JPH01128851A - Applied voltage adjustor for thermal printing head - Google Patents

Applied voltage adjustor for thermal printing head

Info

Publication number
JPH01128851A
JPH01128851A JP28791887A JP28791887A JPH01128851A JP H01128851 A JPH01128851 A JP H01128851A JP 28791887 A JP28791887 A JP 28791887A JP 28791887 A JP28791887 A JP 28791887A JP H01128851 A JPH01128851 A JP H01128851A
Authority
JP
Japan
Prior art keywords
voltage
elements
applied voltage
circuit
resistance value
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
Application number
JP28791887A
Other languages
Japanese (ja)
Inventor
Hidetaka Inoue
秀毅 井上
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Home Electronics Ltd
NEC Corp
Original Assignee
NEC Home Electronics Ltd
Nippon Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Home Electronics Ltd, Nippon Electric Co Ltd filed Critical NEC Home Electronics Ltd
Priority to JP28791887A priority Critical patent/JPH01128851A/en
Publication of JPH01128851A publication Critical patent/JPH01128851A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To enable adjustment with high accuracy, by connecting a dummy resistor to a common connection point of heat generating resistor elements, sequentially applying a predetermined voltage to the elements, calculating the average resistance of the elements on the basis of a voltage detected from a terminal for the dummy resistor, and adjusting an applied voltage for resistance heat generation on the basis of the average resistance. CONSTITUTION:An average resistance calculating circuit 24 outputs a mode switching signal SMC, a common connection point N of heat generating resistor elements is connected to a dummy resistor 20, and the circuit 24 instructs an applied voltage controlling circuit 12 to apply a voltage pulse for calculation of the average resistance of the elements to one of the elements, for example, the element R1. The voltage pulse is outputted from a terminal P1 of the circuit 12, whereby a voltage is generated across the dummy resistor 20, and is inputted to the circuit 24. On the basis of the voltage thus inputted, the resistance of the element R1 is calculated, and is stored into a buffer memory. Next, the circuit 12 is instructed to apply the voltage pulse to the element R2, and the resistance of the element R2 is thereby calculated. When the resistances of all of the elements are detected, the circuit 24 calculates the average of the resistances, and the circuit 12 adjusts an applied voltage for resistance heat generation. Thus, the need for troublesome manual adjustment is eliminated.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、発熱抵抗素子を発熱させて可視像(画像)を
用紙上に記録するサーマルラインプリンタのヘッドに関
し、特に発熱抵抗素子の平均抵抗値を割り出して抵抗発
熱用の印加電圧を自動調整するようにしたものである。
Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a head for a thermal line printer that records a visible image (image) on paper by generating heat from a heating resistor element, and particularly relates to a head for a thermal line printer that records a visible image (image) on paper by generating heat from a heating resistor element. The resistance value is determined and the applied voltage for resistance heating is automatically adjusted.

(従来の技術) この種のサーマルプリントヘッドはセラミック基板を本
体とし、その基板上に一列に多数(例えば1024個)
の発熱抵抗素子を薄膜技術により形成してなる。これら
の発熱抵抗素子は電気的に並列接続され、それぞれ画像
情報に応じて選択的に通電してその発熱エネルギに応じ
た濃度の画素を記録する。この発熱エネルギは、発熱抵
抗素子に印加される電圧のレベルまたはそのパルス幅に
よってきまる。
(Prior art) This type of thermal print head has a ceramic substrate as its main body, and a large number (for example, 1024) in a row on the substrate.
The heating resistor element is formed using thin film technology. These heat generating resistive elements are electrically connected in parallel and are selectively energized according to image information to record pixels with a density corresponding to the heat generated energy. This heating energy is determined by the level of the voltage applied to the heating resistor element or its pulse width.

(発明が解決しようとする問題点) ところで、精巧な薄膜技術によっても、ヘソド間で発熱
抵抗素子の抵抗値にバラツキが出てしまう。このバラツ
キがあると、一定の印加電圧に対して発熱エネルギにバ
ラツキが生じるため、同種の発熱ヘッドでも記録1度が
異なってくる。
(Problems to be Solved by the Invention) By the way, even with sophisticated thin film technology, variations in the resistance value of the heat generating resistor elements occur between the hemlocks. This variation causes variation in heat generation energy for a constant applied voltage, and therefore even the same type of heat generating head will perform different recording times.

