JPS63116870A - Method for trimming heat generating resistor of thermal head - Google Patents
Method for trimming heat generating resistor of thermal headInfo
- Publication number
- JPS63116870A JPS63116870A JP61263425A JP26342586A JPS63116870A JP S63116870 A JPS63116870 A JP S63116870A JP 61263425 A JP61263425 A JP 61263425A JP 26342586 A JP26342586 A JP 26342586A JP S63116870 A JPS63116870 A JP S63116870A
- Authority
- JP
- Japan
- Prior art keywords
- heat generating
- resistance value
- resistor
- heating resistor
- voltage
- 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
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000009966 trimming Methods 0.000 title claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims description 51
- 230000020169 heat generation Effects 0.000 claims 1
- 238000012937 correction Methods 0.000 abstract description 9
- 239000000523 sample Substances 0.000 abstract description 5
- 238000007639 printing Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910001925 ruthenium oxide Inorganic materials 0.000 description 2
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
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
- B41J2/35—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 providing current or voltage to the thermal head
- B41J2/355—Control circuits for heating-element selection
Landscapes
- Apparatuses And Processes For Manufacturing Resistors (AREA)
- Electronic Switches (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、熱転写式プリンタや、ファクシミリに使用さ
れるサーマルヘッドの発熱抵抗体トリミング方法に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for trimming a heating resistor of a thermal head used in a thermal transfer printer or facsimile.
従来の技術
従来、熱転写式プリンタや、ファクシミリに使用される
サーマルヘッドの構造は第３図ａ、ｂに示すように、絶
縁基板１の上に金、銀、銅、等の電気良導体材料を用い
て、成膜技術によシ構成された共通電極２と、個別電極
３が形成され、その上に抵抗体層４と耐摩耗層６が構成
される。その結果、共通電極２と個別電極３に挾まれた
複数個の発熱抵抗体６が形成される。BACKGROUND OF THE INVENTION Conventionally, the structure of a thermal head used in a thermal transfer printer or a facsimile machine is as shown in FIGS. A common electrode 2 and individual electrodes 3 are formed using a film forming technique, and a resistor layer 4 and a wear-resistant layer 6 are formed thereon. As a result, a plurality of heating resistors 6 sandwiched between the common electrode 2 and the individual electrodes 3 are formed.
このようなサーマルヘッドの発熱抵抗体は、酸化ルテニ
ウム等の粉末をペースト状にして、スクリーン印刷技術
等を用いて、塗布した後、焼成することにより、形成す
るのが、一般的であり、製造コストや信頼性の点からも
、このような方法が主流となりつつある。The heating resistor of such a thermal head is generally formed by making a paste of powder such as ruthenium oxide, applying it using screen printing technology, etc., and then baking it. This method is becoming mainstream in terms of cost and reliability.
しかしながら、印刷によって発熱抵抗体を形成すること
は、発熱抵抗体を構成している酸化ルテニウム等の粉末
の不均一性や、印刷機械の精度の限界から、形成された
複数個の発熱抵抗体間々の物性や形状が不均一となり、
これらが、発熱抵抗体の抵抗値にバラツキが生じる原因
となって、ヘッド全体の発熱抵抗体の抵抗値のバラツキ
は、平均抵抗値の±２０％以上あるのが現状である。However, forming heating resistors by printing is difficult due to the non-uniformity of the powder such as ruthenium oxide that makes up the heating resistors and the limited accuracy of printing machines. The physical properties and shape of the
These factors cause variations in the resistance value of the heat generating resistor, and currently the variation in the resistance value of the heat generating resistor throughout the head is ±20% or more of the average resistance value.
