JPS60199672A - Thermal head and manufacture thereof - Google Patents
Thermal head and manufacture thereofInfo
- Publication number
- JPS60199672A JPS60199672A JP59055731A JP5573184A JPS60199672A JP S60199672 A JPS60199672 A JP S60199672A JP 59055731 A JP59055731 A JP 59055731A JP 5573184 A JP5573184 A JP 5573184A JP S60199672 A JPS60199672 A JP S60199672A
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- heating element
- sheet resistance
- thermal head
- distribution
- 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
- B41J2/345—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 characterised by the arrangement of resistors or conductors
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、サーマルヘッド及びその製造方法に係わり、
特に屈曲部を有する抵抗体より成る発熱体を具備するサ
ーマルヘッド、及びその製造方法に関する。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a thermal head and a method for manufacturing the same.
In particular, the present invention relates to a thermal head equipped with a heating element made of a resistor having a bent portion, and a method for manufacturing the same.
従来、第４図に示さしるような屈曲部４２を有する抵抗
体より成る発熱体４１を具備したサーマルヘッドにおい
て、上記抵抗体は、上記発熱体４１の各部にわたり均一
なシート抵抗を有していた。従って、上記発熱体４１を
電力駆動させたときの、該発熱体４１内の電流密層は、
第５図に示されるように、屈曲部の内側部分５２で最も
高くなり、即ち、発熱体内の温度分布は、該屈曲の内側
部分５２が最高温部となる。第５図において５４は、電
気力線を表わす。上記温間分布は、発熱体の寿命におい
て、重要な係わりを有し、上記屈曲の内ｆ１１部分５２
の温度が高くなることは、該屈曲の内側部分５２の抵抗
体劣化が最も激しいことに通じる。即ち、従来のサーマ
ルヘッドにおいては、発熱体の局所的劣化が起こりやす
く、寿命の短いものであった。Conventionally, in a thermal head equipped with a heating element 41 made of a resistor having a bent portion 42 as shown in FIG. 4, the resistor has a uniform sheet resistance over each part of the heating element 41. Ta. Therefore, when the heating element 41 is driven by electric power, the current dense layer inside the heating element 41 is as follows:
As shown in FIG. 5, the temperature is highest at the inner portion 52 of the bend, that is, the temperature distribution within the heating element is the highest temperature at the inner portion 52 of the bend. In FIG. 5, 54 represents lines of electric force. The above-mentioned warm distribution has an important relationship with the life of the heating element, and the f11 portion 52 of the above-mentioned bend
The higher the temperature, the more severe the deterioration of the resistor in the inner portion 52 of the bend. That is, in conventional thermal heads, local deterioration of the heating element easily occurs, resulting in a short lifespan.
本発明は、上記従来の欠点に鑑みなさｎたもので、発熱
体を構成する屈曲部を有する抵抗体のシート抵抗分布を
適宜不均一にすることによって、上記発熱体を電力駆動
したときの電流密度の局所的集中を緩和し、もって発熱
体の長寿命化を実現することを目的とする。The present invention has been made in view of the above-mentioned conventional drawbacks, and by appropriately making the sheet resistance distribution of a resistor having a bent portion constituting a heating element non-uniform, the current when driving the heating element with electric power is increased. The purpose is to alleviate local concentration of density and thereby extend the life of the heating element.
本発明によるサーマルヘッド、及びその製造方法につい
て、一実施例を図面を用いて説明する。An embodiment of a thermal head and a method for manufacturing the same according to the present invention will be described with reference to the drawings.
第１図は、本発明によるサーマルヘッドの発熱体要部平
面図であり、１は抵抗体、２は等シート抵抗線である。FIG. 1 is a plan view of the main part of the heating element of the thermal head according to the present invention, where 1 is a resistor and 2 is an equal sheet resistance line.