従来、このようなバラツキを補正するため、組立てライ
ンにおいて測定された平均抵抗値を基に印加電圧をボリ
ュームで調整していた。
Conventionally, in order to correct such variations, the applied voltage was adjusted using a volume control based on the average resistance value measured on the assembly line.

しかし、このような調整は面倒で煩わしく、ライン作業
者に大きな負担がかかっている。
However, such adjustments are troublesome and troublesome, and place a heavy burden on line workers.

本発明は、かかる問題点に鑑みてなされたもので、サー
マルプリントヘッドの発熱抵抗素子の平均抵抗値を割り
出して抵抗発熱用の印加電圧を自動調整するようにした
印加電圧調整装置を提供することを目的とする。
The present invention has been made in view of such problems, and provides an applied voltage adjustment device that automatically adjusts the applied voltage for resistive heating by determining the average resistance value of the heating resistive elements of a thermal print head. With the goal.

(問題点を解決するための手段) 上記目的を達成するために本発明は、サーマルプリント
ヘッドの基板上に配置され電気的に並列接続された複数
の発熱抵抗素子に対する抵抗発熱用の印加電圧を調整す
る印加電圧調整装置において、それら複数の発熱抵抗素
子の平均抵抗値を割り出すためダミー抵抗をそれらの発
熱抵抗素子の共通接続点に接続するダミー抵抗接続手段
と;そのダミー抵抗が接続された状態で全部または一部
の発熱抵抗素子の各々に順次所定の電圧を印加する手段
と;ダミー抵抗の端子より逐次検出される電圧に基づい
て該平均抵抗値を演算する平均抵抗値割出手段と;該平
均抵抗値の演算値を基に該抵抗発熱用の印加電圧を制御
する電圧制御手段とを具備する構成とした。
(Means for Solving the Problems) In order to achieve the above object, the present invention applies a voltage applied for resistive heating to a plurality of heating resistive elements arranged on a substrate of a thermal print head and electrically connected in parallel. a dummy resistor connecting means for connecting a dummy resistor to a common connection point of the plurality of heat generating resistors in order to determine the average resistance value of the plurality of heat generating resistors in the applied voltage regulator to be adjusted; a state in which the dummy resistor is connected; Means for sequentially applying a predetermined voltage to each of all or some of the heating resistor elements; Average resistance value determining means for calculating the average resistance value based on the voltages sequentially detected from the terminals of the dummy resistors; The structure includes voltage control means for controlling the applied voltage for the resistance heating based on the calculated value of the average resistance value.

(作用) ダミー抵抗接続手段が動作してダミー抵抗が発熱抵抗素
子の共通接続点に接続された状態において、全部または
一部の発熱抵抗素子の各々に順次所定の電圧が印加され
ると、その印加された発熱抵抗素子とダミー抵抗との直
列回路に電流が流れダミー抵抗の両端子間にはその抵抗
値にその電流を乗じた値の電圧が生じる。この電圧の検
出値より該発熱抵抗素子の抵抗値が割り出される。
(Function) When the dummy resistor connecting means operates and the dummy resistor is connected to the common connection point of the heat generating resistor elements, when a predetermined voltage is sequentially applied to each of all or some of the heat generating resistor elements. A current flows through the series circuit of the applied heating resistor and the dummy resistor, and a voltage equal to the resistance value multiplied by the current is generated between both terminals of the dummy resistor. The resistance value of the heating resistor element is determined from the detected voltage value.

このようにして、電圧の印加される発熱抵抗素子が換わ
る度にダミー抵抗の端子より逐次電圧が検出され、各々
の発熱抵抗素子の抵抗値が割り出される。
In this way, each time the heating resistor element to which the voltage is applied changes, the voltage is sequentially detected from the terminal of the dummy resistor, and the resistance value of each heating resistor element is determined.

こうして得られた全ての抵抗値から当該ヘッドの発熱抵
抗素子の平均抵抗値が割り出され、この平均抵抗値に基
づいて抵抗発熱用(画像記録用)の印加電圧が調整され
る。すなわち、平均抵抗値が標準値よりも大きいときに
は印加電圧を低(し平均抵抗値が標準値よりも小さいと
きには印加電圧を高くして、印加電力(発熱エネルギ)
が標準値になるような調整が行われる。
The average resistance value of the heating resistor element of the head is determined from all the resistance values thus obtained, and the applied voltage for resistive heating (for image recording) is adjusted based on this average resistance value. In other words, when the average resistance value is larger than the standard value, the applied voltage is lowered (when the average resistance value is smaller than the standard value, the applied voltage is increased, and the applied power (heating energy)
Adjustment is made so that the value becomes the standard value.

