JPS6220840U - - Google Patents
Info
- Publication number
- JPS6220840U JPS6220840U JP11348585U JP11348585U JPS6220840U JP S6220840 U JPS6220840 U JP S6220840U JP 11348585 U JP11348585 U JP 11348585U JP 11348585 U JP11348585 U JP 11348585U JP S6220840 U JPS6220840 U JP S6220840U
- Authority
- JP
- Japan
- Prior art keywords
- thermal element
- print density
- thermal
- output
- constant
- 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
- 238000010586 diagram Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
Landscapes
- Electronic Switches (AREA)
Description
第１図は本考案の一実施例サーマルプリンタ印
字濃度制御回路の回路図、第２図は第１図の回路
の各部の電圧波形を示す説明図である。
１はワンシヨツト・マルチバイブレータ、２は
シフト・レジスタ、３はドライバ・アレイ、４は
サーマル素子、ＴＨはサーミスタ、Ｃはキヤパシ
タ、ＯＥはアウトプツト・イネーブル端子。
FIG. 1 is a circuit diagram of a thermal printer print density control circuit according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing voltage waveforms at various parts of the circuit of FIG. 1 is a one-shot multivibrator, 2 is a shift register, 3 is a driver array, 4 is a thermal element, TH is a thermistor, C is a capacitor, and OE is an output enable terminal.
Claims (1)
段に設けられた並列出力型シフトレジスタのアウ
トプツト・エネーブル端子に、前記サーマル素子
の近傍に配置された負の温度係数を有する素子に
よつて準安定期間の時定数が決定されるワンシヨ
ツト・マルチバイブレータの出力を接続すること
により、前記サーマル素子の印字用抵抗体に流す
電流を室温及び動作条件の変化に応じて制御し、
ほぼ一定の印字濃度の印刷を可能としてなるサー
マルプリンタ印字濃度制御回路。 During the metastable period, an element having a negative temperature coefficient placed near the thermal element is applied to the output enable terminal of a parallel output type shift register provided at the front stage of the driver array that drives the thermal element. By connecting the output of a one-shot multivibrator whose constant is determined, the current flowing through the printing resistor of the thermal element is controlled according to changes in room temperature and operating conditions,
A thermal printer print density control circuit that enables printing with almost constant print density.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11348585U JPS6220840U (en) | 1985-07-24 | 1985-07-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11348585U JPS6220840U (en) | 1985-07-24 | 1985-07-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6220840U true JPS6220840U (en) | 1987-02-07 |
Family
ID=30995337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11348585U Pending JPS6220840U (en) | 1985-07-24 | 1985-07-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6220840U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5393843A (en) * | 1977-01-28 | 1978-08-17 | Hitachi Ltd | Thermographic head |
| JPS5731074U (en) * | 1980-07-24 | 1982-02-18 |
-
1985
- 1985-07-24 JP JP11348585U patent/JPS6220840U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5393843A (en) * | 1977-01-28 | 1978-08-17 | Hitachi Ltd | Thermographic head |
| JPS5731074U (en) * | 1980-07-24 | 1982-02-18 |
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