第１図に示すシート抵抗の分布において、上記抵抗体１
の屈曲部の内側３が最もシート抵抗が高く、屈曲部の外
側４が最もシート抵抗が低い。上記抵抗体１を流ｎる電
流の最短径路は上記屈曲部の内側３を通る径路であるが
、該径路は最もシート抵抗の高い径路でもあり、一方、
電流の最長径路は上記屈曲部の外側４を通る径路である
が、該径路は最もシート抵抗の低い径路でちる。In the sheet resistance distribution shown in FIG.
The inner side 3 of the bent portion has the highest sheet resistance, and the outer side 4 of the bent portion has the lowest sheet resistance. The shortest path of the current flowing through the resistor 1 is the path passing through the inside 3 of the bent portion, but this path is also the path with the highest sheet resistance;
The longest path of the current is the path passing through the outside 4 of the bent portion, and this path is chosen to be the path with the lowest sheet resistance.
上述のようなシート抵抗分布を上記発熱体が有すること
により、第２図に示すような抵抗体２１の一屈曲部にお
いて、該屈曲部内側を通る電流径路２２の始点２２−１
から終点２２−２までの単位幅光たりの抵抗値Ｒ２２、
及び上記屈曲部外側を通る電流径路乙の始点２３−１か
ら終点２３−２までの単位幅光たりの抵抗値Ｒ２３につ
いて以下に述べる関係が保ｆｃｒ＋−得る。即ち、任意
の径路において、該径路の有する単位幅轟たりの抵抗値
が次式
で与えらｎることから、従来の抵抗体が均一なシート抵
抗の場合に較べ、径路抵抗値の比Ｒ２３／ Ｒ２２は、
本発明による場合の方が大きく、上記シート抵抗の分布
を適宜与えることにより上記比Ｒ２３／ Ｒ２２（ｉ−
１とさせることができる。Since the heating element has the sheet resistance distribution as described above, at one bending part of the resistor 21 as shown in FIG. 2, the starting point 22-1 of the current path 22 passing inside the bending part
The resistance value R22 per unit width light from to the end point 22-2,
The following relationship fcr+- is maintained regarding the resistance value R23 per unit width of light from the starting point 23-1 to the ending point 23-2 of the current path B passing outside the bent portion. That is, in any given path, the resistance value per unit width of the path is given by the following equation, so compared to the case where the conventional resistor has a uniform sheet resistance, the path resistance value ratio R23/ R22 is
The ratio R23/R22(i-
1.
従って、上記抵抗体の屈曲部における、電流密度の、該
屈曲部内側への集中は緩和さｔ１上記シート抵抗分布を
適宜与えることにより、上記抵抗体内における電流密度
を均一に分布させることも可能となる。Therefore, concentration of the current density inside the bent portion of the resistor is alleviated.t1 By appropriately providing the sheet resistance distribution, it is also possible to uniformly distribute the current density in the resistor. Become.
以上、本発明によるサーマルヘッドの発熱体の一実施例
について説明したが、次に、該発熱体を構成する屈曲部
を有する抵抗体に上述のシート抵抗分布を賦与するため
の方法について、実施例をもって説明する。An embodiment of the heating element of a thermal head according to the present invention has been described above.Next, an embodiment of a method for imparting the above-mentioned sheet resistance distribution to a resistor having a bent portion constituting the heating element will be described. Let me explain.
第３図は、サーマルヘッドの発熱体付近の断面図であり
、３１はアルミナセラミック基板、３２はグレーズ層、
３３は抵抗体、あは電極、３５は保護層である。抵抗体
３３は、薄膜で形成さ−ｎた抵抗体層を第４図に示すよ
うな平面形状に写真蝕刻でパターニングし形成さｎる。FIG. 3 is a cross-sectional view of the vicinity of the heating element of the thermal head, where 31 is an alumina ceramic substrate, 32 is a glaze layer,
33 is a resistor, A is an electrode, and 35 is a protective layer. The resistor 33 is formed by patterning a resistor layer formed of a thin film into a planar shape as shown in FIG. 4 by photolithography.
