JPS59146140U - Short circuit detection device for thermal head drive circuit - Google Patents
Short circuit detection device for thermal head drive circuitInfo
- Publication number
- JPS59146140U JPS59146140U JP3959383U JP3959383U JPS59146140U JP S59146140 U JPS59146140 U JP S59146140U JP 3959383 U JP3959383 U JP 3959383U JP 3959383 U JP3959383 U JP 3959383U JP S59146140 U JPS59146140 U JP S59146140U
- Authority
- JP
- Japan
- Prior art keywords
- thermal head
- head drive
- detection device
- circuit
- drive circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Testing Of Individual Semiconductor Devices (AREA)
- Accessory Devices And Overall Control Thereof (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は、従来のサーマルヘッド駆動回路を示す図、第
２図は本考案サーマルヘッド駆動回路の短絡検知装置の
一実施例を示す回路図である。
１・・・駆動チップ、２・・・シフトレジスタ、３・・
・ラッチレジスタ、４・・・ＡＮＤゲート、５・・・駆
動トランジスタ、６・・・発熱抵抗体、７・・・共通電
極、８・・・データイン、９・・・クロック、１０・・
・ラッチ、１１・・・ストローブ、１２・・・ダイオー
ド、１３・・・比較回路（ＮＯＲゲート）、１４・・・
アラーム。FIG. 1 is a diagram showing a conventional thermal head drive circuit, and FIG. 2 is a circuit diagram showing an embodiment of a short circuit detection device for a thermal head drive circuit according to the present invention. 1...Drive chip, 2...Shift register, 3...
・Latch register, 4...AND gate, 5...drive transistor, 6...heating resistor, 7...common electrode, 8...data in, 9...clock, 10...
・Latch, 11... Strobe, 12... Diode, 13... Comparison circuit (NOR gate), 14...
alarm.
Claims (1)
マルヘッド駆動回路において、それぞれ駆動トランジス
タのコレクタ端子にダイオードを接続し、その対極のア
ノードを共通線とし、この共通線と印加時間を決定する
ストローブ信号とを比較回路により条件比較せしめ、前
記駆動用トランジスタのコレクタ、エミッタ間の短絡を
検知スるようにしたことを特徴とするサーマルヘッド駆
動回路の短絡検知装置。In a thermal head drive circuit consisting of a thermal head drive chip and a heating resistor, a diode is connected to the collector terminal of each drive transistor, and the opposite anode is used as a common line, and this common line and a strobe signal that determines the application time are connected. A short-circuit detection device for a thermal head drive circuit, characterized in that a comparison circuit compares the conditions, and a short-circuit between the collector and emitter of the drive transistor is detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3959383U JPS59146140U (en) | 1983-03-22 | 1983-03-22 | Short circuit detection device for thermal head drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3959383U JPS59146140U (en) | 1983-03-22 | 1983-03-22 | Short circuit detection device for thermal head drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59146140U true JPS59146140U (en) | 1984-09-29 |
Family
ID=30170231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3959383U Pending JPS59146140U (en) | 1983-03-22 | 1983-03-22 | Short circuit detection device for thermal head drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59146140U (en) |
-
1983
- 1983-03-22 JP JP3959383U patent/JPS59146140U/en active Pending
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