(実施例) 以下、添付図を参照して本発明の一実施例を説明する。(Example) Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings.

図は、この実施例による印加電圧調整装置の構成を示す
The figure shows the configuration of an applied voltage adjusting device according to this embodiment.

サーマルプリントヘッド10の基板上には、多数、例え
ば1024個の発熱抵抗素子R1〜RI024が一列に
配置されている。これらの発熱抵抗素子R1−R102
4は互いに並列接続され、それぞれの一方の端子は印加
電圧制御回路12の電圧出力端子P1〜P 1024に
接続されるとともに、他方の端子は共通接続点Nを介し
てトランジスタ14゜16のそれぞれのコレクタに接続
される。
On the substrate of the thermal print head 10, a large number, for example, 1024 heating resistive elements R1 to RI024 are arranged in a row. These heating resistance elements R1-R102
4 are connected in parallel with each other, one terminal of each is connected to the voltage output terminals P1 to P 1024 of the applied voltage control circuit 12, and the other terminal is connected to each of the transistors 14 and 16 through a common connection point N. Connected to the collector.

トランジスタ14のエミッタは接地され、ペースは反転
回路18を介して平均抵抗値割出回路24のモード切替
出力端子MCに接続される。トランジスタ16のエミッ
タはダミー抵抗20の一方の端子に接続されるとともに
A/D変換器22の入力端子に接続され、ベースは平均
抵抗値割出回路24のモード切替出力端子MCに接続さ
れる。
The emitter of the transistor 14 is grounded, and the conductor is connected to the mode switching output terminal MC of the average resistance value determining circuit 24 via the inverting circuit 18. The emitter of the transistor 16 is connected to one terminal of the dummy resistor 20 and the input terminal of the A/D converter 22, and the base is connected to the mode switching output terminal MC of the average resistance value determining circuit 24.

ダミー抵抗20の抵抗値rdは既知であり、その他方の
端子は接地される。また、A/D変換器の出力端子は平
均抵抗値割出回路24のデータ入力端子DIに接続され
、平均抵抗値割出回路24のデータ/制御出力端子DC
は印加電圧制御回路12のデータ/制御入力端子DCに
接続される。
The resistance value rd of the dummy resistor 20 is known, and the other terminal is grounded. Further, the output terminal of the A/D converter is connected to the data input terminal DI of the average resistance value determining circuit 24, and the data/control output terminal DC of the average resistance value determining circuit 24.
is connected to the data/control input terminal DC of the applied voltage control circuit 12.

さて、この実施例による電圧調整は、電源の投入の都度
行われる。先ず、平均抵抗値割出回路24がモード切替
出力端子MCより論理値“H”のモード切替信号SMC
を出力する。これにより、トランジスタ16はオンにな
って共通接続点Nひいては発熱抵抗素子R1−R102
4の他方の端子をダミー抵抗20に接続する。一方、ト
ランジスタ14はオフで遮断状態となる。
Now, the voltage adjustment according to this embodiment is performed every time the power is turned on. First, the average resistance value determining circuit 24 outputs the mode switching signal SMC of logical value "H" from the mode switching output terminal MC.
Output. As a result, the transistor 16 is turned on, and the common connection point N and the heat generating resistor elements R1-R102 are turned on.
The other terminal of 4 is connected to the dummy resistor 20. On the other hand, the transistor 14 is off and in a cutoff state.

次に、平均抵抗値割出回路24は、印加電圧制御回路1
2に平均抵抗値割出用の電圧パルスを特定の1つの発熱
抵抗素子、例えばR1に印加すべきことを指示する制御
信号C8を与える。
Next, the average resistance value determining circuit 24 calculates the applied voltage control circuit 1.
2, a control signal C8 is applied to instruct that a voltage pulse for determining the average resistance value should be applied to a specific heating resistance element, for example, R1.