上記抵抗体おは該パターニング工程完了の時点において
均一なシート抵抗分布を有する。上記抵抗体のバターニ
ング工程の後、電極３４を、上述の同様な薄膜形成、バ
ターニングの工程で形成する。該工程の後、上記抵抗体
３３の両端に接続さｎ７’ｃ電極３４より電力パルスを
上記抵抗体３３に印加せしめる。該電力パルスの印加に
より、上記抵抗体おけ、ジュール熱を発生し該ジュール
熱による酸化等によりシート抵抗が増加する。該シート
抵抗の増加は、電流の集中しやすい、即ち上記ジュール
熱の発生量の多い抵抗体３３の屈曲部の内側が際立って
大きく、該屈曲部の外側に向うにつｎ小さくなる。上記
シート抵抗の増力口は、上記屈曲部以外の抵抗体部分に
も見らｎ１上記屈曲部の抵抗体幅と同等の抵抗体幅を有
する上記屈曲部以外の抵抗体部分においては、上記屈曲
部内側より小さく、上記屈曲部外側より大きなシ−ト抵
抗増加がある。The resistor has a uniform sheet resistance distribution upon completion of the patterning process. After the resistor patterning step, the electrode 34 is formed by the same thin film formation and patterning steps described above. After this step, a power pulse is applied to the resistor 33 from the n7'c electrodes 34 connected to both ends of the resistor 33. By applying the power pulse, Joule heat is generated in the resistor, and the sheet resistance increases due to oxidation and the like caused by the Joule heat. The increase in sheet resistance is significantly greater inside the bent portion of the resistor 33 where current tends to concentrate, that is, where a large amount of Joule heat is generated, and decreases toward the outside of the bent portion. The amplification port of the sheet resistance is also found in the resistor portion other than the bent portion. There is an increase in sheet resistance that is smaller than the inside and larger than the outside of the bend.
前記電力パルスをさらに印加しつづけることにより、電
流密度分布即ち発熱量分布に応じたシート抵抗分布の変
化が続き、該シート抵抗分布の変化に応じて上記電流密
度分布が変化する。該電流密度分布とシート抵抗分布の
相互の変化により、電流密度分布即ち発熱量分布は＃記
抵抗体内で均一化してくる。By continuing to apply the power pulse further, the sheet resistance distribution continues to change in accordance with the current density distribution, that is, the calorific value distribution, and the current density distribution changes in accordance with the change in the sheet resistance distribution. Due to the mutual change in the current density distribution and the sheet resistance distribution, the current density distribution, that is, the calorific value distribution becomes uniform within the resistor #.
上述の操作を、サーマルヘッドが複数の発熱体を有する
ものであわば、該発熱体各々に対して行なう。この後、
前記保護層３５を上記発熱体上に形成するのである。上
記シート抵抗分布ヲ変える操作は、上記保護層３５を形
成する工程より前に行なうことがより好ましい。何故な
ら、上記保護層間は、抵抗体３３を酸化や摺動摩耗から
保護するために形成するものであり、該酸化保護機能が
、上記抵抗体のシート抵抗分布を変えるための熱酸化現
象を防げる結果になるからである。さらに、上記保護層
３５は熱ひずみによる欠陥をクラック特の形で生じ易く
、従って、上記抵抗体内の発熱分布を均一にした後に、
保護層あを形成することが本発明の目的を達成になるも
のである。If the thermal head has a plurality of heating elements, the above-described operation is performed for each heating element. After this,
The protective layer 35 is formed on the heating element. It is more preferable that the operation of changing the sheet resistance distribution is performed before the step of forming the protective layer 35. This is because the protective layer is formed to protect the resistor 33 from oxidation and sliding wear, and the oxidation protection function prevents thermal oxidation phenomena that change the sheet resistance distribution of the resistor. Because it will result. Furthermore, the protective layer 35 is susceptible to defects in the form of cracks due to thermal strain, so after making the heat distribution within the resistor uniform,
Forming a protective layer achieves the object of the present invention.
