JPH0712695B2 - Thermal head trimming method for heating resistor - Google Patents
Thermal head trimming method for heating resistorInfo
- Publication number
- JPH0712695B2 JPH0712695B2 JP62010530A JP1053087A JPH0712695B2 JP H0712695 B2 JPH0712695 B2 JP H0712695B2 JP 62010530 A JP62010530 A JP 62010530A JP 1053087 A JP1053087 A JP 1053087A JP H0712695 B2 JPH0712695 B2 JP H0712695B2
- Authority
- JP
- Japan
- Prior art keywords
- heating resistor
- resistance value
- thermal head
- pulse
- pulse width
- 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.)
- Expired - Lifetime
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
- B41J2/35—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
Landscapes
- Electronic Switches (AREA)
- Apparatuses And Processes For Manufacturing Resistors (AREA)
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。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating resistor trimming method for a thermal head used in a thermal transfer printer or a 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、成膜技術により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５
が構成される。その結果、共通電極２と個別電極３に挟
まれた複数個の発熱抵抗体６が形成される。2. Description of the Related Art Conventionally, the structure of a thermal head used in a thermal transfer printer or a facsimile is as shown in FIGS. The material is used to form a common electrode 2 and an individual electrode 3 which are formed by a film forming technique, on which a resistor layer 4 and an abrasion resistant layer 5 are formed.
Is configured. As a result, a plurality of heating resistors 6 sandwiched between the common electrode 2 and the individual electrode 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 forming powder of ruthenium oxide or the like into a paste, applying the paste using screen printing technology, etc., and then firing it. Such a 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各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 the heat generating resistor by printing means that each of the plurality of heat generating resistors is formed due to the non-uniformity of the powder such as ruthenium oxide forming the heat generating resistor and the limit of the accuracy of the printing machine. The physical properties and shape of the
These cause the resistance value of the heating resistor to fluctuate, and the fluctuation of the resistance value of the heating resistor of the entire head is currently ± 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) for correcting the variation in the resistance value of the heating resistor caused by printing have been considered. For example, there is a method of changing the shape of the resistor by laser processing or the like to correct the resistance value, or a method of applying a pulse voltage to the heating resistor that is more overloaded than in normal use to change the resistance value.
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た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、発熱抵抗体に過負荷のパルス電圧を印加す
るため、発熱抵抗体の寿命に悪影響を与えるという欠点
を有していた。However, in the conventional trimming method as described above, the former is preferable as the trimming method of the heating resistor of the thermal head because the former has a different shape and thus adversely affects the printing performance. However, the latter method is excellent in that respect, but has a drawback that the life of the heating resistor is adversely affected because an overload pulse voltage is applied to the heating resistor.
そこで、本発明は印字性能や発熱抵抗体に悪影響及ぼす
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 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 without adversely affecting the printing performance and the heating resistor. .
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、所
定のバラツキ範囲を越える抵抗値を有するサーマルヘッ
ドの発熱抵抗体に、負荷が小さく、かつパルス幅の小さ
な電圧パルスを印加した後、前記発熱抵抗体の抵抗値を
測定し、抵抗値が所定のバラツキ範囲に達した発熱抵抗
体には以後の電圧パルスの印加を停止し、なお所定のバ
ラツキ範囲に達しない発熱抵抗体には、負荷が小さく、
かつよりパルス幅の大きな電圧パルスを印加し、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 apply a small load and a small pulse width to a heating resistor of a thermal head having a resistance value exceeding a predetermined variation range. After applying a small voltage pulse, the resistance value of the heating resistor is measured, and the application of the subsequent voltage pulse is stopped for the heating resistor whose resistance value has reached the predetermined variation range, and the heating resistor is still within the predetermined variation range. The heating resistor that does not reach the load has a small load,
In addition, a voltage pulse having a larger pulse width is applied to correct the resistance value of the heating resistor to a predetermined value.
作用 本発明は上記した方法により、パルス幅の小さな電圧パ
ルスを印加した場合には同一の電圧でも抵抗値の低下が
小さく、また、パルス幅の大きな電圧パルスを印加した
場合には同一の電圧でも抵抗値の低下が大きくなる変化
特性を利用して抵抗値を補正することにより、より低い
パルス電圧で抵抗値を補正することができるので、過負
荷の電圧をかけることなく、したがって印字性能や発熱
抵抗体の寿命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 method described above to reduce the decrease in resistance value even when the same voltage is applied when a voltage pulse having a small pulse width is applied, and the same voltage is applied when a voltage pulse having a large pulse width is applied. The resistance value can be corrected with a lower pulse voltage by correcting the resistance value by using the change characteristic that the decrease of the resistance value becomes large. Therefore, the printing performance and the heat generation can be prevented without applying the overload voltage. It is possible to accurately correct the resistance value of the heating resistor of the thermal head to a predetermined value in a short time without adversely affecting the life of the resistor.