そうすると、印加電圧制御回路12の電圧出力端子PI
より、例えば20ボルトの電圧パルスが出力され、これ
により発熱抵抗素子R11トランジスタ16.ダミー抵
抗20を通ってアースに電流I+が流れ、ダミー抵抗2
0にはその抵抗値rdに電流IIを乗じた値の電圧V1
が発生する。
Then, the voltage output terminal PI of the applied voltage control circuit 12
, a voltage pulse of, for example, 20 volts is output, which causes the heating resistive element R11 transistor 16. Current I+ flows to ground through dummy resistor 20, and dummy resistor 2
0 is the voltage V1 of the value obtained by multiplying the resistance value rd by the current II.
occurs.

この電圧Vlは、A/D変換器22によりディジタル値
DV+に変換されて平均抵抗値割出回路24に入力され
る。平均抵抗値割出回路24は、この入力データDVl
を基に発熱抵抗素子R1の抵抗値rlを演算してその演
算値を内部のバッファメモリに格納し、次に印加電圧制
御回路12に平均抵抗値割出用の電圧パルスを発熱抵抗
素子R2に印加すべきことを指示する制御信号C8を与
える。
This voltage Vl is converted into a digital value DV+ by the A/D converter 22 and input to the average resistance value determining circuit 24. The average resistance value determining circuit 24 uses this input data DVl.
The resistance value rl of the heating resistor element R1 is calculated based on the calculated value, and the calculated value is stored in the internal buffer memory, and then the voltage pulse for determining the average resistance value is sent to the applied voltage control circuit 12 to the heating resistor element R2. A control signal C8 is provided to indicate what should be applied.

そうすると、印加電圧制御回路12の電圧出力端子P2
より上記と同じ電圧(20ボルト)のパルスが出力され
、これにより発熱抵抗素子R2、トランジスタ16.ダ
ミー抵抗20を通ってアースに電流■2が流れ、ダミー
抵抗20にはその抵抗値rdに電流■2を乗じた値の電
圧v2が発生し、その結果発熱抵抗素子R2の抵抗値r
2が平均抵抗値割出回路24で演算される。
Then, the voltage output terminal P2 of the applied voltage control circuit 12
A pulse of the same voltage (20 volts) as above is output from the heating resistor element R2, transistor 16. A current 2 flows to the ground through the dummy resistor 20, and a voltage v2 whose resistance value rd is multiplied by the current 2 is generated in the dummy resistor 20, resulting in a resistance value r of the heating resistor R2.
2 is calculated by the average resistance value determining circuit 24.

このようにして、発熱抵抗素子R3,R4,R5曲R+
024についても順次それぞれの抵抗値r3rLr5・
・・・i 1024が演算される。そして、全部の抵抗
値r l −r 1024のデータ(演算値または測定
値)が揃うと、平均抵抗値割出回路24は(rl+r2
+・・・・・・・・+r 1024) / 1024を
計算して平均値r■を割り出し、そのデータDr園を印
加電圧制御回路12に与える。印加電圧制御回路12は
発熱抵抗素子R1−R1024の平均抵抗値r■に応じ
て抵抗発熱用の印加電圧を調整する。すなわち、平均抵
抗値r■が標準値よりも大きいときは印加電圧を低クシ
、平均抵抗値r■が標準値よりも小さいときは印加電圧
を高くして、印加電力(発熱エネルギ)が標準値になる
ような調整を行う。
In this way, heating resistance elements R3, R4, R5 songs R+
For 024, the respective resistance values r3rLr5・
...i 1024 is calculated. Then, when the data (calculated values or measured values) of all the resistance values r l -r 1024 are collected, the average resistance value determining circuit 24 calculates (rl+r2
+...+r1024)/1024 is calculated to determine the average value r, and the data Dr is given to the applied voltage control circuit 12. The applied voltage control circuit 12 adjusts the applied voltage for resistance heating according to the average resistance value r■ of the heating resistance elements R1 to R1024. In other words, when the average resistance value r■ is larger than the standard value, the applied voltage is lowered, and when the average resistance value r■ is smaller than the standard value, the applied voltage is increased, so that the applied power (heating energy) is the standard value. Make adjustments so that