そこで、印刷によって生じた発熱抵抗体の抵抗値のバラ
ツキを補正する方法（トリミング方法）が種々考えられ
ている。例えばレーザー加工等により、抵抗体の形状を
変化させて抵抗値を補正する方法や、発熱抵抗体に通常
の使用時より過負荷のパルス電圧を印加して抵抗値を変
化させる方法がある。Therefore, various methods (trimming methods) have been considered for correcting variations in the resistance value of the heating resistor caused by printing. For example, there is a method of correcting the resistance value by changing the shape of the resistor using laser processing or the like, or a method of changing the resistance value by applying an overload pulse voltage to the heat generating resistor compared to when it is normally used.
発明が解決しようとする問題点
しかし、このような従来のトリミング方法では、前者は
発熱抵抗体の形状が変わるだめに印字性能に悪影響を及
ぼすため、サーマルヘッドの発熱抵抗体のトリミング方
法としては好ましくなく、後者の方法は、その点では優
れているが、発熱抵抗体の抵抗値が所定値に達するまで
パルス電圧の印加と、抵抗値の測定を交互に繰り返して
行う必要があり、抵抗値の補正に要する時間が長くなる
という欠点を有していた。Problems to be Solved by the Invention However, with such conventional trimming methods, the former has a negative effect on printing performance because the shape of the heating resistor changes, so this method is preferable as a method for trimming the heating resistor of a thermal head. The latter method is superior in that respect, but it requires repeating the application of pulse voltage and measuring the resistance value alternately until the resistance value of the heating resistor reaches a predetermined value. This has the disadvantage that it takes a long time for correction.
そこで、本発明は印字性能に悪影響を及ぼすことなく、
しかも、短時間で精度よく発熱抵抗体の抵抗値を所定値
に補正できるサーマルヘッドの発熱抵抗体トリミング方
法を提供するものである。Therefore, the present invention has no adverse effect on printing performance.
Furthermore, the present invention provides a heating resistor trimming method for a thermal head that can accurately correct the resistance value of the heating resistor to a predetermined value in a short time.
問題点を解決するための手段
上記問題点を解決するための本発明の技術的手段は、サ
ーマルヘッドの発熱抵抗と直列に、抵抗値が既知の基準
抵抗を接続し、電圧パルス印加時の基準抵抗間の電圧を
測定し、発熱抵抗体が流れる電流値を算出し、同時に、
発熱抵抗体間の電圧を測定することにより、発熱抵抗体
の抵抗値を算出すると共に、上記発熱抵抗体の抵抗値が
所定値に達する迄、電圧パルスの印加を続けることによ
シ、発熱抵抗体の抵抗値を所定値に補正するものである
。Means for Solving the Problems The technical means of the present invention for solving the above problems is to connect a reference resistor with a known resistance value in series with the heating resistor of the thermal head, so that the reference resistance when applying a voltage pulse is connected in series with the heating resistor of the thermal head. Measure the voltage between the resistors, calculate the current value flowing through the heating resistor, and at the same time,
By measuring the voltage across the heating resistor, the resistance value of the heating resistor is calculated, and by continuing to apply voltage pulses until the resistance value of the heating resistor reaches a predetermined value, the heating resistor is This is to correct the resistance value of the body to a predetermined value.
作 用
本発明は上記した方法により、過負荷のパルス電圧を印
加することによるサーマルヘッドの発熱抵抗体の抵抗値
の変化特性を利用して、印字性能に悪影響を及ぼすこと
なく、しかも、短時間で精度よく、サーマルヘッドの発
熱抵抗体の抵抗値を所定値に補正できるものである。Effect The present invention uses the above-described method to utilize the characteristic of change in resistance value of the heating resistor of the thermal head due to the application of an overload pulse voltage, without adversely affecting printing performance, and in a short period of time. The resistance value of the heating resistor of the thermal head can be corrected to a predetermined value with high accuracy.
実施例
以下、本発明の一実施例を添付図面に基づいて説明する
。なお従来例を示す第３図と共通の素子には共通の番号
を付している。EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings. Note that elements common to those in FIG. 3 showing the conventional example are given common numbers.
