JPS60129276A - Driving circuit for thermal recording head - Google Patents
Driving circuit for thermal recording headInfo
- Publication number
- JPS60129276A JPS60129276A JP58237387A JP23738783A JPS60129276A JP S60129276 A JPS60129276 A JP S60129276A JP 58237387 A JP58237387 A JP 58237387A JP 23738783 A JP23738783 A JP 23738783A JP S60129276 A JPS60129276 A JP S60129276A
- Authority
- JP
- Japan
- Prior art keywords
- heating element
- thermal recording
- recording head
- temperature
- resistor
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
- B41J2/375—Protection arrangements against overheating
Landscapes
- Electronic Switches (AREA)
Abstract
Description
【発明の詳細な説明】
発明の属する技術分野
本発明は感熱記録方式の記録回路における記録ドライバ
回路に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording driver circuit in a thermal recording type recording circuit.
従来の技術
感熱記録ヘッドは、記録紙に黒を記録する場合ヘッドに
実装された発熱体へ任意の時間ドライブ電流を流して発
熱させることによシ記録させるが、規定以上の時間ドラ
イブ電流を流すと、発熱体が過熱して破損するおそれが
ある。Conventional thermal recording heads record black on recording paper by passing a drive current through a heating element mounted on the head for an arbitrary period of time to generate heat. Otherwise, the heating element may overheat and be damaged.
従来、との過熱による発熱体保護の方法として、ヘッド
本体にサーミスタなどの温度センサを密着させ、ヘッド
本体の温度が一定以上になった場合に記録を中断する方
法がとられていたために、ヘッドに実装された複数個の
発熱体の内、黒を印字している発熱体（ドライブ電流を
流している発熱体）が少ないと、そＱ発熱体が過熱状態
でも、ヘッド本体は、添置が上昇しないため発熱体を破
損させることがあった。Conventionally, the method of protecting the heating element from overheating was to attach a temperature sensor such as a thermistor to the head body and interrupt recording when the temperature of the head body exceeded a certain level. Among the multiple heating elements mounted on the head, if there are few heating elements printed in black (heating elements through which the drive current is flowing), even if the heating elements are overheated, the head body will be attached to the As a result, the heating element could be damaged.
発明の目的
本発明は従来の上記事情に鑑みてなされたものであシ、
従って本発明の目的は、記録用ドライノ（自体に発熱体
の温度が一定の温度を越えた場合。Purpose of the Invention The present invention has been made in view of the above-mentioned conventional circumstances.
Therefore, the object of the present invention is to record a dry nozzle (when the temperature of the heating element exceeds a certain temperature).
印字を停止させる機能を持たせることによシ、上記欠点
を解決し、感熱記録ヘッドの複数の発熱体の温度保護を
１ドツト単位で可能にした新規なドライバ回路を提供す
ることにある。It is an object of the present invention to provide a novel driver circuit which solves the above-mentioned drawbacks by providing a function to stop printing, and which makes it possible to protect the temperature of a plurality of heating elements of a thermal recording head in units of one dot.
発明の椿成
上記目的を達成する為に、本発明に係る感熱記録ヘッド
用ドライバ回路は、ドライバ搭載型感熱記録ヘッド用ド
ライバ回路にお−て、発熱体に該発熱体が規定以上の温
度になる印字信号を加えた場合に前記発熱体が一定温度
に達すると印字を停止させる温度保護回路を組み込んで
構成され、複数の発熱体の個々の破損を防ぐことを特徴
とする。SUMMARY OF THE INVENTION In order to achieve the above object, a driver circuit for a thermal recording head according to the present invention is a driver circuit for a thermal recording head equipped with a driver, in which the heating element is heated to a temperature higher than a specified value. The present invention is characterized in that it incorporates a temperature protection circuit that stops printing when the heating element reaches a certain temperature when a printing signal is applied to the heating element, thereby preventing individual damage to the plurality of heating elements.
発明の実施例
次に本発明をその好ましい一実施例について図面を参照
して詳細に説明する。Embodiment of the Invention Next, a preferred embodiment of the present invention will be described in detail with reference to the drawings.
本発明に係るドライバ回路の一実施例を第１図に示す。An embodiment of a driver circuit according to the present invention is shown in FIG.
第１図に示しだ回路例は一般的に多数の発熱体で構成さ
れる感熱記録ヘッドにおける１つの発熱体を駆動するド
ライバ回路であシ、抵抗１２に非直線抵抗（サーミスタ
）を使用することにより、発熱体が一定の温度に達する
と、発熱体への駆動を停止するものである。The circuit example shown in FIG. 1 is a driver circuit that drives one heating element in a thermal recording head that is generally composed of a large number of heating elements, and a nonlinear resistor (thermistor) is used as the resistor 12. Accordingly, when the heating element reaches a certain temperature, the drive to the heating element is stopped.