上記のような平均抵抗値の測定および電圧調整が終了す
ると、平均抵抗値割出回路24はモード切替出力端子M
Cより論理値“L”のモード切替信号SMCを出力する
。これにより、トランジスタ16はオフとなり、発熱抵
抗素子R1〜R1024とダミー抵抗20は遮断される
。一方、トランジスタ14がオンになり、発熱抵抗素子
R1−R1024の共通接続点Nは実質的にアースに接
続された状態となる。このような状態の下で、印加電圧
制御回路12の各電圧出力端子P1.P2.・・・・P
 1024より本来の抵抗発熱用すなわち画像記録用の
電圧パルスが選択的に出力され、発熱抵抗素子の通電電
流はトランジスタ14を通ってアースに流れる。各電圧
パルスの印加電圧は上述の電圧調整によって制御されて
いるので、所期の発熱エネルギが発熱抵抗素子からイン
クフィルムに与えられ、画像情報に応じた所期の1度の
画素が用紙上に記録される。
When the average resistance value measurement and voltage adjustment as described above are completed, the average resistance value determining circuit 24 connects the mode switching output terminal M
A mode switching signal SMC with a logical value of "L" is output from C. As a result, the transistor 16 is turned off, and the heat generating resistance elements R1 to R1024 and the dummy resistor 20 are cut off. On the other hand, the transistor 14 is turned on, and the common connection point N of the heating resistance elements R1 to R1024 is substantially connected to the ground. Under such conditions, each voltage output terminal P1 . P2. ...P
1024 selectively outputs a voltage pulse intended for resistance heating, that is, for image recording, and the current flowing through the heating resistance element flows through the transistor 14 to ground. Since the applied voltage of each voltage pulse is controlled by the above-mentioned voltage adjustment, the desired heat generation energy is applied from the heating resistor element to the ink film, and the desired one pixel according to the image information is recorded on the paper. be done.

このように、この実施例では、サーマルプリントヘッド
10の発熱抵抗素子R1−R1024の平均抵抗値にバ
ラツキ(誤差)があっても、それを補償するように印加
電圧が自動的に調整されるので従来のように組立てライ
ンで作業者が面倒な手動調整を行う手間が不要である。
In this way, in this embodiment, even if there is variation (error) in the average resistance value of the heating resistive elements R1 to R1024 of the thermal print head 10, the applied voltage is automatically adjusted to compensate for it. There is no need for workers to make cumbersome manual adjustments on the assembly line as in the past.

また、電源の投入の度に電圧調整を行うので、発熱抵抗
素子R1〜R1024の抵抗値が経時変化等で変化して
も、安定した記録品質を確保することができる。
Further, since the voltage is adjusted every time the power is turned on, stable recording quality can be ensured even if the resistance values of the heating resistive elements R1 to R1024 change due to changes over time or the like.

なお、上述の例では平均抵抗値r■を求めるのに全部の
発熱抵抗素子R1〜R1024の抵抗値rl〜r102
4を測定したが、例えばR1,R5,R9,R13・・
・・というように4つ置きにサンプリングしてそれらの
抵抗値r L r 5+ r L r 13− を測定
し、それらの平均抵抗値で全体の平均抵抗値の代用とす
ることも可能である。
In addition, in the above example, in order to obtain the average resistance value r■, the resistance values rl to r102 of all the heating resistance elements R1 to R1024 are used.
For example, R1, R5, R9, R13...
It is also possible to sample every fourth resistor, measure their resistance values r L r 5+ r L r 13- , and use those average resistance values as a substitute for the overall average resistance value.

(発明の効果) 以上のように、本発明によれば、ダミー抵抗を発熱抵抗
素子の共通接続点に接続させた状態において、全部また
は一部の発熱抵抗素子の各々に順次所定の電圧を印加し
てダミー抵抗の端子より逐次検出される電圧に基づいて
発熱抵抗素子の平均抵抗値を割り出し、そり平均抵抗値
を基に抵抗発熱用(画像記録用)の印加電圧を調整する
ようにしたので、作業者が面倒な手動調整を行う手間は
不要となり、しかもより確実で精度の高い調整が可能と
なる。
(Effects of the Invention) As described above, according to the present invention, a predetermined voltage is sequentially applied to each of all or some of the heating resistance elements in a state where the dummy resistor is connected to the common connection point of the heating resistance elements. The average resistance value of the heating resistor element is calculated based on the voltage sequentially detected from the terminal of the dummy resistor, and the applied voltage for resistive heating (for image recording) is adjusted based on the warped average resistance value. This eliminates the need for the operator to perform troublesome manual adjustments, and allows for more reliable and highly accurate adjustments.