第１図は本発明のサーマルヘッドの発熱抵抗体トリミン
グ方法を用いた装置の構成図であり、絶縁基板１上に形
成された複数の発熱抵抗体６と直列になるように、共通
電極２に既知の抵抗値Ｒ。FIG. 1 is a block diagram of an apparatus using the heating resistor trimming method of a thermal head according to the present invention. Known resistance value R.
を持つ基準抵抗７を接続し、個別電極３は個別電極３に
接触させたプローブ８を介して、パルス電圧発生器９の
プラス側に接続されている。また、上記基準抵抗７の他
端はパルス電圧発生器９のマイナス側に接続されている
。なお、１０は発熱抵抗体６間にかかるパルス電圧を測
定する発熱抵抗体用電圧計、１１は基準抵抗７間にかか
るパルス電圧を測定する基準抵抗用電圧計である。The individual electrode 3 is connected to the positive side of a pulse voltage generator 9 via a probe 8 that is in contact with the individual electrode 3. Further, the other end of the reference resistor 7 is connected to the negative side of the pulse voltage generator 9. Note that 10 is a heating resistor voltmeter that measures the pulse voltage applied across the heating resistor 6, and 11 is a reference resistance voltmeter that measures the pulse voltage applied across the reference resistor 7.
さらに、絶縁基板１はサーマルヘッド全体が均一な温度
に保持されるように、温度調整基台１２上に設置されて
おり、発熱抵抗体らの温度も一定値に保持されている。Furthermore, the insulating substrate 1 is placed on a temperature adjustment base 12 so that the entire thermal head is maintained at a uniform temperature, and the temperature of the heating resistors is also maintained at a constant value.
第２図は本発明のトリミング方法の一実施手段を示すフ
ローチャートである。同図に基づいて本発明のトリミン
グ方法を説明する。FIG. 2 is a flowchart showing one implementation means of the trimming method of the present invention. The trimming method of the present invention will be explained based on the figure.
まず、発熱抵抗体６に印加すべきパルス電圧、パルス幅
、パルス周期等のパルス条件を決定し、パルス電圧発生
器９をセットする。次に補正を要する発熱抵抗体６の個
別電極３にプローブ８をセットし、パルス電圧の印加を
開始する。この時、発熱抵抗体用電圧計１０、および基
準抵抗用電圧計１１を用いて、発熱抵抗体６間にかかる
パルス電圧、および基準抵抗７間にかかるパルス電圧を
同時に測定する。測定された電圧をそれぞれ、Ｖｒ。First, pulse conditions such as pulse voltage, pulse width, and pulse period to be applied to the heating resistor 6 are determined, and the pulse voltage generator 9 is set. Next, the probe 8 is set on the individual electrode 3 of the heating resistor 6 that requires correction, and the application of pulse voltage is started. At this time, the pulse voltage applied across the heating resistor 6 and the pulse voltage applied across the reference resistor 7 are simultaneously measured using the heating resistor voltmeter 10 and the reference resistance voltmeter 11. The measured voltages are respectively Vr.
Ｖｏとする。この測定値に基づき次式を用いて電流値Ｉ
および発熱抵抗体６の抵抗値Ｒを算出する。Let's say Vo. Based on this measured value, the current value I is calculated using the following formula:
And the resistance value R of the heating resistor 6 is calculated.
Ｉ＝Ｖｏ／Ｒ。I=Vo/R.
Ｒ＝ Ｖ ｒ ／ Ｉ
次に、発熱抵抗体６の抵抗値が所定の値に補正されたこ
とを判定し、まだ、補正が必要な場合には続けて前述の
電圧測定および抵抗値の算出を繰り返して行い、発熱抵
抗体６の抵抗値が所定の値に補正された場合には、他の
補正を要する発熱抵抗体６の個別電極３にプローブ８を
セットしなおし、前述のトリミング作業を、補正を要す
る発熱抵抗体がなくなるまで繰り返す。R= V r / I Next, it is determined that the resistance value of the heating resistor 6 has been corrected to a predetermined value, and if correction is still required, the voltage measurement and resistance value calculation described above are continued. When the resistance value of the heat generating resistor 6 is corrected to a predetermined value by repeating the process, the probe 8 is reset to the individual electrode 3 of the heat generating resistor 6 that requires other correction, and the above-mentioned trimming operation is carried out. Repeat until there are no heating resistors that require correction.