さらに、上述のシート抵抗分布を変える操作は発熱体の
有する固有抵抗値を変える操作でもあるため、サーマル
ヘッドが複数の発熱体を有する場合、該複数の発牒体の
固有抵抗値を均一に揃えるという操作を同時に実行する
ことが可能である。Furthermore, since the above-mentioned operation of changing the sheet resistance distribution is also an operation of changing the specific resistance value of the heating element, if the thermal head has multiple heating elements, the specific resistance values of the plurality of heating elements should be made uniform. It is possible to perform these operations simultaneously.
即ち、前述の説明より、抵抗体内の電流密度分布とシー
ト抵抗分布の相互の変化により、発熱量分布の均一化を
達成するわけであるが、該均一化が達成さｎた後は、前
記電力パルスを印加しつづけても、シート抵抗分布の傾
向は変わらず、上記抵抗体内各部のシート抵抗の絶対値
が全体的に増加シフトするだけである。従って、発熱量
分布を均一化した後、固有抵抗値の低い発熱体にはより
数の多い電力パルスを印加しつづけることによって、発
熱量分布を均一に保持したまま、上記固有抵抗値をある
目標値に近づけることが可能である。即ち、サーマルヘ
ッドの複数の発熱体の固有抵抗値を均一に揃えることが
可能である。That is, from the above explanation, the uniformity of the calorific value distribution is achieved by mutual changes in the current density distribution and sheet resistance distribution within the resistor, but after the uniformity is achieved, the power Even if the pulse is continued to be applied, the tendency of the sheet resistance distribution does not change, and the absolute value of the sheet resistance in each part of the resistor body simply increases and shifts as a whole. Therefore, after making the heat generation distribution uniform, by continuing to apply a larger number of power pulses to the heating element with a low specific resistance value, the above specific resistance value can be adjusted to a certain target while keeping the heat generation distribution uniform. It is possible to get close to the value. That is, it is possible to make the specific resistance values of the plurality of heating elements of the thermal head uniform.
以上述べたように、抵抗体内のシート抵抗分布の調整、
即ち発熱量分布の均一化を行ない、また発熱体の固有抵
抗値の均一化を行なったサーマルヘッドにおいては、
１゜発熱体が電力駆動さｎる時、該発熱体内で発熱が特
定箇所に集中することがないため、該発熱体や、該発熱
体の上層の保護層に劣化が起こりにくい。即ち寿命が向
上する。As mentioned above, adjusting the sheet resistance distribution inside the resistor,
In other words, in a thermal head in which the distribution of heat generation is made uniform and the specific resistance value of the heating element is made uniform, when the heating element is driven by electric power for 1°, the heat generated in the heating element is concentrated at a specific point. Therefore, the heating element and the protective layer above the heating element are less likely to deteriorate. In other words, the lifespan is improved.
２、発熱体内の発熱分布が均一なため、記録さｎるドツ
トの濃度ムラが少ない。即ち、記録品位が向上する。2. Because the heat distribution within the heating element is uniform, there is little density unevenness in the recorded dots. That is, recording quality is improved.
３、発熱体の固有抵抗値が均一化さしているため、複数
の発熱体間での記録濃度ムラがなく、低電力で均一な記
録濃度が得らｆる。即ち、記録エネルギーの高効率化が
実現すると伴に、階調記録を高品位化を容易に実現する
。3. Since the specific resistance values of the heating elements are uniform, there is no unevenness in recording density among the plurality of heating elements, and uniform recording density can be obtained with low power. In other words, it is possible to realize high efficiency of recording energy and to easily achieve high quality gradation recording.
等の効果がある。There are other effects.
以上述べた如く本発明によｎば、サーマルヘッドの長寿
命化、高品位記録、階調記録への容易な応用を実現する
ものである。As described above, according to the present invention, it is possible to extend the life of a thermal head and easily apply it to high-quality recording and gradation recording.
