CONNECTOR B RESIN COATING FOR PROTECTION OF IC. No.1 No.9 CONNECTOR A MAX 16±0.2 15.1±0.1 230 (SUBSTRATE WIDTH) 216 (EFFECTIVE PRINT WIDTH) 2.6±0.1 4.6±0.2 CENTER OF HEAT ELEMENTS 11.5±0.1 5±0.2 11.5±0.1 220.5±0.2 4-M3 1/4 KF2008-GH40A Printheads !Equivalent circuit VH GND DOT #1728 8,9 STB3 1,2 8,9 12 STB4 DOT #1 1,2 9 4 VH GND 1 5 6 6 5 STB1 STB2 4 LATCH REGISTER DI V DD TM LAT 3 7 SHIFT REGISTER CLK 4 7 3 TM THERMISTOR 30kΩ B:3950 CONNECTOR B CONNECTOR A Fig.1 !Pin assignments CONNECTOR B CONNECTOR A No. Circuit No. Circuit 1 VH GND 1 2 GND 2 VH 3 TM 3 CLK 4 VDD 4 LAT 5 STB4 5 STB2 6 STB3 6 STB1 7 DI 7 TM 8 VH 8 GND 9 VH 9 GND 2/4 KF2008-GH40A Printheads !Timing chart tw CLK CLOCK (CLK) t setup DI t hold DI DATA IN (DI) "High":BLACK "Low":WHITE t hold LAT t setup 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 − 216.0 mm Dot pitch − 0.125 mm Parameter − 1728 dots Rave 3000 Ω Applied voltage VH 24.0 V Applied power PO 0.17 W/dot Total dot number Average resistance value Print cycle SLT 10 ms Pulse width TON 1.95 ms Maximum number of dots energized simultaneously − 432 dots Maximum clock frequency − 4 MHz Maximum roller diameter − φ14.0 Running life / pulse life − 30/3×10 km/pulses Operating temperature − 5~45 °C mm 7 3/4 KF2008-GH40A Printheads !Electrical characteristic curves 1.4 0.5 0.45 1 SLT : 10ms/line 0.9 1.2 0.8 0.35 0.3 0.25 0.2 0.15 1 ENERGY (mJ / dot) OPTICAL DENSITY ENERGY (mJ / dot) 0.4 0.8 0.6 0.4 0.6 0.5 0.4 0.3 0.2 0.1 0.2 0.05 0 4 0.7 6 8 10 12 14 16 18 20 22 SCANNING LINE TIME (ms / line) 0 0 0.1 0.1 0.2 0.3 0.4 0.5 ENERGY (mJ / dot) Fig.3 Adaptive speed chart Fig.4 Representative density curve 0 0 5 10 15 20 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 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