上記説明より明らかなように、本発明のトリミング方法
を採用することにより、パルス電圧を印加しながら発熱
抵抗体６の抵抗値を算出できるため、従来のようにパル
ス電圧の印加、停止、抵抗値の測定を繰り返して行う方
法に比べて、短時間で精度よく、サーマルヘッドの発熱
抵抗体の抵抗値を所定値に補正できるものである。As is clear from the above explanation, by adopting the trimming method of the present invention, the resistance value of the heating resistor 6 can be calculated while applying a pulse voltage. Compared to a method in which measurements are repeatedly performed, the resistance value of the heating resistor of the thermal head can be corrected to a predetermined value in a short time and with high accuracy.
さらに、絶縁基板１はサーマルヘッド全体が均一な温度
に保持されるように、温度調整基台１２上に設置されて
おシ、パルス電圧印加時も発熱抵抗体６の温度が一定値
に保持されているため、温度変化による抵抗値のバラツ
キも防止できるものである。Furthermore, the insulating substrate 1 is installed on a temperature adjustment base 12 so that the entire thermal head is maintained at a uniform temperature, and the temperature of the heating resistor 6 is maintained at a constant value even when a pulse voltage is applied. Therefore, it is possible to prevent variations in resistance value due to temperature changes.
上記実施例において、基準抵抗７は共通電極２側に接続
されていたが、個別電極３側に接続しても同様のトリミ
ング方法の実施が可能なことは明らかである。In the above embodiment, the reference resistor 7 was connected to the common electrode 2 side, but it is clear that the same trimming method can be performed even if it is connected to the individual electrode 3 side.
さらに、発熱抵抗体６に印加すべきパルス電圧、パルス
幅、パルス周期等のパルス条件を、補正の途中経過を見
て、例えばパルス電圧を上げるなどの調整を行うことに
より、トリミングに要する時間を短縮出来るものである
。Furthermore, the pulse conditions such as the pulse voltage, pulse width, and pulse period to be applied to the heating resistor 6 can be adjusted to reduce the time required for trimming by, for example, increasing the pulse voltage while observing the progress of the correction. It can be shortened.
発明の効果
本発明のサーマルヘッドの発熱抵抗体トリミング方法は
、サーマルヘッドの発熱抵抗体と直列に、抵抗値が既知
の基準抵抗を接続し、電圧パルス印加時の基準抵抗間の
電圧を測定し、発熱抵抗体を流れる電流値を算出し、同
時に、発熱抵抗体間の電圧を測定することにより、パル
ス電圧を印加しながら発熱抵抗６の抵抗値を算出できる
ため、従来のようにパルス電圧の印加、停止、抵抗値の
測定を繰り返して行う方法に比べて、短時間で精度よく
、サーマルヘッドの発熱抵抗体の抵抗値を所定値に補正
できるものである。Effects of the Invention The heating resistor trimming method for a thermal head of the present invention connects a reference resistor with a known resistance value in series with the heating resistor of a thermal head, and measures the voltage between the reference resistors when a voltage pulse is applied. By calculating the current value flowing through the heating resistor and at the same time measuring the voltage between the heating resistors, the resistance value of the heating resistor 6 can be calculated while applying a pulse voltage. Compared to the method of repeatedly applying, stopping, and measuring the resistance value, the resistance value of the heating resistor of the thermal head can be corrected to a predetermined value in a short time and with high accuracy.