抵抗１２は１周囲温度が常温のとき高い抵抗値を持ち１
周囲温度が高くなると抵抗値が低くなるものである。増
幅器１３のスレッシュホールド電圧をｙｏとすれば１通
常、入力電圧（制御電位）ｂはスレッシュホールドレベ
ルＶＯよ’） 高＜ 、 抵抗１２の周囲温Ｋがある値
を越えたときに入力電圧すはスレッシュホールドレベル
ＶＯよシ低くなるように設定される。即ち、この場合、
抵抗１２の周囲温度がある値を越えるとＲ８クリツプフ
ロツプ１４がリセットされ、それによってＡＮＤゲート
１５ヲ閉じることにより１発熱体１７への駆動信号を停
止することができる。Resistor 12 has a high resistance value when the ambient temperature is normal temperature.
As the ambient temperature increases, the resistance value decreases. If the threshold voltage of the amplifier 13 is yo, then the input voltage (control potential) b is the threshold level VO') High <, and when the ambient temperature K of the resistor 12 exceeds a certain value, the input voltage is The threshold level is set to be lower than the threshold level VO. That is, in this case,
When the ambient temperature of resistor 12 exceeds a certain value, R8 clip-flop 14 is reset, thereby stopping the drive signal to heating element 1 17 by closing AND gate 15.
ただし、本回路を実現するには、発熱体１７の温度と、
非直線抵抗（サーミスタ）１２の周囲温度がほぼ比例す
ることが必要なために、ドライバ搭載型感熱記録ヘッド
の形態で、抵抗１２と発熱体１７を極力接近させて実装
する必要がある。However, in order to realize this circuit, the temperature of the heating element 17,
Since the ambient temperature of the non-linear resistor (thermistor) 12 needs to be approximately proportional, it is necessary to mount the resistor 12 and the heating element 17 as close as possible in the form of a driver-mounted thermal recording head.
第１図の各部の信号のタイミングチャートを箒２図に示
す。A timing chart of the signals of each part in FIG. 1 is shown in FIG. 2.
発明の効果
本発明は、以上説明したように、感熱記録ヘッドのドラ
イバ回路に発熱体の温度による保護（）能を持たせるこ
とによシ、感熱記録ヘッドの発熱体を１ドツト単位で保
護することができ、発熱記録 ！ヘッド制御回路のトラ
ブルなどによる発熱体の異常ドライブ（規定以上の印字
信号を与える）時に発熱体を有効に保護する効果がある
。Effects of the Invention As explained above, the present invention protects the heating element of the thermal recording head on a dot by dot basis by providing the driver circuit of the thermal recording head with the ability to protect the heating element according to the temperature of the heating element. You can record your fever! This effectively protects the heating element when the heating element is abnormally driven (giving a print signal higher than the specified value) due to trouble in the head control circuit.
第１図は本発明の一実施例を示した回路図である。
１１・・・固定抵抗、１２＠・・非直線抵抗（サーミス
タ）、１３−・・シュミット増幅器、１４・・・几Ｓフ
リッフリロップ、１５−−−ＡＮＤ回路、１６゜０・発
熱体駆動増幅器、１７−・・発熱体第２図は第１図にお
ける各部（ａ、ｂ、ｃ、ｄ。
ｅ）のタイミングチャートである。
ａ・・・印字信号、ｂ・・・制御電位、Ｃ・・・印字中
断は号、ｄ・・・ドライバ大刀信号、Ｃ９・・ドライバ
出力信号
特許出願人 日本電気株式会社
代 理 人 弁理士 熊谷雄太部
第１図
Ｆ゛ライｌへカｔ１号ｄ
ドライｌ−′出ｔげ信号ｅ
第２図FIG. 1 is a circuit diagram showing one embodiment of the present invention. 11...Fixed resistance, 12@...Non-linear resistance (thermistor), 13-...Schmitt amplifier, 14...S flip-flop, 15--AND circuit, 16°0/heating element drive amplifier, 17--Heating element FIG. 2 is a timing chart of each part (a, b, c, d, e) in FIG. 1. a...Print signal, b...Control potential, C...Print interruption number, d...Driver long sword signal, C9...Driver output signal Patent applicant NEC Co., Ltd. Representative Patent attorney Kumagai Thick part Fig.1
Claims (1)
、発熱体に該発熱体が規定□以上の温度になる印字信号
が加えられた場合に前記発熱体のドライブを中断させる
温度保護回路を付加したことを特徴とする感熱記録ヘッ
ド用ドライバ回路。A driver circuit for a driver-equipped thermal recording head is characterized in that a temperature protection circuit is added that interrupts the drive of the heating element when a print signal that causes the heating element to reach a temperature above a specified value is applied to the heating element. A driver circuit for a thermal recording head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58237387A JPS60129276A (en) | 1983-12-16 | 1983-12-16 | Driving circuit for thermal recording head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58237387A JPS60129276A (en) | 1983-12-16 | 1983-12-16 | Driving circuit for thermal recording head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60129276A true JPS60129276A (en) | 1985-07-10 |
Family
ID=17014632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58237387A Pending JPS60129276A (en) | 1983-12-16 | 1983-12-16 | Driving circuit for thermal recording head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60129276A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63303769A (en) * | 1987-06-05 | 1988-12-12 | Hitachi Ltd | Thermal printer |
-
1983
- 1983-12-16 JP JP58237387A patent/JPS60129276A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63303769A (en) * | 1987-06-05 | 1988-12-12 | Hitachi Ltd | Thermal printer |
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