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。Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings. It should be noted that elements common to those of 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は、共通電極２と、個別電
極３に接触させたプローブ装置７および切換スイッチ装
置８を介して、抵抗測定器９およびパルス幅可変パルス
電圧発生装置10に接続されている。FIG. 1 is a block diagram of an apparatus using a method for trimming a heating resistor of a thermal head according to the present invention. A plurality of heating resistors 6 formed on an insulating substrate 1 are provided in a common electrode 2 and an individual electrode 3. It is connected to the resistance measuring device 9 and the pulse width variable pulse voltage generator 10 via the probe device 7 and the changeover switch device 8 which are brought into contact with each other.
第２図は発熱抵抗体にパルス幅の異なるパルス電圧を印
加した場合の抵抗値の変化特性を示した一例である。こ
の図より、一定のパルス幅のパルス電圧を発熱抵抗体に
印加する場合、パルス電圧の増大と共に発熱抵抗体の抵
抗値は徐々に低下し、最低抵抗値に達した後、さらにパ
ルス電圧を増大させると、抵抗値は急激に上昇する傾向
を示すことが判る。また、この抵抗値の変化はパルス幅
が大きくなるほど急激であり、例えば、パルス電圧を一
定値Vtに保ち、パルス幅を徐々に大きくしていくと、発
熱抵抗体の抵抗値は、同図に示したようにR1,R2,R3と徐
々に低下する傾向を示す。FIG. 2 is an example showing resistance value change characteristics when pulse voltages having different pulse widths are applied to the heating resistor. From this figure, when a pulse voltage with a constant pulse width is applied to the heating resistor, the resistance value of the heating resistor gradually decreases as the pulse voltage increases, and after reaching the minimum resistance value, the pulse voltage further increases. It can be seen that the resistance value shows a tendency to rise sharply. Further, the change in the resistance value becomes steeper as the pulse width increases, and for example, when the pulse voltage is kept at a constant value Vt and the pulse width is gradually increased, the resistance value of the heating resistor is shown in the same figure. As shown, it tends to gradually decrease with R1, R2, and R3.
本発明は、パルス電圧が一定でもパルス幅が変わると、
発熱抵抗体抵抗値が変化するという抵抗値変化特性を利
用して、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であり、以下、ト
リミングの手順を説明する。The present invention, when the pulse width changes even if the pulse voltage is constant,
This is a heating resistor trimming method for a thermal head that sets the resistance value of the heating resistor to a predetermined value by utilizing the resistance value changing characteristic that the resistance value of the heating resistor changes, and the trimming procedure will be described below.
まず、プローブ装置７を発熱抵抗体６の個別電極３およ
び共通電極２にセットした後、切換スイッチ装置８を操
作して各発熱抵抗体６の抵抗値を抵抗測定器９により、
測定し、所定のバラツキ範囲を越える抵抗値を示す発熱
抵抗体６は切換スイッチ装置８の操作により、パルス幅
可変パルス電圧発生装置10に接続する。このパルス幅可
変パルス電圧発生装置10は、予め発熱抵抗体６の抵抗値
変化特性を考慮して、印加すべきパルス電圧Vt、およ
び、パルス周期Ｔを決定しセットしておき、最初は、数
マイクロ秒程度の小さなパルス幅ｔのパルス電圧を発生
させて、スイッチ装置８およびプローブ装置７を介して
発熱抵抗体６に、所定のパルス数だけパルス電圧を印加
する。これにより、パルス電圧を印加された発熱抵抗体
６の抵抗値は低下する。その後、再び、切換スイッチ装
置８を操作して各発熱抵抗体６の抵抗値を抵抗測定器９
により、測定し、なお、抵抗値が所定のバラツキ範囲に
達していない発熱抵抗体６は、再び切換スイッチ装置８
の操作により、パルス幅可変パルス電圧発生装置10に接
続する。そして、前回より大きいパルス幅ｔ′（例えば
十数マイクロ秒）のパルス電圧を発生させて、再び切換
スイッチ装置８およびプローブ装置７を介して発熱抵抗
体６に、所定のパルス数だけパルス電圧を印加し、さら
に抵抗値を低下させた後、抵抗値のバラツキのチェック
を行う。この操作を全発熱抵抗体６が所定のバラツキ範
囲に達するまで繰り返すことにより、サーマルヘッドの
発熱抵抗体のトリミングを行うことができる。First, after setting the probe device 7 on the individual electrode 3 and the common electrode 2 of the heating resistor 6, the changeover switch device 8 is operated to measure the resistance value of each heating resistor 6 by the resistance measuring device 9.