さらに、温度調整基台を用いることによシ、パルス電圧
印加時も発熱抵抗体の温度が一定値に保持されているた
め、温度変化による抵抗値のバラツキも防止できるなど
、実用上、多大な効果を発揮するものである。Furthermore, by using a temperature adjustment base, the temperature of the heating resistor is maintained at a constant value even when a pulse voltage is applied, so it is possible to prevent variations in resistance value due to temperature changes. It is effective.
第１図は本発明の一実施例のサーマルヘッドの発熱抵抗
体トリミング方法を用いた装置の構成図、第２図は本発
明のトリミング方法の一実施例を示すフローチャート、
第３図は従来例のサーマルヘッドの構造図である。
１・・・・・・絶縁基板、２・・・・・・共通電極、３
・・・・・・個別電極、４・・・・・・抵抗体層、６・
・・・・・発熱抵抗体、７・・・・・・基準抵抗、９・
・・・・・パルス電圧発生器、１ｏ・・・・・・発熱抵
抗体用電圧計、１１・・・・・・基準抵抗用電圧計。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
第２図
／−一一絶県坂
？−大通−電極
３−−−イ厘別 質Ｌλ角にFIG. 1 is a configuration diagram of an apparatus using a heating resistor trimming method for a thermal head according to an embodiment of the present invention, and FIG. 2 is a flowchart showing an embodiment of the trimming method of the present invention.
FIG. 3 is a structural diagram of a conventional thermal head. 1...Insulating substrate, 2...Common electrode, 3
...Individual electrode, 4...Resistor layer, 6.
...Heating resistor, 7...Reference resistance, 9.
...Pulse voltage generator, 1o... Voltmeter for heating resistor, 11... Voltmeter for reference resistance. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2/-Ichikzetsukenzaka? -Odori-Electrode 3--I according to the material Lλ angle
Claims (2)
既知の基準抵抗を接続し、電圧パルス印加時の基準抵抗
間の電圧を測定し、発熱抵抗体を流れる電流値を算出し
、同時に、発熱抵抗体間の電圧を測定することにより、
発熱抵抗体の抵抗値を算出すると共に、上記発熱抵抗体
の抵抗値が所定値に達する迄、電圧パルスの印加を続け
ることにより、発熱抵抗体の抵抗値を所定値に設定する
サーマルヘッドの発熱抵抗体トリミング方法。(1) Connect a reference resistor with a known resistance value in series with the heat generating resistor of the thermal head, measure the voltage between the reference resistors when a voltage pulse is applied, calculate the current value flowing through the heat generating resistor, and at the same time , by measuring the voltage across the heating resistor,
Thermal head heat generation by calculating the resistance value of the heating resistor and setting the resistance value of the heating resistor to a predetermined value by continuing to apply voltage pulses until the resistance value of the heating resistor reaches a predetermined value. Resistor trimming method.
保持してなる特許請求の範囲第１項記載のサーマルヘッ
ドの発熱抵抗体トリミング方法。(2) A method for trimming a heating resistor of a thermal head according to claim 1, wherein the temperature of the heating resistor of the thermal head is maintained at a constant value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61263425A JPS63116870A (en) | 1986-11-05 | 1986-11-05 | Method for trimming heat generating resistor of thermal head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61263425A JPS63116870A (en) | 1986-11-05 | 1986-11-05 | Method for trimming heat generating resistor of thermal head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63116870A true JPS63116870A (en) | 1988-05-21 |
Family
ID=17389314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61263425A Pending JPS63116870A (en) | 1986-11-05 | 1986-11-05 | Method for trimming heat generating resistor of thermal head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63116870A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007178039A (en) * | 2005-12-27 | 2007-07-12 | Sharp Corp | Ice making vessel |
-
1986
- 1986-11-05 JP JP61263425A patent/JPS63116870A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007178039A (en) * | 2005-12-27 | 2007-07-12 | Sharp Corp | Ice making vessel |
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