第１図は、本発明の一笑施例のサーマルヘッドにおける
発熱体の要部平面図で、シート抵抗の分布を表わす図、
第２図は、抵抗体の屈曲部における電流径路ｔｌ−表わ
す平面図、第３図は、サーマルヘッドの発熱体周囲の断
面図、第４図は、発熱体を構成する屈曲した抵抗体の平
面図、第５図は、従来のサーマルヘッドにおける発熱体
を構成する屈曲した抵抗体を′ＩＮ、ｔＬる電流の径路
を衣わす平面図である。
ｌ、２１ 抵抗体
２ 等シート抵抗線
２２ 、２３ 電流径路
以上
出願人 セイコー電子工業株式会社FIG. 1 is a plan view of a main part of a heating element in a thermal head according to an embodiment of the present invention, and is a diagram showing the distribution of sheet resistance.
Fig. 2 is a plan view showing the current path tl at the bent portion of the resistor, Fig. 3 is a sectional view of the area around the heating element of the thermal head, and Fig. 4 is a plane view of the bent resistor forming the heating element. FIG. 5 is a plan view showing the path of a current flowing through a bent resistor constituting a heating element in a conventional thermal head. l, 21 Resistor 2 Equal sheet resistance wire 22, 23 Current path and above Applicant Seiko Electronics Co., Ltd.
Claims (4)
マルヘッドにおいて、該抵抗体の屈曲部におけるシート
抵抗が、該屈曲の外側から内側に向けて高いことを特徴
とするサーマルヘッド。(1) A thermal head in which the heating element is composed of a resistor having a bent portion, wherein the sheet resistance at the bent portion of the resistor increases from the outside to the inside of the bend.
マルヘッドの製造方法であって、上記発熱体の自己発生
ジュール熱によって、上記抵抗体のシート抵抗の分布を
変える工程を有することを特徴とするサーマルヘッドの
製造方法。(2) A method for manufacturing a thermal head in which the zero heating element is a resistor having a bent portion, the method comprising the step of changing the sheet resistance distribution of the resistor by self-generated Joule heat of the heating element. The manufacturing method of the featured thermal head.
体を構成する抵抗体のシート抵抗の分布を変える工程が
、上記発熱体の上層に形成さするべき保護層形成の工程
より前にあることを特徴とする特許請求の範囲第２項記
載のサーマルヘッドの製造方法。(3) The step of changing the sheet resistance distribution of the resistor constituting the heating element by the self-generated Joule heat of the heating element is performed before the step of forming the protective layer to be formed on the upper layer of the heating element. A method of manufacturing a thermal head according to claim 2, characterized in that:
体を構成する抵抗体のシート抵抗の分布ｔ−変える工程
が、同時に、上記発熱体の固有抵抗値を調整する工程で
あることを特徴とする特許請求の範囲第２項記載のサー
マルヘッドの製造方法。(4). A patent claim characterized in that the step of changing the sheet resistance distribution t- of a resistor constituting the heating element by self-generated Joule heat of the heating element is simultaneously a step of adjusting the specific resistance value of the heating element. A method for manufacturing a thermal head according to item 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59055731A JPS60199672A (en) | 1984-03-23 | 1984-03-23 | Thermal head and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59055731A JPS60199672A (en) | 1984-03-23 | 1984-03-23 | Thermal head and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60199672A true JPS60199672A (en) | 1985-10-09 |
Family
ID=13006995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59055731A Pending JPS60199672A (en) | 1984-03-23 | 1984-03-23 | Thermal head and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60199672A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05228011A (en) * | 1992-02-21 | 1993-09-07 | Terukiyo Kitazawa | Antitheft device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5836474A (en) * | 1981-08-26 | 1983-03-03 | Yokogawa Hokushin Electric Corp | Thermal head |
| JPS58211470A (en) * | 1982-06-03 | 1983-12-08 | Mitsubishi Electric Corp | Thermal head |
-
1984
- 1984-03-23 JP JP59055731A patent/JPS60199672A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5836474A (en) * | 1981-08-26 | 1983-03-03 | Yokogawa Hokushin Electric Corp | Thermal head |
| JPS58211470A (en) * | 1982-06-03 | 1983-12-08 | Mitsubishi Electric Corp | Thermal head |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05228011A (en) * | 1992-02-21 | 1993-09-07 | Terukiyo Kitazawa | Antitheft device |
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