The heating resistor 6, which is measured and exhibits a resistance value exceeding a predetermined variation range, is connected to the pulse width variable pulse voltage generator 10 by operating the changeover switch device 8. In this pulse width variable pulse voltage generator 10, the pulse voltage Vt to be applied and the pulse period T are determined and set in advance in consideration of the resistance value changing characteristics of the heating resistor 6, and at first, several A pulse voltage having a small pulse width t of about microseconds is generated, and a pulse voltage of a predetermined number of pulses is applied to the heating resistor 6 via the switch device 8 and the probe device 7. As a result, the resistance value of the heating resistor 6 to which the pulse voltage is applied decreases. After that, the changeover switch device 8 is operated again to change the resistance value of each heating resistor 6 to the resistance measuring device 9
Therefore, the heating resistor 6 whose resistance value has not reached the predetermined variation range is measured again by the changeover switch device 8
The pulse width variable pulse voltage generator 10 is connected by the operation of. Then, a pulse voltage having a pulse width t '(for example, ten and a few microseconds) larger than the previous time is generated, and a pulse voltage of a predetermined number of pulses is again applied to the heating resistor 6 via the changeover switch device 8 and the probe device 7. After applying the voltage and further lowering the resistance value, the variation of the resistance value is checked. By repeating this operation until all the heating resistors 6 reach the predetermined variation range, the heating resistors of the thermal head can be trimmed.
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、パルス電圧が一定でもパルス幅が変わると、発熱抵
抗体の抵抗値が変化するという抵抗値変化特性を利用し
て、発熱抵抗体の抵抗値を所定値に設定するものである
から、従来のように発熱抵抗体に過負荷のパルス電圧を
印加し、発熱抵抗体の寿命に悪影響を与えることもな
く、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など、実用上、多大な効果
を発揮するものである。The heating resistor trimming method for the thermal head according to the present invention utilizes the resistance change characteristic that the resistance value of the heating resistor changes when the pulse width changes even if the pulse voltage is constant. Since the resistance value is set to a predetermined value, the overload pulse voltage is applied to the heating resistor as in the past, and the life of the heating resistor is not adversely affected, and the thermal This has a great effect in practical use such that the resistance value of the heating resistor of the head can be corrected to a predetermined value.
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図は同方
法の原理を示す発熱抵抗体の抵抗値変化特性図、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……プローブ装
置、８……切換スイッチ装置、９……抵抗測定器、10…
…パルス幅可変パルス電圧発生器。FIG. 1 is a block diagram of an apparatus using a method for trimming a heating resistor of a thermal head according to an embodiment of the present invention, FIG. 2 is a resistance value change characteristic diagram of a heating resistor showing the principle of the method, and FIG. FIG. 4 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 ...... Probe device, 8 ...... Changeover switch device, 9 ...... Resistance measuring device, 10 ・ ・ ・
… Pulse width variable pulse voltage generator.
フロントページの続き (56)参考文献 特開 昭62−283602（ＪＰ，Ａ) 特開 昭61−154006（ＪＰ，Ａ) 特開 昭62−283602（ＪＰ，Ａ)Continuation of the front page (56) References JP 62-283602 (JP, A) JP 61-154006 (JP, A) JP 62-283602 (JP, A)
Claims (1)
るサーマルヘッドの発熱抵抗体に、負荷が小さく、かつ
パルス幅の小さな電圧パルスを印加した後、前記前記発
熱抵抗体の抵抗値を測定し、抵抗値が所定のバラツキ範
囲に達した発熱抵抗体には以後の電圧パルスの印加を停
止し、なお所定のバラツキ範囲内に達しない発熱抵抗体
には、負荷が小さく、かつ、よりパルス幅の大きな電圧
パルスを印加し、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. A resistance value of the heating resistor is measured after applying a voltage pulse having a small load and a small pulse width to a heating resistor of a thermal head having a resistance value exceeding a predetermined variation range. , The subsequent application of voltage pulse is stopped to the heating resistor whose resistance value has reached the specified variation range, and the heating resistor whose resistance value has not reached the specified variation range has a smaller load and more pulse width. A heating resistor trimming method for a thermal head, in which a large voltage pulse is applied to set the resistance value of the heating resistor to a predetermined value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62010530A JPH0712695B2 (en) | 1987-01-20 | 1987-01-20 | Thermal head trimming method for heating resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62010530A JPH0712695B2 (en) | 1987-01-20 | 1987-01-20 | Thermal head trimming method for heating resistor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63178060A JPS63178060A (en) | 1988-07-22 |
| JPH0712695B2 true JPH0712695B2 (en) | 1995-02-15 |
Family
ID=11752808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62010530A Expired - Lifetime JPH0712695B2 (en) | 1987-01-20 | 1987-01-20 | Thermal head trimming method for heating resistor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0712695B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2728497B2 (en) * | 1989-04-28 | 1998-03-18 | 株式会社日立製作所 | Trimming device for thermal head |
| JP5310452B2 (en) * | 2009-09-30 | 2013-10-09 | オムロン株式会社 | Laser processing apparatus and laser processing method |
-
1987
- 1987-01-20 JP JP62010530A patent/JPH0712695B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63178060A (en) | 1988-07-22 |
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