【図面の簡単な説明】[Brief explanation of the drawing]

図は、本発明の一実施例による印加電圧調整装置の構成
を示すブロック図である。 図面において、 10・・・・サーマルプリントヘッド、 R1〜R+0
24・・・・発熱抵抗素子、 N・・・・発熱抵抗素子
の接続点、12・・・・印加電圧制御回路、  14・
・・・トランジスタ、16・・・・トランジスタ、  
18・・・・反転回路、20・・・・ダミー抵抗、 2
2・・・・A/D変換器、24・・・・平均抵抗値割出
回路。
FIG. 1 is a block diagram showing the configuration of an applied voltage adjusting device according to an embodiment of the present invention. In the drawings: 10...Thermal print head, R1 to R+0
24... Heat generating resistor element, N... Connection point of the heat generating resistor element, 12... Applied voltage control circuit, 14.
...Transistor, 16...Transistor,
18... Inverting circuit, 20... Dummy resistor, 2
2... A/D converter, 24... Average resistance value determining circuit.

Claims (1)

【特許請求の範囲】 サーマルプリントヘッドの基板上に配置され電気的に並
列接続された複数の発熱抵抗素子に対する抵抗発熱用の
印加電圧を調整する印加電圧調整装置において、 前記複数の発熱抵抗素子の平均抵抗値を割り出すためダ
ミー抵抗を前記複数の発熱抵抗素子の共通接続点に接続
するダミー抵抗接続手段と、前記ダミー抵抗が接続され
た状態で全部または一部の前記発熱抵抗素子の各々に順
次所定の電圧を印加する手段と、 前記ダミー抵抗の端子より逐次検出される電圧に基づい
て前記平均抵抗値を演算する平均抵抗値割出手段と、 前記平均抵抗値の演算値を基に前記抵抗発熱用の印加電
圧を制御する電圧制御手段と、 を具備することを特徴とするサーマルプリントヘッドの
印加電圧調整装置。
[Scope of Claims] An applied voltage adjustment device that adjusts the applied voltage for resistive heating to a plurality of heating resistance elements disposed on a substrate of a thermal print head and electrically connected in parallel, comprising: dummy resistance connecting means for connecting a dummy resistor to a common connection point of the plurality of heat generating resistor elements in order to determine an average resistance value; means for applying a predetermined voltage; average resistance value determining means for calculating the average resistance value based on voltages sequentially detected from terminals of the dummy resistor; An applied voltage adjustment device for a thermal print head, comprising: voltage control means for controlling applied voltage for heat generation;
JP28791887A 1987-11-13 1987-11-13 Applied voltage adjustor for thermal printing head Pending JPH01128851A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28791887A JPH01128851A (en) 1987-11-13 1987-11-13 Applied voltage adjustor for thermal printing head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28791887A JPH01128851A (en) 1987-11-13 1987-11-13 Applied voltage adjustor for thermal printing head

Publications (1)

Publication Number Publication Date
JPH01128851A true JPH01128851A (en) 1989-05-22

Family

ID=17723415

Family Applications (1)

Application Number Title Priority Date Filing Date
JP28791887A Pending JPH01128851A (en) 1987-11-13 1987-11-13 Applied voltage adjustor for thermal printing head

Country Status (1)

Country Link
JP (1) JPH01128851A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05238038A (en) * 1992-02-28 1993-09-17 Nec Corp Control system of resistance measurement of thermal head

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60147357A (en) * 1984-01-12 1985-08-03 Fuji Xerox Co Ltd Detection of resistance value of thermal head heat generator
JPS60174665A (en) * 1984-02-20 1985-09-07 Matsushita Electric Ind Co Ltd Thermal printer
JPS61164858A (en) * 1985-01-18 1986-07-25 Nec Corp Printing density control circuit of thermal printer
JPS62222858A (en) * 1986-03-26 1987-09-30 Tokyo Electric Co Ltd Apparatus for setting voltage of thermal head

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60147357A (en) * 1984-01-12 1985-08-03 Fuji Xerox Co Ltd Detection of resistance value of thermal head heat generator
JPS60174665A (en) * 1984-02-20 1985-09-07 Matsushita Electric Ind Co Ltd Thermal printer
JPS61164858A (en) * 1985-01-18 1986-07-25 Nec Corp Printing density control circuit of thermal printer
JPS62222858A (en) * 1986-03-26 1987-09-30 Tokyo Electric Co Ltd Apparatus for setting voltage of thermal head

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05238038A (en) * 1992-02-28 1993-09-17 Nec Corp Control system of resistance measurement of thermal head

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